scrapy · Gallaecio · Jun 26, 2024 · Jun 23, 2024
diff --git a/scrapy/commands/parse.py b/scrapy/commands/parse.py
@@ -153,7 +153,7 @@
     @overload
     def iterate_spider_output(self, result: _T) -> Iterable[Any]: ...
 
-    def iterate_spider_output(self, result: Any) -> Union[Iterable[Any], Deferred]:
+    def iterate_spider_output(self, result: Any) -> Union[Iterable[Any], Deferred[Any]]:
         if inspect.isasyncgen(result):
             d = deferred_from_coro(
                 collect_asyncgen(aiter_errback(result, self.handle_exception))
@@ -233,7 +233,7 @@
         response: Response,
         callback: Callable,
         cb_kwargs: Optional[Dict[str, Any]] = None,
-    ) -> Deferred:
+    ) -> Deferred[Any]:
         cb_kwargs = cb_kwargs or {}
         d = maybeDeferred(self.iterate_spider_output, callback(response, **cb_kwargs))
         return d
@@ -345,7 +345,7 @@
     def prepare_request(
         self, spider: Spider, request: Request, opts: argparse.Namespace
     ) -> Request:
-        def callback(response: Response, **cb_kwargs: Any) -> Deferred:
+        def callback(response: Response, **cb_kwargs: Any) -> Deferred[List[Any]]:
             # memorize first request
             if not self.first_response:
                 self.first_response = response

diff --git a/scrapy/core/downloader/handlers/http10.py b/scrapy/core/downloader/handlers/http10.py
@@ -10,6 +10,7 @@
 
 if TYPE_CHECKING:
     from twisted.internet.defer import Deferred
+    from twisted.internet.interfaces import IConnector
 
     # typing.Self requires Python 3.11
     from typing_extensions import Self
@@ -45,7 +46,7 @@ def download_request(self, request: Request, spider: Spider) -> Deferred[Respons
         self._connect(factory)
         return factory.deferred
 
-    def _connect(self, factory: ScrapyHTTPClientFactory) -> Deferred:
+    def _connect(self, factory: ScrapyHTTPClientFactory) -> IConnector:
         from twisted.internet import reactor
 
         host, port = to_unicode(factory.host), factory.port

diff --git a/scrapy/core/http2/agent.py b/scrapy/core/http2/agent.py
@@ -21,7 +21,7 @@
     from twisted.internet.base import ReactorBase
     from twisted.internet.endpoints import HostnameEndpoint
 
-    from scrapy.http.request import Request
+    from scrapy.http import Request, Response
     from scrapy.settings import Settings
     from scrapy.spiders import Spider
 
@@ -39,16 +39,18 @@
         self._connections: Dict[ConnectionKeyT, H2ClientProtocol] = {}
 
         # Save all requests that arrive before the connection is established
-        self._pending_requests: Dict[ConnectionKeyT, Deque[Deferred]] = {}
+        self._pending_requests: Dict[
+            ConnectionKeyT, Deque[Deferred[H2ClientProtocol]]
+        ] = {}
 
     def get_connection(
         self, key: ConnectionKeyT, uri: URI, endpoint: HostnameEndpoint
-    ) -> Deferred:
+    ) -> Deferred[H2ClientProtocol]:
         if key in self._pending_requests:
             # Received a request while connecting to remote
             # Create a deferred which will fire with the H2ClientProtocol
             # instance
-            d: Deferred = Deferred()
+            d: Deferred[H2ClientProtocol] = Deferred()
             self._pending_requests[key].append(d)
             return d
 
@@ -63,17 +65,17 @@
 
     def _new_connection(
         self, key: ConnectionKeyT, uri: URI, endpoint: HostnameEndpoint
-    ) -> Deferred:
+    ) -> Deferred[H2ClientProtocol]:
         self._pending_requests[key] = deque()
 
-        conn_lost_deferred: Deferred = Deferred()
+        conn_lost_deferred: Deferred[List[BaseException]] = Deferred()
         conn_lost_deferred.addCallback(self._remove_connection, key)
 
         factory = H2ClientFactory(uri, self.settings, conn_lost_deferred)
         conn_d = endpoint.connect(factory)
         conn_d.addCallback(self.put_connection, key)
 
-        d: Deferred = Deferred()
+        d: Deferred[H2ClientProtocol] = Deferred()
         self._pending_requests[key].append(d)
         return d
 
@@ -141,17 +143,19 @@
         """
         return uri.scheme, uri.host, uri.port
 
