root / pithos / backends / simple.py @ 58a6c894
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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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import os |
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import time |
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import sqlite3 |
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import logging |
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import types |
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import hashlib |
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import shutil |
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import pickle |
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from base import BaseBackend |
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logger = logging.getLogger(__name__) |
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class SimpleBackend(BaseBackend): |
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"""A simple backend.
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Uses SQLite for storage.
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"""
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# TODO: Automatic/manual clean-up after a time interval.
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def __init__(self, db): |
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self.hash_algorithm = 'sha1' |
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self.block_size = 128 * 1024 # 128KB |
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basepath = os.path.split(db)[0]
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if basepath and not os.path.exists(basepath): |
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os.makedirs(basepath) |
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self.con = sqlite3.connect(db)
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sql = '''create table if not exists versions (
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version_id integer primary key,
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name text,
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tstamp datetime default current_timestamp,
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size integer default 0,
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hide integer default 0)'''
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self.con.execute(sql)
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sql = '''create table if not exists metadata (
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version_id integer, key text, value text, primary key (version_id, key))'''
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self.con.execute(sql)
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sql = '''create table if not exists blocks (
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block_id text, data blob, primary key (block_id))'''
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self.con.execute(sql)
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sql = '''create table if not exists hashmaps (
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version_id integer, pos integer, block_id text, primary key (version_id, pos))'''
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self.con.execute(sql)
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self.con.commit()
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def delete_account(self, account): |
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"""Delete the account with the given name."""
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logger.debug("delete_account: %s", account)
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count, bytes, tstamp = self._get_pathstats(account) |
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if count > 0: |
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raise IndexError('Account is not empty') |
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self._del_path(account) # Point of no return. |
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def get_account_meta(self, account, until=None): |
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"""Return a dictionary with the account metadata."""
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logger.debug("get_account_meta: %s %s", account, until)
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try:
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version_id, mtime = self._get_accountinfo(account, until)
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except NameError: |
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version_id = None
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count, bytes, tstamp = self._get_pathstats(account, until) |
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if until is None: |
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modified = tstamp |
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else:
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modified = self._get_pathstats(account)[2] # Overall last modification |
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# Proper count.
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sql = 'select count(name) from (%s) where name glob ? and not name glob ?'
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sql = sql % self._sql_until(until)
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c = self.con.execute(sql, (account + '/*', account + '/*/*')) |
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row = c.fetchone() |
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count = row[0]
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meta = self._get_metadata(account, version_id)
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meta.update({'name': account, 'count': count, 'bytes': bytes}) |
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if modified:
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meta.update({'modified': modified})
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if until is not None: |
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meta.update({'until_timestamp': tstamp})
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return meta
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def update_account_meta(self, account, meta, replace=False): |
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"""Update the metadata associated with the account."""
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logger.debug("update_account_meta: %s %s %s", account, meta, replace)
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self._put_metadata(account, meta, replace)
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def list_containers(self, account, marker=None, limit=10000, until=None): |
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"""Return a list of containers existing under an account."""
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logger.debug("list_containers: %s %s %s %s", account, marker, limit, until)
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return self._list_objects(account, '', '/', marker, limit, False, [], until) |
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def put_container(self, account, container): |
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"""Create a new container with the given name."""
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logger.debug("put_container: %s %s", account, container)
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try:
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path, version_id, mtime = self._get_containerinfo(account, container)
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except NameError: |
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path = os.path.join(account, container) |
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version_id = self._put_version(path)
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else:
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raise NameError('Container already exists') |
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def delete_container(self, account, container): |
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"""Delete the container with the given name."""
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logger.debug("delete_container: %s %s", account, container)
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path, version_id, mtime = self._get_containerinfo(account, container)
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count, bytes, tstamp = self._get_pathstats(path) |
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if count > 0: |
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raise IndexError('Container is not empty') |
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self._del_path(path) # Point of no return. |
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self._copy_version(account, account, True, True) # New account version. |
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def get_container_meta(self, account, container, until=None): |
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"""Return a dictionary with the container metadata."""
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logger.debug("get_container_meta: %s %s %s", account, container, until)
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path, version_id, mtime = self._get_containerinfo(account, container, until)
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count, bytes, tstamp = self._get_pathstats(path, until) |
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if until is None: |
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modified = tstamp |
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else:
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modified = self._get_pathstats(account)[2] # Overall last modification |
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meta = self._get_metadata(path, version_id)
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meta.update({'name': container, 'count': count, 'bytes': bytes, 'modified': modified}) |
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if until is not None: |
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meta.update({'until_timestamp': tstamp})
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return meta
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def update_container_meta(self, account, container, meta, replace=False): |
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"""Update the metadata associated with the container."""
