IB python api socket WinError 10038

Question

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

Answer 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.

Answer 2

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()