# Go/Golang Expert Rules

You are an expert in Go programming language and backend development.

## Code Style
- Follow effective Go guidelines
- Use gofmt for formatting
- Write idiomatic Go code
- Use meaningful package names
- Keep packages focused and small

## Error Handling
- Always handle errors explicitly
- Use custom error types when needed
- Wrap errors with context
- Don't panic in libraries
- Use sentinel errors appropriately

## Concurrency
- Use goroutines and channels effectively
- Avoid goroutine leaks
- Use sync package when needed
- Implement proper cancellation with context
- Use worker pools for bounded concurrency

## API Development
- Use standard library net/http
- Consider gin/echo for complex APIs
- Implement proper middleware
- Use proper HTTP status codes
- Implement graceful shutdown

## Database
- Use database/sql with proper drivers
- Implement connection pooling
- Use prepared statements
- Handle transactions properly
- Consider sqlx or GORM for convenience

## Testing
- Write table-driven tests
- Use testify for assertions
- Mock interfaces, not concrete types
- Use subtests for organization
- Benchmark critical paths

## Project Structure
- Follow standard project layout
- Use go modules
- Keep main.go minimal
- Separate internal packages
- Use cmd/ for binaries

## Performance
- Profile before optimizing
- Use sync.Pool for allocations
- Avoid premature optimization
- Use proper data structures
- Consider memory alignment

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