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#!/usr/bin/env python |
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# |
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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 hooks for Synnefo |
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These are the individual Ganeti hooks for Synnefo. |
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""" |
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import sys |
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import os |
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import json |
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import socket |
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import logging |
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from time import time |
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from synnefo import settings |
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from synnefo.lib.amqp import AMQPClient |
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from synnefo.lib.utils import split_time |
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from synnefo.util.mac2eui64 import mac2eui64 |
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def ganeti_net_status(logger, environ): |
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"""Produce notifications of type 'Ganeti-net-status' |
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Process all GANETI_INSTANCE_NICx_y environment variables, |
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where x is the NIC index, starting at 0, |
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and y is one of "MAC", "IP", "BRIDGE". |
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The result is returned as a single notification message |
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of type 'ganeti-net-status', detailing the NIC configuration |
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of a Ganeti instance. |
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""" |
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nics = {} |
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key_to_attr = {'IP': 'ip', |
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'MAC': 'mac', |
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'BRIDGE': 'link', |
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'NETWORK': 'network'} |
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for env in environ.keys(): |
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if env.startswith("GANETI_INSTANCE_NIC"): |
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s = env.replace("GANETI_INSTANCE_NIC", "").split('_', 1) |
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if len(s) == 2 and s[0].isdigit() and\ |
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s[1] in ('MAC', 'IP', 'BRIDGE', 'NETWORK'): |
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index = int(s[0]) |
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key = key_to_attr[s[1]] |
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if index in nics: |
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nics[index][key] = environ[env] |
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else: |
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nics[index] = {key: environ[env]} |
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# IPv6 support: |
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# |
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# The IPv6 is derived using an EUI64 scheme. |
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if key == 'mac': |
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subnet6 = environ.get("GANETI_INSTANCE_NIC" + s[0] + |
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"_NETWORK_SUBNET6", None) |
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if subnet6: |
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nics[index]['ipv6'] = mac2eui64(nics[index]['mac'], |
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subnet6) |
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# Amend notification with firewall settings |
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tags = environ.get('GANETI_INSTANCE_TAGS', '') |
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for tag in tags.split(' '): |
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t = tag.split(':') |
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if t[0:2] == ['synnefo', 'network']: |
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if len(t) != 4: |
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logger.error("Malformed synnefo tag %s", tag) |
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continue |
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try: |
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index = int(t[2]) |
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nics[index]['firewall'] = t[3] |
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except ValueError: |
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logger.error("Malformed synnefo tag %s", tag) |
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except KeyError: |
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logger.error("Found tag %s for non-existent NIC %d", |
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tag, index) |
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# Verify our findings are consistent with the Ganeti environment |
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indexes = list(nics.keys()) |
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ganeti_nic_count = int(environ['GANETI_INSTANCE_NIC_COUNT']) |
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if len(indexes) != ganeti_nic_count: |
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logger.error("I have %d NICs, Ganeti says number of NICs is %d", |
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len(indexes), ganeti_nic_count) |
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raise Exception("Inconsistent number of NICs in Ganeti environment") |
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if indexes != range(0, len(indexes)): |
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msg = "Ganeti NIC indexes are not consecutive starting at zero." |
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logger.error(msg) |
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msg = "NIC indexes are: %s. Environment is: %s" % (indexes, environ) |
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logger.error(msg) |
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raise Exception("Unexpected inconsistency in the Ganeti environment") |
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# Construct the notification |
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instance = environ['GANETI_INSTANCE_NAME'] |
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nics_list = [] |
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for i in indexes: |
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nics_list.append(nics[i]) |
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msg = { |
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"event_time": split_time(time()), |
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"type": "ganeti-net-status", |
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"instance": instance, |
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"nics": nics_list |
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} |
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return msg |
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class GanetiHook(): |
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def __init__(self, logger, environ, instance, prefix): |
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self.logger = logger |
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self.environ = environ |
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self.instance = instance |
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self.prefix = prefix |
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# Retry up to two times(per host) to open a channel to RabbitMQ. |
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# The hook needs to abort if this count is exceeded, because it |
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# runs synchronously with VM creation inside Ganeti, and may only |
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# run for a finite amount of time. |
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# FIXME: We need a reconciliation mechanism between the DB and |
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# Ganeti, for cases exactly like this. |
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self.client = AMQPClient(hosts=settings.AMQP_HOSTS, |
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max_retries=2 * len(settings.AMQP_HOSTS), |
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logger=logger) |
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self.client.connect() |
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def on_master(self): |
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"""Return True if running on the Ganeti master""" |
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return socket.getfqdn() == self.environ['GANETI_MASTER'] |
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def publish_msgs(self, msgs): |
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for (msgtype, msg) in msgs: |
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routekey = "ganeti.%s.event.%s" % (self.prefix, msgtype) |
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self.logger.debug("Pushing message to RabbitMQ: %s (key = %s)", |
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json.dumps(msg), routekey) |
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msg = json.dumps(msg) |
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self.client.basic_publish(exchange=settings.EXCHANGE_GANETI, |
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routing_key=routekey, |
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body=msg) |
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self.client.close() |
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class PostStartHook(GanetiHook): |
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"""Post-instance-startup Ganeti Hook. |
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Produce notifications to the rest of the Synnefo |
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infrastructure in the post-instance-start phase of Ganeti. |
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Currently, this list only contains a single message, |
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detailing the net configuration of an instance. |
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This hook only runs on the Ganeti master. |
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""" |
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def run(self): |
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if self.on_master(): |
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notifs = [] |
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notifs.append(("net", |
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ganeti_net_status(self.logger, self.environ)) |
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) |
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self.publish_msgs(notifs) |
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return 0 |
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class PostStopHook(GanetiHook): |
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def run(self): |
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return 0 |
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def main(): |
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logging.basicConfig(level=logging.DEBUG) |
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logger = logging.getLogger("synnefo.ganeti") |
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try: |
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instance = os.environ['GANETI_INSTANCE_NAME'] |
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op = os.environ['GANETI_HOOKS_PATH'] |
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phase = os.environ['GANETI_HOOKS_PHASE'] |
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except KeyError: |
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raise Exception("Environment missing one of: " |
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"GANETI_INSTANCE_NAME, GANETI_HOOKS_PATH," |
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" GANETI_HOOKS_PHASE") |
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prefix = instance.split('-')[0] |
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# FIXME: The hooks should only run for Synnefo instances. |
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# Uncomment the following lines for a shared Ganeti deployment. |
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# Currently, the following code is commented out because multiple |
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# backend prefixes are used in the same Ganeti installation during |
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# development. |
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#if not instance.startswith(settings.BACKEND_PREFIX_ID): |
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# logger.warning("Ignoring non-Synnefo instance %s", instance) |
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# return 0 |
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hooks = { |
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("instance-add", "post"): PostStartHook, |
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("instance-start", "post"): PostStartHook, |
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("instance-reboot", "post"): PostStartHook, |
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("instance-stop", "post"): PostStopHook, |
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("instance-modify", "post"): PostStartHook |
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} |
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try: |
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hook = hooks[(op, phase)](logger, os.environ, instance, prefix) |
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except KeyError: |
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raise Exception("No hook found for operation = '%s', phase = '%s'" % |
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(op, phase)) |
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return hook.run() |
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if __name__ == "__main__": |
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sys.exit(main()) |
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