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logger.debug("update_container_meta: %s %s %s %s", account, container, meta, replace)
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path, version_id, mtime = self._get_containerinfo(account, container)
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self._put_metadata(path, meta, replace)
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def list_objects(self, account, container, prefix='', delimiter=None, marker=None, limit=10000, virtual=True, keys=[], until=None): |
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"""Return a list of objects existing under a container."""
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logger.debug("list_objects: %s %s %s %s %s %s %s", account, container, prefix, delimiter, marker, limit, until)
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path, version_id, mtime = self._get_containerinfo(account, container, until)
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return self._list_objects(path, prefix, delimiter, marker, limit, virtual, keys, until) |
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def list_object_meta(self, account, container, until=None): |
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"""Return a list with all the container's object meta keys."""
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logger.debug("list_object_meta: %s %s %s", account, container, until)
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path, version_id, mtime = self._get_containerinfo(account, container, until)
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sql = '''select distinct m.key from (%s) o, metadata m
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where m.version_id = o.version_id and o.name like ?'''
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sql = sql % self._sql_until(until)
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c = self.con.execute(sql, (path + '/%',)) |
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return [x[0] for x in c.fetchall()] |
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def get_object_meta(self, account, container, name, version=None): |
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"""Return a dictionary with the object metadata."""
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logger.debug("get_object_meta: %s %s %s %s", account, container, name, version)
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path, version_id, mtime, size = self._get_objectinfo(account, container, name, version)
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if version is None: |
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modified = mtime |
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else:
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modified = self._get_version(path)[1] # Overall last modification |
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meta = self._get_metadata(path, version_id)
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meta.update({'name': name, 'bytes': size, 'version': version_id, 'version_timestamp': mtime, 'modified': modified}) |
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return meta
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def update_object_meta(self, account, container, name, meta, replace=False): |
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"""Update the metadata associated with the object."""
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logger.debug("update_object_meta: %s %s %s %s %s", account, container, name, meta, replace)
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path, version_id, mtime, size = self._get_objectinfo(account, container, name)
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self._put_metadata(path, meta, replace)
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def get_object_hashmap(self, account, container, name, version=None): |
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"""Return the object's size and a list with partial hashes."""
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logger.debug("get_object_hashmap: %s %s %s %s", account, container, name, version)
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path, version_id, mtime, size = self._get_objectinfo(account, container, name, version)
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sql = 'select block_id from hashmaps where version_id = ? order by pos asc'
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c = self.con.execute(sql, (version_id,))
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hashmap = [x[0] for x in c.fetchall()] |
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return size, hashmap
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def update_object_hashmap(self, account, container, name, size, hashmap): |
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"""Create/update an object with the specified size and partial hashes."""
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logger.debug("update_object_hashmap: %s %s %s %s %s", account, container, name, size, hashmap)
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path = self._get_containerinfo(account, container)[0] |
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path = os.path.join(path, name) |
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src_version_id, dest_version_id = self._copy_version(path, path, True, False) |
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sql = 'update versions set size = ? where version_id = ?'
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self.con.execute(sql, (size, dest_version_id))
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# TODO: Check for block_id existence.
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for i in range(len(hashmap)): |
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sql = 'insert or replace into hashmaps (version_id, pos, block_id) values (?, ?, ?)'
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self.con.execute(sql, (dest_version_id, i, hashmap[i]))
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self.con.commit()
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def copy_object(self, account, src_container, src_name, dest_container, dest_name, dest_meta={}, replace_meta=False, src_version=None): |
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"""Copy an object's data and metadata."""
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logger.debug("copy_object: %s %s %s %s %s %s %s %s", account, src_container, src_name, dest_container, dest_name, dest_meta, replace_meta, src_version)
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if src_version is None: |
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src_path = self._get_objectinfo(account, src_container, src_name)[0] |
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else:
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src_path = os.path.join(account, src_container, src_name) |
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dest_path = self._get_containerinfo(account, dest_container)[0] |
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dest_path = os.path.join(dest_path, dest_name) |
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src_version_id, dest_version_id = self._copy_version(src_path, dest_path, not replace_meta, True, src_version) |
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for k, v in dest_meta.iteritems(): |
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sql = 'insert or replace into metadata (version_id, key, value) values (?, ?, ?)'
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self.con.execute(sql, (dest_version_id, k, v))
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self.con.commit()
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def move_object(self, account, src_container, src_name, dest_container, dest_name, dest_meta={}, replace_meta=False, src_version=None): |
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"""Move an object's data and metadata."""
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logger.debug("move_object: %s %s %s %s, %s %s %s %s", account, src_container, src_name, dest_container, dest_name, dest_meta, replace_meta, src_version)
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self.copy_object(account, src_container, src_name, dest_container, dest_name, dest_meta, replace_meta, src_version)
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self.delete_object(account, src_container, src_name)
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def delete_object(self, account, container, name): |
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"""Delete an object."""
