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web_app.py
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web_app.py
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import asyncio
import logging
import warnings
from functools import partial, update_wrapper
from typing import ( # noqa
TYPE_CHECKING,
Any,
AsyncIterator,
Awaitable,
Callable,
Dict,
Iterable,
Iterator,
List,
Mapping,
MutableMapping,
Optional,
Sequence,
Tuple,
Type,
Union,
cast,
)
from aiosignal import Signal
from frozenlist import FrozenList
from typing_extensions import final
from . import hdrs
from .log import web_logger
from .typedefs import Middleware
from .web_middlewares import _fix_request_current_app
from .web_request import Request
from .web_response import StreamResponse
from .web_routedef import AbstractRouteDef
from .web_urldispatcher import (
AbstractResource,
AbstractRoute,
Domain,
MaskDomain,
MatchedSubAppResource,
PrefixedSubAppResource,
UrlDispatcher,
)
__all__ = ("Application", "CleanupError")
if TYPE_CHECKING: # pragma: no cover
_AppSignal = Signal[Callable[["Application"], Awaitable[None]]]
_RespPrepareSignal = Signal[Callable[[Request, StreamResponse], Awaitable[None]]]
_Middlewares = FrozenList[Middleware]
_MiddlewaresHandlers = Sequence[Middleware]
_Subapps = List["Application"]
else:
# No type checker mode, skip types
_AppSignal = Signal
_RespPrepareSignal = Signal
_Handler = Callable
_Middlewares = FrozenList
_MiddlewaresHandlers = Sequence
_Subapps = List
@final
class Application(MutableMapping[str, Any]):
__slots__ = (
"logger",
"_debug",
"_router",
"_loop",
"_handler_args",
"_middlewares",
"_middlewares_handlers",
"_run_middlewares",
"_state",
"_frozen",
"_pre_frozen",
"_subapps",
"_on_response_prepare",
"_on_startup",
"_on_shutdown",
"_on_cleanup",
"_client_max_size",
"_cleanup_ctx",
)
def __init__(
self,
*,
logger: logging.Logger = web_logger,
middlewares: Iterable[Middleware] = (),
handler_args: Optional[Mapping[str, Any]] = None,
client_max_size: int = 1024 ** 2,
debug: Any = ..., # mypy doesn't support ellipsis
) -> None:
if debug is not ...:
warnings.warn(
"debug argument is no-op since 4.0 " "and scheduled for removal in 5.0",
DeprecationWarning,
stacklevel=2,
)
self._router = UrlDispatcher()
self._handler_args = handler_args
self.logger = logger
self._middlewares = FrozenList(middlewares) # type: _Middlewares
# initialized on freezing
self._middlewares_handlers = tuple() # type: _MiddlewaresHandlers
# initialized on freezing
self._run_middlewares = None # type: Optional[bool]
self._state = {} # type: Dict[str, Any]
self._frozen = False
self._pre_frozen = False
self._subapps = [] # type: _Subapps
self._on_response_prepare = Signal(self) # type: _RespPrepareSignal
self._on_startup = Signal(self) # type: _AppSignal
self._on_shutdown = Signal(self) # type: _AppSignal
self._on_cleanup = Signal(self) # type: _AppSignal
self._cleanup_ctx = CleanupContext()
self._on_startup.append(self._cleanup_ctx._on_startup)
self._on_cleanup.append(self._cleanup_ctx._on_cleanup)
self._client_max_size = client_max_size
def __init_subclass__(cls: Type["Application"]) -> None:
raise TypeError(
"Inheritance class {} from web.Application "
"is forbidden".format(cls.__name__)
)
# MutableMapping API
def __eq__(self, other: object) -> bool:
return self is other
def __getitem__(self, key: str) -> Any:
return self._state[key]
def _check_frozen(self) -> None:
if self._frozen:
raise RuntimeError(
"Changing state of started or joined " "application is forbidden"
)
def __setitem__(self, key: str, value: Any) -> None:
self._check_frozen()
self._state[key] = value
def __delitem__(self, key: str) -> None:
self._check_frozen()
del self._state[key]
def __len__(self) -> int:
return len(self._state)
def __iter__(self) -> Iterator[str]:
return iter(self._state)
########
def _set_loop(self, loop: Optional[asyncio.AbstractEventLoop]) -> None:
warnings.warn(
"_set_loop() is no-op since 4.0 " "and scheduled for removal in 5.0",
DeprecationWarning,
stacklevel=2,
)
@property
def pre_frozen(self) -> bool:
return self._pre_frozen
def pre_freeze(self) -> None:
if self._pre_frozen:
return
self._pre_frozen = True
self._middlewares.freeze()
self._router.freeze()
self._on_response_prepare.freeze()
self._cleanup_ctx.freeze()
self._on_startup.freeze()
self._on_shutdown.freeze()
self._on_cleanup.freeze()
self._middlewares_handlers = tuple(self._prepare_middleware())
