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bbf6d9b026
Bugfix for feeds
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login page is free of non accessible elements
boolean custom column is vivible in UI
books with only with certain languages can be shown
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Anonymous user view is more resticted
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Dependencys in vendor folder are updated to newer versions (licencs files are now present)
Bugfix editing Authors names
Made upload on windows working
389 lines
13 KiB
Python
389 lines
13 KiB
Python
#!/usr/bin/env python
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#
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# Copyright 2010 Facebook
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""`StackContext` allows applications to maintain threadlocal-like state
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that follows execution as it moves to other execution contexts.
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The motivating examples are to eliminate the need for explicit
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``async_callback`` wrappers (as in `tornado.web.RequestHandler`), and to
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allow some additional context to be kept for logging.
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This is slightly magic, but it's an extension of the idea that an
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exception handler is a kind of stack-local state and when that stack
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is suspended and resumed in a new context that state needs to be
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preserved. `StackContext` shifts the burden of restoring that state
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from each call site (e.g. wrapping each `.AsyncHTTPClient` callback
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in ``async_callback``) to the mechanisms that transfer control from
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one context to another (e.g. `.AsyncHTTPClient` itself, `.IOLoop`,
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thread pools, etc).
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Example usage::
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@contextlib.contextmanager
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def die_on_error():
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try:
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yield
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except Exception:
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logging.error("exception in asynchronous operation",exc_info=True)
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sys.exit(1)
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with StackContext(die_on_error):
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# Any exception thrown here *or in callback and its descendants*
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# will cause the process to exit instead of spinning endlessly
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# in the ioloop.
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http_client.fetch(url, callback)
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ioloop.start()
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Most applications shouldn't have to work with `StackContext` directly.
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Here are a few rules of thumb for when it's necessary:
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* If you're writing an asynchronous library that doesn't rely on a
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stack_context-aware library like `tornado.ioloop` or `tornado.iostream`
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(for example, if you're writing a thread pool), use
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`.stack_context.wrap()` before any asynchronous operations to capture the
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stack context from where the operation was started.
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* If you're writing an asynchronous library that has some shared
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resources (such as a connection pool), create those shared resources
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within a ``with stack_context.NullContext():`` block. This will prevent
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``StackContexts`` from leaking from one request to another.
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* If you want to write something like an exception handler that will
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persist across asynchronous calls, create a new `StackContext` (or
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`ExceptionStackContext`), and make your asynchronous calls in a ``with``
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block that references your `StackContext`.
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"""
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from __future__ import absolute_import, division, print_function, with_statement
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import sys
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import threading
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from tornado.util import raise_exc_info
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class StackContextInconsistentError(Exception):
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pass
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class _State(threading.local):
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def __init__(self):
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self.contexts = (tuple(), None)
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_state = _State()
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class StackContext(object):
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"""Establishes the given context as a StackContext that will be transferred.
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Note that the parameter is a callable that returns a context
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manager, not the context itself. That is, where for a
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non-transferable context manager you would say::
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with my_context():
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StackContext takes the function itself rather than its result::
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with StackContext(my_context):
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The result of ``with StackContext() as cb:`` is a deactivation
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callback. Run this callback when the StackContext is no longer
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needed to ensure that it is not propagated any further (note that
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deactivating a context does not affect any instances of that
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context that are currently pending). This is an advanced feature
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and not necessary in most applications.
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"""
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def __init__(self, context_factory):
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self.context_factory = context_factory
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self.contexts = []
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self.active = True
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def _deactivate(self):
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self.active = False
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# StackContext protocol
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def enter(self):
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context = self.context_factory()
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self.contexts.append(context)
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context.__enter__()
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def exit(self, type, value, traceback):
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context = self.contexts.pop()
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context.__exit__(type, value, traceback)
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# Note that some of this code is duplicated in ExceptionStackContext
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# below. ExceptionStackContext is more common and doesn't need
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# the full generality of this class.
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def __enter__(self):
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self.old_contexts = _state.contexts
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self.new_contexts = (self.old_contexts[0] + (self,), self)
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_state.contexts = self.new_contexts
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try:
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self.enter()
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except:
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_state.contexts = self.old_contexts
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raise
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return self._deactivate
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def __exit__(self, type, value, traceback):
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try:
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self.exit(type, value, traceback)
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finally:
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final_contexts = _state.contexts
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_state.contexts = self.old_contexts
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# Generator coroutines and with-statements with non-local
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# effects interact badly. Check here for signs of
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# the stack getting out of sync.
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# Note that this check comes after restoring _state.context
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# so that if it fails things are left in a (relatively)
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# consistent state.
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if final_contexts is not self.new_contexts:
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raise StackContextInconsistentError(
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'stack_context inconsistency (may be caused by yield '
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'within a "with StackContext" block)')
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# Break up a reference to itself to allow for faster GC on CPython.
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self.new_contexts = None
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class ExceptionStackContext(object):
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"""Specialization of StackContext for exception handling.
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The supplied ``exception_handler`` function will be called in the
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event of an uncaught exception in this context. The semantics are
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similar to a try/finally clause, and intended use cases are to log
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an error, close a socket, or similar cleanup actions. The
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``exc_info`` triple ``(type, value, traceback)`` will be passed to the
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exception_handler function.
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If the exception handler returns true, the exception will be
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consumed and will not be propagated to other exception handlers.
