bbf6d9b026
Bugfix for feeds
- removed categories related and up
- load new books now working
- category random now working
login page is free of non accessible elements
boolean custom column is vivible in UI
books with only with certain languages can be shown
book shelfs can be deleted from UI
Anonymous user view is more resticted
Added browse of series in sidebar
Dependencys in vendor folder are updated to newer versions (licencs files are now present)
Bugfix editing Authors names
Made upload on windows working
2007 lines
81 KiB
Python
2007 lines
81 KiB
Python
# -*- coding: utf-8 -*-
|
||
"""
|
||
flask.app
|
||
~~~~~~~~~
|
||
|
||
This module implements the central WSGI application object.
|
||
|
||
:copyright: (c) 2015 by Armin Ronacher.
|
||
:license: BSD, see LICENSE for more details.
|
||
"""
|
||
import os
|
||
import sys
|
||
from threading import Lock
|
||
from datetime import timedelta
|
||
from itertools import chain
|
||
from functools import update_wrapper
|
||
from collections import deque
|
||
|
||
from werkzeug.datastructures import ImmutableDict
|
||
from werkzeug.routing import Map, Rule, RequestRedirect, BuildError
|
||
from werkzeug.exceptions import HTTPException, InternalServerError, \
|
||
MethodNotAllowed, BadRequest, default_exceptions
|
||
|
||
from .helpers import _PackageBoundObject, url_for, get_flashed_messages, \
|
||
locked_cached_property, _endpoint_from_view_func, find_package, \
|
||
get_debug_flag
|
||
from . import json, cli
|
||
from .wrappers import Request, Response
|
||
from .config import ConfigAttribute, Config
|
||
from .ctx import RequestContext, AppContext, _AppCtxGlobals
|
||
from .globals import _request_ctx_stack, request, session, g
|
||
from .sessions import SecureCookieSessionInterface
|
||
from .templating import DispatchingJinjaLoader, Environment, \
|
||
_default_template_ctx_processor
|
||
from .signals import request_started, request_finished, got_request_exception, \
|
||
request_tearing_down, appcontext_tearing_down
|
||
from ._compat import reraise, string_types, text_type, integer_types
|
||
|
||
# a lock used for logger initialization
|
||
_logger_lock = Lock()
|
||
|
||
# a singleton sentinel value for parameter defaults
|
||
_sentinel = object()
|
||
|
||
|
||
def _make_timedelta(value):
|
||
if not isinstance(value, timedelta):
|
||
return timedelta(seconds=value)
|
||
return value
|
||
|
||
|
||
def setupmethod(f):
|
||
"""Wraps a method so that it performs a check in debug mode if the
|
||
first request was already handled.
|
||
"""
|
||
def wrapper_func(self, *args, **kwargs):
|
||
if self.debug and self._got_first_request:
|
||
raise AssertionError('A setup function was called after the '
|
||
'first request was handled. This usually indicates a bug '
|
||
'in the application where a module was not imported '
|
||
'and decorators or other functionality was called too late.\n'
|
||
'To fix this make sure to import all your view modules, '
|
||
'database models and everything related at a central place '
|
||
'before the application starts serving requests.')
|
||
return f(self, *args, **kwargs)
|
||
return update_wrapper(wrapper_func, f)
|
||
|
||
|
||
class Flask(_PackageBoundObject):
|
||
"""The flask object implements a WSGI application and acts as the central
|
||
object. It is passed the name of the module or package of the
|
||
application. Once it is created it will act as a central registry for
|
||
the view functions, the URL rules, template configuration and much more.
|
||
|
||
The name of the package is used to resolve resources from inside the
|
||
package or the folder the module is contained in depending on if the
|
||
package parameter resolves to an actual python package (a folder with
|
||
an :file:`__init__.py` file inside) or a standard module (just a ``.py`` file).
|
||
|
||
For more information about resource loading, see :func:`open_resource`.
|
||
|
||
Usually you create a :class:`Flask` instance in your main module or
|
||
in the :file:`__init__.py` file of your package like this::
|
||
|
||
from flask import Flask
|
||
app = Flask(__name__)
|
||
|
||
.. admonition:: About the First Parameter
|
||
|
||
The idea of the first parameter is to give Flask an idea of what
|
||
belongs to your application. This name is used to find resources
|
||
on the filesystem, can be used by extensions to improve debugging
|
||
information and a lot more.
|
||
|
||
So it's important what you provide there. If you are using a single
|
||
module, `__name__` is always the correct value. If you however are
|
||
using a package, it's usually recommended to hardcode the name of
|
||
your package there.
|
||
|
||
For example if your application is defined in :file:`yourapplication/app.py`
|
||
you should create it with one of the two versions below::
|
||
|
||
app = Flask('yourapplication')
|
||
app = Flask(__name__.split('.')[0])
|
||
|
||
Why is that? The application will work even with `__name__`, thanks
|
||
to how resources are looked up. However it will make debugging more
|
||
painful. Certain extensions can make assumptions based on the
|
||
import name of your application. For example the Flask-SQLAlchemy
|
||
extension will look for the code in your application that triggered
|
||
an SQL query in debug mode. If the import name is not properly set
|
||
up, that debugging information is lost. (For example it would only
|
||
pick up SQL queries in `yourapplication.app` and not
|
||
`yourapplication.views.frontend`)
|
||
|
||
.. versionadded:: 0.7
|
||
The `static_url_path`, `static_folder`, and `template_folder`
|
||
parameters were added.
|
||
|
||
.. versionadded:: 0.8
|
||
The `instance_path` and `instance_relative_config` parameters were
|
||
added.
|
||
|
||
.. versionadded:: 0.11
|
||
The `root_path` parameter was added.
|
||
|
||
:param import_name: the name of the application package
|
||
:param static_url_path: can be used to specify a different path for the
|
||
static files on the web. Defaults to the name
|
||
of the `static_folder` folder.
|
||
:param static_folder: the folder with static files that should be served
|
||
at `static_url_path`. Defaults to the ``'static'``
|
||
folder in the root path of the application.
|
||
:param template_folder: the folder that contains the templates that should
|
||
be used by the application. Defaults to
|
||
``'templates'`` folder in the root path of the
|
||
application.
|
||
:param instance_path: An alternative instance path for the application.
|
||
By default the folder ``'instance'`` next to the
|
||
package or module is assumed to be the instance
|
||
path.
|
||
:param instance_relative_config: if set to ``True`` relative filenames
|
||
for loading the config are assumed to
|
||
be relative to the instance path instead
|
||
of the application root.
|
||
:param root_path: Flask by default will automatically calculate the path
|
||
to the root of the application. In certain situations
|
||
this cannot be achieved (for instance if the package
|
||
is a Python 3 namespace package) and needs to be
|
||
manually defined.
|
||
"""
|
||
|
||
#: The class that is used for request objects. See :class:`~flask.Request`
|
||
#: for more information.
|
||
request_class = Request
|
||
|
||
#: The class that is used for response objects. See
|
||
#: :class:`~flask.Response` for more information.
|
||
response_class = Response
|
||
|
||
#: The class that is used for the Jinja environment.
|
||
#:
|
||
#: .. versionadded:: 0.11
|
||
jinja_environment = Environment
|
||
|
||
#: The class that is used for the :data:`~flask.g` instance.
|
||
#:
|
||
#: Example use cases for a custom class:
|
||
#:
|
||
#: 1. Store arbitrary attributes on flask.g.
|
||
#: 2. Add a property for lazy per-request database connectors.
|
||
#: 3. Return None instead of AttributeError on unexpected attributes.
|
||
#: 4. Raise exception if an unexpected attr is set, a "controlled" flask.g.
|
||
#:
|
||
#: In Flask 0.9 this property was called `request_globals_class` but it
|
||
#: was changed in 0.10 to :attr:`app_ctx_globals_class` because the
|
||
#: flask.g object is now application context scoped.
|
||
#:
|
||
#: .. versionadded:: 0.10
|
||
app_ctx_globals_class = _AppCtxGlobals
|
||
|
||
# Backwards compatibility support
|
||
def _get_request_globals_class(self):
|
||
return self.app_ctx_globals_class
|
||
def _set_request_globals_class(self, value):
|
||
from warnings import warn
|
||
warn(DeprecationWarning('request_globals_class attribute is now '
|
||
'called app_ctx_globals_class'))
|
||
self.app_ctx_globals_class = value
|
||
request_globals_class = property(_get_request_globals_class,
|
||
_set_request_globals_class)
|
||
del _get_request_globals_class, _set_request_globals_class
|
||
|
||
#: The class that is used for the ``config`` attribute of this app.
|
||
#: Defaults to :class:`~flask.Config`.
|
||
#:
|
||
#: Example use cases for a custom class:
|
||
#:
|
||
#: 1. Default values for certain config options.
|
||
#: 2. Access to config values through attributes in addition to keys.
|
||
#:
|
||
#: .. versionadded:: 0.11
|
||
config_class = Config
|
||
|
||
#: The debug flag. Set this to ``True`` to enable debugging of the
|
||
#: application. In debug mode the debugger will kick in when an unhandled
|
||
#: exception occurs and the integrated server will automatically reload
|
||
#: the application if changes in the code are detected.
|
||
#:
|
||
#: This attribute can also be configured from the config with the ``DEBUG``
|
||
#: configuration key. Defaults to ``False``.
|
||
debug = ConfigAttribute('DEBUG')
|
||
|
||
#: The testing flag. Set this to ``True`` to enable the test mode of
|
||
#: Flask extensions (and in the future probably also Flask itself).
|
||
#: For example this might activate unittest helpers that have an
|
||
#: additional runtime cost which should not be enabled by default.
|
||
#:
|
||
#: If this is enabled and PROPAGATE_EXCEPTIONS is not changed from the
|
||
#: default it's implicitly enabled.
|
||
#:
|
||
#: This attribute can also be configured from the config with the
|
||
#: ``TESTING`` configuration key. Defaults to ``False``.
|
||
testing = ConfigAttribute('TESTING')
|
||
|
||
#: If a secret key is set, cryptographic components can use this to
|
||
#: sign cookies and other things. Set this to a complex random value
|
||
#: when you want to use the secure cookie for instance.
