Sanket SudakeandGitHub
5fae765323
* Define client generator to generate all k8s clients * Increase QPS and burst values * Capture client-go metrics * Support for controller runtime metrics Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>
96 lines
2.6 KiB
Go
96 lines
2.6 KiB
Go
/*
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Copyright 2022 The Fission Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package metrics
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import (
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"fmt"
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"net/http"
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"github.com/gorilla/mux"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/fission/fission/pkg/router/util"
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)
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type ResponseWriterWrapper struct {
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http.ResponseWriter
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statusCode int
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}
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var (
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httpRequestsTotal = prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Name: "http_requests_total",
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Help: "Number of requests by path, method and status code.",
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},
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[]string{"path", "method", "code"},
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)
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httpRequestDuration = prometheus.NewSummaryVec(
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prometheus.SummaryOpts{
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Name: "http_requests_duration_seconds",
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Help: "Time taken to serve the request by path and method.",
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Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
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},
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[]string{"path", "method"},
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)
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httpRequestInFlight = prometheus.NewGaugeVec(
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prometheus.GaugeOpts{
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Name: "http_requests_in_flight",
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Help: "Number of requests currently being served by path and method.",
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},
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[]string{"path", "method"},
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)
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)
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func init() {
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Registry.MustRegister(httpRequestsTotal)
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Registry.MustRegister(httpRequestDuration)
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Registry.MustRegister(httpRequestInFlight)
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}
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func (rw *ResponseWriterWrapper) WriteHeader(statuscode int) {
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rw.statusCode = statuscode
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rw.ResponseWriter.WriteHeader(statuscode)
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}
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func HTTPMetricMiddleware(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if util.IsWebsocketRequest(r) {
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next.ServeHTTP(w, r)
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return
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}
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labels := make(prometheus.Labels, 0)
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labels["path"] = r.URL.Path
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if route := mux.CurrentRoute(r); route != nil {
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if routePath, err := route.GetPathTemplate(); err == nil {
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labels["path"] = routePath
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}
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}
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labels["method"] = r.Method
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rw := ResponseWriterWrapper{w, http.StatusOK}
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httpRequestInFlight.With(labels).Inc()
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httpRequestDuration := prometheus.NewTimer(httpRequestDuration.With(labels))
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defer func() {
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httpRequestDuration.ObserveDuration()
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httpRequestInFlight.With(labels).Dec()
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labels["code"] = fmt.Sprintf("%d", rw.statusCode)
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httpRequestsTotal.With(labels).Inc()
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}()
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next.ServeHTTP(&rw, r)
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})
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}
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