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# RhodeCode VCSServer provides access to different vcs backends via network.
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# Copyright (C) 2014-2024 RhodeCode GmbH
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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import codecs
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import contextlib
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import functools
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import os
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import logging
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import time
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import typing
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import zlib
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import sqlite3
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from vcsserver.lib.rc_json import json
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from .lock import GenerationLock
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log = logging.getLogger(__name__)
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cache_meta = None
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UNKNOWN = -241
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NO_VAL = -917
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MODE_BINARY = 'BINARY'
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EVICTION_POLICY = {
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'none': {
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'evict': None,
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},
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'least-recently-stored': {
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'evict': 'SELECT {fields} FROM archive_cache ORDER BY store_time',
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},
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'least-recently-used': {
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'evict': 'SELECT {fields} FROM archive_cache ORDER BY access_time',
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},
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'least-frequently-used': {
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'evict': 'SELECT {fields} FROM archive_cache ORDER BY access_count',
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},
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}
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class DB:
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def __init__(self):
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self.connection = sqlite3.connect(':memory:')
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self._init_db()
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def _init_db(self):
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qry = '''
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CREATE TABLE IF NOT EXISTS archive_cache (
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rowid INTEGER PRIMARY KEY,
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key_file TEXT,
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key_file_path TEXT,
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filename TEXT,
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full_path TEXT,
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store_time REAL,
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access_time REAL,
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access_count INTEGER DEFAULT 0,
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size INTEGER DEFAULT 0
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)
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'''
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self.sql(qry)
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self.connection.commit()
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@property
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def sql(self):
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return self.connection.execute
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def bulk_insert(self, rows):
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qry = '''
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INSERT INTO archive_cache (
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rowid,
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key_file,
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key_file_path,
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filename,
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full_path,
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store_time,
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access_time,
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access_count,
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size
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)
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VALUES (
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?, ?, ?, ?, ?, ?, ?, ?, ?
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)
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'''
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cursor = self.connection.cursor()
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cursor.executemany(qry, rows)
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self.connection.commit()
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class FileSystemCache:
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def __init__(self, index, directory, **settings):
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self._index = index
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self._directory = directory
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def _write_file(self, full_path, iterator, mode, encoding=None):
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full_dir, _ = os.path.split(full_path)
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for count in range(1, 11):
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with contextlib.suppress(OSError):
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os.makedirs(full_dir)
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try:
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# Another cache may have deleted the directory before
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# the file could be opened.
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writer = open(full_path, mode, encoding=encoding)
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except OSError:
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if count == 10:
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# Give up after 10 tries to open the file.
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raise
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continue
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with writer:
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size = 0
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for chunk in iterator:
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size += len(chunk)
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writer.write(chunk)
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return size
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def _get_keyfile(self, key):
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return os.path.join(self._directory, f'{key}.key')
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def store(self, key, value_reader, metadata):
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filename, full_path = self.random_filename()
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key_file = self._get_keyfile(key)
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# STORE METADATA
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_metadata = {
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"version": "v1",
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"filename": filename,
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"full_path": full_path,
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"key_file": key_file,
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"store_time": time.time(),
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"access_count": 1,
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"access_time": 0,
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"size": 0
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}
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if metadata:
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_metadata.update(metadata)
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reader = functools.partial(value_reader.read, 2**22)
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iterator = iter(reader, b'')
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size = self._write_file(full_path, iterator, 'xb')
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metadata['size'] = size
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# after archive is finished, we create a key to save the presence of the binary file
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with open(key_file, 'wb') as f:
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f.write(json.dumps(_metadata))
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return key, size, MODE_BINARY, filename, _metadata
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def fetch(self, key) -> tuple[typing.BinaryIO, dict]:
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if key not in self:
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raise KeyError(key)
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key_file = self._get_keyfile(key)
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with open(key_file, 'rb') as f:
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metadata = json.loads(f.read())
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filename = metadata['filename']
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try:
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return open(os.path.join(self._directory, filename), 'rb'), metadata
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finally:
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# update usage stats, count and accessed
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metadata["access_count"] = metadata.get("access_count", 0) + 1
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metadata["access_time"] = time.time()
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with open(key_file, 'wb') as f:
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f.write(json.dumps(metadata))
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def random_filename(self):
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"""Return filename and full-path tuple for file storage.
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Filename will be a randomly generated 28 character hexadecimal string
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with ".archive_cache" suffixed. Two levels of sub-directories will be used to
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reduce the size of directories. On older filesystems, lookups in
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directories with many files may be slow.
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"""
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hex_name = codecs.encode(os.urandom(16), 'hex').decode('utf-8')
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sub_dir = os.path.join(hex_name[:2], hex_name[2:4])
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name = hex_name[4:] + '.archive_cache'
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filename = os.path.join(sub_dir, name)
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full_path = os.path.join(self._directory, filename)
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return filename, full_path
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def hash(self, key):
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"""Compute portable hash for `key`.
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:param key: key to hash
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:return: hash value
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"""
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mask = 0xFFFFFFFF
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return zlib.adler32(key.encode('utf-8')) & mask # noqa
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def __contains__(self, key):
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"""Return `True` if `key` matching item is found in cache.
