223 lines
6.6 KiB
Python
223 lines
6.6 KiB
Python
# Copyright (c) 2013 Rackspace, 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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import contextlib
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import sqlite3
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import uuid
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import msgpack
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from oslo.config import cfg
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from marconi.common import decorators
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from marconi.queues import storage
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from marconi.queues.storage.sqlite import controllers
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from marconi.queues.storage.sqlite import utils
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_SQLITE_OPTIONS = [
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cfg.StrOpt('database', default=':memory:',
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help='Sqlite database to use.')
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]
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_SQLITE_GROUP = 'drivers:storage:sqlite'
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class DataDriver(storage.DataDriverBase):
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def __init__(self, conf):
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super(DataDriver, self).__init__(conf)
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self.conf.register_opts(_SQLITE_OPTIONS, group=_SQLITE_GROUP)
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self.sqlite_conf = self.conf[_SQLITE_GROUP]
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self.__path = self.sqlite_conf.database
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# TODO(kgriffs): SHARDING - Make use of uri
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self.__conn = sqlite3.connect(self.__path,
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detect_types=sqlite3.PARSE_DECLTYPES)
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self.__db = self.__conn.cursor()
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self.run('''PRAGMA foreign_keys = ON''')
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self._ensure_tables()
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def _ensure_tables(self):
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"""Creates tables if they don't already exist."""
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# NOTE(kgriffs): Create tables all together rather
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# than separately in each controller, since some queries
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# in the individual controllers actually require the
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# presence of more than one table.
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self.run('''
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create table
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if not exists
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Messages (
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id INTEGER,
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qid INTEGER,
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ttl INTEGER,
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content DOCUMENT,
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client UUID,
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created DATETIME, -- seconds since the Julian day
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PRIMARY KEY(id),
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FOREIGN KEY(qid) references Queues(id) on delete cascade
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)
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''')
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self.run('''
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create table
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if not exists
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Queues (
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id INTEGER,
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project TEXT,
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name TEXT,
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metadata DOCUMENT,
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PRIMARY KEY(id),
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UNIQUE(project, name)
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)
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''')
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self.run('''
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create table
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if not exists
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Claims (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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qid INTEGER,
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ttl INTEGER,
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created DATETIME, -- seconds since the Julian day
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FOREIGN KEY(qid) references Queues(id) on delete cascade
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)
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''')
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self.run('''
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create table
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if not exists
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Locked (
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cid INTEGER,
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msgid INTEGER,
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FOREIGN KEY(cid) references Claims(id) on delete cascade,
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FOREIGN KEY(msgid) references Messages(id) on delete cascade
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)
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''')
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@staticmethod
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def pack(o):
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"""Converts a Python variable to a custom SQlite `DOCUMENT`.
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:param o: a Python str, unicode, int, long, float, bool, None
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or a dict or list of %o
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"""
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return sqlite3.Binary(msgpack.dumps(o))
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sqlite3.register_converter('DOCUMENT', lambda s:
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msgpack.loads(s, encoding='utf-8'))
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@staticmethod
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def uuid(o):
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"""Converts a UUID object to a custom SQlite `UUID`.
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:param o: a UUID object
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"""
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return sqlite3.Binary(o.bytes)
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sqlite3.register_converter('UUID', lambda s:
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uuid.UUID(hex=s))
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def run(self, sql, *args):
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"""Performs a SQL query.
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:param sql: a query string with the '?' placeholders
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:param args: the arguments to substitute the placeholders
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"""
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return self.__db.execute(sql, args)
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def run_multiple(self, sql, it):
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"""Iteratively perform multiple SQL queries.
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:param sql: a query string with the '?' placeholders
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:param it: an iterator which yields a sequence of arguments to
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substitute the placeholders
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"""
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self.__db.executemany(sql, it)
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def get(self, sql, *args):
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"""Runs %sql and returns the first entry in the results.
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:param sql: a query string with the '?' placeholders
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:param args: the arguments to substitute the placeholders
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:raises: utils.NoResult if the result set is empty
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"""
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try:
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return next(self.run(sql, *args))
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except StopIteration:
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raise utils.NoResult()
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@property
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def affected(self):
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"""Checks whether a row is affected in the last operation."""
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assert self.__db.rowcount in (0, 1)
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return self.__db.rowcount == 1
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@property
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def lastrowid(self):
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"""Returns the last inserted row id."""
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return self.__db.lastrowid
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@contextlib.contextmanager
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def __call__(self, isolation):
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self.run('begin ' + isolation)
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try:
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yield
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self.__conn.commit()
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except Exception:
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self.__conn.rollback()
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raise
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@decorators.lazy_property(write=False)
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def queue_controller(self):
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return controllers.QueueController(self)
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@decorators.lazy_property(write=False)
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def message_controller(self):
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return controllers.MessageController(self)
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@decorators.lazy_property(write=False)
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def claim_controller(self):
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return controllers.ClaimController(self)
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class ControlDriver(storage.ControlDriverBase):
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def __init__(self, conf):
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super(ControlDriver, self).__init__(conf)
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self.conf.register_opts(_SQLITE_OPTIONS, group=_SQLITE_GROUP)
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self.sqlite_conf = self.conf[_SQLITE_GROUP]
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self.__path = self.sqlite_conf.database
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# TODO(cpp-cabrera): implement this thing
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self.__conn = sqlite3.connect(self.__path,
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detect_types=sqlite3.PARSE_DECLTYPES)
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self.__db = self.__conn.cursor()
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@property
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def catalogue_controller(self):
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return controllers.CatalogueController(self)
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@property
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def shards_controller(self):
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return controllers.ShardsController(self)
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