http: work around custom http client classes that refuse extra attrs stable

http: work around custom http client classes that refuse extra attrs

I have no idea what is going on with our custom http client code at Google,
but it chokes on these extra attributes we're tucking on http clients. Since
it feels more than a little wrong to just stuff extra data on a client, let's
degrade gracefully when the client class refuses the attributes.

--- a/mercurial/httppeer.py	Thu Oct 25 21:33:43 2018 +0800
+++ b/mercurial/httppeer.py	Mon Oct 29 16:23:42 2018 -0400
@@ -405,11 +405,15 @@
         return True
 
     def close(self):
+        try:
+            reqs, sent, recv = (self._urlopener.requestscount,
+                                self._urlopener.sentbytescount,
+                                self._urlopener.receivedbytescount)
+        except AttributeError:
+            return
         self.ui.note(_('(sent %d HTTP requests and %d bytes; '
                        'received %d bytes in responses)\n') %
-                     (self._urlopener.requestscount,
-                      self._urlopener.sentbytescount,
-                      self._urlopener.receivedbytescount))
+                     (reqs, sent, recv))
 
     # End of ipeerconnection interface.
 

--- a/mercurial/keepalive.py	Thu Oct 25 21:33:43 2018 +0800
+++ b/mercurial/keepalive.py	Mon Oct 29 16:23:42 2018 -0400
@@ -442,7 +442,10 @@
         data = self._raw_read(amt)
 
         self.receivedbytescount += len(data)
-        self._connection.receivedbytescount += len(data)
+        try:
+            self._connection.receivedbytescount += len(data)
+        except AttributeError:
+            pass
         try:
             self._handler.parent.receivedbytescount += len(data)
         except AttributeError: