chore(agent): fix clippy needless_return for non-linux process collection

display welcome message on first run when a profile file is not created and remote server not specified.

.githooks/pre-commit

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+echo "[pre-commit] Running cargo fmt --all" >&2
+
+if ! command -v cargo >/dev/null 2>&1; then
+  echo "[pre-commit] cargo not found in PATH" >&2
+  exit 1
+fi
+
+cargo fmt --all
+
+# Stage any Rust files that were reformatted
+changed=$(git diff --name-only --diff-filter=M | grep -E '\\.rs$' || true)
+if [ -n "$changed" ]; then
+  echo "$changed" | xargs git add
+  echo "[pre-commit] Added formatted files" >&2
+fi
+
+# Fail if further diffs remain (shouldn't happen normally)
+unfmt=$(git diff --name-only --diff-filter=M | grep -E '\\.rs$' || true)
+if [ -n "$unfmt" ]; then
+  echo "[pre-commit] Some Rust files still differ after formatting:" >&2
+  echo "$unfmt" >&2
+  exit 1
+fi
+
+exit 0

.github/workflows/ci.yml

@@ -0,0 +1,129 @@
+name: CI
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy, rustfmt
+      - name: Install system dependencies (Linux)
+        if: matrix.os == 'ubuntu-latest'
+        run: sudo apt-get update && sudo apt-get install -y libdrm-dev libdrm-amdgpu1
+      - name: Cargo fmt
+        run: cargo fmt --all -- --check
+      - name: Clippy
+        run: cargo clippy --all-targets --all-features -- -D warnings
+      - name: Build (release)
+        run: cargo build --release --workspace
+
+      - name: "Linux: start agent and run WS probe"
+        if: matrix.os == 'ubuntu-latest'
+        shell: bash
+        run: |
+          set -euo pipefail
+          RUST_LOG=info SOCKTOP_ENABLE_SSL=0 SOCKTOP_AGENT_GPU=0 SOCKTOP_AGENT_TEMP=0 ./target/release/socktop_agent -p 3000 > agent.log 2>&1 &
+          AGENT_PID=$!
+          for i in {1..60}; do
+            if curl -fsS http://127.0.0.1:3000/healthz >/dev/null; then break; fi
+            sleep 1
+          done
+          if ! curl -fsS http://127.0.0.1:3000/healthz >/dev/null; then
+            echo "--- agent.log (tail) ---"
+            tail -n 200 agent.log || true
+            (command -v ss >/dev/null && ss -ltnp || netstat -ltnp) || true
+            kill $AGENT_PID || true
+            exit 1
+          fi
+          SOCKTOP_WS=ws://127.0.0.1:3000/ws cargo test -p socktop --test ws_probe -- --nocapture
+          kill $AGENT_PID || true
+
+      - name: "Windows: start agent and run WS probe"
+        if: matrix.os == 'windows-latest'
+        shell: pwsh
+        run: |
+          $env:SOCKTOP_ENABLE_SSL = "0"
+          $env:SOCKTOP_AGENT_GPU = "0"
+          $env:SOCKTOP_AGENT_TEMP = "0"
+          $out = Join-Path $PWD "agent.out.txt"
+          $err = Join-Path $PWD "agent.err.txt"
+          $p = Start-Process -FilePath "${PWD}\target\release\socktop_agent.exe" -ArgumentList "-p 3000" -RedirectStandardOutput $out -RedirectStandardError $err -PassThru -NoNewWindow
+          $ready = $false
+          for ($i = 0; $i -lt 60; $i++) {
+            $pinfo = New-Object System.Diagnostics.ProcessStartInfo
+            $pinfo.FileName = "curl.exe"
+            $pinfo.Arguments = "-fsS http://127.0.0.1:3000/healthz"
+            $pinfo.RedirectStandardOutput = $true
+            $pinfo.RedirectStandardError = $true
+            $pinfo.UseShellExecute = $false
+            $proc = [System.Diagnostics.Process]::Start($pinfo)
+            $proc.WaitForExit()
+            if ($proc.ExitCode -eq 0) { $ready = $true; break }
+            Start-Sleep -Seconds 1
+          }
+          if (-not $ready) {
+            Write-Warning "TCP connect to (127.0.0.1 : 3000) failed"
+            if (Test-Path $out) { Write-Host "--- agent.out (full) ---"; Get-Content $out }
+            if (Test-Path $err) { Write-Host "--- agent.err (full) ---"; Get-Content $err }
+            Write-Host "--- netstat ---"
+            netstat -ano | Select-String ":3000" | ForEach-Object { $_.Line }
+            if ($p -and !$p.HasExited) { Stop-Process -Id $p.Id -Force -ErrorAction SilentlyContinue }
+            throw "agent did not become ready"
+          }
+          $env:SOCKTOP_WS = "ws://127.0.0.1:3000/ws"
+          try {
+            cargo test -p socktop --test ws_probe -- --nocapture
+          } finally {
+            if ($p -and !$p.HasExited) { Stop-Process -Id $p.Id -Force -ErrorAction SilentlyContinue }
+          }
+
+      - name: Smoke test (client --help)
+        run: cargo run -p socktop -- --help
+
+      - name: Package artifacts (Linux)
+        if: matrix.os == 'ubuntu-latest'
+        shell: bash
+        run: |
+          set -e
+          mkdir -p dist
+          cp target/release/socktop dist/
+          cp target/release/socktop_agent dist/
+          tar czf socktop-${{ matrix.os }}.tar.gz -C dist .
+
+      - name: Package artifacts (Windows)
+        if: matrix.os == 'windows-latest'
+        shell: pwsh
+        run: |
+          New-Item -ItemType Directory -Force -Path dist | Out-Null
+          Copy-Item target\release\socktop.exe dist\
+          Copy-Item target\release\socktop_agent.exe dist\
+          Compress-Archive -Path dist\* -DestinationPath socktop-${{ matrix.os }}.zip -Force
+
+      - name: Upload build artifacts (ephemeral)
+        uses: actions/upload-artifact@v4
+        with:
+          name: socktop-${{ matrix.os }}
+          path: |
+            *.tar.gz
+            *.zip
+
+      - name: Upload to rolling GitHub Release (main only)
+        if: github.ref == 'refs/heads/main' && github.event_name == 'push'
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: latest
+          name: Latest build
+          prerelease: true
+          draft: false
+          files: |
+            *.tar.gz
+            *.zip
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -0,0 +1,2 @@
+/target
+.vscode/

APT_REPO_SUMMARY.md

@@ -1,423 +0,0 @@
-# APT Repository Setup Summary
-
-## 🎉 What You Now Have
-
-You now have a complete system for creating and hosting your own APT repository for socktop packages, **without needing a sponsor or official Debian/Ubuntu approval**.
-
-## 📁 Files Created
-
-### Scripts (in `scripts/`)
-- **`init-apt-repo.sh`** - Initializes the APT repository directory structure
-- **`add-package-to-repo.sh`** - Adds .deb packages to the repository and generates metadata
-- **`sign-apt-repo.sh`** - Signs the repository with your GPG key
-- **`setup-apt-repo.sh`** - All-in-one interactive wizard to set everything up
-
-### Documentation
-- **`QUICK_START_APT_REPO.md`** - Quick start guide (< 10 minutes)
-- **`docs/APT_REPOSITORY.md`** - Comprehensive 600+ line guide covering everything
-- **`APT_REPO_SUMMARY.md`** - This file
-
-### GitHub Actions
-- **`.github/workflows/publish-apt-repo.yml`** - Automated building, signing, and publishing
-
-## 🚀 Quick Start (Choose One)
-
-### Option 1: Interactive Setup (Recommended for First Time)
-
-Run the setup wizard:
-
-```bash
-./scripts/setup-apt-repo.sh
-```
-
-This walks you through:
-1. ✅ Checking prerequisites
-2. 🔑 Setting up GPG key
-3. 📦 Finding/building packages
-4. 📝 Creating repository structure
-5. ✍️ Signing the repository
-6. 📋 Next steps to publish to gh-pages
-
-### Option 2: Manual Step-by-Step
-
-```bash
-# 1. Initialize
-./scripts/init-apt-repo.sh
-
-# 2. Build packages
-cargo deb --package socktop
-cargo deb --package socktop_agent
-
-# 3. Add packages
-./scripts/add-package-to-repo.sh target/debian/socktop_*.deb
-./scripts/add-package-to-repo.sh target/debian/socktop-agent_*.deb
-
-# 4. Sign (replace YOUR-KEY-ID)
-./scripts/sign-apt-repo.sh apt-repo stable YOUR-KEY-ID
-
-# 5. Update URLs
-sed -i 's/YOUR-USERNAME/your-github-username/g' apt-repo/*.{md,html}
-
-# 6. Publish to gh-pages (see below)
-```
-
-### Option 3: Fully Automated (After Initial Setup)
-
-Once gh-pages branch exists, just tag releases:
-
-```bash
-git tag v1.50.0
-git push --tags
-
-# GitHub Actions will:
-# - Build packages for AMD64 and ARM64
-# - Update APT repository
-# - Sign with your GPG key
-# - Push to gh-pages branch automatically
-```
-
-## 📤 Publishing to GitHub Pages (gh-pages branch)
-
-**Why gh-pages branch?**
-- ✅ Keeps main branch clean (source code only)
-- ✅ Separate branch for published content  
-- ✅ GitHub Actions can auto-update it
-- ✅ You can customize the landing page
-
-**Initial Setup:**
-```bash
-# Create gh-pages branch
-git checkout --orphan gh-pages
-git rm -rf .
-
-# Copy apt-repo CONTENTS to root (not the folder!)
-cp -r apt-repo/* .
-rm -rf apt-repo
-
-# Commit and push
-git add .
-git commit -m "Initialize APT repository"
-git push -u origin gh-pages
-
-# Return to main
-git checkout main
-```
-
-**Enable in GitHub:**
-1. Settings → Pages
-2. Source: **gh-pages** → **/ (root)**
-3. Save
-
-Your repo will be at: `https://your-username.github.io/socktop/`
-
-**Note:** GitHub Pages only allows `/` (root) or `/docs`. Since we use gh-pages branch, contents go in the root of that branch.
-
-See `SETUP_GITHUB_PAGES.md` for detailed step-by-step instructions.
-
-### Alternative: Self-Hosted Server
-
-Copy `apt-repo/` contents to your web server:
-```bash
-rsync -avz apt-repo/ user@example.com:/var/www/apt/
-```
-
-Configure Apache/Nginx to serve the directory. See `docs/APT_REPOSITORY.md` for details.
-
-## 🤖 GitHub Actions Automation
-
-### Required Secrets
-
-Add these in GitHub Settings → Secrets → Actions:
-
-1. **GPG_PRIVATE_KEY**
-   ```bash
-   gpg --armor --export-secret-key YOUR-KEY-ID
-   # Copy entire output including BEGIN/END lines
-   ```
-
-2. **GPG_KEY_ID**
-   ```bash
-   gpg --list-secret-keys --keyid-format LONG
-   # Use the ID after "rsa4096/"
-   ```
-
-3. **GPG_PASSPHRASE**
-   ```bash
-   # Your GPG passphrase (leave empty if no passphrase)
-   ```
-
-### Triggers
-
-The workflow runs on:
-- **Version tags**: `git tag v1.50.0 && git push --tags`
-- **Manual dispatch**: Actions tab → "Publish APT Repository" → Run workflow
-
-### What It Does
-
-1. ✅ Builds packages for AMD64 and ARM64
-2. ✅ Initializes or updates APT repository
-3. ✅ Generates Packages files and metadata
-4. ✅ Signs with your GPG key
-5. ✅ Commits and pushes to gh-pages branch
-6. ✅ Creates GitHub Release with artifacts
-7. ✅ Generates summary with installation instructions
-
-## 👥 User Installation
-
-Once published, users install with:
-
-```bash
-# Add repository
-curl -fsSL https://your-username.github.io/socktop/KEY.gpg | \
-    sudo gpg --dearmor -o /usr/share/keyrings/socktop-archive-keyring.gpg
-
-echo "deb [signed-by=/usr/share/keyrings/socktop-archive-keyring.gpg] https://your-username.github.io/socktop stable main" | \
-    sudo tee /etc/apt/sources.list.d/socktop.list
-
-# Install
-sudo apt update
-sudo apt install socktop socktop-agent
-
-# The agent service is automatically installed and configured
-sudo systemctl enable --now socktop-agent
-```
-
-## 🔧 Maintenance
-
-### Release New Version (Automated)
-
-```bash
-# Update version in Cargo.toml, commit changes
-git add . && git commit -m "Bump version to 1.51.0"
-git tag v1.51.0
-git push origin main --tags
-
-# GitHub Actions automatically:
-# - Builds packages for AMD64 and ARM64
-# - Updates apt-repo
-# - Signs with GPG
-# - Pushes to gh-pages branch
-```
-
-### Manual Update (if needed)
-
-```bash
-# On main branch
-cargo deb --package socktop
-./scripts/add-package-to-repo.sh target/debian/socktop_*.deb
-./scripts/sign-apt-repo.sh
-
-# Switch to gh-pages and update
-git checkout gh-pages
-cp -r apt-repo/* .
-git add . && git commit -m "Release v1.51.0" && git push
-git checkout main
-```
-
-### Remove Old Versions
-
-```bash
-# On gh-pages branch
-git checkout gh-pages
-rm pool/main/socktop_1.50.0_*.deb
-# Regenerate metadata (re-add remaining packages)
-git add . && git commit -m "Remove old versions" && git push
-git checkout main
-```
-
-## 🎯 Key Benefits
-
-✅ **No sponsor needed** - Host your own repository  
-✅ **Full control** - You decide when to release  
-✅ **Free hosting** - GitHub Pages at no cost  
-✅ **Automated** - GitHub Actions does the work  
-✅ **Professional** - Just like official repos  
-✅ **Multi-arch** - AMD64, ARM64 support built-in  
-✅ **Secure** - GPG signed packages  
-✅ **Easy updates** - Users get updates via `apt upgrade`  
-
-## 📊 Repository Structure
-
-```
-apt-repo/
-├── dists/
-│   └── stable/
-│       ├── Release              # Main metadata (checksums)
-│       ├── Release.gpg          # Detached signature
-│       ├── InRelease            # Clearsigned release
-│       └── main/
-│           ├── binary-amd64/
-│           │   ├── Packages     # Package list
-│           │   ├── Packages.gz  # Compressed
-│           │   └── Release      # Component metadata
-│           ├── binary-arm64/
-│           └── binary-armhf/
-├── pool/
-│   └── main/
-│       ├── socktop_1.50.0_amd64.deb
-│       ├── socktop-agent_1.50.1_amd64.deb
-│       ├── socktop_1.50.0_arm64.deb
-│       └── socktop-agent_1.50.1_arm64.deb
-├── KEY.gpg                      # Public GPG key
-├── README.md                    # Repository info
-├── index.html                   # Web interface
-└── packages.html                # Package listing
-```
-
-## 🔑 GPG Key Management
-
-### Create New Key
-
-```bash
-gpg --full-generate-key
-# Choose RSA 4096, no expiration (or 2 years)
-```
-
-### Export Keys
-
-```bash
-# Public key (for users)
-gpg --armor --export YOUR-KEY-ID > KEY.gpg
-
-# Private key (for GitHub Secrets)
-gpg --armor --export-secret-key YOUR-KEY-ID
-```
-
-### Backup Keys
-
-```bash
-# Backup to safe location
-gpg --export-secret-keys YOUR-KEY-ID > gpg-private-backup.key
-gpg --export YOUR-KEY-ID > gpg-public-backup.key
-```
-
-### Key Rotation
-
-If your key expires or is compromised:
-```bash
-./scripts/sign-apt-repo.sh apt-repo stable NEW-KEY-ID
-gpg --armor --export NEW-KEY-ID > apt-repo/KEY.gpg
-# Users need to re-import the key
-```
-
-## 🐛 Troubleshooting
-
-### "Repository not signed"
-```bash
-./scripts/sign-apt-repo.sh apt-repo stable YOUR-KEY-ID
-ls apt-repo/dists/stable/Release*  # Should show 3 files
-```
-
-### "Package not found"
-```bash
-cd apt-repo
-dpkg-scanpackages --arch amd64 pool/main /dev/null > dists/stable/main/binary-amd64/Packages
-gzip -9 -k -f dists/stable/main/binary-amd64/Packages
-cd ..
-./scripts/sign-apt-repo.sh
-```
-
-### "404 Not Found" on GitHub Pages
-- Wait 2-3 minutes after pushing
-- Check Settings → Pages is enabled
-- Verify source branch/directory
-
-### GitHub Actions not signing
-- Check all 3 secrets are set correctly
-- GPG_PRIVATE_KEY must include BEGIN/END lines
-- Test signing locally first
-
-## 📚 Documentation
-
-| File | Purpose | Length |
-|------|---------|--------|
-| `QUICK_START_APT_REPO.md` | Get started in < 10 minutes | Quick |
-| `SETUP_GITHUB_PAGES.md` | Detailed gh-pages setup guide | Step-by-step |
-| `docs/APT_REPOSITORY.md` | Complete guide with all options | Comprehensive |
-| `docs/DEBIAN_PACKAGING.md` | How .deb packages are built | Technical |
-| `DEBIAN_PACKAGING_SUMMARY.md` | Overview of packaging work | Summary |
-| `APT_REPO_SUMMARY.md` | This file | Overview |
-
-## 🎓 Learning Path
-
-1. **Start here**: `QUICK_START_APT_REPO.md` (10 min)
-2. **Set up**: Run `./scripts/setup-apt-repo.sh` (15 min)
-3. **Publish**: Follow `SETUP_GITHUB_PAGES.md` (5 min)
-4. **Automate**: Set up GitHub Actions secrets (10 min)
-5. **Advanced**: Read `docs/APT_REPOSITORY.md` as needed
-
-## 🚦 Next Steps
-
-Choose your path:
-
-### Just Getting Started?
-1. ✅ Read `QUICK_START_APT_REPO.md`
-2. ✅ Run `./scripts/setup-apt-repo.sh`
-3. ✅ Follow `SETUP_GITHUB_PAGES.md` to publish
-4. ✅ Test installation on a VM
-
-### Want Automation?
-1. ✅ Generate/export GPG key
-2. ✅ Add GitHub Secrets
-3. ✅ Tag a release: `git tag v1.50.0 && git push --tags`
-4. ✅ Watch GitHub Actions magic happen
-
-### Want to Understand Everything?
-1. ✅ Read `docs/APT_REPOSITORY.md` (comprehensive)
-2. ✅ Study the scripts in `scripts/`
-3. ✅ Examine `.github/workflows/publish-apt-repo.yml`
-4. ✅ Learn about Debian repository format
-
-### Ready for Production?
-1. ✅ Set up monitoring/analytics
-2. ✅ Create PPA for Ubuntu (Launchpad)
-3. ✅ Apply to Debian mentors for official inclusion
-4. ✅ Set up repository mirrors
-5. ✅ Document best practices for users
-
-## 🌟 Success Criteria
-
-You'll know you're successful when:
-
-- [ ] Users can `apt install socktop`
-- [ ] Updates work with `apt upgrade`
-- [ ] Multiple architectures supported
-- [ ] Repository is GPG signed
-- [ ] GitHub Actions publishes automatically
-- [ ] Installation instructions in README
-- [ ] Zero sponsor or approval needed
-
-## 💡 Pro Tips
-
-1. **Test first**: Always test on a fresh VM before publishing
-2. **Keep versions**: Don't delete old .deb files immediately
-3. **Backup GPG key**: Store it safely offline
-4. **Monitor downloads**: Use GitHub Insights or server logs
-5. **Document everything**: Help users troubleshoot
-6. **Version consistently**: Use semantic versioning
-7. **Sign always**: Never publish unsigned repositories
-
-## 🔗 Resources
-
-- [Debian Repository Format](https://wiki.debian.org/DebianRepository/Format)
-- [GitHub Pages Docs](https://docs.github.com/en/pages)
-- [cargo-deb](https://github.com/kornelski/cargo-deb)
-- [Ubuntu PPA Guide](https://help.launchpad.net/Packaging/PPA)
-- [Debian Mentors](https://mentors.debian.net/)
-
-## 🎊 Congratulations!
-
-You now have everything you need to:
-- ✅ Create your own APT repository
-- ✅ Host it for free on GitHub Pages
-- ✅ Automate the entire process
-- ✅ Distribute packages professionally
-- ✅ Provide easy installation for users
-
-**No sponsor required. No approval needed. You're in control!** 🚀
-
----
-
-**Questions?** Check the docs or open an issue.
-
-**Ready to publish?** Run `./scripts/setup-apt-repo.sh` and follow the wizard!

Cargo.toml

@@ -0,0 +1,43 @@
+[workspace]
+resolver = "2"
+members = [
+    "socktop",
+    "socktop_agent"
+]
+
+[workspace.dependencies]
+# async + streams
+tokio = { version = "1", features = ["full"] }
+futures-util = "0.3"
+anyhow = "1.0"
+
+# websocket
+tokio-tungstenite = { version = "0.24", features = ["__rustls-tls", "connect"] }
+url = "2.5"
+
+# JSON + error handling
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+
+# system stats (align across crates)
+sysinfo = "0.37"
+
+# CLI UI
+ratatui = "0.28"
+crossterm = "0.27"
+
+
+# web server (remote-agent)
+axum = { version = "0.7", features = ["ws"] }
+
+# protobuf
+prost = "0.13"
+dirs-next = "2"
+
+[profile.release]
+# Favor smaller, simpler binaries with good runtime perf
+lto = "thin"
+codegen-units = 1
+panic = "abort"
+opt-level = 3
+strip = "symbols"

GETTING_STARTED_NOW.md

@@ -1,109 +0,0 @@
-# 🚀 Get Your APT Repository Live in 5 Minutes
-
-## You're Here Because...
-
-You want to publish socktop packages via APT, but GitHub Pages won't let you select `apt-repo/` folder. Here's why and how to fix it:
-
-**The Issue:** GitHub Pages only serves from `/` (root) or `/docs`, not custom folders like `/apt-repo`.
-
-**The Solution:** Use a `gh-pages` branch where `apt-repo` contents go in the root.
-
-## Quick Setup (5 Steps)
-
-### 1. Create apt-repo locally (if you haven't)
-
-```bash
-./scripts/setup-apt-repo.sh
-```
-
-This creates `apt-repo/` with your packages and signs them.
-
-### 2. Create gh-pages branch
-
-```bash
-git checkout --orphan gh-pages
-git rm -rf .
-```
-
-### 3. Copy apt-repo to root
-
-```bash
-cp -r apt-repo/* .
-rm -rf apt-repo
-ls
-# You should see: dists/ pool/ KEY.gpg index.html README.md
-```
-
-### 4. Push to GitHub
-
-```bash
-git add .
-git commit -m "Initialize APT repository"
-git push -u origin gh-pages
-git checkout main
-```
-
-### 5. Enable GitHub Pages
-
-1. Go to: **Settings → Pages**
-2. Source: **gh-pages** → **/ (root)**
-3. Click **Save**
-
-**Done!** ✅ Your repo will be live at `https://your-username.github.io/socktop/` in 1-2 minutes.
-
-## Test It
-
-```bash
-curl -I https://your-username.github.io/socktop/KEY.gpg
-# Should return: HTTP/2 200
-```
-
-## Install It (On Any Debian/Ubuntu System)
-
-```bash
-curl -fsSL https://your-username.github.io/socktop/KEY.gpg | \
-    sudo gpg --dearmor -o /usr/share/keyrings/socktop-archive-keyring.gpg
-
-echo "deb [signed-by=/usr/share/keyrings/socktop-archive-keyring.gpg] https://your-username.github.io/socktop stable main" | \
-    sudo tee /etc/apt/sources.list.d/socktop.list
-
-sudo apt update
-sudo apt install socktop socktop-agent
-```
-
-## What's Next?
-
-### Now (Optional):
-- Customize `index.html` on gh-pages for a nice landing page
-- Add installation instructions to your main README
-
-### Later:
-- Set up GitHub Actions automation (see `QUICK_START_APT_REPO.md`)
-- Add more architectures (ARM64, ARMv7)
-
-## Understanding the Setup
-
-```
-main branch:               gh-pages branch:
-├── src/                   ├── dists/
-├── Cargo.toml             ├── pool/
-├── scripts/               ├── KEY.gpg
-└── apt-repo/ (local)      └── index.html ← GitHub Pages serves this
-                           
-Work here ↑                Published here ↑
-```
-
-- **main**: Your development work
-- **gh-pages**: What users see/download
-- **apt-repo/**: Local folder (ignored in git, see `.gitignore`)
-
-## Need More Help?
-
-- **Quick start**: `QUICK_START_APT_REPO.md`
-- **Detailed setup**: `SETUP_GITHUB_PAGES.md`
-- **Why gh-pages?**: `WHY_GHPAGES_BRANCH.md`
-- **Full guide**: `docs/APT_REPOSITORY.md`
-
----
-
-**You got this!** 🎉

KEY.gpg

@@ -1,42 +0,0 @@
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QUICK_START_APT_REPO.md

