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Implementation Summary: Phase 2.1

This file documents the implementation work completed for Phase 2.1 of the OpenCode integration sprint.

Task Completed

Phase 2.1: Decide execution model (fire-and-poll vs SSE vs synchronous) and extend api/opencode.php to support it

Implementation Details

Architecture & Design Compliance

  • ✅ Followed Front Controller Pattern (routes through index.php)
  • ✅ Maintained flat namespace structure in /view/, /lib/, /api/
  • ✅ Used Shared Library Pattern (OpenCodeClient remains standalone)
  • ✅ Respected API Contract rules (POST-only, JSON responses, method checks)

Key Changes Made

1. Enhanced api/opencode.php

Extended to handle both health probe and command execution:

  • Health Check Endpoint: POST /api/opencode.php (existing behavior preserved)
  • Command Execution Endpoint: POST /api/opencode.php with JSON payload:
{
  "command": "/plan",
  "project_slug": "kanban"
}

2. Command Execution Flow

  • Synchronous execution with extended timeout (2x configured timeout)
  • Command validation against whitelist (/plan, /next, /debug, /review, /document)
  • Project slug validation and directory verification
  • Settings validation for OpenCode enabling

3. API Response Format

{
  "status": "ok|error",
  "output": "command output as string",
  "errors": "error details if any", 
  "commitHash": "git commit hash if available"
}

4. Client-Side Utilities (assets/js/opencode.js)

  • executeCommand() - Core AJAX command execution with error handling
  • executeAndDisplayCommand() - UI display helper function
  • HTML escaping utilities to prevent XSS

Validation & Quality Assurance

  • ✅ PHP syntax validation (php -l)
  • ✅ No git whitespace issues
  • ✅ Backward compatibility maintained
  • ✅ Follows existing project patterns and conventions

Design Choices

Execution Model Chosen: Synchronous with Extended Timeout

Selected option C from the design notes (vs A. Fire-and-poll or B. SSE) because:

  1. Simpler implementation for Phase 2 development
  2. Suitable for immediate execution needs
  3. Provides clear response without additional async complexity
  4. Follows project's approach to incremental development

Files Modified

  • api/opencode.php - Extended functionality
  • NEXT.md - Marked task as completed
  • assets/js/opencode.js - New JavaScript client-side utilities

Next Steps (Phase 2.2)

Prepare for extension of OpenCodeClient with task-id management and progress polling functionality.