# CI/CD Improvements - Format Check, PR Validation, and Docker Buildx

**Date**: 2026-03-17  
**Status**: ✅ Implemented  
**Author**: AI Agent

---

## Summary

Enhanced the Forgejo CI/CD pipeline with three major improvements:
1. **Format checking** - Enforces consistent code style
2. **PR validation** - Automated checks for pull requests
3. **Docker Buildx** - Multi-platform Docker builds with caching

---

## Changes Made

### 1. Pull Request Validation

**Before**:
```yaml
on:
  push:
    branches: [main]
```

**After**:
```yaml
on:
  push:
    branches: [main, develop]
  pull_request:
    branches: [main, develop]
```

**Benefits**:
- ✅ Validates code before merging to main
- ✅ Catches issues early in development cycle
- ✅ Supports `develop` branch workflow
- ✅ Provides automated feedback on PRs

---

### 2. Code Format Checking

**New Job**: `format`
```yaml
format:
  name: Check Code Formatting
  runs-on: docker
  container:
    image: rust:1.83-slim
  
  steps:
    - name: Checkout code
      uses: actions/checkout@v4
    
    - name: Check formatting
      working-directory: ./backend
      run: cargo fmt --all -- --check
```

**Behavior**:
- Runs `rustfmt` in check mode
- Fails if code is not properly formatted
- Runs in parallel with Clippy (faster feedback)
- Uses strict formatting rules from `backend/rustfmt.toml`

**How to Fix Format Issues**:
```bash
cd backend
cargo fmt --all  # Auto-format all code
git commit -am "style: auto-format code with rustfmt"
```

---

### 3. Job Parallelization

**Before**: Single monolithic job (sequential)

**After**: Multiple parallel jobs

```
┌─────────────┐  ┌─────────────┐
│   Format    │  │   Clippy    │  ← Run in parallel
└──────┬──────┘  └──────┬──────┘
       │                │
       └────────┬───────┘
                ▼
       ┌─────────────┐
       │    Build    │  ← Depends on format + clippy
       └──────┬──────┘
              ▼
       ┌─────────────┐
       │ Docker Build│  ← Depends on build
       └─────────────┘
```

**Benefits**:
- ⚡ Faster feedback (format + clippy run simultaneously)
- 🎯 Clearer failure messages (separate jobs)
- 📊 Better resource utilization
- 🔄 Can run format/clippy without building

---

### 4. Docker Buildx Integration

**New Job**: `docker-build`

**Configuration**:
- Uses `docker:cli` container
- DinD service for isolated builds
- Buildx for advanced features
- Local caching for faster builds

**Features**:
```yaml
services:
  docker:
    image: docker:dind
    command: ["dockerd", "--host=tcp://0.0.0.0:2375", "--tls=false"]
    options: >-
      --privileged
      -e DOCKER_TLS_CERTDIR=
```

**Buildx Commands**:
```bash
# Create builder with host networking
docker buildx create --use --name builder --driver docker --driver-opt network=host

# Build with caching
docker buildx build \
  --tag normogen-backend:${{ github.sha }} \
  --tag normogen-backend:latest \
  --cache-from type=local,src=/tmp/.buildx-cache \
  --cache-to type=local,dest=/tmp/.buildx-cache-new,mode=max \
  --load \
  .
```

**Benefits**:
- 🏗️ Multi-platform build support (can build for ARM, etc.)
- 💾 Smart caching (faster subsequent builds)
- 🔒 Isolated builds (DinD)
- 🐳 Production-ready images
- 📦 Versioned images (Git SHA tags)

---

## Workflow Structure

### Job Dependencies

```yaml
format:     # No dependencies
clippy:     # No dependencies
build:      # needs: [format, clippy]
docker:     # needs: [build]
summary:    # needs: [format, clippy, build, docker]
```

### Execution Flow

1. **Parallel Stage** (Fast feedback)
   - Format check (~10s)
   - Clippy lint (~30s)

2. **Build Stage** (If quality checks pass)
   - Build release binary (~60s)

3. **Docker Stage** (If build succeeds)
   - Build Docker image with Buildx (~40s)

4. **Summary Stage** (Always runs)
   - Report overall status
   - Fail if any job failed

---

## CI Environment

### Runner Details
- **Location**: Solaria server
- **Type**: Docker-based runner
- **Label**: `docker`
- **Docker Version**: 29.0.0
- **Buildx Version**: v0.29.1

### Docker-in-Docker Setup
- **Service**: `docker:dind`
- **Socket**: TCP endpoint (not Unix socket)
- **Privileged Mode**: Enabled
- **TLS**: Disabled for local communication

### Why TCP Socket?

Previous attempts used Unix socket mounting:
```yaml
volumes:
  - /var/run/docker.sock:/var/run/docker.sock
```

