forked from mirrors/statsd_exporter
277 lines
9 KiB
Go
277 lines
9 KiB
Go
// Copyright 2013 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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"bufio"
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"net"
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"net/http"
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_ "net/http/pprof"
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"os"
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"os/signal"
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"strconv"
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"syscall"
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"github.com/howeyc/fsnotify"
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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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"gopkg.in/alecthomas/kingpin.v2"
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"github.com/prometheus/statsd_exporter/pkg/mapper"
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)
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func init() {
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prometheus.MustRegister(version.NewCollector("statsd_exporter"))
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}
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func serveHTTP(listenAddress, metricsEndpoint string) {
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http.Handle(metricsEndpoint, promhttp.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>StatsD Exporter</title></head>
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<body>
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<h1>StatsD 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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log.Fatal(http.ListenAndServe(listenAddress, nil))
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}
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func ipPortFromString(addr string) (*net.IPAddr, int) {
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host, portStr, err := net.SplitHostPort(addr)
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if err != nil {
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log.Fatal("Bad StatsD listening address", addr)
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}
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if host == "" {
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host = "0.0.0.0"
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}
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ip, err := net.ResolveIPAddr("ip", host)
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if err != nil {
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log.Fatalf("Unable to resolve %s: %s", host, err)
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}
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port, err := strconv.Atoi(portStr)
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if err != nil || port < 0 || port > 65535 {
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log.Fatalf("Bad port %s: %s", portStr, err)
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}
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return ip, port
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}
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func udpAddrFromString(addr string) *net.UDPAddr {
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ip, port := ipPortFromString(addr)
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return &net.UDPAddr{
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IP: ip.IP,
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Port: port,
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Zone: ip.Zone,
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}
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}
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func tcpAddrFromString(addr string) *net.TCPAddr {
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ip, port := ipPortFromString(addr)
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return &net.TCPAddr{
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IP: ip.IP,
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Port: port,
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Zone: ip.Zone,
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}
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}
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func watchConfig(fileName string, mapper *mapper.MetricMapper, cacheSize int) {
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watcher, err := fsnotify.NewWatcher()
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if err != nil {
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log.Fatal(err)
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}
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err = watcher.WatchFlags(fileName, fsnotify.FSN_MODIFY)
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if err != nil {
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log.Fatal(err)
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}
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for {
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select {
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case ev := <-watcher.Event:
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log.Infof("Config file changed (%s), attempting reload", ev)
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err = mapper.InitFromFile(fileName, cacheSize)
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if err != nil {
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log.Errorln("Error reloading config:", err)
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configLoads.WithLabelValues("failure").Inc()
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} else {
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log.Infoln("Config reloaded successfully")
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configLoads.WithLabelValues("success").Inc()
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}
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// Re-add the file watcher since it can get lost on some changes. E.g.
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// saving a file with vim results in a RENAME-MODIFY-DELETE event
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// sequence, after which the newly written file is no longer watched.
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_ = watcher.WatchFlags(fileName, fsnotify.FSN_MODIFY)
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case err := <-watcher.Error:
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log.Errorln("Error watching config:", err)
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}
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}
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}
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func dumpFSM(mapper *mapper.MetricMapper, dumpFilename string) error {
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f, err := os.Create(dumpFilename)
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if err != nil {
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return err
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}
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log.Infoln("Start dumping FSM to", dumpFilename)
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w := bufio.NewWriter(f)
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mapper.FSM.DumpFSM(w)
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w.Flush()
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f.Close()
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log.Infoln("Finish dumping FSM")
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return nil
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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", "The address on which to expose the web interface and generated Prometheus metrics.").Default(":9102").String()
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metricsEndpoint = kingpin.Flag("web.telemetry-path", "Path under which to expose metrics.").Default("/metrics").String()
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statsdListenUDP = kingpin.Flag("statsd.listen-udp", "The UDP address on which to receive statsd metric lines. \"\" disables it.").Default(":9125").String()
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statsdListenTCP = kingpin.Flag("statsd.listen-tcp", "The TCP address on which to receive statsd metric lines. \"\" disables it.").Default(":9125").String()
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statsdListenUnixgram = kingpin.Flag("statsd.listen-unixgram", "The Unixgram socket path to receive statsd metric lines in datagram. \"\" disables it.").Default("").String()
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// not using Int here because flag diplays default in decimal, 0755 will show as 493
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statsdUnixSocketMode = kingpin.Flag("statsd.unixsocket-mode", "The permission mode of the unix socket.").Default("755").String()
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mappingConfig = kingpin.Flag("statsd.mapping-config", "Metric mapping configuration file name.").String()
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readBuffer = kingpin.Flag("statsd.read-buffer", "Size (in bytes) of the operating system's transmit read buffer associated with the UDP or Unixgram connection. Please make sure the kernel parameters net.core.rmem_max is set to a value greater than the value specified.").Int()
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cacheSize = kingpin.Flag("statsd.cache-size", "Maximum size of your metric mapping cache. Relies on least recently used replacement policy if max size is reached.").Default("1000").Int()
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eventQueueSize = kingpin.Flag("statsd.event-queue-size", "Size of internal queue for processing events").Default("10000").Int()
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eventFlushThreshold = kingpin.Flag("statsd.event-flush-threshold", "Number of events to hold in queue before flushing").Default("1000").Int()
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eventFlushInterval = kingpin.Flag("statsd.event-flush-interval", "Number of events to hold in queue before flushing").Default("200ms").Duration()
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dumpFSMPath = kingpin.Flag("debug.dump-fsm", "The path to dump internal FSM generated for glob matching as Dot file.").Default("").String()
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)
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log.AddFlags(kingpin.CommandLine)
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kingpin.Version(version.Print("statsd_exporter"))
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kingpin.HelpFlag.Short('h')
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kingpin.Parse()
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if *statsdListenUDP == "" && *statsdListenTCP == "" && *statsdListenUnixgram == "" {
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log.Fatalln("At least one of UDP/TCP/Unixgram listeners must be specified.")
