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// Copyright 2015 The Prometheus 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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//
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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 main
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import (
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"fmt"
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"net/http"
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_ "net/http/pprof"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/prometheus/common/log"
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"github.com/prometheus/common/version"
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"github.com/prometheus/node_exporter/collector"
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"gopkg.in/alecthomas/kingpin.v2"
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)
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func init() {
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prometheus.MustRegister(version.NewCollector("node_exporter"))
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}
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func handler(w http.ResponseWriter, r *http.Request) {
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filters := r.URL.Query()["collect[]"]
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log.Debugln("collect query:", filters)
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nc, err := collector.NewNodeCollector(filters...)
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if err != nil {
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log.Warnln("Couldn't create", err)
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w.WriteHeader(http.StatusBadRequest)
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w.Write([]byte(fmt.Sprintf("Couldn't create %s", err)))
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return
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}
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registry := prometheus.NewRegistry()
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err = registry.Register(nc)
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if err != nil {
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log.Errorln("Couldn't register collector:", err)
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w.WriteHeader(http.StatusInternalServerError)
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w.Write([]byte(fmt.Sprintf("Couldn't register collector: %s", err)))
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return
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}
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gatherers := prometheus.Gatherers{
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prometheus.DefaultGatherer,
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registry,
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}
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// Delegate http serving to Prometheus client library, which will call collector.Collect.
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h := promhttp.InstrumentMetricHandler(
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registry,
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promhttp.HandlerFor(gatherers,
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promhttp.HandlerOpts{
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ErrorLog: log.NewErrorLogger(),
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ErrorHandling: promhttp.ContinueOnError,
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}),
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)
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h.ServeHTTP(w, r)
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}
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func main() {
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var (
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listenAddress = kingpin.Flag("web.listen-address", "Address on which to expose metrics and web interface.").Default(":9100").String()
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metricsPath = kingpin.Flag("web.telemetry-path", "Path under which to expose metrics.").Default("/metrics").String()
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)
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log.AddFlags(kingpin.CommandLine)
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kingpin.Version(version.Print("node_exporter"))
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kingpin.HelpFlag.Short('h')
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kingpin.Parse()
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log.Infoln("Starting node_exporter", version.Info())
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log.Infoln("Build context", version.BuildContext())
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// This instance is only used to check collector creation and logging.
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nc, err := collector.NewNodeCollector()
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if err != nil {
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log.Fatalf("Couldn't create collector: %s", err)
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}
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log.Infof("Enabled collectors:")
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for n := range nc.Collectors {
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log.Infof(" - %s", n)
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}
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http.HandleFunc(*metricsPath, handler)
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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w.Write([]byte(`<html>
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<head><title>Node Exporter</title></head>
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<body>
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<h1>Node Exporter</h1>
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<p><a href="` + *metricsPath + `">Metrics</a></p>
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</body>
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</html>`))
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})
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log.Infoln("Listening on", *listenAddress)
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err = http.ListenAndServe(*listenAddress, nil)
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if err != nil {
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log.Fatal(err)
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}
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}
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