func main() {
flag.Parse()
if *versionFlag {
fmt.Println(VERSION)
os.Exit(0)
}
if *logstashFlag {
log.ChangeToLogstashFormater(APP_NAME)
}
log.SetLogFile(LOG_FILE)
err := config.LoadConfig(*cfgFileFlag)
if err != nil {
log.Fatalln(err)
}
pid := os.Getpid() // This process's pid.
// Save the pid into the pid file.
err = utils.WriteFile(PID_FILE, []byte(strconv.Itoa(pid)), 0666)
if err != nil {
log.Fatalln(err)
}
defer os.Remove(PID_FILE)
clientSet, err := initClientSet()
if err != nil {
log.Fatalln(err)
}
go engine.Boot()
engine.Watcher, err = engine.NewWatch(clientSet)
if err != nil {
log.Fatalln(err)
}
go engine.Run()
if engine.CurrentDir == "" {
log.Fatalln("current directory is blank.")
}
err = utils.WriteFile(path.Join(path.Dir(engine.CurrentDir), ".version"), []byte(VERSION), 0644)
if err != nil {
log.Fatalln(err)
}
err = common.ConsulRegister(APP_NAME, path.Join(engine.CurrentDir, "deploy"))
if err != nil {
log.Fatalln(err)
}
// go api.Start()
// catch some signal
sigCh := make(chan os.Signal)
signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM, os.Kill)
// Block until a signal is received.
s := <-sigCh
log.Infof("Caught Signal: %s, shutting down...", s)
}
// Update or create
func heartbeat() {
log.Debugln("heartbeat......")
log.Debugln("stackDir is ", stackDir)
localComps := LocalComponents()
hbtRequest, err := buildHeartbeatRequest()
if err != nil {
log.Errorln(err)
return
}
hbtRequest.RemoteComponents = localComps
log.Infoln("request: ", hbtRequest)
// http request to server heartbeat url.
if config.AppConfig().Server == "" {
log.Errorln("configuration server is blank.")
return
}
heartbeatURL := fmt.Sprintf("http://%s/heartbeat", config.AppConfig().Server)
hbtResponse, err := requestHeartbeat(heartbeatURL, hbtRequest)
if err != nil {
log.Errorln(err)
return
}
log.Infoln("response: ", hbtResponse)
if hbtResponse != nil && hbtResponse.Components != nil {
log.Infoln("response comps : ", hbtResponse.Components)
for _, newComp := range hbtResponse.Components {
newComp.InitAttrs(stackDir)
log.Debugf("newComp: %s", newComp)
// 1. Create version directory. stack_dir/comp_name/version_number/
if utils.IsExist(newComp.VersionDir) {
_, err := utils.ExecCommand(false, "mkdir", "-p", newComp.VersionDir)
if err != nil {
log.Errorln(err)
continue
}
}
// 2. Download new version component.
downURL := fmt.Sprintf("http://%s/%s", config.AppConfig().Server, newComp.TarballFilename)
err = downloadFromURL(newComp.TarballFilepath, downURL)
if err != nil {
log.Errorln(err)
continue
}
// 3. Uncompress the new component file.
output, err := utils.ExecCommand(false, "tar", "-zxf", newComp.TarballFilepath, "-C", newComp.VersionDir)
if err != nil {
log.Errorln(err)
continue
}
log.Debugf("Untar file: %s , output: %s", newComp.TarballFilepath, output)
if newComp.Cmd == "start" {
if view != nil {
containers := view.Data.([]*Container)
switch newComp.Name {
case "dis-collectd":
{
err := rewriteConfigForCollectd(newComp, containers)
if err != nil {
log.Errorln("rewriteConfigForCollectd error: ", err)
continue
}
}
case "logstash-forwarder":
{
err := rewriteConfigForLogstashForwarder(newComp, containers)
if err != nil {
log.Errorln("rewriteConfigForLogstashForwarder error: ", err)
continue
}
}
}
}
log.Debugln("new component DeployFilepath = ", newComp.DeployFilepath)
output, err = utils.ExecCommand(false, newComp.DeployFilepath, "start")
if err != nil {
log.Errorln(err)
continue
}
log.Debugf("Execute command: %s %s, output: %s\n", newComp.DeployFilepath, newComp.Cmd, output)
// Componet directory was existed, then shutdown old verison component.
if utils.IsExist(path.Join(newComp.Directory, ".version")) {
oldVersion_b, err := utils.ReadFile(path.Join(newComp.Directory, ".version"))
if err != nil {
log.Errorln(err)
continue
}
oldDeployFilePath := path.Join(newComp.Directory, strings.TrimSpace(string(oldVersion_b)), "deploy")
_, err = utils.ExecCommand(false, oldDeployFilePath, "stop")
if err != nil {
log.Errorln(err)
continue
}
}
// Write the verion number to .version in the parent directory.
log.Debugln("write version number file, ", newComp.Directory)
err = utils.WriteFile(path.Join(newComp.Directory, ".version"), []byte(newComp.Version), 0644)
if err != nil {
log.Errorln(err)
continue
}
// Register this component to consul.
err = common.ConsulRegister(newComp.Name, newComp.DeployFilepath)
if err != nil {
log.Errorln(err)
continue
}
} else {
log.Debugln("new component DeployFilepath = ", newComp.DeployFilepath)
output, err = utils.ExecCommand(false, newComp.DeployFilepath, newComp.Cmd)
if err != nil {
log.Errorln(err)
continue
}
log.Debugln("Execute command: %s %s, output: %s\n", newComp.DeployFilepath, newComp.Cmd, output)
}
}
}
}