// Run starts a background goroutine that watches for changes to services that
// have (or had) externalLoadBalancers=true and ensures that they have external
// load balancers created and deleted appropriately.
// nodeSyncPeriod controls how often we check the cluster's nodes to determine
// if external load balancers need to be updated to point to a new set.
func (s *ServiceController) Run(nodeSyncPeriod time.Duration) error {
if err := s.init(); err != nil {
return err
}
// We have to make this check beecause the ListWatch that we use in
// WatchServices requires Client functions that aren't in the interface
// for some reason.
if _, ok := s.qingClient.(*client.Client); !ok {
return fmt.Errorf("ServiceController only works with real Client objects, but was passed something else satisfying the client Interface.")
}
// Get the currently existing set of services and then all future creates
// and updates of services.
// No delta compressor is needed for the DeltaFIFO queue because we only ever
// care about the most recent state.
serviceQueue := cache.NewDeltaFIFO(cache.MetaNamespaceKeyFunc, nil, s.cache)
lw := cache.NewListWatchFromClient(s.qingClient.(*client.Client), "services", api.NamespaceAll, fields.Everything())
cache.NewReflector(lw, &api.Service{}, serviceQueue, 0).Run()
for i := 0; i < workerGoroutines; i++ {
go s.watchServices(serviceQueue)
}
nodeLister := &cache.StoreToNodeLister{cache.NewStore(cache.MetaNamespaceKeyFunc)}
nodeLW := cache.NewListWatchFromClient(s.qingClient.(*client.Client), "nodes", api.NamespaceAll, fields.Everything())
cache.NewReflector(nodeLW, &api.Node{}, nodeLister.Store, 0).Run()
go s.nodeSyncLoop(nodeLister, nodeSyncPeriod)
return nil
}
// NewSourceApiserver creates a config source that watches and pulls from the apiserver.
func NewSourceApiserver(c *client.Client, nodeName string, updates chan<- interface{}) {
lw := cache.NewListWatchFromClient(c, "pods", api.NamespaceAll, fields.OneTermEqualSelector(client.PodHost, nodeName))
newSourceApiserverFromLW(lw, updates)
}
// Returns a cache.ListWatch that gets all changes to services.
func createServiceLW(qingClient *kclient.Client) *kcache.ListWatch {
return kcache.NewListWatchFromClient(qingClient, "services", kapi.NamespaceAll, kSelector.Everything())
}
// Returns a cache.ListWatch that gets all changes to endpoints.
func createEndpointsLW(qingClient *kclient.Client) *kcache.ListWatch {
return kcache.NewListWatchFromClient(qingClient, "endpoints", kapi.NamespaceAll, kSelector.Everything())
}
// Returns a cache.ListWatch that gets all changes to services.
func (factory *ConfigFactory) createServiceLW() *cache.ListWatch {
return cache.NewListWatchFromClient(factory.Client, "services", api.NamespaceAll, parseSelectorOrDie(""))
}
// createMinionLW returns a cache.ListWatch that gets all changes to minions.
func (factory *ConfigFactory) createMinionLW() *cache.ListWatch {
// TODO: Filter out nodes that doesn't have NodeReady condition.
fields := fields.Set{client.NodeUnschedulable: "false"}.AsSelector()
return cache.NewListWatchFromClient(factory.Client, "nodes", api.NamespaceAll, fields)
}
// Returns a cache.ListWatch that finds all pods that are
// already scheduled.
// TODO: return a ListerWatcher interface instead?
func (factory *ConfigFactory) createAssignedPodLW() *cache.ListWatch {
return cache.NewListWatchFromClient(factory.Client, "pods", api.NamespaceAll,
parseSelectorOrDie(client.PodHost+"!="))
}
// Returns a cache.ListWatch that finds all pods that need to be
// scheduled.
func (factory *ConfigFactory) createUnassignedPodLW() *cache.ListWatch {
return cache.NewListWatchFromClient(factory.Client, "pods", api.NamespaceAll, fields.Set{client.PodHost: ""}.AsSelector())
}
// createAllPodsLW returns a listWatch that finds all pods
func createAllPodsLW(cl *client.Client) *cache.ListWatch {
return cache.NewListWatchFromClient(cl, "pods", api.NamespaceAll, parseSelectorOrDie(""))
}