peer: introduce a limitedarguments attributes

When set to True, it signal that the peer cannot receive too larges arguments
and that algorithm must adapt. This should only be True for http peer that does
not support argument passed as "post".

This will be useful to unlock better discovery performance in the next
changesets.

I am using a dedicated argument because this is not really a usual
"capabilities" things. An alternative approach would be to adds a
"large-arguments" to all peer, but the http peers. That seemed a bit too hacky
to me.

mercurial/httppeer.py

@@ -382,6 +382,7 class httppeer(wireprotov1peer.wirepeer)
         self._path = path
         self._url = url
         self._caps = caps
+        self.limitedarguments = caps is not None and 'httppostargs' not in caps
         self._urlopener = opener
         self._requestbuilder = requestbuilder
 
@@ -750,6 +751,9 class httpv2executor(object):
 
 @interfaceutil.implementer(repository.ipeerv2)
 class httpv2peer(object):
+
+    limitedarguments = False
+
     def __init__(self, ui, repourl, apipath, opener, requestbuilder,
                  apidescriptor):
         self.ui = ui

mercurial/repository.py

@@ -291,6 +291,10 class ipeercommandexecutor(interfaceutil
 class ipeerrequests(interfaceutil.Interface):
     """Interface for executing commands on a peer."""
 
+    limitedarguments = interfaceutil.Attribute(
+        """True if the peer cannot receive large argument value for commands."""
+    )
+
     def commandexecutor():
         """A context manager that resolves to an ipeercommandexecutor.
 
@@ -329,6 +333,8 class ipeerv2(ipeerconnection, ipeercapa
 class peer(object):
     """Base class for peer repositories."""
 
+    limitedarguments = False
+
     def capable(self, name):
         caps = self.capabilities()
         if name in caps: