Example #1
0
// etcdWatch calls etcd's Watch function, and handles any errors. Meant to be called
// as a goroutine.
func (w *etcdWatcher) etcdWatch(client tools.EtcdClient, key string, resourceVersion uint64) {
	defer util.HandleCrash()
	defer close(w.etcdError)
	if resourceVersion == 0 {
		latest, err := etcdGetInitialWatchState(client, key, w.list, w.etcdIncoming)
		if err != nil {
			w.etcdError <- err
			return
		}
		resourceVersion = latest + 1
	}
	_, err := client.Watch(key, resourceVersion, w.list, w.etcdIncoming, w.etcdStop)
	if err != nil && err != etcd.ErrWatchStoppedByUser {
		w.etcdError <- err
	}
}
Example #2
0
// etcdGetInitialWatchState turns an etcd Get request into a watch equivalent
func etcdGetInitialWatchState(client tools.EtcdClient, key string, recursive bool, incoming chan<- *etcd.Response) (resourceVersion uint64, err error) {
	resp, err := client.Get(key, false, recursive)
	if err != nil {
		if !IsEtcdNotFound(err) {
			glog.Errorf("watch was unable to retrieve the current index for the provided key (%q): %v", key, err)
			return resourceVersion, err
		}
		if index, ok := etcdErrorIndex(err); ok {
			resourceVersion = index
		}
		return resourceVersion, nil
	}
	resourceVersion = resp.EtcdIndex
	convertRecursiveResponse(resp.Node, resp, incoming)
	return
}
Example #3
0
func (s *SchedulerServer) fetchFrameworkID(client tools.EtcdClient) (*mesos.FrameworkID, error) {
	if s.FailoverTimeout > 0 {
		if response, err := client.Get(meta.FrameworkIDKey, false, false); err != nil {
			if !etcdstorage.IsEtcdNotFound(err) {
				return nil, fmt.Errorf("unexpected failure attempting to load framework ID from etcd: %v", err)
			}
			log.V(1).Infof("did not find framework ID in etcd")
		} else if response.Node.Value != "" {
			log.Infof("configuring FrameworkInfo with Id found in etcd: '%s'", response.Node.Value)
			return mutil.NewFrameworkID(response.Node.Value), nil
		}
	} else {
		//TODO(jdef) this seems like a totally hackish way to clean up the framework ID
		if _, err := client.Delete(meta.FrameworkIDKey, true); err != nil {
			if !etcdstorage.IsEtcdNotFound(err) {
				return nil, fmt.Errorf("failed to delete framework ID from etcd: %v", err)
			}
			log.V(1).Infof("nothing to delete: did not find framework ID in etcd")
		}
	}
	return nil, nil
}