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✨ Use anonymous function for locking when serving health probes #1313

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merged 1 commit into from Jan 2, 2021
Merged

✨ Use anonymous function for locking when serving health probes #1313

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47 changes: 24 additions & 23 deletions pkg/manager/internal.go
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Expand Up @@ -418,34 +418,35 @@ func (cm *controllerManager) serveMetrics() {
}

func (cm *controllerManager) serveHealthProbes() {
// TODO(hypnoglow): refactor locking to use anonymous func in the similar way
// it's done in serveMetrics.
cm.mu.Lock()
mux := http.NewServeMux()

if cm.readyzHandler != nil {
mux.Handle(cm.readinessEndpointName, http.StripPrefix(cm.readinessEndpointName, cm.readyzHandler))
// Append '/' suffix to handle subpaths
mux.Handle(cm.readinessEndpointName+"/", http.StripPrefix(cm.readinessEndpointName, cm.readyzHandler))
}
if cm.healthzHandler != nil {
mux.Handle(cm.livenessEndpointName, http.StripPrefix(cm.livenessEndpointName, cm.healthzHandler))
// Append '/' suffix to handle subpaths
mux.Handle(cm.livenessEndpointName+"/", http.StripPrefix(cm.livenessEndpointName, cm.healthzHandler))
}

server := http.Server{
Handler: mux,
}
// Run server
cm.startRunnable(RunnableFunc(func(_ context.Context) error {
if err := server.Serve(cm.healthProbeListener); err != nil && err != http.ErrServerClosed {
return err

func() {
cm.mu.Lock()
defer cm.mu.Unlock()

if cm.readyzHandler != nil {
mux.Handle(cm.readinessEndpointName, http.StripPrefix(cm.readinessEndpointName, cm.readyzHandler))
// Append '/' suffix to handle subpaths
mux.Handle(cm.readinessEndpointName+"/", http.StripPrefix(cm.readinessEndpointName, cm.readyzHandler))
}
return nil
}))
cm.healthzStarted = true
cm.mu.Unlock()
if cm.healthzHandler != nil {
mux.Handle(cm.livenessEndpointName, http.StripPrefix(cm.livenessEndpointName, cm.healthzHandler))
// Append '/' suffix to handle subpaths
mux.Handle(cm.livenessEndpointName+"/", http.StripPrefix(cm.livenessEndpointName, cm.healthzHandler))
}

// Run server
cm.startRunnable(RunnableFunc(func(_ context.Context) error {
if err := server.Serve(cm.healthProbeListener); err != nil && err != http.ErrServerClosed {
return err
}
return nil
}))
cm.healthzStarted = true
}()

// Shutdown the server when stop is closed
<-cm.internalProceduresStop
Expand Down