swarmbucket: add get_builders api

appengine/cr-buildbucket/swarming/test/swarmbucket_api_test.py

+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from components import auth
+from components import auth_testing
+from testing_utils import testing
+
+import config
+import swarming
+
+
+class SwarmbucketApiTest(testing.EndpointsTestCase):
+  api_service_cls = swarming.SwarmbucketApi
+
+  def test_get_builders(self):
+    auth_testing.reset_local_state()
+    auth.bootstrap_group('all', [auth.Anonymous])
+    config.Bucket(
+      id='master.tryserver.chromium',
+      project_id='chromium',
+      revision='deadbeef',
+      config_content="""
+        name: "master.tryserver.chromium"
+        acls {
+          role: READER
+          group: "all"
+        }
+        swarming {
+          builders {
+            name: "Windows"
+            category: "Chromium"
+          }
+          builders {
+            name: "Linux"
+            category: "Chromium"
+          }
+        }
+      """,
+    ).put()
+
+    config.Bucket(
+        id='master.tryserver.v8',
+        project_id='v8',
+        revision='deadbeef',
+        config_content="""
+          name: "master.tryserver.v8"
+          acls {
+            role: READER
+            group: "all"
+          }
+        """,
+    ).put()
+
+    config.Bucket(
+        id='secret',
+        project_id='secret',
+        revision='deadbeef',
+        config_content='name: "secret"',
+    ).put()
+
+    resp = self.call_api('get_builders').json_body
+    self.assertEqual(resp, {
+      'buckets': [
+        {
+          'name': 'master.tryserver.chromium',
+          'builders': [
+            {'name': 'Windows', 'category': 'Chromium'},
+            {'name': 'Linux', 'category': 'Chromium'},
+          ]
+        }
+      ]
+    })