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:param key: key matching item
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:return: True if key matching item
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"""
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key_file = self._get_keyfile(key)
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return os.path.exists(key_file)
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class FanoutCache:
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"""Cache that shards keys and values."""
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def __init__(
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self, directory=None, **settings
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):
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"""Initialize cache instance.
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:param str directory: cache directory
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:param settings: settings dict
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"""
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if directory is None:
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raise ValueError('directory cannot be None')
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directory = str(directory)
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directory = os.path.expanduser(directory)
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directory = os.path.expandvars(directory)
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self._directory = directory
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self._count = settings.pop('cache_shards')
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self._locking_url = settings.pop('locking_url')
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self._eviction_policy = settings['cache_eviction_policy']
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self._cache_size_limit = settings['cache_size_limit']
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self._shards = tuple(
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FileSystemCache(
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index=num,
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directory=os.path.join(directory, 'shard_%03d' % num),
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**settings,
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)
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for num in range(self._count)
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)
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self._hash = self._shards[0].hash
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def get_lock(self, lock_key):
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return GenerationLock(lock_key, self._locking_url)
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def _get_shard(self, key) -> FileSystemCache:
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index = self._hash(key) % self._count
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shard = self._shards[index]
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return shard
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def store(self, key, value_reader, metadata=None):
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shard = self._get_shard(key)
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return shard.store(key, value_reader, metadata)
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def fetch(self, key):
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"""Return file handle corresponding to `key` from cache.
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"""
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shard = self._get_shard(key)
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return shard.fetch(key)
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def has_key(self, key):
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"""Return `True` if `key` matching item is found in cache.
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:param key: key for item
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:return: True if key is found
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"""
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shard = self._get_shard(key)
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return key in shard
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def __contains__(self, item):
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return self.has_key(item)
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def evict(self, policy=None, size_limit=None):
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"""
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Remove old items based on the conditions
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explanation of this algo:
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iterate over each shard, then for each shard iterate over the .key files
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read the key files metadata stored. This gives us a full list of keys, cached_archived, their size and
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access data, time creation, and access counts.
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Store that into a memory DB so we can run different sorting strategies easily.
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Summing the size is a sum sql query.
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Then we run a sorting strategy based on eviction policy.
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We iterate over sorted keys, and remove each checking if we hit the overall limit.
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"""
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policy = policy or self._eviction_policy
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size_limit = size_limit or self._cache_size_limit
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select_policy = EVICTION_POLICY[policy]['evict']
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if select_policy is None:
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return 0
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db = DB()
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data = []
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cnt = 1
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for shard in self._shards:
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for key_file in os.listdir(shard._directory):
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if key_file.endswith('.key'):
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key_file_path = os.path.join(shard._directory, key_file)
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with open(key_file_path, 'rb') as f:
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metadata = json.loads(f.read())
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# in case we don't have size re-calc it...
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if not metadata.get('size'):
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fn = metadata.get('full_path')
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size = os.stat(fn).st_size
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data.append([
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cnt,
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key_file,
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key_file_path,
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metadata.get('filename'),
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metadata.get('full_path'),
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metadata.get('store_time', 0),
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metadata.get('access_time', 0),
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metadata.get('access_count', 0),
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metadata.get('size', size),
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])
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cnt += 1
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# Insert bulk data using executemany
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db.bulk_insert(data)
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((total_size,),) = db.sql('SELECT COALESCE(SUM(size), 0) FROM archive_cache').fetchall()
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select_policy_qry = select_policy.format(fields='key_file_path, full_path, size')
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sorted_keys = db.sql(select_policy_qry).fetchall()
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for key, cached_file, size in sorted_keys:
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# simulate removal impact BEFORE removal
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total_size -= size
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if total_size <= size_limit:
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# we obtained what we wanted...
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break
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os.remove(cached_file)
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os.remove(key)
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return
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def get_archival_config(config):
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final_config = {
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}
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for k, v in config.items():
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if k.startswith('archive_cache'):
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final_config[k] = v
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return final_config
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def get_archival_cache_store(config):
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global cache_meta
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if cache_meta is not None:
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return cache_meta
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config = get_archival_config(config)
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backend = config['archive_cache.backend.type']
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if backend != 'filesystem':
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raise ValueError('archive_cache.backend.type only supports "filesystem"')
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archive_cache_locking_url = config['archive_cache.locking.url']
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archive_cache_dir = config['archive_cache.filesystem.store_dir']
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archive_cache_size_gb = config['archive_cache.filesystem.cache_size_gb']
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archive_cache_shards = config['archive_cache.filesystem.cache_shards']
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archive_cache_eviction_policy = config['archive_cache.filesystem.eviction_policy']
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log.debug('Initializing archival cache instance under %s', archive_cache_dir)
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# check if it's ok to write, and re-create the archive cache
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if not os.path.isdir(archive_cache_dir):
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os.makedirs(archive_cache_dir, exist_ok=True)
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d_cache = FanoutCache(
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archive_cache_dir,
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locking_url=archive_cache_locking_url,
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cache_shards=archive_cache_shards,
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cache_size_limit=archive_cache_size_gb * 1024 * 1024 * 1024,
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cache_eviction_policy=archive_cache_eviction_policy
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)
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cache_meta = d_cache
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return cache_meta
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