51 lines
1.2 KiB
Go
51 lines
1.2 KiB
Go
package server
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import (
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"log/slog"
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"net/http"
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"time"
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"g.fc.run/ai/byre/internal/trace"
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)
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const slowRequest = 200 * time.Millisecond
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type timedWriter struct {
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http.ResponseWriter
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start time.Time
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trace *trace.Trace
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status int
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}
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func (w *timedWriter) WriteHeader(status int) {
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if w.status == 0 {
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w.status = status
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w.Header().Set("Server-Timing", w.trace.Header(time.Since(w.start)))
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}
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w.ResponseWriter.WriteHeader(status)
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}
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func (w *timedWriter) Write(b []byte) (int, error) {
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if w.status == 0 {
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w.WriteHeader(http.StatusOK)
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}
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return w.ResponseWriter.Write(b)
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}
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func (w *timedWriter) Unwrap() http.ResponseWriter {
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return w.ResponseWriter
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}
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func timing(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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ctx, t := trace.New(r.Context())
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tw := &timedWriter{ResponseWriter: w, start: time.Now(), trace: t}
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next.ServeHTTP(tw, r.WithContext(ctx))
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took := time.Since(tw.start)
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if took < slowRequest || tw.status == http.StatusSwitchingProtocols || tw.Header().Get("Content-Type") == "text/event-stream" {
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return
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}
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slog.Info("request slow", "method", r.Method, "path", r.URL.Path, "status", tw.status, "took", took, "spans", t.String())
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})
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}
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