@@ -1,221 +0,0 @@
-# Quick Start: Setting Up Your socktop APT Repository
-
-This guide will get your APT repository up and running in **under 10 minutes**.
-
-## Prerequisites
-
-- [ ] Debian packages built (or use GitHub Actions to build them)
-- [ ] GPG key for signing
-- [ ] GitHub repository with Pages enabled
-
-## Step 1: Create GPG Key (if needed)
-
-```bash
-# Generate a new key
-gpg --full-generate-key
-
-# Select:
-# - RSA and RSA (default)
-# - 4096 bits
-# - Key does not expire (or 2 years)
-# - Your name and email
-
-# Get your key ID
-gpg --list-secret-keys --keyid-format LONG
-# Look for the part after "rsa4096/" - that's your KEY-ID
-```
-
-## Step 2: Initialize Repository Locally
-
-```bash
-cd socktop
-
-# Create the repository structure
-./scripts/init-apt-repo.sh
-
-# Build packages (or download from GitHub Actions)
-cargo install cargo-deb
-cargo deb --package socktop
-cargo deb --package socktop_agent
-
-# Add packages to repository
-./scripts/add-package-to-repo.sh target/debian/socktop_*.deb
-./scripts/add-package-to-repo.sh target/debian/socktop-agent_*.deb
-
-# Sign the repository (replace YOUR-KEY-ID with actual key ID)
-./scripts/sign-apt-repo.sh apt-repo stable YOUR-KEY-ID
-
-# Update URLs with your GitHub username
-sed -i 's/YOUR-USERNAME/your-github-username/g' apt-repo/README.md apt-repo/index.html
-```
-
-## Step 3: Publish to GitHub Pages (gh-pages branch)
-
-```bash
-# Create gh-pages branch
-git checkout --orphan gh-pages
-git rm -rf .
-
-# Copy apt-repo CONTENTS to root (not the folder itself)
-cp -r apt-repo/* .
-rm -rf apt-repo
-
-# Commit and push
-git add .
-git commit -m "Initialize APT repository"
-git push -u origin gh-pages
-
-# Go back to main branch
-git checkout main
-```
-
-Then in GitHub:
-1. Go to **Settings → Pages**
-2. Source: **Deploy from a branch**
-3. Branch: **gh-pages** → **/ (root)** → **Save**
-
-Wait 1-2 minutes, then visit: `https://your-username.github.io/socktop/`
-
-## Step 4: Automate with GitHub Actions
-
-Add these secrets to your repository (Settings → Secrets → Actions):
-
-```bash
-# Export your private key
-gpg --armor --export-secret-key YOUR-KEY-ID
-
-# Copy the ENTIRE output and save as secret: GPG_PRIVATE_KEY
-```
-
-Add these three secrets:
-- **GPG_PRIVATE_KEY**: Your exported private key
-- **GPG_KEY_ID**: Your key ID (e.g., `ABC123DEF456`)
-- **GPG_PASSPHRASE**: Your key passphrase (leave empty if no passphrase)
-
-The workflow in `.github/workflows/publish-apt-repo.yml` will now:
-- Build packages for AMD64 and ARM64
-- Update the APT repository
-- Sign with your GPG key
-- Push to gh-pages automatically
-
-Trigger it by:
-- Creating a version tag: `git tag v1.50.0 && git push --tags`
-- Manual dispatch from GitHub Actions tab
-
-## Step 5: Test It
-
-On any Debian/Ubuntu system:
-
-```bash
-# Add your repository
-curl -fsSL https://your-username.github.io/socktop/KEY.gpg | \
-    sudo gpg --dearmor -o /usr/share/keyrings/socktop-archive-keyring.gpg
-
-echo "deb [signed-by=/usr/share/keyrings/socktop-archive-keyring.gpg] https://your-username.github.io/socktop stable main" | \
-    sudo tee /etc/apt/sources.list.d/socktop.list
-
-# Install
-sudo apt update
-sudo apt install socktop socktop-agent
-
-# Verify
-socktop --version
-socktop_agent --version
-```
-
-## Maintenance
-
-### Add a New Version
-
-```bash
-# Build new packages
-cargo deb --package socktop
-cargo deb --package socktop_agent
-
-# Add to repository
-./scripts/add-package-to-repo.sh target/debian/socktop_*.deb
-./scripts/add-package-to-repo.sh target/debian/socktop-agent_*.deb
-
-# Re-sign
-./scripts/sign-apt-repo.sh apt-repo stable YOUR-KEY-ID
-
-# Publish
-cd docs/apt  # or wherever your apt-repo is
-git add .
-git commit -m "Release v1.51.0"
-git push origin main
-```
-
-### Or Just Tag and Let GitHub Actions Do It
-
-```bash
-# Update version in Cargo.toml
-# Commit changes
-git add .
-git commit -m "Bump version to 1.51.0"
-
-# Tag and push
-git tag v1.51.0
-git push origin main --tags
-
-# GitHub Actions will:
-# - Build packages for AMD64 and ARM64
-# - Update gh-pages branch automatically
-# - Sign and publish!
-```
-
-## Troubleshooting
-
-### "Repository not signed" error
-
-Make sure you signed it:
-```bash
-./scripts/sign-apt-repo.sh apt-repo stable YOUR-KEY-ID
-ls apt-repo/dists/stable/Release*
-# Should show: Release, Release.gpg, InRelease, KEY.gpg
-```
-
-### "404 Not Found" on GitHub Pages
-
-1. Check Settings → Pages is enabled
-2. Wait 2-3 minutes for GitHub to deploy
-3. Verify the URL structure matches your settings
-
-### GitHub Actions not signing
-
-Check that all three secrets are set correctly:
-- Settings → Secrets and variables → Actions
-- Make sure GPG_PRIVATE_KEY includes the BEGIN/END lines
-- Test locally first
-
-## What's Next?
-
-✅ You now have a working APT repository!
-
-**Share it:**
-- Add installation instructions to your main README
-- Tweet/blog about it
-- Submit to awesome-rust lists
-
-**Improve it:**
-- Customize your GitHub Pages site (it's just HTML!)
-- Add more architectures (ARMv7)
-- Create multiple distributions (stable, testing)
-- Set up download statistics
-- Apply to Ubuntu PPA (Launchpad)
-- Eventually submit to official Debian repos
-
-## Full Documentation
-
-For detailed information, see:
-- `docs/APT_REPOSITORY.md` - Complete APT repository guide
-- `docs/DEBIAN_PACKAGING.md` - Debian packaging details
-- `DEBIAN_PACKAGING_SUMMARY.md` - Quick summary
-
-## Questions?
-
-Open an issue on GitHub or check the full documentation.
-
----
-
-**Happy packaging! 📦**

README.md

@@ -1,38 +1,545 @@
-# socktop APT Repository
+# socktop
 
-This repository contains Debian packages for socktop and socktop-agent.
+socktop is a remote system monitor with a rich TUI, inspired by top/btop, talking to a lightweight agent over WebSockets.
 
-## Adding this repository
+- Linux agent: near-zero CPU when idle (request-driven, no always-on sampler)
+- TUI: smooth graphs, sortable process table, scrollbars, readable colors
 
-Add the repository to your system:
+![socktop screenshot](./docs/14900ks_arch_alacritty_gpu_active_v2.jpg)
 
+---
+
+## Features
+
+- Remote monitoring via WebSocket (JSON over WS)
+- Optional WSS (TLS): agent auto‑generates a self‑signed cert on first run; client pins the cert via --tls-ca/-t 
+- TUI built with ratatui
+- CPU
+  - Overall sparkline + per-core mini bars
+  - Accurate per-process CPU% (Linux /proc deltas), normalized to 0–100%
+- Memory/Swap gauges with human units
+- Disks: per-device usage
+- Network: per-interface throughput with sparklines and peak markers
+- Temperatures: CPU (optional)
+- Top processes (top 50)
+  - PID, name, CPU%, memory, and memory%
+  - Click-to-sort by CPU% or Mem (descending)
+  - Scrollbar and mouse/keyboard scrolling
+  - Total process count shown in the header
+  - Only top-level processes listed (threads hidden) — matches btop/top
+- Optional GPU metrics (can be disabled)
+- Optional auth token for the agent
+
+---
+
+## Prerequisites: Install Rust (rustup)
+
+Rust is fast, safe, and cross‑platform. Installing it will make your machine better. Consider yourself privileged.
+
+Linux/macOS:
 ```bash
-# Add the GPG key
-curl -fsSL https://jasonwitty.github.io/socktop/KEY.gpg | sudo gpg --dearmor -o /usr/share/keyrings/socktop-archive-keyring.gpg
-
-# Add the repository
-echo "deb [signed-by=/usr/share/keyrings/socktop-archive-keyring.gpg] https://jasonwitty.github.io/socktop stable main" | sudo tee /etc/apt/sources.list.d/socktop.list
-
-# Update and install
-sudo apt update
-sudo apt install socktop socktop-agent
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+# load cargo for this shell
+source "$HOME/.cargo/env"
+# ensure stable is up to date
+rustup update stable
+rustc --version
+cargo --version
+# after install you may need to reload your shell, e.g.:
+exec bash   # or: exec zsh / exec fish
 ```
 
-## Manual Installation
+Windows (for the brave): install from https://rustup.rs with the MSVC toolchain. Yes, you’ll need Visual Studio Build Tools. You chose Windows — enjoy the ride.
 
-You can also download and install packages manually from the `pool/main/` directory.
+### Raspberry Pi / Ubuntu / PopOS (required)
+
+Install GPU support with apt command below
 
 ```bash
-wget https://jasonwitty.github.io/socktop/pool/main/socktop_VERSION_ARCH.deb
-sudo dpkg -i socktop_VERSION_ARCH.deb
+sudo apt-get update
+sudo apt-get install libdrm-dev libdrm-amdgpu1
 ```
 
-## Supported Architectures
+---
 
-- amd64 (x86_64)
-- arm64 (aarch64)
-- armhf (32-bit ARM)
+## Architecture
 
-## Building from Source
+Two components:
 
-See the main repository at https://github.com/jasonwitty/socktop
+1) Agent (remote): small Rust WS server using sysinfo + /proc. It collects metrics only when the client requests them over the WebSocket (request-driven). No background sampling loop.
+
+2) Client (local): TUI that connects to ws://HOST:PORT/ws (or wss://HOST:PORT/ws when TLS is enabled) and renders updates.
+
+---
+
+## Quick start
+
+- Build both binaries:
+
+```bash
+git clone https://github.com/jasonwitty/socktop.git
+cd socktop
+cargo build --release
+```
+
+- Start the agent on the target machine (default port 3000):
+
+```bash
+./target/release/socktop_agent --port 3000
+```
+
+- Connect with the TUI from your local machine:
+
+```bash
+./target/release/socktop ws://REMOTE_HOST:3000/ws
+```
+
+### Quick demo (no agent setup)
+
+Spin up a temporary local agent on port 3231 and connect automatically:
+
+```bash
+socktop --demo
+```
+
+Or just run `socktop` with no arguments and pick the built‑in `demo` entry from the interactive profile list (if you have saved profiles, `demo` is appended). The demo agent:
+
+- Runs locally (`ws://127.0.0.1:3231/ws`)
+- Stops automatically (you'll see "Stopped demo agent on port 3231") when you quit the TUI or press Ctrl-C
+
+---
+
+## Install (from crates.io)
+
+You don’t need to clone this repo to use socktop. Install the published binaries with cargo:
+
+```bash
+# TUI (client)
+cargo install socktop
+# Agent (server)
+cargo install socktop_agent
+```
+
+This drops socktop and socktop_agent into ~/.cargo/bin (add it to PATH).
+
+Notes:
+- After installing Rust via rustup, reload your shell (e.g., exec bash) so cargo is on PATH.
+- Windows: you can also grab prebuilt EXEs from GitHub Actions artifacts if rustup scares you. It shouldn’t. Be brave.
+
+System-wide agent (Linux)
+
+```bash
+# If you installed with cargo, binaries are in ~/.cargo/bin
+sudo install -o root -g root -m 0755 "$HOME/.cargo/bin/socktop_agent" /usr/local/bin/socktop_agent
+
+# Install and enable the systemd service (example unit in docs/)
+sudo install -o root -g root -m 0644 docs/socktop-agent.service /etc/systemd/system/socktop-agent.service
+sudo systemctl daemon-reload
+sudo systemctl enable --now socktop-agent
+```
+
+```bash
+
+# Enable SSL
+
+# Stop service
+sudo systemctl stop socktop-agent
+
+# Edit service to append SSL option and port
+sudo micro /etc/systemd/system/socktop-agent.service
+
+--
+ExecStart=/usr/local/bin/socktop_agent --enableSSL --port 8443
+--
+
+# Reload
+sudo systemctl daemon-reload
+
+# Restart
+sudo systemctl start socktop-agent
+
+# check logs for certificate location
+sudo journalctl -u socktop-agent -f
+
+--
+Aug 22 22:25:26 rpi-master socktop_agent[2913998]: socktop_agent: generated self-signed TLS certificate at /var/lib/socktop/.config/socktop_agent/tls/cert.pem
+--
+
+```
+
+
+---
+
+## Usage
+
+Agent (server):
+
+```bash
+socktop_agent --port 3000
+# or env: SOCKTOP_PORT=3000 socktop_agent
+# optional auth: SOCKTOP_TOKEN=changeme socktop_agent
+# enable TLS (self‑signed cert, default port 8443; you can also use -p):
+socktop_agent --enableSSL --port 8443
+```
+
+Client (TUI):
+
+```bash
+socktop ws://HOST:3000/ws
+# with token:
+socktop "ws://HOST:3000/ws?token=changeme"
+# TLS with pinned server certificate (recommended over the internet):
+socktop --tls-ca /path/to/cert.pem wss://HOST:8443/ws
+# (By default hostname/SAN verification is skipped for ease on home networks. To enforce it add --verify-hostname)
+socktop --verify-hostname --tls-ca /path/to/cert.pem wss://HOST:8443/ws
+# shorthand:
+socktop -t /path/to/cert.pem wss://HOST:8443/ws
+# Note: providing --tls-ca/-t automatically upgrades ws:// to wss:// if you forget
+```
+
+Intervals (client-driven):
+- Fast metrics: ~500 ms
+- Processes: ~2 s (top 50)
+- Disks: ~5 s
+
+The agent stays idle unless queried. When queried, it collects just what’s needed.
+
+---
+
+## Connection Profiles (Named)
+
+You can save frequently used connection settings (URL + optional TLS CA path) under a short name and reuse them later.
+
+Config file location:
+
+- Linux (XDG): `$XDG_CONFIG_HOME/socktop/profiles.json`
+- Fallback (when XDG not set): `~/.config/socktop/profiles.json`
+
+### Creating a profile
+
+First time you specify a new `--profile/-P` name together with a URL (and optional `--tls-ca`), it is saved automatically:
+
+```bash
+socktop --profile prod ws://prod-host:3000/ws
+# With TLS pinning:
+socktop --profile prod-tls --tls-ca /path/to/cert.pem wss://prod-host:8443/ws
+
+You can also set custom intervals (milliseconds):
+
+```bash
+socktop --profile prod --metrics-interval-ms 750 --processes-interval-ms 3000 ws://prod-host:3000/ws
+```
+```
+
+If a profile already exists you will be prompted before overwriting:
+
+```
+$ socktop --profile prod ws://new-host:3000/ws
+Overwrite existing profile 'prod'? [y/N]: y
+```
+
+To overwrite without an interactive prompt pass `--save`:
+
+```bash
+socktop --profile prod --save ws://new-host:3000/ws
+```
+
+### Using a saved profile
+
+Just pass the profile name (no URL needed):
+
+```bash
+socktop --profile prod
+socktop -P prod-tls      # short flag
+```
+
+The stored URL (and TLS CA path, if any) plus any saved intervals will be used. TLS auto-upgrade still applies if a CA path is stored alongside a ws:// URL.
+
+### Interactive selection (no args)
+
+If you run `socktop` with no arguments and at least one profile exists, you will be shown a numbered list to pick from:
+
+```
+$ socktop
+Select profile:
+  1. prod
+  2. prod-tls
+Enter number (or blank to abort): 2
+```
+
+Choosing a number starts the TUI with that profile. A built‑in `demo` option is always appended; selecting it launches a local agent on port 3231 (no TLS) and connects to `ws://127.0.0.1:3231/ws`. Pressing Enter on blank aborts without connecting.
+
+### JSON format
+
+An example `profiles.json` (pretty‑printed):
+
+```json
+{
+  "profiles": {
+    "prod": { "url": "ws://prod-host:3000/ws" },
+    "prod-tls": {
+      "url": "wss://prod-host:8443/ws",
+      "tls_ca": "/home/user/certs/prod-cert.pem",
+      "metrics_interval_ms": 500,
+      "processes_interval_ms": 2000
+    }
+  },
+  "version": 0
+}
+```
+
+Notes:
+- The `tls_ca` path is stored as given; if you move or rotate the certificate update the profile by re-running with `--profile NAME --save`.
+- Deleting a profile: edit the JSON file and remove the entry (TUI does not yet have an in-app delete command).
+- Profiles are client-side convenience only; they do not affect the agent.
+- Intervals: `metrics_interval_ms` controls the fast metrics poll (default 500 ms). `processes_interval_ms` controls process list polling (default 2000 ms). Values below 100 ms (metrics) or 200 ms (processes) are clamped.
+
+---
+
+## Updating
+
+Update the agent (systemd):
+
+```bash
+# on the server running the agent
+cargo install socktop_agent --force
+sudo systemctl stop socktop-agent
+sudo install -o root -g root -m 0755 "$HOME/.cargo/bin/socktop_agent" /usr/local/bin/socktop_agent
+# if you changed the unit file:
+# sudo install -o root -g root -m 0644 docs/socktop-agent.service /etc/systemd/system/socktop-agent.service
+# sudo systemctl daemon-reload
+sudo systemctl start socktop-agent
+sudo systemctl status socktop-agent --no-pager
+# logs:
+# journalctl -u socktop-agent -f
+```
+
+Update the TUI (client):
+```bash
+cargo install socktop --force
+socktop ws://HOST:3000/ws
+```
+
+Tip: If only the binary changed, restart is enough. If the unit file changed, run sudo systemctl daemon-reload.
+
+---
+
+## Configuration (agent)
+
+- Port:
+  - Flag: --port 8080 or -p 8080
+  - Positional: socktop_agent 8080
+  - Env: SOCKTOP_PORT=8080
+- TLS (self‑signed):
+  - Enable: --enableSSL
+  - Default TLS port: 8443 (override with --port/-p)
+  - Certificate/Key location (created on first TLS run):
+    - Linux (XDG): $XDG_CONFIG_HOME/socktop_agent/tls/{cert.pem,key.pem} (defaults to ~/.config)
+    - The agent prints these paths on creation.
+  - You can set XDG_CONFIG_HOME before first run to control where certs are written.
+  - Additional SANs: set `SOCKTOP_AGENT_EXTRA_SANS` (comma‑separated) before first TLS start to include extra IPs/DNS names in the cert. Example:
+    ```bash
+    SOCKTOP_AGENT_EXTRA_SANS="192.168.1.101,myhost.internal" socktop_agent --enableSSL
+    ```
+    This prevents client errors like `NotValidForName` when connecting via an IP not present in the default cert SAN list.
+  - Expiry / rotation: the generated cert is valid for ~397 days from creation. If the agent fails to start with an "ExpiredCertificate" error (or your client reports expiry), simply delete the existing cert and key:
+    ```bash
+    rm ~/.config/socktop_agent/tls/cert.pem ~/.config/socktop_agent/tls/key.pem
+    # (adjust path if XDG_CONFIG_HOME is set or different user)
+    systemctl restart socktop-agent   # if running under systemd
+    ```
+    On next TLS start the agent will generate a fresh pair. Only distribute the new cert.pem to clients (never the key).
+- Auth token (optional): SOCKTOP_TOKEN=changeme
+- Disable GPU metrics: SOCKTOP_AGENT_GPU=0
+- Disable CPU temperature: SOCKTOP_AGENT_TEMP=0
+
+---
+
+## Keyboard & Mouse
+
+- Quit: q or Esc
+- Processes pane:
+  - Click “CPU %” to sort by CPU descending
+  - Click “Mem” to sort by memory descending
+  - Mouse wheel: scroll
+  - Drag scrollbar: scroll
+  - Arrow/PageUp/PageDown/Home/End: scroll
+
+---
+
+## Example agent JSON
+
+```json
+{
+  "cpu_total": 12.4,
+  "cpu_per_core": [11.2, 15.7],
+  "mem_total": 33554432,
+  "mem_used": 18321408,
+  "swap_total": 0,
+  "swap_used": 0,
+  "process_count": 127,
+  "hostname": "myserver",
+  "cpu_temp_c": 42.5,
+  "disks": [{"name":"nvme0n1p2","total":512000000000,"available":320000000000}],
+  "networks": [{"name":"eth0","received":12345678,"transmitted":87654321}],
+  "top_processes": [
+    {"pid":1234,"name":"nginx","cpu_usage":1.2,"mem_bytes":12345678}
+  ],
+  "gpus": null
+}
+```
+
+Notes:
+- process_count is merged into the main metrics on the client when processes are polled.
+- top_processes are the current top 50 (sorting in the TUI is client-side).
+
+---
+
+## Security
+
+Set a token on the agent and pass it as a query param from the client:
+
+Server:
+
+```bash
+SOCKTOP_TOKEN=changeme socktop_agent --port 3000
+```
+
+Client:
+
+```bash
+socktop "ws://HOST:3000/ws?token=changeme"
+```
+
+### TLS / WSS
+
+For encrypted connections, enable TLS on the agent and pin the server certificate on the client.
+
+Server (generates self‑signed cert and key on first run):
+
+```bash
+socktop_agent --enableSSL --port 8443
+```
+
+Client (trust/pin the server cert; copy cert.pem from the agent):
+
+```bash
+socktop --tls-ca /path/to/agent/cert.pem wss://HOST:8443/ws
+```
+
+Notes:
+- Do not copy the private key off the server; only the cert.pem is needed by clients.
+- When --tls-ca/-t is supplied, the client auto‑upgrades ws:// to wss:// to avoid protocol mismatch.
+- Hostname (SAN) verification is DISABLED by default (the cert is still pinned). Use `--verify-hostname` to enable strict SAN checking.
+- You can run multiple clients with different cert paths by passing --tls-ca per invocation.
+
+---
+
+## Using tmux to monitor multiple hosts
+
+You can use tmux to show multiple socktop instances in a single terminal.
+
+![socktop screenshot](./docs/tmux_4_rpis_v3.jpg)
+monitoring 4 Raspberry Pis using Tmux
+
+Prerequisites:
+- Install tmux (Ubuntu/Debian: `sudo apt-get install tmux`)
+
+Key bindings (defaults):
+- Split left/right: Ctrl-b %
+- Split top/bottom: Ctrl-b "
+- Move between panes: Ctrl-b + Arrow keys
+- Show pane numbers: Ctrl-b q
+- Close a pane: Ctrl-b x
+- Detach from session: Ctrl-b d
+
+Two panes (left/right)
+- This creates a session named "socktop", splits it horizontally, and starts two socktops.
+
+```bash
+tmux new-session -d -s socktop 'socktop ws://HOST1:3000/ws' \; \
+  split-window -h 'socktop ws://HOST2:3000/ws' \; \
+  select-layout even-horizontal \; \
+  attach
+```
+
+Four panes (top-left, top-right, bottom-left, bottom-right)
+- This creates a 2x2 grid with one socktop per pane.
+
+```bash
+tmux new-session -d -s socktop 'socktop ws://HOST1:3000/ws' \; \
+  split-window -h 'socktop ws://HOST2:3000/ws' \; \
+  select-pane -t 0 \; split-window -v 'socktop ws://HOST3:3000/ws' \; \
+  select-pane -t 1 \; split-window -v 'socktop ws://HOST4:3000/ws' \; \
+  select-layout tiled \; \
+  attach
+```
+
+Tips:
+- Replace HOST1..HOST4 (and ports) with your targets.
+- Reattach later: `tmux attach -t socktop`
+
+---
+
+## Platform notes
+
+- Linux: fully supported (agent and client).
+- Raspberry Pi:
+  - 64-bit: aarch64-unknown-linux-gnu
+  - 32-bit: armv7-unknown-linux-gnueabihf
+- Windows:
+  - TUI + agent can build with stable Rust; bring your own MSVC. You’re on Windows; you know the drill.
+  - CPU temperature may be unavailable.
+  - binary exe for both available in build artifacts under actions.
+- macOS:
+  - TUI works; agent is primarily targeted at Linux. Agent will run just fine on macos for debugging but I have not documented how to run as a service, I may not given the "security" feautures with applications on macos. We will see. 
+
+---
+
+## Development
+
+```bash
+cargo fmt
+cargo clippy --all-targets --all-features
+cargo run -p socktop -- ws://127.0.0.1:3000/ws
+# TLS (dev): first run will create certs under ~/.config/socktop_agent/tls/
+cargo run -p socktop_agent -- --enableSSL --port 8443
+```
+
+### Auto-format on commit
+
+A sample pre-commit hook that runs `cargo fmt --all` is provided in `.githooks/pre-commit`.
+Enable it (one-time):
+
+```bash
+git config core.hooksPath .githooks
+chmod +x .githooks/pre-commit
+```
+
+Every commit will then format Rust sources and restage them automatically.
+
+---
+
+## Roadmap
+
+- [x] Agent authentication (token)
+- [x] Hide per-thread entries; only show processes
+- [x] Sort top processes in the TUI
+- [ ] Configurable refresh intervals (client)
+- [ ] Export metrics to file
+- [x] TLS / WSS support (self‑signed server cert + client pinning)
+- [x] Split processes/disks to separate WS calls with independent cadences (already logical on client; formalize API)
+
+---
+
+## License
+
+MIT — see LICENSE.
+
+---
+
+## Acknowledgements
+
+- ratatui for the TUI
+- sysinfo for system metrics
+- tokio-tungstenite for WebSockets

