import asyncio
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import warnings
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from collections import MutableMapping
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from functools import partial
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from typing import TYPE_CHECKING, Awaitable, Callable
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from . import hdrs
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from .abc import AbstractAccessLogger, AbstractMatchInfo, AbstractRouter
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from .frozenlist import FrozenList
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from .helpers import DEBUG, AccessLogger
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from .log import web_logger
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from .signals import Signal
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from .web_middlewares import _fix_request_current_app
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from .web_request import Request
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from .web_response import StreamResponse
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from .web_server import Server
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from .web_urldispatcher import PrefixedSubAppResource, UrlDispatcher
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__all__ = ('Application', 'CleanupError')
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if TYPE_CHECKING: # pragma: no branch
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_AppSignal = Signal[Callable[['Application'], Awaitable[None]]]
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_RespPrepareSignal = Signal[Callable[[Request, StreamResponse],
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Awaitable[None]]]
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else:
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# No type checker mode, skip types
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_AppSignal = Signal
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_RespPrepareSignal = Signal
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class Application(MutableMapping):
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ATTRS = frozenset([
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'logger', '_debug', '_router', '_loop', '_handler_args',
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'_middlewares', '_middlewares_handlers', '_run_middlewares',
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'_state', '_frozen', '_pre_frozen', '_subapps',
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'_on_response_prepare', '_on_startup', '_on_shutdown',
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'_on_cleanup', '_client_max_size', '_cleanup_ctx'])
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def __init__(self, *,
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logger=web_logger,
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router=None,
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middlewares=(),
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handler_args=None,
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client_max_size=1024**2,
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loop=None,
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debug=...):
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if router is None:
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router = UrlDispatcher()
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else:
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warnings.warn("router argument is deprecated", DeprecationWarning,
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stacklevel=2)
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assert isinstance(router, AbstractRouter), router
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if loop is not None:
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warnings.warn("loop argument is deprecated", DeprecationWarning,
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stacklevel=2)
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self._debug = debug
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self._router = router # type: UrlDispatcher
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self._loop = loop
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self._handler_args = handler_args
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self.logger = logger
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self._middlewares = FrozenList(middlewares)
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self._middlewares_handlers = None # initialized on freezing
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self._run_middlewares = None # initialized on freezing
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self._state = {}
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self._frozen = False
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self._pre_frozen = False
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self._subapps = []
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self._on_response_prepare = Signal(self) # type: _RespPrepareSignal
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self._on_startup = Signal(self) # type: _AppSignal
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self._on_shutdown = Signal(self) # type: _AppSignal
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self._on_cleanup = Signal(self) # type: _AppSignal
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self._cleanup_ctx = CleanupContext()
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self._on_startup.append(self._cleanup_ctx._on_startup)
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self._on_cleanup.append(self._cleanup_ctx._on_cleanup)
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self._client_max_size = client_max_size
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def __init_subclass__(cls):
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warnings.warn("Inheritance class {} from web.Application "
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"is discouraged".format(cls.__name__),
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DeprecationWarning,
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stacklevel=2)
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if DEBUG:
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def __setattr__(self, name, val):
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if name not in self.ATTRS:
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warnings.warn("Setting custom web.Application.{} attribute "
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"is discouraged".format(name),
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DeprecationWarning,
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stacklevel=2)
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super().__setattr__(name, val)
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# MutableMapping API
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def __eq__(self, other):
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return self is other
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def __getitem__(self, key):
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return self._state[key]
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def _check_frozen(self):
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if self._frozen:
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warnings.warn("Changing state of started or joined "
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"application is deprecated",
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DeprecationWarning,
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stacklevel=3)
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def __setitem__(self, key, value):
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self._check_frozen()
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self._state[key] = value
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def __delitem__(self, key):
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self._check_frozen()
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del self._state[key]
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def __len__(self):
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return len(self._state)
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def __iter__(self):
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return iter(self._state)
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########
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@property
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def loop(self):
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return self._loop
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def _set_loop(self, loop):
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if loop is None:
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loop = asyncio.get_event_loop()
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if self._loop is not None and self._loop is not loop:
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raise RuntimeError(
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"web.Application instance initialized with different loop")
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self._loop = loop
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# set loop debug
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if self._debug is ...:
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self._debug = loop.get_debug()
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# set loop to sub applications
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for subapp in self._subapps:
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subapp._set_loop(loop)
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@property
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def pre_frozen(self) -> bool:
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return self._pre_frozen
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def pre_freeze(self) -> None:
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if self._pre_frozen:
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return
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self._pre_frozen = True
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self._middlewares.freeze()
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self._router.freeze()
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self._on_response_prepare.freeze()
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self._cleanup_ctx.freeze()
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self._on_startup.freeze()
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self._on_shutdown.freeze()
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self._on_cleanup.freeze()
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self._middlewares_handlers = tuple(self._prepare_middleware())
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# If current app and any subapp do not have middlewares avoid run all
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# of the code footprint that it implies, which have a middleware
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# hardcoded per app that sets up the current_app attribute. If no
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# middlewares are configured the handler will receive the proper
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# current_app without needing all of this code.
