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web/httputil/handler_func.go

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feat(web): initial implementation — server, mw, httputil, health (v1.0.0) Introduces code.nochebuena.dev/einherjar/web — the HTTP transport layer of the Einherjar framework. Absorbs httpserver, httpmw, and httputil from micro-lib, replacing gorilla/mux with chi, adopting SecurityBag-native middleware, and centralizing error handling through a single httputil.Error function. server: - Server interface — embeds lifecycle.Component and chi.Router - Config struct (EINHERJAR_SERVER_* env vars); DefaultConfig - New(logger, cfg, opts...) Server; WithMiddleware option - Binds TCP synchronously in OnStart; logs "server: listening" on success - Graceful shutdown within ShutdownTimeout on OnStop mw: - Recover — catches panics, returns 500, logs at Error - RequestID — injects UUID v7 (UUID v4 fallback) into context and X-Request-ID header - RequestLogger — structured access log per request - CORS / CORSAllowAll — chi-based, applied only when origins non-empty - IPRateLimit / UserRateLimit — pluggable RateLimiterStore interface - InMemoryRateLimiterStore — token-bucket backed by golang.org/x/time/rate; background goroutine evicts stale entries every 5 minutes - StatusRecorder — wraps ResponseWriter to capture HTTP status code httputil: - Handle[Req, Res] / HandleNoBody[Res] / HandleEmpty[Req] — generic handler adapters - Error(logger, w, r, err) — derives log level from status (≥500→Error, 4xx→Warn, 499→Info); writes standardized JSON body; logz enriches *xerrors.Err automatically - JSON(w, status, v) / NoContent(w) — response helpers - HandlerFunc adapter type health: - NewHandler / NewHandlerWithConfig — runs all Checkable checks concurrently; returns JSON {status, components} with per-component latency and error - Config struct (EINHERJAR_HEALTH_CHECK_TIMEOUT, default 5s) Root factory: - web.New(logger, cfg...) Server — composes Recover+RequestID+RequestLogger+CORS in outermost-first order; CORS applied only when AllowedOrigins non-empty - server.Server interface and web/server/identifiable.go: embeds observability.Identifiable; ModulePath and ModuleVersion read via runtime/debug.ReadBuildInfo() — prints in launcher banner
2026-05-29 15:48:11 +00:00
package httputil
import "net/http"
var _ http.Handler = HandlerFunc(nil)
// HandlerFunc is an http.Handler that returns an error.
// On non-nil error the error is mapped to the appropriate HTTP response via [Error].
// Use for manual handlers that need path parameters or custom status codes.
type HandlerFunc func(w http.ResponseWriter, r *http.Request) error
// ServeHTTP implements http.Handler.
// Errors are written as standardized JSON without logging — no logger is in
// scope for a bare function type. Use [Handle], [HandleNoBody], or
// [HandleEmpty] for centralized logging, or call [Error] explicitly.
func (h HandlerFunc) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if err := h(w, r); err != nil {
writeError(w, err)
}
}