SETUP_GITHUB_PAGES.md

@@ -1,351 +0,0 @@
-# Setting Up GitHub Pages for socktop APT Repository
-
-This guide walks you through the initial setup of your APT repository on GitHub Pages using the `gh-pages` branch.
-
-## Prerequisites
-
-- [ ] You've run `./scripts/setup-apt-repo.sh` or manually created `apt-repo/`
-- [ ] `apt-repo/` contains signed packages and metadata
-- [ ] You have a GitHub repository for socktop
-
-## Step-by-Step Setup
-
-### 1. Verify Your Local Repository
-
-First, make sure everything is ready:
-
-```bash
-# Check that apt-repo exists and has content
-ls -la apt-repo/
-
-# You should see:
-# - dists/stable/Release, Release.gpg, InRelease
-# - pool/main/*.deb
-# - KEY.gpg
-# - index.html, README.md
-```
-
-### 2. Create and Switch to gh-pages Branch
-
-```bash
-# Create a new orphan branch (no history from main)
-git checkout --orphan gh-pages
-
-# Remove all files from staging
-git rm -rf .
-```
-
-**Important:** This creates a completely separate branch. Don't worry - your main branch is safe!
-
-### 3. Copy APT Repository to Root
-
-```bash
-# Copy CONTENTS of apt-repo to root of gh-pages
-cp -r apt-repo/* .
-
-# Remove the apt-repo directory itself
-rm -rf apt-repo
-
-# Verify the structure
-ls -la
-
-# You should see in the current directory:
-# - dists/
-# - pool/
-# - KEY.gpg
-# - index.html
-# - README.md
-```
-
-**Why root?** GitHub Pages can only serve from:
-- `/` (root) - what we're doing
-- `/docs` directory
-- NOT from custom directories like `/apt-repo`
-
-### 4. Commit and Push
-
-```bash
-# Add all files
-git add .
-
-# Commit
-git commit -m "Initialize APT repository for GitHub Pages"
-
-# Push to gh-pages branch
-git push -u origin gh-pages
-```
-
-### 5. Return to Main Branch
-
-```bash
-# Switch back to your main development branch
-git checkout main
-
-# Verify you're back on main
-git branch
-# Should show: * main
-```
-
-### 6. Enable GitHub Pages
-
-1. Go to your repository on GitHub
-2. Click **Settings** (top right)
-3. Click **Pages** (left sidebar)
-4. Under "Build and deployment":
-   - Source: **Deploy from a branch**
-   - Branch: **gh-pages** 
-   - Folder: **/ (root)**
-   - Click **Save**
-
-### 7. Wait for Deployment
-
-GitHub will deploy your site. This usually takes 1-2 minutes.
-
-You can watch the progress:
-- Go to **Actions** tab
-- Look for "pages build and deployment" workflow
-
-### 8. Verify Your Repository is Live
-
-Once deployed, your repository will be at:
-
-```
-https://YOUR-USERNAME.github.io/socktop/
-```
-
-Test it:
-
-```bash
-# Check the public key is accessible
-curl -I https://YOUR-USERNAME.github.io/socktop/KEY.gpg
-
-# Should return: HTTP/2 200
-
-# Check the Release file
-curl -I https://YOUR-USERNAME.github.io/socktop/dists/stable/Release
-
-# Should return: HTTP/2 200
-```
-
-### 9. Test Installation (Optional but Recommended)
-
-On a Debian/Ubuntu VM or system:
-
-```bash
-# Add GPG key
-curl -fsSL https://YOUR-USERNAME.github.io/socktop/KEY.gpg | \
-    sudo gpg --dearmor -o /usr/share/keyrings/socktop-archive-keyring.gpg
-
-# Add repository
-echo "deb [signed-by=/usr/share/keyrings/socktop-archive-keyring.gpg] https://YOUR-USERNAME.github.io/socktop stable main" | \
-    sudo tee /etc/apt/sources.list.d/socktop.list
-
-# Update package lists
-sudo apt update
-
-# You should see:
-# Get:1 https://YOUR-USERNAME.github.io/socktop stable InRelease [xxx B]
-
-# Install packages
-sudo apt install socktop socktop-agent
-
-# Verify
-socktop --version
-```
-
-## Understanding the Two Branches
-
-After setup, you'll have two branches:
-
-### `main` branch (development)
-```
-main/
-├── src/
-├── Cargo.toml
-├── scripts/
-├── docs/
-├── apt-repo/          ← Local build artifact (not published)
-└── ...
-```
-
-**Purpose:** Source code, development, building packages
-
-### `gh-pages` branch (published)
-```
-gh-pages/
-├── dists/
-├── pool/
-├── KEY.gpg
-├── index.html         ← Customize this for a nice landing page!
-└── README.md
-```
-
-**Purpose:** Published APT repository served by GitHub Pages
-
-## Workflow Going Forward
-
-### Manual Updates
-
-When you release a new version:
-
-```bash
-# 1. On main branch, build new packages
-git checkout main
-cargo deb --package socktop
-cargo deb --package socktop_agent
-
-# 2. Update local apt-repo
-./scripts/add-package-to-repo.sh target/debian/socktop_*.deb
-./scripts/add-package-to-repo.sh target/debian/socktop-agent_*.deb
-./scripts/sign-apt-repo.sh apt-repo stable YOUR-GPG-KEY-ID
-
-# 3. Switch to gh-pages and update
-git checkout gh-pages
-cp -r apt-repo/* .
-git add .
-git commit -m "Release v1.51.0"
-git push origin gh-pages
-
-# 4. Return to main
-git checkout main
-```
-
-### Automated Updates (Recommended)
-
-Set up GitHub Actions to do this automatically:
-
-1. Add GitHub Secrets (Settings → Secrets → Actions):
-   - `GPG_PRIVATE_KEY` - Your exported private key
-   - `GPG_KEY_ID` - Your GPG key ID
-   - `GPG_PASSPHRASE` - Your GPG passphrase (if any)
-
-2. Tag and push:
-   ```bash
-   git tag v1.51.0
-   git push origin main --tags
-   ```
-
-3. GitHub Actions will automatically:
-   - Build packages for AMD64 and ARM64
-   - Update apt-repo
-   - Sign with your GPG key
-   - Push to gh-pages
-   - Create GitHub Release
-
-See `.github/workflows/publish-apt-repo.yml` for details.
-
-## Customizing Your GitHub Pages Site
-
-The `gh-pages` branch contains `index.html` which users see when they visit:
-`https://YOUR-USERNAME.github.io/socktop/`
-
-You can customize this! On the `gh-pages` branch:
-
-```bash
-git checkout gh-pages
-
-# Edit index.html
-nano index.html
-
-# Add features, badges, screenshots, etc.
-
-git add index.html
-git commit -m "Improve landing page"
-git push origin gh-pages
-
-git checkout main
-```
-
-## Troubleshooting
-
-### "404 Not Found" on GitHub Pages
-
-**Check:**
-- Settings → Pages shows "Your site is live at..."
-- Wait 2-3 minutes after pushing
-- Verify branch is `gh-pages` and folder is `/`
-- Check Actions tab for deployment errors
-
-### "Repository not found" when installing
-
-**Check:**
-- URL is correct: `https://USERNAME.github.io/REPO/` (no trailing /apt-repo)
-- Files exist at the URLs:
-  ```bash
-  curl -I https://USERNAME.github.io/REPO/dists/stable/InRelease
-  curl -I https://USERNAME.github.io/REPO/KEY.gpg
-  ```
-
-### "GPG error" when installing
-
-**Check:**
-- Repository is signed: `ls gh-pages/dists/stable/Release.gpg`
-- Users imported the key: `curl https://USERNAME.github.io/REPO/KEY.gpg | gpg --import`
-
-### Changes not appearing
-
-**Check:**
-- You committed and pushed to `gh-pages` (not `main`)
-- Wait 1-2 minutes for GitHub to redeploy
-- Clear browser cache if viewing index.html
-- For apt: `sudo apt clean && sudo apt update`
-
-## Success Checklist
-
-After completing this guide, you should have:
-
-- [ ] `gh-pages` branch created and pushed
-- [ ] GitHub Pages enabled and deployed
-- [ ] Site accessible at `https://USERNAME.github.io/socktop/`
-- [ ] `KEY.gpg` downloadable
-- [ ] `dists/stable/InRelease` accessible
-- [ ] Packages in `pool/main/*.deb` downloadable
-- [ ] Successfully tested installation on a test system
-- [ ] Understand the workflow for future updates
-
-## Next Steps
-
-1. **Update your main README.md** with installation instructions
-2. **Set up GitHub Actions** for automated releases
-3. **Customize index.html** on gh-pages for a nice landing page
-4. **Test on multiple architectures** (AMD64, ARM64)
-5. **Share your repository** with users
-
-## Quick Reference
-
-**Switch branches:**
-```bash
-git checkout main        # Development
-git checkout gh-pages    # Published site
-```
-
-**Update published site manually:**
-```bash
-git checkout main
-# ... build packages, update apt-repo ...
-git checkout gh-pages
-cp -r apt-repo/* .
-git add . && git commit -m "Update" && git push
-git checkout main
-```
-
-**Your repository URL:**
-```
-https://YOUR-USERNAME.github.io/socktop/
-```
-
-**User installation command:**
-```bash
-curl -fsSL https://YOUR-USERNAME.github.io/socktop/KEY.gpg | \
-    sudo gpg --dearmor -o /usr/share/keyrings/socktop-archive-keyring.gpg
-echo "deb [signed-by=/usr/share/keyrings/socktop-archive-keyring.gpg] https://YOUR-USERNAME.github.io/socktop stable main" | \
-    sudo tee /etc/apt/sources.list.d/socktop.list
-sudo apt update && sudo apt install socktop socktop-agent
-```
-
----
-
-**Need help?** See:
-- `QUICK_START_APT_REPO.md` - Overall quick start
-- `docs/APT_REPOSITORY.md` - Comprehensive guide
-- `docs/APT_WORKFLOW.md` - Visual workflow diagrams

WHY_GHPAGES_BRANCH.md

@@ -1,119 +0,0 @@
-# Why We Use the gh-pages Branch
-
-## The Problem
-
-GitHub Pages has a limitation - it can only serve static sites from:
-
-1. **`/` (root)** of a branch
-2. **`/docs`** directory of a branch
-3. **NOT** from custom directories like `/apt-repo`
-
-## Why Not `/docs`?
-
-When you tried to enable GitHub Pages with `apt-repo/` checked into main, you couldn't select it because:
-
-```
-main/
-├── src/
-├── Cargo.toml
-├── apt-repo/          ← GitHub Pages can't serve from here!
-└── ...
-```
-
-You could move it to `/docs`:
-```
-main/
-├── src/
-├── Cargo.toml
-├── docs/              ← GitHub Pages CAN serve from here
-│   ├── dists/
-│   ├── pool/
-│   └── ...
-└── ...
-```
-
-But this has downsides:
-- ❌ Mixed source code and published content
-- ❌ Large .deb files bloat the main branch
-- ❌ Can't easily customize the site without affecting source
-- ❌ Messy git history with binary files
-
-## Why gh-pages Branch (Our Solution)
-
-Using a separate `gh-pages` branch is cleaner:
-
-```
-main branch (source code):
-├── src/
-├── Cargo.toml
-├── scripts/
-└── docs/             ← Documentation source
-
-gh-pages branch (published):
-├── dists/
-├── pool/
-├── KEY.gpg
-├── index.html        ← Customizable landing page
-└── README.md
-```
-
-### Benefits
-
-✅ **Clean separation**: Source code stays in `main`, published content in `gh-pages`  
-✅ **No binary bloat**: .deb files don't clutter your main branch history  
-✅ **Easy automation**: GitHub Actions can push to gh-pages without affecting main  
-✅ **Customizable**: You can make a beautiful landing page on gh-pages  
-✅ **Standard practice**: Most GitHub Pages projects use gh-pages branch  
-✅ **Root URL**: Your repo is at `https://username.github.io/socktop/` (not `/apt-repo`)  
-
-### Workflow
-
-```
-Developer (main branch)
-    ↓
-  Build packages
-    ↓
-  Update apt-repo/ (local)
-    ↓
-  Push to gh-pages branch
-    ↓
-  GitHub Pages serves
-    ↓
-  Users: apt install socktop
-```
-
-## The Setup
-
-**One-time setup:**
-```bash
-git checkout --orphan gh-pages
-git rm -rf .
-cp -r apt-repo/* .
-rm -rf apt-repo
-git add . && git commit -m "Initialize APT repository"
-git push -u origin gh-pages
-git checkout main
-```
-
-**Going forward:**
-- Work on `main` branch for development
-- `gh-pages` branch gets updated by GitHub Actions (or manually)
-- Never need to switch branches manually after automation is set up!
-
-## Comparison
-
-| Approach | Location | URL | Pros | Cons |
-|----------|----------|-----|------|------|
-| **gh-pages branch** ✅ | gh-pages:/ | `username.github.io/socktop/` | Clean, automated, customizable | Two branches |
-| `/docs` on main | main:/docs | `username.github.io/socktop/` | One branch | Mixed content, binary bloat |
-| `/apt-repo` on main | main:/apt-repo | ❌ Not possible | - | GitHub Pages won't allow it |
-
-## Conclusion
-
-The `gh-pages` branch approach is:
-- The **cleanest** solution
-- The **most flexible** for customization
-- The **easiest to automate**
-- **Industry standard** for GitHub Pages
-
-That's why we chose it! 🚀

dists/stable/InRelease

@@ -1,43 +0,0 @@
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-Hash: SHA512
-
-Origin: socktop
-Label: socktop
-Suite: stable
-Codename: stable
-Architectures: amd64 arm64 armhf riscv64
-Components: main
-Description: socktop APT repository
-Date: Mon, 24 Nov 2025 20:01:32 +0000
-MD5Sum:
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-SHA256:
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-Label: socktop
-Suite: stable
-Codename: stable
-Architectures: amd64 arm64 armhf riscv64
-Components: main
-Description: socktop APT repository
-Date: Mon, 24 Nov 2025 20:01:32 +0000
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dists/stable/main/binary-amd64/Packages

@@ -1,40 +0,0 @@
-Package: socktop
-Version: 1.50.0-1
-Architecture: amd64
-Maintainer: Jason Witty <jasonpwitty+socktop@proton.me>
-Installed-Size: 3447
-Depends: libc6 (>= 2.39)
-Filename: pool/main/socktop_1.50.0-1_amd64.deb
-Size: 1277472
-MD5sum: 8af32694d8ea66feb97bc9896dd1034f
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-SHA256: 59ade1d2cc919fa672c2b8b50a05905defc1a220776949b78743d054eaa07994
-Section: admin
-Priority: optional
-Homepage: https://github.com/jasonwitty/socktop
-Description: Remote system monitor over WebSocket, TUI like top
- socktop is a remote system monitor with a rich terminal user interface (TUI)
- that connects to remote hosts running the socktop_agent over WebSocket. It
- provides real-time monitoring of CPU, memory, processes, and more with an
- interface similar to the traditional 'top' command.
-
-Package: socktop-agent
-Version: 1.50.2-1
-Architecture: amd64
-Maintainer: Jason Witty <jasonpwitty+socktop@proton.me>
-Installed-Size: 6726
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-Section: admin
-Priority: optional
-Homepage: https://github.com/jasonwitty/socktop
-Description: Socktop agent daemon. Serves host metrics over WebSocket.
- socktop_agent is the daemon component that runs on remote hosts to collect and
- serve system metrics over WebSocket. It gathers CPU, memory, disk, network,
- GPU, and process information that can be monitored remotely by the socktop TUI
- client.
-

dists/stable/main/binary-amd64/Release

@@ -1,5 +0,0 @@
-Archive: stable
-Component: main
-Origin: socktop
-Label: socktop
-Architecture: amd64

dists/stable/main/binary-arm64/Packages

@@ -1,40 +0,0 @@
-Package: socktop
-Version: 1.50.0-1
-Architecture: arm64
-Maintainer: Jason Witty <jasonpwitty+socktop@proton.me>
-Installed-Size: 2908
-Depends: libc6 (>= 2.39)
-Filename: pool/main/socktop_1.50.0-1_arm64.deb
-Size: 1139764
-MD5sum: 05fa53ec3555238b6454ffe44acba4a5
-SHA1: c6f062f0d191e45d34e2d349864dfa552433bd0c
-SHA256: 976de361b1f867e5c3fe1b8bba34862f6e92564980367a1b5a9ff024c7825273
-Section: admin
-Priority: optional
-Homepage: https://github.com/jasonwitty/socktop
-Description: Remote system monitor over WebSocket, TUI like top
- socktop is a remote system monitor with a rich terminal user interface (TUI)
- that connects to remote hosts running the socktop_agent over WebSocket. It
- provides real-time monitoring of CPU, memory, processes, and more with an
- interface similar to the traditional 'top' command.
-
-Package: socktop-agent
-Version: 1.50.2-1
-Architecture: arm64
-Maintainer: Jason Witty <jasonpwitty+socktop@proton.me>
-Installed-Size: 5220
-Depends: libc6 (>= 2.39), libdrm-amdgpu1 (>= 2.4.80)
-Filename: pool/main/socktop-agent_1.50.2-1_arm64.deb
-Size: 1645464
-MD5sum: 517f46814ffc34ca3075ce0fc6020f1f
-SHA1: a120d9b763b453c0e860fea8e3f121e4cabda329
-SHA256: 72d562c50f4de437c5e8f46fb79cc0216b96f5bdc2b96958a51ae69aa156eead
-Section: admin
-Priority: optional
-Homepage: https://github.com/jasonwitty/socktop
-Description: Socktop agent daemon. Serves host metrics over WebSocket.
- socktop_agent is the daemon component that runs on remote hosts to collect and
- serve system metrics over WebSocket. It gathers CPU, memory, disk, network,
- GPU, and process information that can be monitored remotely by the socktop TUI
- client.
-

dists/stable/main/binary-armhf/Packages

@@ -1,40 +0,0 @@
-Package: socktop
-Version: 1.50.0-1
-Architecture: armhf
-Maintainer: Jason Witty <jasonpwitty+socktop@proton.me>
-Installed-Size: 2706
-Depends: libc6:armhf (>= 2.39)
-Filename: pool/main/socktop_1.50.0-1_armhf.deb
-Size: 986508
-MD5sum: 5872abb834d52fefd05d3be848c0c466
-SHA1: c2cd0f4bc1578541836f44c8595a90b07815448f
-SHA256: c246bd1fbad3598129dd3101296791aa75d0d817d2a9b33ea18e21b95712bdeb
-Section: admin
-Priority: optional
-Homepage: https://github.com/jasonwitty/socktop
-Description: Remote system monitor over WebSocket, TUI like top
- socktop is a remote system monitor with a rich terminal user interface (TUI)
- that connects to remote hosts running the socktop_agent over WebSocket. It
- provides real-time monitoring of CPU, memory, processes, and more with an
- interface similar to the traditional 'top' command.
-
-Package: socktop-agent
-Version: 1.50.2-1
-Architecture: armhf
-Maintainer: Jason Witty <jasonpwitty+socktop@proton.me>
-Installed-Size: 3919
-Depends: libc6:armhf (>= 2.39)
-Filename: pool/main/socktop-agent_1.50.2-1_armhf.deb
-Size: 1494848
-MD5sum: 90aae9922ffe58b9685c10e38cdb91f0
-SHA1: f8aab5171952a9a5b1251a00e907ae6805286edd
-SHA256: 6c1f813a899416243a8c6d11dd424832a8a7184e3da200ba72e3afe23cb5fcd6
-Section: admin
-Priority: optional
-Homepage: https://github.com/jasonwitty/socktop
-Description: Socktop agent daemon. Serves host metrics over WebSocket.
- socktop_agent is the daemon component that runs on remote hosts to collect and
- serve system metrics over WebSocket. It gathers CPU, memory, disk, network,
- GPU, and process information that can be monitored remotely by the socktop TUI
- client.
-

dists/stable/main/binary-riscv64/Packages

@@ -1,40 +0,0 @@
-Package: socktop
-Version: 1.50.0-1
-Architecture: riscv64
-Maintainer: Jason Witty <jasonpwitty+socktop@proton.me>
-Installed-Size: 2664
-Depends: libc6:riscv64 (>= 2.39)
-Filename: pool/main/socktop_1.50.0-1_riscv64.deb
-Size: 1133776
-MD5sum: 8d35cb4a2e61e4817bedd36362f3d21e
-SHA1: 242c3818e20e4fa8ab2fd6bd9a897aab0246c01d
-SHA256: c8138d798820fc0bcdcf12a945f35b6a45635cbec109548ce65cb4ab3db7690a
-Section: admin
-Priority: optional
-Homepage: https://github.com/jasonwitty/socktop
-Description: Remote system monitor over WebSocket, TUI like top
- socktop is a remote system monitor with a rich terminal user interface (TUI)
- that connects to remote hosts running the socktop_agent over WebSocket. It
- provides real-time monitoring of CPU, memory, processes, and more with an
- interface similar to the traditional 'top' command.
-
-Package: socktop-agent
-Version: 1.50.2-1
-Architecture: riscv64
-Maintainer: Jason Witty <jasonpwitty+socktop@proton.me>
-Installed-Size: 4068
-Depends: libc6:riscv64 (>= 2.39)
-Filename: pool/main/socktop-agent_1.50.2-1_riscv64.deb
-Size: 1698504
-MD5sum: 76249497cbd2bb14e86b0a680a628d22
-SHA1: 1b427d86313d2d906886f33f5f274b6515958245
-SHA256: 52f17798f0a208a5067a266fad84e535c30137620273a218caac465fb969f48e
-Section: admin
-Priority: optional
-Homepage: https://github.com/jasonwitty/socktop
-Description: Socktop agent daemon. Serves host metrics over WebSocket.
- socktop_agent is the daemon component that runs on remote hosts to collect and
- serve system metrics over WebSocket. It gathers CPU, memory, disk, network,
- GPU, and process information that can be monitored remotely by the socktop TUI
- client.
-

docs/socktop-agent.service

@@ -0,0 +1,18 @@
+[Unit]
+Description=Socktop agent
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/socktop_agent --port 3000
+Environment=RUST_LOG=info
+# Optional auth:
+# Environment=SOCKTOP_TOKEN=changeme
+Restart=on-failure
+User=socktop
+Group=socktop
+NoNewPrivileges=true
+
+[Install]
+WantedBy=multi-user.target

index.html

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-<html lang="en">
-    <head>
-        <meta charset="UTF-8" />
-        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-        <title>socktop APT Repository</title>
-        <style>
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-                    font-size: 1.5em;
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-            }
-        </style>
-    </head>
-    <body>
-        <div class="container">
-            <h1>socktop APT Repository</h1>
-            <p class="subtitle">
-                System monitor with remote agent support for Linux systems
-            </p>
-
-            <h2>📦 Quick Installation</h2>
-            <p>Add this repository to your Debian/Ubuntu system:</p>
-
-            <h3>Step 1: Add GPG Key</h3>
-            <pre><code># Add the repository's GPG signing key
-curl -fsSL https://jasonwitty.github.io/socktop/KEY.gpg | \
-    sudo gpg --dearmor -o /usr/share/keyrings/socktop-archive-keyring.gpg</code></pre>
-
-            <h3>Step 2: Add Repository</h3>
-            <pre><code># Add the APT repository to your sources
-echo "deb [signed-by=/usr/share/keyrings/socktop-archive-keyring.gpg] https://jasonwitty.github.io/socktop stable main" | \
-    sudo tee /etc/apt/sources.list.d/socktop.list</code></pre>
-
-            <h3>Step 3: Install</h3>
-            <pre><code># Update package lists and install
-sudo apt update
-sudo apt install socktop socktop-agent</code></pre>
-
-            <h2>📋 What's Included</h2>
-            <ul>
-                <li>
-                    <strong class="highlight-blue">socktop</strong> - Terminal
-                    UI client for monitoring systems
-                </li>
-                <li>
-                    <strong class="highlight-mauve">socktop-agent</strong> -
-                    Background agent that reports system metrics
-                </li>
-            </ul>
-
-            <div class="note">
-                <strong>Note:</strong> The agent package automatically installs
-                and configures a systemd service. Enable it with:
-                <code>sudo systemctl enable --now socktop-agent</code>
-            </div>
-
-            <h2>🏗️ Supported Architectures</h2>
-            <div>
-                <span class="badge arch">amd64</span>
-                <span class="badge arch">arm64</span>
-                <span class="badge arch">armhf</span>
-                <span class="badge arch">riscv64</span>
-            </div>
-
-            <h2>🔧 Usage</h2>
-            <p>After installation:</p>
-            <pre><code># Start the TUI client
-socktop
-
-# Connect to a remote agent
-socktop ws://hostname:3000
-
-# Start the agent (if not using systemd)
-socktop_agent</code></pre>
-
-            <h2>🔗 Links</h2>
-            <ul>
-                <li>
-                    <a href="https://github.com/jasonwitty/socktop"
-                        >Source Code on GitHub</a
-                    >
-                </li>
-                <li>
-                    <a href="https://github.com/jasonwitty/socktop/issues"
-                        >Report Issues</a
-                    >
-                </li>
-                <li><a href="README.md">Repository Documentation</a></li>
-            </ul>
-
-            <div class="footer">
-                <p>Hosted on GitHub Pages | Packages signed with GPG</p>
-                <p>
-                    Theme:
-                    <a href="https://github.com/catppuccin/catppuccin"
-                        >Catppuccin Frappe</a
-                    >
-                </p>
-            </div>
-        </div>
-
-        <script>
-            // Attach copy buttons to all <pre> blocks and enable copy-to-clipboard.
-            document.addEventListener("DOMContentLoaded", function () {
-                const pres = document.querySelectorAll("pre");
-                pres.forEach((pre) => {
-                    // Create button
-                    const btn = document.createElement("button");
-                    btn.type = "button";
-                    btn.className = "copy-btn";
-                    btn.setAttribute("aria-label", "Copy code to clipboard");
-                    // Use emoji for simplicity; you can replace with SVG if desired
-                    btn.innerText = "📋";
-
-                    // Append to pre
-                    pre.appendChild(btn);
-
-                    // Click handler
-                    btn.addEventListener("click", async (e) => {
-                        e.stopPropagation();
-                        const code = pre.querySelector("code");
-                        const text = code ? code.innerText : pre.innerText;
-                        try {
-                            if (!navigator.clipboard) {
-                                // Fallback method
-                                const textarea =
-                                    document.createElement("textarea");
-                                textarea.value = text;
-                                textarea.style.position = "fixed";
-                                textarea.style.left = "-9999px";
-                                document.body.appendChild(textarea);
-                                textarea.select();
-                                document.execCommand("copy");
-                                document.body.removeChild(textarea);
-                            } else {
-                                await navigator.clipboard.writeText(text);
-                            }
-                            // feedback
-                            btn.classList.add("copied");
-                            const prior = btn.innerText;
-                            btn.innerText = "✓ Copied";
-                            setTimeout(() => {
-                                btn.classList.remove("copied");
-                                btn.innerText = "📋";
-                            }, 1800);
-                        } catch (err) {
-                            btn.innerText = "✖";
-                            setTimeout(() => (btn.innerText = "📋"), 1500);
-                            console.error("Copy failed", err);
-                        }
-                    });
-                });
-            });
-        </script>
-    </body>
-</html>

nohup.out

@@ -0,0 +1,8 @@
+socktop_agent: TLS enabled. Listening on wss://0.0.0.0:8433/ws
+socktop_agent: TLS enabled. Listening on wss://0.0.0.0:8433/ws
+socktop_agent: TLS enabled. Listening on wss://0.0.0.0:8433/ws
+Error: Address already in use (os error 98)
+socktop_agent: TLS enabled. Listening on wss://0.0.0.0:8433/ws
+Error: Address already in use (os error 98)
+socktop_agent: TLS enabled. Listening on wss://0.0.0.0:8443/ws
+socktop_agent: TLS enabled. Listening on wss://0.0.0.0:8443/ws

proto/processes.proto

@@ -0,0 +1,15 @@
+syntax = "proto3";
+package socktop;
+
+// All running processes. Sorting is done client-side.
+message Processes {
+  uint64 process_count = 1;           // total processes in the system
+  repeated Process rows = 2;          // all processes
+}
+
+message Process {
+  uint32 pid = 1;
+  string name = 2;
+  float cpu_usage = 3;                // 0..100
+  uint64 mem_bytes = 4;               // RSS bytes
+}

rust-toolchain.toml

@@ -0,0 +1,3 @@
+[toolchain]
+channel = "stable"
+components = ["clippy", "rustfmt"]

socktop/Cargo.toml

@@ -0,0 +1,32 @@
+[package]
+name = "socktop"
+version = "0.1.3"
+authors = ["Jason Witty <jasonpwitty+socktop@proton.me>"]
+description = "Remote system monitor over WebSocket, TUI like top"
+edition = "2021"
+license = "MIT"
+
+[dependencies]
+tokio = { workspace = true }
+tokio-tungstenite = { workspace = true }
+futures-util = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+url = { workspace = true }
+ratatui = { workspace = true }
+crossterm = { workspace = true }
+anyhow = { workspace = true }
+flate2 = { version = "1", default-features = false, features = ["rust_backend"] }
+dirs-next = { workspace = true }
+sysinfo = { workspace = true }
+rustls = "0.23"
+rustls-pemfile = "2.1"
+prost = { workspace = true }
+
+[dev-dependencies]
+assert_cmd = "2.0"
+tempfile = "3"
+
+[build-dependencies]
+prost-build = "0.13"
+protoc-bin-vendored = "3"

socktop/build.rs

@@ -0,0 +1,14 @@
+fn main() {
+    // Vendored protoc for reproducible builds (works on crates.io build machines)
+    let protoc = protoc_bin_vendored::protoc_bin_path().expect("protoc");
+    std::env::set_var("PROTOC", &protoc);
+
+    // Tell Cargo when to re-run
+    println!("cargo:rerun-if-changed=proto/processes.proto");
+
+    let mut cfg = prost_build::Config::new();
+    cfg.out_dir(std::env::var("OUT_DIR").unwrap());
+    // Use in-crate relative path so `cargo package` includes the file
+    cfg.compile_protos(&["proto/processes.proto"], &["proto"]) // paths relative to CARGO_MANIFEST_DIR
+        .expect("compile protos");
+}

socktop/proto/processes.proto

@@ -0,0 +1,15 @@
+syntax = "proto3";
+package socktop;
+
+// All running processes. Sorting is done client-side.
+message Processes {
+  uint64 process_count = 1;           // total processes in the system
+  repeated Process rows = 2;          // all processes
+}
+
+message Process {
+  uint32 pid = 1;
+  string name = 2;
+  float cpu_usage = 3;                // 0..100
+  uint64 mem_bytes = 4;               // RSS bytes
+}

socktop/src/app.rs

@@ -0,0 +1,511 @@
+//! App state and main loop: input handling, fetching metrics, updating history, and drawing.
+
+use std::{
+    collections::VecDeque,
+    io,
+    time::{Duration, Instant},
+};
+
+use crossterm::{
+    event::{self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode},
+    execute,
+    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
+};
+use ratatui::{
+    backend::CrosstermBackend,
+    layout::{Constraint, Direction, Rect},
+    //style::Color, // + add Color
+    Terminal,
+};
+use tokio::time::sleep;
+
+use crate::history::{push_capped, PerCoreHistory};
+use crate::types::Metrics;
+use crate::ui::cpu::{
+    draw_cpu_avg_graph, draw_per_core_bars, per_core_clamp, per_core_content_area,
+    per_core_handle_key, per_core_handle_mouse, per_core_handle_scrollbar_mouse, PerCoreScrollDrag,
+};
+use crate::ui::processes::{processes_handle_key, processes_handle_mouse, ProcSortBy};
+use crate::ui::{
+    disks::draw_disks, gpu::draw_gpu, header::draw_header, mem::draw_mem, net::draw_net_spark,
+    swap::draw_swap,
+};
+use crate::ws::{connect, request_disks, request_metrics, request_processes};
+
+pub struct App {
+    // Latest metrics + histories
+    last_metrics: Option<Metrics>,
+
+    // CPU avg history (0..100)
+    cpu_hist: VecDeque<u64>,
+
+    // Per-core history (0..100)
+    per_core_hist: PerCoreHistory,
+
+    // Network totals snapshot + histories of KB/s
+    last_net_totals: Option<(u64, u64, Instant)>,
+    rx_hist: VecDeque<u64>,
+    tx_hist: VecDeque<u64>,
+    rx_peak: u64,
+    tx_peak: u64,
+
+    // Quit flag
+    should_quit: bool,
+
+    pub per_core_scroll: usize,
+    pub per_core_drag: Option<PerCoreScrollDrag>, // new: drag state
+    pub procs_scroll_offset: usize,
+    pub procs_drag: Option<PerCoreScrollDrag>,
+    pub procs_sort_by: ProcSortBy,
+    last_procs_area: Option<ratatui::layout::Rect>,
+
+    last_procs_poll: Instant,
+    last_disks_poll: Instant,
+    procs_interval: Duration,
+    disks_interval: Duration,
+    metrics_interval: Duration,
+
+    // For reconnects
+    ws_url: String,
+    // Security / status flags
+    pub is_tls: bool,
+    pub has_token: bool,
+}
+
+impl App {
+    pub fn new() -> Self {
+        Self {
+            last_metrics: None,
+            cpu_hist: VecDeque::with_capacity(600),
+            per_core_hist: PerCoreHistory::new(60),
+            last_net_totals: None,
+            rx_hist: VecDeque::with_capacity(600),
+            tx_hist: VecDeque::with_capacity(600),
+            rx_peak: 0,
+            tx_peak: 0,
+            should_quit: false,
+            per_core_scroll: 0,
+            per_core_drag: None,
+            procs_scroll_offset: 0,
+            procs_drag: None,
+            procs_sort_by: ProcSortBy::CpuDesc,
+            last_procs_area: None,
+            last_procs_poll: Instant::now()
+                .checked_sub(Duration::from_secs(2))
+                .unwrap_or_else(Instant::now), // trigger immediately on first loop
+            last_disks_poll: Instant::now()
+                .checked_sub(Duration::from_secs(5))
+                .unwrap_or_else(Instant::now),
+            procs_interval: Duration::from_secs(2),
+            disks_interval: Duration::from_secs(5),
+            metrics_interval: Duration::from_millis(500),
+            ws_url: String::new(),
+            is_tls: false,
+            has_token: false,
+        }
+    }
+
+    pub fn with_intervals(mut self, metrics_ms: Option<u64>, procs_ms: Option<u64>) -> Self {
+        if let Some(m) = metrics_ms {
+            self.metrics_interval = Duration::from_millis(m.max(100));
+        }
+        if let Some(p) = procs_ms {
+            self.procs_interval = Duration::from_millis(p.max(200));
+        }
+        self
+    }
+
+    pub fn with_status(mut self, is_tls: bool, has_token: bool) -> Self {
+        self.is_tls = is_tls;
+        self.has_token = has_token;
+        self
+    }
+
+    pub async fn run(
+        &mut self,
+        url: &str,
+        tls_ca: Option<&str>,
+    ) -> Result<(), Box<dyn std::error::Error>> {
+        // Connect to agent
+        //let mut ws = connect(url, tls_ca).await?;
+        self.ws_url = url.to_string();
+        let mut ws = connect(url, tls_ca).await?;
+
+        // Terminal setup
+        enable_raw_mode()?;
+        let mut stdout = io::stdout();
+        execute!(stdout, EnterAlternateScreen, EnableMouseCapture)?;
+        let backend = CrosstermBackend::new(stdout);
+        let mut terminal = Terminal::new(backend)?;
+        terminal.clear()?;
+
+        // Main loop
+        let res = self.event_loop(&mut terminal, &mut ws).await;
+
+        // Teardown
+        disable_raw_mode()?;
+        let backend = terminal.backend_mut();
+        execute!(backend, DisableMouseCapture, LeaveAlternateScreen)?;
+        terminal.show_cursor()?;
+
+        res
+    }
+
+    async fn event_loop<B: ratatui::backend::Backend>(
+        &mut self,
+        terminal: &mut Terminal<B>,
+        ws: &mut crate::ws::WsStream,
+    ) -> Result<(), Box<dyn std::error::Error>> {
+        loop {
+            // Input (non-blocking)
+            while event::poll(Duration::from_millis(10))? {
+                match event::read()? {
+                    Event::Key(k) => {
+                        if matches!(
+                            k.code,
+                            KeyCode::Char('q') | KeyCode::Char('Q') | KeyCode::Esc
+                        ) {
+                            self.should_quit = true;
+                        }
+                        // Per-core scroll via keys (Up/Down/PageUp/PageDown/Home/End)
+                        let sz = terminal.size()?;
+                        let area = Rect::new(0, 0, sz.width, sz.height);
+                        let rows = ratatui::layout::Layout::default()
+                            .direction(Direction::Vertical)
+                            .constraints([
+                                Constraint::Length(1),
+                                Constraint::Ratio(1, 3),
+                                Constraint::Length(3),
+                                Constraint::Length(3),
+                                Constraint::Min(10),
+                            ])
+                            .split(area);
+                        let top = ratatui::layout::Layout::default()
+                            .direction(Direction::Horizontal)
+                            .constraints([Constraint::Percentage(66), Constraint::Percentage(34)])
+                            .split(rows[1]);
+                        let content = per_core_content_area(top[1]);
+
+                        per_core_handle_key(&mut self.per_core_scroll, k, content.height as usize);
+
+                        let total_rows = self
+                            .last_metrics
+                            .as_ref()
+                            .map(|mm| mm.cpu_per_core.len())
+                            .unwrap_or(0);
+                        per_core_clamp(
+                            &mut self.per_core_scroll,
+                            total_rows,
+                            content.height as usize,
+                        );
+
+                        if let Some(p_area) = self.last_procs_area {
+                            // page size = visible rows (inner height minus header = 1)
+                            let page = p_area.height.saturating_sub(3).max(1) as usize; // borders (2) + header (1)
+                            processes_handle_key(&mut self.procs_scroll_offset, k, page);
+                        }
+                    }
+                    Event::Mouse(m) => {
+                        // Layout to get areas
+                        let sz = terminal.size()?;
+                        let area = Rect::new(0, 0, sz.width, sz.height);
+                        let rows = ratatui::layout::Layout::default()
+                            .direction(Direction::Vertical)
+                            .constraints([
+                                Constraint::Length(1),
+                                Constraint::Ratio(1, 3),
+                                Constraint::Length(3),
+                                Constraint::Length(3),
+                                Constraint::Min(10),
+                            ])
+                            .split(area);
+                        let top = ratatui::layout::Layout::default()
+                            .direction(Direction::Horizontal)
+                            .constraints([Constraint::Percentage(66), Constraint::Percentage(34)])
+                            .split(rows[1]);
+
+                        // Content wheel scrolling
+                        let content = per_core_content_area(top[1]);
+                        per_core_handle_mouse(
+                            &mut self.per_core_scroll,
+                            m,
+                            content,
+                            content.height as usize,
+                        );
+
+                        // Scrollbar clicks/drag
+                        let total_rows = self
+                            .last_metrics
+                            .as_ref()
+                            .map(|mm| mm.cpu_per_core.len())
+                            .unwrap_or(0);
+                        per_core_handle_scrollbar_mouse(
+                            &mut self.per_core_scroll,
+                            &mut self.per_core_drag,
+                            m,
+                            top[1],
+                            total_rows,
+                        );
+
+                        // Clamp to bounds
+                        per_core_clamp(
+                            &mut self.per_core_scroll,
+                            total_rows,
+                            content.height as usize,
+                        );
+
+                        // Processes table: sort by column on header click
+                        if let (Some(mm), Some(p_area)) =
+                            (self.last_metrics.as_ref(), self.last_procs_area)
+                        {
+                            if let Some(new_sort) = processes_handle_mouse(
+                                &mut self.procs_scroll_offset,
+                                &mut self.procs_drag,
+                                m,
+                                p_area,
+                                mm.top_processes.len(),
+                            ) {
+                                self.procs_sort_by = new_sort;
+                            }
+                        }
+                    }
+                    Event::Resize(_, _) => {}
+                    _ => {}
+                }
+            }
+            if self.should_quit {
+                break;
+            }
+
+            // Fetch and update
+            if let Some(m) = request_metrics(ws).await {
+                self.update_with_metrics(m);
+
+                // Only poll processes every 2s
+                if self.last_procs_poll.elapsed() >= self.procs_interval {
+                    if let Some(procs) = request_processes(ws).await {
+                        if let Some(mm) = self.last_metrics.as_mut() {
+                            mm.top_processes = procs.top_processes;
+                            mm.process_count = Some(procs.process_count);
+                        }
+                    }
+                    self.last_procs_poll = Instant::now();
+                }
+
+                // Only poll disks every 5s
+                if self.last_disks_poll.elapsed() >= self.disks_interval {
+                    if let Some(disks) = request_disks(ws).await {
+                        if let Some(mm) = self.last_metrics.as_mut() {
+                            mm.disks = disks;
+                        }
+                    }
+                    self.last_disks_poll = Instant::now();
+                }
+            }
+
+            // Draw
+            terminal.draw(|f| self.draw(f))?;
+
+            // Tick rate
+            sleep(self.metrics_interval).await;
+        }
+
+        Ok(())
+    }
+
+    fn update_with_metrics(&mut self, mut m: Metrics) {
+        if let Some(prev) = &self.last_metrics {
+            // Preserve slower fields when the fast payload omits them
+            if m.disks.is_empty() {
+                m.disks = prev.disks.clone();
+            }
+            if m.top_processes.is_empty() {
+                m.top_processes = prev.top_processes.clone();
+            }
+            // Preserve total processes count across fast updates
+            if m.process_count.is_none() {
+                m.process_count = prev.process_count;
+            }
+        }
+
+        // CPU avg history
+        let v = m.cpu_total.clamp(0.0, 100.0).round() as u64;
+        push_capped(&mut self.cpu_hist, v, 600);
+
+        // Per-core history (push current samples)
+        self.per_core_hist.ensure_cores(m.cpu_per_core.len());
+        self.per_core_hist.push_samples(&m.cpu_per_core);
+
+        // NET: sum across all ifaces, compute KB/s via elapsed time
+        let now = Instant::now();
+        let rx_total = m.networks.iter().map(|n| n.received).sum::<u64>();
+        let tx_total = m.networks.iter().map(|n| n.transmitted).sum::<u64>();
+        let (rx_kb, tx_kb) = if let Some((prx, ptx, pts)) = self.last_net_totals {
+            let dt = now.duration_since(pts).as_secs_f64().max(1e-6);
+            let rx = ((rx_total.saturating_sub(prx)) as f64 / dt / 1024.0).round() as u64;
+            let tx = ((tx_total.saturating_sub(ptx)) as f64 / dt / 1024.0).round() as u64;
+            (rx, tx)
+        } else {
+            (0, 0)
+        };
+        self.last_net_totals = Some((rx_total, tx_total, now));
+        push_capped(&mut self.rx_hist, rx_kb, 600);
+        push_capped(&mut self.tx_hist, tx_kb, 600);
+        self.rx_peak = self.rx_peak.max(rx_kb);
+        self.tx_peak = self.tx_peak.max(tx_kb);
+
+        // Store merged snapshot
+        self.last_metrics = Some(m);
+    }
+
+    pub fn draw(&mut self, f: &mut ratatui::Frame<'_>) {
+        let area = f.area();
+
+        // Root rows: header, top (cpu avg + per-core), memory, swap, bottom
+        let rows = ratatui::layout::Layout::default()
+            .direction(Direction::Vertical)
+            .constraints([
+                Constraint::Length(1),   // header
+                Constraint::Ratio(1, 3), // top row
+                Constraint::Length(3),   // memory (left) + GPU (right, part 1)
+                Constraint::Length(3),   // swap (left)   + GPU (right, part 2)
+                Constraint::Min(10),     // bottom: disks + net (left), top procs (right)
+            ])
+            .split(area);
+
+        // Header
+        draw_header(
+            f,
+            rows[0],
+            self.last_metrics.as_ref(),
+            self.is_tls,
+            self.has_token,
+            self.metrics_interval,
+            self.procs_interval,
+        );
+
+        // Top row: left CPU avg, right Per-core (full top-right)
+        let top_lr = ratatui::layout::Layout::default()
+            .direction(Direction::Horizontal)
+            .constraints([Constraint::Percentage(66), Constraint::Percentage(34)])
+            .split(rows[1]);
+
+        draw_cpu_avg_graph(f, top_lr[0], &self.cpu_hist, self.last_metrics.as_ref());
+        draw_per_core_bars(
+            f,
+            top_lr[1],
+            self.last_metrics.as_ref(),
+            &self.per_core_hist,
+            self.per_core_scroll,
+        );
+
+        // Memory + Swap rows split into left/right columns
+        let mem_lr = ratatui::layout::Layout::default()
+            .direction(Direction::Horizontal)
+            .constraints([Constraint::Percentage(66), Constraint::Percentage(34)])
+            .split(rows[2]);
+        let swap_lr = ratatui::layout::Layout::default()
+            .direction(Direction::Horizontal)
+            .constraints([Constraint::Percentage(66), Constraint::Percentage(34)])
+            .split(rows[3]);
+
+        // Left: Memory + Swap
+        draw_mem(f, mem_lr[0], self.last_metrics.as_ref());
+        draw_swap(f, swap_lr[0], self.last_metrics.as_ref());
+
+        // Right: GPU spans the same vertical space as Memory + Swap
+        let gpu_area = ratatui::layout::Rect {
+            x: mem_lr[1].x,
+            y: mem_lr[1].y,
+            width: mem_lr[1].width,
+            height: mem_lr[1].height + swap_lr[1].height,
+        };
+        draw_gpu(f, gpu_area, self.last_metrics.as_ref());
+
+        // Bottom area: left = Disks + Network, right = Top Processes
+        let bottom_lr = ratatui::layout::Layout::default()
+            .direction(Direction::Horizontal)
+            .constraints([Constraint::Percentage(60), Constraint::Percentage(40)])
+            .split(rows[4]);
+
+        // Left bottom: Disks + Net stacked (make net panes slightly taller)
+        let left_stack = ratatui::layout::Layout::default()
+            .direction(Direction::Vertical)
+            .constraints([
+                Constraint::Min(4),    // Disks shrink slightly
+                Constraint::Length(5), // Download taller
+                Constraint::Length(5), // Upload taller
+            ])
+            .split(bottom_lr[0]);
+
+        draw_disks(f, left_stack[0], self.last_metrics.as_ref());
+        draw_net_spark(
+            f,
+            left_stack[1],
+            &format!(
+                "Download (KB/s) — now: {} | peak: {}",
+                self.rx_hist.back().copied().unwrap_or(0),
+                self.rx_peak
+            ),
+            &self.rx_hist,
+            ratatui::style::Color::Green,
+        );
+        draw_net_spark(
+            f,
+            left_stack[2],
+            &format!(
+                "Upload (KB/s) — now: {} | peak: {}",
+                self.tx_hist.back().copied().unwrap_or(0),
+                self.tx_peak
+            ),
+            &self.tx_hist,
+            ratatui::style::Color::Blue,
+        );
+
+        // Right bottom: Top Processes fills the column
+        let procs_area = bottom_lr[1];
+        // Cache for input handlers
+        self.last_procs_area = Some(procs_area);
+        crate::ui::processes::draw_top_processes(
+            f,
+            procs_area,
+            self.last_metrics.as_ref(),
+            self.procs_scroll_offset,
+            self.procs_sort_by,
+        );
+    }
+}
+
+impl Default for App {
+    fn default() -> Self {
+        Self {
+            last_metrics: None,
+            cpu_hist: VecDeque::with_capacity(600),
+            per_core_hist: PerCoreHistory::new(60),
+            last_net_totals: None,
+            rx_hist: VecDeque::with_capacity(600),
+            tx_hist: VecDeque::with_capacity(600),
+            rx_peak: 0,
+            tx_peak: 0,
+            should_quit: false,
+            per_core_scroll: 0,
+            per_core_drag: None,
+            procs_scroll_offset: 0,
+            procs_drag: None,
+            procs_sort_by: ProcSortBy::CpuDesc,
+            last_procs_area: None,
+            last_procs_poll: Instant::now()
+                .checked_sub(Duration::from_secs(2))
+                .unwrap_or_else(Instant::now), // trigger immediately on first loop
+            last_disks_poll: Instant::now()
+                .checked_sub(Duration::from_secs(5))
+                .unwrap_or_else(Instant::now),
+            procs_interval: Duration::from_secs(2),
+            disks_interval: Duration::from_secs(5),
+            metrics_interval: Duration::from_millis(500),
+            ws_url: String::new(),
+            is_tls: false,
+            has_token: false,
+        }
+    }
+}

socktop/src/history.rs

@@ -0,0 +1,42 @@
+//! Small utilities to manage bounded history buffers for charts.
+
+use std::collections::VecDeque;
+
+pub fn push_capped<T>(dq: &mut VecDeque<T>, v: T, cap: usize) {
+    if dq.len() == cap {
+        dq.pop_front();
+    }
+    dq.push_back(v);
+}
+
+// Keeps a history deque per core with a fixed capacity
+pub struct PerCoreHistory {
+    pub deques: Vec<VecDeque<u16>>,
+    cap: usize,
+}
+
+impl PerCoreHistory {
+    pub fn new(cap: usize) -> Self {
+        Self {
+            deques: Vec::new(),
+            cap,
+        }
+    }
+
+    // Ensure we have one deque per core; resize on CPU topology changes
+    pub fn ensure_cores(&mut self, n: usize) {
+        if self.deques.len() == n {
+            return;
+        }
+        self.deques = (0..n).map(|_| VecDeque::with_capacity(self.cap)).collect();
+    }
+
+    // Push a new sample set for all cores (values 0..=100)
+    pub fn push_samples(&mut self, samples: &[f32]) {
+        self.ensure_cores(samples.len());
+        for (i, v) in samples.iter().enumerate() {
+            let val = v.clamp(0.0, 100.0).round() as u16;
+            push_capped(&mut self.deques[i], val, self.cap);
+        }
+    }
+}

socktop/src/lib.rs

@@ -0,0 +1,4 @@
+//! Library surface for integration tests and reuse.
+
+pub mod types;
+pub mod ws;

