1ca46da302
AutoReconnect errors are not being handled and so, propagated to the client. This patch adds a safe_call decorator. The purpose of safe_call is to catch ConnectionFailure and raise a ConnectionError instead. Future patches will make the transport catch ConnectionError and handle it correctly instead of propagating it to the client. All storage back-end should support this. Fixes bug: #1169821 Change-Id: I523232a7cefbd00082447403ceb3abada9af6db3
148 lines
4.8 KiB
Python
148 lines
4.8 KiB
Python
# Copyright (c) 2013 Red Hat, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Implements the MongoDB storage controller for queues.
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Field Mappings:
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In order to reduce the disk / memory space used,
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field names will be, most of the time, the first
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letter of their long name.
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"""
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import marconi.openstack.common.log as logging
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from marconi import storage
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from marconi.storage import exceptions
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from marconi.storage.mongodb import utils
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LOG = logging.getLogger(__name__)
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class QueueController(storage.QueueBase):
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"""Implements queue resource operations using MongoDB.
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Queues:
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Name Field
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------------------
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name -> n
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project -> p
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counter -> c
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metadata -> m
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"""
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def __init__(self, *args, **kwargs):
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super(QueueController, self).__init__(*args, **kwargs)
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self._col = self.driver.db['queues']
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# NOTE(flaper87): This creates a unique compound index for
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# project and name. Using project as the first field of the
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# index allows for querying by project and project+name.
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# This is also useful for retrieving the queues list for
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# as specific project, for example. Order Matters!
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self._col.ensure_index([('p', 1), ('n', 1)], unique=True)
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#-----------------------------------------------------------------------
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# Helpers
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#-----------------------------------------------------------------------
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def _get(self, name, project=None, fields={'m': 1, '_id': 0}):
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queue = self._col.find_one({'p': project, 'n': name}, fields=fields)
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if queue is None:
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raise exceptions.QueueDoesNotExist(name, project)
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return queue
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def _get_id(self, name, project=None):
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"""Just like the `get` method, but only returns the queue's id
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:returns: Queue's `ObjectId`
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"""
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queue = self._get(name, project, fields=['_id'])
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return queue.get('_id')
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def _get_ids(self):
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"""Returns a generator producing a list of all queue IDs."""
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cursor = self._col.find({}, fields={'_id': 1})
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return (doc['_id'] for doc in cursor)
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#-----------------------------------------------------------------------
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# Interface
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#-----------------------------------------------------------------------
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def list(self, project=None, marker=None,
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limit=10, detailed=False):
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query = {'p': project}
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if marker:
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query['n'] = {'$gt': marker}
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fields = {'n': 1, '_id': 0}
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if detailed:
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fields['m'] = 1
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cursor = self._col.find(query, fields=fields)
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cursor = cursor.limit(limit).sort('n')
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marker_name = {}
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def normalizer(record):
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queue = {'name': record['n']}
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marker_name['next'] = queue['name']
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if detailed:
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queue['metadata'] = record['m']
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return queue
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yield utils.HookedCursor(cursor, normalizer)
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yield marker_name and marker_name['next']
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@utils.raises_conn_error
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def get(self, name, project=None):
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queue = self._get(name, project)
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return queue.get('m', {})
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@utils.raises_conn_error
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def upsert(self, name, metadata, project=None):
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super(QueueController, self).upsert(name, metadata, project)
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rst = self._col.update({'p': project, 'n': name},
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{'$set': {'m': metadata, 'c': 1}},
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multi=False,
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upsert=True,
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manipulate=False)
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return not rst['updatedExisting']
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@utils.raises_conn_error
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def delete(self, name, project=None):
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self.driver.message_controller._purge_queue(name, project)
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self._col.remove({'p': project, 'n': name})
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@utils.raises_conn_error
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def stats(self, name, project=None):
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queue_id = self._get_id(name, project)
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controller = self.driver.message_controller
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active = controller.active(queue_id)
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claimed = controller.claimed(queue_id)
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return {
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'actions': 0,
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'messages': {
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'claimed': claimed.count(),
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'free': active.count(),
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}
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}
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@utils.raises_conn_error
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def actions(self, name, project=None, marker=None, limit=10):
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raise NotImplementedError
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