Golang gollectd.TypesDBFile函數代碼示例

func (s *Server) ListenAndServe() {
	var err error

	s.getAuth()

	s.typesdb, err = collectd.TypesDBFile(s.typesdbpath)
	if err != nil {
		log.Error("CollectdServer: TypesDB: ", err)
		return
	}

	addr, err := net.ResolveUDPAddr("udp4", s.listenAddress)
	if err != nil {
		log.Error("CollectdServer: ResolveUDPAddr: ", err)
		return
	}

	if s.listenAddress != "" {
		s.conn, err = net.ListenUDP("udp", addr)
		if err != nil {
			log.Error("CollectdServer: Listen: ", err)
			return
		}
	}
	defer s.conn.Close()
	s.HandleSocket(s.conn)
}

func ListenAndServe(s *Server, iface string) error {
	if iface == "" { // Make sure we have an address
		return errors.New("bind address required")
	} else if s.Database == "" { // Make sure they have a database
		return errors.New("database was not specified in config")
	}

	addr, err := net.ResolveUDPAddr("udp", iface)
	if err != nil {
		return fmt.Errorf("unable to resolve UDP address: %v", err)
	}

	s.typesdb, err = gollectd.TypesDBFile(s.typesdbpath)
	if err != nil {
		return fmt.Errorf("unable to parse typesDBFile: %v", err)
	}

	conn, err := net.ListenUDP("udp", addr)
	if err != nil {
		return fmt.Errorf("unable to listen on UDP: %v", err)
	}
	s.conn = conn

	s.wg.Add(1)
	go s.serve(conn)

	return nil
}

// Open starts the service.
func (s *Service) Open() error {
	s.Logger.Printf("Starting collectd service")

	if s.Config.BindAddress == "" {
		return fmt.Errorf("bind address is blank")
	} else if s.Config.Database == "" {
		return fmt.Errorf("database name is blank")
	} else if s.PointsWriter == nil {
		return fmt.Errorf("PointsWriter is nil")
	}

	if err := s.MetaStore.WaitForLeader(leaderWaitTimeout); err != nil {
		s.Logger.Printf("Failed to detect a cluster leader: %s", err.Error())
		return err
	}

	if _, err := s.MetaStore.CreateDatabaseIfNotExists(s.Config.Database); err != nil {
		s.Logger.Printf("Failed to ensure target database %s exists: %s", s.Config.Database, err.Error())
		return err
	}

	if s.typesdb == nil {
		// Open collectd types.
		typesdb, err := gollectd.TypesDBFile(s.Config.TypesDB)
		if err != nil {
			return fmt.Errorf("Open(): %s", err)
		}
		s.typesdb = typesdb
	}

	// Resolve our address.
	addr, err := net.ResolveUDPAddr("udp", s.Config.BindAddress)
	if err != nil {
		return fmt.Errorf("unable to resolve UDP address: %s", err)
	}
	s.addr = addr

	// Start listening
	ln, err := net.ListenUDP("udp", addr)
	if err != nil {
		return fmt.Errorf("unable to listen on UDP: %s", err)
	}
	s.ln = ln

	s.Logger.Println("Listening on UDP: ", ln.LocalAddr().String())

	// Start the points batcher.
	s.batcher = tsdb.NewPointBatcher(s.Config.BatchSize, time.Duration(s.Config.BatchDuration))
	s.batcher.Start()

	// Create channel and wait group for signalling goroutines to stop.
	s.stop = make(chan struct{})
	s.wg.Add(2)

