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"""Beaker utilities"""
try:
import thread as _thread
import threading as _threading
except ImportError:
import dummy_thread as _thread
import dummy_threading as _threading
from datetime import datetime, timedelta
import os
import string
import types
import weakref
import warnings
import sys
py3k = getattr(sys, 'py3kwarning', False) or sys.version_info >= (3, 0)
py24 = sys.version_info < (2,5)
jython = sys.platform.startswith('java')
if py3k or jython:
import pickle
else:
import cPickle as pickle
from beaker.converters import asbool
from threading import local as _tlocal
__all__ = ["ThreadLocal", "Registry", "WeakValuedRegistry", "SyncDict",
"encoded_path", "verify_directory"]
def verify_directory(dir):
"""verifies and creates a directory. tries to
ignore collisions with other threads and processes."""
tries = 0
while not os.access(dir, os.F_OK):
try:
tries += 1
os.makedirs(dir)
except:
if tries > 5:
raise
def deprecated(message):
def wrapper(fn):
def deprecated_method(*args, **kargs):
warnings.warn(message, DeprecationWarning, 2)
return fn(*args, **kargs)
# TODO: use decorator ? functools.wrapper ?
deprecated_method.__name__ = fn.__name__
deprecated_method.__doc__ = "%s\n\n%s" % (message, fn.__doc__)
return deprecated_method
return wrapper
class ThreadLocal(object):
"""stores a value on a per-thread basis"""
__slots__ = '_tlocal'
def __init__(self):
self._tlocal = _tlocal()
def put(self, value):
self._tlocal.value = value
def has(self):
return hasattr(self._tlocal, 'value')
def get(self, default=None):
return getattr(self._tlocal, 'value', default)
def remove(self):
del self._tlocal.value
class SyncDict(object):
"""
An efficient/threadsafe singleton map algorithm, a.k.a.
"get a value based on this key, and create if not found or not
valid" paradigm:
exists && isvalid ? get : create
Designed to work with weakref dictionaries to expect items
to asynchronously disappear from the dictionary.
Use python 2.3.3 or greater ! a major bug was just fixed in Nov.
2003 that was driving me nuts with garbage collection/weakrefs in
this section.
"""
def __init__(self):
self.mutex = _thread.allocate_lock()
self.dict = {}
def get(self, key, createfunc, *args, **kwargs):
try:
if self.has_key(key):
return self.dict[key]
else:
return self.sync_get(key, createfunc, *args, **kwargs)
except KeyError:
return self.sync_get(key, createfunc, *args, **kwargs)
def sync_get(self, key, createfunc, *args, **kwargs):
self.mutex.acquire()
try:
try:
if self.has_key(key):
return self.dict[key]
else:
return self._create(key, createfunc, *args, **kwargs)
except KeyError:
return self._create(key, createfunc, *args, **kwargs)
finally:
self.mutex.release()
def _create(self, key, createfunc, *args, **kwargs):
self[key] = obj = createfunc(*args, **kwargs)
return obj
def has_key(self, key):
return self.dict.has_key(key)
def __contains__(self, key):
return self.dict.__contains__(key)
def __getitem__(self, key):
return self.dict.__getitem__(key)
def __setitem__(self, key, value):
self.dict.__setitem__(key, value)
def __delitem__(self, key):
return self.dict.__delitem__(key)
def clear(self):
self.dict.clear()
class WeakValuedRegistry(SyncDict):
def __init__(self):
self.mutex = _threading.RLock()
self.dict = weakref.WeakValueDictionary()
sha1 = None
def encoded_path(root, identifiers, extension = ".enc", depth = 3,
digest_filenames=True):
"""Generate a unique file-accessible path from the given list of
identifiers starting at the given root directory."""
