def run(self):
# Try to connect to an incoming tcp socket using its socket descriptor
tcpSocket = QTcpSocket()
if not tcpSocket.setSocketDescriptor(self.socketDescriptor):
FreeCAD.Console.PrintError("Socket not accepted.\n")
return
FreeCAD.Console.PrintLog("Socket accepted.\n")
# Wait for an incoming message
if not tcpSocket.waitForReadyRead(msecs=WAIT_TIME_MS):
FreeCAD.Console.PrintError("No request send.\n")
return
# Make an input data stream
instr = QDataStream(tcpSocket)
instr.setVersion(QDataStream.Qt_4_0)
# Try to read the message size
if self.blockSize == 0:
if tcpSocket.bytesAvailable() < 2:
FreeCAD.Console.PrintError("Received message "
+ "has too few bytes.\n")
return
self.blockSize = instr.readUInt16()
# Check message is sent complete
if tcpSocket.bytesAvailable() < self.blockSize:
FreeCAD.Console.PrintError("Received message has less bytes "
+ "then it's supposed to.\n")
return
# Read message and inform about it
cmd = instr.readRawData(self.blockSize).decode("UTF-8")
FreeCAD.Console.PrintLog("CommandServer received> "
+ cmd + "\n")
# Try to execute the message string and prepare a response
try:
exec(cmd)
except Exception as e:
FreeCAD.Console.PrintError("Executing external command failed:"
+ str(e) + "\n")
message = "Command failed - " + str(e)
else:
FreeCAD.Console.PrintLog("Executing external command succeeded!\n")
message = COMMAND_EXECUTED_CONFIRMATION_MESSAGE
# Prepare the data block to send back and inform about it
FreeCAD.Console.PrintLog("CommandServer sending> " + message + " \n")
block = QByteArray(
len(message.encode("UTF-8")).to_bytes(2, byteorder='big')
+ message.encode("UTF-8"))
outstr = QDataStream(block, QIODevice.WriteOnly)
outstr.setVersion(QDataStream.Qt_4_0)
# Send the block, disconnect from the socket and terminate the QThread
tcpSocket.write(block)
tcpSocket.disconnectFromHost()
tcpSocket.waitForDisconnected()
def run(self):
# Try to connect to an incomming tcp socket using its socket descriptor
tcpSocket = QTcpSocket()
if not tcpSocket.setSocketDescriptor(self.socketDescriptor):
FreeCAD.Console.PrintError("Socket not accepted.\n")
return
# Wait for an incomming message
if not tcpSocket.waitForReadyRead(msecs=WAIT_TIME_MS):
FreeCAD.Console.PrintError("No request send.\n")
return
# Make an input data stream
instr = QDataStream(tcpSocket)
instr.setVersion(QDataStream.Qt_4_0)
# Try to read the message size
if self.blockSize == 0:
if tcpSocket.bytesAvailable() < 2:
return
self.blockSize = instr.readUInt16()
# Check message is sent complete
if tcpSocket.bytesAvailable() < self.blockSize:
return
# Read message and inform about it
instr = instr.readString()
FreeCAD.Console.PrintLog("CommandServer received> " + str(instr) +
"\n")
# Try to execute the message string and prepare a response
try:
exec(str(instr))
except Exception as e:
FreeCAD.Console.PrintError("Executing external command failed:" +
str(e) + "\n")
message = "Command failed - " + str(e)
else:
FreeCAD.Console.PrintLog("Executing external command succeded!\n")
message = COMMAND_EXECUTED_CONFIRMATION_MESSAGE
# Prepare the data block to send back and inform about it
FreeCAD.Console.PrintLog("CommandServer sending> " + message + " \n")
block = QByteArray()
outstr = QDataStream(block, QIODevice.WriteOnly)
outstr.setVersion(QDataStream.Qt_4_0)
outstr.writeUInt16(0)
outstr.writeQString(message)
outstr.device().seek(0)
outstr.writeUInt16(block.size() - 2)
# Send the block, disconnect from the socket and terminate the QThread
tcpSocket.write(block)
tcpSocket.disconnectFromHost()
tcpSocket.waitForDisconnected()
def run(self):
self.mutex.lock()
serverName = self.hostName
serverPort = self.port
self.mutex.unlock()
while not self.quit:
Timeout = 5 * 1000
socket = QTcpSocket()
socket.connectToHost(serverName, serverPort)
if not socket.waitForConnected(Timeout):
self.error.emit(socket.error(), socket.errorString())
return
while socket.bytesAvailable() < 2:
if not socket.waitForReadyRead(Timeout):
self.error.emit(socket.error(), socket.errorString())
return
instr = QDataStream(socket)
instr.setVersion(QDataStream.Qt_4_0)
blockSize = instr.readUInt16()
block = QByteArray()
outstr = QDataStream(block, QIODevice.WriteOnly)
outstr.setVersion(QDataStream.Qt_4_0)
while socket.bytesAvailable() < blockSize:
if not socket.waitForReadyRead(Timeout):
self.error.emit(socket.error(), socket.errorString())
return
self.mutex.lock()
outstr.writeUInt16(0)
outstr.writeQString("Message to Server")
outstr.device().seek(0)
outstr.writeUInt16(block.size() - 2)
socket.write(block)
# socket.write(block)
fortune = instr.readQString()
self.newFortune.emit(fortune)
self.cond.wait(self.mutex)
serverName = self.hostName
serverPort = self.port
self.mutex.unlock()
def sendClientCommand(host, port, cmd, wait_time=WAIT_TIME_MS):
# Try to connect to a host server
tcpSocket = QTcpSocket()
tcpSocket.connectToHost(host, port, QIODevice.ReadWrite)
if not tcpSocket.waitForConnected(msecs=wait_time):
return CLIENT_ERROR_NO_CONNECTION
# Prepare a command message to be sent
block = QByteArray()
outstr = QDataStream(block, QIODevice.WriteOnly)
outstr.setVersion(QDataStream.Qt_4_0)
outstr.writeUInt16(0)
outstr.writeQString(cmd)
outstr.device().seek(0)
outstr.writeUInt16(block.size() - 2)
tcpSocket.write(block)
# Try to send the message
if not tcpSocket.waitForBytesWritten(msecs=wait_time):
return CLIENT_ERROR_BLOCK_NOT_WRITTEN
# Wait for a response from the host server
if not tcpSocket.waitForReadyRead(msecs=10000):
return CLIENT_ERROR_NO_RESPONSE
# Try to read the response
instr = QDataStream(tcpSocket)
instr.setVersion(QDataStream.Qt_4_0)
blockSize = 0
if blockSize == 0:
if tcpSocket.bytesAvailable() < 2:
return CLIENT_ERROR_RESPONSE_NOT_COMPLETE
blockSize = instr.readUInt16()
if tcpSocket.bytesAvailable() < blockSize:
return CLIENT_ERROR_RESPONSE_NOT_COMPLETE
# Wait until the host server terminates the connection
tcpSocket.waitForDisconnected()
# Return value representing a command execution status
if instr.readString() == COMMAND_EXECUTED_CONFIRMATION_MESSAGE:
return CLIENT_COMMAND_EXECUTED
else:
return CLIENT_COMMAND_FAILED
def run(self):
self.mutex.lock()
serverName = self.hostName
serverPort = self.port
self.mutex.unlock()
while not self.quit:
Timeout = 5 * 1000
socket = QTcpSocket()
socket.connectToHost(serverName, serverPort)
if not socket.waitForConnected(Timeout):
self.error.emit(socket.error(), socket.errorString())
return
while socket.bytesAvailable() < 2:
if not socket.waitForReadyRead(Timeout):
self.error.emit(socket.error(), socket.errorString())
return
instr = QDataStream(socket)
instr.setVersion(QDataStream.Qt_4_0)
blockSize = instr.readUInt16()
while socket.bytesAvailable() < blockSize:
