95 lines
3.3 KiB
Go
95 lines
3.3 KiB
Go
// Copyright 2020 Trey Dockendorf
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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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"os"
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"strings"
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"github.com/alecthomas/kingpin/v2"
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"github.com/containerd/cgroups"
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"github.com/go-kit/log"
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"github.com/go-kit/log/level"
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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/promlog"
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"github.com/prometheus/common/promlog/flag"
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"github.com/prometheus/common/version"
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"github.com/treydock/cgroup_exporter/collector"
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)
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var (
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configPaths = kingpin.Flag("config.paths", "Comma separated list of cgroup paths to check, eg /user.slice,/system.slice,/slurm").Required().String()
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listenAddress = kingpin.Flag("web.listen-address", "Address to listen on for web interface and telemetry.").Default(":9306").String()
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disableExporterMetrics = kingpin.Flag("web.disable-exporter-metrics", "Exclude metrics about the exporter (promhttp_*, process_*, go_*)").Default("false").Bool()
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)
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func metricsHandler(logger log.Logger) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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registry := prometheus.NewRegistry()
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paths := strings.Split(*configPaths, ",")
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var cgroupV2 bool
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if cgroups.Mode() == cgroups.Unified {
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cgroupV2 = true
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}
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cgroupCollector := collector.NewCgroupCollector(cgroupV2, paths, logger)
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registry.MustRegister(cgroupCollector)
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registry.MustRegister(version.NewCollector(fmt.Sprintf("%s_exporter", collector.Namespace)))
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gatherers := prometheus.Gatherers{registry}
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if !*disableExporterMetrics {
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gatherers = append(gatherers, prometheus.DefaultGatherer)
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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.HandlerFor(gatherers, promhttp.HandlerOpts{})
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h.ServeHTTP(w, r)
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}
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}
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func main() {
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metricsEndpoint := "/metrics"
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promlogConfig := &promlog.Config{}
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flag.AddFlags(kingpin.CommandLine, promlogConfig)
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kingpin.Version(version.Print("cgroup_exporter"))
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kingpin.HelpFlag.Short('h')
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kingpin.Parse()
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logger := promlog.New(promlogConfig)
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level.Info(logger).Log("msg", "Starting cgroup_exporter", "version", version.Info())
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level.Info(logger).Log("msg", "Build context", "build_context", version.BuildContext())
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level.Info(logger).Log("msg", "Starting Server", "address", *listenAddress)
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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//nolint:errcheck
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w.Write([]byte(`<html>
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<head><title>cgroup Exporter</title></head>
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<body>
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<h1>cgroup Exporter</h1>
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<p><a href='` + metricsEndpoint + `'>Metrics</a></p>
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</body>
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</html>`))
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})
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http.Handle(metricsEndpoint, metricsHandler(logger))
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err := http.ListenAndServe(*listenAddress, nil)
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if err != nil {
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level.Error(logger).Log("err", err)
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os.Exit(1)
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}
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}
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