ident = "_".join(identifiers)
global sha1
if sha1 is None:
from beaker.crypto import sha1
if digest_filenames:
if py3k:
ident = sha1(ident.encode('utf-8')).hexdigest()
else:
ident = sha1(ident).hexdigest()
ident = os.path.basename(ident)
tokens = []
for d in range(1, depth):
tokens.append(ident[0:d])
dir = os.path.join(root, *tokens)
verify_directory(dir)
return os.path.join(dir, ident + extension)
def verify_options(opt, types, error):
if not isinstance(opt, types):
if not isinstance(types, tuple):
types = (types,)
coerced = False
for typ in types:
try:
if typ in (list, tuple):
opt = [x.strip() for x in opt.split(',')]
else:
if typ == bool:
typ = asbool
opt = typ(opt)
coerced = True
except:
pass
if coerced:
break
if not coerced:
raise Exception(error)
elif isinstance(opt, str) and not opt.strip():
raise Exception("Empty strings are invalid for: %s" % error)
return opt
def verify_rules(params, ruleset):
for key, types, message in ruleset:
if key in params:
params[key] = verify_options(params[key], types, message)
return params
def coerce_session_params(params):
rules = [
('data_dir', (str, types.NoneType), "data_dir must be a string "
"referring to a directory."),
('lock_dir', (str, types.NoneType), "lock_dir must be a string referring to a "
"directory."),
('type', (str, types.NoneType), "Session type must be a string."),
('cookie_expires', (bool, datetime, timedelta), "Cookie expires was "
"not a boolean, datetime, or timedelta instance."),
('cookie_domain', (str, types.NoneType), "Cookie domain must be a "
"string."),
('id', (str,), "Session id must be a string."),
('key', (str,), "Session key must be a string."),
('secret', (str, types.NoneType), "Session secret must be a string."),
('validate_key', (str, types.NoneType), "Session encrypt_key must be "
"a string."),
('encrypt_key', (str, types.NoneType), "Session validate_key must be "
"a string."),
('secure', (bool, types.NoneType), "Session secure must be a boolean."),
('timeout', (int, types.NoneType), "Session timeout must be an "
"integer."),
('auto', (bool, types.NoneType), "Session is created if accessed."),
]
return verify_rules(params, rules)
def coerce_cache_params(params):
rules = [
('data_dir', (str, types.NoneType), "data_dir must be a string "
"referring to a directory."),
('lock_dir', (str, types.NoneType), "lock_dir must be a string referring to a "
"directory."),
('type', (str,), "Cache type must be a string."),
('enabled', (bool, types.NoneType), "enabled must be true/false "
"if present."),
('expire', (int, types.NoneType), "expire must be an integer representing "
"how many seconds the cache is valid for"),
('regions', (list, tuple, types.NoneType), "Regions must be a "
"comma seperated list of valid regions")
]
return verify_rules(params, rules)
def parse_cache_config_options(config, include_defaults=True):
"""Parse configuration options and validate for use with the
CacheManager"""
# Load default cache options
if include_defaults:
options= dict(type='memory', data_dir=None, expire=None,
log_file=None)
else:
options = {}
for key, val in config.iteritems():
if key.startswith('beaker.cache.'):
options[key[13:]] = val
if key.startswith('cache.'):
options[key[6:]] = val
coerce_cache_params(options)
# Set cache to enabled if not turned off
if 'enabled' not in options:
options['enabled'] = True
# Configure region dict if regions are available
regions = options.pop('regions', None)
if regions:
region_configs = {}
for region in regions:
# Setup the default cache options
region_options = dict(data_dir=options.get('data_dir'),
lock_dir=options.get('lock_dir'),
type=options.get('type'),
enabled=options['enabled'],
expire=options.get('expire'))
region_len = len(region) + 1
for key in options.keys():
if key.startswith('%s.' % region):
region_options[key[region_len:]] = options.pop(key)
coerce_cache_params(region_options)
region_configs[region] = region_options
options['cache_regions'] = region_configs
return options
def func_namespace(func):
"""Generates a unique namespace for a function"""
kls = None
if hasattr(func, 'im_func'):
kls = func.im_class
func = func.im_func
if kls:
return '%s.%s' % (kls.__module__, kls.__name__)
else:
return '%s.%s' % (func.__module__, func.__name__)