func TestService_WaitForDataChanged(t *testing.T) {
	dataChanged := make(chan bool)
	ms := MetaStore{}
	ms.WaitForDataChangedFn = func() error {
		<-dataChanged
		return nil
	}
	calls := make(chan bool, 2)
	ms.DatabasesFn = func() ([]meta.DatabaseInfo, error) {
		calls <- true
		return nil, nil
	}

	s := subscriber.NewService(subscriber.NewConfig())
	s.MetaStore = ms
	// Explicitly closed below for testing
	s.Open()

	// Should be called once during open
	select {
	case <-calls:
	case <-time.After(10 * time.Millisecond):
		t.Fatal("expected call")
	}

	select {
	case <-calls:
		t.Fatal("unexpected call")
	case <-time.After(time.Millisecond):
	}

	// Signal that data has changed
	dataChanged <- true

	// Should be called once more after data changed
	select {
	case <-calls:
	case <-time.After(10 * time.Millisecond):
		t.Fatal("expected call")
	}

	select {
	case <-calls:
		t.Fatal("unexpected call")
	case <-time.After(time.Millisecond):
	}

	//Close service ensure not called
	s.Close()
	dataChanged <- true
	select {
	case <-calls:
		t.Fatal("unexpected call")
	case <-time.After(time.Millisecond):
	}

	close(dataChanged)
}

func TestService_IgnoreNonMatch(t *testing.T) {
	dataChanged := make(chan struct{})
	ms := MetaClient{}
	ms.WaitForDataChangedFn = func() chan struct{} {
		return dataChanged
	}
	ms.DatabasesFn = func() ([]meta.DatabaseInfo, error) {
		return []meta.DatabaseInfo{
			{
				Name: "db0",
				RetentionPolicies: []meta.RetentionPolicyInfo{
					{
						Name: "rp0",
						Subscriptions: []meta.SubscriptionInfo{
							{Name: "s0", Mode: "ANY", Destinations: []string{"udp://h0:9093", "udp://h1:9093"}},
						},
					},
				},
			},
		}, nil
	}

	prs := make(chan *cluster.WritePointsRequest, 2)
	urls := make(chan url.URL, 2)
	newPointsWriter := func(u url.URL) (subscriber.PointsWriter, error) {
		sub := Subscription{}
		sub.WritePointsFn = func(p *cluster.WritePointsRequest) error {
			prs <- p
			return nil
		}
		urls <- u
		return sub, nil
	}

	s := subscriber.NewService(subscriber.NewConfig())
	s.MetaClient = ms
	s.NewPointsWriter = newPointsWriter
	s.Open()
	defer s.Close()

	// Signal that data has changed
	dataChanged <- struct{}{}

	for _, expURLStr := range []string{"udp://h0:9093", "udp://h1:9093"} {
		var u url.URL
		expURL, _ := url.Parse(expURLStr)
		select {
		case u = <-urls:
		case <-time.After(10 * time.Millisecond):
			t.Fatal("expected urls")
		}
		if expURL.String() != u.String() {
			t.Fatalf("unexpected url: got %s exp %s", u.String(), expURL.String())
		}
	}

	// Write points that don't match any subscription.
	s.Points() <- &cluster.WritePointsRequest{
		Database:        "db1",
		RetentionPolicy: "rp0",
	}
	s.Points() <- &cluster.WritePointsRequest{
		Database:        "db0",
		RetentionPolicy: "rp2",
	}

	// Shouldn't get any prs back
	select {
	case pr := <-prs:
		t.Fatalf("unexpected points request %v", pr)
	default:
	}
	close(dataChanged)
}

func TestService_Multiple(t *testing.T) {
	dataChanged := make(chan struct{})
	ms := MetaClient{}
	ms.WaitForDataChangedFn = func() chan struct{} {
		return dataChanged
	}
	ms.DatabasesFn = func() ([]meta.DatabaseInfo, error) {
		return []meta.DatabaseInfo{
			{
				Name: "db0",
				RetentionPolicies: []meta.RetentionPolicyInfo{
					{
						Name: "rp0",
						Subscriptions: []meta.SubscriptionInfo{
							{Name: "s0", Mode: "ANY", Destinations: []string{"udp://h0:9093", "udp://h1:9093"}},
						},
					},
					{
						Name: "rp1",
						Subscriptions: []meta.SubscriptionInfo{
							{Name: "s1", Mode: "ALL", Destinations: []string{"udp://h2:9093", "udp://h3:9093"}},
						},
					},
				},
			},
		}, nil
	}

	prs := make(chan *cluster.WritePointsRequest, 4)
	urls := make(chan url.URL, 4)
	newPointsWriter := func(u url.URL) (subscriber.PointsWriter, error) {
		sub := Subscription{}
		sub.WritePointsFn = func(p *cluster.WritePointsRequest) error {
			prs <- p
			return nil
		}
		urls <- u
		return sub, nil
	}

	s := subscriber.NewService(subscriber.NewConfig())
	s.MetaClient = ms
	s.NewPointsWriter = newPointsWriter
	s.Open()
	defer s.Close()

