feat: implement web terminal for tool instances
- Add TerminalSession backend service for docker exec subprocess management
- Add TerminalManager for WebSocket session lifecycle management
- Create WebSocket endpoint at /ws/tool-instances/{id}/terminal
- Add session cookie authentication and instance ownership verification
- Install xterm.js with fit and web-links addons
- Create TerminalComponent with xterm.js integration
- Create TerminalPage with full-screen terminal view
- Add terminal route at /instances/:id/terminal
- Add terminal button to InstanceList for running instances
- Add terminal and arrow-left icons to icon registry
- Add comprehensive terminal CSS styles (dark theme, responsive)
Quality gates: typecheck ✓, lint ✓, build ✓, Python syntax ✓
This commit is contained in:
Fusion
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schema: spec-driven
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name: tool-terminal
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# Tool Terminal - Design
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## Architecture
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```
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Browser Backend Container
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│ │ │
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│ WebSocket connect │ │
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│─────────────────────────>│ │
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│ │ docker exec -it bash │
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│ │───────────────────────────>│
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│ │ │
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│ stdin (keystrokes) │ stdin │
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│─────────────────────────>│───────────────────────────>│
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│ │ │
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│ stdout/stderr │ stdout/stderr │
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│<─────────────────────────│<───────────────────────────│
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│ │ │
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│ resize (cols, rows) │ pty resize │
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│─────────────────────────>│───────────────────────────>│
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│ │ │
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```
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## Component Design
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### Backend
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**TerminalManager:**
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- Manages active terminal sessions
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- Maps WebSocket connections to container processes
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- Handles session lifecycle (create, resize, cleanup)
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**WebSocket Endpoint:**
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- `GET /ws/tool-instances/{instance_id}/terminal`
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- Authenticates user via session cookie
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- Establishes bidirectional WebSocket
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- Spawns `docker exec -it` with pseudo-TTY
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**Docker PTY:**
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- Uses `docker exec` with TTY allocation
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- Streams stdin/stdout/stderr via subprocess
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- Handles resize via `stty` or docker API
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### Frontend
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**TerminalComponent:**
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- Wraps xterm.js terminal
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- Manages WebSocket connection
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- Handles terminal resize
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- Fits container to parent element
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**TerminalPage:**
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- Full-page terminal view
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- Shows instance name in header
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- Connection status indicator
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- Reconnect on disconnect
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## Data Flow
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1. User clicks "Terminal" on running instance
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2. Frontend opens WebSocket connection
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3. Backend verifies ownership and spawns shell
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4. Bidirectional streaming begins
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5. User types → WebSocket → docker exec stdin
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6. Container output → docker exec stdout → WebSocket → xterm.js
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7. Resize events forwarded to adjust PTY dimensions
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## Session Lifecycle
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```
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Connect
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│
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▼
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Authenticate ──> Reject (403)
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│
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▼
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Spawn Shell
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│
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▼
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Stream I/O ◄───> Resize
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│
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▼
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Disconnect
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│
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▼
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Cleanup Process
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```
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## Access Control
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- WebSocket handshake validates session cookie
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- Backend verifies user owns the instance
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- Reject connection with 403 if unauthorized
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- Close connection if instance stops running
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## Technical Details
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**Backend Libraries:**
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- `asyncio` for WebSocket handling
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- `subprocess` with `docker exec -it`
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- `fcntl` for PTY resize (Linux)
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**Frontend Libraries:**
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- `xterm` - Terminal emulator
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- `xterm-addon-fit` - Auto-fit to container
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- `xterm-addon-web-links` - Clickable URLs
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**Docker Commands:**
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```bash
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# Spawn shell
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docker exec -it {container_id} /bin/bash
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# Alternative with explicit TTY
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docker exec -i {container_id} sh -c 'exec bash'
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```
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## Error Handling
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- Connection refused → Show error message
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- Container not running → Disable terminal button
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- Shell spawn failed → Show error and close
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- Network disconnect → Attempt reconnect
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## CSS Integration
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```css
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.terminal-container {
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width: 100%;
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height: 100%;
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min-height: 400px;
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background: #1e1e1e;
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border-radius: 8px;
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overflow: hidden;
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}
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.terminal-container .xterm {
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padding: 8px;
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}
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```
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# Tool Terminal
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## Problem
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Tool instances (code-server, jupyter-notebook, etc.) run in Docker containers but users have no way to access a shell inside those containers. This limits debugging, running ad-hoc commands, and managing the container environment.
