Files

T

wonder 00c1839635 feat: migrate database from SQLite to MySQL with .env configuration

- Replace go-sqlite3 with go-sql-driver/mysql (pure Go, no CGO needed)
- Add joho/godotenv for .env file loading
- Rewrite database/db.go with MySQL-compatible DDL (BIGINT AUTO_INCREMENT, InnoDB, utf8mb4)
- Convert all SQLite-specific SQL: INSERT OR IGNORE → INSERT IGNORE,
  INSERT OR REPLACE → INSERT ... ON DUPLICATE KEY UPDATE,
  datetime('now') → NOW(), date arithmetic → DATE_SUB()
- Add MySQL config fields to config.go (host/port/user/password/database)
- Add .env.example with connection parameter template
- Update Dockerfile: remove CGO/gcc/musl dependency, smaller build
- Update docker-compose.yml: add MySQL service container with healthcheck
- Update CLAUDE.md documentation

2026-06-20 22:40:46 +08:00

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CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

PR-Helper is a self-hosted web service that auto-generates PR descriptions from Git history and performs AI-powered code review. Designed for internal/local use only (no auth).

Tech Stack

Backend: Go + Gin + MySQL + go-git
Frontend: Go html/template + HTMX + D3.js + diff2html + Tailwind CSS
LLM: OpenAI-compatible API (SSE streaming)
Deploy: Docker

Build & Run

# Build
go build -o pr-helper .

# Configure — copy .env.example to .env and set MySQL credentials
cp .env.example .env

# Run (requires MySQL server)
./pr-helper
# Server listens on :8080

# Docker (includes MySQL container)
docker compose up --build

Architecture

handlers/   → HTTP handlers (pages + JSON API + SSE endpoints)
services/   → Business logic (git ops, LLM calls, PDF gen, cache management)
models/     → Data models (repository, settings, analysis)
database/   → MySQL init and migrations
config/     → Configuration loading
templates/  → Go HTML templates (layouts/, pages/, partials/)
static/     → CSS (Tailwind output), JS (graph, diff-viewer, sse), vendor libs

Data flow: Browser ↔ Gin handlers → services (git/llm) → MySQL + filesystem (data/)

Key service layer responsibilities:

services/git.go — clone, diff, graph data extraction via go-git
services/llm.go — OpenAI-compatible API calls with SSE streaming
services/generate.go — PR description generation (commits + diff → LLM → structured output)
services/review.go — AI code review (per-file analysis + summary, Top-N strategy for large diffs)
services/cache.go — repository cache lifecycle (clone, expiry cleanup)

Key Patterns

SSE streaming: Clone progress, PR generation, and AI review all use Server-Sent Events. Handlers write event: / data: lines; frontend consumes via static/js/sse.js.
Large diff handling: Diffs are split per-file, sorted by change size, truncated to Top-N (configurable, default 20). Each file analyzed independently by LLM, then a summary prompt aggregates results.
Review notes: Three-level scoping — overall, file, suggestion — stored in review_notes table. AI output is read-only; users append notes separately.
Diff rendering: diff2html in Split view by default. AI review suggestions are inline-embedded next to code lines via line + side fields from SSE.

Frontend Libraries (vendored in static/lib/)

HTMX 2.x, D3.js 7.x, diff2html 3.x, highlight.js 11.x
Tailwind CSS compiled to static/css/style.css
Custom JS: sse.js (SSE client), graph.js (D3 git graph with click selection), diff-viewer.js (diff2html + file tree sidebar), review-inline.js (inline AI suggestions)

Data Storage

MySQL database pr_helper — settings (KV), repositories, analyses, review_notes
Cloned repos cached at data/repos/ with configurable expiry (default 7 days)
Database connection configured via .env file (see .env.example)

Development Notes

No authentication — do not expose to public internet.
LLM prompts are in services/generate.go and services/review.go; model/endpoint/key are configurable via the settings page.
SSE event formats are defined in handlers/generate.go and handlers/review.go (server) and consumed by static/js/sse.js (client).

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