func TestWriteTimeTag(t *testing.T) {
	tmpDir, _ := ioutil.TempDir("", "shard_test")
	defer os.RemoveAll(tmpDir)
	tmpShard := path.Join(tmpDir, "shard")
	tmpWal := path.Join(tmpDir, "wal")

	index := tsdb.NewDatabaseIndex("db")
	opts := tsdb.NewEngineOptions()
	opts.Config.WALDir = filepath.Join(tmpDir, "wal")

	sh := tsdb.NewShard(1, index, tmpShard, tmpWal, opts)
	if err := sh.Open(); err != nil {
		t.Fatalf("error opening shard: %s", err.Error())
	}
	defer sh.Close()

	pt := models.MustNewPoint(
		"cpu",
		models.NewTags(map[string]string{}),
		map[string]interface{}{"time": 1.0},
		time.Unix(1, 2),
	)

	buf := bytes.NewBuffer(nil)
	sh.WithLogger(zap.New(zap.NewTextEncoder(), zap.Output(zap.AddSync(buf))))
	if err := sh.WritePoints([]models.Point{pt}); err != nil {
		t.Fatalf("unexpected error: %v", err)
	} else if got, exp := buf.String(), "dropping field 'time'"; !strings.Contains(got, exp) {
		t.Fatalf("unexpected log message: %s", strings.TrimSpace(got))
	}

	m := index.Measurement("cpu")
	if m != nil {
		t.Fatal("unexpected cpu measurement")
	}

	pt = models.MustNewPoint(
		"cpu",
		models.NewTags(map[string]string{}),
		map[string]interface{}{"value": 1.0, "time": 1.0},
		time.Unix(1, 2),
	)

	buf = bytes.NewBuffer(nil)
	sh.WithLogger(zap.New(zap.NewTextEncoder(), zap.Output(zap.AddSync(buf))))
	if err := sh.WritePoints([]models.Point{pt}); err != nil {
		t.Fatalf("unexpected error: %v", err)
	} else if got, exp := buf.String(), "dropping field 'time'"; !strings.Contains(got, exp) {
		t.Fatalf("unexpected log message: %s", strings.TrimSpace(got))
	}

	m = index.Measurement("cpu")
	if m == nil {
		t.Fatal("expected cpu measurement")
	}

	if got, exp := len(m.FieldNames()), 1; got != exp {
		t.Fatalf("invalid number of field names: got=%v exp=%v", got, exp)
	}
}

// NewTestService returns a new instance of Service.
func NewTestService(database string, bind string) *TestService {
	s, err := NewService(Config{
		BindAddress:      bind,
		Database:         database,
		ConsistencyLevel: "one",
	})

	if err != nil {
		panic(err)
	}

	service := &TestService{
		Service:    s,
		MetaClient: &internal.MetaClientMock{},
	}

	service.MetaClient.CreateDatabaseFn = func(db string) (*meta.DatabaseInfo, error) {
		if got, exp := db, database; got != exp {
			return nil, fmt.Errorf("got %v, expected %v", got, exp)
		}
		return nil, nil
	}

	if testing.Verbose() {
		service.Service.WithLogger(zap.New(
			zap.NewTextEncoder(),
			zap.Output(os.Stderr),
		))
	}

	service.Service.MetaClient = service.MetaClient
	service.Service.PointsWriter = service
	return service
}

// NewService returns an instance of the Graphite service.
func NewService(c Config) (*Service, error) {
	// Use defaults where necessary.
	d := c.WithDefaults()

	s := Service{
		bindAddress:     d.BindAddress,
		database:        d.Database,
		retentionPolicy: d.RetentionPolicy,
		protocol:        d.Protocol,
		batchSize:       d.BatchSize,
		batchPending:    d.BatchPending,
		udpReadBuffer:   d.UDPReadBuffer,
		batchTimeout:    time.Duration(d.BatchTimeout),
		logger:          zap.New(zap.NullEncoder()),
		stats:           &Statistics{},
		defaultTags:     models.StatisticTags{"proto": d.Protocol, "bind": d.BindAddress},
		tcpConnections:  make(map[string]*tcpConnection),
		diagsKey:        strings.Join([]string{"graphite", d.Protocol, d.BindAddress}, ":"),
	}

	parser, err := NewParserWithOptions(Options{
		Templates:   d.Templates,
		DefaultTags: d.DefaultTags(),
		Separator:   d.Separator})

	if err != nil {
		return nil, err
	}
	s.parser = parser

	return &s, nil
}

// NewShard returns a new initialized Shard. walPath doesn't apply to the b1 type index
func NewShard(id uint64, index *DatabaseIndex, path string, walPath string, options EngineOptions) *Shard {
	db, rp := DecodeStorePath(path)
	logger := zap.New(zap.NullEncoder())
	s := &Shard{
		index:   index,
		id:      id,
		path:    path,
		walPath: walPath,
		options: options,
		closing: make(chan struct{}),

		stats: &ShardStatistics{},
		defaultTags: models.StatisticTags{
			"path":            path,
			"walPath":         walPath,
			"id":              fmt.Sprintf("%d", id),
			"database":        db,
			"retentionPolicy": rp,
			"engine":          options.EngineVersion,
		},

		database:        db,
		retentionPolicy: rp,

		logger:       logger,
		baseLogger:   logger,
		EnableOnOpen: true,
	}
	return s
}

