root / snf-cyclades-gtools / synnefo / ganeti / eventd.py @ 39ccdb18
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1 | b024b97a | Georgios Gousios | #!/usr/bin/env python
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2 | 737b0e28 | Vangelis Koukis | # -*- coding: utf-8 -*-
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3 | b024b97a | Georgios Gousios | #
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4 | 737b0e28 | Vangelis Koukis | # Copyright 2011 GRNET S.A. All rights reserved.
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5 | 737b0e28 | Vangelis Koukis | #
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6 | 737b0e28 | Vangelis Koukis | # Redistribution and use in source and binary forms, with or
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7 | 737b0e28 | Vangelis Koukis | # without modification, are permitted provided that the following
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8 | 737b0e28 | Vangelis Koukis | # conditions are met:
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9 | 737b0e28 | Vangelis Koukis | #
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10 | 737b0e28 | Vangelis Koukis | # 1. Redistributions of source code must retain the above
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11 | 737b0e28 | Vangelis Koukis | # copyright notice, this list of conditions and the following
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12 | 737b0e28 | Vangelis Koukis | # disclaimer.
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13 | 737b0e28 | Vangelis Koukis | #
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14 | 737b0e28 | Vangelis Koukis | # 2. Redistributions in binary form must reproduce the above
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15 | 737b0e28 | Vangelis Koukis | # copyright notice, this list of conditions and the following
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16 | 737b0e28 | Vangelis Koukis | # disclaimer in the documentation and/or other materials
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17 | 737b0e28 | Vangelis Koukis | # provided with the distribution.
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18 | 737b0e28 | Vangelis Koukis | #
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19 | 737b0e28 | Vangelis Koukis | # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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20 | 737b0e28 | Vangelis Koukis | # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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21 | 737b0e28 | Vangelis Koukis | # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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22 | 737b0e28 | Vangelis Koukis | # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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23 | 737b0e28 | Vangelis Koukis | # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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24 | 737b0e28 | Vangelis Koukis | # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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25 | 737b0e28 | Vangelis Koukis | # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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26 | 737b0e28 | Vangelis Koukis | # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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27 | 737b0e28 | Vangelis Koukis | # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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28 | 737b0e28 | Vangelis Koukis | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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29 | 737b0e28 | Vangelis Koukis | # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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30 | 737b0e28 | Vangelis Koukis | # POSSIBILITY OF SUCH DAMAGE.
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31 | 737b0e28 | Vangelis Koukis | #
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32 | 737b0e28 | Vangelis Koukis | # The views and conclusions contained in the software and
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33 | 737b0e28 | Vangelis Koukis | # documentation are those of the authors and should not be
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34 | 737b0e28 | Vangelis Koukis | # interpreted as representing official policies, either expressed
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35 | 737b0e28 | Vangelis Koukis | # or implied, of GRNET S.A.
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36 | 737b0e28 | Vangelis Koukis | #
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37 | 45ebfd48 | Vangelis Koukis | |
38 | 737b0e28 | Vangelis Koukis | """Ganeti notification daemon with AMQP support
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39 | b024b97a | Georgios Gousios |
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40 | b024b97a | Georgios Gousios | A daemon to monitor the Ganeti job queue and publish job progress
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41 | 80bd5072 | Georgios Gousios | and Ganeti VM state notifications to the ganeti exchange
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42 | b024b97a | Georgios Gousios | """
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43 | b024b97a | Georgios Gousios | |
44 | b024b97a | Georgios Gousios | import sys |
45 | b024b97a | Georgios Gousios | import os |
46 | b024b97a | Georgios Gousios | path = os.path.normpath(os.path.join(os.getcwd(), '..'))
