func (s *SpacesSuite) checkAddSpaces(c *gc.C, p checkAddSpacesParams) {
	args := params.CreateSpaceParams{}
	if p.Name != "" {
		args.SpaceTag = "space-" + p.Name
	}
	if len(p.Subnets) > 0 {
		for _, cidr := range p.Subnets {
			args.SubnetTags = append(args.SubnetTags, "subnet-"+cidr)
		}
	}
	args.Public = p.Public

	spaces := params.CreateSpacesParams{}
	spaces.Spaces = append(spaces.Spaces, args)
	results, err := s.facade.CreateSpaces(spaces)

	c.Assert(len(results.Results), gc.Equals, 1)
	c.Assert(err, gc.IsNil)
	if p.Error == "" {
		c.Assert(results.Results[0].Error, gc.IsNil)
	} else {
		c.Assert(results.Results[0].Error, gc.NotNil)
		c.Assert(results.Results[0].Error, gc.ErrorMatches, p.Error)
	}

	if p.Error == "" || p.MakesCall {
		apiservertesting.CheckMethodCalls(c, apiservertesting.SharedStub,
			apiservertesting.BackingCall("AddSpace", p.Name, p.Subnets, p.Public),
		)
	} else {
		apiservertesting.CheckMethodCalls(c, apiservertesting.SharedStub)
	}
}

func (s *SpacesSuite) checkCreateSpaces(c *gc.C, p checkCreateSpacesParams) {
	args := params.CreateSpaceParams{}
	if p.Name != "" {
		args.SpaceTag = "space-" + p.Name
	}
	if len(p.Subnets) > 0 {
		for _, cidr := range p.Subnets {
			args.SubnetTags = append(args.SubnetTags, "subnet-"+cidr)
		}
	}
	args.Public = p.Public
	args.ProviderId = p.ProviderId

	spaces := params.CreateSpacesParams{}
	spaces.Spaces = append(spaces.Spaces, args)
	results, err := networkingcommon.CreateSpaces(apiservertesting.BackingInstance, spaces)

	c.Assert(len(results.Results), gc.Equals, 1)
	c.Assert(err, gc.IsNil)
	if p.Error == "" {
		c.Assert(results.Results[0].Error, gc.IsNil)
	} else {
		c.Assert(results.Results[0].Error, gc.NotNil)
		c.Assert(results.Results[0].Error, gc.ErrorMatches, p.Error)
	}

	baseCalls := []apiservertesting.StubMethodCall{
		apiservertesting.BackingCall("ModelConfig"),
		apiservertesting.BackingCall("CloudSpec"),
		apiservertesting.ProviderCall("Open", apiservertesting.BackingInstance.EnvConfig),
		apiservertesting.ZonedNetworkingEnvironCall("SupportsSpaces"),
	}

	addSpaceCalls := append(baseCalls, apiservertesting.BackingCall("AddSpace", p.Name, network.Id(p.ProviderId), p.Subnets, p.Public))

	if p.Error == "" {
		apiservertesting.CheckMethodCalls(c, apiservertesting.SharedStub, addSpaceCalls...)
	} else {
		apiservertesting.CheckMethodCalls(c, apiservertesting.SharedStub, baseCalls...)
	}
}

func (dw *discoverspacesWorker) handleSubnets() error {
	environ, ok := environs.SupportsNetworking(dw.config.Environ)
	if !ok {
		logger.Debugf("not a networking environ")
		return nil
	}
	if supported, err := environ.SupportsSpaceDiscovery(); err != nil {
		return errors.Trace(err)
	} else if !supported {
		logger.Debugf("environ does not support space discovery")
		return nil
	}
	providerSpaces, err := environ.Spaces()
	if err != nil {
		return errors.Trace(err)
	}

	facade := dw.config.Facade
	listSpacesResult, err := facade.ListSpaces()
	if err != nil {
		return errors.Trace(err)
	}
	stateSubnets, err := facade.ListSubnets(params.SubnetsFilters{})
	if err != nil {
		return errors.Trace(err)
	}

	stateSubnetIds := make(set.Strings)
	for _, subnet := range stateSubnets.Results {
		stateSubnetIds.Add(subnet.ProviderId)
	}
	stateSpaceMap := make(map[string]params.ProviderSpace)
	spaceNames := make(set.Strings)
	for _, space := range listSpacesResult.Results {
		stateSpaceMap[space.ProviderId] = space
		spaceNames.Add(space.Name)
	}

	// TODO(mfoord): we need to delete spaces and subnets that no longer
	// exist, so long as they're not in use.
	var createSpacesArgs params.CreateSpacesParams
	var addSubnetsArgs params.AddSubnetsParams
	for _, space := range providerSpaces {
		// Check if the space is already in state, in which case we know
		// its name.
		stateSpace, ok := stateSpaceMap[string(space.ProviderId)]
		var spaceTag names.SpaceTag
		if ok {
			spaceName := stateSpace.Name
			if !names.IsValidSpace(spaceName) {
				// Can only happen if an invalid name is stored
				// in state.
				logger.Errorf("space %q has an invalid name, ignoring", spaceName)
				continue

			}
			spaceTag = names.NewSpaceTag(spaceName)

		} else {
			// The space is new, we need to create a valid name for it
			// in state.
			spaceName := string(space.Name)
			// Convert the name into a valid name that isn't already in
			// use.
			spaceName = dw.config.NewName(spaceName, spaceNames)
			spaceNames.Add(spaceName)
			spaceTag = names.NewSpaceTag(spaceName)
			// We need to create the space.
			createSpacesArgs.Spaces = append(createSpacesArgs.Spaces, params.CreateSpaceParams{
				Public:     false,
				SpaceTag:   spaceTag.String(),
				ProviderId: string(space.ProviderId),
			})
		}
		// TODO(mfoord): currently no way of removing subnets, or
		// changing the space they're in, so we can only add ones we
		// don't already know about.
		for _, subnet := range space.Subnets {
			if stateSubnetIds.Contains(string(subnet.ProviderId)) {
				continue
			}
			zones := subnet.AvailabilityZones
			if len(zones) == 0 {
				logger.Tracef(
					"provider does not specify zones for subnet %q; using 'default' zone as fallback",
					subnet.CIDR,
				)
				zones = []string{"default"}
			}
			addSubnetsArgs.Subnets = append(addSubnetsArgs.Subnets, params.AddSubnetParams{
				SubnetProviderId: string(subnet.ProviderId),
				SpaceTag:         spaceTag.String(),
				Zones:            zones,
			})
		}
	}

	if err := dw.createSpacesFromArgs(createSpacesArgs); err != nil {
		return errors.Trace(err)
	}
//.........这里部分代码省略.........