Use context.TODO() to be explicit that cancellation is not implemented

cmd/cloud-controller-manager/app/controllermanager.go

@@ -157,11 +157,8 @@ func Run(c *cloudcontrollerconfig.CompletedConfig) error {
 		}
 	}
 
-	runCtx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-
 	if !c.ComponentConfig.GenericComponent.LeaderElection.LeaderElect {
-		run(runCtx)
+		run(context.TODO())
 		panic("unreachable")
 	}
 
@@ -187,7 +184,7 @@ func Run(c *cloudcontrollerconfig.CompletedConfig) error {
 	}
 
 	// Try and become the leader and start cloud controller manager loops
-	leaderelection.RunOrDie(runCtx, leaderelection.LeaderElectionConfig{
+	leaderelection.RunOrDie(context.TODO(), leaderelection.LeaderElectionConfig{
 		Lock:          rl,
 		LeaseDuration: c.ComponentConfig.GenericComponent.LeaderElection.LeaseDuration.Duration,
 		RenewDeadline: c.ComponentConfig.GenericComponent.LeaderElection.RenewDeadline.Duration,

cmd/kube-controller-manager/app/controllermanager.go

@@ -181,11 +181,8 @@ func Run(c *config.CompletedConfig) error {
 		select {}
 	}
 
-	runCtx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-
 	if !c.ComponentConfig.GenericComponent.LeaderElection.LeaderElect {
-		run(runCtx)
+		run(context.TODO())
 		panic("unreachable")
 	}
 
@@ -208,7 +205,7 @@ func Run(c *config.CompletedConfig) error {
 		glog.Fatalf("error creating lock: %v", err)
 	}
 
-	leaderelection.RunOrDie(runCtx, leaderelection.LeaderElectionConfig{
+	leaderelection.RunOrDie(context.TODO(), leaderelection.LeaderElectionConfig{
 		Lock:          rl,
 		LeaseDuration: c.ComponentConfig.GenericComponent.LeaderElection.LeaseDuration.Duration,
 		RenewDeadline: c.ComponentConfig.GenericComponent.LeaderElection.RenewDeadline.Duration,

cmd/kube-scheduler/app/server.go

@@ -187,14 +187,14 @@ func Run(c schedulerserverconfig.CompletedConfig, stopCh <-chan struct{}) error
 		<-ctx.Done()
 	}
 
-	runCtx, cancel := context.WithCancel(context.TODO()) // once Run() accepts a context, it should be used here
+	ctx, cancel := context.WithCancel(context.TODO()) // TODO once Run() accepts a context, it should be used here
 	defer cancel()
 
 	go func() {
 		select {
 		case <-stopCh:
 			cancel()
-		case <-runCtx.Done():
+		case <-ctx.Done():
 		}
 	}()
 
@@ -211,13 +211,13 @@ func Run(c schedulerserverconfig.CompletedConfig, stopCh <-chan struct{}) error
 			return fmt.Errorf("couldn't create leader elector: %v", err)
 		}
 
-		leaderElector.Run(runCtx)
+		leaderElector.Run(ctx)
 
 		return fmt.Errorf("lost lease")
 	}
 
 	// Leader election is disabled, so run inline until done.
-	run(runCtx)
+	run(ctx)
 	return fmt.Errorf("finished without leader elect")
 }
 

staging/src/k8s.io/client-go/tools/leaderelection/leaderelection.go

@@ -208,10 +208,9 @@ func (le *LeaderElector) renew(ctx context.Context) {
 	ctx, cancel := context.WithCancel(ctx)
 	defer cancel()
 	wait.Until(func() {
-		// PollUntil() sleeps for "interval" duration before calling the function so we need to increase the timeout by le.config.RetryPeriod
+		timeoutCtx, timeoutCancel := context.WithTimeout(ctx, le.config.RenewDeadline)
-		timeoutCtx, timeoutCancel := context.WithTimeout(ctx, le.config.RetryPeriod+le.config.RenewDeadline)
 		defer timeoutCancel()
-		err := wait.PollUntil(le.config.RetryPeriod, func() (bool, error) {
+		err := wait.PollImmediateUntil(le.config.RetryPeriod, func() (bool, error) {
 			return le.tryAcquireOrRenew(), nil
 		}, timeoutCtx.Done())
 		le.maybeReportTransition()