class _SocketClient(QObject):
"""Keeps socket in separate thread.
Outgoing signals:
- disconnected (device_id: int): Client disconnected.
- connected (device_id: int, ip: str, port: int): Client connected.
- message (device_id: int, message: bytes): Message from client.
- error (device_id: int, error: str): Error occured.
- closed (): Closed successfully.
Incomming signals:
- close_signal (): Emit to close connection.
- write (device_id: int, message: bytes): Emit to send message
to client with ID in this thread.
"""
disconnected = Signal(int)
connected = Signal(int, str, int)
message = Signal(int, bytes)
error = Signal(int, str)
closed = Signal()
close_signal = Signal()
write = Signal(bytes)
def __init__(self, socket_descriptor, client_id):
super(_SocketClient, self).__init__(None)
self.socket_descriptor = socket_descriptor
self.id = int(client_id)
@Slot()
def run(self) -> None:
"""Run socket manager."""
self._logger = logging.getLogger(self.__class__.__name__) # noqa
self.data = {"size_left": 0, "data": b""} # noqa
self.socket = QTcpSocket() # noqa
self.socket.setParent(None) # noqa
self.socket.setSocketOption(QAbstractSocket.KeepAliveOption, 1)
if self.socket.setSocketDescriptor(self.socket_descriptor): # noqa
self.socket.readyRead.connect(self.on_message) # noqa
self.socket.disconnected.connect(self.on_disconnected) # noqa
self.socket.error.connect(self.on_error) # noqa
self._logger.debug("CLIENT-{} connected to {}:{}".format(self.get_id(),
self.socket.peerAddress().toString(),
self.socket.peerPort()))
self.connected.emit(self.get_id(), self.socket.peerAddress().toString(), self.socket.peerPort())
self.close_signal.connect(self.close, Qt.BlockingQueuedConnection)
self.write.connect(self._write)
@Slot()
def get_id(self) -> int:
"""Get ID of client."""
return self.id
@Slot(bytes)
def _write(self, message: bytes):
"""Send task to client.
Args:
message (bytes): Message to send.
"""
if self.socket:
message = struct.pack('!L', len(message)) + message
self.socket.write(message)
self.socket.flush()
else:
self._logger.warning("Socket not created.")
@Slot()
def on_message(self):
"""Handle socket messages.
Note:
Emits message signal.
"""
while self.socket.bytesAvailable():
size_left = self.data.get("size_left")
if size_left > 0:
message = self.socket.read(size_left)
size_left = size_left - len(message)
if size_left > 0:
self.data["size_left"] = size_left
self.data["data"] += message
else:
message = self.data.get("data") + message
self.data["size_left"] = 0
self.data["data"] = b""
self.message.emit(self.get_id(), message)
else:
header_size = struct.calcsize('!L')
header = self.socket.read(header_size)
if len(header) == 4:
msg_size = struct.unpack('!L', header)[0]
message = self.socket.read(msg_size)
if len(message) < msg_size:
msg_size = msg_size - len(message)
self.data["data"] = message
self.data["size_left"] = msg_size
else:
self.message.emit(self.get_id(), message)
@Slot()
def on_disconnected(self):
"""Handle disconnecting socket.
Note:
Emits disconnected signal.
"""
if self.socket:
try:
self._logger.info("CLIENT-{} Disconnected {}: {}:{}".format(self.get_id(), self.socket.peerName(),
self.socket.peerAddress().toString(),
self.socket.peerPort()))
self.socket.close()
self.disconnected.emit(self.get_id())
except RuntimeError:
pass
@Slot()
def on_error(self):
"""Handle socket errors
Note:
Emits error signal.
"""
e = self.socket.errorString()
self._logger.error("CLIENT-{} Error: {}".format(self.get_id(), e))
self.error.emit(self.get_id(), str(e))
@Slot()
def close(self):
"""Close connection.
Note:
Emits closed signal.
"""
self.socket.close()
self.socket.deleteLater()
self.closed.emit()
class _SocketClient(QObject):
closed = Signal()
connected = Signal(str, int)
message = Signal(bytes)
disconnected = Signal()
error = Signal(str)
failed_to_connect = Signal(str, int)
close_signal = Signal()
write_signal = Signal(bytes)
reconnect_signal = Signal()
connect_signal = Signal(str, int)
disconnect_signal = Signal()
def __init__(self, ip: str, port: int, loggerName=None):
super(_SocketClient, self).__init__(None)
self.ip = ip
self.port = port
self.logger_name = loggerName
@Slot()
def start(self):
if self.logger_name:
self.logger = logging.getLogger(self.logger_name) # noqa
else:
self.logger = logging.getLogger(self.__class__.__name__) # noqa
self.data = {"size_left": 0, "data": b""} # noqa
self.tcpSocket = QTcpSocket(self) # noqa
self.tcpSocket.setObjectName("qclient_socket")
QMetaObject.connectSlotsByName(self)
self.tcpSocket.setSocketOption(QAbstractSocket.KeepAliveOption, 1)
self.tcpSocket.connectToHost(QHostAddress(self.ip), self.port,
QIODevice.ReadWrite)
if not self.tcpSocket.waitForConnected(3000):
self.failed_to_connect.emit(self.ip, self.port)
self.tcpSocket.disconnectFromHost()
self.tcpSocket.close()
self.logger.error("Failed to connect to {}:{}".format(
self.ip, self.port))
return
self.close_signal.connect(self.close, Qt.BlockingQueuedConnection)
self.write_signal.connect(self._write)
self.connect_signal.connect(self._connectTo)
self.disconnect_signal.connect(self._disconnect)
self.reconnect_signal.connect(self._reconnect)
@Slot(bytes)
def _write(self, message: bytes):
"""Write dict to server"""
message = struct.pack('!L', len(message)) + message
self.tcpSocket.write(message)
self.tcpSocket.flush()
@Slot(int)
def on_qclient_socket_error(self, error):
self.logger.error(self.tcpSocket.errorString())
self.error.emit(error)
@Slot()
def on_qclient_socket_connected(self):
ip = self.tcpSocket.peerAddress().toString()
port = int(self.tcpSocket.peerPort())
self.logger.debug("Connected to {}:{}".format(ip, port))
self.connected.emit(ip, port)
@Slot()
def on_qclient_socket_disconnected(self):
self.logger.info("Disconnected from server")
self.disconnected.emit()
@Slot()
def on_qclient_socket_readyRead(self):
while self.tcpSocket.bytesAvailable():
size_left = self.data.get("size_left")
if size_left > 0:
message = self.tcpSocket.read(size_left)
size_left = size_left - len(message)
if size_left > 0:
self.data["size_left"] = size_left
self.data["data"] += message
else:
message = self.data.get("data") + message
self.data["size_left"] = 0
self.data["data"] = b""
self.message.emit(message)
else:
header_size = struct.calcsize('!L')
header = self.tcpSocket.read(header_size)
if len(header) == 4:
msg_size = struct.unpack('!L', header)[0]
message = self.tcpSocket.read(msg_size)
if len(message) < msg_size:
msg_size = msg_size - len(message)
self.data["data"] = message
self.data["size_left"] = msg_size
else:
self.message.emit(message)
@Slot(str, int)
def _connectTo(self, ip: str, port: int):
self._disconnect()
self.ip = ip
self.port = port
self.start()
@Slot()
def _reconnect(self):
self._disconnect()
self.start()
@Slot()
def _disconnect(self):
self.tcpSocket.disconnectFromHost()
@Slot()
def close(self):
self._disconnect()
self.tcpSocket.close()
self.closed.emit()