# vim: tabstop=4 shiftwidth=4 softtabstop=4

#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

import errno
import eventlet
from eventlet.green import socket
import fcntl
import logging
import os
import stat

class CapeEventListener:

    def __init__(self):
        self.backlog = 50
        self.file = 'pacemaker-cloud-cped'

        sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
        flags = fcntl.fcntl(sock, fcntl.F_GETFD)
        fcntl.fcntl(sock, fcntl.F_SETFD, flags | fcntl.FD_CLOEXEC)
        sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        try:
            st = os.stat(self.file)
        except OSError, err:
            if err.errno != errno.ENOENT:
                raise
        else:
            if stat.S_ISSOCK(st.st_mode):
                os.remove(self.file)
            else:
                raise ValueError("File %s exists and is not a socket", self.file)
        sock.bind(self.file)
        sock.listen(self.backlog)
        os.chmod(self.file, 0600)

        eventlet.spawn_n(self.cape_event_listner, sock)

    def cape_event_listner(self, sock):
        eventlet.serve(sock, self.cape_event_handle)

    def cape_event_handle(self, sock, client_addr):
        while True:
            x = sock.recv(4096)
            # TODO(asalkeld) format this event "nicely"
            logger.info('%s' % x.strip('\n'))
            if not x: break