mirror of
https://github.com/moparisthebest/SickRage
synced 2024-11-13 21:05:11 -05:00
520 lines
15 KiB
Python
520 lines
15 KiB
Python
# -*- coding: utf-8 -*-
|
|
'''Common object storage frontend.'''
|
|
|
|
import os
|
|
import zlib
|
|
import urllib
|
|
try:
|
|
import cPickle as pickle
|
|
except ImportError:
|
|
import pickle
|
|
from collections import deque
|
|
|
|
try:
|
|
# Import store and cache entry points if setuptools installed
|
|
import pkg_resources
|
|
stores = dict((_store.name, _store) for _store in
|
|
pkg_resources.iter_entry_points('shove.stores'))
|
|
caches = dict((_cache.name, _cache) for _cache in
|
|
pkg_resources.iter_entry_points('shove.caches'))
|
|
# Pass if nothing loaded
|
|
if not stores and not caches:
|
|
raise ImportError()
|
|
except ImportError:
|
|
# Static store backend registry
|
|
stores = dict(
|
|
bsddb='shove.store.bsdb:BsdStore',
|
|
cassandra='shove.store.cassandra:CassandraStore',
|
|
dbm='shove.store.dbm:DbmStore',
|
|
durus='shove.store.durusdb:DurusStore',
|
|
file='shove.store.file:FileStore',
|
|
firebird='shove.store.db:DbStore',
|
|
ftp='shove.store.ftp:FtpStore',
|
|
hdf5='shove.store.hdf5:HDF5Store',
|
|
leveldb='shove.store.leveldbstore:LevelDBStore',
|
|
memory='shove.store.memory:MemoryStore',
|
|
mssql='shove.store.db:DbStore',
|
|
mysql='shove.store.db:DbStore',
|
|
oracle='shove.store.db:DbStore',
|
|
postgres='shove.store.db:DbStore',
|
|
redis='shove.store.redisdb:RedisStore',
|
|
s3='shove.store.s3:S3Store',
|
|
simple='shove.store.simple:SimpleStore',
|
|
sqlite='shove.store.db:DbStore',
|
|
svn='shove.store.svn:SvnStore',
|
|
zodb='shove.store.zodb:ZodbStore',
|
|
)
|
|
# Static cache backend registry
|
|
caches = dict(
|
|
bsddb='shove.cache.bsdb:BsdCache',
|
|
file='shove.cache.file:FileCache',
|
|
filelru='shove.cache.filelru:FileLRUCache',
|
|
firebird='shove.cache.db:DbCache',
|
|
memcache='shove.cache.memcached:MemCached',
|
|
memlru='shove.cache.memlru:MemoryLRUCache',
|
|
memory='shove.cache.memory:MemoryCache',
|
|
mssql='shove.cache.db:DbCache',
|
|
mysql='shove.cache.db:DbCache',
|
|
oracle='shove.cache.db:DbCache',
|
|
postgres='shove.cache.db:DbCache',
|
|
redis='shove.cache.redisdb:RedisCache',
|
|
simple='shove.cache.simple:SimpleCache',
|
|
simplelru='shove.cache.simplelru:SimpleLRUCache',
|
|
sqlite='shove.cache.db:DbCache',
|
|
)
|
|
|
|
|
|
def getbackend(uri, engines, **kw):
|
|
'''
|
|
Loads the right backend based on a URI.
|
|
|
|
@param uri Instance or name string
|
|
@param engines A dictionary of scheme/class pairs
|
|
'''
|
|
if isinstance(uri, basestring):
|
|
mod = engines[uri.split('://', 1)[0]]
|
|
# Load module if setuptools not present
|
|
if isinstance(mod, basestring):
|
|
# Isolate classname from dot path
|
|
module, klass = mod.split(':')
|
|
# Load module
|
|
mod = getattr(__import__(module, '', '', ['']), klass)
|
|
# Load appropriate class from setuptools entry point
|
|
else:
|
|
mod = mod.load()
|
|
# Return instance
|
|
return mod(uri, **kw)
|
|
# No-op for existing instances
|
|
return uri
|
|
|
|
|
|
def synchronized(func):
|
|
'''
|
|
Decorator to lock and unlock a method (Phillip J. Eby).