if not socket.waitForReadyRead(Timeout):
self.error.emit(socket.error(), socket.errorString())
return
self.mutex.lock()
fortune = instr.readQString()
self.newFortune.emit(fortune)
self.cond.wait(self.mutex)
serverName = self.hostName
serverPort = self.port
self.mutex.unlock()
def run(self):
self.mutex.lock()
serverName = self.hostName
serverPort = self.port
self.mutex.unlock()
while not self.quit:
Timeout = 5 * 1000
socket = QTcpSocket()
socket.connectToHost(serverName, serverPort)
if not socket.waitForConnected(Timeout):
self.error.emit(socket.error(), socket.errorString())
return
while socket.bytesAvailable() < 2:
if not socket.waitForReadyRead(Timeout):
self.error.emit(socket.error(), socket.errorString())
return
instr = QDataStream(socket)
instr.setVersion(QDataStream.Qt_4_0)
blockSize = instr.readUInt16()
while socket.bytesAvailable() < blockSize:
if not socket.waitForReadyRead(Timeout):
self.error.emit(socket.error(), socket.errorString())
return
self.mutex.lock()
fortune = instr.readQString()
self.newFortune.emit(fortune)
self.cond.wait(self.mutex)
serverName = self.hostName
serverPort = self.port
self.mutex.unlock()
class CommandClient:
## @property host
# A QtHostAddress to the `CommandServer`.
## @property port
# An int of port at which `CommandServer` is listening.
## @property tcpSocket
# A QTcpSocket used to contact `CommandSErver`
## @property blockSize
# An int representing size of incomming tcp message.
## @brief Initialization method for CommandClient.
#
#A class instance is created and its attributes are initialized.
#
#
# @param host A QtHostAddress to the `CommandServer`.
# @param port An int of port at which `CommandServer` is listening.
#
def __init__(self, host, port):
self.host = host
self.port = port
self.tcpSocket = QTcpSocket()
self.blockSize = 0
## @brief Method used to send commands from client to `CommandServer`.
#
#This method tries to connect to a specified host `CommandServer` via
#`tcpSocket`. If connection was successfull, the command `cmd` is sent.
#Then the response is expected. If the response is equal to
#COMMAND_EXECUTED_CONFIRMATION_MESSAGE, then the execution was successfull.
#The progress and result of `sendCommand` can be obtained from printed logs and
#return value.
#
#
# @param cmd A str command to be executed.
#
# @return
# `CLIENT_COMMAND_EXECUTED` if all went great and command was executed.
# `CLIENT_COMMAND_FAILED` if `cmd` execution failed.
# `CLIENT_ERROR_RESPONSE_NOT_COMPLETE` if a response received was incomplete.
# `CLIENT_ERROR_NO_RESPONSE` if there was no response within `WAIT_TIME_MS`.
# `CLIENT_ERROR_BLOCK_NOT_WRITTEN` if communication failed during sending.
# `CLIENT_ERROR_NO_CONNECTION` if no connection to a host was established.
#
def sendCommand(self, cmd):
# connect a Qt slot to receive and print errors
self.tcpSocket.error.connect(self.displayError)
# Try to connect to a host server
self.tcpSocket.connectToHost(self.host, self.port, QIODevice.ReadWrite)
if not self.tcpSocket.waitForConnected(msecs=WAIT_TIME_MS):
if "FreeCAD" in sys.modules:
FreeCAD.Console.PrintError(
"CommandClient.sendCommand error: " + "No connection\n")
else:
print("CommandClient.sendCommand error: No connection\n")
return CLIENT_ERROR_NO_CONNECTION
# Prepare a command message to be sent
block = QByteArray()
outstr = QDataStream(block, QIODevice.WriteOnly)