socktop/src/main.rs

@@ -0,0 +1,420 @@
+//! Entry point for the socktop TUI. Parses args and runs the App.
+
+mod app;
+mod history;
+mod profiles;
+mod types;
+mod ui;
+mod ws;
+
+use app::App;
+use profiles::{load_profiles, save_profiles, ProfileEntry, ProfileRequest, ResolveProfile};
+use std::env;
+use std::io::{self, Write};
+
+pub(crate) struct ParsedArgs {
+    url: Option<String>,
+    tls_ca: Option<String>,
+    profile: Option<String>,
+    save: bool,
+    demo: bool,
+    dry_run: bool, // hidden test helper: skip connecting
+    metrics_interval_ms: Option<u64>,
+    processes_interval_ms: Option<u64>,
+    verify_hostname: bool,
+}
+
+pub(crate) fn parse_args<I: IntoIterator<Item = String>>(args: I) -> Result<ParsedArgs, String> {
+    let mut it = args.into_iter();
+    let prog = it.next().unwrap_or_else(|| "socktop".into());
+    let mut url: Option<String> = None;
+    let mut tls_ca: Option<String> = None;
+    let mut profile: Option<String> = None;
+    let mut save = false;
+    let mut demo = false;
+    let mut dry_run = false;
+    let mut metrics_interval_ms: Option<u64> = None;
+    let mut processes_interval_ms: Option<u64> = None;
+    let mut verify_hostname = false;
+    while let Some(arg) = it.next() {
+        match arg.as_str() {
+            "-h" | "--help" => {
+                return Err(format!("Usage: {prog} [--tls-ca CERT_PEM|-t CERT_PEM] [--verify-hostname] [--profile NAME|-P NAME] [--save] [--demo] [--metrics-interval-ms N] [--processes-interval-ms N] [ws://HOST:PORT/ws]\n"));
+            }
+            "--tls-ca" | "-t" => {
+                tls_ca = it.next();
+            }
+            "--verify-hostname" => {
+                // opt-in hostname (SAN) verification
+                // default behavior is to skip it for easier home network usage
+                // (still pins the provided certificate)
+                verify_hostname = true;
+            }
+            "--profile" | "-P" => {
+                profile = it.next();
+            }
+            "--save" => {
+                save = true;
+            }
+            "--demo" => {
+                demo = true;
+            }
+            "--dry-run" => {
+                // intentionally undocumented
+                dry_run = true;
+            }
+            "--metrics-interval-ms" => {
+                metrics_interval_ms = it.next().and_then(|v| v.parse().ok());
+            }
+            "--processes-interval-ms" => {
+                processes_interval_ms = it.next().and_then(|v| v.parse().ok());
+            }
+            _ if arg.starts_with("--tls-ca=") => {
+                if let Some((_, v)) = arg.split_once('=') {
+                    if !v.is_empty() {
+                        tls_ca = Some(v.to_string());
+                    }
+                }
+            }
+            _ if arg.starts_with("--profile=") => {
+                if let Some((_, v)) = arg.split_once('=') {
+                    if !v.is_empty() {
+                        profile = Some(v.to_string());
+                    }
+                }
+            }
+            _ if arg.starts_with("--metrics-interval-ms=") => {
+                if let Some((_, v)) = arg.split_once('=') {
+                    metrics_interval_ms = v.parse().ok();
+                }
+            }
+            _ if arg.starts_with("--processes-interval-ms=") => {
+                if let Some((_, v)) = arg.split_once('=') {
+                    processes_interval_ms = v.parse().ok();
+                }
+            }
+            _ => {
+                if url.is_none() {
+                    url = Some(arg);
+                } else {
+                    return Err(format!("Unexpected argument. Usage: {prog} [--tls-ca CERT_PEM|-t CERT_PEM] [--verify-hostname] [--profile NAME|-P NAME] [--save] [--demo] [ws://HOST:PORT/ws]"));
+                }
+            }
+        }
+    }
+    Ok(ParsedArgs {
+        url,
+        tls_ca,
+        profile,
+        save,
+        demo,
+        dry_run,
+        metrics_interval_ms,
+        processes_interval_ms,
+        verify_hostname,
+    })
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let parsed = match parse_args(env::args()) {
+        Ok(v) => v,
+        Err(msg) => {
+            eprintln!("{msg}");
+            return Ok(());
+        }
+    };
+    if parsed.demo || matches!(parsed.profile.as_deref(), Some("demo")) {
+        return run_demo_mode(parsed.tls_ca.as_deref()).await;
+    }
+    if parsed.verify_hostname {
+        // Set env var consumed by ws::connect logic
+        std::env::set_var("SOCKTOP_VERIFY_NAME", "1");
+    }
+    let profiles_file = load_profiles();
+    let req = ProfileRequest {
+        profile_name: parsed.profile.clone(),
+        url: parsed.url.clone(),
+        tls_ca: parsed.tls_ca.clone(),
+    };
+    let resolved = req.resolve(&profiles_file);
+    let mut profiles_mut = profiles_file.clone();
+    let (url, tls_ca, metrics_interval_ms, processes_interval_ms): (
+        String,
+        Option<String>,
+        Option<u64>,
+        Option<u64>,
+    ) = match resolved {
+        ResolveProfile::Direct(u, t) => {
+            if let Some(name) = parsed.profile.as_ref() {
+                let existing = profiles_mut.profiles.get(name);
+                match existing {
+                    None => {
+                        let (mi, pi) = gather_intervals(
+                            parsed.metrics_interval_ms,
+                            parsed.processes_interval_ms,
+                        )?;
+                        profiles_mut.profiles.insert(
+                            name.clone(),
+                            ProfileEntry {
+                                url: u.clone(),
+                                tls_ca: t.clone(),
+                                metrics_interval_ms: mi,
+                                processes_interval_ms: pi,
+                            },
+                        );
+                        let _ = save_profiles(&profiles_mut);
+                        (u, t, mi, pi)
+                    }
+                    Some(entry) => {
+                        let changed = entry.url != u || entry.tls_ca != t;
+                        if changed {
+                            let overwrite = if parsed.save {
+                                true
+                            } else {
+                                prompt_yes_no(&format!(
+                                    "Overwrite existing profile '{name}'? [y/N]: "
+                                ))
+                            };
+                            if overwrite {
+                                let (mi, pi) = gather_intervals(
+                                    parsed.metrics_interval_ms,
+                                    parsed.processes_interval_ms,
+                                )?;
+                                profiles_mut.profiles.insert(
+                                    name.clone(),
+                                    ProfileEntry {
+                                        url: u.clone(),
+                                        tls_ca: t.clone(),
+                                        metrics_interval_ms: mi,
+                                        processes_interval_ms: pi,
+                                    },
+                                );
+                                let _ = save_profiles(&profiles_mut);
+                                (u, t, mi, pi)
+                            } else {
+                                (u, t, entry.metrics_interval_ms, entry.processes_interval_ms)
+                            }
+                        } else {
+                            (u, t, entry.metrics_interval_ms, entry.processes_interval_ms)
+                        }
+                    }
+                }
+            } else {
+                (
+                    u,
+                    t,
+                    parsed.metrics_interval_ms,
+                    parsed.processes_interval_ms,
+                )
+            }
+        }
+        ResolveProfile::Loaded(u, t) => {
+            let entry = profiles_mut
+                .profiles
+                .get(parsed.profile.as_ref().unwrap())
+                .unwrap();
+            (u, t, entry.metrics_interval_ms, entry.processes_interval_ms)
+        }
+        ResolveProfile::PromptSelect(mut names) => {
+            if !names.iter().any(|n: &String| n == "demo") {
+                names.push("demo".into());
+            }
+            eprintln!("Select profile:");
+            for (i, n) in names.iter().enumerate() {
+                eprintln!("  {}. {}", i + 1, n);
+            }
+            eprint!("Enter number (or blank to abort): ");
+            let _ = io::stderr().flush();
+            let mut line = String::new();
+            if io::stdin().read_line(&mut line).is_ok() {
+                if let Ok(idx) = line.trim().parse::<usize>() {
+                    if idx >= 1 && idx <= names.len() {
+                        let name = &names[idx - 1];
+                        if name == "demo" {
+                            return run_demo_mode(parsed.tls_ca.as_deref()).await;
+                        }
+                        if let Some(entry) = profiles_mut.profiles.get(name) {
+                            (
+                                entry.url.clone(),
+                                entry.tls_ca.clone(),
+                                entry.metrics_interval_ms,
+                                entry.processes_interval_ms,
+                            )
+                        } else {
+                            return Ok(());
+                        }
+                    } else {
+                        return Ok(());
+                    }
+                } else {
+                    return Ok(());
+                }
+            } else {
+                return Ok(());
+            }
+        }
+        ResolveProfile::PromptCreate(name) => {
+            eprintln!("Profile '{name}' does not exist yet.");
+            let url = prompt_string("Enter URL (ws://HOST:PORT/ws or wss://...): ")?;
+            if url.trim().is_empty() {
+                return Ok(());
+            }
+            let ca = prompt_string("Enter TLS CA path (or leave blank): ")?;
+            let ca_opt = if ca.trim().is_empty() {
+                None
+            } else {
+                Some(ca.trim().to_string())
+            };
+            let (mi, pi) =
+                gather_intervals(parsed.metrics_interval_ms, parsed.processes_interval_ms)?;
+            profiles_mut.profiles.insert(
+                name.clone(),
+                ProfileEntry {
+                    url: url.trim().to_string(),
+                    tls_ca: ca_opt.clone(),
+                    metrics_interval_ms: mi,
+                    processes_interval_ms: pi,
+                },
+            );
+            let _ = save_profiles(&profiles_mut);
+            (url.trim().to_string(), ca_opt, mi, pi)
+        }
+        ResolveProfile::None => {
+            //eprintln!("No URL provided and no profiles to select.");
+
+            //first run, no args, no profiles: show welcome message and offer demo mode
+            if profiles_mut.profiles.is_empty() && parsed.url.is_none() {
+                eprintln!("Welcome to socktop!");
+                eprintln!("It looks like this is your first time running the application.");
+                eprintln!("You can connect to a socktop_agent instance to monitor system metrics and processes.");
+                eprintln!("If you don't have an agent running, you can try the demo mode.");
+                if prompt_yes_no("Would you like to start the demo mode now? [Y/n]: ") {
+                    return run_demo_mode(parsed.tls_ca.as_deref()).await;
+                } else {
+                    eprintln!("Aborting. You can run 'socktop --help' for usage information.");
+                    return Ok(());
+                }
+            }
+            return Err("No URL provided and no profiles to select.".into());
+        }
+    };
+
+    let is_tls = url.starts_with("wss://");
+    let has_token = url.contains("token=");
+    let mut app = App::new()
+        .with_intervals(metrics_interval_ms, processes_interval_ms)
+        .with_status(is_tls, has_token);
+    if parsed.dry_run {
+        return Ok(());
+    }
+    app.run(&url, tls_ca.as_deref()).await
+}
+
+fn prompt_yes_no(prompt: &str) -> bool {
+    eprint!("{prompt}");
+    let _ = io::stderr().flush();
+    let mut line = String::new();
+    if io::stdin().read_line(&mut line).is_ok() {
+        matches!(line.trim().to_ascii_lowercase().as_str(), "y" | "yes")
+    } else {
+        false
+    }
+}
+fn prompt_string(prompt: &str) -> io::Result<String> {
+    eprint!("{prompt}");
+    let _ = io::stderr().flush();
+    let mut line = String::new();
+    io::stdin().read_line(&mut line)?;
+    Ok(line)
+}
+
+fn gather_intervals(
+    arg_metrics: Option<u64>,
+    arg_procs: Option<u64>,
+) -> Result<(Option<u64>, Option<u64>), Box<dyn std::error::Error>> {
+    let default_metrics = 500u64;
+    let default_procs = 2000u64;
+    let metrics = match arg_metrics {
+        Some(v) => Some(v),
+        None => {
+            let inp = prompt_string(&format!(
+                "Metrics interval ms (default {default_metrics}, Enter for default): "
+            ))?;
+            let t = inp.trim();
+            if t.is_empty() {
+                Some(default_metrics)
+            } else {
+                Some(t.parse()?)
+            }
+        }
+    };
+    let procs = match arg_procs {
+        Some(v) => Some(v),
+        None => {
+            let inp = prompt_string(&format!(
+                "Processes interval ms (default {default_procs}, Enter for default): "
+            ))?;
+            let t = inp.trim();
+            if t.is_empty() {
+                Some(default_procs)
+            } else {
+                Some(t.parse()?)
+            }
+        }
+    };
+    Ok((metrics, procs))
+}
+
+// Demo mode implementation
+async fn run_demo_mode(_tls_ca: Option<&str>) -> Result<(), Box<dyn std::error::Error>> {
+    let port = 3231;
+    let url = format!("ws://127.0.0.1:{port}/ws");
+    let child = spawn_demo_agent(port)?;
+    let mut app = App::new();
+    tokio::select! { res=app.run(&url,None)=>{ drop(child); res } _=tokio::signal::ctrl_c()=>{ drop(child); Ok(()) } }
+}
+struct DemoGuard {
+    port: u16,
+    child: std::sync::Arc<std::sync::Mutex<Option<std::process::Child>>>,
+}
+impl Drop for DemoGuard {
+    fn drop(&mut self) {
+        if let Some(mut ch) = self.child.lock().unwrap().take() {
+            let _ = ch.kill();
+        }
+        eprintln!("Stopped demo agent on port {}", self.port);
+    }
+}
+fn spawn_demo_agent(port: u16) -> Result<DemoGuard, Box<dyn std::error::Error>> {
+    let candidate = find_agent_executable();
+    let mut cmd = std::process::Command::new(candidate);
+    cmd.arg("--port").arg(port.to_string());
+    cmd.env("SOCKTOP_ENABLE_SSL", "0");
+
+    //JW: do not disable GPU and TEMP in demo mode
+    //cmd.env("SOCKTOP_AGENT_GPU", "0");
+    //cmd.env("SOCKTOP_AGENT_TEMP", "0");
+
+    let child = cmd.spawn()?;
+    std::thread::sleep(std::time::Duration::from_millis(300));
+    Ok(DemoGuard {
+        port,
+        child: std::sync::Arc::new(std::sync::Mutex::new(Some(child))),
+    })
+}
+fn find_agent_executable() -> std::path::PathBuf {
+    if let Ok(exe) = std::env::current_exe() {
+        if let Some(parent) = exe.parent() {
+            #[cfg(windows)]
+            let name = "socktop_agent.exe";
+            #[cfg(not(windows))]
+            let name = "socktop_agent";
+            let candidate = parent.join(name);
+            if candidate.exists() {
+                return candidate;
+            }
+        }
+    }
+    std::path::PathBuf::from("socktop_agent")
+}

socktop/src/profiles.rs

@@ -0,0 +1,102 @@
+//! Connection profiles: load/save simple JSON mapping of profile name -> { url, tls_ca }
+//! Stored under XDG config dir: $XDG_CONFIG_HOME/socktop/profiles.json (fallback ~/.config/socktop/profiles.json)
+
+use serde::{Deserialize, Serialize};
+use std::{collections::BTreeMap, fs, path::PathBuf};
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct ProfileEntry {
+    pub url: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub tls_ca: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub metrics_interval_ms: Option<u64>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub processes_interval_ms: Option<u64>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct ProfilesFile {
+    #[serde(default)]
+    pub profiles: BTreeMap<String, ProfileEntry>,
+    #[serde(default)]
+    pub version: u32,
+}
+
+pub fn config_dir() -> PathBuf {
+    if let Some(xdg) = std::env::var_os("XDG_CONFIG_HOME") {
+        PathBuf::from(xdg).join("socktop")
+    } else {
+        dirs_next::config_dir()
+            .unwrap_or_else(|| PathBuf::from("."))
+            .join("socktop")
+    }
+}
+
+pub fn profiles_path() -> PathBuf {
+    config_dir().join("profiles.json")
+}
+
+pub fn load_profiles() -> ProfilesFile {
+    let path = profiles_path();
+    match fs::read_to_string(&path) {
+        Ok(s) => serde_json::from_str(&s).unwrap_or_default(),
+        Err(_) => ProfilesFile::default(),
+    }
+}
+
+pub fn save_profiles(p: &ProfilesFile) -> std::io::Result<()> {
+    let path = profiles_path();
+    if let Some(parent) = path.parent() {
+        fs::create_dir_all(parent)?;
+    }
+    let data = serde_json::to_vec_pretty(p).expect("serialize profiles");
+    fs::write(path, data)
+}
+
+pub enum ResolveProfile {
+    /// Use the provided runtime inputs (not persisted). (url, tls_ca)
+    Direct(String, Option<String>),
+    /// Loaded from existing profile entry (url, tls_ca)
+    Loaded(String, Option<String>),
+    /// Should prompt user to select among profile names
+    PromptSelect(Vec<String>),
+    /// Should prompt user to create a new profile (name)
+    PromptCreate(String),
+    /// No profile could be resolved (e.g., missing arguments)
+    None,
+}
+
+pub struct ProfileRequest {
+    pub profile_name: Option<String>,
+    pub url: Option<String>,
+    pub tls_ca: Option<String>,
+}
+
+impl ProfileRequest {
+    pub fn resolve(self, pf: &ProfilesFile) -> ResolveProfile {
+        // Case: only profile name given -> try load
+        if self.url.is_none() && self.profile_name.is_some() {
+            let name = self.profile_name.unwrap();
+            if let Some(entry) = pf.profiles.get(&name) {
+                return ResolveProfile::Loaded(entry.url.clone(), entry.tls_ca.clone());
+            } else {
+                return ResolveProfile::PromptCreate(name);
+            }
+        }
+        // Both provided -> direct (maybe later saved by caller)
+        if let Some(u) = self.url {
+            return ResolveProfile::Direct(u, self.tls_ca);
+        }
+        // Nothing provided -> maybe prompt select if profiles exist
+        if self.url.is_none() && self.profile_name.is_none() {
+            if pf.profiles.is_empty() {
+                ResolveProfile::None
+            } else {
+                ResolveProfile::PromptSelect(pf.profiles.keys().cloned().collect())
+            }
+        } else {
+            ResolveProfile::None
+        }
+    }
+}

socktop/src/types.rs

@@ -0,0 +1,78 @@
+//! Types that mirror the agent's JSON schema.
+
+use serde::Deserialize;
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct ProcessInfo {
+    pub pid: u32,
+    pub name: String,
+    pub cpu_usage: f32,
+    pub mem_bytes: u64,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct DiskInfo {
+    pub name: String,
+    pub total: u64,
+    pub available: u64,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct NetworkInfo {
+    #[allow(dead_code)]
+    pub name: String,
+    pub received: u64,
+    pub transmitted: u64,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct GpuInfo {
+    pub name: Option<String>,
+    #[allow(dead_code)]
+    pub vendor: Option<String>,
+
+    // Accept both the new and legacy keys
+    #[serde(
+        default,
+        alias = "utilization_gpu_pct",
+        alias = "gpu_util_pct",
+        alias = "gpu_utilization"
+    )]
+    pub utilization: Option<f32>,
+
+    #[serde(default, alias = "mem_used_bytes", alias = "vram_used_bytes")]
+    pub mem_used: Option<u64>,
+
+    #[serde(default, alias = "mem_total_bytes", alias = "vram_total_bytes")]
+    pub mem_total: Option<u64>,
+
+    #[allow(dead_code)]
+    #[serde(default, alias = "temp_c", alias = "temperature_c")]
+    pub temperature: Option<f32>,
+}
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct Metrics {
+    pub cpu_total: f32,
+    pub cpu_per_core: Vec<f32>,
+    pub mem_total: u64,
+    pub mem_used: u64,
+    pub swap_total: u64,
+    pub swap_used: u64,
+    pub hostname: String,
+    pub cpu_temp_c: Option<f32>,
+    pub disks: Vec<DiskInfo>,
+    pub networks: Vec<NetworkInfo>,
+    pub top_processes: Vec<ProcessInfo>,
+    pub gpus: Option<Vec<GpuInfo>>,
+    // New: keep the last reported total process count
+    #[serde(default)]
+    pub process_count: Option<usize>,
+}
+
+#[allow(dead_code)]
+#[derive(Debug, Clone, Deserialize)]
+pub struct ProcessesPayload {
+    pub process_count: usize,
+    pub top_processes: Vec<ProcessInfo>,
+}

socktop/src/ui/cpu.rs

@@ -0,0 +1,393 @@
+//! CPU average sparkline + per-core mini bars.
+
+use crate::ui::theme::{SB_ARROW, SB_THUMB, SB_TRACK};
+use crossterm::event::{KeyCode, KeyEvent, MouseButton, MouseEvent, MouseEventKind};
+use ratatui::style::Modifier;
+use ratatui::style::{Color, Style};
+use ratatui::{
+    layout::{Constraint, Direction, Layout, Rect},
+    text::{Line, Span},
+    widgets::{Block, Borders, Paragraph, Sparkline},
+};
+
+use crate::history::PerCoreHistory;
+use crate::types::Metrics;
+
+/// State for dragging the scrollbar thumb
+#[derive(Clone, Copy, Debug, Default)]
+pub struct PerCoreScrollDrag {
+    pub active: bool,
+    pub start_y: u16,     // mouse row where drag started
+    pub start_top: usize, // thumb top (in track rows) at drag start
+}
+
+/// Returns the content area for per-core CPU bars, excluding borders and reserving space for scrollbar.
+pub fn per_core_content_area(area: Rect) -> Rect {
+    // Inner minus borders
+    let inner = Rect {
+        x: area.x + 1,
+        y: area.y + 1,
+        width: area.width.saturating_sub(2),
+        height: area.height.saturating_sub(2),
+    };
+    // Reserve 1 column on the right for a gutter and 1 for the scrollbar
+    Rect {
+        x: inner.x,
+        y: inner.y,
+        width: inner.width.saturating_sub(2),
+        height: inner.height,
+    }
+}
+
+/// Handles key events for per-core CPU bars.
+pub fn per_core_handle_key(scroll_offset: &mut usize, key: KeyEvent, page_size: usize) {
+    match key.code {
+        KeyCode::Up => *scroll_offset = scroll_offset.saturating_sub(1),
+        KeyCode::Down => *scroll_offset = scroll_offset.saturating_add(1),
+        KeyCode::PageUp => {
+            let step = page_size.max(1);
+            *scroll_offset = scroll_offset.saturating_sub(step);
+        }
+        KeyCode::PageDown => {
+            let step = page_size.max(1);
+            *scroll_offset = scroll_offset.saturating_add(step);
+        }
+        KeyCode::Home => *scroll_offset = 0,
+        KeyCode::End => *scroll_offset = usize::MAX, // draw() clamps to max
+        _ => {}
+    }
+}
+
+/// Handles mouse wheel over the content.
+pub fn per_core_handle_mouse(
+    scroll_offset: &mut usize,
+    mouse: MouseEvent,
+    content_area: Rect,
+    page_size: usize,
+) {
+    let inside = mouse.column >= content_area.x
+        && mouse.column < content_area.x + content_area.width
+        && mouse.row >= content_area.y
+        && mouse.row < content_area.y + content_area.height;
+
+    if !inside {
+        return;
+    }
+
+    match mouse.kind {
+        MouseEventKind::ScrollUp => *scroll_offset = scroll_offset.saturating_sub(1),
+        MouseEventKind::ScrollDown => *scroll_offset = scroll_offset.saturating_add(1),
+        // Optional paging via horizontal wheel
+        MouseEventKind::ScrollLeft => {
+            let step = page_size.max(1);
+            *scroll_offset = scroll_offset.saturating_sub(step);
+        }
+        MouseEventKind::ScrollRight => {
+            let step = page_size.max(1);
+            *scroll_offset = scroll_offset.saturating_add(step);
+        }
+        _ => {}
+    }
+}
+
+/// Handles mouse interaction with the scrollbar itself (click arrows/page/drag).
+pub fn per_core_handle_scrollbar_mouse(
+    scroll_offset: &mut usize,
+    drag: &mut Option<PerCoreScrollDrag>,
+    mouse: MouseEvent,
+    per_core_area: Rect,
+    total_rows: usize,
+) {
+    // Geometry
+    let inner = Rect {
+        x: per_core_area.x + 1,
+        y: per_core_area.y + 1,
+        width: per_core_area.width.saturating_sub(2),
+        height: per_core_area.height.saturating_sub(2),
+    };
+    if inner.height < 3 || inner.width < 1 {
+        return;
+    }
+    let content = Rect {
+        x: inner.x,
+        y: inner.y,
+        width: inner.width.saturating_sub(2),
+        height: inner.height,
+    };
+    let scroll_area = Rect {
+        x: inner.x + inner.width.saturating_sub(1),
+        y: inner.y,
+        width: 1,
+        height: inner.height,
+    };
+    let viewport_rows = content.height as usize;
+    let total = total_rows.max(1);
+    let view = viewport_rows.clamp(1, total);
+    let max_off = total.saturating_sub(view);
+    let mut offset = (*scroll_offset).min(max_off);
+
+    // Track and current thumb
+    let track = (scroll_area.height - 2) as usize;
+    if track == 0 {
+        return;
+    }
+    let thumb_len = (track * view).div_ceil(total).max(1).min(track);
+    let top_for_offset = |off: usize| -> usize {
+        if max_off == 0 {
+            0
+        } else {
+            ((track - thumb_len) * off + max_off / 2) / max_off
+        }
+    };
+    let thumb_top = top_for_offset(offset);
+
+    let inside_scrollbar = mouse.column == scroll_area.x
+        && mouse.row >= scroll_area.y
+        && mouse.row < scroll_area.y + scroll_area.height;
+
+    // Helper to page
+    let page_up = || offset.saturating_sub(view.max(1));
+    let page_down = || offset.saturating_add(view.max(1));
+
+    match mouse.kind {
+        MouseEventKind::Down(MouseButton::Left) if inside_scrollbar => {
+            // Where within the track?
+            let row = mouse.row;
+            if row == scroll_area.y {
+                // Top arrow
+                offset = offset.saturating_sub(1);
+            } else if row + 1 == scroll_area.y + scroll_area.height {
+                // Bottom arrow
+                offset = offset.saturating_add(1);
+            } else {
+                // Inside track
+                let rel = (row - (scroll_area.y + 1)) as usize;
+                let thumb_end = thumb_top + thumb_len;
+                if rel < thumb_top {
+                    // Page up
+                    offset = page_up();
+                } else if rel >= thumb_end {
+                    // Page down
+                    offset = page_down();
+                } else {
+                    // Start dragging
+                    *drag = Some(PerCoreScrollDrag {
+                        active: true,
+                        start_y: row,
+                        start_top: thumb_top,
+                    });
+                }
+            }
+        }
+        MouseEventKind::Drag(MouseButton::Left) => {
+            if let Some(mut d) = drag.take() {
+                if d.active {
+                    let dy = (mouse.row as i32) - (d.start_y as i32);
+                    let new_top = (d.start_top as i32 + dy)
+                        .clamp(0, (track.saturating_sub(thumb_len)) as i32)
+                        as usize;
+                    // Inverse mapping top -> offset
+                    if track > thumb_len {
+                        let denom = track - thumb_len;
+                        offset = if max_off == 0 {
+                            0
+                        } else {
+                            (new_top * max_off + denom / 2) / denom
+                        };
+                    } else {
+                        offset = 0;
+                    }
+                    // Keep dragging
+                    d.start_top = new_top;
+                    d.start_y = mouse.row;
+                    *drag = Some(d);
+                }
+            }
+        }
+        MouseEventKind::Up(MouseButton::Left) => {
+            // End drag
+            *drag = None;
+        }
+        // Also allow wheel scrolling when cursor is over the scrollbar
+        MouseEventKind::ScrollUp if inside_scrollbar => {
+            offset = offset.saturating_sub(1);
+        }
+        MouseEventKind::ScrollDown if inside_scrollbar => {
+            offset = offset.saturating_add(1);
+        }
+        _ => {}
+    }
+
+    // Clamp and write back
+    if offset > max_off {
+        offset = max_off;
+    }
+    *scroll_offset = offset;
+}
+
+/// Clamp scroll offset to the valid range given content and viewport.
+pub fn per_core_clamp(scroll_offset: &mut usize, total_rows: usize, viewport_rows: usize) {
+    let max_offset = total_rows.saturating_sub(viewport_rows);
+    if *scroll_offset > max_offset {
+        *scroll_offset = max_offset;
+    }
+}
+
+/// Draws the CPU average sparkline graph.
+pub fn draw_cpu_avg_graph(
+    f: &mut ratatui::Frame<'_>,
+    area: Rect,
+    hist: &std::collections::VecDeque<u64>,
+    m: Option<&Metrics>,
+) {
+    let title = if let Some(mm) = m {
+        format!("CPU avg (now: {:>5.1}%)", mm.cpu_total)
+    } else {
+        "CPU avg".into()
+    };
+    let max_points = area.width.saturating_sub(2) as usize;
+    let start = hist.len().saturating_sub(max_points);
+    let data: Vec<u64> = hist.iter().skip(start).cloned().collect();
+    let spark = Sparkline::default()
+        .block(Block::default().borders(Borders::ALL).title(title))
+        .data(&data)
+        .max(100)
+        .style(Style::default().fg(Color::Cyan));
+    f.render_widget(spark, area);
+}
+
+/// Draws the per-core CPU bars with sparklines and trends.
+pub fn draw_per_core_bars(
+    f: &mut ratatui::Frame<'_>,
+    area: Rect,
+    m: Option<&Metrics>,
+    per_core_hist: &PerCoreHistory,
+    scroll_offset: usize,
+) {
+    f.render_widget(
+        Block::default().borders(Borders::ALL).title("Per-core"),
+        area,
+    );
+    let Some(mm) = m else {
+        return;
+    };
+
+    // Compute inner rect and content area
+    let inner = Rect {
+        x: area.x + 1,
+        y: area.y + 1,
+        width: area.width.saturating_sub(2),
+        height: area.height.saturating_sub(2),
+    };
+    if inner.height == 0 || inner.width <= 2 {
+        return;
+    }
+    let content = Rect {
+        x: inner.x,
+        y: inner.y,
+        width: inner.width.saturating_sub(2),
+        height: inner.height,
+    };
+
+    let total_rows = mm.cpu_per_core.len();
+    let viewport_rows = content.height as usize;
+    let max_offset = total_rows.saturating_sub(viewport_rows);
+    let offset = scroll_offset.min(max_offset);
+    let show_n = total_rows.saturating_sub(offset).min(viewport_rows);
+
+    let constraints: Vec<Constraint> = (0..show_n).map(|_| Constraint::Length(1)).collect();
+    let vchunks = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints(constraints)
+        .split(content);
+
+    for i in 0..show_n {
+        let idx = offset + i;
+        let rect = vchunks[i];
+        let hchunks = Layout::default()
+            .direction(Direction::Horizontal)
+            .constraints([Constraint::Min(6), Constraint::Length(12)])
+            .split(rect);
+
+        let curr = mm.cpu_per_core[idx].clamp(0.0, 100.0);
+        let older = per_core_hist
+            .deques
+            .get(idx)
+            .and_then(|d| d.iter().rev().nth(20).copied())
+            .map(|v| v as f32)
+            .unwrap_or(curr);
+
+        let trend = if curr > older + 0.2 {
+            "↑"
+        } else if curr + 0.2 < older {
+            "↓"
+        } else {
+            "╌"
+        };
+
+        let fg = match curr {
+            x if x < 25.0 => Color::Green,
+            x if x < 60.0 => Color::Yellow,
+            _ => Color::Red,
+        };
+
+        let hist: Vec<u64> = per_core_hist
+            .deques
+            .get(idx)
+            .map(|d| {
+                let max_points = hchunks[0].width as usize;
+                let start = d.len().saturating_sub(max_points);
+                d.iter().skip(start).map(|&v| v as u64).collect()
+            })
+            .unwrap_or_default();
+
+        let spark = Sparkline::default()
+            .data(&hist)
+            .max(100)
+            .style(Style::default().fg(fg));
+
+        f.render_widget(spark, hchunks[0]);
+
+        let label = format!("cpu{idx:<2}{trend}{curr:>5.1}%");
+        let line = Line::from(Span::styled(
+            label,
+            Style::default().fg(fg).add_modifier(Modifier::BOLD),
+        ));
+        f.render_widget(Paragraph::new(line).right_aligned(), hchunks[1]);
+    }
+
+    // Custom 1-col scrollbar with arrows, track, and exact mapping
+    let scroll_area = Rect {
+        x: inner.x + inner.width.saturating_sub(1),
+        y: inner.y,
+        width: 1,
+        height: inner.height,
+    };
+    if scroll_area.height >= 3 {
+        let track = (scroll_area.height - 2) as usize;
+        let total = total_rows.max(1);
+        let view = viewport_rows.clamp(1, total);
+        let max_off = total.saturating_sub(view);
+
+        let thumb_len = (track * view).div_ceil(total).max(1).min(track);
+        let thumb_top = if max_off == 0 {
+            0
+        } else {
+            ((track - thumb_len) * offset + max_off / 2) / max_off
+        };
+
+        // Build lines: top arrow, track (with thumb), bottom arrow
+        let mut lines: Vec<Line> = Vec::with_capacity(scroll_area.height as usize);
+        lines.push(Line::from(Span::styled("▲", Style::default().fg(SB_ARROW))));
+        for i in 0..track {
+            if i >= thumb_top && i < thumb_top + thumb_len {
+                lines.push(Line::from(Span::styled("█", Style::default().fg(SB_THUMB))));
+            } else {
+                lines.push(Line::from(Span::styled("│", Style::default().fg(SB_TRACK))));
+            }
+        }
+        lines.push(Line::from(Span::styled("▼", Style::default().fg(SB_ARROW))));
+
+        f.render_widget(Paragraph::new(lines), scroll_area);
+    }
+}