// NewQueryExecutor returns a new instance of QueryExecutor.
func NewQueryExecutor() *QueryExecutor {
	return &QueryExecutor{
		TaskManager: NewTaskManager(),
		Logger:      zap.New(zap.NullEncoder()),
		stats:       &QueryStatistics{},
	}
}

// NewPointsWriter returns a new instance of PointsWriter for a node.
func NewPointsWriter() *PointsWriter {
	return &PointsWriter{
		closing:      make(chan struct{}),
		WriteTimeout: DefaultWriteTimeout,
		Logger:       zap.New(zap.NullEncoder()),
		stats:        &WriteStatistics{},
	}
}

// NewTaskManager creates a new TaskManager.
func NewTaskManager() *TaskManager {
	return &TaskManager{
		QueryTimeout: DefaultQueryTimeout,
		Logger:       zap.New(zap.NullEncoder()),
		queries:      make(map[uint64]*QueryTask),
		nextID:       1,
	}
}

// NewCommand return a new instance of Command.
func NewCommand() *Command {
	return &Command{
		closing: make(chan struct{}),
		Closed:  make(chan struct{}),
		Stdin:   os.Stdin,
		Stdout:  os.Stdout,
		Stderr:  os.Stderr,
		Logger:  zap.New(zap.NullEncoder()),
	}
}

// NewStore returns a new store with the given path and a default configuration.
// The returned store must be initialized by calling Open before using it.
func NewStore(path string) *Store {
	opts := NewEngineOptions()

	logger := zap.New(zap.NullEncoder())
	return &Store{
		path:          path,
		EngineOptions: opts,
		Logger:        logger,
		baseLogger:    logger,
	}
}

// NewMain return a new instance of Main.
func NewMain() *Main {
	return &Main{
		Logger: zap.New(
			zap.NewTextEncoder(),
			zap.Output(os.Stderr),
		),
		Stdin:  os.Stdin,
		Stdout: os.Stdout,
		Stderr: os.Stderr,
	}
}

// New returns a new instance of the monitor system.
func New(r Reporter, c Config) *Monitor {
	return &Monitor{
		globalTags:           make(map[string]string),
		diagRegistrations:    make(map[string]diagnostics.Client),
		reporter:             r,
		storeEnabled:         c.StoreEnabled,
		storeDatabase:        c.StoreDatabase,
		storeInterval:        time.Duration(c.StoreInterval),
		storeRetentionPolicy: MonitorRetentionPolicy,
		Logger:               zap.New(zap.NullEncoder()),
	}
}

func NewWAL(path string) *WAL {
	logger := zap.New(zap.NullEncoder())
	return &WAL{
		path: path,

		// these options should be overriden by any options in the config
		SegmentSize: DefaultSegmentSize,
		closing:     make(chan struct{}),
		stats:       &WALStatistics{},
		limiter:     limiter.NewFixed(defaultWaitingWALWrites),
		logger:      logger,
		traceLogger: logger,
	}
}

// NewClient returns a new *Client.
func NewClient(config *Config) *Client {
	return &Client{
		cacheData: &Data{
			ClusterID: uint64(rand.Int63()),
			Index:     1,
		},
		closing:             make(chan struct{}),
		changed:             make(chan struct{}),
		logger:              zap.New(zap.NullEncoder()),
		authCache:           make(map[string]authUser, 0),
		path:                config.Dir,
		retentionAutoCreate: config.RetentionAutoCreate,
	}
}

// NewHandler returns a new instance of handler with routes.
func NewHandler(c Config) *Handler {
	h := &Handler{
		mux:       pat.New(),
		Config:    &c,
		Logger:    zap.New(zap.NullEncoder()),
		CLFLogger: log.New(os.Stderr, "[httpd] ", 0),
		stats:     &Statistics{},
	}

	h.AddRoutes([]Route{
		Route{
			"query-options", // Satisfy CORS checks.
			"OPTIONS", "/query", false, true, h.serveOptions,
		},
		Route{
			"query", // Query serving route.
			"GET", "/query", true, true, h.serveQuery,
		},
		Route{
			"query", // Query serving route.
			"POST", "/query", true, true, h.serveQuery,
		},
		Route{
			"write-options", // Satisfy CORS checks.
			"OPTIONS", "/write", false, true, h.serveOptions,
		},
		Route{
			"write", // Data-ingest route.
			"POST", "/write", true, true, h.serveWrite,
		},
		Route{ // Ping
			"ping",
			"GET", "/ping", false, true, h.servePing,
		},
		Route{ // Ping
			"ping-head",
			"HEAD", "/ping", false, true, h.servePing,
		},
		Route{ // Ping w/ status
			"status",
			"GET", "/status", false, true, h.serveStatus,
		},
		Route{ // Ping w/ status
			"status-head",
			"HEAD", "/status", false, true, h.serveStatus,
		},
	}...)

