Пример #1
0
// WatchEnvironMachines returns a StringsWatcher that notifies of
// changes to the life cycles of the top level machines in the current
// environment.
func (e *EnvironMachinesWatcher) WatchEnvironMachines() (params.StringsWatchResult, error) {
	result := params.StringsWatchResult{}
	if !e.authorizer.AuthEnvironManager() {
		return result, ErrPerm
	}
	watch := e.st.WatchEnvironMachines()
	// Consume the initial event and forward it to the result.
	if changes, ok := <-watch.Changes(); ok {
		result.StringsWatcherId = e.resources.Register(watch)
		result.Changes = changes
	} else {
		err := watcher.EnsureErr(watch)
		return result, fmt.Errorf("cannot obtain initial environment machines: %v", err)
	}
	return result, nil
}
Пример #2
0
func (s *StorageProvisionerAPI) watchStorageEntities(
	args params.Entities,
	watchEnvironStorage func() state.StringsWatcher,
	watchMachineStorage func(names.MachineTag) state.StringsWatcher,
) (params.StringsWatchResults, error) {
	canAccess, err := s.getScopeAuthFunc()
	if err != nil {
		return params.StringsWatchResults{}, common.ServerError(common.ErrPerm)
	}
	results := params.StringsWatchResults{
		Results: make([]params.StringsWatchResult, len(args.Entities)),
	}
	one := func(arg params.Entity) (string, []string, error) {
		tag, err := names.ParseTag(arg.Tag)
		if err != nil || !canAccess(tag) {
			return "", nil, common.ErrPerm
		}
		var w state.StringsWatcher
		if tag, ok := tag.(names.MachineTag); ok {
			w = watchMachineStorage(tag)
		} else {
			w = watchEnvironStorage()
		}
		if changes, ok := <-w.Changes(); ok {
			return s.resources.Register(w), changes, nil
		}
		return "", nil, watcher.EnsureErr(w)
	}
	for i, arg := range args.Entities {
		var result params.StringsWatchResult
		id, changes, err := one(arg)
		if err != nil {
			result.Error = common.ServerError(err)
		} else {
			result.StringsWatcherId = id
			result.Changes = changes
		}
		results.Results[i] = result
	}
	return results, nil
}