	// Signal that data has changed
	dataChanged <- struct{}{}

	for _, expURLStr := range []string{"udp://h0:9093", "udp://h1:9093", "udp://h2:9093", "udp://h3:9093"} {
		var u url.URL
		expURL, _ := url.Parse(expURLStr)
		select {
		case u = <-urls:
		case <-time.After(10 * time.Millisecond):
			t.Fatal("expected urls")
		}
		if expURL.String() != u.String() {
			t.Fatalf("unexpected url: got %s exp %s", u.String(), expURL.String())
		}
	}

	// Write points that don't match any subscription.
	s.Points() <- &cluster.WritePointsRequest{
		Database:        "db1",
		RetentionPolicy: "rp0",
	}
	s.Points() <- &cluster.WritePointsRequest{
		Database:        "db0",
		RetentionPolicy: "rp2",
	}

	// Write points that match subscription with mode ANY
	expPR := &cluster.WritePointsRequest{
		Database:        "db0",
		RetentionPolicy: "rp0",
	}
	s.Points() <- expPR

	// Validate we get the pr back just once
	var pr *cluster.WritePointsRequest
	select {
	case pr = <-prs:
	case <-time.After(10 * time.Millisecond):
		t.Fatal("expected points request")
	}
	if pr != expPR {
		t.Errorf("unexpected points request: got %v, exp %v", pr, expPR)
	}

	// shouldn't get it a second time
	select {
	case pr = <-prs:
		t.Fatalf("unexpected points request %v", pr)
	default:
	}

	// Write points that match subscription with mode ALL
	expPR = &cluster.WritePointsRequest{
		Database:        "db0",
//.........这里部分代码省略.........

// NewServer returns a new instance of Server built from a config.
func NewServer(c *Config, buildInfo *BuildInfo) (*Server, error) {
	// We need to ensure that a meta directory always exists even if
	// we don't start the meta store.  node.json is always stored under
	// the meta directory.
	if err := os.MkdirAll(c.Meta.Dir, 0777); err != nil {
		return nil, fmt.Errorf("mkdir all: %s", err)
	}

	// 0.10-rc1 and prior would sometimes put the node.json at the root
	// dir which breaks backup/restore and restarting nodes.  This moves
	// the file from the root so it's always under the meta dir.
	oldPath := filepath.Join(filepath.Dir(c.Meta.Dir), "node.json")
	newPath := filepath.Join(c.Meta.Dir, "node.json")

	if _, err := os.Stat(oldPath); err == nil {
		if err := os.Rename(oldPath, newPath); err != nil {
			return nil, err
		}
	}

	// load the node information
	metaAddresses := []string{c.Meta.HTTPBindAddress}
	if !c.Meta.Enabled {
		metaAddresses = c.Meta.JoinPeers
	}

	node, err := influxdb.LoadNode(c.Meta.Dir, metaAddresses)
	if err != nil {
		if !os.IsNotExist(err) {
			return nil, err
		} else {
			node = influxdb.NewNode(c.Meta.Dir, metaAddresses)
		}
	}

	// In 0.10.0 bind-address got moved to the top level. Check
	// The old location to keep things backwards compatible
	bind := c.BindAddress
	if c.Meta.BindAddress != "" {
		bind = c.Meta.BindAddress
	}

	if !c.Data.Enabled && !c.Meta.Enabled {
		return nil, fmt.Errorf("must run as either meta node or data node or both")
	}

	httpBindAddress, err := defaultHost(DefaultHostname, c.HTTPD.BindAddress)
	if err != nil {
		return nil, err
	}
	tcpBindAddress, err := defaultHost(DefaultHostname, bind)
	if err != nil {
		return nil, err
	}

	s := &Server{
		buildInfo: *buildInfo,
		err:       make(chan error),
		closing:   make(chan struct{}),

		BindAddress: bind,

		Node: node,

		Monitor: monitor.New(c.Monitor),

		reportingDisabled: c.ReportingDisabled,
		joinPeers:         c.Meta.JoinPeers,
		metaUseTLS:        c.Meta.HTTPSEnabled,

		httpAPIAddr: httpBindAddress,
		httpUseTLS:  c.HTTPD.HTTPSEnabled,
		tcpAddr:     tcpBindAddress,

		config: c,
	}

	if c.Meta.Enabled {
		s.MetaService = meta.NewService(c.Meta)
	}

	if c.Data.Enabled {
		s.TSDBStore = tsdb.NewStore(c.Data.Dir)
		s.TSDBStore.EngineOptions.Config = c.Data

