60 lines
1.2 KiB
Go
60 lines
1.2 KiB
Go
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package httpslog
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import (
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"fmt"
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"log/slog"
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"net/http"
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"time"
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"github.com/VictoriaMetrics/metrics"
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"go.xsfx.dev/glucose_exporter/httpslog/internal/mutil"
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)
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func Handler() func(next 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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lw := mutil.WrapWriter(w)
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defer func() {
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// Logging.
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slog.Info(
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"handled request",
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"status",
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lw.Status(),
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"bytes",
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lw.BytesWritten(),
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"duration",
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time.Since(start),
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"method",
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r.Method,
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"url",
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r.URL,
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"user-agent",
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r.UserAgent(),
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"proto",
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r.Proto,
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)
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// Metrics.
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labels := fmt.Sprintf(
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`method="%s",url="%s",status="%d"`,
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r.Method,
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r.URL,
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lw.Status(),
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)
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metrics.GetOrCreateCounter(fmt.Sprintf(`requests_total{%s}`, labels)).Inc()
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metrics.GetOrCreateSummary(
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fmt.Sprintf(`requests_duration_seconds{%s}`, labels),
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).UpdateDuration(start)
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metrics.GetOrCreateHistogram(
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fmt.Sprintf("response_size{%s}", labels),
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).Update(float64(lw.BytesWritten()))
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}()
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next.ServeHTTP(lw, r)
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})
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}
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}
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