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47 | b024b97a | Georgios Gousios | sys.path.append(path) |
48 | b024b97a | Georgios Gousios | |
49 | b024b97a | Georgios Gousios | import json |
50 | b024b97a | Georgios Gousios | import logging |
51 | b024b97a | Georgios Gousios | import pyinotify |
52 | b024b97a | Georgios Gousios | import daemon |
53 | b024b97a | Georgios Gousios | import daemon.pidlockfile |
54 | 348f53de | Georgios Gousios | import socket |
55 | b024b97a | Georgios Gousios | from signal import signal, SIGINT, SIGTERM |
56 | b024b97a | Georgios Gousios | |
57 | b024b97a | Georgios Gousios | from ganeti import utils |
58 | b024b97a | Georgios Gousios | from ganeti import jqueue |
59 | b024b97a | Georgios Gousios | from ganeti import constants |
60 | b024b97a | Georgios Gousios | from ganeti import serializer |
61 | b024b97a | Georgios Gousios | |
62 | 6d6b8f88 | Kostas Papadimitriou | from synnefo import settings |
63 | c4e55622 | Christos Stavrakakis | from synnefo.lib.amqp import AMQPClient |
64 | c4e55622 | Christos Stavrakakis | |
65 | c4e55622 | Christos Stavrakakis | def get_time_from_status(op, job): |
66 | c4e55622 | Christos Stavrakakis | """Generate a unique message identifier for a ganeti job.
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67 | c4e55622 | Christos Stavrakakis |
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68 | c4e55622 | Christos Stavrakakis | The identifier is based on the timestamp of the job. Since a ganeti
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69 | c4e55622 | Christos Stavrakakis | job passes from multiple states, we need to pick the timestamp that
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70 | c4e55622 | Christos Stavrakakis | corresponds to each state.
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71 | c4e55622 | Christos Stavrakakis |
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72 | c4e55622 | Christos Stavrakakis | """
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73 | c4e55622 | Christos Stavrakakis | status = op.status |
74 | c4e55622 | Christos Stavrakakis | if status == constants.JOB_STATUS_QUEUED:
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75 | c4e55622 | Christos Stavrakakis | return job.received_timestamp
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76 | 39ccdb18 | Christos Stavrakakis | try: # Compatibility with Ganeti version |
77 | 39ccdb18 | Christos Stavrakakis | if status == constants.JOB_STATUS_WAITLOCK:
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78 | 39ccdb18 | Christos Stavrakakis | return op.start_timestamp
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79 | 39ccdb18 | Christos Stavrakakis | except AttributeError: |
80 | 39ccdb18 | Christos Stavrakakis | if status == constants.JOB_STATUS_WAITING:
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81 | 39ccdb18 | Christos Stavrakakis | return op.start_timestamp
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82 | c4e55622 | Christos Stavrakakis | if status == constants.JOB_STATUS_CANCELING:
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83 | c4e55622 | Christos Stavrakakis | return op.start_timestamp
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84 | c4e55622 | Christos Stavrakakis | if status == constants.JOB_STATUS_RUNNING:
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85 | c4e55622 | Christos Stavrakakis | return op.exec_timestamp
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86 | c4e55622 | Christos Stavrakakis | if status in constants.JOBS_FINALIZED: |
87 | c4e55622 | Christos Stavrakakis | # success, canceled, error
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88 | c4e55622 | Christos Stavrakakis | return op.end_timestamp
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89 | c4e55622 | Christos Stavrakakis | |
90 | c4e55622 | Christos Stavrakakis | raise InvalidBackendState(status, job)
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91 | c4e55622 | Christos Stavrakakis | |
92 | c4e55622 | Christos Stavrakakis | |
93 | c4e55622 | Christos Stavrakakis | class InvalidBackendStatus(Exception): |
94 | c4e55622 | Christos Stavrakakis | def __init__(self, status, job): |
95 | c4e55622 | Christos Stavrakakis | self.status = status