|
|
|
|
@param func Method to decorate
|
|
'''
|
|
def wrapper(self, *__args, **__kw):
|
|
self._lock.acquire()
|
|
try:
|
|
return func(self, *__args, **__kw)
|
|
finally:
|
|
self._lock.release()
|
|
wrapper.__name__ = func.__name__
|
|
wrapper.__dict__ = func.__dict__
|
|
wrapper.__doc__ = func.__doc__
|
|
return wrapper
|
|
|
|
|
|
class Base(object):
|
|
|
|
'''Base Mapping class.'''
|
|
|
|
def __init__(self, engine, **kw):
|
|
'''
|
|
@keyword compress True, False, or an integer compression level (1-9).
|
|
'''
|
|
self._compress = kw.get('compress', False)
|
|
self._protocol = kw.get('protocol', pickle.HIGHEST_PROTOCOL)
|
|
|
|
def __getitem__(self, key):
|
|
raise NotImplementedError()
|
|
|
|
def __setitem__(self, key, value):
|
|
raise NotImplementedError()
|
|
|
|
def __delitem__(self, key):
|
|
raise NotImplementedError()
|
|
|
|
def __contains__(self, key):
|
|
try:
|
|
value = self[key]
|
|
except KeyError:
|
|
return False
|
|
return True
|
|
|
|
def get(self, key, default=None):
|
|
'''
|
|
Fetch a given key from the mapping. If the key does not exist,
|
|
return the default.
|
|
|
|
@param key Keyword of item in mapping.
|
|
@param default Default value (default: None)
|
|
'''
|
|
try:
|
|
return self[key]
|
|
except KeyError:
|
|
return default
|
|
|
|
def dumps(self, value):
|
|
'''Optionally serializes and compresses an object.'''
|
|
# Serialize everything but ASCII strings
|
|
value = pickle.dumps(value, protocol=self._protocol)
|
|
if self._compress:
|
|
level = 9 if self._compress is True else self._compress
|
|
value = zlib.compress(value, level)
|
|
return value
|
|
|
|
def loads(self, value):
|
|
'''Deserializes and optionally decompresses an object.'''
|
|
if self._compress:
|
|
try:
|
|
value = zlib.decompress(value)
|
|
except zlib.error:
|
|
pass
|
|
value = pickle.loads(value)
|
|
return value
|
|
|
|
|
|
class BaseStore(Base):
|
|
|
|
'''Base Store class (based on UserDict.DictMixin).'''
|
|
|
|
def __init__(self, engine, **kw):
|
|
super(BaseStore, self).__init__(engine, **kw)
|
|
self._store = None
|
|
|
|
def __cmp__(self, other):
|
|
if other is None:
|
|
return False
|
|
if isinstance(other, BaseStore):
|
|
return cmp(dict(self.iteritems()), dict(other.iteritems()))
|
|
|
|
def __del__(self):
|
|
# __init__ didn't succeed, so don't bother closing
|
|
if not hasattr(self, '_store'):
|
|
return
|
|
self.close()
|
|
|
|
def __iter__(self):
|
|
for k in self.keys():
|
|
yield k
|
|
|
|
def __len__(self):
|
|
return len(self.keys())
|
|
|
|
def __repr__(self):
|
|
return repr(dict(self.iteritems()))
|
|
|
|
def close(self):
|
|
'''Closes internal store and clears object references.'''
|
|
try:
|
|
self._store.close()
|
|
except AttributeError:
|
|
pass
|
|
self._store = None
|
|
|
|
def clear(self):
|
|
'''Removes all keys and values from a store.'''
|
|
for key in self.keys():
|
|
del self[key]
|
|
|
|
def items(self):
|
|
'''Returns a list with all key/value pairs in the store.'''
|
|
return list(self.iteritems())
|
|
|
|
def iteritems(self):
|
|
'''Lazily returns all key/value pairs in a store.'''
|
|
for k in self:
|
|
yield (k, self[k])
|
|
|
|
def iterkeys(self):
|
|
'''Lazy returns all keys in a store.'''
|
|
return self.__iter__()
|
|
|
|
def itervalues(self):
|
|
'''Lazily returns all values in a store.'''
|
|
for _, v in self.iteritems():
|
|
yield v
|
|
|
|
def keys(self):
|
|
'''Returns a list with all keys in a store.'''
|
|
raise NotImplementedError()
|
|
|
|
def pop(self, key, *args):
|
|
'''
|
|
Removes and returns a value from a store.
|
|
|
|
@param args Default to return if key not present.