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}
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log.Infoln("Starting StatsD -> Prometheus Exporter", version.Info())
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log.Infoln("Build context", version.BuildContext())
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log.Infof("Accepting StatsD Traffic: UDP %v, TCP %v, Unixgram %v", *statsdListenUDP, *statsdListenTCP, *statsdListenUnixgram)
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log.Infoln("Accepting Prometheus Requests on", *listenAddress)
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go serveHTTP(*listenAddress, *metricsEndpoint)
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events := make(chan Events, *eventQueueSize)
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defer close(events)
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eventQueue := newEventQueue(events, *eventFlushThreshold, *eventFlushInterval)
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if *statsdListenUDP != "" {
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udpListenAddr := udpAddrFromString(*statsdListenUDP)
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uconn, err := net.ListenUDP("udp", udpListenAddr)
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if err != nil {
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log.Fatal(err)
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}
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if *readBuffer != 0 {
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err = uconn.SetReadBuffer(*readBuffer)
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if err != nil {
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log.Fatal("Error setting UDP read buffer:", err)
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}
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}
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ul := &StatsDUDPListener{conn: uconn, eventHandler: eventQueue}
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go ul.Listen()
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}
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if *statsdListenTCP != "" {
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tcpListenAddr := tcpAddrFromString(*statsdListenTCP)
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tconn, err := net.ListenTCP("tcp", tcpListenAddr)
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if err != nil {
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log.Fatal(err)
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}
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defer tconn.Close()
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tl := &StatsDTCPListener{conn: tconn, eventHandler: eventQueue}
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go tl.Listen()
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}
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if *statsdListenUnixgram != "" {
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var err error
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if _, err = os.Stat(*statsdListenUnixgram); !os.IsNotExist(err) {
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log.Fatalf("Unixgram socket \"%s\" already exists", *statsdListenUnixgram)
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}
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uxgconn, err := net.ListenUnixgram("unixgram", &net.UnixAddr{
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Net: "unixgram",
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Name: *statsdListenUnixgram,
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})
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if err != nil {
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log.Fatal(err)
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}
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defer uxgconn.Close()
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if *readBuffer != 0 {
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err = uxgconn.SetReadBuffer(*readBuffer)
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if err != nil {
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log.Fatal("Error setting Unixgram read buffer:", err)
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}
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}
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ul := &StatsDUnixgramListener{conn: uxgconn}
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go ul.Listen()
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// if it's an abstract unix domain socket, it won't exist on fs
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// so we can't chmod it either
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if _, err := os.Stat(*statsdListenUnixgram); !os.IsNotExist(err) {
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defer os.Remove(*statsdListenUnixgram)
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// convert the string to octet
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perm, err := strconv.ParseInt("0"+string(*statsdUnixSocketMode), 8, 32)
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if err != nil {
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log.Warnf("Bad permission %s: %v, ignoring\n", *statsdUnixSocketMode, err)
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} else {
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err = os.Chmod(*statsdListenUnixgram, os.FileMode(perm))
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if err != nil {
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log.Warnf("Failed to change unixgram socket permission: %v", err)
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}
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}
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}
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}
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mapper := &mapper.MetricMapper{MappingsCount: mappingsCount}
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if *mappingConfig != "" {
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err := mapper.InitFromFile(*mappingConfig, *cacheSize)
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if err != nil {
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log.Fatal("Error loading config:", err)
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}
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if *dumpFSMPath != "" {
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err := dumpFSM(mapper, *dumpFSMPath)
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if err != nil {
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log.Fatal("Error dumping FSM:", err)
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}
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}
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go watchConfig(*mappingConfig, mapper, *cacheSize)
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} else {
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mapper.InitCache(*cacheSize)
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}
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exporter := NewExporter(mapper)
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signals := make(chan os.Signal, 1)
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signal.Notify(signals, os.Interrupt, syscall.SIGTERM)
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go exporter.Listen(events)
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<-signals
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}
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