rpc logging in dev_appserver

log_rpcs.patch

diff --git a/google/appengine/api/apiproxy_rpc.py b/google/appengine/api/apiproxy_rpc.py
index 7e73bfd..b39c490 100644
--- a/google/appengine/api/apiproxy_rpc.py
+++ b/google/appengine/api/apiproxy_rpc.py
@@ -112,6 +112,18 @@ class RPC(object):
     assert self.__state is RPC.IDLE, ('RPC for %s.%s has already been started' %
                                       (self.package, self.call))
     assert self.callback is None or callable(self.callback)
+    call = self.callback
+    def c2(*args, **kwargs):
+      out = None
+      try:
+        if call:
+          out = call(*args, **kwargs)
+      finally:
+        response = len(self.response.result_) if self.response else 0
+        import logging, pprint
+        logging.error('CALLBACK: call %r, request %s, responses %s', self.call, pprint.pformat(vars(self.request)), response)
+        return out
+    self.callback = c2
     self._MakeCallImpl()
 
   def Wait(self):