Add type stubs for google.protobuf.service (#2187)

third_party/2and3/google/protobuf/service.pyi

@@ -0,0 +1,39 @@
+from concurrent.futures import Future
+from typing import Callable, Optional, Text, Type
+
+from google.protobuf.descriptor import MethodDescriptor, ServiceDescriptor
+from google.protobuf.message import Message
+
+class RpcException(Exception): ...
+
+class Service:
+    @staticmethod
+    def GetDescriptor() -> ServiceDescriptor: ...
+    def CallMethod(
+        self,
+        method_descriptor: MethodDescriptor,
+        rpc_controller: RpcController,
+        request: Message,
+        done: Optional[Callable[[Message], None]],
+    ) -> Optional[Future[Message]]: ...
+    def GetRequestClass(self, method_descriptor: MethodDescriptor) -> Type[Message]: ...
+    def GetResponseClass(self, method_descriptor: MethodDescriptor) -> Type[Message]: ...
+
+class RpcController:
+    def Reset(self) -> None: ...
+    def Failed(self) -> bool: ...
+    def ErrorText(self) -> Optional[Text]: ...
+    def StartCancel(self) -> None: ...
+    def SetFailed(self, reason: Text) -> None: ...
+    def IsCanceled(self) -> bool: ...
+    def NotifyOnCancel(self, callback: Callable[[], None]) -> None: ...
+
+class RpcChannel:
+    def CallMethod(
+        self,
+        method_descriptor: MethodDescriptor,
+        rpc_controller: RpcController,
+        request: Message,
+        response_class: Type[Message],
+        done: Optional[Callable[[Message], None]],
+    ) -> Optional[Future[Message]]: ...