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Merge pull request #110094 from tkashem/refactor-graceful

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apiserver: refactor - move AuditBackend.Run out of NonBlockingRun
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Kubernetes Prow Robot 2022-05-17 15:04:42 -07:00 committed by GitHub
commit f727b5af34
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1 changed files with 11 additions and 15 deletions
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26
staging/src/k8s.io/apiserver/pkg/server/genericapiserver.go
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@ -191,7 +191,7 @@ type GenericAPIServer struct {
livezGracePeriod time.Duration
livezClock clock.Clock
// auditing. The backend is started after the server starts listening.
// auditing. The backend is started before the server starts listening.
AuditBackend audit.Backend
// Authorizer determines whether a user is allowed to make a certain request. The Handler does a preliminary
@ -518,10 +518,20 @@ func (s preparedGenericAPIServer) Run(stopCh <-chan struct{}) error {
<-preShutdownHooksHasStoppedCh
}()
// Start the audit backend before any request comes in. This means we must call Backend.Run
// before http server start serving. Otherwise the Backend.ProcessEvents call might block.
// AuditBackend.Run will stop as soon as all in-flight requests are drained.
if s.AuditBackend != nil {
if err := s.AuditBackend.Run(drainedCh.Signaled()); err != nil {
return fmt.Errorf("failed to run the audit backend: %v", err)
}
}
stoppedCh, listenerStoppedCh, err := s.NonBlockingRun(stopHttpServerCh, shutdownTimeout)
if err != nil {
return err
}
httpServerStoppedListeningCh := s.lifecycleSignals.HTTPServerStoppedListening
go func() {
<-listenerStoppedCh
@ -567,18 +577,6 @@ func (s preparedGenericAPIServer) Run(stopCh <-chan struct{}) error {
// returned if the secure port cannot be listened on.
// The returned channel is closed when the (asynchronous) termination is finished.
func (s preparedGenericAPIServer) NonBlockingRun(stopCh <-chan struct{}, shutdownTimeout time.Duration) (<-chan struct{}, <-chan struct{}, error) {
// Use an stop channel to allow graceful shutdown without dropping audit events
// after http server shutdown.
auditStopCh := make(chan struct{})
// Start the audit backend before any request comes in. This means we must call Backend.Run
// before http server start serving. Otherwise the Backend.ProcessEvents call might block.
if s.AuditBackend != nil {
if err := s.AuditBackend.Run(auditStopCh); err != nil {
return nil, nil, fmt.Errorf("failed to run the audit backend: %v", err)
}
}
// Use an internal stop channel to allow cleanup of the listeners on error.
internalStopCh := make(chan struct{})
var stoppedCh <-chan struct{}
@ -588,7 +586,6 @@ func (s preparedGenericAPIServer) NonBlockingRun(stopCh <-chan struct{}, shutdow
stoppedCh, listenerStoppedCh, err = s.SecureServingInfo.Serve(s.Handler, shutdownTimeout, internalStopCh)
if err != nil {
close(internalStopCh)
close(auditStopCh)
return nil, nil, err
}
}
@ -603,7 +600,6 @@ func (s preparedGenericAPIServer) NonBlockingRun(stopCh <-chan struct{}, shutdow
<-stoppedCh
}
s.HandlerChainWaitGroup.Wait()
close(auditStopCh)
}()
s.RunPostStartHooks(stopCh)