-    def request(self, request: Request, spider: Spider) -> Deferred:
+    def request(self, request: Request, spider: Spider) -> Deferred[Response]:
         uri = URI.fromBytes(bytes(request.url, encoding="utf-8"))
         try:
             endpoint = self.get_endpoint(uri)
         except SchemeNotSupported:
             return defer.fail(Failure())
 
         key = self.get_key(uri)
-        d = self._pool.get_connection(key, uri, endpoint)
-        d.addCallback(lambda conn: conn.request(request, spider))
-        return d
+        d: Deferred[H2ClientProtocol] = self._pool.get_connection(key, uri, endpoint)
+        d2: Deferred[Response] = d.addCallback(
+            lambda conn: conn.request(request, spider)
+        )
+        return d2
 
 
 class ScrapyProxyH2Agent(H2Agent):

diff --git a/scrapy/core/http2/protocol.py b/scrapy/core/http2/protocol.py
@@ -33,7 +33,7 @@
 from zope.interface import implementer
 
 from scrapy.core.http2.stream import Stream, StreamCloseReason
-from scrapy.http import Request
+from scrapy.http import Request, Response
 
 if TYPE_CHECKING:
     from ipaddress import IPv4Address, IPv6Address
@@ -88,7 +88,10 @@
     IDLE_TIMEOUT = 240
 
     def __init__(
-        self, uri: URI, settings: Settings, conn_lost_deferred: Deferred
+        self,
+        uri: URI,
+        settings: Settings,
+        conn_lost_deferred: Deferred[List[BaseException]],
     ) -> None:
         """
         Arguments:
@@ -99,7 +102,7 @@
             conn_lost_deferred -- Deferred fires with the reason: Failure to notify
                 that connection was lost
         """
-        self._conn_lost_deferred = conn_lost_deferred
+        self._conn_lost_deferred: Deferred[List[BaseException]] = conn_lost_deferred
 
         config = H2Configuration(client_side=True, header_encoding="utf-8")
         self.conn = H2Connection(config=config)
@@ -215,14 +218,14 @@
         data = self.conn.data_to_send()
         self.transport.write(data)
 
-    def request(self, request: Request, spider: Spider) -> Deferred:
+    def request(self, request: Request, spider: Spider) -> Deferred[Response]:
         if not isinstance(request, Request):
             raise TypeError(
                 f"Expected scrapy.http.Request, received {request.__class__.__qualname__}"
             )
 
         stream = self._new_stream(request, spider)
-        d = stream.get_response()
+        d: Deferred[Response] = stream.get_response()
 
         # Add the stream to the request pool
         self._pending_request_stream_pool.append(stream)
@@ -436,7 +439,10 @@
 @implementer(IProtocolNegotiationFactory)
 class H2ClientFactory(Factory):
     def __init__(
-        self, uri: URI, settings: Settings, conn_lost_deferred: Deferred
+        self,
+        uri: URI,
+        settings: Settings,
+        conn_lost_deferred: Deferred[List[BaseException]],
     ) -> None:
         self.uri = uri
         self.settings = settings

diff --git a/scrapy/core/http2/stream.py b/scrapy/core/http2/stream.py
@@ -20,7 +20,7 @@
     from hpack import HeaderTuple
 
     from scrapy.core.http2.protocol import H2ClientProtocol
-    from scrapy.http import Request
+    from scrapy.http import Request, Response
 
 
 logger = logging.getLogger(__name__)
@@ -154,7 +154,7 @@
             else:
                 self.close(StreamCloseReason.CANCELLED)
 
-        self._deferred_response: Deferred = Deferred(_cancel)
+        self._deferred_response: Deferred[Response] = Deferred(_cancel)
 
     def __repr__(self) -> str:
         return f"Stream(id={self.stream_id!r})"
@@ -180,7 +180,7 @@
             and not self.metadata["reached_warnsize"]
         )
 
-    def get_response(self) -> Deferred:
+    def get_response(self) -> Deferred[Response]:
         """Simply return a Deferred which fires when response
         from the asynchronous request is available
         """

diff --git a/scrapy/core/scraper.py b/scrapy/core/scraper.py
@@ -13,6 +13,7 @@
     Generator,
     Iterable,
     Iterator,
+    List,
     Optional,
     Set,
     Tuple,
@@ -34,7 +35,6 @@
 from scrapy.pipelines import ItemPipelineManager
 from scrapy.signalmanager import SignalManager
 from scrapy.utils.defer import (
-    DeferredListResultListT,
     aiter_errback,
     defer_fail,
     defer_succeed,
@@ -54,7 +54,7 @@
 
 
 _T = TypeVar("_T")
-_ParallelResult = DeferredListResultListT[Iterator[Any]]
+_ParallelResult = List[Tuple[bool, Iterator[Any]]]
 
 if TYPE_CHECKING:
     # parameterized Deferreds require Twisted 21.7.0
@@ -374,7 +374,7 @@ def _log_download_errors(
 
     def _itemproc_finished(
         self, output: Any, item: Any, response: Response, spider: Spider
-    ) -> Deferred:
+    ) -> Deferred[Any]:
         """ItemProcessor finished for the given ``item`` and returned ``output``"""
         assert self.slot is not None  # typing
         self.slot.itemproc_size -= 1

