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Use context manager for locking

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This commit is contained in:
Unrud 2016-05-22 08:47:19 +02:00
parent ff3b31fed6
commit bca6cec6b3
2 changed files with 31 additions and 38 deletions
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60
radicale/__init__.py
View File

@ -282,45 +282,37 @@ class Application:
is_authenticated = self.is_authenticated(user, password)
is_valid_user = is_authenticated or not user
lock = None
try:
if is_valid_user:
if function in (self.do_GET, self.do_HEAD,
self.do_OPTIONS, self.do_PROPFIND,
self.do_REPORT):
lock_mode = "r"
else:
lock_mode = "w"
lock = self.Collection.acquire_lock(lock_mode)
# Get content
content_length = int(environ.get("CONTENT_LENGTH") or 0)
if content_length:
content = self.decode(
environ["wsgi.input"].read(content_length), environ)
self.logger.debug("Request content:\n%s" % content)
else:
content = None
if is_valid_user:
if function in (self.do_GET, self.do_HEAD,
self.do_OPTIONS, self.do_PROPFIND,
self.do_REPORT):
lock_mode = "r"
else:
lock_mode = "w"
with self.Collection.acquire_lock(lock_mode):
items = self.Collection.discover(
path, environ.get("HTTP_DEPTH", "0"))
read_allowed_items, write_allowed_items = (
self.collect_allowed_items(items, user))
else:
read_allowed_items, write_allowed_items = None, None
# Get content
content_length = int(environ.get("CONTENT_LENGTH") or 0)
if content_length:
content = self.decode(
environ["wsgi.input"].read(content_length), environ)
self.logger.debug("Request content:\n%s" % content)
else:
content = None
if is_valid_user and (
(read_allowed_items or write_allowed_items) or
(is_authenticated and function == self.do_PROPFIND) or
function == self.do_OPTIONS):
status, headers, answer = function(
environ, read_allowed_items, write_allowed_items, content,
user)
else:
status, headers, answer = NOT_ALLOWED
finally:
if lock:
lock.release()
if (read_allowed_items or write_allowed_items or
is_authenticated and function == self.do_PROPFIND or
function == self.do_OPTIONS):
status, headers, answer = function(
environ, read_allowed_items, write_allowed_items,
content, user)
else:
status, headers, answer = NOT_ALLOWED
else:
status, headers, answer = NOT_ALLOWED
if (status, headers, answer) == NOT_ALLOWED and not is_authenticated:
# Unknown or unauthorized user

9
radicale/storage.py
View File

@ -277,14 +277,13 @@ class BaseCollection:
raise NotImplementedError
@classmethod
@contextmanager
def acquire_lock(cls, mode):
"""Lock the whole storage.
"""Set a context manager to lock the whole storage.
``mode`` must either be "r" for shared access or "w" for exclusive
access.
Returns an object which has a method ``release``.
"""
raise NotImplementedError
@ -521,6 +520,7 @@ class Collection(BaseCollection):
_lock = threading.Lock()
@classmethod
@contextmanager
def acquire_lock(cls, mode):
class Lock:
def __init__(self, release_method):
@ -574,4 +574,5 @@ class Collection(BaseCollection):
# TODO: use readers–writer lock
cls._lock.acquire()
lock = Lock(cls._lock.release)
return lock
yield
lock.release()