socktop/src/ui/disks.rs

@@ -0,0 +1,91 @@
+//! Disk cards with per-device gauge and title line.
+
+use crate::types::Metrics;
+use crate::ui::util::{disk_icon, human, truncate_middle};
+use ratatui::{
+    layout::{Constraint, Direction, Layout, Rect},
+    style::Style,
+    widgets::{Block, Borders, Gauge},
+};
+
+pub fn draw_disks(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Metrics>) {
+    f.render_widget(Block::default().borders(Borders::ALL).title("Disks"), area);
+    let Some(mm) = m else {
+        return;
+    };
+
+    let inner = Rect {
+        x: area.x + 1,
+        y: area.y + 1,
+        width: area.width.saturating_sub(2),
+        height: area.height.saturating_sub(2),
+    };
+    if inner.height < 3 {
+        return;
+    }
+
+    let per_disk_h = 3u16;
+    let max_cards = (inner.height / per_disk_h).min(mm.disks.len() as u16) as usize;
+
+    let constraints: Vec<Constraint> = (0..max_cards)
+        .map(|_| Constraint::Length(per_disk_h))
+        .collect();
+    let rows = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints(constraints)
+        .split(inner);
+
+    for (i, slot) in rows.iter().enumerate() {
+        let d = &mm.disks[i];
+        let used = d.total.saturating_sub(d.available);
+        let ratio = if d.total > 0 {
+            used as f64 / d.total as f64
+        } else {
+            0.0
+        };
+        let pct = (ratio * 100.0).round() as u16;
+
+        let color = if pct < 70 {
+            ratatui::style::Color::Green
+        } else if pct < 90 {
+            ratatui::style::Color::Yellow
+        } else {
+            ratatui::style::Color::Red
+        };
+
+        let title = format!(
+            "{} {}   {} / {}  ({}%)",
+            disk_icon(&d.name),
+            truncate_middle(&d.name, (slot.width.saturating_sub(6)) as usize / 2),
+            human(used),
+            human(d.total),
+            pct
+        );
+
+        let card = Block::default().borders(Borders::ALL).title(title);
+        f.render_widget(card, *slot);
+
+        let inner_card = Rect {
+            x: slot.x + 1,
+            y: slot.y + 1,
+            width: slot.width.saturating_sub(2),
+            height: slot.height.saturating_sub(2),
+        };
+        if inner_card.height == 0 {
+            continue;
+        }
+
+        let gauge_rect = Rect {
+            x: inner_card.x,
+            y: inner_card.y + inner_card.height / 2,
+            width: inner_card.width,
+            height: 1,
+        };
+
+        let g = Gauge::default()
+            .percent(pct)
+            .gauge_style(Style::default().fg(color));
+
+        f.render_widget(g, gauge_rect);
+    }
+}

socktop/src/ui/gpu.rs

@@ -0,0 +1,123 @@
+use ratatui::{
+    layout::{Constraint, Direction, Layout, Rect},
+    style::{Color, Style},
+    text::Span,
+    widgets::{Block, Borders, Gauge, Paragraph},
+};
+
+use crate::types::Metrics;
+
+fn fmt_bytes(b: u64) -> String {
+    const KB: f64 = 1024.0;
+    const MB: f64 = KB * 1024.0;
+    const GB: f64 = MB * 1024.0;
+    let fb = b as f64;
+
+    if fb >= GB {
+        format!("{:.1}G", fb / GB)
+    } else if fb >= MB {
+        format!("{:.1}M", fb / MB)
+    } else if fb >= KB {
+        format!("{:.1}K", fb / KB)
+    } else {
+        format!("{b}B")
+    }
+}
+
+pub fn draw_gpu(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Metrics>) {
+    let mut area = area;
+    let block = Block::default().borders(Borders::ALL).title("GPU");
+    f.render_widget(block, area);
+
+    // Guard: need some space inside the block
+    if area.height <= 2 || area.width <= 2 {
+        return;
+    }
+
+    // Inner padding consistent with the rest of the app
+    area.y += 1;
+    area.height = area.height.saturating_sub(2);
+    area.x += 1;
+    area.width = area.width.saturating_sub(2);
+
+    let Some(metrics) = m else {
+        return;
+    };
+
+    let Some(gpus) = metrics.gpus.as_ref() else {
+        f.render_widget(Paragraph::new("No GPUs"), area);
+        return;
+    };
+    if gpus.is_empty() {
+        f.render_widget(Paragraph::new("No GPUs"), area);
+        return;
+    }
+
+    // Show 3 rows per GPU: name, util bar, vram bar.
+    if area.height < 3 {
+        return;
+    }
+    let per_gpu_rows: u16 = 3;
+    let max_gpus = (area.height / per_gpu_rows) as usize;
+    let count = gpus.len().min(max_gpus);
+
+    let constraints = vec![Constraint::Length(1); count * per_gpu_rows as usize];
+    let rows = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints(constraints)
+        .split(area);
+
+    // Per bar horizontal layout: [gauge] [value]
+    let split_bar = |r: Rect| {
+        Layout::default()
+            .direction(Direction::Horizontal)
+            .constraints([
+                Constraint::Min(8),     // gauge column
+                Constraint::Length(24), // value column
+            ])
+            .split(r)
+    };
+
+    for i in 0..count {
+        let g = &gpus[i];
+
+        // Row 1: GPU name
+        let name_text = g.name.as_deref().unwrap_or("GPU");
+        let name_p = Paragraph::new(Span::raw(name_text)).style(Style::default().fg(Color::Gray));
+        f.render_widget(name_p, rows[i * 3]);
+
+        // Row 2: Utilization bar + right label
+        let util_cols = split_bar(rows[i * 3 + 1]);
+        let util = g.utilization.unwrap_or(0.0).clamp(0.0, 100.0) as u16;
+        let util_gauge = Gauge::default()
+            .gauge_style(Style::default().fg(Color::Green))
+            .label(Span::raw(""))
+            .ratio(util as f64 / 100.0);
+        f.render_widget(util_gauge, util_cols[0]);
+        f.render_widget(
+            Paragraph::new(Span::raw(format!("util: {util}%")))
+                .style(Style::default().fg(Color::Gray)),
+            util_cols[1],
+        );
+
+        // Row 3: VRAM bar + right label
+        let mem_cols = split_bar(rows[i * 3 + 2]);
+        let used = g.mem_used.unwrap_or(0);
+        let total = g.mem_total.unwrap_or(1);
+        let mem_ratio = used as f64 / total as f64;
+        let mem_pct = (mem_ratio * 100.0).round() as u16;
+
+        let mem_gauge = Gauge::default()
+            .gauge_style(Style::default().fg(Color::LightMagenta))
+            .label(Span::raw(""))
+            .ratio(mem_ratio);
+        f.render_widget(mem_gauge, mem_cols[0]);
+        let used_s = fmt_bytes(used);
+        let total_s = fmt_bytes(total);
+        f.render_widget(
+            Paragraph::new(Span::raw(format!("vram: {used_s}/{total_s} ({mem_pct}%)")))
+                .style(Style::default().fg(Color::Gray)),
+            mem_cols[1],
+        );
+    }
+}

socktop/src/ui/header.rs

@@ -0,0 +1,52 @@
+//! Top header with hostname and CPU temperature indicator.
+
+use crate::types::Metrics;
+use ratatui::{
+    layout::Rect,
+    widgets::{Block, Borders},
+};
+use std::time::Duration;
+
+pub fn draw_header(
+    f: &mut ratatui::Frame<'_>,
+    area: Rect,
+    m: Option<&Metrics>,
+    is_tls: bool,
+    has_token: bool,
+    metrics_interval: Duration,
+    procs_interval: Duration,
+) {
+    let base = if let Some(mm) = m {
+        let temp = mm
+            .cpu_temp_c
+            .map(|t| {
+                let icon = if t < 50.0 {
+                    "😎"
+                } else if t < 85.0 {
+                    "⚠️"
+                } else {
+                    "🔥"
+                };
+                format!("CPU Temp: {t:.1}°C {icon}")
+            })
+            .unwrap_or_else(|| "CPU Temp: N/A".into());
+        format!("socktop — host: {} | {}", mm.hostname, temp)
+    } else {
+        "socktop — connecting...".into()
+    };
+    // TLS indicator: lock vs lock with cross (using ✗). Keep explicit label for clarity.
+    let tls_txt = if is_tls { "🔒 TLS" } else { "🔒✗ TLS" };
+    // Token indicator
+    let tok_txt = if has_token { "🔑 token" } else { "" };
+    let mi = metrics_interval.as_millis();
+    let pi = procs_interval.as_millis();
+    let intervals = format!("⏱  {mi}ms metrics | {pi}ms procs");
+    let mut parts = vec![base, tls_txt.into()];
+    if !tok_txt.is_empty() {
+        parts.push(tok_txt.into());
+    }
+    parts.push(intervals);
+    parts.push("(q to quit)".into());
+    let title = parts.join(" | ");
+    f.render_widget(Block::default().title(title).borders(Borders::BOTTOM), area);
+}

socktop/src/ui/mem.rs

@@ -0,0 +1,29 @@
+//! Memory gauge.
+
+use crate::types::Metrics;
+use crate::ui::util::human;
+use ratatui::{
+    layout::Rect,
+    style::{Color, Style},
+    widgets::{Block, Borders, Gauge},
+};
+
+pub fn draw_mem(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Metrics>) {
+    let (used, total, pct) = if let Some(mm) = m {
+        let pct = if mm.mem_total > 0 {
+            (mm.mem_used as f64 / mm.mem_total as f64 * 100.0) as u16
+        } else {
+            0
+        };
+        (mm.mem_used, mm.mem_total, pct)
+    } else {
+        (0, 0, 0)
+    };
+
+    let g = Gauge::default()
+        .block(Block::default().borders(Borders::ALL).title("Memory"))
+        .gauge_style(Style::default().fg(Color::Magenta))
+        .percent(pct)
+        .label(format!("{} / {}", human(used), human(total)));
+    f.render_widget(g, area);
+}

socktop/src/ui/mod.rs

@@ -0,0 +1,12 @@
+//! UI module root: exposes drawing functions for individual panels.
+
+pub mod cpu;
+pub mod disks;
+pub mod gpu;
+pub mod header;
+pub mod mem;
+pub mod net;
+pub mod processes;
+pub mod swap;
+pub mod theme;
+pub mod util;

socktop/src/ui/net.rs

@@ -0,0 +1,30 @@
+//! Network sparklines (download/upload).
+
+use ratatui::{
+    layout::Rect,
+    style::{Color, Style},
+    widgets::{Block, Borders, Sparkline},
+};
+use std::collections::VecDeque;
+
+pub fn draw_net_spark(
+    f: &mut ratatui::Frame<'_>,
+    area: Rect,
+    title: &str,
+    hist: &VecDeque<u64>,
+    color: Color,
+) {
+    let max_points = area.width.saturating_sub(2) as usize;
+    let start = hist.len().saturating_sub(max_points);
+    let data: Vec<u64> = hist.iter().skip(start).cloned().collect();
+
+    let spark = Sparkline::default()
+        .block(
+            Block::default()
+                .borders(Borders::ALL)
+                .title(title.to_string()),
+        )
+        .data(&data)
+        .style(Style::default().fg(color));
+    f.render_widget(spark, area);
+}

socktop/src/ui/processes.rs

@@ -0,0 +1,266 @@
+//! Top processes table with per-cell coloring, zebra striping, sorting, and a scrollbar.
+
+use crossterm::event::{MouseButton, MouseEvent, MouseEventKind};
+use ratatui::style::Modifier;
+use ratatui::{
+    layout::{Constraint, Direction, Layout, Rect},
+    style::{Color, Style},
+    text::{Line, Span},
+    widgets::{Block, Borders, Paragraph, Table},
+};
+use std::cmp::Ordering;
+
+use crate::types::Metrics;
+use crate::ui::cpu::{per_core_clamp, per_core_handle_scrollbar_mouse};
+use crate::ui::theme::{SB_ARROW, SB_THUMB, SB_TRACK};
+use crate::ui::util::human;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+pub enum ProcSortBy {
+    #[default]
+    CpuDesc,
+    MemDesc,
+}
+
+// Keep the original header widths here so drawing and hit-testing match.
+const COLS: [Constraint; 5] = [
+    Constraint::Length(8),      // PID
+    Constraint::Percentage(40), // Name
+    Constraint::Length(8),      // CPU %
+    Constraint::Length(12),     // Mem
+    Constraint::Length(8),      // Mem %
+];
+
+pub fn draw_top_processes(
+    f: &mut ratatui::Frame<'_>,
+    area: Rect,
+    m: Option<&Metrics>,
+    scroll_offset: usize,
+    sort_by: ProcSortBy,
+) {
+    // Draw outer block and title
+    let Some(mm) = m else { return };
+    let total = mm.process_count.unwrap_or(mm.top_processes.len());
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(format!("Top Processes ({total} total)"));
+    f.render_widget(block, area);
+
+    // Inner area and content area (reserve 2 columns for scrollbar)
+    let inner = Rect {
+        x: area.x + 1,
+        y: area.y + 1,
+        width: area.width.saturating_sub(2),
+        height: area.height.saturating_sub(2),
+    };
+    if inner.height < 1 || inner.width < 3 {
+        return;
+    }
+    let content = Rect {
+        x: inner.x,
+        y: inner.y,
+        width: inner.width.saturating_sub(2),
+        height: inner.height,
+    };
+
+    // Sort rows (by CPU% or Mem bytes), descending.
+    let mut idxs: Vec<usize> = (0..mm.top_processes.len()).collect();
+    match sort_by {
+        ProcSortBy::CpuDesc => idxs.sort_by(|&a, &b| {
+            let aa = mm.top_processes[a].cpu_usage;
+            let bb = mm.top_processes[b].cpu_usage;
+            bb.partial_cmp(&aa).unwrap_or(Ordering::Equal)
+        }),
+        ProcSortBy::MemDesc => idxs.sort_by(|&a, &b| {
+            let aa = mm.top_processes[a].mem_bytes;
+            let bb = mm.top_processes[b].mem_bytes;
+            bb.cmp(&aa)
+        }),
+    }
+
+    // Scrolling
+    let total_rows = idxs.len();
+    let header_rows = 1usize;
+    let viewport_rows = content.height.saturating_sub(header_rows as u16) as usize;
+    let max_off = total_rows.saturating_sub(viewport_rows);
+    let offset = scroll_offset.min(max_off);
+    let show_n = total_rows.saturating_sub(offset).min(viewport_rows);
+
+    // Build visible rows
+    let total_mem_bytes = mm.mem_total.max(1);
+    let peak_cpu = mm
+        .top_processes
+        .iter()
+        .map(|p| p.cpu_usage)
+        .fold(0.0_f32, f32::max);
+
+    let rows_iter = idxs.iter().skip(offset).take(show_n).map(|&ix| {
+        let p = &mm.top_processes[ix];
+        let mem_pct = (p.mem_bytes as f64 / total_mem_bytes as f64) * 100.0;
+
+        let cpu_val = p.cpu_usage;
+        let cpu_fg = match cpu_val {
+            x if x < 25.0 => Color::Green,
+            x if x < 60.0 => Color::Yellow,
+            _ => Color::Red,
+        };
+        let mem_fg = match mem_pct {
+            x if x < 5.0 => Color::Blue,
+            x if x < 20.0 => Color::Magenta,
+            _ => Color::Red,
+        };
+
+        let emphasis = if (cpu_val - peak_cpu).abs() < f32::EPSILON {
+            Style::default().add_modifier(Modifier::BOLD)
+        } else {
+            Style::default()
+        };
+
+        let cpu_str = fmt_cpu_pct(cpu_val);
+
+        ratatui::widgets::Row::new(vec![
+            ratatui::widgets::Cell::from(p.pid.to_string())
+                .style(Style::default().fg(Color::DarkGray)),
+            ratatui::widgets::Cell::from(p.name.clone()),
+            ratatui::widgets::Cell::from(cpu_str).style(Style::default().fg(cpu_fg)),
+            ratatui::widgets::Cell::from(human(p.mem_bytes)),
+            ratatui::widgets::Cell::from(format!("{mem_pct:.2}%"))
+                .style(Style::default().fg(mem_fg)),
+        ])
+        .style(emphasis)
+    });
+
+    // Header with sort indicator
+    let cpu_hdr = match sort_by {
+        ProcSortBy::CpuDesc => "CPU % •",
+        _ => "CPU %",
+    };
+    let mem_hdr = match sort_by {
+        ProcSortBy::MemDesc => "Mem •",
+        _ => "Mem",
+    };
+    let header = ratatui::widgets::Row::new(vec!["PID", "Name", cpu_hdr, mem_hdr, "Mem %"]).style(
+        Style::default()
+            .fg(Color::Cyan)
+            .add_modifier(Modifier::BOLD),
+    );
+
+    // Render table inside content area (no borders here; outer block already drawn)
+    let table = Table::new(rows_iter, COLS.to_vec())
+        .header(header)
+        .column_spacing(1);
+    f.render_widget(table, content);
+
+    // Draw scrollbar like CPU pane
+    let scroll_area = Rect {
+        x: inner.x + inner.width.saturating_sub(1),
+        y: inner.y,
+        width: 1,
+        height: inner.height,
+    };
+    if scroll_area.height >= 3 {
+        let track = (scroll_area.height - 2) as usize;
+        let total = total_rows.max(1);
+        let view = viewport_rows.clamp(1, total);
+        let max_off = total.saturating_sub(view);
+
+        let thumb_len = (track * view).div_ceil(total).max(1).min(track);
+        let thumb_top = if max_off == 0 {
+            0
+        } else {
+            ((track - thumb_len) * offset + max_off / 2) / max_off
+        };
+
+        // Build lines: top arrow, track (with thumb), bottom arrow
+        let mut lines: Vec<Line> = Vec::with_capacity(scroll_area.height as usize);
+        lines.push(Line::from(Span::styled("▲", Style::default().fg(SB_ARROW))));
+        for i in 0..track {
+            if i >= thumb_top && i < thumb_top + thumb_len {
+                lines.push(Line::from(Span::styled("█", Style::default().fg(SB_THUMB))));
+            } else {
+                lines.push(Line::from(Span::styled("│", Style::default().fg(SB_TRACK))));
+            }
+        }
+        lines.push(Line::from(Span::styled("▼", Style::default().fg(SB_ARROW))));
+        f.render_widget(Paragraph::new(lines), scroll_area);
+    }
+}
+
+fn fmt_cpu_pct(v: f32) -> String {
+    format!("{:>5.1}", v.clamp(0.0, 100.0))
+}
+
+/// Handle keyboard scrolling (Up/Down/PageUp/PageDown/Home/End)
+pub fn processes_handle_key(
+    scroll_offset: &mut usize,
+    key: crossterm::event::KeyEvent,
+    page_size: usize,
+) {
+    crate::ui::cpu::per_core_handle_key(scroll_offset, key, page_size);
+}
+
+/// Handle mouse for content scrolling and scrollbar dragging.
+/// Returns Some(new_sort) if the header "CPU %" or "Mem" was clicked.
+pub fn processes_handle_mouse(
+    scroll_offset: &mut usize,
+    drag: &mut Option<crate::ui::cpu::PerCoreScrollDrag>,
+    mouse: MouseEvent,
+    area: Rect,
+    total_rows: usize,
+) -> Option<ProcSortBy> {
+    // Inner and content areas (match draw_top_processes)
+    let inner = Rect {
+        x: area.x + 1,
+        y: area.y + 1,
+        width: area.width.saturating_sub(2),
+        height: area.height.saturating_sub(2),
+    };
+    if inner.height == 0 || inner.width <= 2 {
+        return None;
+    }
+    let content = Rect {
+        x: inner.x,
+        y: inner.y,
+        width: inner.width.saturating_sub(2),
+        height: inner.height,
+    };
+
+    // Scrollbar interactions (click arrows/page/drag)
+    per_core_handle_scrollbar_mouse(scroll_offset, drag, mouse, area, total_rows);
+
+    // Wheel scrolling when inside the content
+    crate::ui::cpu::per_core_handle_mouse(scroll_offset, mouse, content, content.height as usize);
+
+    // Header click to change sort
+    let header_area = Rect {
+        x: content.x,
+        y: content.y,
+        width: content.width,
+        height: 1,
+    };
+    let inside_header = mouse.row == header_area.y
+        && mouse.column >= header_area.x
+        && mouse.column < header_area.x + header_area.width;
+
+    if inside_header && matches!(mouse.kind, MouseEventKind::Down(MouseButton::Left)) {
+        // Split header into the same columns
+        let cols = Layout::default()
+            .direction(Direction::Horizontal)
+            .constraints(COLS.to_vec())
+            .split(header_area);
+        if mouse.column >= cols[2].x && mouse.column < cols[2].x + cols[2].width {
+            return Some(ProcSortBy::CpuDesc);
+        }
+        if mouse.column >= cols[3].x && mouse.column < cols[3].x + cols[3].width {
+            return Some(ProcSortBy::MemDesc);
+        }
+    }
+
+    // Clamp to valid range
+    per_core_clamp(
+        scroll_offset,
+        total_rows,
+        (content.height.saturating_sub(1)) as usize,
+    );
+    None
+}

socktop/src/ui/swap.rs

@@ -0,0 +1,29 @@
+//! Swap gauge.
+
+use crate::types::Metrics;
+use crate::ui::util::human;
+use ratatui::{
+    layout::Rect,
+    style::{Color, Style},
+    widgets::{Block, Borders, Gauge},
+};
+
+pub fn draw_swap(f: &mut ratatui::Frame<'_>, area: Rect, m: Option<&Metrics>) {
+    let (used, total, pct) = if let Some(mm) = m {
+        let pct = if mm.swap_total > 0 {
+            (mm.swap_used as f64 / mm.swap_total as f64 * 100.0) as u16
+        } else {
+            0
+        };
+        (mm.swap_used, mm.swap_total, pct)
+    } else {
+        (0, 0, 0)
+    };
+
+    let g = Gauge::default()
+        .block(Block::default().borders(Borders::ALL).title("Swap"))
+        .gauge_style(Style::default().fg(Color::Yellow))
+        .percent(pct)
+        .label(format!("{} / {}", human(used), human(total)));
+    f.render_widget(g, area);
+}

socktop/src/ui/theme.rs

@@ -0,0 +1,8 @@
+//! Shared UI theme constants.
+
+use ratatui::style::Color;
+
+// Scrollbar colors (same look as before)
+pub const SB_ARROW: Color = Color::Rgb(170, 170, 180);
+pub const SB_TRACK: Color = Color::Rgb(170, 170, 180);
+pub const SB_THUMB: Color = Color::Rgb(170, 170, 180);

socktop/src/ui/util.rs

@@ -0,0 +1,51 @@
+//! Small UI helpers: human-readable sizes, truncation, icons.
+
+pub fn human(b: u64) -> String {
+    const K: f64 = 1024.0;
+    let b = b as f64;
+    if b < K {
+        return format!("{b:.0}B");
+    }
+    let kb = b / K;
+    if kb < K {
+        return format!("{kb:.1}KB");
+    }
+    let mb = kb / K;
+    if mb < K {
+        return format!("{mb:.1}MB");
+    }
+    let gb = mb / K;
+    if gb < K {
+        return format!("{gb:.1}GB");
+    }
+    let tb = gb / K;
+    format!("{tb:.2}TB")
+}
+
+pub fn truncate_middle(s: &str, max: usize) -> String {
+    if s.len() <= max {
+        return s.to_string();
+    }
+    if max <= 3 {
+        return "...".into();
+    }
+    let keep = max - 3;
+    let left = keep / 2;
+    let right = keep - left;
+    format!("{}...{}", &s[..left], &s[s.len() - right..])
+}
+
+pub fn disk_icon(name: &str) -> &'static str {
+    let n = name.to_ascii_lowercase();
+    if n.contains(':') {
+        "🗄️"
+    } else if n.contains("nvme") {
+        "⚡"
+    } else if n.starts_with("sd") {
+        "💽"
+    } else if n.contains("overlay") {
+        "📦"
+    } else {
+        "🖴"
+    }
+}