		// Copy TSDB configuration.
		s.TSDBStore.EngineOptions.EngineVersion = c.Data.Engine
		s.TSDBStore.EngineOptions.MaxWALSize = c.Data.MaxWALSize
		s.TSDBStore.EngineOptions.WALFlushInterval = time.Duration(c.Data.WALFlushInterval)
		s.TSDBStore.EngineOptions.WALPartitionFlushDelay = time.Duration(c.Data.WALPartitionFlushDelay)

		// Set the shard mapper
		s.ShardMapper = cluster.NewShardMapper(time.Duration(c.Cluster.ShardMapperTimeout))
		s.ShardMapper.ForceRemoteMapping = c.Cluster.ForceRemoteShardMapping
		s.ShardMapper.TSDBStore = s.TSDBStore
		s.ShardMapper.Node = node

		// Initialize query executor.
		s.QueryExecutor = tsdb.NewQueryExecutor(s.TSDBStore)
//.........这里部分代码省略.........

// NewServer returns a new instance of Server built from a config.
func NewServer(c *Config, buildInfo *BuildInfo) (*Server, error) {
	// load the node information. Before 0.10 this was in the meta directory,
	// so use that if the top level directory isn't specified
	dir := c.Dir
	if dir == "" {
		dir = c.Meta.Dir
	}

	// load the node information
	node, err := influxdb.LoadNode(dir, c.Meta.HTTPBindAddress)
	if err != nil {
		if !os.IsNotExist(err) {
			return nil, err
		} else {
			node = influxdb.NewNode(dir, c.Meta.HTTPBindAddress)
		}
	}

	// In 0.10.0 bind-address got moved to the top level. Check
	// The old location to keep things backwards compatible
	bind := c.BindAddress
	if c.Meta.BindAddress != "" {
		bind = c.Meta.BindAddress
	}

	if !c.Data.Enabled && !c.Meta.Enabled {
		return nil, fmt.Errorf("must run as either meta node or data node or both")
	}

	httpBindAddress, err := defaultHost(DefaultHostname, c.HTTPD.BindAddress)
	if err != nil {
		return nil, err
	}
	tcpBindAddress, err := defaultHost(DefaultHostname, bind)
	if err != nil {
		return nil, err
	}

	s := &Server{
		buildInfo: *buildInfo,
		err:       make(chan error),
		closing:   make(chan struct{}),

		BindAddress: bind,

		Node: node,

		Monitor: monitor.New(c.Monitor),

		reportingDisabled: c.ReportingDisabled,
		joinPeers:         c.Meta.JoinPeers,
		metaUseTLS:        c.Meta.HTTPSEnabled,

		httpAPIAddr: httpBindAddress,
		httpUseTLS:  c.HTTPD.HTTPSEnabled,
		tcpAddr:     tcpBindAddress,

		config: c,
	}

	if c.Meta.Enabled {
		s.MetaService = meta.NewService(c.Meta)
	}

	if c.Data.Enabled {
		s.TSDBStore = tsdb.NewStore(c.Data.Dir)
		s.TSDBStore.EngineOptions.Config = c.Data

		// Copy TSDB configuration.
		s.TSDBStore.EngineOptions.EngineVersion = c.Data.Engine
		s.TSDBStore.EngineOptions.MaxWALSize = c.Data.MaxWALSize
		s.TSDBStore.EngineOptions.WALFlushInterval = time.Duration(c.Data.WALFlushInterval)
		s.TSDBStore.EngineOptions.WALPartitionFlushDelay = time.Duration(c.Data.WALPartitionFlushDelay)

		// Set the shard mapper
		s.ShardMapper = cluster.NewShardMapper(time.Duration(c.Cluster.ShardMapperTimeout))
		s.ShardMapper.ForceRemoteMapping = c.Cluster.ForceRemoteShardMapping
		s.ShardMapper.TSDBStore = s.TSDBStore
		s.ShardMapper.Node = node

		// Initialize query executor.
		s.QueryExecutor = tsdb.NewQueryExecutor(s.TSDBStore)
		s.QueryExecutor.MonitorStatementExecutor = &monitor.StatementExecutor{Monitor: s.Monitor}
		s.QueryExecutor.ShardMapper = s.ShardMapper
		s.QueryExecutor.QueryLogEnabled = c.Data.QueryLogEnabled

		// Set the shard writer
		s.ShardWriter = cluster.NewShardWriter(time.Duration(c.Cluster.ShardWriterTimeout),
			c.Cluster.MaxRemoteWriteConnections)

		// Create the hinted handoff service
		s.HintedHandoff = hh.NewService(c.HintedHandoff, s.ShardWriter, s.MetaClient)
		s.HintedHandoff.Monitor = s.Monitor

		// Create the Subscriber service
		s.Subscriber = subscriber.NewService(c.Subscriber)

		// Initialize points writer.
		s.PointsWriter = cluster.NewPointsWriter()
//.........这里部分代码省略.........

