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main.go
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package main
import (
"context"
"github.com/andy722/fluent-forwarder/metrics"
log "github.com/sirupsen/logrus"
flag "github.com/spf13/pflag"
"net/http"
"os"
"os/signal"
"runtime"
"syscall"
)
import _ "net/http/pprof"
func init() {
runtime.GOMAXPROCS(1)
}
func main() {
var forwarderOptions = ForwarderOptions{}
var showHelp = false
var httpBindAddress string
var logLevel = "info"
flag.BoolVarP(&showHelp, "help", "h", showHelp, "Show help message")
flag.StringVarP(&logLevel, "log", "", logLevel, "Logging level (trace,debug,info,warn,error,fatal)")
flag.StringVarP(&forwarderOptions.InputFwd, "input-fwd", "", "", "Listen for incoming fluentd traffic. \nEither tcp://HOST:PORT or unix://SOCKET_PATH")
flag.Lookup("input-fwd").NoOptDefVal = "tcp://0.0.0.0:24224"
flag.StringVarP(&forwarderOptions.WalPath, "wal", "", "/opt/logs/.buffer", "Buffer directory")
flag.StringVarP(&forwarderOptions.LogPath, "target-log", "", "", "Target log directory")
flag.Lookup("target-log").NoOptDefVal = "/opt/logs"
flag.StringVarP(&forwarderOptions.ForwardAddr, "target-fwd", "", "", "Target forwarder, tcp://FLUENT_HOST:PORT")
flag.StringVarP(&httpBindAddress, "http", "", "", "Profiling and monitoring URI (ex. 0.0.0.0:24225)")
flag.Lookup("http").NoOptDefVal = "0.0.0.0:24225"
flag.Parse()
if showHelp {
flag.Usage()
os.Exit(0)
}
initLogging(logLevel)
if httpBindAddress != "" {
go startHTTP(httpBindAddress)
}
log.Infof("Starting forwarder: %+v", forwarderOptions)
app, err := NewForwarder(forwarderOptions)
if err != nil {
log.Fatalf("Startup failed: %v", err)
}
ctx, cancel := context.WithCancel(context.Background())
go waitOnSignal(cancel)
app.Run(ctx)
}
func initLogging(loglevel string) {
{
actualLevel := log.InfoLevel
if parsedLevel, err := log.ParseLevel(loglevel); err != nil {
log.Warnf("Invalid log level: %v, using default %v", loglevel, actualLevel)
} else {
actualLevel = parsedLevel
log.StandardLogger().Logf(actualLevel, "%v logging enabled", actualLevel)
}
log.SetLevel(actualLevel)
}
log.SetOutput(os.Stdout)
log.SetFormatter(&log.TextFormatter{
//ForceColors: true,
FullTimestamp: true,
})
}
func startHTTP(bindAddress string) {
http.Handle("/metrics", metrics.Handler)
log.Info("Serving metrics at ", bindAddress)
if err := http.ListenAndServe(bindAddress, nil); err != nil {
log.Fatalf("Failed binding to [%s]: %+v\n", bindAddress, err)
}
}
func waitOnSignal(cancel context.CancelFunc) {
signals := make(chan os.Signal, 1)
signal.Notify(signals, syscall.SIGTERM, syscall.SIGINT)
sig := <-signals
log.Printf("Caught %v", sig)
cancel()
}