Fix memory leak in listenProviders

Signed-off-by: Emile Vauge <emile@vauge.com>

provider/docker.go

@@ -107,6 +107,15 @@ func (provider *Docker) Provide(configurationChan chan<- types.ConfigMessage, po
 			}
 			if provider.Watch {
 				ctx, cancel := context.WithCancel(ctx)
+				pool.Go(func(stop chan bool) {
+					for {
+						select {
+						case <-stop:
+							cancel()
+							return
+						}
+					}
+				})
 				f := filters.NewArgs()
 				f.Add("type", "container")
 				options := dockertypes.EventsOptions{
@@ -134,15 +143,6 @@ func (provider *Docker) Provide(configurationChan chan<- types.ConfigMessage, po
 				eventHandler.Handle("die", startStopHandle)
 
 				errChan := events.MonitorWithHandler(ctx, dockerClient, options, eventHandler)
-				pool.Go(func(stop chan bool) {
-					for {
-						select {
-						case <-stop:
-							cancel()
-							return
-						}
-					}
-				})
 				if err := <-errChan; err != nil {
 					return err
 				}

server.go

@@ -149,11 +149,8 @@ func (server *Server) listenProviders(stop chan bool) {
 				server.configurationValidatedChan <- configMsg
 			} else {
 				log.Debugf("Last %s config received less than %s, waiting...", configMsg.ProviderName, server.globalConfiguration.ProvidersThrottleDuration)
-				server.routinesPool.Go(func(stop chan bool) {
-					select {
-					case <-stop:
-						return
-					case <-time.After(server.globalConfiguration.ProvidersThrottleDuration):
+				safe.Go(func() {
+					<-time.After(server.globalConfiguration.ProvidersThrottleDuration)
 					lastReceivedConfigurationValue := lastReceivedConfiguration.Get().(time.Time)
 					if time.Now().After(lastReceivedConfigurationValue.Add(time.Duration(server.globalConfiguration.ProvidersThrottleDuration))) {
 						log.Debugf("Waited for %s config, OK", configMsg.ProviderName)
@@ -161,7 +158,6 @@ func (server *Server) listenProviders(stop chan bool) {
 							server.configurationValidatedChan <- *lastConfig.(*types.ConfigMessage)
 						}
 					}
-					}
 				})
 			}
 			lastReceivedConfiguration.Set(time.Now())