def run(self):
self.log.debug('Connection id={} is starting'.format(self.conn_id))
def wait_and_read(n_bytes):
"""
Convenience function that simplifies reading and checking for stop events, etc.
Returns a byte string of length n_bytes or None if socket needs to be closed.
"""
data = b""
while len(data) < n_bytes:
if sock.bytesAvailable() == 0:
new_data = sock.waitForReadyRead(100) # wait for 100ms between read attempts
if not new_data:
if sock.state() != sock.ConnectedState or self.need_to_stop():
return None
else:
continue
if self.need_to_stop():
return None
new_data = sock.read(n_bytes - len(data))
if type(new_data) != bytes:
new_data = new_data.data()
data += new_data
return data
sock = QTcpSocket(None)
sock.setSocketDescriptor(self.socketDescriptor)
sock.waitForConnected()
while True:
read_len = wait_and_read(4)
if not read_len:
break
read_len = struct.unpack(">L", read_len)[0]
data = wait_and_read(read_len)
if not data:
break
if data.startswith(self.internal_prefix):
self.handle_internal_command(data)
continue
try:
logDict = self.deserialize(data)
record = LogRecord(logDict)
except Exception:
self.log.error('Creating log record failed', exc_info=True)
continue
self.new_record.emit(record)
self.log.debug('Connection id={} is stopping'.format(self.conn_id))
sock.disconnectFromHost()
sock.close()
self.connection_finished.emit(self)
self.log.debug('Connection id={} has stopped'.format(self.conn_id))
class Client(QMainWindow):
def __init__(self, *args, **kwargs):
super(Client, self).__init__(*args, **kwargs)
self.loginWidget = LoginWidget()
self.chatWidget = ChatWidget()
self.setCentralWidget(self.loginWidget)
self.socket = QTcpSocket()
self.setupConnections()
def setupConnections(self):
self.loginWidget.ui.pushButton.clicked.connect(self.connectToHost)
self.socket.readyRead.connect(self.readData)
self.socket.error.connect(self.displayConnectionError)
self.chatWidget.ui.pushButton.clicked.connect(self.sendUserMessage)
def connectToHost(self):
hostAddress = self.loginWidget.ui.addressLineEdit.text()
port = int(self.loginWidget.ui.portLineEdit.text())
self.socket.connectToHost(hostAddress, port)
if self.socket.waitForConnected(1000):
self.nickname = self.loginWidget.ui.nicknameLineEdit.text()
self.send(f'login {self.nickname}')
self.loginWidget.setParent(None)
self.setCentralWidget(self.chatWidget)
def send(self, message):
self.socket.write(message.encode('utf-8'))
def sendUserMessage(self):
userMessage = self.chatWidget.ui.lineEdit.text()
message = f'say {userMessage}'
self.send(message)
self.chatWidget.ui.lineEdit.clear()
self.chatWidget.ui.lineEdit.setFocus()
def readData(self):
server = self.sender()
data = server.readLine().data().decode('utf-8').split()
response = data[0]
if response == 'say':
self.chatWidget.ui.textBrowser.append(' '.join(data[1:]))
def displayConnectionError(self):
QMessageBox.information(self, '', 'Could not connect to host')
def closeEvent(self, event):
self.socket.disconnectFromHost()
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()