You've already forked agentic-coding-workflow
52 lines
1.8 KiB
Go
52 lines
1.8 KiB
Go
package middleware
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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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)
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// statusRecorder wraps http.ResponseWriter to capture the response status
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// code so the Logger middleware can include it in the structured log line.
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//
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// The default status is initialised to http.StatusOK because net/http
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// implicitly emits a 200 when a handler writes a body without calling
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// WriteHeader explicitly; mirroring that behaviour keeps logs accurate.
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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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// WriteHeader records the status code before delegating to the wrapped
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// ResponseWriter so the original response semantics are preserved.
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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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// Logger returns HTTP middleware that emits a single structured log line
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// per request once the downstream handler has finished. The line includes
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// method, path, response status, elapsed duration in milliseconds, and the
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// request ID (if RequestID middleware is mounted upstream).
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//
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// The middleware is intentionally placed *inside* RequestID so the
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// generated identifier is available via context; placing it outside would
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// log an empty request_id.
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func Logger(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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ctx := r.Context()
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log.LogAttrs(ctx, slog.LevelInfo, "http",
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slog.String("method", r.Method),
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slog.String("path", r.URL.Path),
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slog.Int("status", rec.status),
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slog.Int64("duration_ms", time.Since(start).Milliseconds()),
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slog.String("request_id", RequestIDFromContext(ctx)),
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)
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})
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}
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}
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