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self._run_middlewares = True if self.middlewares else False
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for subapp in self._subapps:
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subapp.pre_freeze()
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self._run_middlewares =\
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self._run_middlewares or subapp._run_middlewares
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@property
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def frozen(self) -> bool:
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return self._frozen
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def freeze(self) -> None:
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if self._frozen:
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return
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self.pre_freeze()
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self._frozen = True
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for subapp in self._subapps:
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subapp.freeze()
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@property
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def debug(self) -> bool:
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return self._debug
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def _reg_subapp_signals(self, subapp):
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def reg_handler(signame):
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subsig = getattr(subapp, signame)
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async def handler(app):
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await subsig.send(subapp)
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appsig = getattr(self, signame)
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appsig.append(handler)
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reg_handler('on_startup')
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reg_handler('on_shutdown')
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reg_handler('on_cleanup')
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def add_subapp(self, prefix: str, subapp: 'Application'):
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if self.frozen:
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raise RuntimeError(
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"Cannot add sub application to frozen application")
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if subapp.frozen:
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raise RuntimeError("Cannot add frozen application")
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if prefix.endswith('/'):
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prefix = prefix[:-1]
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if prefix in ('', '/'):
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raise ValueError("Prefix cannot be empty")
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resource = PrefixedSubAppResource(prefix, subapp)
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self.router.register_resource(resource)
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self._reg_subapp_signals(subapp)
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self._subapps.append(subapp)
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subapp.pre_freeze()
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if self._loop is not None:
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subapp._set_loop(self._loop)
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return resource
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def add_routes(self, routes):
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self.router.add_routes(routes)
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@property
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def on_response_prepare(self) -> _RespPrepareSignal:
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return self._on_response_prepare
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@property
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def on_startup(self) -> _AppSignal:
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return self._on_startup
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@property
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def on_shutdown(self) -> _AppSignal:
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return self._on_shutdown
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@property
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def on_cleanup(self) -> _AppSignal:
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return self._on_cleanup
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@property
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def cleanup_ctx(self):
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return self._cleanup_ctx
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@property
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def router(self) -> UrlDispatcher:
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return self._router
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@property
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def middlewares(self):
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return self._middlewares
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def _make_handler(self, *,
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loop=None,
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access_log_class=AccessLogger,
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**kwargs):
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if not issubclass(access_log_class, AbstractAccessLogger):
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raise TypeError(
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'access_log_class must be subclass of '
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'aiohttp.abc.AbstractAccessLogger, got {}'.format(
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access_log_class))
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self._set_loop(loop)
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self.freeze()
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kwargs['debug'] = self.debug
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if self._handler_args:
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for k, v in self._handler_args.items():
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kwargs[k] = v
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return Server(self._handle, request_factory=self._make_request,
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access_log_class=access_log_class,
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loop=self.loop, **kwargs)
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def make_handler(self, *,
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loop=None,
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access_log_class=AccessLogger,
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**kwargs):
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warnings.warn("Application.make_handler(...) is deprecated, "
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"use AppRunner API instead",
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DeprecationWarning,
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stacklevel=2)
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return self._make_handler(loop=loop,
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access_log_class=access_log_class,
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**kwargs)
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async def startup(self) -> None:
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"""Causes on_startup signal
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Should be called in the event loop along with the request handler.
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"""
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await self.on_startup.send(self)
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async def shutdown(self) -> None:
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"""Causes on_shutdown signal
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Should be called before cleanup()
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"""
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await self.on_shutdown.send(self)
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async def cleanup(self) -> None:
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"""Causes on_cleanup signal
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Should be called after shutdown()
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"""
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await self.on_cleanup.send(self)
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def _make_request(self, message, payload, protocol, writer, task,
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_cls=Request):
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return _cls(
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message, payload, protocol, writer, task,
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self._loop,
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client_max_size=self._client_max_size)
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def _prepare_middleware(self):
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for m in reversed(self._middlewares):
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if getattr(m, '__middleware_version__', None) == 1:
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yield m, True
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else:
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warnings.warn('old-style middleware "{!r}" deprecated, '
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'see #2252'.format(m),
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DeprecationWarning, stacklevel=2)
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yield m, False
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yield _fix_request_current_app(self), True
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async def _handle(self, request):
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match_info = await self._router.resolve(request)
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if DEBUG: # pragma: no cover
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if not isinstance(match_info, AbstractMatchInfo):
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raise TypeError("match_info should be AbstractMAtchInfo "
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"instance, not {!r}".format(match_info))
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match_info.add_app(self)
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match_info.freeze()
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resp = None
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request._match_info = match_info
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expect = request.headers.get(hdrs.EXPECT)
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if expect:
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resp = await match_info.expect_handler(request)
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await request.writer.drain()
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if resp is None:
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handler = match_info.handler
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if self._run_middlewares:
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for app in match_info.apps[::-1]:
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for m, new_style in app._middlewares_handlers:
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if new_style:
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handler = partial(m, handler=handler)
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else:
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handler = await m(app, handler)
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resp = await handler(request)
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if DEBUG:
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if not isinstance(resp, StreamResponse):
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msg = ("Handler {!r} should return response instance, "
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"got {!r} [middlewares {!r}]").format(
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match_info.handler, type(resp),
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[middleware
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for app in match_info.apps
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for middleware in app.middlewares])
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raise TypeError(msg)
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return resp
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def __call__(self):
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"""gunicorn compatibility"""
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return self
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def __repr__(self):
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return "<Application 0x{:x}>".format(id(self))
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class CleanupError(RuntimeError):
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@property
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def exceptions(self):
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return self.args[1]
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class CleanupContext(FrozenList):
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def __init__(self):
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super().__init__()
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self._exits = []
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async def _on_startup(self, app):
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for cb in self:
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it = cb(app).__aiter__()
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await it.__anext__()
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self._exits.append(it)
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async def _on_cleanup(self, app):
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errors = []
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for it in reversed(self._exits):
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try:
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await it.__anext__()
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except StopAsyncIteration:
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pass
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except Exception as exc:
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errors.append(exc)
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else:
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errors.append(RuntimeError("{!r} has more than one 'yield'"
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.format(it)))
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if errors:
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if len(errors) == 1:
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raise errors[0]
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else:
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raise CleanupError("Multiple errors on cleanup stage", errors)
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