Synnefo

#!/usr/bin/env python

# -*- coding: utf-8 -*-

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# Copyright 2011 GRNET S.A. All rights reserved.

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"""Ganeti notification daemon with AMQP support

A daemon to monitor the Ganeti job queue and publish job progress

and Ganeti VM state notifications to the ganeti exchange

"""

import sys

import os

path = os.path.normpath(os.path.join(os.getcwd(), '..'))

sys.path.append(path)

import json

import logging

import pyinotify

import daemon

import daemon.pidlockfile

import socket

from signal import signal, SIGINT, SIGTERM

from ganeti import utils

from ganeti import jqueue

from ganeti import constants

from ganeti import serializer

from synnefo import settings

from synnefo.lib.amqp import AMQPClient

def get_time_from_status(op, job):

    """Generate a unique message identifier for a ganeti job.

    The identifier is based on the timestamp of the job. Since a ganeti

    job passes from multiple states, we need to pick the timestamp that

    corresponds to each state.

    """

    status = op.status

    if status == constants.JOB_STATUS_QUEUED:

        return job.received_timestamp

    if status == constants.JOB_STATUS_WAITLOCK:

    #if status == constants.JOB_STATUS_WAITING:

        return op.start_timestamp

    if status == constants.JOB_STATUS_CANCELING:

        return op.start_timestamp

    if status == constants.JOB_STATUS_RUNNING:

        return op.exec_timestamp

    if status in constants.JOBS_FINALIZED:

        # success, canceled, error

        return op.end_timestamp

    raise InvalidBackendState(status, job)

class InvalidBackendStatus(Exception):

    def __init__(self, status, job):

        self.status = status

        self.job = job

    def __str__(self):

        return repr("Invalid backend status: %s in job %s"

                    % (self.status, self.job))

class JobFileHandler(pyinotify.ProcessEvent):

    def __init__(self, logger):

        pyinotify.ProcessEvent.__init__(self)

        self.logger = logger

        self.client = AMQPClient()

        handler_logger.info("Attempting to connect to RabbitMQ hosts")

        self.client.connect()

        handler_logger.info("Connected succesfully")

    def process_IN_CLOSE_WRITE(self, event):

        self.process_IN_MOVED_TO(event)

    def process_IN_MOVED_TO(self, event):

        jobfile = os.path.join(event.path, event.name)

        if not event.name.startswith("job-"):

            self.logger.debug("Not a job file: %s" % event.path)

            return

        try:

            data = utils.ReadFile(jobfile)

        except IOError:

            return

        data = serializer.LoadJson(data)

        try: # Version compatibility issue with Ganeti

            job = jqueue._QueuedJob.Restore(None, data, False)

        except TypeError:

            job = jqueue._QueuedJob.Restore(None, data)

        for op in job.ops:

            instances = ""

            try:

                instances = " ".join(op.input.instances)

            except AttributeError:

                pass

            try:

                instances = op.input.instance_name

            except AttributeError:

                pass

            # Get the last line of the op log as message

            try:

                logmsg = op.log[-1][-1]

            except IndexError:

                logmsg = None

            # Generate a unique message identifier

            event_time = get_time_from_status(op, job)

            self.logger.debug("Job: %d: %s(%s) %s %s",

                    int(job.id), op.input.OP_ID, instances, op.status, logmsg)

            # Construct message

            msg = {

                    "event_time" : event_time,

                    "type": "ganeti-op-status",

                    "instance": instances,

                    "operation": op.input.OP_ID,

                    "jobId": int(job.id),

                    "status": op.status,

                    "logmsg": logmsg

                    }

            instance_prefix = instances.split('-')[0]

            routekey = "ganeti.%s.event.op" % instance_prefix

            self.logger.debug("Delivering msg: %s (key=%s)", json.dumps(msg),

                              routekey)

            msg = json.dumps(msg)

            # Send the message to RabbitMQ

            self.client.basic_publish(exchange=settings.EXCHANGE_GANETI,

                                      routing_key=routekey,

                                      body=msg)

handler_logger = None

def fatal_signal_handler(signum, frame):

    global handler_logger

    handler_logger.info("Caught fatal signal %d, will raise SystemExit",

                        signum)

    raise SystemExit

def parse_arguments(args):

    from optparse import OptionParser

    parser = OptionParser()

    parser.add_option("-d", "--debug", action="store_true", dest="debug",

                      help="Enable debugging information")

    parser.add_option("-l", "--log", dest="log_file",

                      default="/var/log/snf-ganeti-eventd.log",

                      metavar="FILE",

                      help="Write log to FILE instead of %s" %

                          "/var/log/snf-ganeti-eventd.log")

    parser.add_option('--pid-file', dest="pid_file",

                      default="/var/run/snf-ganeti-eventd.pid",

                      metavar='PIDFILE',

                      help="Save PID to file (default: %s)" %

                          "/var/run/snf-ganeti-eventd.pid")

    return parser.parse_args(args)

def main():

    global handler_logger

    (opts, args) = parse_arguments(sys.argv[1:])

    # Create pidfile

    pidf = daemon.pidlockfile.TimeoutPIDLockFile(opts.pid_file, 10)

    # Initialize logger

    lvl = logging.DEBUG if opts.debug else logging.INFO

    logger = logging.getLogger("ganeti.eventd")

    logger.setLevel(lvl)

    formatter = logging.Formatter(

        "%(asctime)s %(module)s[%(process)d] %(levelname)s: %(message)s",

        "%Y-%m-%d %H:%M:%S")

    handler = logging.FileHandler(opts.log_file)

    handler.setFormatter(formatter)

    logger.addHandler(handler)

    handler_logger = logger

    # Become a daemon:

    # Redirect stdout and stderr to handler.stream to catch

    # early errors in the daemonization process [e.g., pidfile creation]

    # which will otherwise go to /dev/null.

    daemon_context = daemon.DaemonContext(

            pidfile=pidf,

            umask=022,

            stdout=handler.stream,

            stderr=handler.stream,

            files_preserve=[handler.stream])

    daemon_context.open()

    logger.info("Became a daemon")

    # Catch signals to ensure graceful shutdown

    signal(SIGINT, fatal_signal_handler)

    signal(SIGTERM, fatal_signal_handler)

    # Monitor the Ganeti job queue, create and push notifications

    wm = pyinotify.WatchManager()

    mask = pyinotify.EventsCodes.ALL_FLAGS["IN_MOVED_TO"] | \

           pyinotify.EventsCodes.ALL_FLAGS["IN_CLOSE_WRITE"]

    handler = JobFileHandler(logger)

    notifier = pyinotify.Notifier(wm, handler)

    try:

        # Fail if adding the inotify() watch fails for any reason

        res = wm.add_watch(constants.QUEUE_DIR, mask)

        if res[constants.QUEUE_DIR] < 0:

            raise Exception("pyinotify add_watch returned negative descriptor")

        logger.info("Now watching %s" % constants.QUEUE_DIR)

        while True:    # loop forever

            # process the queue of events as explained above

            notifier.process_events()

            if notifier.check_events():

                # read notified events and enqeue them

                notifier.read_events()

    except SystemExit:

        logger.info("SystemExit")

    except:

        logger.exception("Caught exception, terminating")

    finally:

        # destroy the inotify's instance on this interrupt (stop monitoring)

        notifier.stop()

        raise

if __name__ == "__main__":

    sys.exit(main())

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