|
||
#:
|
||
#: This attribute can also be configured from the config with the
|
||
#: ``SECRET_KEY`` configuration key. Defaults to ``None``.
|
||
secret_key = ConfigAttribute('SECRET_KEY')
|
||
|
||
#: The secure cookie uses this for the name of the session cookie.
|
||
#:
|
||
#: This attribute can also be configured from the config with the
|
||
#: ``SESSION_COOKIE_NAME`` configuration key. Defaults to ``'session'``
|
||
session_cookie_name = ConfigAttribute('SESSION_COOKIE_NAME')
|
||
|
||
#: A :class:`~datetime.timedelta` which is used to set the expiration
|
||
#: date of a permanent session. The default is 31 days which makes a
|
||
#: permanent session survive for roughly one month.
|
||
#:
|
||
#: This attribute can also be configured from the config with the
|
||
#: ``PERMANENT_SESSION_LIFETIME`` configuration key. Defaults to
|
||
#: ``timedelta(days=31)``
|
||
permanent_session_lifetime = ConfigAttribute('PERMANENT_SESSION_LIFETIME',
|
||
get_converter=_make_timedelta)
|
||
|
||
#: A :class:`~datetime.timedelta` which is used as default cache_timeout
|
||
#: for the :func:`send_file` functions. The default is 12 hours.
|
||
#:
|
||
#: This attribute can also be configured from the config with the
|
||
#: ``SEND_FILE_MAX_AGE_DEFAULT`` configuration key. This configuration
|
||
#: variable can also be set with an integer value used as seconds.
|
||
#: Defaults to ``timedelta(hours=12)``
|
||
send_file_max_age_default = ConfigAttribute('SEND_FILE_MAX_AGE_DEFAULT',
|
||
get_converter=_make_timedelta)
|
||
|
||
#: Enable this if you want to use the X-Sendfile feature. Keep in
|
||
#: mind that the server has to support this. This only affects files
|
||
#: sent with the :func:`send_file` method.
|
||
#:
|
||
#: .. versionadded:: 0.2
|
||
#:
|
||
#: This attribute can also be configured from the config with the
|
||
#: ``USE_X_SENDFILE`` configuration key. Defaults to ``False``.
|
||
use_x_sendfile = ConfigAttribute('USE_X_SENDFILE')
|
||
|
||
#: The name of the logger to use. By default the logger name is the
|
||
#: package name passed to the constructor.
|
||
#:
|
||
#: .. versionadded:: 0.4
|
||
logger_name = ConfigAttribute('LOGGER_NAME')
|
||
|
||
#: The JSON encoder class to use. Defaults to :class:`~flask.json.JSONEncoder`.
|
||
#:
|
||
#: .. versionadded:: 0.10
|
||
json_encoder = json.JSONEncoder
|
||
|
||
#: The JSON decoder class to use. Defaults to :class:`~flask.json.JSONDecoder`.
|
||
#:
|
||
#: .. versionadded:: 0.10
|
||
json_decoder = json.JSONDecoder
|
||
|
||
#: Options that are passed directly to the Jinja2 environment.
|
||
jinja_options = ImmutableDict(
|
||
extensions=['jinja2.ext.autoescape', 'jinja2.ext.with_']
|
||
)
|
||
|
||
#: Default configuration parameters.
|
||
default_config = ImmutableDict({
|
||
'DEBUG': get_debug_flag(default=False),
|
||
'TESTING': False,
|
||
'PROPAGATE_EXCEPTIONS': None,
|
||
'PRESERVE_CONTEXT_ON_EXCEPTION': None,
|
||
'SECRET_KEY': None,
|
||
'PERMANENT_SESSION_LIFETIME': timedelta(days=31),
|
||
'USE_X_SENDFILE': False,
|
||
'LOGGER_NAME': None,
|
||
'LOGGER_HANDLER_POLICY': 'always',
|
||
'SERVER_NAME': None,
|
||
'APPLICATION_ROOT': None,
|
||
'SESSION_COOKIE_NAME': 'session',
|
||
'SESSION_COOKIE_DOMAIN': None,
|
||
'SESSION_COOKIE_PATH': None,
|
||
'SESSION_COOKIE_HTTPONLY': True,
|
||
'SESSION_COOKIE_SECURE': False,
|
||
'SESSION_REFRESH_EACH_REQUEST': True,
|
||
'MAX_CONTENT_LENGTH': None,
|
||
'SEND_FILE_MAX_AGE_DEFAULT': timedelta(hours=12),
|
||
'TRAP_BAD_REQUEST_ERRORS': False,
|
||
'TRAP_HTTP_EXCEPTIONS': False,
|
||
'EXPLAIN_TEMPLATE_LOADING': False,
|
||
'PREFERRED_URL_SCHEME': 'http',
|
||
'JSON_AS_ASCII': True,
|
||
'JSON_SORT_KEYS': True,
|
||
'JSONIFY_PRETTYPRINT_REGULAR': True,
|
||
'JSONIFY_MIMETYPE': 'application/json',
|
||
'TEMPLATES_AUTO_RELOAD': None,
|
||
})
|
||
|
||
#: The rule object to use for URL rules created. This is used by
|
||
#: :meth:`add_url_rule`. Defaults to :class:`werkzeug.routing.Rule`.
|
||
#:
|
||
#: .. versionadded:: 0.7
|
||
url_rule_class = Rule
|
||
|
||
#: the test client that is used with when `test_client` is used.
|
||
#:
|
||
#: .. versionadded:: 0.7
|
||
test_client_class = None
|
||
|
||
#: the session interface to use. By default an instance of
|
||
#: :class:`~flask.sessions.SecureCookieSessionInterface` is used here.
|
||
#:
|
||
#: .. versionadded:: 0.8
|
||
session_interface = SecureCookieSessionInterface()
|
||
|
||
def __init__(self, import_name, static_path=None, static_url_path=None,
|
||
static_folder='static', template_folder='templates',
|
||
instance_path=None, instance_relative_config=False,
|
||
root_path=None):
|
||
_PackageBoundObject.__init__(self, import_name,
|
||
template_folder=template_folder,
|
||
root_path=root_path)
|
||
if static_path is not None:
|
||
from warnings import warn
|
||
warn(DeprecationWarning('static_path is now called '
|
||
'static_url_path'), stacklevel=2)
|
||
static_url_path = static_path
|
||
|
||
if static_url_path is not None:
|
||
self.static_url_path = static_url_path
|
||
if static_folder is not None:
|
||
self.static_folder = static_folder
|
||
if instance_path is None:
|
||
instance_path = self.auto_find_instance_path()
|
||
elif not os.path.isabs(instance_path):
|
||
raise ValueError('If an instance path is provided it must be '
|
||
'absolute. A relative path was given instead.')
|
||
|
||
#: Holds the path to the instance folder.
|
||
#:
|
||
#: .. versionadded:: 0.8
|
||
self.instance_path = instance_path
|
||
|
||
#: The configuration dictionary as :class:`Config`. This behaves
|
||
#: exactly like a regular dictionary but supports additional methods
|
||
#: to load a config from files.
|
||
self.config = self.make_config(instance_relative_config)
|
||
|
||
# Prepare the deferred setup of the logger.
|
||
self._logger = None
|
||
self.logger_name = self.import_name
|
||
|
||
#: A dictionary of all view functions registered. The keys will
|
||
#: be function names which are also used to generate URLs and
|
||
#: the values are the function objects themselves.
|
||
#: To register a view function, use the :meth:`route` decorator.
|
||
self.view_functions = {}
|
||
|
||
# support for the now deprecated `error_handlers` attribute. The
|
||
# :attr:`error_handler_spec` shall be used now.
|
||
self._error_handlers = {}
|
||
|
||
#: A dictionary of all registered error handlers. The key is ``None``
|
||
#: for error handlers active on the application, otherwise the key is
|
||
#: the name of the blueprint. Each key points to another dictionary
|
||
#: where the key is the status code of the http exception. The
|
||
#: special key ``None`` points to a list of tuples where the first item
|
||
#: is the class for the instance check and the second the error handler
|
||
#: function.
|
||
#:
|
||
#: To register a error handler, use the :meth:`errorhandler`
|
||
#: decorator.
|
||
self.error_handler_spec = {None: self._error_handlers}
|
||
|
||
#: A list of functions that are called when :meth:`url_for` raises a
|
||
#: :exc:`~werkzeug.routing.BuildError`. Each function registered here
|
||
#: is called with `error`, `endpoint` and `values`. If a function
|
||
#: returns ``None`` or raises a :exc:`BuildError` the next function is
|
||
#: tried.
|
||
#:
|
||
#: .. versionadded:: 0.9
|
||
self.url_build_error_handlers = []
|
||
|
||
#: A dictionary with lists of functions that should be called at the
|
||
#: beginning of the request. The key of the dictionary is the name of
|
||
#: the blueprint this function is active for, ``None`` for all requests.
|
||
#: This can for example be used to open database connections or
|
||
#: getting hold of the currently logged in user. To register a
|
||
#: function here, use the :meth:`before_request` decorator.
|
||
self.before_request_funcs = {}
|
||
|
||
#: A lists of functions that should be called at the beginning of the
|
||
#: first request to this instance. To register a function here, use
|
||
#: the :meth:`before_first_request` decorator.
|
||
#:
|
||
#: .. versionadded:: 0.8
|
||
self.before_first_request_funcs = []
|
||
|
||
#: A dictionary with lists of functions that should be called after
|
||
#: each request. The key of the dictionary is the name of the blueprint
|
||
#: this function is active for, ``None`` for all requests. This can for
|
||
#: example be used to close database connections. To register a function
|
||
#: here, use the :meth:`after_request` decorator.
|
||
self.after_request_funcs = {}
|
||
|
||
#: A dictionary with lists of functions that are called after
|
||
#: each request, even if an exception has occurred. The key of the
|
||
#: dictionary is the name of the blueprint this function is active for,
|
||
#: ``None`` for all requests. These functions are not allowed to modify
|
||
#: the request, and their return values are ignored. If an exception
|
||
#: occurred while processing the request, it gets passed to each
|
||
#: teardown_request function. To register a function here, use the
|
||
#: :meth:`teardown_request` decorator.
