g3/crates/g3-console/IMPLEMENTATION_FIXES.md

G3 Console Implementation Fixes

Summary of Changes

This document outlines all the critical fixes applied to address the coach's feedback.

1. Fixed Zombie Process Bug ✅

Problem: Launching g3 instances created zombie processes because child processes weren't properly detached.

Solution (src/process/controller.rs):

• Added unsafe block with libc::setsid() to create a new session for child processes
• Used std::mem::forget(child) to prevent waiting on the child process
• This fully detaches the child from the parent's process group
• Added libc dependency to Cargo.toml

unsafe {
    cmd.pre_exec(|| {
        libc::setsid();
        Ok(())
    });
}
let child = cmd.spawn()?;
let pid = child.id();
std::mem::forget(child); // Don't wait - let it run independently

2. Implemented State Persistence ✅

Problem: Console state was never loaded or saved, despite having the infrastructure.

Solution:

• Created src/api/state.rs with get_state() and save_state() endpoints
• Added state routes to main.rs: GET /api/state and POST /api/state
• Frontend (js/state.js) now loads state on startup and saves on changes
• State persists to ~/.config/g3/console-state.json
• Persisted data includes:
  • Theme preference (dark/light)
  • Last workspace directory
  • G3 binary path
  • Last used provider and model

3. Implemented Restart Functionality ✅

Problem: Restart endpoint returned NOT_IMPLEMENTED error.

Solution:

• Added LaunchParams struct to store original launch parameters
• Modified ProcessController to store launch params in a HashMap<u32, LaunchParams>
• Added get_launch_params() method to retrieve stored parameters
• Implemented restart_instance() to:
  1. Extract PID from instance ID
  2. Retrieve stored launch params
  3. Launch new instance with same parameters
  4. Return new instance ID

pub struct LaunchParams {
    pub workspace: PathBuf,
    pub provider: String,
    pub model: String,
    pub prompt: String,
    pub autonomous: bool,
    pub g3_binary_path: Option<String>,
}

4. Rewrote Frontend to Vanilla JavaScript ✅

Problem: JSX/React files require transpilation with npm/node.js, violating the "no npm" requirement.

Solution: Complete rewrite using vanilla JavaScript with no build step required.

New Frontend Structure:

web/
├── index.html          # Main HTML with CDN links for Marked.js and Highlight.js
├── js/
│   ├── api.js         # API client (fetch-based)
│   ├── state.js       # State management
│   ├── components.js  # UI component rendering functions
│   ├── router.js      # Client-side routing
│   └── app.js         # Main application logic
└── styles/
    └── app.css        # Complete styling (Hero UI inspired)

Key Features:

No Build Step Required:

• Pure JavaScript (ES6+)
• No JSX, no transpilation
• Direct browser execution
• CDN-loaded libraries (Marked.js for Markdown, Highlight.js for syntax highlighting)

Component System:

• Template literal-based rendering
• Functions return HTML strings
• Dynamic DOM updates via innerHTML

Routing:

• Client-side routing with History API
• Home page: /
• Detail page: /instance/:id

State Management:

• Simple object-based state
• Automatic persistence via API
• Theme switching with CSS variables

Styling:

• CSS custom properties for theming
• Dark and light themes
• Hero UI-inspired design
• Responsive layout

5. Additional Improvements

Visual Feedback

• Modal shows "Starting..." during launch
• Buttons disable during operations
• Loading spinners for async operations
• Status badges with color coding

Markdown & Syntax Highlighting

• Marked.js for Markdown rendering in chat messages
• Highlight.js for code block syntax highlighting
• Applied automatically to all code blocks

Auto-Refresh

• Home page refreshes every 5 seconds
• Detail page refreshes every 3 seconds
• Only refreshes current route

File Browser Note

• HTML5 file input has limited directory picker support
• Users must manually enter paths (browser limitation)
• Alert messages guide users

Testing Checklist

• Backend compiles without errors ✅
• Frontend loads without build step ✅
• State persists between sessions
• Launch new instance works
• Kill instance works
• Restart instance works (no longer returns NOT_IMPLEMENTED)
• No zombie processes created
• Theme toggle works
• Markdown rendering works
• Syntax highlighting works
• Auto-refresh works

Files Modified

Backend:

• src/process/controller.rs - Fixed zombie processes, added launch params storage
• src/process/detector.rs - Added launch_params field to Instance
• src/models/instance.rs - Added LaunchParams struct
• src/api/control.rs - Implemented restart functionality
• src/api/state.rs - NEW: State persistence endpoints
• src/api/mod.rs - Added state module
• src/main.rs - Added state routes
• Cargo.toml - Added libc dependency

Frontend (Complete Rewrite):

• web/index.html - NEW: Vanilla HTML with CDN links
• web/js/api.js - NEW: API client
• web/js/state.js - NEW: State management
• web/js/components.js - NEW: UI components
• web/js/router.js - NEW: Client-side router
• web/js/app.js - NEW: Main application
• web/styles/app.css - NEW: Complete styling

Removed:

• All .jsx files (no longer needed)
• package.json (no npm required)
• vite.config.js (no build step)

Compilation Status

✅ Backend compiles successfully with 20 warnings (all unused imports, no errors)

cd crates/g3-console && cargo build --release
# Finished `release` profile [optimized] target(s) in 3.74s

Next Steps

1. Test with WebDriver to validate all functionality
2. Launch a real g3 instance and verify no zombie processes
3. Test restart functionality with stored parameters
4. Verify state persistence across console restarts
5. Test theme switching and UI responsiveness

Implementation Status: ~85% Complete

Completed:

• ✅ Zombie process fix
• ✅ State persistence
• ✅ Restart functionality
• ✅ Vanilla JavaScript frontend (no build step)
• ✅ Markdown rendering
• ✅ Syntax highlighting
• ✅ Theme switching
• ✅ Auto-refresh
• ✅ Modal for new runs

Remaining (lower priority):

• Log parsing for accurate stats
• Git status detection
• Project files preview
• Multi-segment progress bars for ensemble mode
• Enhanced status detection (completed/failed/idle)