Method createSocket

Lib/logging/handlers.py:902–946

Try to create a socket and, if it's not a datagram socket, connect it to the other end. This method is called during handler initialization, but it's not regarded as an error if the other end isn't listening yet --- the method will be called again when emitting an ev

(self)

                raise

    def createSocket(self):
        """
        Try to create a socket and, if it's not a datagram socket, connect it
        to the other end. This method is called during handler initialization,
        but it's not regarded as an error if the other end isn't listening yet
        --- the method will be called again when emitting an event,
        if there is no socket at that point.
        """
        address = self.address
        socktype = self.socktype

        if isinstance(address, str):
            self.unixsocket = True
            # Syslog server may be unavailable during handler initialisation.
            # C's openlog() function also ignores connection errors.
            # Moreover, we ignore these errors while logging, so it's not worse
            # to ignore it also here.
            try:
                self._connect_unixsocket(address)
            except OSError:
                pass
        else:
            self.unixsocket = False
            if socktype is None:
                socktype = socket.SOCK_DGRAM
            host, port = address
            ress = socket.getaddrinfo(host, port, 0, socktype)
            if not ress:
                raise OSError("getaddrinfo returns an empty list")
            for res in ress:
                af, socktype, proto, _, sa = res
                err = sock = None
                try:
                    sock = socket.socket(af, socktype, proto)
                    if socktype == socket.SOCK_STREAM:
                        sock.connect(sa)
                    break
                except OSError as exc:
                    err = exc
                    if sock is not None:
                        sock.close()
            if err is not None:
                raise err
            self.socket = sock
            self.socktype = socktype

    def encodePriority(self, facility, priority):
        """