Add Versions API to Drydock

This ps adds a VersionsResource that returns a list of API versions
available and includes unit tests for get_versions and get_health

Change-Id: Ibcbc2af79cf5e441b59d64da9a1c7f951eff0563

drydock_provisioner/control/api.py

@@ -24,7 +24,7 @@ from .bootdata import BootdataResource
 from .nodes import NodesResource
 from .health import HealthResource
 
-from .base import DrydockRequest
+from .base import DrydockRequest, BaseResource
 from .middleware import AuthMiddleware, ContextMiddleware, LoggingMiddleware
 
 
@@ -46,6 +46,8 @@ def start_api(state_manager=None, ingester=None, orchestrator=None):
             LoggingMiddleware()
         ])
 
+    control_api.add_route('/versions', VersionsResource())
+
     # v1.0 of Drydock API
     v1_0_routes = [
         # API for managing orchestrator tasks
@@ -77,3 +79,17 @@ def start_api(state_manager=None, ingester=None, orchestrator=None):
         control_api.add_route('/api/v1.0' + path, res)
 
     return control_api
+
+
+class VersionsResource(BaseResource):
+    """
+    Lists the versions supported by this API
+    """
+
+    def on_get(self, req, resp):
+        resp.body = self.to_json({
+            'v1.0': {
+                'path': '/api/v1.0',
+                'status': 'stable'
+            }})
+        resp.status = falcon.HTTP_200

drydock_provisioner/control/base.py

@@ -82,6 +82,12 @@ class BaseResource(object):
 
         self.logger.log(level, msg, extra=extra)
 
+    def to_json(self, body_dict):
+        """
+        Thin wrapper around json.dumps, providing the default=str config
+        """
+        return json.dumps(body_dict, default=str)
+
     def debug(self, ctx, msg):
         self.log_error(ctx, logging.DEBUG, msg)
 

tests/unit/test_api_health.py

@@ -0,0 +1,30 @@
+# Copyright 2017 AT&T Intellectual Property.  All other rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Test Health API"""
+
+from drydock_provisioner.control.health import HealthResource
+
+import falcon
+
+
+def test_get_health(mocker):
+    api = HealthResource()
+
+    # Configure mocked request and response
+    req = mocker.MagicMock(spec=falcon.Request)
+    resp = mocker.MagicMock(spec=falcon.Response)
+
+    api.on_get(req, resp)
+
+    assert resp.status == falcon.HTTP_204

tests/unit/test_api_versions.py

@@ -0,0 +1,33 @@
+# Copyright 2017 AT&T Intellectual Property.  All other rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Test Versions API"""
+
+from drydock_provisioner.control.api import VersionsResource
+
+import falcon
+
+
+def test_get_versions(mocker):
+    api = VersionsResource()
+
+    # Configure mocked request and response
+    req = mocker.MagicMock(spec=falcon.Request)
+    resp = mocker.MagicMock(spec=falcon.Response)
+
+    api.on_get(req, resp)
+
+    expected = api.to_json({'v1.0': {'path': '/api/v1.0', 'status': 'stable'}})
+
+    assert resp.body == expected
+    assert resp.status == falcon.HTTP_200