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"""
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def __init__(self, exception_handler):
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self.exception_handler = exception_handler
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self.active = True
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def _deactivate(self):
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self.active = False
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def exit(self, type, value, traceback):
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if type is not None:
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return self.exception_handler(type, value, traceback)
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def __enter__(self):
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self.old_contexts = _state.contexts
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self.new_contexts = (self.old_contexts[0], self)
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_state.contexts = self.new_contexts
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return self._deactivate
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def __exit__(self, type, value, traceback):
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try:
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if type is not None:
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return self.exception_handler(type, value, traceback)
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finally:
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final_contexts = _state.contexts
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_state.contexts = self.old_contexts
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if final_contexts is not self.new_contexts:
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raise StackContextInconsistentError(
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'stack_context inconsistency (may be caused by yield '
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'within a "with StackContext" block)')
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# Break up a reference to itself to allow for faster GC on CPython.
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self.new_contexts = None
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class NullContext(object):
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"""Resets the `StackContext`.
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Useful when creating a shared resource on demand (e.g. an
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`.AsyncHTTPClient`) where the stack that caused the creating is
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not relevant to future operations.
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"""
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def __enter__(self):
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self.old_contexts = _state.contexts
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_state.contexts = (tuple(), None)
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def __exit__(self, type, value, traceback):
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_state.contexts = self.old_contexts
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def _remove_deactivated(contexts):
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"""Remove deactivated handlers from the chain"""
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# Clean ctx handlers
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stack_contexts = tuple([h for h in contexts[0] if h.active])
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# Find new head
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head = contexts[1]
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while head is not None and not head.active:
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head = head.old_contexts[1]
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# Process chain
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ctx = head
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while ctx is not None:
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parent = ctx.old_contexts[1]
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while parent is not None:
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if parent.active:
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break
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ctx.old_contexts = parent.old_contexts
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parent = parent.old_contexts[1]
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ctx = parent
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return (stack_contexts, head)
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def wrap(fn):
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"""Returns a callable object that will restore the current `StackContext`
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when executed.
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Use this whenever saving a callback to be executed later in a
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different execution context (either in a different thread or
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asynchronously in the same thread).
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"""
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# Check if function is already wrapped
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if fn is None or hasattr(fn, '_wrapped'):
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return fn
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# Capture current stack head
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# TODO: Any other better way to store contexts and update them in wrapped function?
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cap_contexts = [_state.contexts]
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if not cap_contexts[0][0] and not cap_contexts[0][1]:
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# Fast path when there are no active contexts.
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def null_wrapper(*args, **kwargs):
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try:
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current_state = _state.contexts
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_state.contexts = cap_contexts[0]
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return fn(*args, **kwargs)
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finally:
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_state.contexts = current_state
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null_wrapper._wrapped = True
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return null_wrapper
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def wrapped(*args, **kwargs):
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ret = None
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try:
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# Capture old state
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current_state = _state.contexts
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# Remove deactivated items
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cap_contexts[0] = contexts = _remove_deactivated(cap_contexts[0])
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# Force new state
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_state.contexts = contexts
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# Current exception
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exc = (None, None, None)
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top = None
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# Apply stack contexts
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last_ctx = 0
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stack = contexts[0]
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# Apply state
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for n in stack:
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try:
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n.enter()
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last_ctx += 1
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except:
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# Exception happened. Record exception info and store top-most handler
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exc = sys.exc_info()
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top = n.old_contexts[1]
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# Execute callback if no exception happened while restoring state
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if top is None:
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try:
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ret = fn(*args, **kwargs)
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except:
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exc = sys.exc_info()
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top = contexts[1]
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# If there was exception, try to handle it by going through the exception chain
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if top is not None:
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exc = _handle_exception(top, exc)
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else:
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# Otherwise take shorter path and run stack contexts in reverse order
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while last_ctx > 0:
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last_ctx -= 1
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c = stack[last_ctx]
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try:
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c.exit(*exc)
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except:
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exc = sys.exc_info()
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top = c.old_contexts[1]
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break
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else:
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top = None
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# If if exception happened while unrolling, take longer exception handler path
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if top is not None:
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exc = _handle_exception(top, exc)
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# If exception was not handled, raise it
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if exc != (None, None, None):
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raise_exc_info(exc)
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finally:
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_state.contexts = current_state
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return ret
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wrapped._wrapped = True
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return wrapped
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def _handle_exception(tail, exc):
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while tail is not None:
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try:
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if tail.exit(*exc):
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exc = (None, None, None)
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except:
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exc = sys.exc_info()
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tail = tail.old_contexts[1]
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return exc
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def run_with_stack_context(context, func):
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"""Run a coroutine ``func`` in the given `StackContext`.
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It is not safe to have a ``yield`` statement within a ``with StackContext``
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block, so it is difficult to use stack context with `.gen.coroutine`.
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This helper function runs the function in the correct context while
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keeping the ``yield`` and ``with`` statements syntactically separate.
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Example::
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@gen.coroutine
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def incorrect():
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with StackContext(ctx):
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# ERROR: this will raise StackContextInconsistentError
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yield other_coroutine()
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@gen.coroutine
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def correct():
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yield run_with_stack_context(StackContext(ctx), other_coroutine)
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.. versionadded:: 3.1
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"""
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with context:
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return func()
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