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96 | c4e55622 | Christos Stavrakakis | self.job = job
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97 | c4e55622 | Christos Stavrakakis | |
98 | c4e55622 | Christos Stavrakakis | def __str__(self): |
99 | c4e55622 | Christos Stavrakakis | return repr("Invalid backend status: %s in job %s" |
100 | c4e55622 | Christos Stavrakakis | % (self.status, self.job)) |
101 | c4e55622 | Christos Stavrakakis | |
102 | 39ccdb18 | Christos Stavrakakis | def prefix_from_name(name): |
103 | 39ccdb18 | Christos Stavrakakis | return name.split('-')[0] |
104 | 39ccdb18 | Christos Stavrakakis | |
105 | 39ccdb18 | Christos Stavrakakis | |
106 | 39ccdb18 | Christos Stavrakakis | def get_field(from_, field): |
107 | 39ccdb18 | Christos Stavrakakis | try:
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108 | 39ccdb18 | Christos Stavrakakis | return getattr(from_, field) |
109 | 39ccdb18 | Christos Stavrakakis | except AttributeError: |
110 | 39ccdb18 | Christos Stavrakakis | None
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111 | 39ccdb18 | Christos Stavrakakis | |
112 | 45ebfd48 | Vangelis Koukis | |
113 | b024b97a | Georgios Gousios | class JobFileHandler(pyinotify.ProcessEvent): |
114 | 348f53de | Georgios Gousios | def __init__(self, logger): |
115 | 348f53de | Georgios Gousios | pyinotify.ProcessEvent.__init__(self)
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116 | 348f53de | Georgios Gousios | self.logger = logger
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117 | c4e55622 | Christos Stavrakakis | self.client = AMQPClient()
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118 | c4e55622 | Christos Stavrakakis | handler_logger.info("Attempting to connect to RabbitMQ hosts")
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119 | c4e55622 | Christos Stavrakakis | self.client.connect()
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120 | c4e55622 | Christos Stavrakakis | handler_logger.info("Connected succesfully")
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121 | b024b97a | Georgios Gousios | |
122 | 39ccdb18 | Christos Stavrakakis | self.op_handlers = {"INSTANCE": self.process_instance_op, |
123 | 39ccdb18 | Christos Stavrakakis | "NETWORK": self.process_network_op} |
124 | 39ccdb18 | Christos Stavrakakis | # "GROUP": self.process_group_op}
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125 | 39ccdb18 | Christos Stavrakakis | |
126 | b024b97a | Georgios Gousios | def process_IN_CLOSE_WRITE(self, event): |
127 | 80dcd124 | Vangelis Koukis | self.process_IN_MOVED_TO(event)
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128 | 80dcd124 | Vangelis Koukis | |
129 | 80dcd124 | Vangelis Koukis | def process_IN_MOVED_TO(self, event): |
130 | b024b97a | Georgios Gousios | jobfile = os.path.join(event.path, event.name) |
131 | b024b97a | Georgios Gousios | if not event.name.startswith("job-"): |
132 | b024b97a | Georgios Gousios | self.logger.debug("Not a job file: %s" % event.path) |
133 | b024b97a | Georgios Gousios | return
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134 | b024b97a | Georgios Gousios | |
135 | b024b97a | Georgios Gousios | try:
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136 | b024b97a | Georgios Gousios | data = utils.ReadFile(jobfile) |
137 | b024b97a | Georgios Gousios | except IOError: |
138 | b024b97a | Georgios Gousios | return
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139 | b024b97a | Georgios Gousios | |
140 | b024b97a | Georgios Gousios | data = serializer.LoadJson(data) |
141 | 39ccdb18 | Christos Stavrakakis | try: # Compatibility with Ganeti version |
142 | 4ed30eed | Christos Stavrakakis | job = jqueue._QueuedJob.Restore(None, data, False) |
143 | 4ed30eed | Christos Stavrakakis | except TypeError: |
144 | 4ed30eed | Christos Stavrakakis | job = jqueue._QueuedJob.Restore(None, data)
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145 | 4ed30eed | Christos Stavrakakis | |
146 | 39ccdb18 | Christos Stavrakakis | job_id = int(job.id)
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147 | b024b97a | Georgios Gousios | |
148 | b024b97a | Georgios Gousios | for op in job.ops: |
149 | 39ccdb18 | Christos Stavrakakis | op_id = op.input.OP_ID |
150 | b024b97a | Georgios Gousios | |
