import zmq

from gi.repository import GLib

READ_EVENTS = (
    GLib.IOCondition.IN |
    GLib.IOCondition.HUP |
    GLib.IOCondition.ERR
)

class ZMQSource(GLib.Source):
    def set_socket(self, sock):
        self.sock = sock

        fd = sock.getsockopt(zmq.FD)
        self.poll_fd = GLib.PollFD(
            fd=fd,
            events=READ_EVENTS,
        )
        self.add_poll(self.poll_fd)

    def prepare(self):
        return (False, -1)

    def check(self):
        if not self.poll_fd.revents:
            return False

        events = self.sock.getsockopt(zmq.EVENTS)
        return bool(events & zmq.POLLIN)

    def dispatch(self, callback, user_data):
        try:
            while True:
                data = self.sock.recv(zmq.NOBLOCK)
                callback(self.sock, data, *user_data)
        except zmq.ZMQError as e:
            if e.errno != zmq.EAGAIN:
                raise
        return True
_ZMQSource = ZMQSource

def ZMQSource(sock):
    s = _ZMQSource()
    s.set_socket(sock)
    return s