// Returns an error if processing the delta failed, along with a boolean
// indicator of whether the processing should be retried.
func (s *ServiceController) processDelta(delta *cache.Delta) (error, bool) {
service, ok := delta.Object.(*api.Service)
var namespacedName types.NamespacedName
var cachedService *cachedService
if !ok {
// If the DeltaFIFO saw a key in our cache that it didn't know about, it
// can send a deletion with an unknown state. Grab the service from our
// cache for deleting.
key, ok := delta.Object.(cache.DeletedFinalStateUnknown)
if !ok {
return fmt.Errorf("Delta contained object that wasn't a service or a deleted key: %+v", delta), notRetryable
}
cachedService, ok = s.cache.get(key.Key)
if !ok {
return fmt.Errorf("Service %s not in cache even though the watcher thought it was. Ignoring the deletion.", key), notRetryable
}
service = cachedService.service
delta.Object = cachedService.service
namespacedName = types.NamespacedName{service.Namespace, service.Name}
} else {
namespacedName.Namespace = service.Namespace
namespacedName.Name = service.Name
cachedService = s.cache.getOrCreate(namespacedName.String())
}
glog.V(2).Infof("Got new %s delta for service: %+v", delta.Type, service)
// Ensure that no other goroutine will interfere with our processing of the
// service.
cachedService.mu.Lock()
defer cachedService.mu.Unlock()
// TODO: Handle added, updated, and sync differently?
switch delta.Type {
case cache.Added:
fallthrough
case cache.Updated:
fallthrough
case cache.Sync:
err, retry := s.createLoadBalancerIfNeeded(namespacedName, service, cachedService.service)
if err != nil {
return err, retry
}
// Always update the cache upon success.
// NOTE: Since we update the cached service if and only if we successully
// processed it, a cached service being nil implies that it hasn't yet
// been successfully processed.
cachedService.service = service
s.cache.set(namespacedName.String(), cachedService)
case cache.Deleted:
err := s.balancer.EnsureTCPLoadBalancerDeleted(s.loadBalancerName(service), s.zone.Region)
if err != nil {
return err, retryable
}
s.cache.delete(namespacedName.String())
default:
glog.Errorf("Unexpected delta type: %v", delta.Type)
}
return nil, notRetryable
}