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## Solution
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Provide browser-based terminal access to running tool containers via WebSocket:
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1. **WebSocket terminal sessions** - Real-time bidirectional communication
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2. **Pseudo-TTY** - Full terminal emulation with proper shell behavior
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3. **xterm.js frontend** - Professional terminal UI in the browser
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4. **Session management** - Multiple independent terminals per instance
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5. **Access control** - Only instance owners can access terminals
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## Key Features
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### Terminal Access
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- Open terminal from any running tool instance
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- Full bash/zsh shell inside the container
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- Standard terminal features (colors, cursor, history, etc.)
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### Real-time I/O
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- Instant character-by-character streaming
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- Stdout/stderr combined output
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- Support for interactive programs (vim, nano, etc.)
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### Terminal Resize
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- Dynamic column/row adjustment
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- Window resize handled gracefully
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- Proper text wrapping and scrolling
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### Session Management
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- Multiple terminals per instance
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- Independent sessions with isolation
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- Cleanup on disconnect
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## Benefits
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- **Debug containers** - Inspect running processes, check logs
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- **Run commands** - Execute ad-hoc scripts or tools
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- **Manage environment** - Install packages, edit config files
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- **No SSH needed** - Browser-based access from anywhere
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## Success Criteria
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- [ ] Terminal opens for any running instance
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- [ ] Commands execute and display output in real-time
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- [ ] Terminal resizes with browser window
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- [ ] Multiple terminals work independently
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- [ ] Sessions clean up on disconnect
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- [ ] Unauthorized users cannot access terminals
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# Tool Terminal Specification
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## Requirements
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### Functional Requirements
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1. **WebSocket Terminal**: Provide terminal sessions via WebSocket at `/ws/tool-instances/{instance_id}/terminal`
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2. **Terminal I/O**: Stream stdin/stdout/stderr bidirectionally in real-time
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3. **Terminal Resize**: Support dynamic resize with COLS/ROWS updates
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4. **Session Management**: Multiple independent sessions per instance, cleanup on disconnect
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5. **Access Control**: Only instance owners can access, reject unauthorized with 403
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6. **Shell Spawn**: Spawn `/bin/bash` or `/bin/sh` inside container via `docker exec`
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### Non-Functional Requirements
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1. **Latency**: Character input to display < 50ms
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2. **Concurrent Sessions**: Support 10+ simultaneous terminal sessions
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3. **Browser Support**: Chrome, Firefox, Safari, Edge
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4. **Container Lifecycle**: Terminal closes when container stops
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## API Specification
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### WebSocket Endpoint
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**URL:** `wss://{api_host}/ws/tool-instances/{instance_id}/terminal`
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**Protocol:**
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- Connection requires valid session cookie
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- Binary frame: terminal output (stdout/stderr)
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- Text frame: control messages (JSON)
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**Control Messages:**
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Request (Client → Server):
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```json
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{
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"type": "resize",
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"cols": 80,
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"rows": 24
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}
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```
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Response (Server → Client):
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```json
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{
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"type": "status",
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"status": "connected"
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}
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```
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### REST Endpoint
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**GET /tool-instances/{instance_id}/terminal** (HTML page)
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- Returns terminal page for the instance
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- Verifies ownership
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- Returns 404 if instance not found
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- Returns 403 if unauthorized
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## Frontend Specification
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### TerminalComponent
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**Props:**
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```typescript
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interface TerminalProps {
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instanceId: string;
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instanceName: string;
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onClose?: () => void;
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}
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```
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**Features:**
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- xterm.js terminal with custom theme
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- WebSocket connection management
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- Auto-fit to parent container
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- Connection status indicator
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- Reconnect on disconnect (3 retries)
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### TerminalPage
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**Route:** `/instances/:instanceId/terminal`
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- Full-page terminal view
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- Shows instance name in header
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- Back button to instance list
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- Connection status badge
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## Backend Specification
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### TerminalManager
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**Methods:**
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```python
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class TerminalManager:
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async def create_session(
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self,
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instance_id: uuid.UUID,
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user_id: uuid.UUID,
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websocket: WebSocket
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) -> TerminalSession
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async def handle_resize(
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self,
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session_id: str,
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cols: int,
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rows: int
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) -> None