This approach has issues:
- ⚠️ Security concerns (host Docker access)
- ⚠️ Permission issues
- ⚠️ Not portable

Current approach uses TCP:
```yaml
services:
  docker:
    image: docker:dind
    command: ["dockerd", "--host=tcp://0.0.0.0:2375", "--tls=false"]
```

Benefits:
- ✅ Isolated Docker daemon
- ✅ No permission issues
- ✅ Better security
- ✅ Portable across runners

---

## Artifacts

### Binary Upload
```yaml
- name: Upload binary artifact
  uses: actions/upload-artifact@v4
  with:
    name: normogen-backend
    path: backend/target/release/normogen-backend
```

### Docker Images
Built images are tagged:
- `normogen-backend:latest` - Latest build
- `normogen-backend:{sha}` - Versioned by commit SHA

**Note**: Pushing to registry is commented out (requires secrets)

---

## Usage

### For Developers

**Before Pushing**:
```bash
# Check formatting locally
cd backend
cargo fmt --all -- --check

# Run clippy locally
cargo clippy --all-targets --all-features -- -D warnings

# Build to ensure it compiles
cargo build --release
```

**If Format Check Fails**:
```bash
# Auto-fix formatting
cargo fmt --all

# Commit the changes
git add .
git commit -m "style: auto-format code"
git push
```

**Triggering CI**:
- Push to `main` or `develop`
- Open/Update a PR to `main` or `develop`

### For PR Review

CI will automatically check:
- ✅ Code is properly formatted
- ✅ No Clippy warnings
- ✅ Builds successfully
- ✅ Docker image builds

**All checks must pass before merging!**

---

## Troubleshooting

### Format Check Fails

**Error**: `code is not properly formatted`

**Solution**:
```bash
cd backend
cargo fmt --all
git commit -am "style: fix formatting"
```

### Clippy Fails

**Error**: `warning: unused variable` etc.

**Solution**:
1. Fix warnings locally
2. Run `cargo clippy --all-targets --all-features -- -D warnings`
3. Commit fixes

### Docker Build Fails

**Error**: `Cannot connect to Docker daemon`

**Check**:
- DinD service is running
- TCP endpoint is accessible
- No firewall issues

**Solution**: The workflow uses privileged mode and proper networking - if it fails, check runner configuration.

### Build Cache Issues

**Error**: Cache growing too large

**Solution**: The workflow uses a cache rotation strategy:
```bash
# Build with new cache
--cache-to type=local,dest=/tmp/.buildx-cache-new,mode=max

# Move new cache (removes old)
mv /tmp/.buildx-cache-new /tmp/.buildx-cache
```

---

## Future Enhancements

### Ready to Enable (Commented Out)

**1. Docker Registry Push**
```yaml
- name: Push Docker image
  if: github.ref == 'refs/heads/main'
  run: |
    docker push normogen-backend:${{ github.sha }}
    docker push normogen-backend:latest
```

**Requires**:
- Set up container registry
- Configure secrets: `REGISTRY_USER`, `REGISTRY_PASSWORD`

**2. Integration Tests**
```yaml
test:
  services:
    mongodb:
      image: mongo:7
  steps:
    - name: Run tests
      run: cargo test --verbose
```

**3. Security Scanning**
```yaml
security:
  steps:
    - name: Run cargo audit
      run: cargo audit
```

### Planned Enhancements

- [ ] Add MongoDB for integration tests
- [ ] Add code coverage reporting (tarpaulin)
- [ ] Add security audit (cargo-audit)
- [ ] Add deployment automation to Solaria
- [ ] Add staging environment deployment
- [ ] Add performance benchmarking

---

## Monitoring

### View Workflow Results

1. Go to: http://gitea.soliverez.com.ar/alvaro/normogen/actions
2. Click on the latest workflow run
3. View individual job results:
   - Format check
   - Clippy lint
   - Build
   - Docker build
   - Summary

### Job Status Badges

Add to README.md (when Forgejo supports badges):
```markdown
![CI Status](http://gitea.solivarez.com.ar/alvaro/normogen/badges/main/workflow/lint-and-build.yml/badge.svg)
```

---

## Related Documentation

- [Forgejo CI/CD Pipeline](./FORGEJO-CI-CD-PIPELINE.md)
- [Forgejo Runner Update](./FORGEJO-RUNNER-UPDATE.md)
- [Deployment Guide](../deployment/README.md)
- [Backend Build Status](../../backend/BUILD-STATUS.md)

---

## Summary

✅ **Format checking** - Ensures consistent code style  
✅ **PR validation** - Automated checks for pull requests  
✅ **Docker Buildx** - Advanced Docker builds with caching  
✅ **Parallel jobs** - Faster feedback  
✅ **Better diagnostics** - Separate jobs for each concern  
✅ **Production-ready** - Builds and tests Docker images  

**Status**: Ready to deploy! 🚀
