root / snf-cyclades-app / synnefo / logic / callbacks.py @ a17a8e98
History | View | Annotate | Download (7.1 kB)
1 |
# Copyright 2011 GRNET S.A. All rights reserved.
|
---|---|
2 |
#
|
3 |
# Redistribution and use in source and binary forms, with or without
|
4 |
# modification, are permitted provided that the following conditions
|
5 |
# are met:
|
6 |
#
|
7 |
# 1. Redistributions of source code must retain the above copyright
|
8 |
# notice, this list of conditions and the following disclaimer.
|
9 |
#
|
10 |
# 2. Redistributions in binary form must reproduce the above copyright
|
11 |
# notice, this list of conditions and the following disclaimer in the
|
12 |
# documentation and/or other materials provided with the distribution.
|
13 |
#
|
14 |
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
15 |
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
16 |
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
17 |
# ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
18 |
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
19 |
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
20 |
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
21 |
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
22 |
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
23 |
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
24 |
# SUCH DAMAGE.
|
25 |
#
|
26 |
# The views and conclusions contained in the software and documentation are
|
27 |
# those of the authors and should not be interpreted as representing official
|
28 |
# policies, either expressed or implied, of GRNET S.A.
|
29 |
|
30 |
# Callback functions used by the dispatcher to process incoming notifications
|
31 |
# from AMQP queues.
|
32 |
|
33 |
import logging |
34 |
import json |
35 |
from functools import wraps |
36 |
from datetime import datetime |
37 |
|
38 |
from synnefo.db.models import VirtualMachine |
39 |
from synnefo.logic import utils, backend |
40 |
|
41 |
from synnefo.lib.utils import merge_time |
42 |
|
43 |
|
44 |
log = logging.getLogger() |
45 |
|
46 |
|
47 |
def handle_message_delivery(func): |
48 |
""" Generic decorator for handling messages.
|
49 |
|
50 |
This decorator is responsible for converting the message into json format,
|
51 |
handling of common exceptions and acknowledment of message if needed.
|
52 |
|
53 |
"""
|
54 |
@wraps(func)
|
55 |
def wrapper(client, message, *args, **kwargs): |
56 |
try:
|
57 |
msg = json.loads(message['body'])
|
58 |
func(msg) |
59 |
client.basic_ack(message) |
60 |
except ValueError: |
61 |
log.error("Incoming message not in JSON format: %s", message)
|
62 |
client.basic_ack(message) |
63 |
except KeyError: |
64 |
log.error("Malformed incoming JSON, missing attributes: %s",
|
65 |
message) |
66 |
client.basic_ack(message) |
67 |
except Exception as e: |
68 |
log.exception("Unexpected error: %s, msg: %s", e, msg)
|
69 |
|
70 |
return wrapper
|
71 |
|
72 |
def instance_from_msg(func): |
73 |
""" Decorator for getting the VirtualMachine object of the msg.
|
74 |
|
75 |
"""
|
76 |
@handle_message_delivery
|
77 |
@wraps(func)
|
78 |
def wrapper(msg): |
79 |
try:
|
80 |
vm_id = utils.id_from_instance_name(msg["instance"])
|
81 |
vm = VirtualMachine.objects.get(id=vm_id) |
82 |
func(vm, msg) |
83 |
except VirtualMachine.InvalidBackendIdError:
|
84 |
log.debug("Ignoring msg for unknown instance %s.", msg['instance']) |
85 |
except VirtualMachine.DoesNotExist:
|
86 |
log.error("VM for instance %s with id %d not found in DB.",
|
87 |
msg['instance'], vm_id)
|
88 |
return wrapper
|
89 |
|
90 |
def network_from_msg(func): |
91 |
""" Decorator for getting the Network object of the msg.
|
92 |
|
93 |
"""
|
94 |
@handle_message_delivery
|
95 |
@wraps(func)
|
96 |
def wrapper(msg): |
97 |
try:
|
98 |
network_id = utils.id_from_network_name(msg["network"])
|
99 |
network = Network.objects.get(id=network_id) |
100 |
func(network, msg) |
101 |
except Network.InvalidBackendIdError:
|
102 |
log.debug("Ignoring msg for unknown network %s.", msg['network']) |
103 |
except Network.DoesNotExist:
|
104 |
log.error("Network %s with id %d not found in DB.",
|
105 |
msg['network'], vm_id)
|
106 |
return wrapper
|
107 |
|
108 |
def if_update_required(func): |
109 |
"""
|
110 |
Decorator for checking if an incoming message needs to update the db.