|
||
#:
|
||
#: .. versionadded:: 0.7
|
||
self.teardown_request_funcs = {}
|
||
|
||
#: A list of functions that are called when the application context
|
||
#: is destroyed. Since the application context is also torn down
|
||
#: if the request ends this is the place to store code that disconnects
|
||
#: from databases.
|
||
#:
|
||
#: .. versionadded:: 0.9
|
||
self.teardown_appcontext_funcs = []
|
||
|
||
#: A dictionary with lists of functions that can be used as URL
|
||
#: value processor functions. Whenever a URL is built these functions
|
||
#: are called to modify the dictionary of values in place. The key
|
||
#: ``None`` here is used for application wide
|
||
#: callbacks, otherwise the key is the name of the blueprint.
|
||
#: Each of these functions has the chance to modify the dictionary
|
||
#:
|
||
#: .. versionadded:: 0.7
|
||
self.url_value_preprocessors = {}
|
||
|
||
#: A dictionary with lists of functions that can be used as URL value
|
||
#: preprocessors. The key ``None`` here is used for application wide
|
||
#: callbacks, otherwise the key is the name of the blueprint.
|
||
#: Each of these functions has the chance to modify the dictionary
|
||
#: of URL values before they are used as the keyword arguments of the
|
||
#: view function. For each function registered this one should also
|
||
#: provide a :meth:`url_defaults` function that adds the parameters
|
||
#: automatically again that were removed that way.
|
||
#:
|
||
#: .. versionadded:: 0.7
|
||
self.url_default_functions = {}
|
||
|
||
#: A dictionary with list of functions that are called without argument
|
||
#: to populate the template context. The key of the dictionary is the
|
||
#: name of the blueprint this function is active for, ``None`` for all
|
||
#: requests. Each returns a dictionary that the template context is
|
||
#: updated with. To register a function here, use the
|
||
#: :meth:`context_processor` decorator.
|
||
self.template_context_processors = {
|
||
None: [_default_template_ctx_processor]
|
||
}
|
||
|
||
#: A list of shell context processor functions that should be run
|
||
#: when a shell context is created.
|
||
#:
|
||
#: .. versionadded:: 0.11
|
||
self.shell_context_processors = []
|
||
|
||
#: all the attached blueprints in a dictionary by name. Blueprints
|
||
#: can be attached multiple times so this dictionary does not tell
|
||
#: you how often they got attached.
|
||
#:
|
||
#: .. versionadded:: 0.7
|
||
self.blueprints = {}
|
||
self._blueprint_order = []
|
||
|
||
#: a place where extensions can store application specific state. For
|
||
#: example this is where an extension could store database engines and
|
||
#: similar things. For backwards compatibility extensions should register
|
||
#: themselves like this::
|
||
#:
|
||
#: if not hasattr(app, 'extensions'):
|
||
#: app.extensions = {}
|
||
#: app.extensions['extensionname'] = SomeObject()
|
||
#:
|
||
#: The key must match the name of the extension module. For example in
|
||
#: case of a "Flask-Foo" extension in `flask_foo`, the key would be
|
||
#: ``'foo'``.
|
||
#:
|
||
#: .. versionadded:: 0.7
|
||
self.extensions = {}
|
||
|
||
#: The :class:`~werkzeug.routing.Map` for this instance. You can use
|
||
#: this to change the routing converters after the class was created
|
||
#: but before any routes are connected. Example::
|
||
#:
|
||
#: from werkzeug.routing import BaseConverter
|
||
#:
|
||
#: class ListConverter(BaseConverter):
|
||
#: def to_python(self, value):
|
||
#: return value.split(',')
|
||
#: def to_url(self, values):
|
||
#: return ','.join(BaseConverter.to_url(value)
|
||
#: for value in values)
|
||
#:
|
||
#: app = Flask(__name__)
|
||
#: app.url_map.converters['list'] = ListConverter
|
||
self.url_map = Map()
|
||
|
||
# tracks internally if the application already handled at least one
|
||
# request.
|
||
self._got_first_request = False
|
||
self._before_request_lock = Lock()
|
||
|
||
# register the static folder for the application. Do that even
|
||
# if the folder does not exist. First of all it might be created
|
||
# while the server is running (usually happens during development)
|
||
# but also because google appengine stores static files somewhere
|
||
# else when mapped with the .yml file.
|
||
if self.has_static_folder:
|
||
self.add_url_rule(self.static_url_path + '/<path:filename>',
|
||
endpoint='static',
|
||
view_func=self.send_static_file)
|
||
|
||
#: The click command line context for this application. Commands
|
||
#: registered here show up in the :command:`flask` command once the
|
||
#: application has been discovered. The default commands are
|
||
#: provided by Flask itself and can be overridden.
|
||
#:
|
||
#: This is an instance of a :class:`click.Group` object.
|
||
self.cli = cli.AppGroup(self.name)
|
||
|
||
def _get_error_handlers(self):
|
||
from warnings import warn
|
||
warn(DeprecationWarning('error_handlers is deprecated, use the '
|
||
'new error_handler_spec attribute instead.'), stacklevel=1)
|
||
return self._error_handlers
|
||
def _set_error_handlers(self, value):
|
||
self._error_handlers = value
|
||
self.error_handler_spec[None] = value
|
||
error_handlers = property(_get_error_handlers, _set_error_handlers)
|
||
del _get_error_handlers, _set_error_handlers
|
||
|
||
@locked_cached_property
|
||
def name(self):
|
||
"""The name of the application. This is usually the import name
|
||
with the difference that it's guessed from the run file if the
|
||
import name is main. This name is used as a display name when
|
||
Flask needs the name of the application. It can be set and overridden
|
||
to change the value.
|
||
|
||
.. versionadded:: 0.8
|
||
"""
|
||
if self.import_name == '__main__':
|
||
fn = getattr(sys.modules['__main__'], '__file__', None)
|
||
if fn is None:
|
||
return '__main__'
|
||
return os.path.splitext(os.path.basename(fn))[0]
|
||
return self.import_name
|
||
|
||
@property
|
||
def propagate_exceptions(self):
|
||
"""Returns the value of the ``PROPAGATE_EXCEPTIONS`` configuration
|
||
value in case it's set, otherwise a sensible default is returned.
|
||
|
||
.. versionadded:: 0.7
|
||
"""
|
||
rv = self.config['PROPAGATE_EXCEPTIONS']
|
||
if rv is not None:
|
||
return rv
|
||
return self.testing or self.debug
|
||
|
||
@property
|
||
def preserve_context_on_exception(self):
|
||
"""Returns the value of the ``PRESERVE_CONTEXT_ON_EXCEPTION``
|
||
configuration value in case it's set, otherwise a sensible default
|
||
is returned.
|
||
|
||
.. versionadded:: 0.7
|
||
"""
|
||
rv = self.config['PRESERVE_CONTEXT_ON_EXCEPTION']
|
||
if rv is not None:
|
||
return rv
|
||
return self.debug
|
||
|
||
@property
|
||
def logger(self):
|
||
"""A :class:`logging.Logger` object for this application. The
|
||
default configuration is to log to stderr if the application is
|
||
in debug mode. This logger can be used to (surprise) log messages.
|
||
Here some examples::
|
||
|
||
app.logger.debug('A value for debugging')
|
||
app.logger.warning('A warning occurred (%d apples)', 42)
|
||
app.logger.error('An error occurred')
|
||
|
||
.. versionadded:: 0.3
|
||
"""
|
||
if self._logger and self._logger.name == self.logger_name:
|
||
return self._logger
|
||
with _logger_lock:
|
||
if self._logger and self._logger.name == self.logger_name:
|
||
return self._logger
|
||
from flask.logging import create_logger
|
||
self._logger = rv = create_logger(self)
|
||
return rv
|
||
|
||
@locked_cached_property
|
||
def jinja_env(self):
|
||
"""The Jinja2 environment used to load templates."""
|
||
return self.create_jinja_environment()
|
||
|
||
@property
|
||
def got_first_request(self):
|
||
"""This attribute is set to ``True`` if the application started
|
||
handling the first request.
|
||
|
||
.. versionadded:: 0.8
|
||
"""
|
||
return self._got_first_request
|
||
|
||
def make_config(self, instance_relative=False):
|
||
"""Used to create the config attribute by the Flask constructor.
|
||
The `instance_relative` parameter is passed in from the constructor
|
||
of Flask (there named `instance_relative_config`) and indicates if
|
||
the config should be relative to the instance path or the root path
|
||
of the application.
|
||
|
||
.. versionadded:: 0.8
|
||
"""
|
||
root_path = self.root_path
|
||
if instance_relative:
|
||
root_path = self.instance_path
|
||
return self.config_class(root_path, self.default_config)
|
||
|
||
def auto_find_instance_path(self):
|
||
"""Tries to locate the instance path if it was not provided to the
|
||
constructor of the application class. It will basically calculate
|
||
the path to a folder named ``instance`` next to your main file or
|
||
the package.
|
||
|
||
.. versionadded:: 0.8
|
||
"""
|
||
prefix, package_path = find_package(self.import_name)
|
||
if prefix is None:
|
||
return os.path.join(package_path, 'instance')
|
||
return os.path.join(prefix, 'var', self.name + '-instance')
|
||
|
||
def open_instance_resource(self, resource, mode='rb'):
|
||
"""Opens a resource from the application's instance folder
|
||
(:attr:`instance_path`). Otherwise works like
|
||
:meth:`open_resource`. Instance resources can also be opened for
|
||
writing.
|
||
|
||
:param resource: the name of the resource. To access resources within
|
||
subfolders use forward slashes as separator.
|
||
:param mode: resource file opening mode, default is 'rb'.
|
||
"""
|
||
return open(os.path.join(self.instance_path, resource), mode)
|
||
|
||
def create_jinja_environment(self):
|
||
"""Creates the Jinja2 environment based on :attr:`jinja_options`
|
||
and :meth:`select_jinja_autoescape`. Since 0.7 this also adds
|
||
the Jinja2 globals and filters after initialization. Override
|
||
this function to customize the behavior.