# If current app and any subapp do not have middlewares avoid run all
# of the code footprint that it implies, which have a middleware
# hardcoded per app that sets up the current_app attribute. If no
# middlewares are configured the handler will receive the proper
# current_app without needing all of this code.
self._run_middlewares = True if self.middlewares else False
for subapp in self._subapps:
subapp.pre_freeze()
self._run_middlewares = self._run_middlewares or subapp._run_middlewares
@property
def frozen(self) -> bool:
return self._frozen
def freeze(self) -> None:
if self._frozen:
return
self.pre_freeze()
self._frozen = True
for subapp in self._subapps:
subapp.freeze()
@property
def debug(self) -> bool:
warnings.warn(
"debug property is deprecated since 4.0" "and scheduled for removal in 5.0",
DeprecationWarning,
stacklevel=2,
)
return asyncio.get_event_loop().get_debug()
def _reg_subapp_signals(self, subapp: "Application") -> None:
def reg_handler(signame: str) -> None:
subsig = getattr(subapp, signame)
async def handler(app: "Application") -> None:
await subsig.send(subapp)
appsig = getattr(self, signame)
appsig.append(handler)
reg_handler("on_startup")
reg_handler("on_shutdown")
reg_handler("on_cleanup")
def add_subapp(self, prefix: str, subapp: "Application") -> AbstractResource:
if not isinstance(prefix, str):
raise TypeError("Prefix must be str")
prefix = prefix.rstrip("/")
if not prefix:
raise ValueError("Prefix cannot be empty")
factory = partial(PrefixedSubAppResource, prefix, subapp)
return self._add_subapp(factory, subapp)
def _add_subapp(
self, resource_factory: Callable[[], AbstractResource], subapp: "Application"
) -> AbstractResource:
if self.frozen:
raise RuntimeError("Cannot add sub application to frozen application")
if subapp.frozen:
raise RuntimeError("Cannot add frozen application")
resource = resource_factory()
self.router.register_resource(resource)
self._reg_subapp_signals(subapp)
self._subapps.append(subapp)
subapp.pre_freeze()
return resource
def add_domain(self, domain: str, subapp: "Application") -> AbstractResource:
if not isinstance(domain, str):
raise TypeError("Domain must be str")
elif "*" in domain:
rule = MaskDomain(domain) # type: Domain
else:
rule = Domain(domain)
factory = partial(MatchedSubAppResource, rule, subapp)
return self._add_subapp(factory, subapp)
def add_routes(self, routes: Iterable[AbstractRouteDef]) -> List[AbstractRoute]:
return self.router.add_routes(routes)
@property
def on_response_prepare(self) -> _RespPrepareSignal:
return self._on_response_prepare
@property
def on_startup(self) -> _AppSignal:
return self._on_startup
@property
def on_shutdown(self) -> _AppSignal:
return self._on_shutdown
@property
def on_cleanup(self) -> _AppSignal:
return self._on_cleanup
@property
def cleanup_ctx(self) -> "CleanupContext":
return self._cleanup_ctx
@property
def router(self) -> UrlDispatcher:
return self._router
@property
def middlewares(self) -> _Middlewares:
return self._middlewares
async def startup(self) -> None:
"""Causes on_startup signal
Should be called in the event loop along with the request handler.
"""
await self.on_startup.send(self)
async def shutdown(self) -> None:
"""Causes on_shutdown signal
Should be called before cleanup()
"""
await self.on_shutdown.send(self)
async def cleanup(self) -> None:
"""Causes on_cleanup signal
Should be called after shutdown()
"""
if self.on_cleanup.frozen:
await self.on_cleanup.send(self)
else:
# If an exception occurs in startup, ensure cleanup contexts are completed.
await self._cleanup_ctx._on_cleanup(self)
def _prepare_middleware(self) -> Iterator[Middleware]:
yield from reversed(self._middlewares)
yield _fix_request_current_app(self)
async def _handle(self, request: Request) -> StreamResponse:
match_info = await self._router.resolve(request)
match_info.add_app(self)
match_info.freeze()
resp = None
request._match_info = match_info # type: ignore[assignment]
expect = request.headers.get(hdrs.EXPECT)
if expect:
resp = await match_info.expect_handler(request)
await request.writer.drain()
if resp is None:
handler = match_info.handler
if self._run_middlewares:
for app in match_info.apps[::-1]:
assert app.pre_frozen, "middleware handlers are not ready"
for m in app._middlewares_handlers:
handler = update_wrapper(partial(m, handler=handler), handler)
resp = await handler(request)
return resp
def __call__(self) -> "Application":
"""gunicorn compatibility"""
return self
def __repr__(self) -> str:
return "<Application 0x{:x}>".format(id(self))
def __bool__(self) -> bool:
return True
class CleanupError(RuntimeError):
@property
def exceptions(self) -> List[BaseException]:
return cast(List[BaseException], self.args[1])
if TYPE_CHECKING: # pragma: no cover
_CleanupContextBase = FrozenList[Callable[[Application], AsyncIterator[None]]]
else:
_CleanupContextBase = FrozenList
class CleanupContext(_CleanupContextBase):
def __init__(self) -> None:
super().__init__()
self._exits = [] # type: List[AsyncIterator[None]]
async def _on_startup(self, app: Application) -> None:
for cb in self:
it = cb(app).__aiter__()
await it.__anext__()
self._exits.append(it)
async def _on_cleanup(self, app: Application) -> None:
errors = []
for it in reversed(self._exits):
try:
await it.__anext__()
except StopAsyncIteration:
pass
except Exception as exc:
errors.append(exc)
else:
errors.append(RuntimeError(f"{it!r} has more than one 'yield'"))
if errors:
if len(errors) == 1:
raise errors[0]
else:
raise CleanupError("Multiple errors on cleanup stage", errors)