outstr.setVersion(QDataStream.Qt_4_0)
outstr.writeUInt16(0)
outstr.writeQString(cmd)
outstr.device().seek(0)
outstr.writeUInt16(block.size() - 2)
# Try to send the message
if "FreeCAD" in sys.modules:
FreeCAD.Console.PrintMessage("CommandClient sending> " + cmd +
"\n")
else:
print("CommandClient sending> " + cmd + "\n")
self.tcpSocket.write(block)
if not self.tcpSocket.waitForBytesWritten(msecs=WAIT_TIME_MS):
if "FreeCAD" in sys.modules:
FreeCAD.Console.PrintError(
"CommandClient.sendCommand error: " +
"Block not written\n")
else:
print("CommandClient.sendCommand error: Block not written\n")
return CLIENT_ERROR_BLOCK_NOT_WRITTEN
# Wait for a response from the host server
if not self.tcpSocket.waitForReadyRead(msecs=WAIT_TIME_MS):
if "FreeCAD" in sys.modules:
FreeCAD.Console.PrintError(
"CommandClient.sendCommand error: " +
"No response received.\n")
else:
print("CommandClient.sendCommand error: " +
"No response received.\n")
return CLIENT_ERROR_NO_RESPONSE
# Try to read the response
instr = QDataStream(self.tcpSocket)
instr.setVersion(QDataStream.Qt_4_0)
if self.blockSize == 0:
if self.tcpSocket.bytesAvailable() < 2:
return CLIENT_ERROR_RESPONSE_NOT_COMPLETE
self.blockSize = instr.readUInt16()
if self.tcpSocket.bytesAvailable() < self.blockSize:
return CLIENT_ERROR_RESPONSE_NOT_COMPLETE
response = instr.readString()
if "FreeCAD" in sys.modules:
FreeCAD.Console.PrintMessage("CommandClient received> " +
response + "\n")
else:
print("CommandClient received> " + response + "\n")
# Wait until the host server terminates the connection
self.tcpSocket.waitForDisconnected()
# Reset blockSize to prepare for sending next command
self.blockSize = 0
# Return value representing a command execution status
if response == COMMAND_EXECUTED_CONFIRMATION_MESSAGE:
return CLIENT_COMMAND_EXECUTED
else:
return CLIENT_COMMAND_FAILED
## @brief `Qt`'s slot method to print out received `tcpSocket`'s error.
#
#QAbstractSocket.RemoteHostClosedError is not printed, because it occurs
#naturaly when the `tcpSocket` closes after a transaction is over. Except that
#all errors are printed.
#
#
# @param socketError A QAbstractSocket::SocketError enum describing occured error.
#
def displayError(self, socketError):
if socketError != QAbstractSocket.RemoteHostClosedError:
if "FreeCAD" in sys.modules:
FreeCAD.Console.PrintError(
"CommandClient error occurred> %s." %
self.tcpSocket.errorString() + "\n")
else:
print("CommandClient error occurred> %s." %
self.tcpSocket.errorString() + "\n")
class CrossingNetwork(QObject):
# Změna stavu; signál pro stavový řádek
stateChanged = Signal(str)
def __init__(self, model, *args, **kwargs):
super().__init__(*args, **kwargs)
self.model = model
# Inicializace socketu
self.socket = QTcpSocket(self)
self.socket.readyRead.connect(self.read)
self.socket.stateChanged.connect(self.socketStateChanged)
# Příprava pro čtení dat
self.readBuffer = QByteArray()
self.textCodec = QTextCodec.codecForName("UTF-8")
@Slot()
def socketConnect(self):
# Nejdřív se odpoj, pokud už spojení běží
self.socket.abort()
# A znovu se připoj
self.socket.connectToHost(
"ksp.mff.cuni.cz", 48888)
@Slot()
def socketDisconnect(self):
# Odpoj se
self.socket.disconnectFromHost()
# Vyprázdni model
self.model.flush()
@Slot(SocketState)
def socketStateChanged(self, state):
if state == SocketState.ConnectedState:
# Připojeni? Pozdravíme server.
self.socket.write(self.textCodec.fromUnicode("HELLO\n"))
# A informujeme připojené posluchače o změně stavu
self.stateChanged.emit(str(state).split(".")[-1].split("State")[0])
def read(self):
# Přečteme všechno, co jsme dostali
while self.socket.bytesAvailable() > 0:
self.readBuffer += \
self.socket.read(128)
# Rozdělíme na řádky
lines = self.readBuffer.split("\n")
# Zbytek uložíme na příště
self.readBuffer = lines.pop()
# Zpracujeme řádky, které dorazily
for l in lines:
stripped = self.textCodec.toUnicode(l.data()).rstrip()
args = stripped.split(" ")
travellerType = args.pop(0)
argmap = dict(map(
lambda x: x.split("="), args))
if travellerType == "CAR":
self.addTraveller(Car(**argmap))
elif travellerType == "PEDESTRIAN":
self.addTraveller(
Pedestrian(**argmap))
def addTraveller(self, traveller):
# Uložíme si cestovatele
self.model.add(traveller)
# Nechť cestovatel vstoupí do oblasti
traveller.start(self)
def sendBack(self, traveller):
# Vrátíme cestovatele serveru
text = str(traveller) + "\n"
self.socket.write(self.textCodec.fromUnicode(text))
self.model.remove(traveller)
def sendClientCommand(host, port, cmd, wait_time=WAIT_TIME_MS):
"""
Method to be used for sending commands.
This method is an alternative to using `CommandClient`. It does not print any
logs, just returns a value saying how the execution went.
To send a command using this method do:
sendClientCommand("127.0.0.1",54333,
"FreeCAD.Console.PrintWarning('Hello World\\n')")
Args:
cmd: A str command to be executed.
host: A QtHostAddress to the `CommandServer`.
port: An int of port at which `CommandServer` is listening.
Kwargs:
wait_time: An int setting milliseconds to wait for connection or message.
Returns:
`CLIENT_COMMAND_EXECUTED` if all went great and command was executed.
`CLIENT_COMMAND_FAILED` if `cmd` execution failed.
`CLIENT_ERROR_RESPONSE_NOT_COMPLETE` if a response received was incomplete.
`CLIENT_ERROR_NO_RESPONSE` if there was no response within `WAIT_TIME_MS`.
`CLIENT_ERROR_BLOCK_NOT_WRITTEN` if communication failed during sending.
`CLIENT_ERROR_NO_CONNECTION` if no connection to a host was established.
"""
# Try to connect to a host server
tcpSocket = QTcpSocket()
tcpSocket.connectToHost(host, port, QIODevice.ReadWrite)
if not tcpSocket.waitForConnected(msecs=wait_time):
return CLIENT_ERROR_NO_CONNECTION
# Prepare a command message to be sent
block = QByteArray(
len(cmd.encode("UTF-8")).to_bytes(2, byteorder='big') +
cmd.encode("UTF-8"))
outstr = QDataStream(block, QIODevice.WriteOnly)
outstr.setVersion(QDataStream.Qt_4_0)
tcpSocket.write(block)
# Try to send the message
if not tcpSocket.waitForBytesWritten(msecs=wait_time):
return CLIENT_ERROR_BLOCK_NOT_WRITTEN
# Wait for a response from the host server
if not tcpSocket.waitForReadyRead(msecs=wait_time):
return CLIENT_ERROR_NO_RESPONSE
# Try to read the response
instr = QDataStream(tcpSocket)
instr.setVersion(QDataStream.Qt_4_0)
blockSize = 0
if blockSize == 0:
if tcpSocket.bytesAvailable() < 2:
return CLIENT_ERROR_RESPONSE_NOT_COMPLETE
blockSize = instr.readUInt16()
if tcpSocket.bytesAvailable() < blockSize:
return CLIENT_ERROR_RESPONSE_NOT_COMPLETE
# Wait until the host server terminates the connection
tcpSocket.waitForDisconnected()
# Return value representing a command execution status
if instr.readRawData(blockSize).decode("UTF-8") \
== COMMAND_EXECUTED_CONFIRMATION_MESSAGE:
return CLIENT_COMMAND_EXECUTED
else:
return CLIENT_COMMAND_FAILED
class CommandClient:
"""
Class to be used for sending commands.
This class can be used in FreeCAD's or regular python console to send commands
to a `CommandServer` using `sendCommand()`. The class prints logs as it moves
along.
Attributes:
host: A QtHostAddress to the `CommandServer`.
port: An int of port at which `CommandServer` is listening.
tcpSocket: A QTcpSocket used to contact `CommandSErver`
blockSize: An int representing size of incoming tcp message.