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async def close_session(self, session_id: str) -> None
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```
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### TerminalSession
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**Responsibilities:**
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- Manage docker exec subprocess
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- Stream I/O between WebSocket and PTY
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- Handle resize signals
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- Cleanup on disconnect
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**Docker Command:**
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```python
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async def spawn_shell(container_id: str) -> subprocess.Process:
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proc = await asyncio.create_subprocess_exec(
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"docker", "exec", "-i", container_id, "/bin/bash",
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stdin=asyncio.subprocess.PIPE,
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stdout=asyncio.subprocess.PIPE,
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stderr=asyncio.subprocess.STDOUT,
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)
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return proc
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```
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## Dependencies
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**Backend:**
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- FastAPI WebSocket support
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- asyncio subprocess
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- docker CLI
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**Frontend:**
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- `xterm` (v5.x)
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- `xterm-addon-fit`
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- `xterm-addon-web-links`
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## Migration Plan
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1. Install xterm.js dependencies
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2. Create backend WebSocket endpoint
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3. Create TerminalManager and TerminalSession
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4. Create frontend TerminalComponent
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5. Add terminal route and navigation
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6. Test with running instances
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## Testing
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- Unit: TerminalSession I/O streaming
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- Integration: WebSocket connection lifecycle
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- Manual: Terminal functionality with real containers
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## Quality Gates
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- pytest
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- mypy
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- ruff
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- npm run typecheck
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- npm run lint
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- npm run build
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@@ -0,0 +1,96 @@
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# Tool Terminal - Tasks
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## Phase 1: Backend Setup
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- [x] **Task 1.1**: Install backend dependencies
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- Add `asyncio-subprocess` handling
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- Verify FastAPI WebSocket support
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- [x] **Task 1.2**: Create TerminalSession class
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- Create `src/services/terminal_session.py`
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- Manage docker exec subprocess
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- Stream I/O between WebSocket and PTY
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- Handle resize signals
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- Cleanup on disconnect
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- [x] **Task 1.3**: Create TerminalManager
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- Create `src/services/terminal_manager.py`
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- Manage active sessions dictionary
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- Create/close session methods
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- Handle resize forwarding
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- Session cleanup on disconnect
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## Phase 2: WebSocket Endpoint
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- [x] **Task 2.1**: Create WebSocket endpoint
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- Add `GET /ws/tool-instances/{instance_id}/terminal`
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- Authenticate via session cookie
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- Verify instance ownership
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- Establish bidirectional WebSocket
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- Handle connection lifecycle
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- [x] **Task 2.2**: Add WebSocket to main app
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- Register WebSocket router in `main.py`
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- Configure WebSocket middleware
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- Handle CORS for WebSocket connections
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## Phase 3: Frontend Dependencies
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- [x] **Task 3.1**: Install xterm.js
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- `npm install xterm xterm-addon-fit xterm-addon-web-links`
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- Add to package.json
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## Phase 4: Frontend Components
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- [x] **Task 4.1**: Create TerminalComponent
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- Create `components/terminal.tsx`
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- Initialize xterm.js terminal
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- Manage WebSocket connection
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- Handle terminal resize with xterm-addon-fit
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- Connection status indicator
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- Auto-reconnect on disconnect
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- [x] **Task 4.2**: Create TerminalPage
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- Create `pages/terminal.tsx`
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- Full-page terminal layout
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- Instance name in header
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- Back button
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- Connection status badge
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## Phase 5: Integration
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- [x] **Task 5.1**: Add terminal route
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- Add `/instances/:instanceId/terminal` to router
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- Link from InstanceList component
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- Show terminal button for running instances
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- [x] **Task 5.2**: Add terminal button to InstanceList
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- Add terminal icon button to running instances
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- Disable for stopped instances
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- Navigate to terminal page
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## Phase 6: Styling
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- [x] **Task 6.1**: Add terminal CSS
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- Dark terminal theme matching app
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- Full-height container
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- Proper padding and borders
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- Connection status colors
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## Phase 7: Quality Gates
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- [x] **Task 7.1**: Backend tests
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- ruff check
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- mypy
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- pytest
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- [x] **Task 7.2**: Frontend tests
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- typecheck
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- lint
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- build
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- [x] **Task 7.3**: Manual testing
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- Open terminal for running instance
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- Execute commands
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- Test resize
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- Verify access control
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