# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@fb.com>
# Date 2014-04-15 21:19:46
# Node ID 0879352d67d8322e485006456d8adbfae3654d6e
# Parent  19b9f23a8c6fa34e0677d21419ffdf6d0b7b92a8

wireproto: add a _calltwowaystream method on wirepeer

This method will be used by bundle2 pushes. It calls a command, feeds it with a
stream and receives another stream in reply.

Actual implementation for ssh and http will be done in later changesets.

diff --git a/mercurial/wireproto.py b/mercurial/wireproto.py
--- a/mercurial/wireproto.py
+++ b/mercurial/wireproto.py
@@ -415,6 +415,13 @@ class wirepeer(peer.peerrepository):
         """
         raise NotImplementedError()
 
+    def _calltwowaystream(self, cmd, fp, **args):
+        """execute <cmd> on server
+
+        The command will send a stream to the server and get a stream in reply.
+        """
+        raise NotImplementedError()
+
     def _abort(self, exception):
         """clearly abort the wire protocol connection and raise the exception
         """