1

this is coded as 'connection.py' in the API for Interactive Brokers. When it runs, it returns an error 'An operation was attempted on something that was not a socket', at 'buf = self.socket.recv(4096)'. I have tried changing the value passed to recv to 7497, to match the Socket port, but get the same message. I think it may be a formatting error, but too new to python to know for sure.

logger = logging.getLogger(__name__)


class Connection:
    def __init__(self, host, port):
        self.host = host
        self.port = port
        self.socket = None
        self.wrapper = None
        self.lock = threading.Lock()


    def connect(self):
        try:
            self.socket = socket.socket()
        #TODO: list the exceptions you want to catch
        except socket.error:
            if self.wrapper:
                self.wrapper.error(NO_VALID_ID, FAIL_CREATE_SOCK.code(), FAIL_CREATE_SOCK.msg())

        try:
            self.socket.connect((self.host, self.port))
        except socket.error:
            if self.wrapper:
                self.wrapper.error(NO_VALID_ID, CONNECT_FAIL.code(), CONNECT_FAIL.msg())

        self.socket.settimeout(1)   #non-blocking


    def disconnect(self):
        self.lock.acquire()
        try:
            if self.socket is not None:
                logger.debug("disconnecting")
                self.socket.close()
                self.socket = None
                logger.debug("disconnected")
                if self.wrapper:
                    self.wrapper.connectionClosed()
        finally:
            self.lock.release()


    def isConnected(self):
        return self.socket is not None


    def sendMsg(self, msg):

        logger.debug("acquiring lock")
        self.lock.acquire()
        logger.debug("acquired lock")
        if not self.isConnected():
            logger.debug("sendMsg attempted while not connected, releasing lock")
            self.lock.release()
            return 0
        try:
            nSent = self.socket.send(msg)
        except socket.error:
            logger.debug("exception from sendMsg %s", sys.exc_info())
            raise
        finally:
            logger.debug("releasing lock")
            self.lock.release()
            logger.debug("release lock")

        logger.debug("sendMsg: sent: %d", nSent)

        return nSent


    def _recvMsg(self):
        if not self.isConnected():
            logger.debug("recvMsg attempted while not connected, releasing lock")
            return b""
        try:
            buf = self.recvAllMsg()
            # receiving 0 bytes outside a timeout means the connection is either
            # closed or broken
            if len(buf) == 0:
                logger.debug("socket either closed or broken, disconnecting")
                self.disconnect()
        except socket.timeout:
            logger.debug("socket timeout from recvMsg %s", sys.exc_info())
            buf = b""
        else:
            pass

        return buf

    def recvAllMsg(self):
        cont = True
        allbuf = b""

        while cont and self.socket is not None:
            buf = self.socket.recv(4096)
            allbuf += buf
            logger.debug("len %d raw:%s|", len(buf), buf)

            if len(buf) < 4096:
                cont = False

        return allbuf
1

4096 is the buffer size, not the port number. This error happens because one thread is exited while another is trying to write (to a nonexistent location). It's an IB issue but should not cause any problems, it's just ugly.

1

A workaround to implement at your EClient / EWrapper class:

  1. Create a socket shutdown function
  2. Use it before calling the disconnect method
# create function
def _socketShutdown(self):
    self.conn.lock.acquire()
    try:
        if self.conn.socket is not None:
            self.conn.socket.shutdown(socket.SHUT_WR)
    finally:
        self.conn.lock.release()

# use it
self._socketShutdown()
time.sleep(1) 
self.disconnect()

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