|
111 |
|
112 |
The database will not be updated in the following cases:
|
113 |
- The message has been redelivered and the action has already been
|
114 |
completed. In this case the event_time will be equal with the one
|
115 |
in the database.
|
116 |
- The message describes a previous state in the ganeti, from the one that is
|
117 |
described in the db. In this case the event_time will be smaller from the
|
118 |
one in the database.
|
119 |
|
120 |
"""
|
121 |
@wraps(func)
|
122 |
def wrapper(target, msg): |
123 |
event_time = merge_time(msg['event_time'])
|
124 |
db_time = target.backendtime |
125 |
|
126 |
if event_time <= db_time:
|
127 |
format_ = "%d/%m/%y %H:%M:%S:%f"
|
128 |
log.debug("Ignoring message %s.\nevent_timestamp: %s db_timestamp: %s",
|
129 |
msg, |
130 |
event_time.strftime(format_), |
131 |
db_time.strftime(format_)) |
132 |
return
|
133 |
# New message. Update the database!
|
134 |
func(target, msg, event_time) |
135 |
|
136 |
return wrapper
|
137 |
|
138 |
|
139 |
@instance_from_msg
|
140 |
@if_update_required
|
141 |
def update_db(vm, msg, event_time): |
142 |
"""Process a notification of type 'ganeti-op-status'"""
|
143 |
log.debug("Processing ganeti-op-status msg: %s", msg)
|
144 |
|
145 |
if msg['type'] != "ganeti-op-status": |
146 |
log.error("Message is of unknown type %s.", msg['type']) |
147 |
return
|
148 |
|
149 |
backend.process_op_status(vm, event_time, msg['jobId'], msg['operation'], |
150 |
msg['status'], msg['logmsg']) |
151 |
|
152 |
log.debug("Done processing ganeti-op-status msg for vm %s.",
|
153 |
msg['instance'])
|
154 |
|
155 |
|
156 |
@instance_from_msg
|
157 |
@if_update_required
|
158 |
def update_net(vm, msg, event_time): |
159 |
"""Process a notification of type 'ganeti-net-status'"""
|
160 |
log.debug("Processing ganeti-net-status msg: %s", msg)
|
161 |
|
162 |
if msg['type'] != "ganeti-net-status": |
163 |
log.error("Message is of unknown type %s", msg['type']) |
164 |
return
|
165 |
|
166 |
backend.process_net_status(vm, event_time, msg['nics'])
|
167 |
|
168 |
log.debug("Done processing ganeti-net-status msg for vm %s.",
|
169 |
msg["instance"])
|
170 |
|
171 |
|
172 |
@network_from_msg
|
173 |
@if_update_required
|
174 |
def update_network(network, msg, event_time): |
175 |
"""Process a notification of type 'ganeti-network-status'"""
|
176 |
log.debug("Processing ganeti-network-status msg: %s", msg)
|
177 |
|
178 |
if msg['type'] != "ganeti-network-status": |
179 |
log.error("Message is of unknown type %s.", msg['type']) |
180 |
return
|
181 |
|
182 |
|
183 |
log.debug("Done processing ganeti-network-status msg for vm %s.",
|
184 |
msg['instance'])
|
185 |
|
186 |
|
187 |
@instance_from_msg
|
188 |
@if_update_required
|
189 |
def update_build_progress(vm, msg, event_time): |
190 |
"""Process a create progress message"""
|
191 |
log.debug("Processing ganeti-create-progress msg: %s", msg)
|
192 |
|
193 |
if msg['type'] != "ganeti-create-progress": |
194 |
log.error("Message is of unknown type %s", msg['type']) |
195 |
return
|
196 |
|
197 |
backend.process_create_progress(vm, event_time, msg['rprogress'], None) |
198 |
|
199 |
log.debug("Done processing ganeti-create-progress msg for vm %s.",
|
200 |
msg['instance'])
|
201 |
|
202 |
|
203 |
def dummy_proc(client, message, *args, **kwargs): |
204 |
try:
|
205 |
log.debug("Msg: %s", message['body']) |
206 |
client.basic_ack(message) |
207 |
except Exception as e: |
208 |
log.exception("Could not receive message")
|