update prometheus dependencies (#5520)

Signed-off-by: junot <junotxiang@kubesphere.io>

vendor/github.com/metalmatze/signal/server/signalhttp/instrumentation.go

@@ -0,0 +1,96 @@
+// 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,
+				),
+			),
+		),
+	)
+}