Golang Conn.Read方法代碼示例

func read(client *Client, conn *tls.Conn) {
	buffer := make([]byte, ERR_RESPONSE_LEN)

	if _, err := conn.Read(buffer); err != nil {
		log.Printf("read err %v, %v, %p\n", err, err == io.EOF, client)
		client.chConnectionErr <- conn
		return
	}

	errRsp := &errResponse{
		Command: uint8(buffer[0]),
		Status:  uint8(buffer[1]),
	}

	if err := binary.Read(bytes.NewBuffer(buffer[2:]), binary.BigEndian, &errRsp.Identifier); err != nil {
		log.Println("read identifier err", err)
		return
	}

	if errRsp.Command != ERR_RESPONSE_CMD {
		log.Println("unknown err response", buffer)
		return
	}

	errMsg, ok := ApplePushResponses[errRsp.Status]
	if !ok {
		log.Println("unknown err status", buffer)
		return
	}

	log.Printf("get err response : %##v, %s\n", errRsp, errMsg)

	client.chErrResponse <- errRsp
}

func readConnection(conn *tls.Conn, readChannel chan []byte, errorChannel chan error) {
	for {
		data := make([]byte, 512)
		num, err := conn.Read(data)
		if err != nil {
			errorChannel <- err
			return
		}
		readChannel <- data[:num]
	}
}

func ReadPacket(logger *log.Logger, conn *tls.Conn) (*Packet, error) {

	inbuf := make([]byte, 1024)
	br, err := conn.Read(inbuf)
	if err != nil {
		return nil, err
	}
	if br == 0 {
		return nil, errors.New("disconnected")
	}
	if br < 4 {
		return nil, errors.New("short read")
	}

	br = br - 4
	phead := inbuf[0:4]
	b := bytes.NewReader(phead)

	var pilen uint32
	err = binary.Read(b, binary.BigEndian, &pilen)
	plen := int(pilen) - 4
	if err != nil {
		conn.Close()
		return nil, err
	}

	pdata := inbuf[4:]
	for {
		if br >= plen {
			break
		}
		buf := make([]byte, (plen - br))
		nr, err := conn.Read(buf)
		if err != nil {
			conn.Close()
			return nil, err
		}
		if nr == 0 {
			return nil, err
		}
		pdata = append(pdata, buf...)
		br = br + nr
	}

	var p Packet
	err = json.Unmarshal(pdata[:plen], &p)

	if err != nil {
		return nil, err

	}
	return &p, nil
}

func Publishv1(input chan []*FileEvent,
	registrar chan []*FileEvent,
	config *NetworkConfig) {
	var buffer bytes.Buffer
	var socket *tls.Conn
	var sequence uint32
	var err error

	socket = connect(config)
	defer socket.Close()

	for events := range input {
		buffer.Truncate(0)
		compressor, _ := zlib.NewWriterLevel(&buffer, 3)

		for _, event := range events {
			sequence += 1
			writeDataFrame(event, sequence, compressor)
		}
		compressor.Flush()
		compressor.Close()

		compressed_payload := buffer.Bytes()

		// Send buffer until we're successful...
		oops := func(err error) {
			// TODO(sissel): Track how frequently we timeout and reconnect. If we're
			// timing out too frequently, there's really no point in timing out since
			// basically everything is slow or down. We'll want to ratchet up the
			// timeout value slowly until things improve, then ratchet it down once
			// things seem healthy.
			log.Printf("Socket error, will reconnect: %s\n", err)
			time.Sleep(1 * time.Second)
			socket.Close()
			socket = connect(config)
		}

	SendPayload:
		for {
			// Abort if our whole request takes longer than the configured
			// network timeout.
			socket.SetDeadline(time.Now().Add(config.timeout))

			// Set the window size to the length of this payload in events.
			_, err = socket.Write([]byte("1W"))
			if err != nil {
				oops(err)
				continue
			}
			binary.Write(socket, binary.BigEndian, uint32(len(events)))
			if err != nil {
				oops(err)
				continue
			}

			// Write compressed frame
			socket.Write([]byte("1C"))
			if err != nil {
				oops(err)
				continue
			}
			binary.Write(socket, binary.BigEndian, uint32(len(compressed_payload)))
			if err != nil {
				oops(err)
				continue
			}
			_, err = socket.Write(compressed_payload)
			if err != nil {
				oops(err)
				continue
			}

