wireprotov2peer: use our CBOR decoder

wireprotov2peer: use our CBOR decoder

Behavior should be the same in order to preserve backwards
compatibility. We obviously want to stream values in this code.
We'll do that in subsequent commits.

Differential Revision: https://phab.mercurial-scm.org/D4470

--- a/mercurial/wireprotov2peer.py	Tue Aug 28 15:37:55 2018 -0700
+++ b/mercurial/wireprotov2peer.py	Tue Aug 28 15:41:09 2018 -0700
@@ -8,15 +8,15 @@
 from __future__ import absolute_import
 
 from .i18n import _
-from .thirdparty import (
-    cbor,
-)
 from . import (
     encoding,
     error,
     util,
     wireprotoframing,
 )
+from .utils import (
+    cborutil,
+)
 
 def formatrichmessage(atoms):
     """Format an encoded message from the framing protocol."""
@@ -44,13 +44,10 @@
 
     def cborobjects(self):
         """Obtain decoded CBOR objects from this response."""
-        size = self.b.tell()
         self.b.seek(0)
 
-        decoder = cbor.CBORDecoder(self.b)
-
-        while self.b.tell() < size:
-            yield decoder.decode()
+        for v in cborutil.decodeall(self.b.getvalue()):
+            yield v
 
 class clienthandler(object):
     """Object to handle higher-level client activities.