my_activity: Port gerrit to the new gerrit_util API.

gerrit_util.py

Index: gerrit_util.py
diff --git a/gerrit_util.py b/gerrit_util.py
index 7c44f03107468de934940bd1bf7646630818c53f..0a677b02e774786fb591d47ca4b8e0d101a0052b 100755
--- a/gerrit_util.py
+++ b/gerrit_util.py
@@ -180,6 +180,42 @@ def QueryChanges(host, param_dict, first_param=None, limit=None, o_params=None,
   return ReadHttpJsonResponse(CreateHttpConn(host, path), ignore_404=False)
 
 
+def QueryAllChanges(host, param_dict, first_param=None, limit=500,
+                    o_params=None, sortkey=None):
+  """
+  Queries a gerrit-on-borg server for all the changes matching the query terms.
+
+  A single query to gerrit-on-borg is limited on the number of results by the
+  limit parameter on the request (see QueryChanges) and the server maximum
+  limit. This function uses the "_more_changes" and "_sortkey" attributes on
+  the returned changes to iterate all of them making multiple queries to the
+  server, regardless the query limit.
+
+  Args:
+    param_dict: A dictionary of search parameters, as documented here:
+        http://gerrit-documentation.googlecode.com/svn/Documentation/2.6/user-search.html
+    first_param: A change identifier.
+    limit: Maximum number of requested changes per query.
+    o_params: A list of additional output specifiers, as documented here:
+        https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#list-changes
+    sortkey: The value of the "_sortkey" attribute where starts from. None to
+        start from the first change.
+
+  Returns:
+    A generator object to the list of returned changes, possibly unbound.
+  """
+  more_changes = True
+  while more_changes:
+    page = QueryChanges(host, param_dict, first_param, limit, o_params, sortkey)
+    for cl in page:
+      yield cl
+
+    more_changes = [cl for cl in page if '_more_changes' in cl]
+    sortkey = None
+    if more_changes:
+      sortkey = more_changes[0]['_sortkey']
+
+
 def MultiQueryChanges(host, param_dict, change_list, limit=None, o_params=None,
                       sortkey=None):
   """Initiate a query composed of multiple sets of query parameters."""