To send a commands do:
client = CommandClient("127.0.0.1",54321)
client.sendCommand('FreeCAD.Console.PrintError("Hello World\\n")\n')
client.sendCommand('FreeCAD.Console.PrintError("Bye Bye\\n")\n')
"""
def __init__(self, host, port):
"""
Initialization method for CommandClient.
A class instance is created and its attributes are initialized.
Args:
host: A QtHostAddress to the `CommandServer`.
port: An int of port at which `CommandServer` is listening.
"""
self.host = host
self.port = port
self.tcpSocket = QTcpSocket()
self.blockSize = 0
def sendCommand(self, cmd):
"""
Method used to send commands from client to `CommandServer`.
This method tries to connect to a specified host `CommandServer` via
`tcpSocket`. If connection was successful, the command `cmd` is sent.
Then the response is expected. If the response is equal to
COMMAND_EXECUTED_CONFIRMATION_MESSAGE, then the execution was successful.
The progress and result of `sendCommand` can be obtained from printed logs and
return value.
Args:
cmd: A str command to be executed.
Returns:
`CLIENT_COMMAND_EXECUTED` if all went great and command was executed.
`CLIENT_COMMAND_FAILED` if `cmd` execution failed.
`CLIENT_ERROR_RESPONSE_NOT_COMPLETE` if a response received was incomplete.
`CLIENT_ERROR_NO_RESPONSE` if there was no response within `WAIT_TIME_MS`.
`CLIENT_ERROR_BLOCK_NOT_WRITTEN` if communication failed during sending.
`CLIENT_ERROR_NO_CONNECTION` if no connection to a host was established.
"""
# connect a Qt slot to receive and print errors
self.tcpSocket.error.connect(self.displayError)
# Try to connect to a host server
self.tcpSocket.connectToHost(self.host, self.port, QIODevice.ReadWrite)
if not self.tcpSocket.waitForConnected(msecs=WAIT_TIME_MS):
if "FreeCAD" in sys.modules:
FreeCAD.Console.PrintError(
"CommandClient.sendCommand error: " + "No connection\n")
else:
print("CommandClient.sendCommand error: No connection\n")
return CLIENT_ERROR_NO_CONNECTION
# Prepare a command message to be sent
block = QByteArray(
len(cmd.encode("UTF-8")).to_bytes(2, byteorder='big') +
cmd.encode("UTF-8"))
outstr = QDataStream(block, QIODevice.WriteOnly)
outstr.setVersion(QDataStream.Qt_4_0)
# Try to send the message
if "FreeCAD" in sys.modules:
FreeCAD.Console.PrintMessage("CommandClient sending> " + cmd +
"\n")
else:
print("CommandClient sending> " + cmd + "\n")
self.tcpSocket.write(block)
if not self.tcpSocket.waitForBytesWritten(msecs=WAIT_TIME_MS):
if "FreeCAD" in sys.modules:
FreeCAD.Console.PrintError(
"CommandClient.sendCommand error: " +
"Block not written\n")
else:
print("CommandClient.sendCommand error: Block not written\n")
return CLIENT_ERROR_BLOCK_NOT_WRITTEN
# Wait for a response from the host server
if not self.tcpSocket.waitForReadyRead(msecs=WAIT_TIME_MS):
if "FreeCAD" in sys.modules:
FreeCAD.Console.PrintError(
"CommandClient.sendCommand error: " +
"No response received.\n")
else:
print("CommandClient.sendCommand error: " +
"No response received.\n")
return CLIENT_ERROR_NO_RESPONSE
# Try to read the response
instr = QDataStream(self.tcpSocket)
instr.setVersion(QDataStream.Qt_4_0)
if self.blockSize == 0:
if self.tcpSocket.bytesAvailable() < 2:
return CLIENT_ERROR_RESPONSE_NOT_COMPLETE
self.blockSize = instr.readUInt16()
if self.tcpSocket.bytesAvailable() < self.blockSize:
return CLIENT_ERROR_RESPONSE_NOT_COMPLETE
response = instr.readRawData(self.blockSize).decode("UTF-8")
if "FreeCAD" in sys.modules:
FreeCAD.Console.PrintMessage("CommandClient received> " +
response + "\n")
else:
print("CommandClient received> " + response + "\n")
# Wait until the host server terminates the connection
self.tcpSocket.waitForDisconnected()
# Reset blockSize to prepare for sending next command
self.blockSize = 0
# Return value representing a command execution status
if response == COMMAND_EXECUTED_CONFIRMATION_MESSAGE:
return CLIENT_COMMAND_EXECUTED
else:
return CLIENT_COMMAND_FAILED
def displayError(self, socketError):
"""
`Qt`'s slot method to print out received `tcpSocket`'s error.
