forked from mirrors/statsd_exporter
213 lines
6.3 KiB
Go
213 lines
6.3 KiB
Go
// Copyright 2013 The Prometheus Authors
|
|
// 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 (
|
|
"bufio"
|
|
"net"
|
|
"net/http"
|
|
"os"
|
|
"strconv"
|
|
|
|
"github.com/howeyc/fsnotify"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"github.com/prometheus/common/log"
|
|
"github.com/prometheus/common/version"
|
|
"gopkg.in/alecthomas/kingpin.v2"
|
|
|
|
"github.com/prometheus/statsd_exporter/pkg/mapper"
|
|
)
|
|
|
|
func init() {
|
|
prometheus.MustRegister(version.NewCollector("statsd_exporter"))
|
|
}
|
|
|
|
func serveHTTP(listenAddress, metricsEndpoint string) {
|
|
http.Handle(metricsEndpoint, prometheus.Handler())
|
|
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
|
|
w.Write([]byte(`<html>
|
|
<head><title>StatsD Exporter</title></head>
|
|
<body>
|
|
<h1>StatsD Exporter</h1>
|
|
<p><a href="` + metricsEndpoint + `">Metrics</a></p>
|
|
</body>
|
|
</html>`))
|
|
})
|
|
log.Fatal(http.ListenAndServe(listenAddress, nil))
|
|
}
|
|
|
|
func ipPortFromString(addr string) (*net.IPAddr, int) {
|
|
host, portStr, err := net.SplitHostPort(addr)
|
|
if err != nil {
|
|
log.Fatal("Bad StatsD listening address", addr)
|
|
}
|
|
|
|
if host == "" {
|
|
host = "0.0.0.0"
|
|
}
|
|
ip, err := net.ResolveIPAddr("ip", host)
|
|
if err != nil {
|
|
log.Fatalf("Unable to resolve %s: %s", host, err)
|
|
}
|
|
|
|
port, err := strconv.Atoi(portStr)
|
|
if err != nil || port < 0 || port > 65535 {
|
|
log.Fatalf("Bad port %s: %s", portStr, err)
|
|
}
|
|
|
|
return ip, port
|
|
}
|
|
|
|
func udpAddrFromString(addr string) *net.UDPAddr {
|
|
ip, port := ipPortFromString(addr)
|
|
return &net.UDPAddr{
|
|
IP: ip.IP,
|
|
Port: port,
|
|
Zone: ip.Zone,
|
|
}
|
|
}
|
|
|
|
func tcpAddrFromString(addr string) *net.TCPAddr {
|
|
ip, port := ipPortFromString(addr)
|
|
return &net.TCPAddr{
|
|
IP: ip.IP,
|
|
Port: port,
|
|
Zone: ip.Zone,
|
|
}
|
|
}
|
|
|
|
func watchConfig(fileName string, mapper *mapper.MetricMapper) {
|
|
watcher, err := fsnotify.NewWatcher()
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
err = watcher.WatchFlags(fileName, fsnotify.FSN_MODIFY)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
for {
|
|
select {
|
|
case ev := <-watcher.Event:
|
|
log.Infof("Config file changed (%s), attempting reload", ev)
|
|
err = mapper.InitFromFile(fileName)
|
|
if err != nil {
|
|
log.Errorln("Error reloading config:", err)
|
|
configLoads.WithLabelValues("failure").Inc()
|
|
} else {
|
|
log.Infoln("Config reloaded successfully")
|
|
configLoads.WithLabelValues("success").Inc()
|
|
}
|
|
// Re-add the file watcher since it can get lost on some changes. E.g.
|
|
// saving a file with vim results in a RENAME-MODIFY-DELETE event
|
|
// sequence, after which the newly written file is no longer watched.
