add handling to have informative 404 when a guard doesnt exist on openai

guardrails_api/blueprints/guards.py

@@ -178,6 +178,15 @@ def openai_v1_chat_completions(guard_name: str):
     decoded_guard_name = unquote_plus(guard_name)
     guard_struct = guard_client.get_guard(decoded_guard_name)
     guard = guard_struct
+    if guard_struct is None:
+        raise HttpError(
+            404,
+            "NotFound",
+            "A Guard with the name {guard_name} does not exist!".format(
+                guard_name=decoded_guard_name
+            ),
+        )
+
     if not isinstance(guard_struct, Guard):
         guard: Guard = Guard.from_dict(guard_struct.to_dict())
     stream = payload.get("stream", False)

guardrails_api/utils/handle_error.py

@@ -17,7 +17,7 @@ def decorator(*args, **kwargs):
             return str(validation_error), 400
         except HttpError as http_error:
             logger.error(http_error)
-            traceback.print_exception(http_error)
+            traceback.print_exception(type(http_error), http_error, http_error.__traceback__)
             return http_error.to_dict(), http_error.status
         except HTTPException as http_exception:
             logger.error(http_exception)

tests/blueprints/test_guards.py

@@ -614,6 +614,35 @@ def test_validate__call_throws_validation_error(mocker):
 
     del os.environ["PGHOST"]
 
+def test_openai_v1_chat_completions__raises_404(mocker):
+    from guardrails_api.blueprints.guards import openai_v1_chat_completions
+    os.environ["PGHOST"] = "localhost"
+    mock_guard = None
+
+    mock_request = MockRequest(
+        "POST",
+        json={
+            "messages": [{"role":"user", "content":"Hello world!"}],
+        },
+        headers={"x-openai-api-key": "mock-key"},
+    )
+
+    mocker.patch("flask.Blueprint", new=MockBlueprint)
+    mocker.patch("guardrails_api.blueprints.guards.request", mock_request)
+    mock_get_guard = mocker.patch(
+        "guardrails_api.blueprints.guards.guard_client.get_guard",
+        return_value=mock_guard,
+    )
+    mocker.patch("guardrails_api.blueprints.guards.CacheClient.set")
+    # expect 404 HttpError
+    with pytest.raises(Exception) as e:
+        response = openai_v1_chat_completions("My%20Guard's%20Name")
+    assert str(e.value) == '404 Not Found: Guard not found'
+
+    mock_get_guard.assert_called_once_with("My Guard's Name")
+
+    del os.environ["PGHOST"]
+
 def test_openai_v1_chat_completions__call(mocker):
     from guardrails_api.blueprints.guards import openai_v1_chat_completions
     os.environ["PGHOST"] = "localhost"