97 lines
2.9 KiB
Go
97 lines
2.9 KiB
Go
// Copyright 2021 by the contributors.
|
|
//
|
|
// 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 signalhttp
|
|
|
|
import (
|
|
"net/http"
|
|
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"github.com/prometheus/client_golang/prometheus/promhttp"
|
|
)
|
|
|
|
type instrumentationMiddleware struct {
|
|
requestCounter *prometheus.CounterVec
|
|
requestSize *prometheus.SummaryVec
|
|
requestDuration *prometheus.HistogramVec
|
|
responseSize *prometheus.HistogramVec
|
|
}
|
|
|
|
// HandlerInstrumenter can instrument handlers.
|
|
type HandlerInstrumenter interface {
|
|
NewHandler(labels prometheus.Labels, handler http.Handler) http.HandlerFunc
|
|
}
|
|
|
|
// NewHandlerInstrumenter creates a new middleware that observes some metrics for HTTP handlers.
|
|
func NewHandlerInstrumenter(r prometheus.Registerer, extraLabels []string) HandlerInstrumenter {
|
|
labels := append([]string{"code", "method"}, extraLabels...)
|
|
|
|
ins := &instrumentationMiddleware{
|
|
requestCounter: prometheus.NewCounterVec(
|
|
prometheus.CounterOpts{
|
|
Name: "http_requests_total",
|
|
Help: "Counter of HTTP requests.",
|
|
},
|
|
labels,
|
|
),
|
|
requestSize: prometheus.NewSummaryVec(
|
|
prometheus.SummaryOpts{
|
|
Name: "http_request_size_bytes",
|
|
Help: "Size of HTTP requests.",
|
|
},
|
|
labels,
|
|
),
|
|
requestDuration: prometheus.NewHistogramVec(
|
|
prometheus.HistogramOpts{
|
|
Name: "http_request_duration_seconds",
|
|
Help: "Histogram of latencies for HTTP requests.",
|
|
Buckets: []float64{.1, .2, .4, 1, 2.5, 5, 8, 20, 60, 120},
|
|
},
|
|
labels,
|
|
),
|
|
responseSize: prometheus.NewHistogramVec(
|
|
prometheus.HistogramOpts{
|
|
Name: "http_response_size_bytes",
|
|
Help: "Histogram of response size for HTTP requests.",
|
|
Buckets: prometheus.ExponentialBuckets(100, 10, 8),
|
|
},
|
|
labels,
|
|
),
|
|
}
|
|
|
|
if r != nil {
|
|
r.MustRegister(
|
|
ins.requestCounter,
|
|
ins.requestSize,
|
|
ins.requestDuration,
|
|
ins.responseSize,
|
|
)
|
|
}
|
|
|
|
return ins
|
|
}
|
|
|
|
// NewHandler wraps a HTTP handler with some metrics for HTTP handlers.
|
|
func (ins *instrumentationMiddleware) NewHandler(labels prometheus.Labels, handler http.Handler) http.HandlerFunc {
|
|
return promhttp.InstrumentHandlerCounter(ins.requestCounter.MustCurryWith(labels),
|
|
promhttp.InstrumentHandlerRequestSize(ins.requestSize.MustCurryWith(labels),
|
|
promhttp.InstrumentHandlerDuration(ins.requestDuration.MustCurryWith(labels),
|
|
promhttp.InstrumentHandlerResponseSize(ins.responseSize.MustCurryWith(labels),
|
|
handler,
|
|
),
|
|
),
|
|
),
|
|
)
|
|
}
|