func Status() {
if !util.FileExists(util.PidFile()) {
fmt.Println("REX-Ray is stopped")
return
}
pid, _ := util.ReadPidFile()
fmt.Printf("REX-Ray is running at pid %d\n", pid)
}
func Restart() {
checkOpPerms("restarted")
if util.FileExists(util.PidFile()) {
Stop()
}
Start()
}
func Stop() {
checkOpPerms("stopped")
if !util.FileExists(util.PidFile()) {
fmt.Println("REX-Ray is already stopped")
panic(1)
}
fmt.Print("Shutting down REX-Ray...")
pid, pidErr := util.ReadPidFile()
failOnError(pidErr)
proc, procErr := os.FindProcess(pid)
failOnError(procErr)
killErr := proc.Signal(syscall.SIGHUP)
failOnError(killErr)
fmt.Println("SUCCESS!")
}
func Start() {
checkOpPerms("started")
log.WithField("os.Args", os.Args).Debug("invoking service start")
pidFile := util.PidFile()
if util.FileExists(pidFile) {
pid, pidErr := util.ReadPidFile()
if pidErr != nil {
fmt.Printf("Error reading REX-Ray PID file at %s\n", pidFile)
} else {
fmt.Printf("REX-Ray already running at PID %d\n", pid)
}
panic(1)
}
if fg || client != "" {
startDaemon()
} else {
tryToStartDaemon()
}
}
func startDaemon() {
fmt.Printf("%s\n", RexRayLogoAscii)
var success []byte
var failure []byte
var conn net.Conn
if !fg {
success = []byte{0}
failure = []byte{1}
var dialErr error
log.Printf("Dialing %s\n", client)
conn, dialErr = net.Dial("unix", client)
if dialErr != nil {
panic(dialErr)
}
}
writePidErr := util.WritePidFile(-1)
if writePidErr != nil {
if conn != nil {
conn.Write(failure)
}
panic(writePidErr)
}
defer func() {
r := recover()
os.Remove(util.PidFile())
if r != nil {
panic(r)
}
}()
log.Printf("Created pid file, pid=%d\n", os.Getpid())
init := make(chan error)
sigc := make(chan os.Signal, 1)
stop := make(chan os.Signal)
signal.Notify(sigc,
syscall.SIGKILL,
syscall.SIGHUP,
syscall.SIGINT,
syscall.SIGTERM,
syscall.SIGQUIT)
go func() {
rrdaemon.Start(c.Host, init, stop)
}()
initErrors := make([]error, 0)
for initErr := range init {
initErrors = append(initErrors, initErr)
log.Println(initErr)
}
if conn != nil {
if len(initErrors) == 0 {
conn.Write(success)
} else {
conn.Write(failure)
}
conn.Close()
}
if len(initErrors) > 0 {
return
}
sigv := <-sigc
log.Printf("Received shutdown signal %v\n", sigv)
stop <- sigv
}