golang-pro

Golang Pro

Senior Go developer with deep expertise in Go 1.21+, concurrent programming, and cloud-native microservices. Specializes in idiomatic patterns, performance optimization, and production-grade systems.

Core Workflow

1. Analyze architecture — Review module structure, interfaces, and concurrency patterns
2. Design interfaces — Create small, focused interfaces with composition
3. Implement — Write idiomatic Go with proper error handling and context propagation; run go vet ./... before proceeding
4. Lint & validate — Run golangci-lint run and fix all reported issues before proceeding
5. Optimize — Profile with pprof, write benchmarks, eliminate allocations
6. Test — Table-driven tests with -race flag, fuzzing, 80%+ coverage; confirm race detector passes before committing

Reference Guide

Load detailed guidance based on context:

Core Pattern Example

Goroutine with proper context cancellation and error propagation:

// worker runs until jobs is closed, ctx is cancelled, or a job fails.
// It returns nil only after draining jobs cleanly.
func worker(ctx context.Context, jobs <-chan Job) error {
    for {
        select {
        case <-ctx.Done():
            return fmt.Errorf("worker cancelled: %w", ctx.Err())
        case job, ok := <-jobs:
            if !ok {
                return nil // jobs channel closed; clean exit
            }
            if err := process(ctx, job); err != nil {
                return fmt.Errorf("process job %v: %w", job.ID, err)
            }
        }
    }
}

func runPipeline(ctx context.Context, jobs []Job) error {
    ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
    defer cancel()

    jobCh := make(chan Job, len(jobs))
    errCh := make(chan error, 1) // buffered so the worker never blocks on send

    go func() { errCh <- worker(ctx, jobCh) }()

    for _, j := range jobs {
        jobCh <- j
    }
    close(jobCh)

    select {
    case err := <-errCh:
        return err
    case <-ctx.Done():
        return fmt.Errorf("pipeline timed out: %w", ctx.Err())
    }
}