Add size properties to MasterSlaveConnection PYTHON-414

Needed for batch inserts.

Author: behackett

pymongo/master_slave_connection.py

@@ -117,6 +117,25 @@ def set_document_class(self, klass):
  def tz_aware(self):
  return self.__tz_aware
 
+ @property
+ def max_bson_size(self):
+ """Return the maximum size BSON object the connected master
+ accepts in bytes. Defaults to 4MB in server < 1.7.4.
+
+ .. versionadded:: 2.6
+ """
+ return self.master.max_bson_size
+
+ @property
+ def max_message_size(self):
+ """Return the maximum message size the connected master
+ accepts in bytes.
+
+ .. versionadded:: 2.6
+ """
+ return self.master.max_message_size
+
+
  def disconnect(self):
  """Disconnect from MongoDB.