100 lines
3.1 KiB
Go
100 lines
3.1 KiB
Go
// Copyright 2020 astaxie
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package metric
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import (
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"net/http"
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"reflect"
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"strconv"
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"strings"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/astaxie/beego"
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"github.com/astaxie/beego/logs"
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)
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func PrometheusMiddleWare(next http.Handler) http.Handler {
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summaryVec := prometheus.NewSummaryVec(prometheus.SummaryOpts{
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Name: "beego",
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Subsystem: "http_request",
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ConstLabels: map[string]string{
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"server": beego.BConfig.ServerName,
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"env": beego.BConfig.RunMode,
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"appname": beego.BConfig.AppName,
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},
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Help: "The statics info for http request",
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}, []string{"pattern", "method", "status", "duration"})
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prometheus.MustRegister(summaryVec)
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registerBuildInfo()
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return http.HandlerFunc(func(writer http.ResponseWriter, q *http.Request) {
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start := time.Now()
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next.ServeHTTP(writer, q)
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end := time.Now()
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go report(end.Sub(start), writer, q, summaryVec)
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})
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}
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func registerBuildInfo() {
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buildInfo := prometheus.NewGaugeVec(prometheus.GaugeOpts{
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Name: "beego",
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Subsystem: "build_info",
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Help: "The building information",
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ConstLabels: map[string]string{
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"appname": beego.BConfig.AppName,
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"build_version": beego.BuildVersion,
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"build_revision": beego.BuildGitRevision,
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"build_status": beego.BuildStatus,
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"build_tag": beego.BuildTag,
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"build_time": strings.Replace(beego.BuildTime, "--", " ", 1),
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"go_version": beego.GoVersion,
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"git_branch": beego.GitBranch,
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"start_time": time.Now().Format("2006-01-02 15:04:05"),
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},
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}, []string{})
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prometheus.MustRegister(buildInfo)
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buildInfo.WithLabelValues().Set(1)
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}
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func report(dur time.Duration, writer http.ResponseWriter, q *http.Request, vec *prometheus.SummaryVec) {
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ctrl := beego.BeeApp.Handlers
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ctx := ctrl.GetContext()
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ctx.Reset(writer, q)
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defer ctrl.GiveBackContext(ctx)
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// We cannot read the status code from q.Response.StatusCode
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// since the http server does not set q.Response. So q.Response is nil
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// Thus, we use reflection to read the status from writer whose concrete type is http.response
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responseVal := reflect.ValueOf(writer).Elem()
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field := responseVal.FieldByName("status")
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status := -1
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if field.IsValid() && field.Kind() == reflect.Int {
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status = int(field.Int())
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}
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ptn := "UNKNOWN"
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if rt, found := ctrl.FindRouter(ctx); found {
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ptn = rt.GetPattern()
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} else {
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logs.Warn("we can not find the router info for this request, so request will be recorded as UNKNOWN: " + q.URL.String())
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}
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ms := dur / time.Millisecond
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vec.WithLabelValues(ptn, q.Method, strconv.Itoa(status), strconv.Itoa(int(ms))).Observe(float64(ms))
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}
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