socktop/src/ws.rs

@@ -0,0 +1,210 @@
+//! Minimal WebSocket client helpers for requesting metrics from the agent.
+
+use flate2::bufread::GzDecoder;
+use futures_util::{SinkExt, StreamExt};
+use prost::Message as _;
+use rustls::client::danger::{HandshakeSignatureValid, ServerCertVerified, ServerCertVerifier};
+use rustls::pki_types::{CertificateDer, ServerName, UnixTime};
+use rustls::{ClientConfig, RootCertStore};
+use rustls::{DigitallySignedStruct, SignatureScheme};
+use rustls_pemfile::Item;
+use std::io::Read;
+use std::{fs::File, io::BufReader, sync::Arc};
+use tokio::net::TcpStream;
+use tokio_tungstenite::{
+    connect_async, connect_async_tls_with_config, tungstenite::client::IntoClientRequest,
+    tungstenite::Message, Connector, MaybeTlsStream, WebSocketStream,
+};
+use url::Url;
+
+use crate::types::{DiskInfo, Metrics, ProcessInfo, ProcessesPayload};
+
+mod pb {
+    // generated by build.rs
+    include!(concat!(env!("OUT_DIR"), "/socktop.rs"));
+}
+
+pub type WsStream = WebSocketStream<MaybeTlsStream<TcpStream>>;
+
+// Connect to the agent and return the WS stream
+pub async fn connect(
+    url: &str,
+    tls_ca: Option<&str>,
+) -> Result<WsStream, Box<dyn std::error::Error>> {
+    let mut u = Url::parse(url)?;
+    if let Some(ca_path) = tls_ca {
+        if u.scheme() == "ws" {
+            let _ = u.set_scheme("wss");
+        }
+        return connect_with_ca(u.as_str(), ca_path).await;
+    }
+    let (ws, _) = connect_async(u.as_str()).await?;
+    Ok(ws)
+}
+
+async fn connect_with_ca(url: &str, ca_path: &str) -> Result<WsStream, Box<dyn std::error::Error>> {
+    let mut root = RootCertStore::empty();
+    let mut reader = BufReader::new(File::open(ca_path)?);
+    let mut der_certs = Vec::new();
+    while let Ok(Some(item)) = rustls_pemfile::read_one(&mut reader) {
+        if let Item::X509Certificate(der) = item {
+            der_certs.push(der);
+        }
+    }
+    root.add_parsable_certificates(der_certs);
+
+    let mut cfg = ClientConfig::builder()
+        .with_root_certificates(root)
+        .with_no_client_auth();
+
+    let req = url.into_client_request()?;
+    let verify_domain = std::env::var("SOCKTOP_VERIFY_NAME").ok().as_deref() == Some("1");
+    if !verify_domain {
+        #[derive(Debug)]
+        struct NoVerify;
+        impl ServerCertVerifier for NoVerify {
+            fn verify_server_cert(
+                &self,
+                _end_entity: &CertificateDer<'_>,
+                _intermediates: &[CertificateDer<'_>],
+                _server_name: &ServerName,
+                _ocsp_response: &[u8],
+                _now: UnixTime,
+            ) -> Result<ServerCertVerified, rustls::Error> {
+                Ok(ServerCertVerified::assertion())
+            }
+            fn verify_tls12_signature(
+                &self,
+                _message: &[u8],
+                _cert: &CertificateDer<'_>,
+                _dss: &DigitallySignedStruct,
+            ) -> Result<HandshakeSignatureValid, rustls::Error> {
+                Ok(HandshakeSignatureValid::assertion())
+            }
+            fn verify_tls13_signature(
+                &self,
+                _message: &[u8],
+                _cert: &CertificateDer<'_>,
+                _dss: &DigitallySignedStruct,
+            ) -> Result<HandshakeSignatureValid, rustls::Error> {
+                Ok(HandshakeSignatureValid::assertion())
+            }
+            fn supported_verify_schemes(&self) -> Vec<SignatureScheme> {
+                // Provide common schemes; not strictly needed for skipping but keeps API happy
+                vec![
+                    SignatureScheme::ECDSA_NISTP256_SHA256,
+                    SignatureScheme::ED25519,
+                    SignatureScheme::RSA_PSS_SHA256,
+                ]
+            }
+        }
+        cfg.dangerous().set_certificate_verifier(Arc::new(NoVerify));
+        eprintln!("socktop: hostname verification disabled (default). Use --verify-hostname to enable strict SAN checking.");
+    }
+    let cfg = Arc::new(cfg);
+    let (ws, _) =
+        connect_async_tls_with_config(req, None, verify_domain, Some(Connector::Rustls(cfg)))
+            .await?;
+    Ok(ws)
+}
+
+// Send a "get_metrics" request and await a single JSON reply
+pub async fn request_metrics(ws: &mut WsStream) -> Option<Metrics> {
+    if ws.send(Message::Text("get_metrics".into())).await.is_err() {
+        return None;
+    }
+    match ws.next().await {
+        Some(Ok(Message::Binary(b))) => {
+            gunzip_to_string(&b).and_then(|s| serde_json::from_str::<Metrics>(&s).ok())
+        }
+        Some(Ok(Message::Text(json))) => serde_json::from_str::<Metrics>(&json).ok(),
+        _ => None,
+    }
+}
+
+// Decompress a gzip-compressed binary frame into a String.
+fn gunzip_to_string(bytes: &[u8]) -> Option<String> {
+    let mut dec = GzDecoder::new(bytes);
+    let mut out = String::new();
+    dec.read_to_string(&mut out).ok()?;
+    Some(out)
+}
+
+fn gunzip_to_vec(bytes: &[u8]) -> Option<Vec<u8>> {
+    let mut dec = GzDecoder::new(bytes);
+    let mut out = Vec::new();
+    dec.read_to_end(&mut out).ok()?;
+    Some(out)
+}
+
+fn is_gzip(bytes: &[u8]) -> bool {
+    bytes.len() >= 2 && bytes[0] == 0x1f && bytes[1] == 0x8b
+}
+// Suppress dead_code until these are wired into the app
+#[allow(dead_code)]
+pub enum Payload {
+    Metrics(Metrics),
+    Disks(Vec<DiskInfo>),
+    Processes(ProcessesPayload),
+}
+
+// Send a "get_disks" request and await a JSON Vec<DiskInfo>
+pub async fn request_disks(ws: &mut WsStream) -> Option<Vec<DiskInfo>> {
+    if ws.send(Message::Text("get_disks".into())).await.is_err() {
+        return None;
+    }
+    match ws.next().await {
+        Some(Ok(Message::Binary(b))) => {
+            gunzip_to_string(&b).and_then(|s| serde_json::from_str::<Vec<DiskInfo>>(&s).ok())
+        }
+        Some(Ok(Message::Text(json))) => serde_json::from_str::<Vec<DiskInfo>>(&json).ok(),
+        _ => None,
+    }
+}
+
+// Send a "get_processes" request and await a ProcessesPayload decoded from protobuf (binary, may be gzipped)
+pub async fn request_processes(ws: &mut WsStream) -> Option<ProcessesPayload> {
+    if ws
+        .send(Message::Text("get_processes".into()))
+        .await
+        .is_err()
+    {
+        return None;
+    }
+    match ws.next().await {
+        Some(Ok(Message::Binary(b))) => {
+            let gz = is_gzip(&b);
+            let data = if gz { gunzip_to_vec(&b)? } else { b };
+            match pb::Processes::decode(data.as_slice()) {
+                Ok(pb) => {
+                    let rows: Vec<ProcessInfo> = pb
+                        .rows
+                        .into_iter()
+                        .map(|p: pb::Process| ProcessInfo {
+                            pid: p.pid,
+                            name: p.name,
+                            cpu_usage: p.cpu_usage,
+                            mem_bytes: p.mem_bytes,
+                        })
+                        .collect();
+                    Some(ProcessesPayload {
+                        process_count: pb.process_count as usize,
+                        top_processes: rows,
+                    })
+                }
+                Err(e) => {
+                    if std::env::var("SOCKTOP_DEBUG").ok().as_deref() == Some("1") {
+                        eprintln!("protobuf decode failed: {e}");
+                    }
+                    // Fallback: maybe it's JSON (bytes already decompressed if gz)
+                    match String::from_utf8(data) {
+                        Ok(s) => serde_json::from_str::<ProcessesPayload>(&s).ok(),
+                        Err(_) => None,
+                    }
+                }
+            }
+        }
+        Some(Ok(Message::Text(json))) => serde_json::from_str::<ProcessesPayload>(&json).ok(),
+        _ => None,
+    }
+}

socktop/tests/cli_args.rs

@@ -0,0 +1,75 @@
+//! CLI arg parsing tests for socktop (client)
+use std::process::Command;
+
+// We test the parsing by invoking the binary with --help and ensuring the help mentions short and long flags.
+// Also directly test the parse_args function via a tiny helper in a doctest-like fashion using a small
+// reimplementation here kept in sync with main (compile-time test).
+
+#[test]
+fn test_help_mentions_short_and_long_flags() {
+    let output = Command::new(env!("CARGO_BIN_EXE_socktop"))
+        .arg("--help")
+        .output()
+        .expect("run socktop --help");
+    let text = format!(
+        "{}{}",
+        String::from_utf8_lossy(&output.stdout),
+        String::from_utf8_lossy(&output.stderr)
+    );
+    assert!(
+        text.contains("--tls-ca")
+            && text.contains("-t")
+            && text.contains("--profile")
+            && text.contains("-P"),
+        "help text missing expected flags (--tls-ca/-t, --profile/-P)\n{text}"
+    );
+}
+
+#[test]
+fn test_tlc_ca_arg_long_and_short_parsed() {
+    // Use --help combined with flags to avoid network and still exercise arg acceptance
+    let exe = env!("CARGO_BIN_EXE_socktop");
+    // Long form with help
+    let out = Command::new(exe)
+        .args(["--tls-ca", "/tmp/cert.pem", "--help"])
+        .output()
+        .expect("run socktop");
+    assert!(
+        out.status.success(),
+        "socktop --tls-ca … --help did not succeed"
+    );
+    let text = format!(
+        "{}{}",
+        String::from_utf8_lossy(&out.stdout),
+        String::from_utf8_lossy(&out.stderr)
+    );
+    assert!(text.contains("Usage:"));
+    // Short form with help
+    let out2 = Command::new(exe)
+        .args(["-t", "/tmp/cert.pem", "--help"])
+        .output()
+        .expect("run socktop");
+    assert!(out2.status.success(), "socktop -t … --help did not succeed");
+    let text2 = format!(
+        "{}{}",
+        String::from_utf8_lossy(&out2.stdout),
+        String::from_utf8_lossy(&out2.stderr)
+    );
+    assert!(text2.contains("Usage:"));
+
+    // Profile flags with help (should not error)
+    let out3 = Command::new(exe)
+        .args(["--profile", "dev", "--help"])
+        .output()
+        .expect("run socktop");
+    assert!(
+        out3.status.success(),
+        "socktop --profile dev --help did not succeed"
+    );
+    let text3 = format!(
+        "{}{}",
+        String::from_utf8_lossy(&out3.stdout),
+        String::from_utf8_lossy(&out3.stderr)
+    );
+    assert!(text3.contains("Usage:"));
+}

socktop/tests/profiles.rs

@@ -0,0 +1,118 @@
+//! Tests for profile load/save and resolution logic (non-interactive paths only)
+use std::fs;
+use std::sync::Mutex;
+
+// Global lock to serialize tests that mutate process-wide environment variables.
+static ENV_LOCK: Mutex<()> = Mutex::new(());
+
+#[allow(dead_code)] // touch crate
+fn touch() {
+    let _ = socktop::types::Metrics {
+        cpu_total: 0.0,
+        cpu_per_core: vec![],
+        mem_total: 0,
+        mem_used: 0,
+        swap_total: 0,
+        swap_used: 0,
+        process_count: None,
+        hostname: String::new(),
+        cpu_temp_c: None,
+        disks: vec![],
+        networks: vec![],
+        top_processes: vec![],
+        gpus: None,
+    };
+}
+
+// We re-import internal modules by copying minimal logic here because profiles.rs isn't public.
+// Instead of exposing internals, we simulate profile saving through CLI invocations.
+
+use std::process::Command;
+
+fn run_socktop(args: &[&str]) -> (bool, String) {
+    let exe = env!("CARGO_BIN_EXE_socktop");
+    let output = Command::new(exe).args(args).output().expect("run socktop");
+    let ok = output.status.success();
+    let text = format!(
+        "{}{}",
+        String::from_utf8_lossy(&output.stdout),
+        String::from_utf8_lossy(&output.stderr)
+    );
+    (ok, text)
+}
+
+fn config_dir() -> std::path::PathBuf {
+    if let Some(xdg) = std::env::var_os("XDG_CONFIG_HOME") {
+        std::path::PathBuf::from(xdg).join("socktop")
+    } else {
+        dirs_next::config_dir()
+            .unwrap_or_else(|| std::path::PathBuf::from("."))
+            .join("socktop")
+    }
+}
+
+fn profiles_path() -> std::path::PathBuf {
+    config_dir().join("profiles.json")
+}
+
+#[test]
+fn test_profile_created_on_first_use() {
+    let _guard = ENV_LOCK.lock().unwrap();
+    // Isolate config in a temp dir
+    let td = tempfile::tempdir().unwrap();
+    std::env::set_var("XDG_CONFIG_HOME", td.path());
+    // Ensure directory exists fresh
+    std::fs::create_dir_all(td.path().join("socktop")).unwrap();
+    let _ = fs::remove_file(profiles_path());
+    // Provide profile + url => should create profiles.json
+    let (_ok, _out) = run_socktop(&["--profile", "unittest", "ws://example:1/ws", "--dry-run"]);
+    // We pass --help to exit early after parsing (no network attempt)
+    let data = fs::read_to_string(profiles_path()).expect("profiles.json created");
+    assert!(
+        data.contains("unittest"),
+        "profiles.json missing profile entry: {data}"
+    );
+}
+
+#[test]
+fn test_profile_overwrite_only_when_changed() {
+    let _guard = ENV_LOCK.lock().unwrap();
+    let td = tempfile::tempdir().unwrap();
+    std::env::set_var("XDG_CONFIG_HOME", td.path());
+    std::fs::create_dir_all(td.path().join("socktop")).unwrap();
+    let _ = fs::remove_file(profiles_path());
+    // Initial create
+    let (_ok, _out) = run_socktop(&["--profile", "prod", "ws://one/ws", "--dry-run"]); // create
+    let first = fs::read_to_string(profiles_path()).unwrap();
+    // Re-run identical (should not duplicate or corrupt)
+    let (_ok2, _out2) = run_socktop(&["--profile", "prod", "ws://one/ws", "--dry-run"]); // identical
+    let second = fs::read_to_string(profiles_path()).unwrap();
+    assert_eq!(
+        first, second,
+        "Profile file changed despite identical input"
+    );
+    // Overwrite with different URL using --save (no prompt path)
+    let (_ok3, _out3) = run_socktop(&["--profile", "prod", "--save", "ws://two/ws", "--dry-run"]);
+    let third = fs::read_to_string(profiles_path()).unwrap();
+    assert!(third.contains("two"), "Updated URL not written: {third}");
+}
+
+#[test]
+fn test_profile_tls_ca_persisted() {
+    let _guard = ENV_LOCK.lock().unwrap();
+    let td = tempfile::tempdir().unwrap();
+    std::env::set_var("XDG_CONFIG_HOME", td.path());
+    std::fs::create_dir_all(td.path().join("socktop")).unwrap();
+    let _ = fs::remove_file(profiles_path());
+    let (_ok, _out) = run_socktop(&[
+        "--profile",
+        "secureX",
+        "--tls-ca",
+        "/tmp/cert.pem",
+        "wss://host/ws",
+        "--dry-run",
+    ]);
+    let data = fs::read_to_string(profiles_path()).unwrap();
+    assert!(data.contains("secureX"));
+    assert!(data.contains("cert.pem"));
+}

socktop/tests/ws_probe.rs

@@ -0,0 +1,29 @@
+use socktop::ws::{connect, request_metrics, request_processes};
+
+// Integration probe: only runs when SOCKTOP_WS is set to an agent WebSocket URL.
+// Example: SOCKTOP_WS=ws://127.0.0.1:3000/ws cargo test -p socktop --test ws_probe -- --nocapture
+#[tokio::test]
+async fn probe_ws_endpoints() {
+    // Gate the test to avoid CI failures when no agent is running.
+    let url = match std::env::var("SOCKTOP_WS") {
+        Ok(v) if !v.is_empty() => v,
+        _ => {
+            eprintln!(
+                "skipping ws_probe: set SOCKTOP_WS=ws://host:port/ws to run this integration test"
+            );
+            return;
+        }
+    };
+
+    // Optional pinned CA for WSS/self-signed setups
+    let tls_ca = std::env::var("SOCKTOP_TLS_CA").ok();
+    let mut ws = connect(&url, tls_ca.as_deref()).await.expect("connect ws");
+
+    // Should get fast metrics quickly
+    let m = request_metrics(&mut ws).await;
+    assert!(m.is_some(), "expected Metrics payload within timeout");
+
+    // Processes may be gzipped and a bit slower, but should arrive
+    let p = request_processes(&mut ws).await;
+    assert!(p.is_some(), "expected Processes payload within timeout");
+}

socktop_agent/Cargo.toml

@@ -0,0 +1,37 @@
+[package]
+name = "socktop_agent"
+version = "0.1.3"
+authors = ["Jason Witty <jasonpwitty+socktop@proton.me>"]
+description = "Remote system monitor over WebSocket, TUI like top"
+edition = "2021"
+license = "MIT"
+
+[dependencies]
+tokio = { version = "1", features = ["full"] }
+axum = { version = "0.7", features = ["ws", "macros"] }
+sysinfo = { version = "0.37", features = ["network", "disk", "component"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+flate2 = { version = "1", default-features = false, features = ["rust_backend"] }
+futures-util = "0.3.31"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+# nvml-wrapper removed (unused; GPU metrics via gfxinfo only now)
+gfxinfo = "0.1.2"
+once_cell = "1.19"
+axum-server = { version = "0.6", features = ["tls-rustls"] }
+rustls = "0.23"
+rustls-pemfile = "2.1"
+rcgen = "0.13"  # pure-Rust self-signed cert generation (replaces openssl vendored build)
+anyhow = "1"
+hostname = "0.3"
+prost = { workspace = true }
+time = { version = "0.3", default-features = false, features = ["formatting", "macros", "parsing" ] }
+
+[build-dependencies]
+prost-build = "0.13"
+tonic-build = { version = "0.12", default-features = false, optional = true }
+protoc-bin-vendored = "3"
+[dev-dependencies]
+assert_cmd = "2.0"
+tempfile = "3.10"

socktop_agent/build.rs

@@ -0,0 +1,14 @@
+fn main() {
+    // Vendored protoc for reproducible builds
+    let protoc = protoc_bin_vendored::protoc_bin_path().expect("protoc");
+    std::env::set_var("PROTOC", &protoc);
+
+    println!("cargo:rerun-if-changed=proto/processes.proto");
+
+    // Compile protobuf definitions for processes
+    let mut cfg = prost_build::Config::new();
+    cfg.out_dir(std::env::var("OUT_DIR").unwrap());
+    // Use local path (ensures file is inside published crate tarball)
+    cfg.compile_protos(&["proto/processes.proto"], &["proto"]) // relative to CARGO_MANIFEST_DIR
+        .expect("compile protos");
+}

socktop_agent/proto/processes.proto

@@ -0,0 +1,15 @@
+syntax = "proto3";
+package socktop;
+
+// All running processes. Sorting is done client-side.
+message Processes {
+  uint64 process_count = 1;           // total processes in the system
+  repeated Process rows = 2;          // all processes
+}
+
+message Process {
+  uint32 pid = 1;
+  string name = 2;
+  float cpu_usage = 3;                // 0..100
+  uint64 mem_bytes = 4;               // RSS bytes
+}

socktop_agent/src/gpu.rs

@@ -0,0 +1,24 @@
+// gpu.rs
+use gfxinfo::active_gpu;
+
+#[derive(Debug, Clone, serde::Serialize)]
+pub struct GpuMetrics {
+    pub name: String,
+    pub utilization_gpu_pct: u32, // 0..100
+    pub mem_used_bytes: u64,
+    pub mem_total_bytes: u64,
+}
+
+pub fn collect_all_gpus() -> Result<Vec<GpuMetrics>, Box<dyn std::error::Error>> {
+    let gpu = active_gpu()?; // Use ? to unwrap Result
+    let info = gpu.info();
+
+    let metrics = GpuMetrics {
+        name: gpu.model().to_string(),
+        utilization_gpu_pct: info.load_pct() as u32,
+        mem_used_bytes: info.used_vram(),
+        mem_total_bytes: info.total_vram(),
+    };
+
+    Ok(vec![metrics])
+}

socktop_agent/src/main.rs

@@ -0,0 +1,93 @@
+//! socktop agent entrypoint: sets up sysinfo handles and serves a WebSocket endpoint at /ws.
+
+mod gpu;
+mod metrics;
+mod proto;
+// sampler module removed (metrics now purely request-driven)
+mod state;
+mod types;
+mod ws;
+
+use axum::{http::StatusCode, routing::get, Router};
+use std::net::SocketAddr;
+use std::str::FromStr;
+
+mod tls;
+
+use state::AppState;
+
+fn arg_flag(name: &str) -> bool {
+    std::env::args().any(|a| a == name)
+}
+fn arg_value(name: &str) -> Option<String> {
+    let mut it = std::env::args();
+    while let Some(a) = it.next() {
+        if a == name {
+            return it.next();
+        }
+    }
+    None
+}
+
+// (tests moved to end of file to satisfy clippy::items_after_test_module)
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    tracing_subscriber::fmt::init();
+
+    // Version flag (print and exit). Keep before heavy initialization.
+    if arg_flag("--version") || arg_flag("-V") {
+        println!("socktop_agent {}", env!("CARGO_PKG_VERSION"));
+        return Ok(());
+    }
+
+    let state = AppState::new();
+
+    // No background samplers: metrics collected on-demand per websocket request.
+
+    // Web app: route /ws to the websocket handler
+    async fn healthz() -> StatusCode {
+        println!("/healthz request");
+        StatusCode::OK
+    }
+    let app = Router::new()
+        .route("/ws", get(ws::ws_handler))
+        .route("/healthz", get(healthz))
+        .with_state(state.clone());
+
+    let enable_ssl =
+        arg_flag("--enableSSL") || std::env::var("SOCKTOP_ENABLE_SSL").ok().as_deref() == Some("1");
+    if enable_ssl {
+        // Port can be overridden by --port or SOCKTOP_PORT; default to 8443 when SSL
+        let port = arg_value("--port")
+            .or_else(|| arg_value("-p"))
+            .or_else(|| std::env::var("SOCKTOP_PORT").ok())
+            .and_then(|s| s.parse::<u16>().ok())
+            .unwrap_or(8443);
+
+        let (cert_path, key_path) = tls::ensure_self_signed_cert()?;
+        let cfg = axum_server::tls_rustls::RustlsConfig::from_pem_file(cert_path, key_path).await?;
+
+        let addr = SocketAddr::from_str(&format!("0.0.0.0:{port}"))?;
+        println!("socktop_agent: TLS enabled. Listening on wss://{addr}/ws");
+        axum_server::bind_rustls(addr, cfg)
+            .serve(app.into_make_service())
+            .await?;
+        return Ok(());
+    }
+
+    // Non-TLS HTTP/WS path
+    let port = arg_value("--port")
+        .or_else(|| arg_value("-p"))
+        .or_else(|| std::env::var("SOCKTOP_PORT").ok())
+        .and_then(|s| s.parse::<u16>().ok())
+        .unwrap_or(3000);
+    let addr = SocketAddr::from(([0, 0, 0, 0], port));
+    println!("socktop_agent: Listening on ws://{addr}/ws");
+    axum_server::bind(addr)
+        .serve(app.into_make_service())
+        .await?;
+    Ok(())
+}
+
+// Unit tests for CLI parsing moved to `tests/port_parse.rs`.

