# Documentation Review Notes

## Consistency Check Results

### ✅ Consistent

- Configuration documented in `data_models.md` matches actual `config.go` struct
- Hub methods documented in `components.md` match actual implementation
- CLI flags documented in `interfaces.md` match `main.go`
- Build commands in `codebase_info.md` match `Makefile`

### ⚠️ Inconsistencies Found

| Issue | Location | Details |
|-------|----------|---------|
| **Port mismatch in example client** | `example/index.html` | Uses `ws://localhost:8000/` but config default is port `8443` |
| **Metrics type mismatch** | `internal/metrics/metrics.go` | `MessagesTotal`, `ConnectionsTotal`, `DisconnectionsTotal` are defined as `Gauge` but semantically represent counters (monotonically increasing values). Should be `Counter` type. |
| **Silent client removal** | `internal/hub/hub.go` | During broadcast, write errors cause client removal without going through the `unregister` channel, meaning `DisconnectionsTotal` and `ConnectedClients` metrics won't be updated correctly. |
| **README port reference** | `README.md` | Mentions TLS is enabled by default, but `config.yaml` has `tls.enabled: false` |

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## Completeness Check Results

### ✅ Well-Documented Areas

- Core WebSocket relay logic
- Configuration structure and loading
- Build and deployment pipeline
- Metrics definitions

### ❌ Documentation Gaps

| Gap | Severity | Recommendation |
|-----|----------|----------------|
| **No graceful shutdown** | Medium | Document that the server lacks graceful shutdown — connections are terminated abruptly on SIGTERM |
| **No rate limiting** | Medium | Document absence of rate limiting and implications for production use |
| **No message size limits** | Medium | No `ReadLimit` set on WebSocket connections — potential DoS vector |
| **No health check endpoint** | Low | No `/health` or `/ready` endpoint for orchestrators |
| **No connection limits** | Medium | No max client count — server could be overwhelmed |
| **No logging configuration** | Low | Uses default `log` package with no level control |
| **No deployment docs** | Medium | No systemd unit file, Docker instructions, or k8s manifests |
| **Missing test coverage** | Medium | `internal/metrics` has no tests; hub integration tests (actual WebSocket connections) missing |

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## Language Support

| Aspect | Support Level | Notes |
|--------|--------------|-------|
| Go source analysis | ✅ Full | All Go code fully analyzed |
| HTML/JS (example) | ✅ Full | Simple single-file client analyzed |
| YAML configs | ✅ Full | Configuration fully documented |
| Makefile | ✅ Full | All targets documented |
| Gitea Actions YAML | ✅ Full | CI/CD pipelines documented |

---

## Recommendations

### High Priority
1. **Fix metrics types**: Change `MessagesTotal`, `ConnectionsTotal`, `DisconnectionsTotal` from `Gauge` to `Counter`
2. **Fix broadcast disconnect handling**: Route write-error disconnections through the unregister channel to maintain accurate metrics
3. **Add message size limits**: Set `conn.SetReadLimit()` to prevent memory exhaustion

### Medium Priority
4. **Add graceful shutdown**: Use `context.Context` and `http.Server.Shutdown()`
5. **Add health endpoint**: Simple `/health` returning 200 OK
6. **Add integration tests**: Test actual WebSocket connections end-to-end
7. **Fix example port**: Update `example/index.html` to use port 8443

### Low Priority
8. **Add structured logging**: Replace `log` with `slog` or `zerolog`
9. **Add connection limits**: Max concurrent connections configuration
10. **Add Docker support**: Dockerfile and docker-compose for easy deployment