use a TypeVar for asyncio.BaseProtocol (#478)

* Revert "_TransProtPair is no longer defined in asyncio.events"

This reverts commit fae5f7fb78.

* fix mypy

uvloop/loop.pyi

@@ -21,7 +21,7 @@ _T = TypeVar('_T')
 _Context = Dict[str, Any]
 _ExceptionHandler = Callable[[asyncio.AbstractEventLoop, _Context], Any]
 _SSLContext = Union[bool, None, ssl.SSLContext]
-_TransProtPair = Tuple[asyncio.transports.BaseTransport, asyncio.protocols.BaseProtocol]
+_ProtocolT = TypeVar("_ProtocolT", bound=asyncio.BaseProtocol)
 
 class Loop:
     def call_soon(
@@ -143,7 +143,7 @@ class Loop:
     @overload
     async def create_connection(
         self,
-        protocol_factory: asyncio.events._ProtocolFactory,
+        protocol_factory: Callable[[], _ProtocolT],
         host: str = ...,
         port: int = ...,
         *,
@@ -156,11 +156,11 @@ class Loop:
         server_hostname: Optional[str] = ...,
         ssl_handshake_timeout: Optional[float] = ...,
         ssl_shutdown_timeout: Optional[float] = ...,
-    ) -> _TransProtPair: ...
+    ) -> tuple[asyncio.BaseProtocol, _ProtocolT]: ...
     @overload
     async def create_connection(
         self,
-        protocol_factory: asyncio.events._ProtocolFactory,
+        protocol_factory: Callable[[], _ProtocolT],
         host: None = ...,
         port: None = ...,
         *,
@@ -173,7 +173,7 @@ class Loop:
         server_hostname: Optional[str] = ...,
         ssl_handshake_timeout: Optional[float] = ...,
         ssl_shutdown_timeout: Optional[float] = ...,
-    ) -> _TransProtPair: ...
+    ) -> tuple[asyncio.BaseProtocol, _ProtocolT]: ...
     async def create_unix_server(
         self,
         protocol_factory: asyncio.events._ProtocolFactory,
@@ -188,7 +188,7 @@ class Loop:
     ) -> asyncio.AbstractServer: ...
     async def create_unix_connection(
         self,
-        protocol_factory: asyncio.events._ProtocolFactory,
+        protocol_factory: Callable[[], _ProtocolT],
         path: Optional[str] = ...,
         *,
         ssl: _SSLContext = ...,
@@ -196,7 +196,7 @@ class Loop:
         server_hostname: Optional[str] = ...,
         ssl_handshake_timeout: Optional[float] = ...,
         ssl_shutdown_timeout: Optional[float] = ...,
-    ) -> _TransProtPair: ...
+    ) -> tuple[asyncio.BaseProtocol, _ProtocolT]: ...
     def default_exception_handler(self, context: _Context) -> None: ...
     def get_exception_handler(self) -> Optional[_ExceptionHandler]: ...
     def set_exception_handler(self, handler: Optional[_ExceptionHandler]) -> None: ...
@@ -212,49 +212,49 @@ class Loop:
     async def sock_connect(self, sock: socket, address: _Address) -> None: ...
     async def connect_accepted_socket(
         self,
-        protocol_factory: asyncio.events._ProtocolFactory,
+        protocol_factory: Callable[[], _ProtocolT],
         sock: socket,
         *,
         ssl: _SSLContext = ...,
         ssl_handshake_timeout: Optional[float] = ...,
         ssl_shutdown_timeout: Optional[float] = ...,
-    ) -> _TransProtPair: ...
+    ) -> tuple[asyncio.BaseProtocol, _ProtocolT]: ...
     async def run_in_executor(
         self, executor: Any, func: Callable[..., _T], *args: Any
     ) -> _T: ...
     def set_default_executor(self, executor: Any) -> None: ...
     async def subprocess_shell(
         self,
-        protocol_factory: asyncio.events._ProtocolFactory,
+        protocol_factory: Callable[[], _ProtocolT],
         cmd: Union[bytes, str],
         *,
         stdin: Any = ...,
         stdout: Any = ...,
         stderr: Any = ...,
         **kwargs: Any,
-    ) -> _TransProtPair: ...
+    ) -> tuple[asyncio.BaseProtocol, _ProtocolT]: ...
     async def subprocess_exec(
         self,
-        protocol_factory: asyncio.events._ProtocolFactory,
+        protocol_factory: Callable[[], _ProtocolT],
         *args: Any,
         stdin: Any = ...,
         stdout: Any = ...,
         stderr: Any = ...,
         **kwargs: Any,
-    ) -> _TransProtPair: ...
+    ) -> tuple[asyncio.BaseProtocol, _ProtocolT]: ...
     async def connect_read_pipe(
-        self, protocol_factory: asyncio.events._ProtocolFactory, pipe: Any
-    ) -> _TransProtPair: ...
+        self, protocol_factory: Callable[[], _ProtocolT], pipe: Any
+    ) -> tuple[asyncio.BaseProtocol, _ProtocolT]: ...
     async def connect_write_pipe(
-        self, protocol_factory: asyncio.events._ProtocolFactory, pipe: Any
-    ) -> _TransProtPair: ...
+        self, protocol_factory: Callable[[], _ProtocolT], pipe: Any
+    ) -> tuple[asyncio.BaseProtocol, _ProtocolT]: ...
     def add_signal_handler(
         self, sig: int, callback: Callable[..., Any], *args: Any
     ) -> None: ...
     def remove_signal_handler(self, sig: int) -> bool: ...
     async def create_datagram_endpoint(
         self,
-        protocol_factory: asyncio.events._ProtocolFactory,
+        protocol_factory: Callable[[], _ProtocolT],
         local_addr: Optional[Tuple[str, int]] = ...,
         remote_addr: Optional[Tuple[str, int]] = ...,
         *,
@@ -265,7 +265,7 @@ class Loop:
         reuse_port: Optional[bool] = ...,
         allow_broadcast: Optional[bool] = ...,
         sock: Optional[socket] = ...,
-    ) -> _TransProtPair: ...
+    ) -> tuple[asyncio.BaseProtocol, _ProtocolT]: ...
     async def shutdown_asyncgens(self) -> None: ...
     async def shutdown_default_executor(self) -> None: ...
     # Loop doesn't implement these, but since they are marked as abstract in typeshed,