|
|
'''
|
|
if len(args) > 1:
|
|
raise TypeError('pop expected at most 2 arguments, got ' + repr(
|
|
1 + len(args))
|
|
)
|
|
try:
|
|
value = self[key]
|
|
# Return default if key not in store
|
|
except KeyError:
|
|
if args:
|
|
return args[0]
|
|
del self[key]
|
|
return value
|
|
|
|
def popitem(self):
|
|
'''Removes and returns a key, value pair from a store.'''
|
|
try:
|
|
k, v = self.iteritems().next()
|
|
except StopIteration:
|
|
raise KeyError('Store is empty.')
|
|
del self[k]
|
|
return (k, v)
|
|
|
|
def setdefault(self, key, default=None):
|
|
'''
|
|
Returns the value corresponding to an existing key or sets the
|
|
to key to the default and returns the default.
|
|
|
|
@param default Default value (default: None)
|
|
'''
|
|
try:
|
|
return self[key]
|
|
except KeyError:
|
|
self[key] = default
|
|
return default
|
|
|
|
def update(self, other=None, **kw):
|
|
'''
|
|
Adds to or overwrites the values in this store with values from
|
|
another store.
|
|
|
|
other Another store
|
|
kw Additional keys and values to store
|
|
'''
|
|
if other is None:
|
|
pass
|
|
elif hasattr(other, 'iteritems'):
|
|
for k, v in other.iteritems():
|
|
self[k] = v
|
|
elif hasattr(other, 'keys'):
|
|
for k in other.keys():
|
|
self[k] = other[k]
|
|
else:
|
|
for k, v in other:
|
|
self[k] = v
|
|
if kw:
|
|
self.update(kw)
|
|
|
|
def values(self):
|
|
'''Returns a list with all values in a store.'''
|
|
return list(v for _, v in self.iteritems())
|
|
|
|
|
|
class Shove(BaseStore):
|
|
|
|
'''Common object frontend class.'''
|
|
|
|
def __init__(self, store='simple://', cache='simple://', **kw):
|
|
super(Shove, self).__init__(store, **kw)
|
|
# Load store
|
|
self._store = getbackend(store, stores, **kw)
|
|
# Load cache
|
|
self._cache = getbackend(cache, caches, **kw)
|
|
# Buffer for lazy writing and setting for syncing frequency
|
|
self._buffer, self._sync = dict(), kw.get('sync', 2)
|
|
|
|
def __getitem__(self, key):
|
|
'''Gets a item from shove.'''
|
|
try:
|
|
return self._cache[key]
|
|
except KeyError:
|
|
# Synchronize cache and store
|
|
self.sync()
|
|
value = self._store[key]
|
|
self._cache[key] = value
|
|
return value
|
|
|
|
def __setitem__(self, key, value):
|
|
'''Sets an item in shove.'''
|
|
self._cache[key] = self._buffer[key] = value
|
|
# When the buffer reaches self._limit, writes the buffer to the store
|
|
if len(self._buffer) >= self._sync:
|
|
self.sync()
|
|
|
|
def __delitem__(self, key):
|
|
'''Deletes an item from shove.'''
|
|
try:
|
|
del self._cache[key]
|
|
except KeyError:
|
|
pass
|
|
self.sync()
|
|
del self._store[key]
|
|
|
|
def keys(self):
|
|
'''Returns a list of keys in shove.'''
|
|
self.sync()
|
|
return self._store.keys()
|
|
|
|
def sync(self):
|
|
'''Writes buffer to store.'''
|
|
for k, v in self._buffer.iteritems():
|
|
self._store[k] = v
|
|
self._buffer.clear()
|
|
|
|
def close(self):
|
|
'''Finalizes and closes shove.'''
|
|
# If close has been called, pass
|
|
if self._store is not None:
|
|
try:
|
|
self.sync()
|
|
except AttributeError:
|
|
pass
|
|
self._store.close()
|
|
self._store = self._cache = self._buffer = None
|
|
|
|
|
|
class FileBase(Base):
|
|
|
|
'''Base class for file based storage.'''