|
||
|
||
.. versionadded:: 0.5
|
||
.. versionchanged:: 0.11
|
||
``Environment.auto_reload`` set in accordance with
|
||
``TEMPLATES_AUTO_RELOAD`` configuration option.
|
||
"""
|
||
options = dict(self.jinja_options)
|
||
if 'autoescape' not in options:
|
||
options['autoescape'] = self.select_jinja_autoescape
|
||
if 'auto_reload' not in options:
|
||
if self.config['TEMPLATES_AUTO_RELOAD'] is not None:
|
||
options['auto_reload'] = self.config['TEMPLATES_AUTO_RELOAD']
|
||
else:
|
||
options['auto_reload'] = self.debug
|
||
rv = self.jinja_environment(self, **options)
|
||
rv.globals.update(
|
||
url_for=url_for,
|
||
get_flashed_messages=get_flashed_messages,
|
||
config=self.config,
|
||
# request, session and g are normally added with the
|
||
# context processor for efficiency reasons but for imported
|
||
# templates we also want the proxies in there.
|
||
request=request,
|
||
session=session,
|
||
g=g
|
||
)
|
||
rv.filters['tojson'] = json.tojson_filter
|
||
return rv
|
||
|
||
def create_global_jinja_loader(self):
|
||
"""Creates the loader for the Jinja2 environment. Can be used to
|
||
override just the loader and keeping the rest unchanged. It's
|
||
discouraged to override this function. Instead one should override
|
||
the :meth:`jinja_loader` function instead.
|
||
|
||
The global loader dispatches between the loaders of the application
|
||
and the individual blueprints.
|
||
|
||
.. versionadded:: 0.7
|
||
"""
|
||
return DispatchingJinjaLoader(self)
|
||
|
||
def init_jinja_globals(self):
|
||
"""Deprecated. Used to initialize the Jinja2 globals.
|
||
|
||
.. versionadded:: 0.5
|
||
.. versionchanged:: 0.7
|
||
This method is deprecated with 0.7. Override
|
||
:meth:`create_jinja_environment` instead.
|
||
"""
|
||
|
||
def select_jinja_autoescape(self, filename):
|
||
"""Returns ``True`` if autoescaping should be active for the given
|
||
template name. If no template name is given, returns `True`.
|
||
|
||
.. versionadded:: 0.5
|
||
"""
|
||
if filename is None:
|
||
return True
|
||
return filename.endswith(('.html', '.htm', '.xml', '.xhtml'))
|
||
|
||
def update_template_context(self, context):
|
||
"""Update the template context with some commonly used variables.
|
||
This injects request, session, config and g into the template
|
||
context as well as everything template context processors want
|
||
to inject. Note that the as of Flask 0.6, the original values
|
||
in the context will not be overridden if a context processor
|
||
decides to return a value with the same key.
|
||
|
||
:param context: the context as a dictionary that is updated in place
|
||
to add extra variables.
|
||
"""
|
||
funcs = self.template_context_processors[None]
|
||
reqctx = _request_ctx_stack.top
|
||
if reqctx is not None:
|
||
bp = reqctx.request.blueprint
|
||
if bp is not None and bp in self.template_context_processors:
|
||
funcs = chain(funcs, self.template_context_processors[bp])
|
||
orig_ctx = context.copy()
|
||
for func in funcs:
|
||
context.update(func())
|
||
# make sure the original values win. This makes it possible to
|
||
# easier add new variables in context processors without breaking
|
||
# existing views.
|
||
context.update(orig_ctx)
|
||
|
||
def make_shell_context(self):
|
||
"""Returns the shell context for an interactive shell for this
|
||
application. This runs all the registered shell context
|
||
processors.
|
||
|
||
.. versionadded:: 0.11
|
||
"""
|
||
rv = {'app': self, 'g': g}
|
||
for processor in self.shell_context_processors:
|
||
rv.update(processor())
|
||
return rv
|
||
|
||
def run(self, host=None, port=None, debug=None, **options):
|
||
"""Runs the application on a local development server.
|
||
|
||
Do not use ``run()`` in a production setting. It is not intended to
|
||
meet security and performance requirements for a production server.
|
||
Instead, see :ref:`deployment` for WSGI server recommendations.
|
||
|
||
If the :attr:`debug` flag is set the server will automatically reload
|
||
for code changes and show a debugger in case an exception happened.
|
||
|
||
If you want to run the application in debug mode, but disable the
|
||
code execution on the interactive debugger, you can pass
|
||
``use_evalex=False`` as parameter. This will keep the debugger's
|
||
traceback screen active, but disable code execution.
|
||
|
||
It is not recommended to use this function for development with
|
||
automatic reloading as this is badly supported. Instead you should
|
||
be using the :command:`flask` command line script's ``run`` support.
|
||
|
||
.. admonition:: Keep in Mind
|
||
|
||
Flask will suppress any server error with a generic error page
|
||
unless it is in debug mode. As such to enable just the
|
||
interactive debugger without the code reloading, you have to
|
||
invoke :meth:`run` with ``debug=True`` and ``use_reloader=False``.
|
||
Setting ``use_debugger`` to ``True`` without being in debug mode
|
||
won't catch any exceptions because there won't be any to
|
||
catch.
|
||
|
||
.. versionchanged:: 0.10
|
||
The default port is now picked from the ``SERVER_NAME`` variable.
|
||
|
||
:param host: the hostname to listen on. Set this to ``'0.0.0.0'`` to
|
||
have the server available externally as well. Defaults to
|
||
``'127.0.0.1'``.
|
||
:param port: the port of the webserver. Defaults to ``5000`` or the
|
||
port defined in the ``SERVER_NAME`` config variable if
|
||
present.
|
||
:param debug: if given, enable or disable debug mode.
|
||
See :attr:`debug`.
|
||
:param options: the options to be forwarded to the underlying
|
||
Werkzeug server. See
|
||
:func:`werkzeug.serving.run_simple` for more
|
||
information.
|
||
"""
|
||
from werkzeug.serving import run_simple
|
||
if host is None:
|
||
host = '127.0.0.1'
|
||
if port is None:
|
||
server_name = self.config['SERVER_NAME']
|
||
if server_name and ':' in server_name:
|
||
port = int(server_name.rsplit(':', 1)[1])
|
||
else:
|
||
port = 5000
|
||
if debug is not None:
|
||
self.debug = bool(debug)
|
||
options.setdefault('use_reloader', self.debug)
|
||
options.setdefault('use_debugger', self.debug)
|
||
options.setdefault('passthrough_errors', True)
|
||
try:
|
||
run_simple(host, port, self, **options)
|
||
finally:
|
||
# reset the first request information if the development server
|
||
# resetted normally. This makes it possible to restart the server
|
||
# without reloader and that stuff from an interactive shell.
|
||
self._got_first_request = False
|
||
|
||
def test_client(self, use_cookies=True, **kwargs):
|
||
"""Creates a test client for this application. For information
|
||
about unit testing head over to :ref:`testing`.
|
||
|
||
Note that if you are testing for assertions or exceptions in your
|
||
application code, you must set ``app.testing = True`` in order for the
|
||
exceptions to propagate to the test client. Otherwise, the exception
|
||
will be handled by the application (not visible to the test client) and
|
||
the only indication of an AssertionError or other exception will be a
|
||
500 status code response to the test client. See the :attr:`testing`
|
||
attribute. For example::
|
||
|
||
app.testing = True
|
||
client = app.test_client()
|
||
|
||
The test client can be used in a ``with`` block to defer the closing down
|
||
of the context until the end of the ``with`` block. This is useful if
|
||
you want to access the context locals for testing::
|
||
|
||
with app.test_client() as c:
|
||
rv = c.get('/?vodka=42')
|
||
assert request.args['vodka'] == '42'
|
||
|
||
Additionally, you may pass optional keyword arguments that will then
|
||
be passed to the application's :attr:`test_client_class` constructor.
|
||
For example::
|
||
|
||
from flask.testing import FlaskClient
|
||
|
||
class CustomClient(FlaskClient):
|
||
def __init__(self, authentication=None, *args, **kwargs):
|
||
FlaskClient.__init__(*args, **kwargs)
|
||
self._authentication = authentication
|
||
|
||
app.test_client_class = CustomClient
|
||
client = app.test_client(authentication='Basic ....')
|
||
|
||
See :class:`~flask.testing.FlaskClient` for more information.
|
||
|
||
.. versionchanged:: 0.4
|
||
added support for ``with`` block usage for the client.
|
||
|
||
.. versionadded:: 0.7
|
||
The `use_cookies` parameter was added as well as the ability
|
||
to override the client to be used by setting the
|
||
:attr:`test_client_class` attribute.
|
||
|
||
.. versionchanged:: 0.11
|
||
Added `**kwargs` to support passing additional keyword arguments to
|
||
the constructor of :attr:`test_client_class`.
|
||
"""
|
||
cls = self.test_client_class
|
||
if cls is None:
|
||
from flask.testing import FlaskClient as cls
|
||
return cls(self, self.response_class, use_cookies=use_cookies, **kwargs)
|
||
|
||
def open_session(self, request):
|
||
"""Creates or opens a new session. Default implementation stores all
|
||
session data in a signed cookie. This requires that the
|
||
:attr:`secret_key` is set. Instead of overriding this method
|
||
we recommend replacing the :class:`session_interface`.
|
||
|
||
:param request: an instance of :attr:`request_class`.
|
||
"""
|
||
return self.session_interface.open_session(self, request)
|
||
|
||
def save_session(self, session, response):
|
||
"""Saves the session if it needs updates. For the default
|
||
implementation, check :meth:`open_session`. Instead of overriding this
|
||
method we recommend replacing the :class:`session_interface`.
|
||
|
||
:param session: the session to be saved (a
|
||
:class:`~werkzeug.contrib.securecookie.SecureCookie`
|
||
object)
|
||
:param response: an instance of :attr:`response_class`
|
||
"""
|
||
return self.session_interface.save_session(self, session, response)
|
||
|
||
def make_null_session(self):
|
||
"""Creates a new instance of a missing session. Instead of overriding
|
||
this method we recommend replacing the :class:`session_interface`.