// NewServer returns a new instance of Server built from a config.
func NewServer(c *Config, buildInfo *BuildInfo) (*Server, error) {
	// Construct base meta store and data store.
	tsdbStore := tsdb.NewStore(c.Data.Dir)
	tsdbStore.EngineOptions.Config = c.Data

	s := &Server{
		buildInfo: *buildInfo,
		err:       make(chan error),
		closing:   make(chan struct{}),

		Hostname:    c.Meta.Hostname,
		BindAddress: c.Meta.BindAddress,

		MetaStore: meta.NewStore(c.Meta),
		TSDBStore: tsdbStore,

		Monitor: monitor.New(c.Monitor),

		reportingDisabled: c.ReportingDisabled,
	}

	// Copy TSDB configuration.
	s.TSDBStore.EngineOptions.EngineVersion = c.Data.Engine
	s.TSDBStore.EngineOptions.MaxWALSize = c.Data.MaxWALSize
	s.TSDBStore.EngineOptions.WALFlushInterval = time.Duration(c.Data.WALFlushInterval)
	s.TSDBStore.EngineOptions.WALPartitionFlushDelay = time.Duration(c.Data.WALPartitionFlushDelay)

	// Set the shard mapper
	s.ShardMapper = cluster.NewShardMapper(time.Duration(c.Cluster.ShardMapperTimeout))
	s.ShardMapper.ForceRemoteMapping = c.Cluster.ForceRemoteShardMapping
	s.ShardMapper.MetaStore = s.MetaStore
	s.ShardMapper.TSDBStore = s.TSDBStore

	// Initialize query executor.
	s.QueryExecutor = tsdb.NewQueryExecutor(s.TSDBStore)
	s.QueryExecutor.MetaStore = s.MetaStore
	s.QueryExecutor.MetaStatementExecutor = &meta.StatementExecutor{Store: s.MetaStore}
	s.QueryExecutor.MonitorStatementExecutor = &monitor.StatementExecutor{Monitor: s.Monitor}
	s.QueryExecutor.ShardMapper = s.ShardMapper
	s.QueryExecutor.QueryLogEnabled = c.Data.QueryLogEnabled

	// Set the shard writer
	s.ShardWriter = cluster.NewShardWriter(time.Duration(c.Cluster.ShardWriterTimeout))
	s.ShardWriter.MetaStore = s.MetaStore

	// Create the hinted handoff service
	s.HintedHandoff = hh.NewService(c.HintedHandoff, s.ShardWriter, s.MetaStore)
	s.HintedHandoff.Monitor = s.Monitor

	// Create the Subscriber service
	s.Subscriber = subscriber.NewService(c.Subscriber)
	s.Subscriber.MetaStore = s.MetaStore

	// Initialize points writer.
	s.PointsWriter = cluster.NewPointsWriter()
	s.PointsWriter.WriteTimeout = time.Duration(c.Cluster.WriteTimeout)
	s.PointsWriter.MetaStore = s.MetaStore
	s.PointsWriter.TSDBStore = s.TSDBStore
	s.PointsWriter.ShardWriter = s.ShardWriter
	s.PointsWriter.HintedHandoff = s.HintedHandoff
	s.PointsWriter.Subscriber = s.Subscriber

	// needed for executing INTO queries.
	s.QueryExecutor.IntoWriter = s.PointsWriter

	// Initialize the monitor
	s.Monitor.Version = s.buildInfo.Version
	s.Monitor.Commit = s.buildInfo.Commit
	s.Monitor.Branch = s.buildInfo.Branch
	s.Monitor.BuildTime = s.buildInfo.Time
	s.Monitor.MetaStore = s.MetaStore
	s.Monitor.PointsWriter = s.PointsWriter

	// Append services.
	s.appendClusterService(c.Cluster)
	s.appendPrecreatorService(c.Precreator)
	s.appendRegistrationService(c.Registration)
	s.appendSnapshotterService()
	s.appendCopierService()
	s.appendAdminService(c.Admin)
	s.appendContinuousQueryService(c.ContinuousQuery)
	s.appendHTTPDService(c.HTTPD)
	s.appendCollectdService(c.Collectd)
	if err := s.appendOpenTSDBService(c.OpenTSDB); err != nil {
		return nil, err
	}
	for _, g := range c.UDPs {
		s.appendUDPService(g)
	}
	s.appendRetentionPolicyService(c.Retention)
	for _, g := range c.Graphites {
		if err := s.appendGraphiteService(g); err != nil {
			return nil, err
		}
	}

	return s, nil
}