|
|
|
|
def __init__(self, engine, **kw):
|
|
super(FileBase, self).__init__(engine, **kw)
|
|
if engine.startswith('file://'):
|
|
engine = urllib.url2pathname(engine.split('://')[1])
|
|
self._dir = engine
|
|
# Create directory
|
|
if not os.path.exists(self._dir):
|
|
self._createdir()
|
|
|
|
def __getitem__(self, key):
|
|
# (per Larry Meyn)
|
|
try:
|
|
item = open(self._key_to_file(key), 'rb')
|
|
data = item.read()
|
|
item.close()
|
|
return self.loads(data)
|
|
except:
|
|
raise KeyError(key)
|
|
|
|
def __setitem__(self, key, value):
|
|
# (per Larry Meyn)
|
|
try:
|
|
item = open(self._key_to_file(key), 'wb')
|
|
item.write(self.dumps(value))
|
|
item.close()
|
|
except (IOError, OSError):
|
|
raise KeyError(key)
|
|
|
|
def __delitem__(self, key):
|
|
try:
|
|
os.remove(self._key_to_file(key))
|
|
except (IOError, OSError):
|
|
raise KeyError(key)
|
|
|
|
def __contains__(self, key):
|
|
return os.path.exists(self._key_to_file(key))
|
|
|
|
def __len__(self):
|
|
return len(os.listdir(self._dir))
|
|
|
|
def _createdir(self):
|
|
'''Creates the store directory.'''
|
|
try:
|
|
os.makedirs(self._dir)
|
|
except OSError:
|
|
raise EnvironmentError(
|
|
'Cache directory "%s" does not exist and ' \
|
|
'could not be created' % self._dir
|
|
)
|
|
|
|
def _key_to_file(self, key):
|
|
'''Gives the filesystem path for a key.'''
|
|
return os.path.join(self._dir, urllib.quote_plus(key))
|
|
|
|
def keys(self):
|
|
'''Returns a list of keys in the store.'''
|
|
return [urllib.unquote_plus(name) for name in os.listdir(self._dir)]
|
|
|
|
|
|
class SimpleBase(Base):
|
|
|
|
'''Single-process in-memory store base class.'''
|
|
|
|
def __init__(self, engine, **kw):
|
|
super(SimpleBase, self).__init__(engine, **kw)
|
|
self._store = dict()
|
|
|
|
def __getitem__(self, key):
|
|
try:
|
|
return self._store[key]
|
|
except:
|
|
raise KeyError(key)
|
|
|
|
def __setitem__(self, key, value):
|
|
self._store[key] = value
|
|
|
|
def __delitem__(self, key):
|
|
try:
|
|
del self._store[key]
|
|
except:
|
|
raise KeyError(key)
|
|
|
|
def __len__(self):
|
|
return len(self._store)
|
|
|
|
def keys(self):
|
|
'''Returns a list of keys in the store.'''
|
|
return self._store.keys()
|
|
|
|
|
|
class LRUBase(SimpleBase):
|
|
|
|
def __init__(self, engine, **kw):
|
|
super(LRUBase, self).__init__(engine, **kw)
|
|
self._max_entries = kw.get('max_entries', 300)
|
|
self._hits = 0
|
|
self._misses = 0
|
|
self._queue = deque()
|
|
self._refcount = dict()
|
|
|
|
def __getitem__(self, key):
|
|
try:
|
|
value = super(LRUBase, self).__getitem__(key)
|
|
self._hits += 1
|
|
except KeyError:
|
|
self._misses += 1
|
|
raise
|
|
self._housekeep(key)
|
|
return value
|
|
|
|
def __setitem__(self, key, value):
|
|
super(LRUBase, self).__setitem__(key, value)
|
|
self._housekeep(key)
|
|
if len(self._store) > self._max_entries:
|
|
while len(self._store) > self._max_entries:
|
|
k = self._queue.popleft()
|
|
self._refcount[k] -= 1
|
|
if not self._refcount[k]:
|
|
super(LRUBase, self).__delitem__(k)
|
|
del self._refcount[k]
|
|
|
|
def _housekeep(self, key):
|
|
self._queue.append(key)
|
|
self._refcount[key] = self._refcount.get(key, 0) + 1
|
|
if len(self._queue) > self._max_entries * 4:
|
|
self._purge_queue()
|
|
|
|
def _purge_queue(self):
|
|
for i in [None] * len(self._queue):
|
|
k = self._queue.popleft()
|
|
if self._refcount[k] == 1:
|
|
self._queue.append(k)
|
|
else:
|
|
self._refcount[k] -= 1
|
|
|
|
|
|
class DbBase(Base):
|
|
|
|
'''Database common base class.'''
|
|
|
|
def __init__(self, engine, **kw):
|
|
super(DbBase, self).__init__(engine, **kw)
|
|
|
|
def __delitem__(self, key):
|
|
self._store.delete(self._store.c.key == key).execute()
|
|
|
|
def __len__(self):
|
|
return self._store.count().execute().fetchone()[0]
|
|
|
|
|
|
__all__ = ['Shove']
|