	// Start goroutines that process collectd packets.
	go s.serve()
	go s.writePoints()

	return nil
}

// Listen takes collectd network packets and breaks them into individual samples.
func Listen(config ListenConfig, c chan collectd.Packet) {
	// Initialise the error counts
	errorCounts.Add("fetch.receive", 0)

	laddr, err := net.ResolveUDPAddr("udp", config.Bind)
	if err != nil {
		log.Fatalln("[fatal] Listen: failed to resolve address", err)
	}

	conn, err := net.ListenUDP("udp", laddr)
	if err != nil {
		log.Fatalln("[fatal] Listen: failed to listen", err)
	}

	types, err := collectd.TypesDBFile(config.Typesdb)
	if err != nil {
		log.Fatalln("[fatal] Listen: failed to parse types.db", err)
	}

	for {
		// 1452 is collectd 5's default buffer size. See:
		// https://collectd.org/wiki/index.php/Binary_protocol
		buf := make([]byte, 1452)

		n, err := conn.Read(buf[:])
		if err != nil {
			log.Println("[error] Listen: Failed to receive packet", err)
			errorCounts.Add("fetch.receive", 1)
			continue
		}
		listenCounts.Add("raw", 1)

		packets, err := collectd.Packets(buf[0:n], types)
		for _, p := range *packets {
			listenCounts.Add("decoded", 1)
			c <- p
		}
	}
}

// Listen for collectd network packets, parse , and send them over a channel
func Listen(addr string, c chan collectd.Packet, typesdb string) {
	laddr, err := net.ResolveUDPAddr("udp", addr)
	if err != nil {
		log.Fatalln("fatal: failed to resolve address", err)
	}

	conn, err := net.ListenUDP("udp", laddr)
	if err != nil {
		log.Fatalln("fatal: failed to listen", err)
	}

	types, err := collectd.TypesDBFile(typesdb)
	if err != nil {
		log.Fatalln("fatal: failed to parse types.db", err)
	}

	for {
		// 1452 is collectd 5's default buffer size. See:
		// https://collectd.org/wiki/index.php/Binary_protocol
		buf := make([]byte, 1452)

		n, err := conn.Read(buf[:])
		if err != nil {
			log.Println("error: Failed to receive packet", err)
			continue
		}

		packets, err := collectd.Packets(buf[0:n], types)
		if err != nil {
			log.Println("error: Failed to receive packet", err)
			continue
		}

		for _, p := range *packets {
			c <- p
		}
	}
}

func main() {
	typesPath := flag.String("typesdb", "", "Path to types.db")
	flag.Parse()

	if *typesPath == "" {
		flag.Usage()
		os.Exit(1)
	}

	types, err := collectd.TypesDBFile(*typesPath)

	if err != nil {
		fmt.Printf("%s\n", err)
		os.Exit(1)
	}

	for k, pv := range types {
		fmt.Printf("%s:\n", k)
		for _, v := range pv {
			fmt.Printf("\t%+v\n", *v)
		}
	}
}

// Open starts the service.
func (s *Service) Open() error {
	s.Logger.Printf("Starting collectd service")

	// Configure expvar monitoring. It's OK to do this even if the service fails to open and
	// should be done before any data could arrive for the service.
	key := strings.Join([]string{"collectd", s.Config.BindAddress}, ":")
	tags := map[string]string{"bind": s.Config.BindAddress}
	s.statMap = influxdb.NewStatistics(key, "collectd", tags)

	if s.Config.BindAddress == "" {
		return fmt.Errorf("bind address is blank")
	} else if s.Config.Database == "" {
		return fmt.Errorf("database name is blank")
	} else if s.PointsWriter == nil {
		return fmt.Errorf("PointsWriter is nil")
	}

	if err := s.MetaStore.WaitForLeader(leaderWaitTimeout); err != nil {
		s.Logger.Printf("Failed to detect a cluster leader: %s", err.Error())
		return err
	}

	if _, err := s.MetaStore.CreateDatabaseIfNotExists(s.Config.Database); err != nil {
		s.Logger.Printf("Failed to ensure target database %s exists: %s", s.Config.Database, err.Error())
		return err
	}

	if s.typesdb == nil {
		// Open collectd types.
		typesdb, err := gollectd.TypesDBFile(s.Config.TypesDB)
		if err != nil {
			return fmt.Errorf("Open(): %s", err)
		}
		s.typesdb = typesdb
	}

