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main.go
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main.go
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package main
import (
"flag"
"log"
"os"
"os/signal"
"syscall"
"syslog_drain_binder/config"
"time"
"syslog_drain_binder/elector"
"syslog_drain_binder/etcd_syslog_drain_store"
"signalmanager"
"code.cloudfoundry.org/workpool"
"github.com/cloudfoundry/dropsonde"
"github.com/cloudfoundry/dropsonde/metrics"
"github.com/cloudfoundry/storeadapter/etcdstoreadapter"
)
var (
logFilePath = flag.String("logFile", "", "The agent log file, defaults to STDOUT")
configFile = flag.String("config", "config/syslog_drain_binder.json", "Location of the Syslog Drain Binder config json file")
)
func main() {
flag.Parse()
conf, err := config.ParseConfig(*configFile)
if err != nil {
panic(err)
}
dropsonde.Initialize(conf.MetronAddress, "syslog_drain_binder")
workPool, err := workpool.NewWorkPool(conf.EtcdMaxConcurrentRequests)
if err != nil {
panic(err)
}
options := &etcdstoreadapter.ETCDOptions{
ClusterUrls: conf.EtcdUrls,
}
if conf.EtcdRequireTLS {
options.IsSSL = true
options.CertFile = conf.EtcdTLSClientConfig.CertFile
options.KeyFile = conf.EtcdTLSClientConfig.KeyFile
options.CAFile = conf.EtcdTLSClientConfig.CAFile
}
adapter, err := etcdstoreadapter.New(options, workPool)
if err != nil {
panic(err)
}
updateInterval := time.Duration(conf.UpdateIntervalSeconds) * time.Second
politician := elector.NewElector(conf.InstanceName, adapter, updateInterval)
drainTTL := time.Duration(conf.DrainUrlTtlSeconds) * time.Second
store := etcd_syslog_drain_store.NewEtcdSyslogDrainStore(adapter, drainTTL)
dumpChan := registerGoRoutineDumpSignalChannel()
ticker := time.NewTicker(updateInterval)
for {
select {
case <-dumpChan:
signalmanager.DumpGoRoutine()
case <-ticker.C:
if politician.IsLeader() {
err = politician.StayAsLeader()
if err != nil {
log.Printf("Error when staying leader: %s", err.Error())
politician.Vacate()
continue
}
} else {
err = politician.RunForElection()
if err != nil {
log.Printf("Error when running for leader: %s", err.Error())
politician.Vacate()
continue
}
}
drainUrls, err := Poll(
conf.CloudControllerAddress,
conf.BulkApiUsername,
conf.BulkApiPassword,
conf.PollingBatchSize,
SkipCertVerify(conf.SkipCertVerify),
)
if err != nil {
log.Printf("Error when polling cloud controller: %s", err.Error())
politician.Vacate()
continue
}
metrics.IncrementCounter("pollCount")
var totalDrains int
for _, drainList := range drainUrls {
totalDrains += len(drainList)
}
metrics.SendValue("totalDrains", float64(totalDrains), "drains")
err = store.UpdateDrains(drainUrls)
if err != nil {
log.Printf("Error when updating ETCD: %s", err.Error())
politician.Vacate()
continue
}
}
}
}
func registerGoRoutineDumpSignalChannel() chan os.Signal {
threadDumpChan := make(chan os.Signal)
signal.Notify(threadDumpChan, syscall.SIGUSR1)
return threadDumpChan
}