socktop_agent/src/metrics.rs

@@ -0,0 +1,457 @@
+//! Metrics collection using sysinfo for socktop_agent.
+
+use crate::gpu::collect_all_gpus;
+use crate::state::AppState;
+use crate::types::{DiskInfo, Metrics, NetworkInfo, ProcessInfo, ProcessesPayload};
+use once_cell::sync::OnceCell;
+#[cfg(target_os = "linux")]
+use std::collections::HashMap;
+#[cfg(target_os = "linux")]
+use std::fs;
+#[cfg(target_os = "linux")]
+use std::io;
+use std::sync::Mutex;
+use std::time::Duration as StdDuration;
+use std::time::{Duration, Instant};
+use sysinfo::{ProcessRefreshKind, ProcessesToUpdate};
+use tracing::warn;
+
+// Runtime toggles (read once)
+fn gpu_enabled() -> bool {
+    static ON: OnceCell<bool> = OnceCell::new();
+    *ON.get_or_init(|| {
+        std::env::var("SOCKTOP_AGENT_GPU")
+            .map(|v| v != "0")
+            .unwrap_or(true)
+    })
+}
+fn temp_enabled() -> bool {
+    static ON: OnceCell<bool> = OnceCell::new();
+    *ON.get_or_init(|| {
+        std::env::var("SOCKTOP_AGENT_TEMP")
+            .map(|v| v != "0")
+            .unwrap_or(true)
+    })
+}
+
+// Tiny TTL caches to avoid rescanning sensors every 500ms
+const TTL: Duration = Duration::from_millis(1500);
+struct TempCache {
+    at: Option<Instant>,
+    v: Option<f32>,
+}
+static TEMP: OnceCell<Mutex<TempCache>> = OnceCell::new();
+
+struct GpuCache {
+    at: Option<Instant>,
+    v: Option<Vec<crate::gpu::GpuMetrics>>,
+}
+static GPUC: OnceCell<Mutex<GpuCache>> = OnceCell::new();
+
+fn cached_temp() -> Option<f32> {
+    if !temp_enabled() {
+        return None;
+    }
+    let now = Instant::now();
+    let lock = TEMP.get_or_init(|| Mutex::new(TempCache { at: None, v: None }));
+    let mut c = lock.lock().ok()?;
+    if c.at.is_none_or(|t| now.duration_since(t) >= TTL) {
+        c.at = Some(now);
+        // caller will fill this; we just hold a slot
+        c.v = None;
+    }
+    c.v
+}
+
+fn set_temp(v: Option<f32>) {
+    if let Some(lock) = TEMP.get() {
+        if let Ok(mut c) = lock.lock() {
+            c.v = v;
+            c.at = Some(Instant::now());
+        }
+    }
+}
+
+fn cached_gpus() -> Option<Vec<crate::gpu::GpuMetrics>> {
+    if !gpu_enabled() {
+        return None;
+    }
+    let now = Instant::now();
+    let lock = GPUC.get_or_init(|| Mutex::new(GpuCache { at: None, v: None }));
+    let mut c = lock.lock().ok()?;
+    if c.at.is_none_or(|t| now.duration_since(t) >= TTL) {
+        // mark stale; caller will refresh
+        c.at = Some(now);
+        c.v = None;
+    }
+    c.v.clone()
+}
+
+fn set_gpus(v: Option<Vec<crate::gpu::GpuMetrics>>) {
+    if let Some(lock) = GPUC.get() {
+        if let Ok(mut c) = lock.lock() {
+            c.v = v.clone();
+            c.at = Some(Instant::now());
+        }
+    }
+}
+
+// Collect only fast-changing metrics (CPU/mem/net + optional temps/gpus).
+pub async fn collect_fast_metrics(state: &AppState) -> Metrics {
+    // TTL (ms) overridable via env, default 250ms
+    let ttl_ms: u64 = std::env::var("SOCKTOP_AGENT_METRICS_TTL_MS")
+        .ok()
+        .and_then(|v| v.parse().ok())
+        .unwrap_or(250);
+    let ttl = StdDuration::from_millis(ttl_ms);
+    {
+        let cache = state.cache_metrics.lock().await;
+        if cache.is_fresh(ttl) {
+            if let Some(c) = cache.take_clone() {
+                return c;
+            }
+        }
+    }
+    let mut sys = state.sys.lock().await;
+    if let Err(e) = std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| {
+        sys.refresh_cpu_usage();
+        sys.refresh_memory();
+    })) {
+        warn!("sysinfo selective refresh panicked: {e:?}");
+    }
+
+    let hostname = state.hostname.clone();
+    let cpu_total = sys.global_cpu_usage();
+    let cpu_per_core: Vec<f32> = sys.cpus().iter().map(|c| c.cpu_usage()).collect();
+    let mem_total = sys.total_memory();
+    let mem_used = mem_total.saturating_sub(sys.available_memory());
+    let swap_total = sys.total_swap();
+    let swap_used = sys.used_swap();
+    drop(sys);
+
+    // CPU temperature: only refresh sensors if cache is stale
+    let cpu_temp_c = if cached_temp().is_some() {
+        cached_temp()
+    } else if temp_enabled() {
+        let val = {
+            let mut components = state.components.lock().await;
+            components.refresh(false);
+            components.iter().find_map(|c| {
+                let l = c.label().to_ascii_lowercase();
+                if l.contains("cpu")
+                    || l.contains("package")
+                    || l.contains("tctl")
+                    || l.contains("tdie")
+                {
+                    c.temperature()
+                } else {
+                    None
+                }
+            })
+        };
+        set_temp(val);
+        val
+    } else {
+        None
+    };
+
+    // Networks
+    let networks: Vec<NetworkInfo> = {
+        let mut nets = state.networks.lock().await;
+        nets.refresh(false);
+        nets.iter()
+            .map(|(name, data)| NetworkInfo {
+                name: name.to_string(),
+                received: data.total_received(),
+                transmitted: data.total_transmitted(),
+            })
+            .collect()
+    };
+
+    // GPUs: if we already determined none exist, short-circuit (no repeated probing)
+    let gpus = if gpu_enabled() {
+        if state.gpu_checked.load(std::sync::atomic::Ordering::Acquire)
+            && !state.gpu_present.load(std::sync::atomic::Ordering::Relaxed)
+        {
+            None
+        } else if cached_gpus().is_some() {
+            cached_gpus()
+        } else {
+            let v = match collect_all_gpus() {
+                Ok(v) if !v.is_empty() => Some(v),
+                Ok(_) => None,
+                Err(e) => {
+                    warn!("gpu collection failed: {e}");
+                    None
+                }
+            };
+            // First probe records presence; subsequent calls rely on cache flags.
+            if !state
+                .gpu_checked
+                .swap(true, std::sync::atomic::Ordering::AcqRel)
+            {
+                if v.is_some() {
+                    state
+                        .gpu_present
+                        .store(true, std::sync::atomic::Ordering::Release);
+                } else {
+                    state
+                        .gpu_present
+                        .store(false, std::sync::atomic::Ordering::Release);
+                }
+            }
+            set_gpus(v.clone());
+            v
+        }
+    } else {
+        None
+    };
+
+    let metrics = Metrics {
+        cpu_total,
+        cpu_per_core,
+        mem_total,
+        mem_used,
+        swap_total,
+        swap_used,
+        hostname,
+        cpu_temp_c,
+        disks: Vec::new(),
+        networks,
+        top_processes: Vec::new(),
+        gpus,
+    };
+    {
+        let mut cache = state.cache_metrics.lock().await;
+        cache.set(metrics.clone());
+    }
+    metrics
+}
+
+// Cached disks
+pub async fn collect_disks(state: &AppState) -> Vec<DiskInfo> {
+    let ttl_ms: u64 = std::env::var("SOCKTOP_AGENT_DISKS_TTL_MS")
+        .ok()
+        .and_then(|v| v.parse().ok())
+        .unwrap_or(1_000);
+    let ttl = StdDuration::from_millis(ttl_ms);
+    {
+        let cache = state.cache_disks.lock().await;
+        if cache.is_fresh(ttl) {
+            if let Some(v) = cache.take_clone() {
+                return v;
+            }
+        }
+    }
+    let mut disks_list = state.disks.lock().await;
+    disks_list.refresh(false); // don't drop missing disks
+    let disks: Vec<DiskInfo> = disks_list
+        .iter()
+        .map(|d| DiskInfo {
+            name: d.name().to_string_lossy().into_owned(),
+            total: d.total_space(),
+            available: d.available_space(),
+        })
+        .collect();
+    {
+        let mut cache = state.cache_disks.lock().await;
+        cache.set(disks.clone());
+    }
+    disks
+}
+
+// Linux-only helpers and implementation using /proc deltas for accurate CPU%.
+#[cfg(target_os = "linux")]
+#[inline]
+fn read_total_jiffies() -> io::Result<u64> {
+    // /proc/stat first line: "cpu  user nice system idle iowait irq softirq steal ..."
+    let s = fs::read_to_string("/proc/stat")?;
+    if let Some(line) = s.lines().next() {
+        let mut it = line.split_whitespace();
+        let _cpu = it.next(); // "cpu"
+        let mut sum: u64 = 0;
+        for tok in it.take(8) {
+            if let Ok(v) = tok.parse::<u64>() {
+                sum = sum.saturating_add(v);
+            }
+        }
+        return Ok(sum);
+    }
+    Err(io::Error::other("no cpu line"))
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+fn read_proc_jiffies(pid: u32) -> Option<u64> {
+    let path = format!("/proc/{pid}/stat");
+    let s = fs::read_to_string(path).ok()?;
+    // Find the right parenthesis that terminates comm; everything after is space-separated fields starting at "state"
+    let rpar = s.rfind(')')?;
+    let after = s.get(rpar + 2..)?; // skip ") "
+    let mut it = after.split_whitespace();
+    // utime (14th field) is offset 11 from "state", stime (15th) is next
+    let utime = it.nth(11)?.parse::<u64>().ok()?;
+    let stime = it.next()?.parse::<u64>().ok()?;
+    Some(utime.saturating_add(stime))
+}
+
+/// Collect all processes (Linux): compute CPU% via /proc jiffies delta; sorting moved to client.
+#[cfg(target_os = "linux")]
+pub async fn collect_processes_all(state: &AppState) -> ProcessesPayload {
+    let ttl_ms: u64 = std::env::var("SOCKTOP_AGENT_PROCESSES_TTL_MS")
+        .ok()
+        .and_then(|v| v.parse().ok())
+        .unwrap_or(1_000);
+    let ttl = StdDuration::from_millis(ttl_ms);
+    {
+        let cache = state.cache_processes.lock().await;
+        if cache.is_fresh(ttl) {
+            if let Some(v) = cache.take_clone() {
+                return v;
+            }
+        }
+    }
+    // Reuse shared System to avoid reallocation; refresh processes fully.
+    let mut sys_guard = state.sys.lock().await;
+    let sys = &mut *sys_guard;
+    sys.refresh_processes_specifics(
+        ProcessesToUpdate::All,
+        false,
+        ProcessRefreshKind::everything().without_tasks(),
+    );
+
+    let total_count = sys.processes().len();
+
+    // Snapshot current per-pid jiffies
+    let mut current: HashMap<u32, u64> = HashMap::with_capacity(total_count);
+    for p in sys.processes().values() {
+        let pid = p.pid().as_u32();
+        if let Some(j) = read_proc_jiffies(pid) {
+            current.insert(pid, j);
+        }
+    }
+    let total_now = read_total_jiffies().unwrap_or(0);
+
+    // Compute deltas vs last sample
+    let (last_total, mut last_map) = {
+        #[cfg(target_os = "linux")]
+        {
+            let mut t = state.proc_cpu.lock().await;
+            let lt = t.last_total;
+            let lm = std::mem::take(&mut t.last_per_pid);
+            t.last_total = total_now;
+            t.last_per_pid = current.clone();
+            (lt, lm)
+        }
+        #[cfg(not(target_os = "linux"))]
+        {
+            let _: u64 = total_now; // silence unused warning
+            (0u64, HashMap::new())
+        }
+    };
+
+    // On first run or if total delta is tiny, report zeros
+    if last_total == 0 || total_now <= last_total {
+        let procs: Vec<ProcessInfo> = sys
+            .processes()
+            .values()
+            .map(|p| ProcessInfo {
+                pid: p.pid().as_u32(),
+                name: p.name().to_string_lossy().into_owned(),
+                cpu_usage: 0.0,
+                mem_bytes: p.memory(),
+            })
+            .collect();
+        return ProcessesPayload {
+            process_count: total_count,
+            top_processes: procs,
+        };
+    }
+
+    let dt = total_now.saturating_sub(last_total).max(1) as f32;
+
+    let procs: Vec<ProcessInfo> = sys
+        .processes()
+        .values()
+        .map(|p| {
+            let pid = p.pid().as_u32();
+            let now = current.get(&pid).copied().unwrap_or(0);
+            let prev = last_map.remove(&pid).unwrap_or(0);
+            let du = now.saturating_sub(prev) as f32;
+            let cpu = ((du / dt) * 100.0).clamp(0.0, 100.0);
+            ProcessInfo {
+                pid,
+                name: p.name().to_string_lossy().into_owned(),
+                cpu_usage: cpu,
+                mem_bytes: p.memory(),
+            }
+        })
+        .collect();
+
+    let payload = ProcessesPayload {
+        process_count: total_count,
+        top_processes: procs,
+    };
+    {
+        let mut cache = state.cache_processes.lock().await;
+        cache.set(payload.clone());
+    }
+    payload
+}
+
+/// Collect all processes (non-Linux): use sysinfo's internal CPU% by doing a double refresh.
+#[cfg(not(target_os = "linux"))]
+pub async fn collect_processes_all(state: &AppState) -> ProcessesPayload {
+    use tokio::time::sleep;
+    let ttl_ms: u64 = std::env::var("SOCKTOP_AGENT_PROCESSES_TTL_MS")
+        .ok()
+        .and_then(|v| v.parse().ok())
+        .unwrap_or(1_000);
+    let ttl = StdDuration::from_millis(ttl_ms);
+    {
+        let cache = state.cache_processes.lock().await;
+        if cache.is_fresh(ttl) {
+            if let Some(v) = cache.take_clone() {
+                return v;
+            }
+        }
+    }
+    {
+        let mut sys = state.sys.lock().await;
+        sys.refresh_processes_specifics(
+            ProcessesToUpdate::All,
+            false,
+            ProcessRefreshKind::everything().without_tasks(),
+        );
+    }
+    // Release lock during sleep interval
+    sleep(Duration::from_millis(250)).await;
+    {
+        let mut sys = state.sys.lock().await;
+        sys.refresh_processes_specifics(
+            ProcessesToUpdate::All,
+            false,
+            ProcessRefreshKind::everything().without_tasks(),
+        );
+        let total_count = sys.processes().len();
+        let procs: Vec<ProcessInfo> = sys
+            .processes()
+            .values()
+            .map(|p| ProcessInfo {
+                pid: p.pid().as_u32(),
+                name: p.name().to_string_lossy().into_owned(),
+                cpu_usage: p.cpu_usage(),
+                mem_bytes: p.memory(),
+            })
+            .collect();
+        let payload = ProcessesPayload {
+            process_count: total_count,
+            top_processes: procs,
+        };
+        {
+            let mut cache = state.cache_processes.lock().await;
+            cache.set(payload.clone());
+        }
+        payload
+    }
+}

socktop_agent/src/proto.rs

@@ -0,0 +1,5 @@
+// Generated protobuf modules live under OUT_DIR; include them here.
+// This module will expose socktop::Processes and socktop::Process types.
+pub mod pb {
+    include!(concat!(env!("OUT_DIR"), "/socktop.rs"));
+}

socktop_agent/src/state.rs

@@ -0,0 +1,103 @@
+//! Shared agent state: sysinfo handles and hot JSON cache.
+
+#[cfg(target_os = "linux")]
+use std::collections::HashMap;
+use std::sync::atomic::{AtomicBool, AtomicUsize};
+use std::sync::Arc;
+use std::time::{Duration, Instant};
+use sysinfo::{Components, Disks, Networks, System};
+use tokio::sync::Mutex;
+
+pub type SharedSystem = Arc<Mutex<System>>;
+pub type SharedComponents = Arc<Mutex<Components>>;
+pub type SharedDisks = Arc<Mutex<Disks>>;
+pub type SharedNetworks = Arc<Mutex<Networks>>;
+
+#[cfg(target_os = "linux")]
+#[derive(Default)]
+pub struct ProcCpuTracker {
+    pub last_total: u64,
+    pub last_per_pid: HashMap<u32, u64>,
+}
+
+#[derive(Clone)]
+pub struct AppState {
+    pub sys: SharedSystem,
+    pub components: SharedComponents,
+    pub disks: SharedDisks,
+    pub networks: SharedNetworks,
+    pub hostname: String,
+
+    // For correct per-process CPU% using /proc deltas (Linux only path uses this tracker)
+    #[cfg(target_os = "linux")]
+    pub proc_cpu: Arc<Mutex<ProcCpuTracker>>,
+
+    // Connection tracking (to allow future idle sleeps if desired)
+    pub client_count: Arc<AtomicUsize>,
+
+    pub auth_token: Option<String>,
+    // GPU negative cache (probe once). gpu_checked=true after first attempt; gpu_present reflects result.
+    pub gpu_checked: Arc<AtomicBool>,
+    pub gpu_present: Arc<AtomicBool>,
+
+    // Lightweight on-demand caches (TTL based) to cap CPU under bursty polling.
+    pub cache_metrics: Arc<Mutex<CacheEntry<crate::types::Metrics>>>,
+    pub cache_disks: Arc<Mutex<CacheEntry<Vec<crate::types::DiskInfo>>>>,
+    pub cache_processes: Arc<Mutex<CacheEntry<crate::types::ProcessesPayload>>>,
+}
+
+#[derive(Clone, Debug)]
+pub struct CacheEntry<T> {
+    pub at: Option<Instant>,
+    pub value: Option<T>,
+}
+
+impl<T> CacheEntry<T> {
+    pub fn new() -> Self {
+        Self {
+            at: None,
+            value: None,
+        }
+    }
+    pub fn is_fresh(&self, ttl: Duration) -> bool {
+        self.at.is_some_and(|t| t.elapsed() < ttl) && self.value.is_some()
+    }
+    pub fn set(&mut self, v: T) {
+        self.value = Some(v);
+        self.at = Some(Instant::now());
+    }
+    pub fn take_clone(&self) -> Option<T>
+    where
+        T: Clone,
+    {
+        self.value.clone()
+    }
+}
+
+impl AppState {
+    pub fn new() -> Self {
+        let sys = System::new();
+        let components = Components::new_with_refreshed_list();
+        let disks = Disks::new_with_refreshed_list();
+        let networks = Networks::new_with_refreshed_list();
+
+        Self {
+            sys: Arc::new(Mutex::new(sys)),
+            components: Arc::new(Mutex::new(components)),
+            disks: Arc::new(Mutex::new(disks)),
+            networks: Arc::new(Mutex::new(networks)),
+            hostname: System::host_name().unwrap_or_else(|| "unknown".into()),
+            #[cfg(target_os = "linux")]
+            proc_cpu: Arc::new(Mutex::new(ProcCpuTracker::default())),
+            client_count: Arc::new(AtomicUsize::new(0)),
+            auth_token: std::env::var("SOCKTOP_TOKEN")
+                .ok()
+                .filter(|s| !s.is_empty()),
+            gpu_checked: Arc::new(AtomicBool::new(false)),
+            gpu_present: Arc::new(AtomicBool::new(false)),
+            cache_metrics: Arc::new(Mutex::new(CacheEntry::new())),
+            cache_disks: Arc::new(Mutex::new(CacheEntry::new())),
+            cache_processes: Arc::new(Mutex::new(CacheEntry::new())),
+        }
+    }
+}

socktop_agent/src/tls.rs

@@ -0,0 +1,91 @@
+use rcgen::{CertificateParams, DistinguishedName, DnType, IsCa, SanType};
+use std::{
+    fs,
+    io::Write,
+    net::{IpAddr, Ipv4Addr},
+    path::{Path, PathBuf},
+};
+use time::{Duration, OffsetDateTime};
+
+fn config_dir() -> PathBuf {
+    std::env::var_os("XDG_CONFIG_HOME")
+        .map(PathBuf::from)
+        .or_else(|| std::env::var_os("HOME").map(|h| Path::new(&h).join(".config")))
+        .unwrap_or_else(|| PathBuf::from("."))
+        .join("socktop_agent")
+        .join("tls")
+}
+
+pub fn cert_paths() -> (PathBuf, PathBuf) {
+    let dir = config_dir();
+    (dir.join("cert.pem"), dir.join("key.pem"))
+}
+
+pub fn ensure_self_signed_cert() -> anyhow::Result<(PathBuf, PathBuf)> {
+    let (cert_path, key_path) = cert_paths();
+    if cert_path.exists() && key_path.exists() {
+        return Ok((cert_path, key_path));
+    }
+    fs::create_dir_all(cert_path.parent().unwrap())?;
+
+    let hostname = hostname::get()
+        .ok()
+        .and_then(|s| s.into_string().ok())
+        .unwrap_or_else(|| "localhost".to_string());
+
+    let mut params = CertificateParams::new(vec![hostname.clone(), "localhost".into()])?;
+    params
+        .subject_alt_names
+        .push(SanType::IpAddress(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1))));
+    params.subject_alt_names.push(SanType::IpAddress(IpAddr::V6(
+        ::std::net::Ipv6Addr::LOCALHOST,
+    )));
+    params
+        .subject_alt_names
+        .push(SanType::IpAddress(IpAddr::V4(Ipv4Addr::UNSPECIFIED)));
+
+    // Allow operator to provide extra SANs (comma-separated), e.g. IPs or DNS names
+    if let Ok(extra) = std::env::var("SOCKTOP_AGENT_EXTRA_SANS") {
+        for raw in extra.split(',') {
+            let s = raw.trim();
+            if s.is_empty() {
+                continue;
+            }
+            if let Ok(ip) = s.parse::<IpAddr>() {
+                params.subject_alt_names.push(SanType::IpAddress(ip));
+            } else {
+                match s.to_string().try_into() {
+                    Ok(dns) => params.subject_alt_names.push(SanType::DnsName(dns)),
+                    Err(_) => eprintln!("socktop_agent: ignoring invalid SAN entry: {s}"),
+                }
+            }
+        }
+    }
+
+    let mut dn = DistinguishedName::new();
+    dn.push(DnType::CommonName, hostname.clone());
+    params.distinguished_name = dn;
+    params.is_ca = IsCa::NoCa;
+    // Dynamic validity: start slightly in the past to avoid clock skew issues, end ~397 days later
+    let now = OffsetDateTime::now_utc();
+    params.not_before = now - Duration::minutes(5);
+    params.not_after = now + Duration::days(397);
+
+    // Generate key pair (default is ECDSA P256 SHA256)
+    let key_pair = rcgen::KeyPair::generate()?; // defaults to ECDSA P256 SHA256
+    let cert = params.self_signed(&key_pair)?;
+    let cert_pem = cert.pem();
+    let key_pem = key_pair.serialize_pem();
+
+    let mut f = fs::File::create(&cert_path)?;
+    f.write_all(cert_pem.as_bytes())?;
+    let mut k = fs::File::create(&key_path)?;
+    k.write_all(key_pem.as_bytes())?;
+
+    println!(
+        "socktop_agent: generated self-signed TLS certificate at {}",
+        cert_path.display()
+    );
+    println!("socktop_agent: private key at {}", key_path.display());
+    Ok((cert_path, key_path))
+}

socktop_agent/src/types.rs

@@ -0,0 +1,49 @@
+//! Data types sent to the client over WebSocket.
+//! Keep this module minimal and stable — it defines the wire format.
+
+use crate::gpu::GpuMetrics;
+use serde::Serialize;
+
+#[derive(Debug, Clone, Serialize)]
+pub struct DiskInfo {
+    pub name: String,
+    pub total: u64,
+    pub available: u64,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct NetworkInfo {
+    pub name: String,
+    pub received: u64,
+    pub transmitted: u64,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct ProcessInfo {
+    pub pid: u32,
+    pub name: String,
+    pub cpu_usage: f32,
+    pub mem_bytes: u64,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct Metrics {
+    pub cpu_total: f32,
+    pub cpu_per_core: Vec<f32>,
+    pub mem_total: u64,
+    pub mem_used: u64,
+    pub swap_total: u64,
+    pub swap_used: u64,
+    pub hostname: String,
+    pub cpu_temp_c: Option<f32>,
+    pub disks: Vec<DiskInfo>,
+    pub networks: Vec<NetworkInfo>,
+    pub top_processes: Vec<ProcessInfo>,
+    pub gpus: Option<Vec<GpuMetrics>>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct ProcessesPayload {
+    pub process_count: usize,
+    pub top_processes: Vec<ProcessInfo>,
+}

socktop_agent/src/ws.rs

@@ -0,0 +1,101 @@
+//! WebSocket upgrade and per-connection handler (request-driven).
+
+use axum::{
+    extract::ws::{Message, WebSocket},
+    extract::{Query, State, WebSocketUpgrade},
+    response::Response,
+};
+use flate2::{write::GzEncoder, Compression};
+use futures_util::StreamExt;
+use std::collections::HashMap;
+use std::io::Write;
+
+use crate::metrics::{collect_disks, collect_fast_metrics, collect_processes_all};
+use crate::proto::pb;
+use crate::state::AppState;
+
+pub async fn ws_handler(
+    ws: WebSocketUpgrade,
+    State(state): State<AppState>,
+    Query(q): Query<HashMap<String, String>>,
+) -> Response {
+    // optional auth
+    if let Some(expected) = state.auth_token.as_ref() {
+        if q.get("token") != Some(expected) {
+            return ws.on_upgrade(|socket| async move {
+                let _ = socket.close().await;
+            });
+        }
+    }
+    ws.on_upgrade(move |socket| handle_socket(socket, state))
+}
+
+async fn handle_socket(mut socket: WebSocket, state: AppState) {
+    state
+        .client_count
+        .fetch_add(1, std::sync::atomic::Ordering::Relaxed);
+    while let Some(Ok(msg)) = socket.next().await {
+        match msg {
+            Message::Text(ref text) if text == "get_metrics" => {
+                let m = collect_fast_metrics(&state).await;
+                let _ = send_json(&mut socket, &m).await;
+            }
+            Message::Text(ref text) if text == "get_disks" => {
+                let d = collect_disks(&state).await;
+                let _ = send_json(&mut socket, &d).await;
+            }
+            Message::Text(ref text) if text == "get_processes" => {
+                let payload = collect_processes_all(&state).await;
+                // Map to protobuf message
+                let rows: Vec<pb::Process> = payload
+                    .top_processes
+                    .into_iter()
+                    .map(|p| pb::Process {
+                        pid: p.pid,
+                        name: p.name,
+                        cpu_usage: p.cpu_usage,
+                        mem_bytes: p.mem_bytes,
+                    })
+                    .collect();
+                let pb = pb::Processes {
+                    process_count: payload.process_count as u64,
+                    rows,
+                };
+                let mut buf = Vec::with_capacity(8 * 1024);
+                if prost::Message::encode(&pb, &mut buf).is_err() {
+                    let _ = socket.send(Message::Close(None)).await;
+                } else {
+                    // compress if large
+                    if buf.len() <= 768 {
+                        let _ = socket.send(Message::Binary(buf)).await;
+                    } else {
+                        let mut enc = GzEncoder::new(Vec::new(), Compression::fast());
+                        if enc.write_all(&buf).is_ok() {
+                            let bin = enc.finish().unwrap_or(buf);
+                            let _ = socket.send(Message::Binary(bin)).await;
+                        } else {
+                            let _ = socket.send(Message::Binary(buf)).await;
+                        }
+                    }
+                }
+            }
+            Message::Close(_) => break,
+            _ => {}
+        }
+    }
+    state
+        .client_count
+        .fetch_sub(1, std::sync::atomic::Ordering::Relaxed);
+}
+
+// Small, cheap gzip for larger payloads; send text for small.
+async fn send_json<T: serde::Serialize>(ws: &mut WebSocket, value: &T) -> Result<(), axum::Error> {
+    let json = serde_json::to_string(value).expect("serialize");
+    if json.len() <= 768 {
+        return ws.send(Message::Text(json)).await;
+    }
+    let mut enc = GzEncoder::new(Vec::new(), Compression::fast());
+    enc.write_all(json.as_bytes()).ok();
+    let bin = enc.finish().unwrap_or_else(|_| json.into_bytes());
+    ws.send(Message::Binary(bin)).await
+}

socktop_agent/tests/cli_args.rs

@@ -0,0 +1,28 @@
+//! CLI arg parsing tests for socktop_agent (server)
+use std::process::Command;
+
+#[test]
+fn test_help_and_port_short_long() {
+    // We verify port flags are accepted by ensuring the process starts (then we kill quickly).
+    // Use an unlikely port to avoid conflicts.
+    let exe = env!("CARGO_BIN_EXE_socktop_agent");
+
+    // TLS enabled with long --port
+    let mut child = Command::new(exe)
+        .args(["--enableSSL", "--port", "9555"])
+        .spawn()
+        .expect("spawn agent");
+    // Give it a moment to bind
+    std::thread::sleep(std::time::Duration::from_millis(150));
+    let _ = child.kill();
+    let _ = child.wait();
+
+    // TLS enabled with short -p
+    let mut child2 = Command::new(exe)
+        .args(["--enableSSL", "-p", "9556"])
+        .spawn()
+        .expect("spawn agent");
+    std::thread::sleep(std::time::Duration::from_millis(150));
+    let _ = child2.kill();
+    let _ = child2.wait();
+}

socktop_agent/tests/port_parse.rs

@@ -0,0 +1,40 @@
+//! Unit test for port parsing logic moved out of `main.rs`.
+
+fn parse_port<I: IntoIterator<Item = String>>(args: I, default_port: u16) -> u16 {
+    let mut it = args.into_iter();
+    let _ = it.next(); // program name
+    let mut long: Option<String> = None;
+    let mut short: Option<String> = None;
+    while let Some(a) = it.next() {
+        match a.as_str() {
+            "--port" => long = it.next(),
+            "-p" => short = it.next(),
+            _ if a.starts_with("--port=") => {
+                if let Some((_, v)) = a.split_once('=') {
+                    long = Some(v.to_string());
+                }
+            }
+            _ => {}
+        }
+    }
+    long.or(short)
+        .and_then(|s| s.parse::<u16>().ok())
+        .unwrap_or(default_port)
+}
+
+#[test]
+fn port_long_short_and_assign() {
+    assert_eq!(
+        parse_port(vec!["agent".into(), "--port".into(), "9001".into()], 8443),
+        9001
+    );
+    assert_eq!(
+        parse_port(vec!["agent".into(), "-p".into(), "9002".into()], 8443),
+        9002
+    );
+    assert_eq!(
+        parse_port(vec!["agent".into(), "--port=9003".into()], 8443),
+        9003
+    );
+    assert_eq!(parse_port(vec!["agent".into()], 8443), 8443);
+}

socktop_agent/tests/tls_cert_creation.rs

@@ -0,0 +1,59 @@
+use assert_cmd::prelude::*;
+use std::fs;
+use std::path::PathBuf;
+use std::process::Command;
+use std::time::Duration;
+use std::time::Instant;
+
+fn expected_paths(config_home: &std::path::Path) -> (PathBuf, PathBuf) {
+    let base = config_home.join("socktop_agent").join("tls");
+    (base.join("cert.pem"), base.join("key.pem"))
+}
+
+#[test]
+fn generates_self_signed_cert_and_key_in_xdg_path() {
+    // Create an isolated fake XDG_CONFIG_HOME
+    let tmpdir = tempfile::tempdir().expect("tempdir");
+    let xdg = tmpdir.path().to_path_buf();
+
+    // Run the agent once with --enableSSL, short timeout so it exits quickly when killed
+    let mut cmd = Command::cargo_bin("socktop_agent").expect("binary exists");
+    // Bind to an ephemeral port (-p 0) to avoid conflicts/flakes
+    cmd.env("XDG_CONFIG_HOME", &xdg)
+        .arg("--enableSSL")
+        .arg("-p")
+        .arg("0");
+
+    // Spawn the process and poll for cert generation
+    let mut child = cmd.spawn().expect("spawn agent");
+
+    // Poll up to ~3s for files to appear to avoid timing flakes
+    let (cert_path, key_path) = expected_paths(&xdg);
+    let start = Instant::now();
+    let timeout = Duration::from_millis(3000);
+    let interval = Duration::from_millis(50);
+    while start.elapsed() < timeout {
+        if cert_path.exists() && key_path.exists() {
+            break;
+        }
+        std::thread::sleep(interval);
+    }
+
+    // Terminate the process regardless
+    let _ = child.kill();
+    let _ = child.wait();
+
+    // Verify files exist at expected paths
+    assert!(
+        cert_path.exists(),
+        "cert not found at {}",
+        cert_path.display()
+    );
+    assert!(key_path.exists(), "key not found at {}", key_path.display());
+
+    // Also ensure they are non-empty
+    let cert_md = fs::metadata(&cert_path).expect("cert metadata");
+    let key_md = fs::metadata(&key_path).expect("key metadata");
+    assert!(cert_md.len() > 0, "cert is empty");
+    assert!(key_md.len() > 0, "key is empty");
+}