Add endpoint and cron job to aggregate all dimensions and values

appengine/swarming/handlers_endpoints_test.py

 #!/usr/bin/env python
 # coding=utf-8
 # Copyright 2015 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 import base64
 import datetime
 import json
 import logging
@@ skipping 1473 matching lines @@
       u'quarantined': u'0',
       u'dead': u'0',
       u'busy': u'0',
       u'now': unicode(now.strftime(self.DATETIME_FORMAT)),
     }
     self.assertEqual(expected, response.json)
 
     request = swarming_rpcs.BotsRequest(dimensions=['bad'])
     self.call_api('count', body=message_to_dict(request), status=400)
 
+  def test_dimensions_ok(self):
+    """Asserts that BotsDimensions is returned with the right data."""
+    self.set_as_privileged_user()
+    self.mock_now(datetime.datetime(2009, 1, 2, 3, 4, 5, 6))
+
+    aggregate = bot_management.DimensionAggregation(
+      id='current',
+      dimensions=[
+        bot_management.DimensionValues(dimension='foo',
+          values=['alpha', 'beta']),
+        bot_management.DimensionValues(dimension='bar',
+          values=['gamma', 'delta', 'epsilon']),
+      ])
+    aggregate.put()
+
+    expected = {
+      u'fleet_dimensions': [
+        {
+          u'key': 'foo',
+          u'value': [u'alpha', u'beta'],
+        },
+        {
+          u'key': 'bar',
+          u'value': [u'gamma', u'delta', u'epsilon'],
+        },
+      ]
+    }
+
+    response = self.call_api('dimensions', body={})
+    self.assertEqual(expected, response.json)
+
+
 class BotApiTest(BaseTest):
   api_service_cls = handlers_endpoints.SwarmingBotService
 
   def test_get_ok(self):
     """Asserts that get shows the tasks a specific bot has executed."""
     self.set_as_privileged_user()
     now = datetime.datetime(2010, 1, 2, 3, 4, 5, 6)
     self.mock_now(now)
     now_str = unicode(now.strftime(self.DATETIME_FORMAT))
     bot_management.bot_event(
@@ skipping 236 matching lines @@
     self.assertEqual(expected, response.json)
 
 
 if __name__ == '__main__':
   if '-v' in sys.argv:
     unittest.TestCase.maxDiff = None
     logging.basicConfig(level=logging.DEBUG)
   else:
     logging.basicConfig(level=logging.CRITICAL)
   unittest.main()