QAbstractSocket.RemoteHostClosedError is not printed, because it occurs
naturally when the `tcpSocket` closes after a transaction is over. Except that
all errors are printed.
Args:
socketError: A QAbstractSocket::SocketError enum describing occurred error.
"""
if socketError != QAbstractSocket.RemoteHostClosedError:
if "FreeCAD" in sys.modules:
FreeCAD.Console.PrintError(
"CommandClient error occurred> %s." %
self.tcpSocket.errorString() + "\n")
else:
print("CommandClient error occurred> %s." %
self.tcpSocket.errorString() + "\n")
def run(self):
"""
Thread's functionality method.
The starting point for the thread. After calling start(), the newly created
thread calls this function. This function then tries to make QTcpSocket.
It waits `WAIT_TIME_MS` for an incoming message. If message is received
it checks its a whole message using blockSize sent in the first word as
an UINT16 number. If a whole message is received, the thread tries to execute
the message string and sends back an appropriate response. The response is
*Command failed - "error string"* if the execution failed, or *Command
executed successfully* otherwise. Then the thread is terminated.
"""
# Try to connect to an incoming tcp socket using its socket descriptor
tcpSocket = QTcpSocket()
if not tcpSocket.setSocketDescriptor(self.socketDescriptor):
FreeCAD.Console.PrintError("Socket not accepted.\n")
return
FreeCAD.Console.PrintLog("Socket accepted.\n")
# Wait for an incoming message
if not tcpSocket.waitForReadyRead(msecs=WAIT_TIME_MS):
FreeCAD.Console.PrintError("No request send.\n")
return
# Make an input data stream
instr = QDataStream(tcpSocket)
instr.setVersion(QDataStream.Qt_4_0)
# Try to read the message size
if self.blockSize == 0:
if tcpSocket.bytesAvailable() < 2:
FreeCAD.Console.PrintError("Received message " +
"has too few bytes.\n")
return
self.blockSize = instr.readUInt16()
# Check message is sent complete
if tcpSocket.bytesAvailable() < self.blockSize:
FreeCAD.Console.PrintError("Received message has less bytes " +
"then it's supposed to.\n")
return
# Read message and inform about it
cmd = instr.readRawData(self.blockSize).decode("UTF-8")
FreeCAD.Console.PrintLog("CommandServer received> " + cmd + "\n")
# Try to execute the message string and prepare a response
try:
exec(cmd)
except Exception as e:
FreeCAD.Console.PrintError("Executing external command failed:" +
str(e) + "\n")
message = "Command failed - " + str(e)
else:
FreeCAD.Console.PrintLog("Executing external command succeeded!\n")
message = COMMAND_EXECUTED_CONFIRMATION_MESSAGE
# Prepare the data block to send back and inform about it
FreeCAD.Console.PrintLog("CommandServer sending> " + message + " \n")
block = QByteArray(
len(message.encode("UTF-8")).to_bytes(2, byteorder='big') +
message.encode("UTF-8"))
outstr = QDataStream(block, QIODevice.WriteOnly)
outstr.setVersion(QDataStream.Qt_4_0)
# Send the block, disconnect from the socket and terminate the QThread
tcpSocket.write(block)
tcpSocket.disconnectFromHost()
tcpSocket.waitForDisconnected()