File HANDLE/descriptor translation layer for Windows (#7657)

* Use TCP sockets on Windows with custom HANDLE <-> FD translation layer

* Get Plasma working on Windows

Co-authored-by: Mehrdad <noreply@github.com>

python/ray/node.py

@@ -89,6 +89,7 @@ class Node:
                 "workers/default_worker.py"))
 
         self._resource_spec = None
+        self._localhost = socket.gethostbyname("localhost")
         self._ray_params = ray_params
         self._redis_address = ray_params.redis_address
         self._config = ray_params._internal_config
@@ -396,15 +397,21 @@ class Node:
         Args:
             socket_path (string): the socket file to prepare.
         """
-        if socket_path is not None:
-            if os.path.exists(socket_path):
-                raise RuntimeError(
-                    "Socket file {} exists!".format(socket_path))
-            socket_dir = os.path.dirname(socket_path)
-            try_to_create_directory(socket_dir)
-            return socket_path
-        return self._make_inc_temp(
-            prefix=default_prefix, directory_name=self._sockets_dir)
+        result = socket_path
+        if sys.platform == "win32":
+            if socket_path is None:
+                result = "tcp://{}:{}".format(self._localhost,
+                                              self._get_unused_port())
+        else:
+            if socket_path is None:
+                result = self._make_inc_temp(
+                    prefix=default_prefix, directory_name=self._sockets_dir)
+            else:
+                if os.path.exists(socket_path):
+                    raise RuntimeError(
+                        "Socket file {} exists!".format(socket_path))
+                try_to_create_directory(os.path.dirname(socket_path))
+        return result
 
     def start_reaper_process(self):
         """