mirror of
https://github.com/prometheus/statsd_exporter.git
synced 2024-05-28 14:08:10 +00:00
124c5b88d0
This allows the mapping logic and configuration format to be re-used by the graphite exporter. Enables prometheus/graphite_exporter#37, cf. https://github.com/prometheus/graphite_exporter/pull/52#issuecomment-412324849 Signed-off-by: Matthias Rampke <mr@soundcloud.com>
202 lines
5.9 KiB
Go
202 lines
5.9 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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"flag"
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"fmt"
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"net"
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"net/http"
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"os"
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"strconv"
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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/common/log"
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"github.com/prometheus/common/version"
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"github.com/prometheus/statsd_exporter/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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var (
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listenAddress = flag.String("web.listen-address", ":9102", "The address on which to expose the web interface and generated Prometheus metrics.")
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metricsEndpoint = flag.String("web.telemetry-path", "/metrics", "Path under which to expose metrics.")
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statsdListenAddress = flag.String("statsd.listen-address", "", "The UDP address on which to receive statsd metric lines. DEPRECATED, use statsd.listen-udp instead.")
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statsdListenUDP = flag.String("statsd.listen-udp", ":9125", "The UDP address on which to receive statsd metric lines. \"\" disables it.")
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statsdListenTCP = flag.String("statsd.listen-tcp", ":9125", "The TCP address on which to receive statsd metric lines. \"\" disables it.")
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mappingConfig = flag.String("statsd.mapping-config", "", "Metric mapping configuration file name.")
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readBuffer = flag.Int("statsd.read-buffer", 0, "Size (in bytes) of the operating system's transmit read buffer associated with the UDP connection. Please make sure the kernel parameters net.core.rmem_max is set to a value greater than the value specified.")
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showVersion = flag.Bool("version", false, "Print version information.")
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)
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func serveHTTP() {
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http.Handle(*metricsEndpoint, prometheus.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) {
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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)
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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 main() {
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flag.Parse()
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if *showVersion {
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fmt.Fprintln(os.Stdout, version.Print("statsd_exporter"))
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os.Exit(0)
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}
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if *statsdListenAddress != "" {
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log.Warnln("Warning: statsd.listen-address is DEPRECATED, please use statsd.listen-udp instead.")
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*statsdListenUDP = *statsdListenAddress
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}
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if *statsdListenUDP == "" && *statsdListenTCP == "" {
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log.Fatalln("At least one of UDP/TCP 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", *statsdListenUDP, *statsdListenTCP)
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log.Infoln("Accepting Prometheus Requests on", *listenAddress)
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go serveHTTP()
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events := make(chan Events, 1024)
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defer close(events)
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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}
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go ul.Listen(events)
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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}
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go tl.Listen(events)
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}
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mapper := &mapper.MetricMapper{}
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if *mappingConfig != "" {
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err := mapper.InitFromFile(*mappingConfig)
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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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go watchConfig(*mappingConfig, mapper)
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}
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exporter := NewExporter(mapper)
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exporter.Listen(events)
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}
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