151 | 39ccdb18 | Christos Stavrakakis | msg = None
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152 | b024b97a | Georgios Gousios | try:
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153 | 39ccdb18 | Christos Stavrakakis | handler_fn = self.op_handlers[op_id.split('_')[1]] |
154 | 39ccdb18 | Christos Stavrakakis | msg, routekey = handler_fn(op, job_id) |
155 | 39ccdb18 | Christos Stavrakakis | except KeyError: |
156 | b024b97a | Georgios Gousios | pass
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157 | b024b97a | Georgios Gousios | |
158 | 39ccdb18 | Christos Stavrakakis | if not msg: |
159 | 39ccdb18 | Christos Stavrakakis | self.logger.debug("Ignoring job: %s: %s", job_id, op_id) |
160 | 07e4ab22 | Christos Stavrakakis | continue
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161 | 07e4ab22 | Christos Stavrakakis | |
162 | 39ccdb18 | Christos Stavrakakis | # Generate a unique message identifier
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163 | 39ccdb18 | Christos Stavrakakis | event_time = get_time_from_status(op, job) |
164 | 39ccdb18 | Christos Stavrakakis | |
165 | b024b97a | Georgios Gousios | # Get the last line of the op log as message
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166 | b024b97a | Georgios Gousios | try:
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167 | b024b97a | Georgios Gousios | logmsg = op.log[-1][-1] |
168 | b024b97a | Georgios Gousios | except IndexError: |
169 | b024b97a | Georgios Gousios | logmsg = None
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170 | 348f53de | Georgios Gousios | |
171 | 39ccdb18 | Christos Stavrakakis | # Add shared attributes for all operations
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172 | 39ccdb18 | Christos Stavrakakis | msg.update({"event_time": event_time,
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173 | 39ccdb18 | Christos Stavrakakis | "operation": op_id,
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174 | 39ccdb18 | Christos Stavrakakis | "status": op.status,
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175 | 39ccdb18 | Christos Stavrakakis | "logmsg": logmsg,
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176 | 39ccdb18 | Christos Stavrakakis | "jobId": job_id})
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177 | c4e55622 | Christos Stavrakakis | |
178 | c4e55622 | Christos Stavrakakis | msg = json.dumps(msg) |
179 | 39ccdb18 | Christos Stavrakakis | self.logger.debug("Delivering msg: %s (key=%s)", msg, routekey) |
180 | c4e55622 | Christos Stavrakakis | |
181 | c4e55622 | Christos Stavrakakis | # Send the message to RabbitMQ
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182 | c4e55622 | Christos Stavrakakis | self.client.basic_publish(exchange=settings.EXCHANGE_GANETI,
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183 | c4e55622 | Christos Stavrakakis | routing_key=routekey, |
184 | c4e55622 | Christos Stavrakakis | body=msg) |
185 | b024b97a | Georgios Gousios | |
186 | 39ccdb18 | Christos Stavrakakis | |
187 | 39ccdb18 | Christos Stavrakakis | def process_instance_op(self, op, job_id): |
188 | 39ccdb18 | Christos Stavrakakis | """ Process OP_INSTANCE_* opcodes.
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189 | 39ccdb18 | Christos Stavrakakis |
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190 | 39ccdb18 | Christos Stavrakakis | """
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191 | 39ccdb18 | Christos Stavrakakis | input = op.input |
192 | 39ccdb18 | Christos Stavrakakis | op_id = input.OP_ID
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193 | 39ccdb18 | Christos Stavrakakis | |
194 | 39ccdb18 | Christos Stavrakakis | instances = None
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195 | 39ccdb18 | Christos Stavrakakis | instances = get_field(input, 'instance_name') |
196 | 39ccdb18 | Christos Stavrakakis | if not instances: |
197 | 39ccdb18 | Christos Stavrakakis | instances = get_field(input, 'instances') |
198 | 39ccdb18 | Christos Stavrakakis | if not instances or len(instances) > 1: |
199 | 39ccdb18 | Christos Stavrakakis | # Do not publish messages for jobs with no or multiple
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200 | 39ccdb18 | Christos Stavrakakis | # instances.
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201 | 39ccdb18 | Christos Stavrakakis | # Currently snf-dispatcher can not normally handle these messages
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202 | 39ccdb18 | Christos Stavrakakis | return None, None |
203 | 39ccdb18 | Christos Stavrakakis | else:
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204 | 39ccdb18 | Christos Stavrakakis | instances = instances[0]
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205 | 39ccdb18 | Christos Stavrakakis | |
206 | 39ccdb18 | Christos Stavrakakis | self.logger.debug("Job: %d: %s(%s) %s", job_id, op_id, |
207 | 39ccdb18 | Christos Stavrakakis | instances, op.status) |
208 | 39ccdb18 | Christos Stavrakakis | |
209 | 39ccdb18 | Christos Stavrakakis | msg = {"type": "ganeti-op-status", |
210 | 39ccdb18 | Christos Stavrakakis | "instance": instances,
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211 | 39ccdb18 | Christos Stavrakakis | "operation": op_id}
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212 | 39ccdb18 | Christos Stavrakakis | |
213 | 39ccdb18 | Christos Stavrakakis | routekey = "ganeti.%s.event.op" % prefix_from_name(instances)
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214 | 39ccdb18 | Christos Stavrakakis | |
215 | 39ccdb18 | Christos Stavrakakis | return msg, routekey
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216 | 39ccdb18 | Christos Stavrakakis | |
217 | 39ccdb18 | Christos Stavrakakis | def process_network_op(self, op, job_id): |
218 | 39ccdb18 | Christos Stavrakakis | """ Process OP_NETWORK_* opcodes.
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219 | 39ccdb18 | Christos Stavrakakis |
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220 | 39ccdb18 | Christos Stavrakakis | """
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221 | 39ccdb18 | Christos Stavrakakis | |
222 | 39ccdb18 | Christos Stavrakakis | input = op.input |
223 | 39ccdb18 | Christos Stavrakakis | op_id = input.OP_ID
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224 | 39ccdb18 | Christos Stavrakakis | network_name = get_field(input, 'network_name') |
225 | 39ccdb18 | Christos Stavrakakis | |
226 | 39ccdb18 | Christos Stavrakakis | if not network_name: |
227 | 39ccdb18 | Christos Stavrakakis | return None, None |
228 | 39ccdb18 | Christos Stavrakakis | |
229 | 39ccdb18 | Christos Stavrakakis | self.logger.debug("Job: %d: %s(%s) %s", job_id, op_id, |
230 | 39ccdb18 | Christos Stavrakakis | network_name, op.status) |
231 | 39ccdb18 | Christos Stavrakakis | |
232 | 39ccdb18 | Christos Stavrakakis | msg = {'operation': op_id,
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233 | 39ccdb18 | Christos Stavrakakis | 'type': "ganeti-network-status", |
234 | 39ccdb18 | Christos Stavrakakis | 'network': network_name,
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235 | 39ccdb18 | Christos Stavrakakis | 'subnet': get_field(input, 'network'), |
236 | 39ccdb18 | Christos Stavrakakis | # 'network_mode': get_field(input, 'network_mode'),
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237 | 39ccdb18 | Christos Stavrakakis | # 'network_link': get_field(input, 'network_link'),
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238 | 39ccdb18 | Christos Stavrakakis | 'gateway': get_field(input, 'gateway'), |
239 | 39ccdb18 | Christos Stavrakakis | # 'reserved_ips': get_field(input, 'reserved_ips'),
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240 | 39ccdb18 | Christos Stavrakakis | 'group_name': get_field(input, 'group_name')} |
241 | 39ccdb18 | Christos Stavrakakis | |
242 | 39ccdb18 | Christos Stavrakakis | routekey = "ganeti.%s.event.network" % prefix_from_name(network_name)
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243 | 39ccdb18 | Christos Stavrakakis | |
244 | 39ccdb18 | Christos Stavrakakis | return msg, routekey
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245 | 39ccdb18 | Christos Stavrakakis | |
246 | 39ccdb18 | Christos Stavrakakis | |
247 | 39ccdb18 | Christos Stavrakakis | # def process_group_op(self, op, job_id):
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248 | 39ccdb18 | Christos Stavrakakis | # """ Process OP_GROUP_* opcodes.