|
|
_ = watcher.WatchFlags(fileName, fsnotify.FSN_MODIFY)
|
|
case err := <-watcher.Error:
|
|
log.Errorln("Error watching config:", err)
|
|
}
|
|
}
|
|
}
|
|
|
|
func dumpFSM(mapper *mapper.MetricMapper, dumpFilename string) error {
|
|
f, err := os.Create(dumpFilename)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
log.Infoln("Start dumping FSM to", dumpFilename)
|
|
w := bufio.NewWriter(f)
|
|
mapper.FSM.DumpFSM(w)
|
|
w.Flush()
|
|
f.Close()
|
|
log.Infoln("Finish dumping FSM")
|
|
return nil
|
|
}
|
|
|
|
func main() {
|
|
var (
|
|
listenAddress = kingpin.Flag("web.listen-address", "The address on which to expose the web interface and generated Prometheus metrics.").Default(":9102").String()
|
|
metricsEndpoint = kingpin.Flag("web.telemetry-path", "Path under which to expose metrics.").Default("/metrics").String()
|
|
statsdListenUDP = kingpin.Flag("statsd.listen-udp", "The UDP address on which to receive statsd metric lines. \"\" disables it.").Default(":9125").String()
|
|
statsdListenTCP = kingpin.Flag("statsd.listen-tcp", "The TCP address on which to receive statsd metric lines. \"\" disables it.").Default(":9125").String()
|
|
mappingConfig = kingpin.Flag("statsd.mapping-config", "Metric mapping configuration file name.").String()
|
|
readBuffer = kingpin.Flag("statsd.read-buffer", "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.").Int()
|
|
dumpFSMPath = kingpin.Flag("statsd.dump-fsm", "The path to dump internal FSM generated for glob matching as Dot file.").Default("").String()
|
|
)
|
|
|
|
log.AddFlags(kingpin.CommandLine)
|
|
kingpin.Version(version.Print("statsd_exporter"))
|
|
kingpin.HelpFlag.Short('h')
|
|
kingpin.Parse()
|
|
|
|
if *statsdListenUDP == "" && *statsdListenTCP == "" {
|
|
log.Fatalln("At least one of UDP/TCP listeners must be specified.")
|
|
}
|
|
|
|
log.Infoln("Starting StatsD -> Prometheus Exporter", version.Info())
|
|
log.Infoln("Build context", version.BuildContext())
|
|
log.Infof("Accepting StatsD Traffic: UDP %v, TCP %v", *statsdListenUDP, *statsdListenTCP)
|
|
log.Infoln("Accepting Prometheus Requests on", *listenAddress)
|
|
|
|
go serveHTTP(*listenAddress, *metricsEndpoint)
|
|
|
|
events := make(chan Events, 1024)
|
|
defer close(events)
|
|
|
|
if *statsdListenUDP != "" {
|
|
udpListenAddr := udpAddrFromString(*statsdListenUDP)
|
|
uconn, err := net.ListenUDP("udp", udpListenAddr)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
if *readBuffer != 0 {
|
|
err = uconn.SetReadBuffer(*readBuffer)
|
|
if err != nil {
|
|
log.Fatal("Error setting UDP read buffer:", err)
|
|
}
|
|
}
|
|
|
|
ul := &StatsDUDPListener{conn: uconn}
|
|
go ul.Listen(events)
|
|
}
|
|
|
|
if *statsdListenTCP != "" {
|
|
tcpListenAddr := tcpAddrFromString(*statsdListenTCP)
|
|
tconn, err := net.ListenTCP("tcp", tcpListenAddr)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
defer tconn.Close()
|
|
|
|
tl := &StatsDTCPListener{conn: tconn}
|
|
go tl.Listen(events)
|
|
}
|
|
|
|
mapper := &mapper.MetricMapper{MappingsCount: mappingsCount}
|
|
if *mappingConfig != "" {
|
|
err := mapper.InitFromFile(*mappingConfig)
|
|
if err != nil {
|
|
log.Fatal("Error loading config:", err)
|
|
}
|
|
if *dumpFSMPath != "" {
|
|
err := dumpFSM(mapper, *dumpFSMPath)
|
|
if err != nil {
|
|
log.Fatal("Error dumpping FSM:", err)
|
|
}
|
|
}
|
|
go watchConfig(*mappingConfig, mapper)
|
|
}
|
|
exporter := NewExporter(mapper)
|
|
exporter.Listen(events)
|
|
}
|