mirror of https://github.com/coder/coder.git
101 lines
2.8 KiB
Go
101 lines
2.8 KiB
Go
package httpmw
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import (
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"net/http"
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"strconv"
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"time"
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"github.com/go-chi/chi/v5"
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"github.com/coder/coder/v2/coderd/httpapi"
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"github.com/coder/coder/v2/coderd/tracing"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promauto"
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)
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func Prometheus(register prometheus.Registerer) func(http.Handler) http.Handler {
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factory := promauto.With(register)
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requestsProcessed := factory.NewCounterVec(prometheus.CounterOpts{
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Namespace: "coderd",
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Subsystem: "api",
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Name: "requests_processed_total",
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Help: "The total number of processed API requests",
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}, []string{"code", "method", "path"})
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requestsConcurrent := factory.NewGauge(prometheus.GaugeOpts{
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Namespace: "coderd",
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Subsystem: "api",
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Name: "concurrent_requests",
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Help: "The number of concurrent API requests.",
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})
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websocketsConcurrent := factory.NewGauge(prometheus.GaugeOpts{
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Namespace: "coderd",
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Subsystem: "api",
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Name: "concurrent_websockets",
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Help: "The total number of concurrent API websockets.",
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})
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websocketsDist := factory.NewHistogramVec(prometheus.HistogramOpts{
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Namespace: "coderd",
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Subsystem: "api",
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Name: "websocket_durations_seconds",
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Help: "Websocket duration distribution of requests in seconds.",
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Buckets: []float64{
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0.001, // 1ms
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1,
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60, // 1 minute
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60 * 60, // 1 hour
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60 * 60 * 15, // 15 hours
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60 * 60 * 30, // 30 hours
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},
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}, []string{"path"})
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requestsDist := factory.NewHistogramVec(prometheus.HistogramOpts{
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Namespace: "coderd",
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Subsystem: "api",
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Name: "request_latencies_seconds",
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Help: "Latency distribution of requests in seconds.",
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Buckets: []float64{0.001, 0.005, 0.010, 0.025, 0.050, 0.100, 0.500, 1, 5, 10, 30},
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}, []string{"method", "path"})
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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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var (
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start = time.Now()
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method = r.Method
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rctx = chi.RouteContext(r.Context())
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)
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sw, ok := w.(*tracing.StatusWriter)
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if !ok {
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panic("dev error: http.ResponseWriter is not *tracing.StatusWriter")
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}
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var (
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dist *prometheus.HistogramVec
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distOpts []string
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)
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// We want to count WebSockets separately.
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if httpapi.IsWebsocketUpgrade(r) {
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websocketsConcurrent.Inc()
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defer websocketsConcurrent.Dec()
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dist = websocketsDist
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} else {
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requestsConcurrent.Inc()
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defer requestsConcurrent.Dec()
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dist = requestsDist
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distOpts = []string{method}
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}
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next.ServeHTTP(w, r)
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path := rctx.RoutePattern()
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distOpts = append(distOpts, path)
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statusStr := strconv.Itoa(sw.Status)
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requestsProcessed.WithLabelValues(statusStr, method, path).Inc()
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dist.WithLabelValues(distOpts...).Observe(time.Since(start).Seconds())
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})
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}
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}
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