// getNextNodeID returns the next id to use as zookeeper node index
func getNextNodeID(etcdPath string, etcdClient *etcd.Client, nodes []string) int {
result := 0
for _, node := range nodes {
id := etcd.Get(etcdClient, etcdPath+"/"+node+"/id")
numericID, err := strconv.Atoi(id)
if id != "" && err == nil && numericID > result {
result = numericID
}
}
return result + 1
}
func main() {
host := oswrapper.Getopt("HOST", "127.0.0.1")
etcdPort := oswrapper.Getopt("ETCD_PORT", "4001")
etcdCtlPeers := oswrapper.Getopt("ETCD_PEERS", "127.0.0.1:"+etcdPort)
etcdURL := etcd.GetHTTPEtcdUrls(host+":"+etcdPort, etcdCtlPeers)
etcdClient := etcd.NewClient(etcdURL)
etcd.Mkdir(etcdClient, etcdPath)
log.Infof("boot version [%v]", version.Version)
log.Info("zookeeper: starting...")
zookeeper.CheckZkMappingInFleet(etcdPath, etcdClient, etcdURL)
// we need to write the file /opt/zookeeper-data/data/myid with the id of this node
os.MkdirAll("/opt/zookeeper-data/data", 0640)
zkID := etcd.Get(etcdClient, etcdPath+"/"+host+"/id")
ioutil.WriteFile("/opt/zookeeper-data/data/myid", []byte(zkID), 0640)
zkServer := &zookeeper.ZkServer{
Stdout: os.Stdout,
Stderr: os.Stderr,
}
signal.Notify(signalChan,
syscall.SIGHUP,
syscall.SIGINT,
syscall.SIGKILL,
syscall.SIGTERM,
syscall.SIGQUIT,
os.Interrupt,
)
// Wait for a signal and exit
exitChan := make(chan int)
go func() {
for {
s := <-signalChan
log.Debugf("Signal received: %v", s)
switch s {
case syscall.SIGTERM:
exitChan <- 0
case syscall.SIGQUIT:
exitChan <- 0
case syscall.SIGKILL:
exitChan <- 1
default:
exitChan <- 1
}
}
}()
// wait for confd to run once and install initial templates
confd.WaitForInitialConf(getConfdNodes(host, etcdCtlPeers, 4001), 10*time.Second)
params := make(map[string]string)
params["HOST"] = host
if log.Level.String() == "debug" {
params["DEBUG"] = "true"
}
err := oswrapper.RunScript("pkg/boot/zookeeper/bash/add-node.bash", params, bindata.Asset)
if err != nil {
log.Printf("command finished with error: %v", err)
}
if err := zkServer.Start(); err != nil {
panic(err)
}
log.Info("zookeeper: running...")
go func() {
log.Debugf("starting pprof http server in port 6060")
http.ListenAndServe("localhost:6060", nil)
}()
code := <-exitChan
log.Debugf("execution terminated with exit code %v", code)
log.Debugf("executing pre shutdown script")
err = oswrapper.RunScript("pkg/boot/zookeeper/bash/remove-node.bash", params, bindata.Asset)
if err != nil {
log.Printf("command finished with error: %v", err)
}
log.Info("stopping zookeeper node")
zkServer.Stop()
}