KeiSeiKit-1.0/_blocks/stack-go-server.md
denis 0b901cf2f9 feat: KeiSeiKit v0.1.0 — initial public release
Generic Constructor-Pattern agent kit for Claude Code. Zero personal data,
fully English, MIT-licensed.

Contents:
- 34 reusable blocks (baseline, rules, stack/deploy/domain/api/scraper)
- 14 cross-project agent manifests (code/ml/infra/researcher/critic/...)
- 6 portable skills (/new-agent, /research, /test-gen, /debug-deep, /pr-review, /refactor)
- Rust assembler (single binary, ~500 KB)
- 3 hooks (auto-reassemble, pre-commit validate, no-hand-edit)
- install.sh (idempotent, cargo-builds on first run)
- MIT LICENSE

All 6 sanity greps pass: 0 Russian text, 0 specific project names,
0 incident numbers, 0 user paths, 0 hardcoded IPs, 0 API keys.

cargo check + assemble --validate: both pass on 14 manifests.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-20 23:58:34 +08:00

1.4 KiB

STACK — Go server

Use when the project is Go-locked (existing codebase) or the domain fits — networking daemons, agents, cloud-native tooling.

Modules: go.mod + go.sum committed. Go ≥ 1.22 (range-over-func, better slices/maps stdlib).

HTTP: prefer net/http stdlib + http.ServeMux (Go 1.22 pattern matching routes). Add a framework (chi, echo) only when the feature gap is concrete and documented — not "for ergonomics".

Context propagation (non-negotiable):

  • Every handler, DB call, outbound request takes ctx context.Context as FIRST arg.
  • ctx threads through stack without interruption — no context.Background() mid-call except at the edge.
  • context.WithTimeout on every external I/O.

Errors:

  • Return error; sentinels via errors.Is, typed via errors.As. NEVER strings.Contains(err.Error(), "...") — string match breaks on wrapping.
  • Wrap with %w: fmt.Errorf("ctx: %w", err).

Concurrency:

  • go vet + go test -race MANDATORY in CI.
  • Channels for ownership transfer, mutexes for protecting state — not both on the same data.
  • Goroutines started in handlers must have a clear lifecycle (parent ctx cancellation).

Logging: log/slog (structured). NO fmt.Println in prod paths.

Forbidden: string-match on error messages; goroutine leaks (no ctx cancellation path); init() doing I/O; go test without -race; panic() as control flow in library code.