|
||
|
||
.. versionadded:: 0.7
|
||
"""
|
||
return self.session_interface.make_null_session(self)
|
||
|
||
@setupmethod
|
||
def register_blueprint(self, blueprint, **options):
|
||
"""Register a blueprint on the application. For information about
|
||
blueprints head over to :ref:`blueprints`.
|
||
|
||
The blueprint name is passed in as the first argument.
|
||
Options are passed as additional keyword arguments and forwarded to
|
||
`blueprints` in an "options" dictionary.
|
||
|
||
:param subdomain: set a subdomain for the blueprint
|
||
:param url_prefix: set the prefix for all URLs defined on the blueprint.
|
||
``(url_prefix='/<lang code>')``
|
||
:param url_defaults: a dictionary with URL defaults that is added to
|
||
each and every URL defined with this blueprint
|
||
:param static_folder: add a static folder to urls in this blueprint
|
||
:param static_url_path: add a static url path to urls in this blueprint
|
||
:param template_folder: set an alternate template folder
|
||
:param root_path: set an alternate root path for this blueprint
|
||
|
||
.. versionadded:: 0.7
|
||
"""
|
||
first_registration = False
|
||
if blueprint.name in self.blueprints:
|
||
assert self.blueprints[blueprint.name] is blueprint, \
|
||
'A blueprint\'s name collision occurred between %r and ' \
|
||
'%r. Both share the same name "%s". Blueprints that ' \
|
||
'are created on the fly need unique names.' % \
|
||
(blueprint, self.blueprints[blueprint.name], blueprint.name)
|
||
else:
|
||
self.blueprints[blueprint.name] = blueprint
|
||
self._blueprint_order.append(blueprint)
|
||
first_registration = True
|
||
blueprint.register(self, options, first_registration)
|
||
|
||
def iter_blueprints(self):
|
||
"""Iterates over all blueprints by the order they were registered.
|
||
|
||
.. versionadded:: 0.11
|
||
"""
|
||
return iter(self._blueprint_order)
|
||
|
||
@setupmethod
|
||
def add_url_rule(self, rule, endpoint=None, view_func=None, **options):
|
||
"""Connects a URL rule. Works exactly like the :meth:`route`
|
||
decorator. If a view_func is provided it will be registered with the
|
||
endpoint.
|
||
|
||
Basically this example::
|
||
|
||
@app.route('/')
|
||
def index():
|
||
pass
|
||
|
||
Is equivalent to the following::
|
||
|
||
def index():
|
||
pass
|
||
app.add_url_rule('/', 'index', index)
|
||
|
||
If the view_func is not provided you will need to connect the endpoint
|
||
to a view function like so::
|
||
|
||
app.view_functions['index'] = index
|
||
|
||
Internally :meth:`route` invokes :meth:`add_url_rule` so if you want
|
||
to customize the behavior via subclassing you only need to change
|
||
this method.
|
||
|
||
For more information refer to :ref:`url-route-registrations`.
|
||
|
||
.. versionchanged:: 0.2
|
||
`view_func` parameter added.
|
||
|
||
.. versionchanged:: 0.6
|
||
``OPTIONS`` is added automatically as method.
|
||
|
||
:param rule: the URL rule as string
|
||
:param endpoint: the endpoint for the registered URL rule. Flask
|
||
itself assumes the name of the view function as
|
||
endpoint
|
||
:param view_func: the function to call when serving a request to the
|
||
provided endpoint
|
||
:param options: the options to be forwarded to the underlying
|
||
:class:`~werkzeug.routing.Rule` object. A change
|
||
to Werkzeug is handling of method options. methods
|
||
is a list of methods this rule should be limited
|
||
to (``GET``, ``POST`` etc.). By default a rule
|
||
just listens for ``GET`` (and implicitly ``HEAD``).
|
||
Starting with Flask 0.6, ``OPTIONS`` is implicitly
|
||
added and handled by the standard request handling.
|
||
"""
|
||
if endpoint is None:
|
||
endpoint = _endpoint_from_view_func(view_func)
|
||
options['endpoint'] = endpoint
|
||
methods = options.pop('methods', None)
|
||
|
||
# if the methods are not given and the view_func object knows its
|
||
# methods we can use that instead. If neither exists, we go with
|
||
# a tuple of only ``GET`` as default.
|
||
if methods is None:
|
||
methods = getattr(view_func, 'methods', None) or ('GET',)
|
||
if isinstance(methods, string_types):
|
||
raise TypeError('Allowed methods have to be iterables of strings, '
|
||
'for example: @app.route(..., methods=["POST"])')
|
||
methods = set(item.upper() for item in methods)
|
||
|
||
# Methods that should always be added
|
||
required_methods = set(getattr(view_func, 'required_methods', ()))
|
||
|
||
# starting with Flask 0.8 the view_func object can disable and
|
||
# force-enable the automatic options handling.
|
||
provide_automatic_options = getattr(view_func,
|
||
'provide_automatic_options', None)
|
||
|
||
if provide_automatic_options is None:
|
||
if 'OPTIONS' not in methods:
|
||
provide_automatic_options = True
|
||
required_methods.add('OPTIONS')
|
||
else:
|
||
provide_automatic_options = False
|
||
|
||
# Add the required methods now.
|
||
methods |= required_methods
|
||
|
||
rule = self.url_rule_class(rule, methods=methods, **options)
|
||
rule.provide_automatic_options = provide_automatic_options
|
||
|
||
self.url_map.add(rule)
|
||
if view_func is not None:
|
||
old_func = self.view_functions.get(endpoint)
|
||
if old_func is not None and old_func != view_func:
|
||
raise AssertionError('View function mapping is overwriting an '
|
||
'existing endpoint function: %s' % endpoint)
|
||
self.view_functions[endpoint] = view_func
|
||
|
||
def route(self, rule, **options):
|
||
"""A decorator that is used to register a view function for a
|
||
given URL rule. This does the same thing as :meth:`add_url_rule`
|
||
but is intended for decorator usage::
|
||
|
||
@app.route('/')
|
||
def index():
|
||
return 'Hello World'
|
||
|
||
For more information refer to :ref:`url-route-registrations`.
|
||
|
||
:param rule: the URL rule as string
|
||
:param endpoint: the endpoint for the registered URL rule. Flask
|
||
itself assumes the name of the view function as
|
||
endpoint
|
||
:param options: the options to be forwarded to the underlying
|
||
:class:`~werkzeug.routing.Rule` object. A change
|
||
to Werkzeug is handling of method options. methods
|
||
is a list of methods this rule should be limited
|
||
to (``GET``, ``POST`` etc.). By default a rule
|
||
just listens for ``GET`` (and implicitly ``HEAD``).
|
||
Starting with Flask 0.6, ``OPTIONS`` is implicitly
|
||
added and handled by the standard request handling.
|
||
"""
|
||
def decorator(f):
|
||
endpoint = options.pop('endpoint', None)
|
||
self.add_url_rule(rule, endpoint, f, **options)
|
||
return f
|
||
return decorator
|
||
|
||
@setupmethod
|
||
def endpoint(self, endpoint):
|
||
"""A decorator to register a function as an endpoint.
|
||
Example::
|
||
|
||
@app.endpoint('example.endpoint')
|
||
def example():
|
||
return "example"
|
||
|
||
:param endpoint: the name of the endpoint
|
||
"""
|
||
def decorator(f):
|
||
self.view_functions[endpoint] = f
|
||
return f
|
||
return decorator
|
||
|
||
@staticmethod
|
||
def _get_exc_class_and_code(exc_class_or_code):
|
||
"""Ensure that we register only exceptions as handler keys"""
|
||
if isinstance(exc_class_or_code, integer_types):
|
||
exc_class = default_exceptions[exc_class_or_code]
|
||
else:
|
||
exc_class = exc_class_or_code
|
||
|
||
assert issubclass(exc_class, Exception)
|
||
|
||
if issubclass(exc_class, HTTPException):
|
||
return exc_class, exc_class.code
|
||
else:
|
||
return exc_class, None
|
||
|
||
@setupmethod
|
||
def errorhandler(self, code_or_exception):
|
||
"""A decorator that is used to register a function give a given
|
||
error code. Example::
|
||
|
||
@app.errorhandler(404)
|
||
def page_not_found(error):
|
||
return 'This page does not exist', 404
|
||
|
||
You can also register handlers for arbitrary exceptions::
|
||
|
||
@app.errorhandler(DatabaseError)
|
||
def special_exception_handler(error):
|
||
return 'Database connection failed', 500
|
||
|
||
You can also register a function as error handler without using
|
||
the :meth:`errorhandler` decorator. The following example is
|
||
equivalent to the one above::
|
||
|
||
def page_not_found(error):
|
||
return 'This page does not exist', 404
|
||
app.error_handler_spec[None][404] = page_not_found
|
||
|
||
Setting error handlers via assignments to :attr:`error_handler_spec`
|
||
however is discouraged as it requires fiddling with nested dictionaries
|
||
and the special case for arbitrary exception types.
|
||
|
||
The first ``None`` refers to the active blueprint. If the error
|
||
handler should be application wide ``None`` shall be used.
|
||
|
||
.. versionadded:: 0.7
|
||
Use :meth:`register_error_handler` instead of modifying
|
||
:attr:`error_handler_spec` directly, for application wide error
|
||
handlers.
|
||
|
||
.. versionadded:: 0.7
|
||
One can now additionally also register custom exception types
|
||
that do not necessarily have to be a subclass of the
|
||
:class:`~werkzeug.exceptions.HTTPException` class.
|
||
|
||
:param code: the code as integer for the handler
|
||
"""
|
||
def decorator(f):
|
||
self._register_error_handler(None, code_or_exception, f)
|
||
return f
|
||
return decorator
|
||
|
||
def register_error_handler(self, code_or_exception, f):
|
||
"""Alternative error attach function to the :meth:`errorhandler`
|
||
decorator that is more straightforward to use for non decorator
|
||
usage.
