root / snf-cyclades-gtools / synnefo / ganeti / eventd.py @ 4ed30eed
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#
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# Copyright 2011 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above
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# copyright notice, this list of conditions and the following
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# disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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#
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"""Ganeti notification daemon with AMQP support
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A daemon to monitor the Ganeti job queue and publish job progress
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and Ganeti VM state notifications to the ganeti exchange
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"""
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import sys |
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import os |
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path = os.path.normpath(os.path.join(os.getcwd(), '..'))
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sys.path.append(path) |
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import time |
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import json |
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import logging |
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import pyinotify |
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import daemon |
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import daemon.pidlockfile |
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import socket |
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from signal import signal, SIGINT, SIGTERM |
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from amqplib import client_0_8 as amqp |
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from ganeti import utils |
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from ganeti import jqueue |
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from ganeti import constants |
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from ganeti import serializer |
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from synnefo import settings |
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class JobFileHandler(pyinotify.ProcessEvent): |
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def __init__(self, logger): |
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pyinotify.ProcessEvent.__init__(self)
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self.logger = logger
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self.chan = None |
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def open_channel(self): |
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conn = None
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while conn == None: |
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handler_logger.info("Attempting to connect to %s",
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settings.RABBIT_HOST) |
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try:
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conn = amqp.Connection(host=settings.RABBIT_HOST, |
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userid=settings.RABBIT_USERNAME, |
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password=settings.RABBIT_PASSWORD, |
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virtual_host=settings.RABBIT_VHOST) |
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except socket.error:
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time.sleep(1)
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handler_logger.info("Connection succesful, opening channel")
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return conn.channel()
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def process_IN_CLOSE_WRITE(self, event): |
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self.process_IN_MOVED_TO(event)
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def process_IN_MOVED_TO(self, event): |
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if self.chan == None: |
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self.chan = self.open_channel() |
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jobfile = os.path.join(event.path, event.name) |
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if not event.name.startswith("job-"): |
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self.logger.debug("Not a job file: %s" % event.path) |
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return
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try:
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data = utils.ReadFile(jobfile) |
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except IOError: |
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return
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data = serializer.LoadJson(data) |
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try: # Version compatibility issue with Ganeti |
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job = jqueue._QueuedJob.Restore(None, data, False) |
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except TypeError: |
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job = jqueue._QueuedJob.Restore(None, data)
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for op in job.ops: |
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instances = ""
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try:
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instances = " ".join(op.input.instances)
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except AttributeError: |
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pass
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try:
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instances = op.input.instance_name |
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except AttributeError: |
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pass
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# Get the last line of the op log as message
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try:
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logmsg = op.log[-1][-1] |
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except IndexError: |
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logmsg = None
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self.logger.debug("Job: %d: %s(%s) %s %s", |
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int(job.id), op.input.OP_ID, instances, op.status, logmsg)
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# Construct message
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msg = { |
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"type": "ganeti-op-status", |
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"instance": instances,
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"operation": op.input.OP_ID,
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"jobId": int(job.id), |
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"status": op.status,
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"logmsg": logmsg
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} |
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if logmsg:
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msg["message"] = logmsg
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instance = instances.split('-')[0] |
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routekey = "ganeti.%s.event.op" % instance
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self.logger.debug("Delivering msg: %s (key=%s)", |
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json.dumps(msg), routekey) |
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msg = amqp.Message(json.dumps(msg)) |
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msg.properties["delivery_mode"] = 2 # Persistent |
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while True: |
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try:
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self.chan.basic_publish(msg,
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exchange=settings.EXCHANGE_GANETI, |
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routing_key=routekey) |
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self.logger.debug("Message published to AMQP successfully") |
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return
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except socket.error:
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self.logger.exception("Server went away, reconnecting...") |
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self.chan = self.open_channel() |
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except Exception: |
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self.logger.exception("Caught unexpected exception, msg: ", |
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msg) |
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raise
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handler_logger = None
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def fatal_signal_handler(signum, frame): |
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global handler_logger
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handler_logger.info("Caught fatal signal %d, will raise SystemExit",
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signum) |
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raise SystemExit |
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def parse_arguments(args): |
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from optparse import OptionParser |
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parser = OptionParser() |
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parser.add_option("-d", "--debug", action="store_true", dest="debug", |
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help="Enable debugging information")
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parser.add_option("-l", "--log", dest="log_file", |
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default="/var/log/snf-ganeti-eventd.log",
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metavar="FILE",
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help="Write log to FILE instead of %s" %
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"/var/log/snf-ganeti-eventd.log")
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parser.add_option('--pid-file', dest="pid_file", |
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default="/var/run/snf-ganeti-eventd.pid",
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metavar='PIDFILE',
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help="Save PID to file (default: %s)" %
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"/var/run/snf-ganeti-eventd.pid")
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return parser.parse_args(args)
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def main(): |
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global handler_logger
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(opts, args) = parse_arguments(sys.argv[1:])
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# Create pidfile
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pidf = daemon.pidlockfile.TimeoutPIDLockFile(opts.pid_file, 10)
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# Initialize logger
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lvl = logging.DEBUG if opts.debug else logging.INFO |
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logger = logging.getLogger("ganeti.eventd")
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logger.setLevel(lvl) |
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formatter = logging.Formatter( |
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"%(asctime)s %(module)s[%(process)d] %(levelname)s: %(message)s",
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"%Y-%m-%d %H:%M:%S")
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handler = logging.FileHandler(opts.log_file) |
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handler.setFormatter(formatter) |
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logger.addHandler(handler) |
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handler_logger = logger |
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# Become a daemon:
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# Redirect stdout and stderr to handler.stream to catch
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# early errors in the daemonization process [e.g., pidfile creation]
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# which will otherwise go to /dev/null.
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daemon_context = daemon.DaemonContext( |
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pidfile=pidf, |
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umask=022,
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stdout=handler.stream, |
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stderr=handler.stream, |
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files_preserve=[handler.stream]) |
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daemon_context.open() |
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logger.info("Became a daemon")
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# Catch signals to ensure graceful shutdown
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signal(SIGINT, fatal_signal_handler) |
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signal(SIGTERM, fatal_signal_handler) |
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# Monitor the Ganeti job queue, create and push notifications
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wm = pyinotify.WatchManager() |
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mask = pyinotify.EventsCodes.ALL_FLAGS["IN_MOVED_TO"] | \
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pyinotify.EventsCodes.ALL_FLAGS["IN_CLOSE_WRITE"]
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handler = JobFileHandler(logger) |
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notifier = pyinotify.Notifier(wm, handler) |
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try:
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# Fail if adding the inotify() watch fails for any reason
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res = wm.add_watch(constants.QUEUE_DIR, mask) |
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if res[constants.QUEUE_DIR] < 0: |
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raise Exception("pyinotify add_watch returned negative descriptor") |
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logger.info("Now watching %s" % constants.QUEUE_DIR)
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while True: # loop forever |
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# process the queue of events as explained above
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notifier.process_events() |
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if notifier.check_events():
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# read notified events and enqeue them
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notifier.read_events() |
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except SystemExit: |
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logger.info("SystemExit")
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except:
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logger.exception("Caught exception, terminating")
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finally:
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# destroy the inotify's instance on this interrupt (stop monitoring)
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notifier.stop() |
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raise
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if __name__ == "__main__": |
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sys.exit(main()) |
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# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :
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