feat: remove undocumented use of raw_socket in anyio

setup.py

@@ -63,8 +63,8 @@ def main():
         python_requires=">=3.5",
         install_requires=[
             "h2>=3.1.0,<4",
-            "protobuf~=3.6",
-            "anyio>=1.0.0b2,<2",
+            "protobuf>=3.5.1,<4",
+            "anyio>=1.0.0,<2",
             "async_exit_stack>=1.0.1,<2",
             "tblib>=1.3.2,<2",
             "async_generator>=1.10,<2.0",

src/purerpc/grpc_socket.py

@@ -16,9 +16,9 @@
 
 
 class SocketWrapper(async_exit_stack.AsyncExitStack):
-    def __init__(self, grpc_connection: GRPCConnection, sock: anyio._networking.SocketStream):
+    def __init__(self, grpc_connection: GRPCConnection, sock: anyio.SocketStream):
         super().__init__()
-        self._set_socket_options(sock._socket._raw_socket)
+        self._set_socket_options(sock)
         self._socket = sock
         self._grpc_connection = grpc_connection
         self._flush_event = anyio.create_event()
@@ -37,7 +37,7 @@ async def callback():
         return self
 
     @staticmethod
-    def _set_socket_options(sock):
+    def _set_socket_options(sock: anyio.SocketStream):
         sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
         if hasattr(socket, "TCP_KEEPIDLE"):
             sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, 300)