|
||
|
||
.. versionadded:: 0.7
|
||
"""
|
||
self._register_error_handler(None, code_or_exception, f)
|
||
|
||
@setupmethod
|
||
def _register_error_handler(self, key, code_or_exception, f):
|
||
"""
|
||
:type key: None|str
|
||
:type code_or_exception: int|T<=Exception
|
||
:type f: callable
|
||
"""
|
||
if isinstance(code_or_exception, HTTPException): # old broken behavior
|
||
raise ValueError(
|
||
'Tried to register a handler for an exception instance {0!r}. '
|
||
'Handlers can only be registered for exception classes or HTTP error codes.'
|
||
.format(code_or_exception))
|
||
|
||
exc_class, code = self._get_exc_class_and_code(code_or_exception)
|
||
|
||
handlers = self.error_handler_spec.setdefault(key, {}).setdefault(code, {})
|
||
handlers[exc_class] = f
|
||
|
||
@setupmethod
|
||
def template_filter(self, name=None):
|
||
"""A decorator that is used to register custom template filter.
|
||
You can specify a name for the filter, otherwise the function
|
||
name will be used. Example::
|
||
|
||
@app.template_filter()
|
||
def reverse(s):
|
||
return s[::-1]
|
||
|
||
:param name: the optional name of the filter, otherwise the
|
||
function name will be used.
|
||
"""
|
||
def decorator(f):
|
||
self.add_template_filter(f, name=name)
|
||
return f
|
||
return decorator
|
||
|
||
@setupmethod
|
||
def add_template_filter(self, f, name=None):
|
||
"""Register a custom template filter. Works exactly like the
|
||
:meth:`template_filter` decorator.
|
||
|
||
:param name: the optional name of the filter, otherwise the
|
||
function name will be used.
|
||
"""
|
||
self.jinja_env.filters[name or f.__name__] = f
|
||
|
||
@setupmethod
|
||
def template_test(self, name=None):
|
||
"""A decorator that is used to register custom template test.
|
||
You can specify a name for the test, otherwise the function
|
||
name will be used. Example::
|
||
|
||
@app.template_test()
|
||
def is_prime(n):
|
||
if n == 2:
|
||
return True
|
||
for i in range(2, int(math.ceil(math.sqrt(n))) + 1):
|
||
if n % i == 0:
|
||
return False
|
||
return True
|
||
|
||
.. versionadded:: 0.10
|
||
|
||
:param name: the optional name of the test, otherwise the
|
||
function name will be used.
|
||
"""
|
||
def decorator(f):
|
||
self.add_template_test(f, name=name)
|
||
return f
|
||
return decorator
|
||
|
||
@setupmethod
|
||
def add_template_test(self, f, name=None):
|
||
"""Register a custom template test. Works exactly like the
|
||
:meth:`template_test` decorator.
|
||
|
||
.. versionadded:: 0.10
|
||
|
||
:param name: the optional name of the test, otherwise the
|
||
function name will be used.
|
||
"""
|
||
self.jinja_env.tests[name or f.__name__] = f
|
||
|
||
@setupmethod
|
||
def template_global(self, name=None):
|
||
"""A decorator that is used to register a custom template global function.
|
||
You can specify a name for the global function, otherwise the function
|
||
name will be used. Example::
|
||
|
||
@app.template_global()
|
||
def double(n):
|
||
return 2 * n
|
||
|
||
.. versionadded:: 0.10
|
||
|
||
:param name: the optional name of the global function, otherwise the
|
||
function name will be used.
|
||
"""
|
||
def decorator(f):
|
||
self.add_template_global(f, name=name)
|
||
return f
|
||
return decorator
|
||
|
||
@setupmethod
|
||
def add_template_global(self, f, name=None):
|
||
"""Register a custom template global function. Works exactly like the
|
||
:meth:`template_global` decorator.
|
||
|
||
.. versionadded:: 0.10
|
||
|
||
:param name: the optional name of the global function, otherwise the
|
||
function name will be used.
|
||
"""
|
||
self.jinja_env.globals[name or f.__name__] = f
|
||
|
||
@setupmethod
|
||
def before_request(self, f):
|
||
"""Registers a function to run before each request.
|
||
|
||
The function will be called without any arguments.
|
||
If the function returns a non-None value, it's handled as
|
||
if it was the return value from the view and further
|
||
request handling is stopped.
|
||
"""
|
||
self.before_request_funcs.setdefault(None, []).append(f)
|
||
return f
|
||
|
||
@setupmethod
|
||
def before_first_request(self, f):
|
||
"""Registers a function to be run before the first request to this
|
||
instance of the application.
|
||
|
||
The function will be called without any arguments and its return
|
||
value is ignored.
|
||
|
||
.. versionadded:: 0.8
|
||
"""
|
||
self.before_first_request_funcs.append(f)
|
||
return f
|
||
|
||
@setupmethod
|
||
def after_request(self, f):
|
||
"""Register a function to be run after each request.
|
||
|
||
Your function must take one parameter, an instance of
|
||
:attr:`response_class` and return a new response object or the
|
||
same (see :meth:`process_response`).
|
||
|
||
As of Flask 0.7 this function might not be executed at the end of the
|
||
request in case an unhandled exception occurred.
|
||
"""
|
||
self.after_request_funcs.setdefault(None, []).append(f)
|
||
return f
|
||
|
||
@setupmethod
|
||
def teardown_request(self, f):
|
||
"""Register a function to be run at the end of each request,
|
||
regardless of whether there was an exception or not. These functions
|
||
are executed when the request context is popped, even if not an
|
||
actual request was performed.
|
||
|
||
Example::
|
||
|
||
ctx = app.test_request_context()
|
||
ctx.push()
|
||
...
|
||
ctx.pop()
|
||
|
||
When ``ctx.pop()`` is executed in the above example, the teardown
|
||
functions are called just before the request context moves from the
|
||
stack of active contexts. This becomes relevant if you are using
|
||
such constructs in tests.
|
||
|
||
Generally teardown functions must take every necessary step to avoid
|
||
that they will fail. If they do execute code that might fail they
|
||
will have to surround the execution of these code by try/except
|
||
statements and log occurring errors.
|
||
|
||
When a teardown function was called because of a exception it will
|
||
be passed an error object.
|
||
|
||
The return values of teardown functions are ignored.
|
||
|
||
.. admonition:: Debug Note
|
||
|
||
In debug mode Flask will not tear down a request on an exception
|
||
immediately. Instead it will keep it alive so that the interactive
|
||
debugger can still access it. This behavior can be controlled
|
||
by the ``PRESERVE_CONTEXT_ON_EXCEPTION`` configuration variable.
|
||
"""
|
||
self.teardown_request_funcs.setdefault(None, []).append(f)
|
||
return f
|
||
|
||
@setupmethod
|
||
def teardown_appcontext(self, f):
|
||
"""Registers a function to be called when the application context
|
||
ends. These functions are typically also called when the request
|
||
context is popped.
|
||
|
||
Example::
|
||
|
||
ctx = app.app_context()
|
||
ctx.push()
|
||
...
|
||
ctx.pop()
|
||
|
||
When ``ctx.pop()`` is executed in the above example, the teardown
|
||
functions are called just before the app context moves from the
|
||
stack of active contexts. This becomes relevant if you are using
|
||
such constructs in tests.
|
||
|
||
Since a request context typically also manages an application
|
||
context it would also be called when you pop a request context.
|
||
|
||
When a teardown function was called because of an exception it will
|
||
be passed an error object.
|
||
|
||
The return values of teardown functions are ignored.
|
||
|
||
.. versionadded:: 0.9
|
||
"""
|
||
self.teardown_appcontext_funcs.append(f)
|
||
return f
|
||
|
||
@setupmethod
|
||
def context_processor(self, f):
|
||
"""Registers a template context processor function."""
|
||
self.template_context_processors[None].append(f)
|
||
return f
|
||
|
||
@setupmethod
|
||
def shell_context_processor(self, f):
|
||
"""Registers a shell context processor function.
|
||
|
||
.. versionadded:: 0.11
|
||
"""
|
||
self.shell_context_processors.append(f)
|
||
return f
|
||
|
||
@setupmethod
|
||
def url_value_preprocessor(self, f):
|
||
"""Registers a function as URL value preprocessor for all view
|
||
functions of the application. It's called before the view functions
|
||
are called and can modify the url values provided.
|
||
"""
|
||
self.url_value_preprocessors.setdefault(None, []).append(f)
|
||
return f
|
||
|
||
@setupmethod
|
||
def url_defaults(self, f):
|
||
"""Callback function for URL defaults for all view functions of the
|
||
application. It's called with the endpoint and values and should
|
||
update the values passed in place.
|
||
"""
|
||
self.url_default_functions.setdefault(None, []).append(f)
|
||
return f
|
||
|
||
def _find_error_handler(self, e):
|
||
"""Finds a registered error handler for the request’s blueprint.
|
||
Otherwise falls back to the app, returns None if not a suitable
|
||
handler is found.
|
||
"""
|
||
exc_class, code = self._get_exc_class_and_code(type(e))
|
||
|
||
def find_handler(handler_map):
|
||
if not handler_map:
|
||
return
|
||
queue = deque(exc_class.__mro__)
|
||
# Protect from geniuses who might create circular references in
|
||
# __mro__
|
||
done = set()
|
||
|
||
while queue:
|
||
cls = queue.popleft()
|
||
if cls in done:
|
||
continue
|
||
done.add(cls)
|
||
handler = handler_map.get(cls)
|
||
if handler is not None:
|
||
# cache for next time exc_class is raised
|
||
handler_map[exc_class] = handler
|
||
return handler
|
||
|
||
queue.extend(cls.__mro__)
|
||
|
||
# try blueprint handlers
|
||
handler = find_handler(self.error_handler_spec
|
||
.get(request.blueprint, {})
|
||
.get(code))
|
||
if handler is not None:
|
||
return handler
|
||
|
||
# fall back to app handlers
|
||
return find_handler(self.error_handler_spec[None].get(code))
|
||
|
||
def handle_http_exception(self, e):
|
||
"""Handles an HTTP exception. By default this will invoke the
|
||
registered error handlers and fall back to returning the
|
||
exception as response.
