Support latest as the microversion value

Adds support to use latest as the microversion value. When set to
latest, the maximum version is assumed by ironic-inspector.

Story: 1672400
Task: 11363

Change-Id: I35be1034697a7d69ed30af9542d9711fb2f65bd0

ironic_inspector/main.py

@@ -49,10 +49,13 @@ def _get_version():
     ver = flask.request.headers.get(conf_opts.VERSION_HEADER,
                                     _DEFAULT_API_VERSION)
     try:
-        requested = tuple(int(x) for x in ver.split('.'))
+        if ver.lower() == 'latest':
+            requested = CURRENT_API_VERSION
+        else:
+            requested = tuple(int(x) for x in ver.split('.'))
     except (ValueError, TypeError):
         return error_response(_('Malformed API version: expected string '
-                                'in form of X.Y'), code=400)
+                                'in form of X.Y or latest'), code=400)
     return requested
 
 

ironic_inspector/test/unit/test_main.py

@@ -633,6 +633,12 @@ class TestApiVersions(BaseAPITest):
         self.assertIn('%d.%d' % main.MINIMUM_API_VERSION, error)
         self.assertIn('%d.%d' % main.CURRENT_API_VERSION, error)
 
+    def test_request_latest_version(self):
+        headers = {conf_opts.VERSION_HEADER: 'latest'}
+        res = self.app.get('/', headers=headers)
+        self.assertEqual(200, res.status_code)
+        self._check_version_present(res)
+
 
 class TestPlugins(unittest.TestCase):
     @mock.patch.object(example_plugin.ExampleProcessingHook,

releasenotes/notes/support-microversion-latest-dcf9598c5218e979.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Adds support to use ``latest`` as the microversion value in the request
+    to the ironic-inspector API.