			// read ack
			response := make([]byte, 0, 6)
			ackbytes := 0
			for ackbytes != 6 {
				n, err := socket.Read(response[len(response):cap(response)])
				if err != nil {
					log.Printf("Read error looking for ack: %s\n", err)
					socket.Close()
					socket = connect(config)
					continue SendPayload // retry sending on new connection
				} else {
					ackbytes += n
				}
			}

			// TODO(sissel): verify ack
			// Success, stop trying to send the payload.
			break
		}

		// Tell the registrar that we've successfully sent these events
		registrar <- events
	} /* for each event payload */
} // Publish

func readError(conn *tls.Conn, quit chan<- int, c chan<- NotificationError) {
	p := make([]byte, 6, 6)
	for {
		n, err := conn.Read(p)
		e := NewNotificationError(p[:n], err)
		c <- e
		if err != nil {
			quit <- 1
			return
		}
	}
}

func readError(client_conn *tls.Conn, c chan NotificationError) {
	var readb []byte
	readb = make([]byte, 6, 6)
	n, _ := client_conn.Read(readb)
	if n > 0 {
		notificationerror := NotificationError{}
		notificationerror.Command = uint8(readb[0])
		notificationerror.Status = uint8(readb[1])
		notificationerror.Identifier = uint32(readb[2])<<24 + uint32(readb[3])<<16 + uint32(readb[4])<<8 + uint32(readb[5])
		c <- notificationerror
	}
}

func readError(conn *tls.Conn, quit chan<- uint32, c chan<- error) {
	p := make([]byte, 6, 6)
	for {
		n, err := conn.Read(p)
		e := NewNotificationError(p[:n], err)
		fmt.Errorf("Read error in APNS : " + e.Error())
		if e.OtherError == nil {
			last_fail = e.Identifier
		}
		c <- e
		if err != nil {
			quit <- 1
			return
		}
	}
}

/**
* 監聽APNSSocket的返回結果，當有返回時，意味著發生錯誤了，這時把錯誤發到channel，同時關閉socket。
 */
func monitorConn(conn *tls.Conn, app string, sandbox bool) {
	defer CapturePanic(fmt.Sprint("panic when monitor Connection %s", app))
	defer conn.Close()
	reply := make([]byte, 6)
	n, err := conn.Read(reply)

	if err != nil && reply[0] != 8 {
		if strings.HasSuffix(err.Error(), "use of closed network connection") {
			log.Println("close the network connection")
			return
		} else {
			log.Printf("error when read from socket %s, %d", err, n)
		}
	}
	log.Printf("return %x, the id is %x", reply, reply[2:])
	buf := bytes.NewBuffer(reply[2:])
	var id int32
	binary.Read(buf, binary.BigEndian, &id)

	rsp := &APNSRespone{reply[0], reply[1], id, conn, app, sandbox}
	responseCN <- rsp
}

// GetValueFromContentsBlock returns the contents type in the header, as well as the contents contained within.
func GetValueFromContentsBlock(tlsConn *tls.Conn) (contents_type string, contents string, n int, err error) {
	buf := make([]byte, 512)
	n, err = tlsConn.Read(buf)
	if err != nil {
		if err.Error() == "EOF" {
			return "", "", 0, nil
		}
		return "", "", 0, err
	}

	begin_message := string(buf[0:n])
	if !(begin_message[:11] == "-----BEGIN " && begin_message[len(begin_message)-5:] == "-----") {
		error_text := fmt.Sprintf("The beginning string was invalid. It was %s", begin_message)
		return "", "", 0, errors.New(error_text)
	}

	contents_type = getContentsType(begin_message)
	end_message := getEndMessage(contents_type)
	contents = ""

	total_bytes := 0
	for {
		n, err := tlsConn.Read(buf)
		if err != nil && err.Error() != "EOF" {
			return "", "", 0, err
		}
		message := string(buf[0:n])
		if message == end_message {
			break
		}
		total_bytes += n
		contents += message
	}