|
||
|
||
.. versionadded:: 0.3
|
||
"""
|
||
# Proxy exceptions don't have error codes. We want to always return
|
||
# those unchanged as errors
|
||
if e.code is None:
|
||
return e
|
||
|
||
handler = self._find_error_handler(e)
|
||
if handler is None:
|
||
return e
|
||
return handler(e)
|
||
|
||
def trap_http_exception(self, e):
|
||
"""Checks if an HTTP exception should be trapped or not. By default
|
||
this will return ``False`` for all exceptions except for a bad request
|
||
key error if ``TRAP_BAD_REQUEST_ERRORS`` is set to ``True``. It
|
||
also returns ``True`` if ``TRAP_HTTP_EXCEPTIONS`` is set to ``True``.
|
||
|
||
This is called for all HTTP exceptions raised by a view function.
|
||
If it returns ``True`` for any exception the error handler for this
|
||
exception is not called and it shows up as regular exception in the
|
||
traceback. This is helpful for debugging implicitly raised HTTP
|
||
exceptions.
|
||
|
||
.. versionadded:: 0.8
|
||
"""
|
||
if self.config['TRAP_HTTP_EXCEPTIONS']:
|
||
return True
|
||
if self.config['TRAP_BAD_REQUEST_ERRORS']:
|
||
return isinstance(e, BadRequest)
|
||
return False
|
||
|
||
def handle_user_exception(self, e):
|
||
"""This method is called whenever an exception occurs that should be
|
||
handled. A special case are
|
||
:class:`~werkzeug.exception.HTTPException`\s which are forwarded by
|
||
this function to the :meth:`handle_http_exception` method. This
|
||
function will either return a response value or reraise the
|
||
exception with the same traceback.
|
||
|
||
.. versionadded:: 0.7
|
||
"""
|
||
exc_type, exc_value, tb = sys.exc_info()
|
||
assert exc_value is e
|
||
|
||
# ensure not to trash sys.exc_info() at that point in case someone
|
||
# wants the traceback preserved in handle_http_exception. Of course
|
||
# we cannot prevent users from trashing it themselves in a custom
|
||
# trap_http_exception method so that's their fault then.
|
||
|
||
if isinstance(e, HTTPException) and not self.trap_http_exception(e):
|
||
return self.handle_http_exception(e)
|
||
|
||
handler = self._find_error_handler(e)
|
||
|
||
if handler is None:
|
||
reraise(exc_type, exc_value, tb)
|
||
return handler(e)
|
||
|
||
def handle_exception(self, e):
|
||
"""Default exception handling that kicks in when an exception
|
||
occurs that is not caught. In debug mode the exception will
|
||
be re-raised immediately, otherwise it is logged and the handler
|
||
for a 500 internal server error is used. If no such handler
|
||
exists, a default 500 internal server error message is displayed.
|
||
|
||
.. versionadded:: 0.3
|
||
"""
|
||
exc_type, exc_value, tb = sys.exc_info()
|
||
|
||
got_request_exception.send(self, exception=e)
|
||
handler = self._find_error_handler(InternalServerError())
|
||
|
||
if self.propagate_exceptions:
|
||
# if we want to repropagate the exception, we can attempt to
|
||
# raise it with the whole traceback in case we can do that
|
||
# (the function was actually called from the except part)
|
||
# otherwise, we just raise the error again
|
||
if exc_value is e:
|
||
reraise(exc_type, exc_value, tb)
|
||
else:
|
||
raise e
|
||
|
||
self.log_exception((exc_type, exc_value, tb))
|
||
if handler is None:
|
||
return InternalServerError()
|
||
return handler(e)
|
||
|
||
def log_exception(self, exc_info):
|
||
"""Logs an exception. This is called by :meth:`handle_exception`
|
||
if debugging is disabled and right before the handler is called.
|
||
The default implementation logs the exception as error on the
|
||
:attr:`logger`.
|
||
|
||
.. versionadded:: 0.8
|
||
"""
|
||
self.logger.error('Exception on %s [%s]' % (
|
||
request.path,
|
||
request.method
|
||
), exc_info=exc_info)
|
||
|
||
def raise_routing_exception(self, request):
|
||
"""Exceptions that are recording during routing are reraised with
|
||
this method. During debug we are not reraising redirect requests
|
||
for non ``GET``, ``HEAD``, or ``OPTIONS`` requests and we're raising
|
||
a different error instead to help debug situations.
|
||
|
||
:internal:
|
||
"""
|
||
if not self.debug \
|
||
or not isinstance(request.routing_exception, RequestRedirect) \
|
||
or request.method in ('GET', 'HEAD', 'OPTIONS'):
|
||
raise request.routing_exception
|
||
|
||
from .debughelpers import FormDataRoutingRedirect
|
||
raise FormDataRoutingRedirect(request)
|
||
|
||
def dispatch_request(self):
|
||
"""Does the request dispatching. Matches the URL and returns the
|
||
return value of the view or error handler. This does not have to
|
||
be a response object. In order to convert the return value to a
|
||
proper response object, call :func:`make_response`.
|
||
|
||
.. versionchanged:: 0.7
|
||
This no longer does the exception handling, this code was
|
||
moved to the new :meth:`full_dispatch_request`.
|
||
"""
|
||
req = _request_ctx_stack.top.request
|
||
if req.routing_exception is not None:
|
||
self.raise_routing_exception(req)
|
||
rule = req.url_rule
|
||
# if we provide automatic options for this URL and the
|
||
# request came with the OPTIONS method, reply automatically
|
||
if getattr(rule, 'provide_automatic_options', False) \
|
||
and req.method == 'OPTIONS':
|
||
return self.make_default_options_response()
|
||
# otherwise dispatch to the handler for that endpoint
|
||
return self.view_functions[rule.endpoint](**req.view_args)
|
||
|
||
def full_dispatch_request(self):
|
||
"""Dispatches the request and on top of that performs request
|
||
pre and postprocessing as well as HTTP exception catching and
|
||
error handling.
|
||
|
||
.. versionadded:: 0.7
|
||
"""
|
||
self.try_trigger_before_first_request_functions()
|
||
try:
|
||
request_started.send(self)
|
||
rv = self.preprocess_request()
|
||
if rv is None:
|
||
rv = self.dispatch_request()
|
||
except Exception as e:
|
||
rv = self.handle_user_exception(e)
|
||
response = self.make_response(rv)
|
||
response = self.process_response(response)
|
||
request_finished.send(self, response=response)
|
||
return response
|
||
|
||
def try_trigger_before_first_request_functions(self):
|
||
"""Called before each request and will ensure that it triggers
|
||
the :attr:`before_first_request_funcs` and only exactly once per
|
||
application instance (which means process usually).
|
||
|
||
:internal:
|
||
"""
|
||
if self._got_first_request:
|
||
return
|
||
with self._before_request_lock:
|
||
if self._got_first_request:
|
||
return
|
||
for func in self.before_first_request_funcs:
|
||
func()
|
||
self._got_first_request = True
|
||
|
||
def make_default_options_response(self):
|
||
"""This method is called to create the default ``OPTIONS`` response.
|
||
This can be changed through subclassing to change the default
|
||
behavior of ``OPTIONS`` responses.
|
||
|
||
.. versionadded:: 0.7
|
||
"""
|
||
adapter = _request_ctx_stack.top.url_adapter
|
||
if hasattr(adapter, 'allowed_methods'):
|
||
methods = adapter.allowed_methods()
|
||
else:
|
||
# fallback for Werkzeug < 0.7
|
||
methods = []
|
||
try:
|
||
adapter.match(method='--')
|
||
except MethodNotAllowed as e:
|
||
methods = e.valid_methods
|
||
except HTTPException as e:
|
||
pass
|
||
rv = self.response_class()
|
||
rv.allow.update(methods)
|
||
return rv
|
||
|
||
def should_ignore_error(self, error):
|
||
"""This is called to figure out if an error should be ignored
|
||
or not as far as the teardown system is concerned. If this
|
||
function returns ``True`` then the teardown handlers will not be
|
||
passed the error.
|
||
|
||
.. versionadded:: 0.10
|
||
"""
|
||
return False
|
||
|
||
def make_response(self, rv):
|
||
"""Converts the return value from a view function to a real
|
||
response object that is an instance of :attr:`response_class`.
|
||
|
||
The following types are allowed for `rv`:
|
||
|
||
.. tabularcolumns:: |p{3.5cm}|p{9.5cm}|
|
||
|
||
======================= ===========================================
|
||
:attr:`response_class` the object is returned unchanged
|
||
:class:`str` a response object is created with the
|
||
string as body
|
||
:class:`unicode` a response object is created with the
|
||
string encoded to utf-8 as body
|
||
a WSGI function the function is called as WSGI application
|
||
and buffered as response object
|
||
:class:`tuple` A tuple in the form ``(response, status,
|
||
headers)`` or ``(response, headers)``
|
||
where `response` is any of the
|
||
types defined here, `status` is a string
|
||
or an integer and `headers` is a list or
|
||
a dictionary with header values.
|
||
======================= ===========================================
|
||
|
||
:param rv: the return value from the view function
|
||
|
||
.. versionchanged:: 0.9
|
||
Previously a tuple was interpreted as the arguments for the
|
||
response object.
|
||
"""
|
||
status_or_headers = headers = None
|
||
if isinstance(rv, tuple):
|
||
rv, status_or_headers, headers = rv + (None,) * (3 - len(rv))
|
||
|
||
if rv is None:
|
||
raise ValueError('View function did not return a response')
|
||
|
||
if isinstance(status_or_headers, (dict, list)):
|
||
headers, status_or_headers = status_or_headers, None
|
||
|
||
if not isinstance(rv, self.response_class):
|
||
# When we create a response object directly, we let the constructor
|
||
# set the headers and status. We do this because there can be
|
||
# some extra logic involved when creating these objects with
|
||
# specific values (like default content type selection).
|
||
if isinstance(rv, (text_type, bytes, bytearray)):
|
||
rv = self.response_class(rv, headers=headers,
|
||
status=status_or_headers)
|
||
headers = status_or_headers = None
|
||
else:
|
||
rv = self.response_class.force_type(rv, request.environ)
|
||
|
||
if status_or_headers is not None:
|
||
if isinstance(status_or_headers, string_types):
|
||
rv.status = status_or_headers
|
||
else:
|
||
rv.status_code = status_or_headers
|
||
if headers:
|
||
rv.headers.extend(headers)
|
||
|
||
return rv
|
||
|
||
def create_url_adapter(self, request):
|
||
"""Creates a URL adapter for the given request. The URL adapter
|
||
is created at a point where the request context is not yet set up
|
||
so the request is passed explicitly.
