func (vs *VirtualServer) forceRestart() error {
vs.status.Log(status.Verbose, "Forcing kill server %v.", vs.VirtualServerName)
pid, err := util.ReadPidInt(vs.PidFile)
if e.Contains(err, ErrNoSuchFile) {
vs.status.Log(status.Verbose, "Server %v is about to restart. Pid file not found.", vs.VirtualServerName)
err := vs.forceKill()
if err != nil {
msg := "Forcekill script failed in " + vs.VirtualServerName + " with error: " + err.Error() + ". Giving up restart server."
msg += " Trace: " + e.Trace(e.Forward(err))
vs.status.Log(status.Verbose, msg)
return nil
}
goto restart
} else if err != nil {
return e.Forward(err)
}
err = syscall.Kill(pid, 9)
if err != nil {
return e.Forward(err)
}
restart:
err = vs.beforeStart()
if err != nil {
return e.Forward(err)
}
err = vs.restart()
if err != nil {
return e.Forward(err)
}
return nil
}
func (d *Daemon) changePid() {
pid, err := util.ReadPidInt(d.PidFile)
if err != nil {
d.pid = -1
return
}
if d.pid != pid {
if d.pid >= 0 {
d.status.LogAndEmail(status.Normal, "Pid "+d.DaemonName+" changed.", "Pid %v changed from %v to %v.", d.DaemonName, d.pid, pid)
}
d.pid = pid
}
}
func Init(d *Daemon) (monitors.Monitor, error) {
pid, err := util.ReadPidInt(d.PidFile)
if err != nil && !e.Contains(err, "no such file or directory") {
return nil, e.Forward(err)
}
if d.DaemonName == "" {
return nil, e.New("empty daemon name")
}
if d.RestartCmd == "" {
return nil, e.New("empty restart command")
}
if d.RestartArgs == nil {
return nil, e.New("restart arguments is invalid")
}
if d.PidFile == "" {
return nil, e.New("empty pid file")
}
if d.Sleep <= 0 {
return nil, e.New("sleep is equal or less than zero")
}
if d.Tries < 0 {
return nil, e.New("tries is equal or less than zero")
}
if d.Prio < 0 {
return nil, e.New("prio have to be greater or equal to zero")
}
if d.Queue == nil {
return nil, e.New("invalid queue")
}
if d.ExecTimeout <= 0 {
return nil, e.New("exectution timeout is greater than zero")
}
d.MonitorBase = base.New()
d.pid = pid
d.killMonitor = make(chan bool)
d.running = true
d.status = status.NewStatuses(d.DaemonName, d.Email, definitions.LengthStatusHistory, status.NewStatus, d.SendEvent, nil)
d.fswatcher, err = fsnotify.NewWatcher()
if err != nil {
return nil, e.Forward(err)
}
go func() {
F:
for {
select {
case ev := <-d.fswatcher.Event:
if ev == nil {
//watcher closed
return
}
if ev.Name != d.PidFile {
continue F
}
if ev.IsDelete() {
d.pid = -1
} else if !(ev.IsCreate() && ev.IsModify()) {
continue F
}
d.changePid()
case err := <-d.fswatcher.Error:
if err != nil {
d.status.Log(status.Verbose, "Pid file %v watcher error: %v", d.PidFile, e.Trace(e.Forward(err)))
}
}
}
}()
err = d.fswatcher.Watch(filepath.Dir(d.PidFile))
if err != nil {
return nil, e.Push(err, e.New("invalid pid file %v", d.PidFile))
}
d.monitor()
return d, nil
}