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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2016 Red Hat, Inc. <http://www.redhat.com>
# This file is part of GlusterFS.
#
# This file is licensed to you under your choice of the GNU Lesser
# General Public License, version 3 or any later version (LGPLv3 or
# later), or the GNU General Public License, version 2 (GPLv2), in all
# cases as published by the Free Software Foundation.
#
from __future__ import print_function
import asyncore
import socket
import os
from multiprocessing import Process, Queue
import sys
import signal
from eventtypes import all_events
import handlers
import utils
from eventsapiconf import SERVER_ADDRESS
from utils import logger
# Global Queue, EventsHandler will add items to the queue
# and process_event will gets each item and handles it
events_queue = Queue()
events_server_pid = None
def process_event():
"""
Seperate process which handles all the incoming events from Gluster
processes.
"""
while True:
data = events_queue.get()
logger.debug("EVENT: {0}".format(repr(data)))
try:
# Event Format <TIMESTAMP> <TYPE> <DETAIL>
ts, key, value = data.split(" ", 2)
except ValueError:
logger.warn("Invalid Event Format {0}".format(data))
continue
data_dict = {}
try:
# Format key=value;key=value
data_dict = dict(x.split('=') for x in value.split(';'))
except ValueError:
logger.warn("Unable to parse Event {0}".format(data))
continue
try:
# Event Type to Function Map, Recieved event data will be in
# the form <TIMESTAMP> <TYPE> <DETAIL>, Get Event name for the
# recieved Type/Key and construct a function name starting with
# handle_ For example: handle_event_volume_create
func_name = "handle_" + all_events[int(key)].lower()
except IndexError:
# This type of Event is not handled?
logger.warn("Unhandled Event: {0}".format(key))
func_name = None
if func_name is not None:
# Get function from handlers module
func = getattr(handlers, func_name, None)
# If func is None, then handler unimplemented for that event.
if func is not None:
func(ts, int(key), data_dict)
else:
# Generic handler, broadcast whatever received
handlers.generic_handler(ts, int(key), data_dict)
def process_event_wrapper():
try:
process_event()
except KeyboardInterrupt:
return
class GlusterEventsHandler(asyncore.dispatcher_with_send):
def handle_read(self):
data = self.recv(8192)
if data:
events_queue.put(data)
self.send(data)
class GlusterEventsServer(asyncore.dispatcher):
def __init__(self):
global events_server_pid
asyncore.dispatcher.__init__(self)
# Start the Events listener process which listens to
# the global queue
p = Process(target=process_event_wrapper)
p.start()
events_server_pid = p.pid
# Create UNIX Domain Socket, bind to path
self.create_socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.bind(SERVER_ADDRESS)
self.listen(5)
def handle_accept(self):
pair = self.accept()
if pair is not None:
sock, addr = pair
GlusterEventsHandler(sock)
def signal_handler_sigusr2(sig, frame):
if events_server_pid is not None:
os.kill(events_server_pid, signal.SIGUSR2)
utils.load_all()
def init_event_server():
utils.setup_logger()
# Delete Socket file if Exists
try:
os.unlink(SERVER_ADDRESS)
except OSError:
if os.path.exists(SERVER_ADDRESS):
print ("Failed to cleanup socket file {0}".format(SERVER_ADDRESS),
file=sys.stderr)
sys.exit(1)
utils.load_all()
# Start the Eventing Server, UNIX DOMAIN SOCKET Server
GlusterEventsServer()
asyncore.loop()
def main():
try:
init_event_server()
except KeyboardInterrupt:
sys.exit(1)
if __name__ == "__main__":
signal.signal(signal.SIGUSR2, signal_handler_sigusr2)
main()
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