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main.go
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main.go
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package main
import (
"context"
"flag"
"fmt"
"log"
"net"
"os"
"os/signal"
"syscall"
)
var (
logLevel = flag.String("log-level", "info", "Log level: debug, info (default), warn, error, fatal.")
udpListenAddress = flag.String("udp-listen-address", "0.0.0.0:9090", "The address to listen on for udp stats requests.")
httpListenAddress = flag.String("http-listen-address", "0.0.0.0:9091", "The address to listen on for http stat and telemetry requests.")
)
func main() {
flag.Parse()
ctx, cancel := context.WithCancel(context.Background())
var err error
*udpListenAddress, err = ListenAddress(*udpListenAddress)
if err != nil {
log.Fatalf(err.Error())
}
*httpListenAddress, err = ListenAddress(*httpListenAddress)
if err != nil {
log.Fatalf(err.Error())
}
go listenUDP(ctx)
go listenHTTP(ctx)
handleSIGTERM(cancel)
}
func handleSIGTERM(cancel func()) {
sigc := make(chan os.Signal, 1)
signal.Notify(sigc, syscall.SIGTERM)
<-sigc
cancel()
}
// ListenAddress Format a correct listen address
func ListenAddress(s string) (string, error) {
host, port, err := net.SplitHostPort(s)
if err != nil {
return "", err
}
return fmt.Sprintf("%s:%s", host, port), nil
}