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logger.debug("delete_object: %s %s %s", account, container, name)
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path, version_id, mtime, size = self._get_objectinfo(account, container, name)
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self._put_version(path, 0, 1) |
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def list_versions(self, account, container, name): |
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"""Return a list of version (version_id, version_modified) tuples for an object."""
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# This will even show deleted versions.
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path = os.path.join(account, container, name) |
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sql = '''select distinct version_id, strftime('%s', tstamp) from versions where name = ?'''
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c = self.con.execute(sql, (path,))
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return [(str(x[0]), int(x[1])) for x in c.fetchall()] |
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def get_block(self, hash): |
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"""Return a block's data."""
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logger.debug("get_block: %s", hash) |
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c = self.con.execute('select data from blocks where block_id = ?', (hash,)) |
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row = c.fetchone() |
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if row:
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return str(row[0]) |
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else:
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raise NameError('Block does not exist') |
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def put_block(self, data): |
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"""Create a block and return the hash."""
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logger.debug("put_block: %s", len(data)) |
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h = hashlib.new(self.hash_algorithm)
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h.update(data.rstrip('\x00'))
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hash = h.hexdigest() |
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sql = 'insert or ignore into blocks (block_id, data) values (?, ?)'
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self.con.execute(sql, (hash, buffer(data))) |
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self.con.commit()
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return hash |
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def update_block(self, hash, data, offset=0): |
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"""Update a known block and return the hash."""
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logger.debug("update_block: %s %s %s", hash, len(data), offset) |
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if offset == 0 and len(data) == self.block_size: |
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return self.put_block(data) |
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src_data = self.get_block(hash) |
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bs = self.block_size
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if offset < 0 or offset > bs or offset + len(data) > bs: |
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raise IndexError('Offset or data outside block limits') |
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dest_data = src_data[:offset] + data + src_data[offset + len(data):]
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return self.put_block(dest_data) |
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def _sql_until(self, until=None): |
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"""Return the sql to get the latest versions until the timestamp given."""
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if until is None: |
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until = int(time.time())
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sql = '''select version_id, name, strftime('%s', tstamp) as tstamp, size from versions v
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where version_id = (select max(version_id) from versions
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where v.name = name and tstamp <= datetime(%s, 'unixepoch'))
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and hide = 0'''
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return sql % ('%s', until) |
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def _get_pathstats(self, path, until=None): |
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"""Return count and sum of size of everything under path and latest timestamp."""
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sql = 'select count(version_id), total(size), max(tstamp) from (%s) where name like ?'
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sql = sql % self._sql_until(until)
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c = self.con.execute(sql, (path + '/%',)) |
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row = c.fetchone() |
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tstamp = row[2] if row[2] is not None else 0 |
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return int(row[0]), int(row[1]), int(tstamp) |
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def _get_version(self, path, version=None): |
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if version is None: |
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sql = '''select version_id, strftime('%s', tstamp), size, hide from versions where name = ?
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order by version_id desc limit 1'''
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c = self.con.execute(sql, (path,))
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row = c.fetchone() |
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if not row or int(row[3]): |
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raise NameError('Object does not exist') |
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else:
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sql = '''select version_id, strftime('%s', tstamp), size from versions where name = ?
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and version_id = ?'''
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c = self.con.execute(sql, (path, version))
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row = c.fetchone() |
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if not row: |
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raise IndexError('Version does not exist') |
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return str(row[0]), int(row[1]), int(row[2]) |
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def _put_version(self, path, size=0, hide=0): |
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sql = 'insert into versions (name, size, hide) values (?, ?, ?)'
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id = self.con.execute(sql, (path, size, hide)).lastrowid
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self.con.commit()
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return str(id) |
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def _copy_version(self, src_path, dest_path, copy_meta=True, copy_data=True, src_version=None): |
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if src_version is not None: |
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src_version_id, mtime, size = self._get_version(src_path, src_version)
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else:
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# Latest or create from scratch.
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try:
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src_version_id, mtime, size = self._get_version(src_path)
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except NameError: |
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src_version_id = None
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size = 0
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if not copy_data: |
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size = 0
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dest_version_id = self._put_version(dest_path, size)
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if copy_meta and src_version_id is not None: |
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sql = 'insert into metadata select %s, key, value from metadata where version_id = ?'
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sql = sql % dest_version_id |
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self.con.execute(sql, (src_version_id,))
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if copy_data and src_version_id is not None: |
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sql = 'insert into hashmaps select %s, pos, block_id from hashmaps where version_id = ?'
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sql = sql % dest_version_id |
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self.con.execute(sql, (src_version_id,))
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self.con.commit()
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return src_version_id, dest_version_id
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def _get_versioninfo(self, account, container, name, until=None): |
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"""Return path, latest version, associated timestamp and size until the timestamp given."""
