Gabriel Radureau
91d50e60ee
Implements Phase 1 part 2 of ADR-0022 (Rate Limiting and Cache Strategy): in-memory cache service using github.com/patrickmn/go-cache. Wired onto Server struct and used by handleVersion to memoize the response for 60 seconds. Companion to PR #22 (per-IP rate limit middleware). Changes: - New: pkg/cache/cache.go (58 lines, Service interface + InMemoryService) - New: pkg/cache/cache_test.go (125 lines, 6 unit tests, all passing) - Modified: pkg/config/config.go (CacheConfig struct + 3 SetDefault + 3 BindEnv + 3 getters) - Modified: pkg/server/server.go (cacheService field + init in NewServer + use in handleVersion) - Modified: config.yaml (cache section with defaults) - go.mod / go.sum (github.com/patrickmn/go-cache v2.1.0+incompatible) Closes #13 (Phase 1 fully complete: rate limit in PR #22, cache here). Phase 2 (Redis-compatible shared cache via Dragonfly/KeyDB) deferred. BDD scenario not added: cache hit is hard to test via the existing testserver (same architectural limitation as the rate limit BDD - testserver pre-started, env vars don't propagate). Behavior is fully covered by unit tests (6/6 PASS). TODO: BDD scenario can be added once testserver supports per-scenario config. Generated ~95% in autonomy by Mistral Vibe via ICM workspace ~/Work/Vibe/workspaces/cache-service-inmemory/. T6 cost €2.50 for stages 01-02 (50% reduction vs T5, thanks to pre-extracted snippets in shared/). Trainer (Claude) finalized commit/PR (Mistral hit max-turns). 🤖 Co-Authored-By: Mistral Vibe (devstral-2 / mistral-medium-3.5) Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
dance-lessons-coach
Go web service demonstrating idiomatic package structure, versioned JSON API, and production-ready features.
Features
- Versioned JSON API (
/api/v1,/api/v2) - Chi router with graceful shutdown
- Zerolog structured logging (console and JSON modes)
- Viper configuration (file + env vars)
- Readiness endpoint for Kubernetes / service mesh
- OpenTelemetry / Jaeger distributed tracing
- OpenAPI / Swagger UI (embedded in binary)
- PostgreSQL user service with JWT auth
- BDD + unit tests
Quick Start
git clone https://gitea.arcodange.lab/arcodange/dance-lessons-coach.git
cd dance-lessons-coach
./scripts/build.sh # produces ./bin/server and ./bin/greet
./scripts/start-server.sh start
curl http://localhost:8080/api/health
curl http://localhost:8080/api/v1/greet/Alice
Stop: ./scripts/start-server.sh stop
Greet CLI
go run ./cmd/greet # Hello world!
go run ./cmd/greet Alice # Hello Alice!
Configuration
All options are available via config.yaml or DLC_* environment variables.
| Env var | Default | Description |
|---|---|---|
DLC_SERVER_PORT |
8080 |
Listening port |
DLC_SERVER_HOST |
0.0.0.0 |
Bind address |
DLC_LOGGING_JSON |
false |
JSON log format |
DLC_LOGGING_OUTPUT |
stderr | Log file path |
DLC_SHUTDOWN_TIMEOUT |
30s |
Graceful shutdown window |
DLC_API_V2_ENABLED |
false |
Enable /api/v2 routes |
DLC_CONFIG_FILE |
./config.yaml |
Override config path |
See config.example.yaml for a full template.
API
| Method | Path | Description |
|---|---|---|
| GET | /api/health |
Liveness check |
| GET | /api/ready |
Readiness check (503 during shutdown) |
| GET | /api/version |
Version info (?format=plain|full|json) |
| GET | /api/v1/greet/ |
Default greeting |
| GET | /api/v1/greet/{name} |
Named greeting |
| POST | /api/v2/greet |
V2 greeting with validation |
| GET | /swagger/ |
Swagger UI |
Testing
go test ./... # unit + integration tests
./scripts/test-graceful-shutdown.sh # lifecycle + JSON logging validation
./scripts/test-opentelemetry.sh # tracing end-to-end
Gitea Client
AI agent helper script at .vibe/skills/gitea-client/scripts/gitea-client.sh.
Auth setup:
echo "your_token" > ~/.gitea_token
chmod 600 ~/.gitea_token
export GITEA_API_TOKEN_FILE="$HOME/.gitea_token"
Get a token at https://gitea.arcodange.lab → Profile → Settings → Applications.
Architecture
Key decisions are documented in adr/. See AGENTS.md for the full development reference (commands, config, ADR index, commit conventions).
License
MIT