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