from eventlet import patcher
from eventlet.green import zmq
from eventlet.hubs import poll
from eventlet.hubs.hub import BaseHub, noop
from eventlet.hubs.poll  import READ, WRITE
from eventlet.support import clear_sys_exc_info
import sys

time = patcher.original('time')
select = patcher.original('select')
sleep = time.sleep

EXC_MASK = zmq.POLLERR
READ_MASK = zmq.POLLIN
WRITE_MASK = zmq.POLLOUT

class Hub(poll.Hub):



    def __init__(self, clock=time.time):
        BaseHub.__init__(self, clock)
        self.poll = zmq.Poller()

    def register(self, fileno, new=False):
        mask = 0
        if self.listeners[READ].get(fileno):
            mask |= READ_MASK
        if self.listeners[WRITE].get(fileno):
            mask |= WRITE_MASK
        if mask:
            self.poll.register(fileno, mask)
        else:
            self.poll.unregister(fileno)


    def wait(self, seconds=None):
        readers = self.listeners[READ]
        writers = self.listeners[WRITE]

        if not readers and not writers:
            if seconds:
                sleep(seconds)
            return
        try:
            presult = self.do_poll(seconds)
        except zmq.ZMQError, e:
            # In the poll hub this part exists to special case some exceptions
            # from socket. There may be some error numbers that wider use of
            # this hub will throw up as needing special treatment so leaving
            # this block and this comment as a remineder
            raise
        SYSTEM_EXCEPTIONS = self.SYSTEM_EXCEPTIONS

        if self.debug_blocking:
            self.block_detect_pre()

        for fileno, event in presult:
            try:
                if event & READ_MASK:
                    readers.get(fileno, noop).cb(fileno)
                if event & WRITE_MASK:
                    writers.get(fileno, noop).cb(fileno)
                if event & EXC_MASK:
                    # zmq.POLLERR is returned for any error condition in the
                    # underlying fd (as passed through to poll/epoll)
                    readers.get(fileno, noop).cb(fileno)
                    writers.get(fileno, noop).cb(fileno)
            except SYSTEM_EXCEPTIONS:
                raise
            except:
                self.squelch_exception(fileno, sys.exc_info())
                clear_sys_exc_info()

        if self.debug_blocking:
            self.block_detect_post()


#    def do_poll(self, seconds):
#        print 'poll: ', seconds
#        if seconds < 0:
#            seconds = 500
#        return self.poll.poll(seconds)