convert typing-only classes and variables to private

Author: macro1

stubs/grpcio/@tests/stubtest_allowlist.txt

@@ -1,30 +1,3 @@
-# Error: is not present at runtime
-# =============================
-# Classes introduced in the typing library to provide interface structure.
-grpc.Behaviour
-grpc.CallFuture
-grpc.CallIterator
-grpc.CertificateChainPair
-grpc.Interceptor
-grpc.Metadata
-grpc.RequestDeserializer
-grpc.RequestSerializer
-grpc.ResponseDeserializer
-grpc.ResponseSerializer
-grpc.aio.DoneCallback
-grpc.aio.DoneCallbackType
-grpc.aio.EOFType
-grpc.aio.InterceptedCall
-grpc.aio.MetadataKey
-grpc.aio.MetadataType
-grpc.aio.MetadataValue
-grpc.aio.MetadatumType
-grpc.aio.RequestSerializer
-grpc.aio.ResponseDeserializer
-grpc_health.v1.health.SendResponseCallback
-grpc_reflection.v1alpha.reflection.AnyServer
-grpc_reflection.v1alpha.reflection.AnyServicerContext
-
 # Error: is not present at runtime
 # =============================
 # Error class attributes that aren't defined.

stubs/grpcio/@tests/test_cases/check_aio.py

@@ -18,10 +18,10 @@
 # Metadata
 async def metadata() -> None:
     metadata = await typing.cast(grpc.aio.Call, None).initial_metadata()
-    assert_type(metadata["foo"], grpc.aio.MetadataValue)
+    assert_type(metadata["foo"], grpc.aio._MetadataValue)
     for k in metadata:
         assert_type(k, str)
 
     for k, v in metadata.items():
         assert_type(k, str)
-        assert_type(v, grpc.aio.MetadataValue)
+        assert_type(v, grpc.aio._MetadataValue)

stubs/grpcio/@tests/test_cases/check_grpc.py

@@ -41,6 +41,6 @@
 assert_type(call_details.timeout, typing.Optional[float])
 
 # Call iterator
-call_iter: grpc.CallIterator[str] = typing.cast(typing.Any, None)
+call_iter: grpc._CallIterator[str] = typing.cast(typing.Any, None)
 for call in call_iter:
     assert_type(call, str)