Add in tool to suggest rechecks for bad votes

This tool figures out negative votes left on latest patchsets by
a user in gerrit and suggests an enqueue command that can be given
to zuul to recheck it.

Change-Id: I27d6bd07fdb7a5e99fff32a75dba8af0d75c7698

tools/zuul_enqueue.py

@@ -0,0 +1,87 @@
+#!/usr/bin/python
+# This tool is useful to query gerrit for negative or missing votes left by
+# a user. It may require tweaking for different failure messages etc.
+
+import json
+import requests
+import traceback
+
+# Set the user to watch
+user = 'turbo-hipster'
+
+# Grab a list of missing or negative reviews for a user:
+url = ("https://review.openstack.org/changes/?q=status:open "
+       "project:openstack/nova NOT label:Verified>=0,%s "
+       "branch:master&o=CURRENT_REVISION&o=MESSAGES" % user)
+
+print "Grabbing reviews from %s" % url
+r = requests.get(url)
+
+no_votes = []
+negative_votes = []
+merge_failures = []
+unknown = []
+
+for change in json.loads(r.text[5:]):
+    try:
+        patchset = change['revisions'][change['current_revision']]['_number']
+        change_id = str(change['_number']) + ',' + str(patchset)
+        last_message = None
+        for message in sorted(change['messages'],
+                              key=lambda k: (k['_revision_number'],
+                                             k['date']), reverse=True):
+            if message['_revision_number'] < patchset:
+                # Finished looking at all the messages on this patchset
+                break
+            if message['author']['name'] == user:
+                last_message = message['message']
+                break
+
+        if not last_message:
+            # turbo-hister hasn't commented on this patchset
+            no_votes.append({
+                'change_id': change_id,
+                'updated': change['updated'],
+                'change': change
+            })
+        elif ('This change was unable to be automatically merged with the '
+              'current state of the repository.' in last_message):
+            merge_failures.append({
+                'change_id': change_id,
+                'updated': change['updated'],
+                'change': change
+            })
+        elif 'Database migration testing failed' in last_message:
+            negative_votes.append({
+                'change_id': change_id,
+                'updated': change['updated'],
+                'change': change
+            })
+        else:
+            unknown.append({
+                'change_id': change_id,
+                'updated': change['updated'],
+                'change': change
+            })
+
+    except Exception:
+        print "Something failed.. Here is the change..."
+        print change
+        traceback.print_exc()
+
+
+def print_enqueues(changes):
+    for change in sorted(changes, key=lambda k: k['updated'], reverse=True):
+        print ("zuul enqueue --trigger gerrit --pipeline check "
+               "--project openstack/nova --change %s" % (change['change_id']))
+
+print "=" * 20 + (" Changes with no votes (%d) " % len(no_votes)) + "=" * 20
+print_enqueues(no_votes)
+print ("=" * 20 + (" Changes with negative votes (%d) " % len(negative_votes))
+       + "=" * 20)
+print_enqueues(negative_votes)
+print ("=" * 20 + (" Changes with merge failure (%d) " % len(merge_failures)) +
+       "=" * 20)
+print_enqueues(merge_failures)
+print "=" * 20 + (" Others in this query (%d) " % len(unknown)) + "=" * 20
+print_enqueues(unknown)