	return contents_type, contents, total_bytes, nil
}

func ReadDataEncrypted(tlsConn *tls.Conn, private_key []byte) (metadata FileMetadata, contents string, operation_int int, err error) {
	buf := make([]byte, 512)
	n, err := tlsConn.Read(buf)
	if err != nil {
		if err.Error() == "EOF" {
			return FileMetadata{}, "", EOF_CONST, nil
		}
		return FileMetadata{}, "", ERR_CONST, err
	}

	begin_message := string(buf[0:n])
	if begin_message != getBeginMessage("DATA") {
		if begin_message == PING {
			return FileMetadata{}, "", PING_CONST, nil
		}
		error_text := fmt.Sprintf("The beginning DATA string was invalid. It was %s", begin_message)
		return FileMetadata{}, "", 0, errors.New(error_text)
	}

	n, err = tlsConn.Read(buf)
	if err != nil {
		if err.Error() == "EOF" {
			return FileMetadata{}, "", EOF_CONST, nil
		}
		return FileMetadata{}, "", ERR_CONST, err
	}
	begin_metadata_message := string(buf[0:n])
	if begin_metadata_message != getBeginMessage("METADATA") {
		error_text := fmt.Sprintf("The beginning METADATA string was invalid. It was %s", begin_metadata_message)
		return FileMetadata{}, "", ERR_CONST, errors.New(error_text)
	}

	operation_type, operation, n, err := GetValueFromContentsBlock(tlsConn)
	checkErr(err, tlsConn)
	err = checkDataFormatting(operation_type, "OPERATION", n)
	checkErr(err, tlsConn)

	path_type, path, n, err := GetValueFromContentsBlock(tlsConn)
	checkErr(err, tlsConn)
	err = checkDataFormatting(path_type, "PATH", n)
	checkErr(err, tlsConn)

	size_type, size, n, err := GetValueFromContentsBlock(tlsConn)
	checkErr(err, tlsConn)
	err = checkDataFormatting(size_type, "SIZE", n)
	checkErr(err, tlsConn)

	is_dir_type, is_dir, n, err := GetValueFromContentsBlock(tlsConn)
	checkErr(err, tlsConn)
	err = checkDataFormatting(is_dir_type, "IS_DIR", n)
	checkErr(err, tlsConn)

	modification_time_type, modification_time, n, err := GetValueFromContentsBlock(tlsConn)
	checkErr(err, tlsConn)
	err = checkDataFormatting(modification_time_type, "MODIFICATION_TIME", n)
	checkErr(err, tlsConn)

	n, err = tlsConn.Read(buf)
	if err != nil {
		if err.Error() == "EOF" {
			return FileMetadata{}, "", EOF_CONST, nil
		}
		return FileMetadata{}, "", ERR_CONST, err
	}

	end_metadata_message := string(buf[0:n])
	if end_metadata_message != getEndMessage("METADATA") {
		error_text := fmt.Sprintf("The ending string was invalid. It was %s", end_metadata_message)
		return FileMetadata{}, "", ERR_CONST, errors.New(error_text)
	}

	encrypted_contents_type, encrypted_contents, n, err := GetValueFromContentsBlock(tlsConn)
	checkErr(err, tlsConn)
	err = checkDataFormatting(encrypted_contents_type, "CONTENTS", n)
	checkErr(err, tlsConn)

	n, err = tlsConn.Read(buf)
	if err != nil {
		if err.Error() == "EOF" {
			return FileMetadata{}, "", EOF_CONST, nil
		}
		return FileMetadata{}, "", ERR_CONST, err
	}

	end_message := string(buf[0:n])
	if end_message != getEndMessage("DATA") {
		error_text := fmt.Sprintf("The ending string was invalid. It was %s", end_message)
		return FileMetadata{}, "", ERR_CONST, errors.New(error_text)
	}

	var is_dir_bool bool
	if is_dir == "1" {
		is_dir_bool = true
	} else if is_dir == "0" {
		is_dir_bool = false
	} else {
		return FileMetadata{}, "", ERR_CONST, errors.New("The value for IS_DIR was not valid.")
	}

	modification_time_int64, err := strconv.ParseInt(modification_time, 10, 64)
//.........這裏部分代碼省略.........

// ReadData reads from the conn and returns the metadata, contents, and intended operation of the data,
// according to the Gopherbox file transfer scheme.
func ReadData(tlsConn *tls.Conn) (metadata GBServerDatabase.FileMetadata, contents string, operation_int int, err error) {
	buf := make([]byte, 512)
	n, err := tlsConn.Read(buf)
	if err != nil {
		if err.Error() == "EOF" {
			return GBServerDatabase.FileMetadata{}, "", EOF_CONST, nil
		}
		return GBServerDatabase.FileMetadata{}, "", ERR_CONST, err
	}

	begin_message := string(buf[0:n])
	if begin_message != getBeginMessage("DATA") {
		if begin_message == PING {
			return GBServerDatabase.FileMetadata{}, "", PING_CONST, nil
		}
		error_text := fmt.Sprintf("The beginning DATA string was invalid. It was %s", begin_message)
		return GBServerDatabase.FileMetadata{}, "", 0, errors.New(error_text)
	}

	n, err = tlsConn.Read(buf)
	if err != nil {
		if err.Error() == "EOF" {
			return GBServerDatabase.FileMetadata{}, "", EOF_CONST, nil
		}
		return GBServerDatabase.FileMetadata{}, "", ERR_CONST, err
	}
	begin_metadata_message := string(buf[0:n])
	if begin_metadata_message != getBeginMessage("METADATA") {
		error_text := fmt.Sprintf("The beginning METADATA string was invalid. It was %s", begin_metadata_message)
		return GBServerDatabase.FileMetadata{}, "", ERR_CONST, errors.New(error_text)
	}

	operation_type, operation, n, err := GetValueFromContentsBlock(tlsConn)
	checkErr(err, tlsConn)
	err = checkDataFormatting(operation_type, "OPERATION", n)
	checkErr(err, tlsConn)

	path_type, path, n, err := GetValueFromContentsBlock(tlsConn)
	checkErr(err, tlsConn)
	err = checkDataFormatting(path_type, "PATH", n)
	checkErr(err, tlsConn)

	size_type, size, n, err := GetValueFromContentsBlock(tlsConn)
	checkErr(err, tlsConn)
	err = checkDataFormatting(size_type, "SIZE", n)
	checkErr(err, tlsConn)

	is_dir_type, is_dir, n, err := GetValueFromContentsBlock(tlsConn)
	checkErr(err, tlsConn)
	err = checkDataFormatting(is_dir_type, "IS_DIR", n)
	checkErr(err, tlsConn)

	modification_time_type, modification_time, n, err := GetValueFromContentsBlock(tlsConn)
	checkErr(err, tlsConn)
	err = checkDataFormatting(modification_time_type, "MODIFICATION_TIME", n)
	checkErr(err, tlsConn)

	n, err = tlsConn.Read(buf)
	if err != nil {
		if err.Error() == "EOF" {
			return GBServerDatabase.FileMetadata{}, "", EOF_CONST, nil
		}
		return GBServerDatabase.FileMetadata{}, "", ERR_CONST, err
	}

	end_metadata_message := string(buf[0:n])
	if end_metadata_message != getEndMessage("METADATA") {
		error_text := fmt.Sprintf("The ending string was invalid. It was %s", end_metadata_message)
		return GBServerDatabase.FileMetadata{}, "", ERR_CONST, errors.New(error_text)
	}

	contents_type, contents, n, err := GetValueFromContentsBlock(tlsConn)
	checkErr(err, tlsConn)
	err = checkDataFormatting(contents_type, "CONTENTS", n)
	checkErr(err, tlsConn)

	n, err = tlsConn.Read(buf)
	if err != nil {
		if err.Error() == "EOF" {
			return GBServerDatabase.FileMetadata{}, "", EOF_CONST, nil
		}
		return GBServerDatabase.FileMetadata{}, "", ERR_CONST, err
	}

	end_message := string(buf[0:n])
	if end_message != getEndMessage("DATA") {
		error_text := fmt.Sprintf("The ending string was invalid. It was %s", end_message)
		return GBServerDatabase.FileMetadata{}, "", ERR_CONST, errors.New(error_text)
	}

	var is_dir_bool bool
	if is_dir == "1" {
		is_dir_bool = true
	} else if is_dir == "0" {
		is_dir_bool = false
	} else {
		return GBServerDatabase.FileMetadata{}, "", ERR_CONST, errors.New("The value for IS_DIR was not valid.")
	}
//.........這裏部分代碼省略.........