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249 | 39ccdb18 | Christos Stavrakakis | |
250 | 39ccdb18 | Christos Stavrakakis | # """
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251 | 39ccdb18 | Christos Stavrakakis | # return None, None
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252 | 39ccdb18 | Christos Stavrakakis | |
253 | 39ccdb18 | Christos Stavrakakis | |
254 | 39ccdb18 | Christos Stavrakakis | |
255 | 39ccdb18 | Christos Stavrakakis | |
256 | 39ccdb18 | Christos Stavrakakis | |
257 | b024b97a | Georgios Gousios | handler_logger = None
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258 | b024b97a | Georgios Gousios | def fatal_signal_handler(signum, frame): |
259 | b024b97a | Georgios Gousios | global handler_logger
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260 | b024b97a | Georgios Gousios | |
261 | b024b97a | Georgios Gousios | handler_logger.info("Caught fatal signal %d, will raise SystemExit",
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262 | 2cd99e7a | Georgios Gousios | signum) |
263 | b024b97a | Georgios Gousios | raise SystemExit |
264 | b024b97a | Georgios Gousios | |
265 | b024b97a | Georgios Gousios | def parse_arguments(args): |
266 | b024b97a | Georgios Gousios | from optparse import OptionParser |
267 | b024b97a | Georgios Gousios | |
268 | b024b97a | Georgios Gousios | parser = OptionParser() |
269 | b024b97a | Georgios Gousios | parser.add_option("-d", "--debug", action="store_true", dest="debug", |
270 | 2cd99e7a | Georgios Gousios | help="Enable debugging information")
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271 | b024b97a | Georgios Gousios | parser.add_option("-l", "--log", dest="log_file", |
272 | 45ebfd48 | Vangelis Koukis | default="/var/log/snf-ganeti-eventd.log",
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273 | 2cd99e7a | Georgios Gousios | metavar="FILE",
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274 | 2cd99e7a | Georgios Gousios | help="Write log to FILE instead of %s" %
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275 | 45ebfd48 | Vangelis Koukis | "/var/log/snf-ganeti-eventd.log")
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276 | b024b97a | Georgios Gousios | parser.add_option('--pid-file', dest="pid_file", |
277 | 45ebfd48 | Vangelis Koukis | default="/var/run/snf-ganeti-eventd.pid",
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278 | 2cd99e7a | Georgios Gousios | metavar='PIDFILE',
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279 | 2cd99e7a | Georgios Gousios | help="Save PID to file (default: %s)" %
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280 | 45ebfd48 | Vangelis Koukis | "/var/run/snf-ganeti-eventd.pid")
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281 | b024b97a | Georgios Gousios | |
282 | b024b97a | Georgios Gousios | return parser.parse_args(args)
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283 | b024b97a | Georgios Gousios | |
284 | b024b97a | Georgios Gousios | def main(): |
285 | b024b97a | Georgios Gousios | global handler_logger
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286 | b024b97a | Georgios Gousios | |
287 | b024b97a | Georgios Gousios | (opts, args) = parse_arguments(sys.argv[1:])
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288 | b024b97a | Georgios Gousios | |
289 | b024b97a | Georgios Gousios | # Create pidfile
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290 | b024b97a | Georgios Gousios | pidf = daemon.pidlockfile.TimeoutPIDLockFile(opts.pid_file, 10)
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291 | b024b97a | Georgios Gousios | |
292 | b024b97a | Georgios Gousios | # Initialize logger
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293 | b024b97a | Georgios Gousios | lvl = logging.DEBUG if opts.debug else logging.INFO |
294 | 03a4b970 | Georgios Gousios | logger = logging.getLogger("ganeti.eventd")
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295 | b024b97a | Georgios Gousios | logger.setLevel(lvl) |
296 | 36cf1973 | Vangelis Koukis | formatter = logging.Formatter( |
297 | 36cf1973 | Vangelis Koukis | "%(asctime)s %(module)s[%(process)d] %(levelname)s: %(message)s",
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298 | 36cf1973 | Vangelis Koukis | "%Y-%m-%d %H:%M:%S")
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299 | b024b97a | Georgios Gousios | handler = logging.FileHandler(opts.log_file) |
300 | b024b97a | Georgios Gousios | handler.setFormatter(formatter) |
301 | b024b97a | Georgios Gousios | logger.addHandler(handler) |
302 | b024b97a | Georgios Gousios | handler_logger = logger |
303 | b024b97a | Georgios Gousios | |
304 | 348f53de | Georgios Gousios | # Become a daemon:
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305 | 348f53de | Georgios Gousios | # Redirect stdout and stderr to handler.stream to catch
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306 | 348f53de | Georgios Gousios | # early errors in the daemonization process [e.g., pidfile creation]
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307 | 348f53de | Georgios Gousios | # which will otherwise go to /dev/null.