diff --git a/scrapy/core/spidermw.py b/scrapy/core/spidermw.py
@@ -302,7 +302,10 @@ async def _process_callback_output(
             recovered = MutableChain()
         result = self._evaluate_iterable(response, spider, result, 0, recovered)
         result = await maybe_deferred_to_future(
-            self._process_spider_output(response, spider, result)
+            cast(
+                "Deferred[Union[Iterable[_T], AsyncIterable[_T]]]",
+                self._process_spider_output(response, spider, result),
+            )
         )
         if isinstance(result, AsyncIterable):
             return MutableAsyncChain(result, recovered)
@@ -339,7 +342,7 @@ def process_spider_exception(
 
     def process_start_requests(
         self, start_requests: Iterable[Request], spider: Spider
-    ) -> Deferred:
+    ) -> Deferred[Iterable[Request]]:
         return self._process_chain("process_start_requests", start_requests, spider)
 
     # This method is only needed until _async compatibility methods are removed.

diff --git a/scrapy/crawler.py b/scrapy/crawler.py
@@ -4,7 +4,18 @@
 import pprint
 import signal
 import warnings
-from typing import TYPE_CHECKING, Any, Dict, Generator, Optional, Set, Type, Union, cast
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Dict,
+    Generator,
+    Optional,
+    Set,
+    Type,
+    TypeVar,
+    Union,
+    cast,
+)
 
 from twisted.internet.defer import (
     Deferred,
@@ -54,6 +65,8 @@
 
 logger = logging.getLogger(__name__)
 
+_T = TypeVar("_T")
+
 
 class Crawler:
     def __init__(
@@ -140,7 +153,7 @@ def _apply_settings(self) -> None:
         )
 
     @inlineCallbacks
-    def crawl(self, *args: Any, **kwargs: Any) -> Generator[Deferred, Any, None]:
+    def crawl(self, *args: Any, **kwargs: Any) -> Generator[Deferred[Any], Any, None]:
         if self.crawling:
             raise RuntimeError("Crawling already taking place")
         if self._started:
@@ -172,7 +185,7 @@ def _create_engine(self) -> ExecutionEngine:
         return ExecutionEngine(self, lambda _: self.stop())
 
     @inlineCallbacks
-    def stop(self) -> Generator[Deferred, Any, None]:
+    def stop(self) -> Generator[Deferred[Any], Any, None]:
         """Starts a graceful stop of the crawler and returns a deferred that is
         fired when the crawler is stopped."""
         if self.crawling:
@@ -256,15 +269,15 @@ def __init__(self, settings: Union[Dict[str, Any], Settings, None] = None):
         self.settings = settings
         self.spider_loader = self._get_spider_loader(settings)
         self._crawlers: Set[Crawler] = set()
-        self._active: Set[Deferred] = set()
+        self._active: Set[Deferred[None]] = set()
         self.bootstrap_failed = False
 
     def crawl(
         self,
         crawler_or_spidercls: Union[Type[Spider], str, Crawler],
         *args: Any,
         **kwargs: Any,
-    ) -> Deferred:
+    ) -> Deferred[None]:
         """
         Run a crawler with the provided arguments.
 
@@ -294,12 +307,12 @@ def crawl(
         crawler = self.create_crawler(crawler_or_spidercls)
         return self._crawl(crawler, *args, **kwargs)
 
-    def _crawl(self, crawler: Crawler, *args: Any, **kwargs: Any) -> Deferred:
+    def _crawl(self, crawler: Crawler, *args: Any, **kwargs: Any) -> Deferred[None]:
         self.crawlers.add(crawler)
         d = crawler.crawl(*args, **kwargs)
         self._active.add(d)
 
-        def _done(result: Any) -> Any:
+        def _done(result: _T) -> _T:
             self.crawlers.discard(crawler)
             self._active.discard(d)
             self.bootstrap_failed |= not getattr(crawler, "spider", None)
@@ -335,7 +348,7 @@ def _create_crawler(self, spidercls: Union[str, Type[Spider]]) -> Crawler:
         # temporary cast until self.spider_loader is typed
         return Crawler(cast(Type[Spider], spidercls), self.settings)
 
-    def stop(self) -> Deferred:
+    def stop(self) -> Deferred[Any]:
         """
         Stops simultaneously all the crawling jobs taking place.
 
@@ -344,7 +357,7 @@ def stop(self) -> Deferred:
         return DeferredList([c.stop() for c in list(self.crawlers)])
 
     @inlineCallbacks
-    def join(self) -> Generator[Deferred, Any, None]:
+    def join(self) -> Generator[Deferred[Any], Any, None]:
         """
         join()
 
@@ -460,7 +473,7 @@ def start(
             )
         reactor.run(installSignalHandlers=install_signal_handlers)  # blocking call
 
-    def _graceful_stop_reactor(self) -> Deferred:
+    def _graceful_stop_reactor(self) -> Deferred[Any]:
         d = self.stop()
         d.addBoth(self._stop_reactor)
         return d