|
||
|
||
.. versionadded:: 0.6
|
||
|
||
.. versionchanged:: 0.9
|
||
This can now also be called without a request object when the
|
||
URL adapter is created for the application context.
|
||
"""
|
||
if request is not None:
|
||
return self.url_map.bind_to_environ(request.environ,
|
||
server_name=self.config['SERVER_NAME'])
|
||
# We need at the very least the server name to be set for this
|
||
# to work.
|
||
if self.config['SERVER_NAME'] is not None:
|
||
return self.url_map.bind(
|
||
self.config['SERVER_NAME'],
|
||
script_name=self.config['APPLICATION_ROOT'] or '/',
|
||
url_scheme=self.config['PREFERRED_URL_SCHEME'])
|
||
|
||
def inject_url_defaults(self, endpoint, values):
|
||
"""Injects the URL defaults for the given endpoint directly into
|
||
the values dictionary passed. This is used internally and
|
||
automatically called on URL building.
|
||
|
||
.. versionadded:: 0.7
|
||
"""
|
||
funcs = self.url_default_functions.get(None, ())
|
||
if '.' in endpoint:
|
||
bp = endpoint.rsplit('.', 1)[0]
|
||
funcs = chain(funcs, self.url_default_functions.get(bp, ()))
|
||
for func in funcs:
|
||
func(endpoint, values)
|
||
|
||
def handle_url_build_error(self, error, endpoint, values):
|
||
"""Handle :class:`~werkzeug.routing.BuildError` on :meth:`url_for`.
|
||
"""
|
||
exc_type, exc_value, tb = sys.exc_info()
|
||
for handler in self.url_build_error_handlers:
|
||
try:
|
||
rv = handler(error, endpoint, values)
|
||
if rv is not None:
|
||
return rv
|
||
except BuildError as e:
|
||
# make error available outside except block (py3)
|
||
error = e
|
||
|
||
# At this point we want to reraise the exception. If the error is
|
||
# still the same one we can reraise it with the original traceback,
|
||
# otherwise we raise it from here.
|
||
if error is exc_value:
|
||
reraise(exc_type, exc_value, tb)
|
||
raise error
|
||
|
||
def preprocess_request(self):
|
||
"""Called before the actual request dispatching and will
|
||
call each :meth:`before_request` decorated function, passing no
|
||
arguments.
|
||
If any of these functions returns a value, it's handled as
|
||
if it was the return value from the view and further
|
||
request handling is stopped.
|
||
|
||
This also triggers the :meth:`url_value_processor` functions before
|
||
the actual :meth:`before_request` functions are called.
|
||
"""
|
||
bp = _request_ctx_stack.top.request.blueprint
|
||
|
||
funcs = self.url_value_preprocessors.get(None, ())
|
||
if bp is not None and bp in self.url_value_preprocessors:
|
||
funcs = chain(funcs, self.url_value_preprocessors[bp])
|
||
for func in funcs:
|
||
func(request.endpoint, request.view_args)
|
||
|
||
funcs = self.before_request_funcs.get(None, ())
|
||
if bp is not None and bp in self.before_request_funcs:
|
||
funcs = chain(funcs, self.before_request_funcs[bp])
|
||
for func in funcs:
|
||
rv = func()
|
||
if rv is not None:
|
||
return rv
|
||
|
||
def process_response(self, response):
|
||
"""Can be overridden in order to modify the response object
|
||
before it's sent to the WSGI server. By default this will
|
||
call all the :meth:`after_request` decorated functions.
|
||
|
||
.. versionchanged:: 0.5
|
||
As of Flask 0.5 the functions registered for after request
|
||
execution are called in reverse order of registration.
|
||
|
||
:param response: a :attr:`response_class` object.
|
||
:return: a new response object or the same, has to be an
|
||
instance of :attr:`response_class`.
|
||
"""
|
||
ctx = _request_ctx_stack.top
|
||
bp = ctx.request.blueprint
|
||
funcs = ctx._after_request_functions
|
||
if bp is not None and bp in self.after_request_funcs:
|
||
funcs = chain(funcs, reversed(self.after_request_funcs[bp]))
|
||
if None in self.after_request_funcs:
|
||
funcs = chain(funcs, reversed(self.after_request_funcs[None]))
|
||
for handler in funcs:
|
||
response = handler(response)
|
||
if not self.session_interface.is_null_session(ctx.session):
|
||
self.save_session(ctx.session, response)
|
||
return response
|
||
|
||
def do_teardown_request(self, exc=_sentinel):
|
||
"""Called after the actual request dispatching and will
|
||
call every as :meth:`teardown_request` decorated function. This is
|
||
not actually called by the :class:`Flask` object itself but is always
|
||
triggered when the request context is popped. That way we have a
|
||
tighter control over certain resources under testing environments.
|
||
|
||
.. versionchanged:: 0.9
|
||
Added the `exc` argument. Previously this was always using the
|
||
current exception information.
|
||
"""
|
||
if exc is _sentinel:
|
||
exc = sys.exc_info()[1]
|
||
funcs = reversed(self.teardown_request_funcs.get(None, ()))
|
||
bp = _request_ctx_stack.top.request.blueprint
|
||
if bp is not None and bp in self.teardown_request_funcs:
|
||
funcs = chain(funcs, reversed(self.teardown_request_funcs[bp]))
|
||
for func in funcs:
|
||
func(exc)
|
||
request_tearing_down.send(self, exc=exc)
|
||
|
||
def do_teardown_appcontext(self, exc=_sentinel):
|
||
"""Called when an application context is popped. This works pretty
|
||
much the same as :meth:`do_teardown_request` but for the application
|
||
context.
|
||
|
||
.. versionadded:: 0.9
|
||
"""
|
||
if exc is _sentinel:
|
||
exc = sys.exc_info()[1]
|
||
for func in reversed(self.teardown_appcontext_funcs):
|
||
func(exc)
|
||
appcontext_tearing_down.send(self, exc=exc)
|
||
|
||
def app_context(self):
|
||
"""Binds the application only. For as long as the application is bound
|
||
to the current context the :data:`flask.current_app` points to that
|
||
application. An application context is automatically created when a
|
||
request context is pushed if necessary.
|
||
|
||
Example usage::
|
||
|
||
with app.app_context():
|
||
...
|
||
|
||
.. versionadded:: 0.9
|
||
"""
|
||
return AppContext(self)
|
||
|
||
def request_context(self, environ):
|
||
"""Creates a :class:`~flask.ctx.RequestContext` from the given
|
||
environment and binds it to the current context. This must be used in
|
||
combination with the ``with`` statement because the request is only bound
|
||
to the current context for the duration of the ``with`` block.
|
||
|
||
Example usage::
|
||
|
||
with app.request_context(environ):
|
||
do_something_with(request)
|
||
|
||
The object returned can also be used without the ``with`` statement
|
||
which is useful for working in the shell. The example above is
|
||
doing exactly the same as this code::
|
||
|
||
ctx = app.request_context(environ)
|
||
ctx.push()
|
||
try:
|
||
do_something_with(request)
|
||
finally:
|
||
ctx.pop()
|
||
|
||
.. versionchanged:: 0.3
|
||
Added support for non-with statement usage and ``with`` statement
|
||
is now passed the ctx object.
|
||
|
||
:param environ: a WSGI environment
|
||
"""
|
||
return RequestContext(self, environ)
|
||
|
||
def test_request_context(self, *args, **kwargs):
|
||
"""Creates a WSGI environment from the given values (see
|
||
:class:`werkzeug.test.EnvironBuilder` for more information, this
|
||
function accepts the same arguments).
|
||
"""
|
||
from flask.testing import make_test_environ_builder
|
||
builder = make_test_environ_builder(self, *args, **kwargs)
|
||
try:
|
||
return self.request_context(builder.get_environ())
|
||
finally:
|
||
builder.close()
|
||
|
||
def wsgi_app(self, environ, start_response):
|
||
"""The actual WSGI application. This is not implemented in
|
||
`__call__` so that middlewares can be applied without losing a
|
||
reference to the class. So instead of doing this::
|
||
|
||
app = MyMiddleware(app)
|
||
|
||
It's a better idea to do this instead::
|
||
|
||
app.wsgi_app = MyMiddleware(app.wsgi_app)
|
||
|
||
Then you still have the original application object around and
|
||
can continue to call methods on it.
|
||
|
||
.. versionchanged:: 0.7
|
||
The behavior of the before and after request callbacks was changed
|
||
under error conditions and a new callback was added that will
|
||
always execute at the end of the request, independent on if an
|
||
error occurred or not. See :ref:`callbacks-and-errors`.
|
||
|
||
:param environ: a WSGI environment
|
||
:param start_response: a callable accepting a status code,
|
||
a list of headers and an optional
|
||
exception context to start the response
|
||
"""
|
||
ctx = self.request_context(environ)
|
||
ctx.push()
|
||
error = None
|
||
try:
|
||
try:
|
||
response = self.full_dispatch_request()
|
||
except Exception as e:
|
||
error = e
|
||
response = self.make_response(self.handle_exception(e))
|
||
return response(environ, start_response)
|
||
finally:
|
||
if self.should_ignore_error(error):
|
||
error = None
|
||
ctx.auto_pop(error)
|
||
|
||
def __call__(self, environ, start_response):
|
||
"""Shortcut for :attr:`wsgi_app`."""
|
||
return self.wsgi_app(environ, start_response)
|
||
|
||
def __repr__(self):
|
||
return '<%s %r>' % (
|
||
self.__class__.__name__,
|
||
self.name,
|
||
)
|