	// Resolve our address.
	addr, err := net.ResolveUDPAddr("udp", s.Config.BindAddress)
	if err != nil {
		return fmt.Errorf("unable to resolve UDP address: %s", err)
	}
	s.addr = addr

	// Start listening
	ln, err := net.ListenUDP("udp", addr)
	if err != nil {
		return fmt.Errorf("unable to listen on UDP: %s", err)
	}
	s.ln = ln

	s.Logger.Println("Listening on UDP: ", ln.LocalAddr().String())

	// Start the points batcher.
	s.batcher = tsdb.NewPointBatcher(s.Config.BatchSize, s.Config.BatchPending, time.Duration(s.Config.BatchDuration))
	s.batcher.Start()

	// Create channel and wait group for signalling goroutines to stop.
	s.stop = make(chan struct{})
	s.wg.Add(2)

	// Start goroutines that process collectd packets.
	go s.serve()
	go s.writePoints()

	return nil
}

// Open starts the service.
func (s *Service) Open() error {
	s.mu.Lock()
	defer s.mu.Unlock()

	if !s.closed() {
		return nil // Already open.
	}
	s.done = make(chan struct{})

	s.Logger.Printf("Starting collectd service")

	if s.Config.BindAddress == "" {
		return fmt.Errorf("bind address is blank")
	} else if s.Config.Database == "" {
		return fmt.Errorf("database name is blank")
	} else if s.PointsWriter == nil {
		return fmt.Errorf("PointsWriter is nil")
	}

	if s.typesdb == nil {
		// Open collectd types.
		if stat, err := os.Stat(s.Config.TypesDB); err != nil {
			return fmt.Errorf("Stat(): %s", err)
		} else if stat.IsDir() {
			alltypesdb := make(gollectd.Types)
			var readdir func(path string)
			readdir = func(path string) {
				files, err := ioutil.ReadDir(path)
				if err != nil {
					s.Logger.Printf("Unable to read directory %s: %s\n", path, err)
					return
				}

				for _, f := range files {
					fullpath := filepath.Join(path, f.Name())
					if f.IsDir() {
						readdir(fullpath)
						continue
					}

					s.Logger.Printf("Loading %s\n", fullpath)
					types, err := gollectd.TypesDBFile(fullpath)
					if err != nil {
						s.Logger.Printf("Unable to parse collectd types file: %s\n", f.Name())
						continue
					}

					for k, t := range types {
						a, ok := alltypesdb[k]
						if ok {
							alltypesdb[k] = t
						} else {
							alltypesdb[k] = append(a, t...)
						}
					}
				}
			}
			readdir(s.Config.TypesDB)
			s.typesdb = alltypesdb
		} else {
			s.Logger.Printf("Loading %s\n", s.Config.TypesDB)
			typesdb, err := gollectd.TypesDBFile(s.Config.TypesDB)
			if err != nil {
				return fmt.Errorf("Open(): %s", err)
			}
			s.typesdb = typesdb
		}
	}
	// Resolve our address.
	addr, err := net.ResolveUDPAddr("udp", s.Config.BindAddress)
	if err != nil {
		return fmt.Errorf("unable to resolve UDP address: %s", err)
	}
	s.addr = addr

	// Start listening
	conn, err := net.ListenUDP("udp", addr)
	if err != nil {
		return fmt.Errorf("unable to listen on UDP: %s", err)
	}

	if s.Config.ReadBuffer != 0 {
		err = conn.SetReadBuffer(s.Config.ReadBuffer)
		if err != nil {
			return fmt.Errorf("unable to set UDP read buffer to %d: %s",
				s.Config.ReadBuffer, err)
		}
	}
	s.conn = conn

	s.Logger.Println("Listening on UDP: ", conn.LocalAddr().String())

	// Start the points batcher.
	s.batcher = tsdb.NewPointBatcher(s.Config.BatchSize, s.Config.BatchPending, time.Duration(s.Config.BatchDuration))
	s.batcher.Start()

	// Create waitgroup for signalling goroutines to stop and start goroutines
	// that process collectd packets.
	s.wg.Add(2)
//.........這裏部分代碼省略.........