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p = (account, container, name) |
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try:
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p = p[:p.index(None)]
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except ValueError: |
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pass
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path = os.path.join(*p) |
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sql = '''select version_id, tstamp, size from (%s) where name = ?'''
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sql = sql % self._sql_until(until)
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c = self.con.execute(sql, (path,))
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row = c.fetchone() |
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if row is None: |
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raise NameError('Path does not exist') |
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return path, str(row[0]), int(row[1]), int(row[2]) |
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|
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def _get_accountinfo(self, account, until=None): |
406 |
try:
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path, version_id, mtime, size = self._get_versioninfo(account, None, None, until) |
408 |
return version_id, mtime
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except:
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raise NameError('Account does not exist') |
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|
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def _get_containerinfo(self, account, container, until=None): |
413 |
try:
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path, version_id, mtime, size = self._get_versioninfo(account, container, None, until) |
415 |
return path, version_id, mtime
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except:
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raise NameError('Container does not exist') |
418 |
|
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def _get_objectinfo(self, account, container, name, version=None): |
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path = os.path.join(account, container, name) |
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version_id, mtime, size = self._get_version(path, version)
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return path, version_id, mtime, size
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|
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def _get_metadata(self, path, version): |
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sql = 'select key, value from metadata where version_id = ?'
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c = self.con.execute(sql, (version,))
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return dict(c.fetchall()) |
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|
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def _put_metadata(self, path, meta, replace=False): |
430 |
"""Create a new version and store metadata."""
|
431 |
|
432 |
src_version_id, dest_version_id = self._copy_version(path, path, not replace, True) |
433 |
for k, v in meta.iteritems(): |
434 |
sql = 'insert or replace into metadata (version_id, key, value) values (?, ?, ?)'
|
435 |
self.con.execute(sql, (dest_version_id, k, v))
|
436 |
self.con.commit()
|
437 |
|
438 |
def _list_objects(self, path, prefix='', delimiter=None, marker=None, limit=10000, virtual=True, keys=[], until=None): |
439 |
cont_prefix = path + '/'
|
440 |
if keys and len(keys) > 0: |
441 |
sql = '''select distinct o.name, o.version_id from (%s) o, metadata m where o.name like ? and
|
442 |
m.version_id = o.version_id and m.key in (%s) order by o.name'''
|
443 |
sql = sql % (self._sql_until(until), ', '.join('?' * len(keys))) |
444 |
param = (cont_prefix + prefix + '%',) + tuple(keys) |
445 |
else:
|
446 |
sql = 'select name, version_id from (%s) where name like ? order by name'
|
447 |
sql = sql % self._sql_until(until)
|
448 |
param = (cont_prefix + prefix + '%',)
|
449 |
c = self.con.execute(sql, param)
|
450 |
objects = [(x[0][len(cont_prefix):], x[1]) for x in c.fetchall()] |
451 |
if delimiter:
|
452 |
pseudo_objects = [] |
453 |
for x in objects: |
454 |
pseudo_name = x[0]
|
455 |
i = pseudo_name.find(delimiter, len(prefix))
|
456 |
if not virtual: |
457 |
# If the delimiter is not found, or the name ends
|
458 |
# with the delimiter's first occurence.
|
459 |
if i == -1 or len(pseudo_name) == i + len(delimiter): |
460 |
pseudo_objects.append(x) |
461 |
else:
|
462 |
# If the delimiter is found, keep up to (and including) the delimiter.
|
463 |
if i != -1: |
464 |
pseudo_name = pseudo_name[:i + len(delimiter)]
|
465 |
if pseudo_name not in [y[0] for y in pseudo_objects]: |
466 |
pseudo_objects.append((pseudo_name, x[1]))
|
467 |
objects = pseudo_objects |
468 |
|
469 |
start = 0
|
470 |
if marker:
|
471 |
try:
|
472 |
start = [x[0] for x in objects].index(marker) + 1 |
473 |
except ValueError: |
474 |
pass
|
475 |
if not limit or limit > 10000: |
476 |
limit = 10000
|
477 |
return objects[start:start + limit]
|
478 |
|
479 |
def _del_path(self, path): |
480 |
sql = '''delete from hashmaps where version_id in
|
481 |
(select version_id from versions where name = ?)'''
|
482 |
self.con.execute(sql, (path,))
|
483 |
sql = '''delete from metadata where version_id in
|
484 |
(select version_id from versions where name = ?)'''
|
485 |
self.con.execute(sql, (path,))
|
486 |
sql = '''delete from versions where name = ?'''
|
487 |
self.con.execute(sql, (path,))
|
488 |
self.con.commit()
|