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instrumented_client.go
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instrumented_client.go
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// Copyright 2022-2024 The Parca Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package http
import (
"net/http"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
type metrics struct {
inFlightGauge prometheus.Gauge
requestTotalCount *prometheus.CounterVec
dnsLatencyHistogram *prometheus.HistogramVec
tlsLatencyHistogram *prometheus.HistogramVec
requestDurationHistogram *prometheus.HistogramVec
}
func newMetrics(reg prometheus.Registerer) *metrics {
m := &metrics{
inFlightGauge: promauto.With(reg).NewGauge(prometheus.GaugeOpts{
Name: "http_client_in_flight_requests",
Help: "A gauge of in-flight requests.",
}),
requestTotalCount: promauto.With(reg).NewCounterVec(prometheus.CounterOpts{
Name: "http_client_request_total",
Help: "Total http client request by code and method.",
}, []string{"code", "method"}),
dnsLatencyHistogram: promauto.With(reg).NewHistogramVec(
prometheus.HistogramOpts{
Name: "http_client_dns_duration_seconds",
Help: "Track dns latency histogram.",
NativeHistogramBucketFactor: 1.1,
},
[]string{"event"},
),
tlsLatencyHistogram: promauto.With(reg).NewHistogramVec(
prometheus.HistogramOpts{
Name: "http_client_tls_duration_seconds",
Help: "Track TLS latency histogram.",
NativeHistogramBucketFactor: 1.1,
},
[]string{"event"},
),
requestDurationHistogram: promauto.With(reg).NewHistogramVec(
prometheus.HistogramOpts{
Name: "http_client_request_duration_seconds",
Help: "A histogram of request latencies.",
NativeHistogramBucketFactor: 1.1,
},
[]string{"code", "method"},
),
}
return m
}
func instrumentedRoundTripper(tripper http.RoundTripper, m *metrics) http.RoundTripper {
if m == nil {
return tripper
}
trace := &promhttp.InstrumentTrace{
DNSStart: func(t float64) {
m.dnsLatencyHistogram.WithLabelValues("dns_start").Observe(t)
},
DNSDone: func(t float64) {
m.dnsLatencyHistogram.WithLabelValues("dns_done").Observe(t)
},
TLSHandshakeStart: func(t float64) {
m.tlsLatencyHistogram.WithLabelValues("tls_handshake_start").Observe(t)
},
TLSHandshakeDone: func(t float64) {
m.tlsLatencyHistogram.WithLabelValues("tls_handshake_done").Observe(t)
},
}
return promhttp.InstrumentRoundTripperInFlight(
m.inFlightGauge,
promhttp.InstrumentRoundTripperCounter(
m.requestTotalCount,
promhttp.InstrumentRoundTripperTrace(
trace,
promhttp.InstrumentRoundTripperDuration(
m.requestDurationHistogram,
tripper,
),
),
),
)
}
func NewClient(reg prometheus.Registerer, tripper ...http.RoundTripper) *http.Client {
if tripper != nil {
return &http.Client{
Transport: instrumentedRoundTripper(tripper[0], newMetrics(reg)),
}
}
return &http.Client{
Transport: instrumentedRoundTripper(http.DefaultTransport, newMetrics(reg)),
}
}