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Fix possible race in shutdown callbacks process and simplify shuttting down profiler (#2684)

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This commit is contained in:
Anis Elleuch 2016-09-14 02:43:45 +01:00 committed by Harshavardhana
parent 51e337228e
commit f82f535509
1 changed files with 36 additions and 35 deletions
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71
cmd/utils.go
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@ -117,16 +117,30 @@ type shutdownCallbacks struct {
// globalShutdownCBs stores regular and object storages callbacks
var globalShutdownCBs *shutdownCallbacks
func (s shutdownCallbacks) GetObjectLayerCBs() []cleanupOnExitFunc {
func (s *shutdownCallbacks) RunObjectLayerCBs() errCode {
s.RLock()
defer s.RUnlock()
return s.objectLayerCallbacks
exitCode := exitSuccess
for _, callback := range s.objectLayerCallbacks {
exitCode = callback()
if exitCode != exitSuccess {
break
}
}
return exitCode
}
func (s shutdownCallbacks) GetGenericCBs() []cleanupOnExitFunc {
func (s *shutdownCallbacks) RunGenericCBs() errCode {
s.RLock()
defer s.RUnlock()
return s.genericCallbacks
exitCode := exitSuccess
for _, callback := range s.genericCallbacks {
exitCode = callback()
if exitCode != exitSuccess {
break
}
}
return exitCode
}
func (s *shutdownCallbacks) AddObjectLayerCB(callback cleanupOnExitFunc) error {
@ -203,6 +217,16 @@ func startMonitorShutdownSignal(onExitFn onExitFunc) error {
return errInvalidArgument
}
// Custom exit function
runExitFn := func(exitCode errCode) {
// If global profiler is set stop before we exit.
if globalProfiler != nil {
globalProfiler.Stop()
}
// Call user supplied user exit function
onExitFn(int(exitCode))
}
// Start listening on shutdown signal.
go func() {
defer close(globalShutdownSignalCh)
@ -216,27 +240,14 @@ func startMonitorShutdownSignal(onExitFn onExitFunc) error {
globalShutdownSignalCh <- shutdownHalt
case signal := <-globalShutdownSignalCh:
// Call all object storage shutdown callbacks and exit for emergency
for _, callback := range globalShutdownCBs.GetObjectLayerCBs() {
exitCode := callback()
if exitCode != exitSuccess {
// If global profiler is set stop before we exit.
if globalProfiler != nil {
globalProfiler.Stop()
}
onExitFn(int(exitCode))
}
exitCode := globalShutdownCBs.RunObjectLayerCBs()
if exitCode != exitSuccess {
runExitFn(exitCode)
}
// Call all callbacks and exit for emergency
for _, callback := range globalShutdownCBs.GetGenericCBs() {
exitCode := callback()
if exitCode != exitSuccess {
// If global profiler is set stop before we exit.
if globalProfiler != nil {
globalProfiler.Stop()
}
onExitFn(int(exitCode))
}
exitCode = globalShutdownCBs.RunGenericCBs()
if exitCode != exitSuccess {
runExitFn(exitCode)
}
// All shutdown callbacks ensure that the server is safely terminated
// and any concurrent process could be started again
@ -252,22 +263,12 @@ func startMonitorShutdownSignal(onExitFn onExitFunc) error {
errorIf(errors.New("Unable to reboot."), err.Error())
}
// If global profiler is set stop before we exit.
if globalProfiler != nil {
globalProfiler.Stop()
}
// Successfully forked.
onExitFn(int(exitSuccess))
}
// If global profiler is set stop before we exit.
if globalProfiler != nil {
globalProfiler.Stop()
runExitFn(exitSuccess)
}
// Exit as success if no errors.
onExitFn(int(exitSuccess))
runExitFn(exitSuccess)
}
}
}()