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308 | 348f53de | Georgios Gousios | daemon_context = daemon.DaemonContext( |
309 | 348f53de | Georgios Gousios | pidfile=pidf, |
310 | 348f53de | Georgios Gousios | umask=022,
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311 | 348f53de | Georgios Gousios | stdout=handler.stream, |
312 | 348f53de | Georgios Gousios | stderr=handler.stream, |
313 | 348f53de | Georgios Gousios | files_preserve=[handler.stream]) |
314 | 348f53de | Georgios Gousios | daemon_context.open() |
315 | 348f53de | Georgios Gousios | logger.info("Became a daemon")
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316 | 348f53de | Georgios Gousios | |
317 | 348f53de | Georgios Gousios | # Catch signals to ensure graceful shutdown
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318 | 348f53de | Georgios Gousios | signal(SIGINT, fatal_signal_handler) |
319 | 348f53de | Georgios Gousios | signal(SIGTERM, fatal_signal_handler) |
320 | 348f53de | Georgios Gousios | |
321 | b024b97a | Georgios Gousios | # Monitor the Ganeti job queue, create and push notifications
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322 | b024b97a | Georgios Gousios | wm = pyinotify.WatchManager() |
323 | 80dcd124 | Vangelis Koukis | mask = pyinotify.EventsCodes.ALL_FLAGS["IN_MOVED_TO"] | \
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324 | 80dcd124 | Vangelis Koukis | pyinotify.EventsCodes.ALL_FLAGS["IN_CLOSE_WRITE"]
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325 | 348f53de | Georgios Gousios | handler = JobFileHandler(logger) |
326 | b024b97a | Georgios Gousios | notifier = pyinotify.Notifier(wm, handler) |
327 | b024b97a | Georgios Gousios | |
328 | b024b97a | Georgios Gousios | try:
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329 | b024b97a | Georgios Gousios | # Fail if adding the inotify() watch fails for any reason
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330 | b024b97a | Georgios Gousios | res = wm.add_watch(constants.QUEUE_DIR, mask) |
331 | b024b97a | Georgios Gousios | if res[constants.QUEUE_DIR] < 0: |
332 | 36cf1973 | Vangelis Koukis | raise Exception("pyinotify add_watch returned negative descriptor") |
333 | 348f53de | Georgios Gousios | |
334 | b024b97a | Georgios Gousios | logger.info("Now watching %s" % constants.QUEUE_DIR)
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335 | b024b97a | Georgios Gousios | |
336 | b024b97a | Georgios Gousios | while True: # loop forever |
337 | 348f53de | Georgios Gousios | # process the queue of events as explained above
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338 | b024b97a | Georgios Gousios | notifier.process_events() |
339 | b024b97a | Georgios Gousios | if notifier.check_events():
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340 | b024b97a | Georgios Gousios | # read notified events and enqeue them
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341 | b024b97a | Georgios Gousios | notifier.read_events() |
342 | b024b97a | Georgios Gousios | except SystemExit: |
343 | b024b97a | Georgios Gousios | logger.info("SystemExit")
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344 | b024b97a | Georgios Gousios | except:
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345 | b024b97a | Georgios Gousios | logger.exception("Caught exception, terminating")
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346 | b024b97a | Georgios Gousios | finally:
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347 | b024b97a | Georgios Gousios | # destroy the inotify's instance on this interrupt (stop monitoring)
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348 | b024b97a | Georgios Gousios | notifier.stop() |
349 | b024b97a | Georgios Gousios | raise
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350 | b024b97a | Georgios Gousios | |
351 | b024b97a | Georgios Gousios | if __name__ == "__main__": |
352 | b024b97a | Georgios Gousios | sys.exit(main()) |
353 | b024b97a | Georgios Gousios | |
354 | 348f53de | Georgios Gousios | # vim: set sta sts=4 shiftwidth=4 sw=4 et ai : |