Maksim Totmin
7b152c7fb3
- domain: address normalization/parsing, matching with explicit statuses - adapters: SQLite registry store, ArcGIS outages client, optional LLM rewriter, HTTP API - seed pipeline with duplicate handling and unparsed reporting - CLI (seed/verify/resolve), systemd unit, OpenAPI contract, tests
102 lines
2.7 KiB
Go
102 lines
2.7 KiB
Go
package httpapi
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import (
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"context"
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"crypto/rand"
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"encoding/hex"
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"log/slog"
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"net/http"
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"time"
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)
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type ctxKey int
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const requestIDKey ctxKey = 0
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// requestIDMW assigns a request id (for correlation in logs) and echoes it.
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func requestIDMW(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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id := r.Header.Get("X-Request-Id")
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if id == "" {
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id = newRequestID()
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}
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w.Header().Set("X-Request-Id", id)
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ctx := context.WithValue(r.Context(), requestIDKey, id)
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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// loggingMW logs one line per request with method, path, status and duration.
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// It records no addresses (PII) — only routing metadata.
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func loggingMW(log *slog.Logger) func(http.Handler) http.Handler {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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start := time.Now()
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rec := &statusRecorder{ResponseWriter: w, status: http.StatusOK}
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next.ServeHTTP(rec, r)
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log.Info("http",
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"method", r.Method,
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"path", r.URL.Path,
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"status", rec.status,
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"duration_ms", time.Since(start).Milliseconds(),
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"request_id", requestIDFrom(r.Context()),
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)
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})
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}
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}
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// timeoutMW bounds the whole request, so a slow portal cannot tie up a
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// goroutine indefinitely.
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func timeoutMW(d time.Duration) func(http.Handler) http.Handler {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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ctx, cancel := context.WithTimeout(r.Context(), d)
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defer cancel()
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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}
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// recoverMW turns a panic into a 500 instead of crashing the process.
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func recoverMW(log *slog.Logger) func(http.Handler) http.Handler {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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defer func() {
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if rec := recover(); rec != nil {
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log.Error("panic", "value", rec, "request_id", requestIDFrom(r.Context()))
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writeError(w, http.StatusInternalServerError, "internal error")
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}
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}()
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next.ServeHTTP(w, r)
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})
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}
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}
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func requestIDFrom(ctx context.Context) string {
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if v, ok := ctx.Value(requestIDKey).(string); ok {
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return v
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}
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return ""
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}
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type statusRecorder struct {
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http.ResponseWriter
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status int
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}
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func (s *statusRecorder) WriteHeader(code int) {
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s.status = code
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s.ResponseWriter.WriteHeader(code)
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}
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// newRequestID returns a short random hex id. crypto/rand never fails in
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// practice; on the off chance it does we fall back to a constant so the
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// request still completes.
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func newRequestID() string {
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var b [16]byte
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if _, err := rand.Read(b[:]); err != nil {
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return "unknown"
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}
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return hex.EncodeToString(b[:])
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}
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