	return h
}

func NewFileStore(dir string) *FileStore {
	logger := zap.New(zap.NullEncoder())
	fs := &FileStore{
		dir:          dir,
		lastModified: time.Time{},
		logger:       logger,
		traceLogger:  logger,
		stats:        &FileStoreStatistics{},
		purger: &purger{
			files:  map[string]TSMFile{},
			logger: logger,
		},
	}
	fs.purger.fileStore = fs
	return fs
}

// NewEngine returns a new instance of Engine.
func NewEngine(id uint64, path string, walPath string, opt tsdb.EngineOptions) tsdb.Engine {
	w := NewWAL(walPath)
	fs := NewFileStore(path)
	cache := NewCache(uint64(opt.Config.CacheMaxMemorySize), path)

	c := &Compactor{
		Dir:       path,
		FileStore: fs,
	}

	logger := zap.New(zap.NullEncoder())
	e := &Engine{
		id:           id,
		path:         path,
		logger:       logger,
		traceLogger:  logger,
		traceLogging: opt.Config.TraceLoggingEnabled,

		measurementFields: make(map[string]*tsdb.MeasurementFields),

		WAL:   w,
		Cache: cache,

		FileStore: fs,
		Compactor: c,
		CompactionPlan: &DefaultPlanner{
			FileStore:                    fs,
			CompactFullWriteColdDuration: time.Duration(opt.Config.CompactFullWriteColdDuration),
		},

		CacheFlushMemorySizeThreshold: opt.Config.CacheSnapshotMemorySize,
		CacheFlushWriteColdDuration:   time.Duration(opt.Config.CacheSnapshotWriteColdDuration),
		enableCompactionsOnOpen:       true,
		stats: &EngineStatistics{},
	}

	if e.traceLogging {
		fs.enableTraceLogging(true)
		w.enableTraceLogging(true)
	}

	return e
}

// NewQueryExecutor returns a new instance of QueryExecutor.
// This query executor always has a node id of 0.
func NewQueryExecutor() *QueryExecutor {
	e := &QueryExecutor{
		QueryExecutor: influxql.NewQueryExecutor(),
	}
	e.StatementExecutor = &coordinator.StatementExecutor{
		MetaClient: &e.MetaClient,
		TSDBStore:  &e.TSDBStore,
	}
	e.QueryExecutor.StatementExecutor = e.StatementExecutor

	var out io.Writer = &e.LogOutput
	if testing.Verbose() {
		out = io.MultiWriter(out, os.Stderr)
	}
	e.QueryExecutor.WithLogger(zap.New(
		zap.NewTextEncoder(),
		zap.Output(os.Stderr),
	))

	return e
}

func TestWriteTimeField(t *testing.T) {
	tmpDir, _ := ioutil.TempDir("", "shard_test")
	defer os.RemoveAll(tmpDir)
	tmpShard := path.Join(tmpDir, "shard")
	tmpWal := path.Join(tmpDir, "wal")

	index := tsdb.NewDatabaseIndex("db")
	opts := tsdb.NewEngineOptions()
	opts.Config.WALDir = filepath.Join(tmpDir, "wal")

	sh := tsdb.NewShard(1, index, tmpShard, tmpWal, opts)
	if err := sh.Open(); err != nil {
		t.Fatalf("error opening shard: %s", err.Error())
	}
	defer sh.Close()

	pt := models.MustNewPoint(
		"cpu",
		models.NewTags(map[string]string{"time": "now"}),
		map[string]interface{}{"value": 1.0},
		time.Unix(1, 2),
	)

	buf := bytes.NewBuffer(nil)
	sh.WithLogger(zap.New(zap.NewTextEncoder(), zap.Output(zap.AddSync(buf))))
	if err := sh.WritePoints([]models.Point{pt}); err != nil {
		t.Fatalf("unexpected error: %v", err)
	} else if got, exp := buf.String(), "dropping tag 'time'"; !strings.Contains(got, exp) {
		t.Fatalf("unexpected log message: %s", strings.TrimSpace(got))
	}

	key := models.MakeKey([]byte("cpu"), nil)
	series := index.Series(string(key))
	if series == nil {
		t.Fatal("expected series")
	} else if len(series.Tags) != 0 {
		t.Fatalf("unexpected number of tags: got=%v exp=%v", len(series.Tags), 0)
	}
}