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fix: Fix messages format in NVIDIA safety check request body (#2063)

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# What does this PR do?
When running a Llama Stack server and invoking the
`/v1/safety/run-shield` endpoint, the NVIDIA Guardrails endpoint in some
cases errors with a `422: Unprocessable Entity` due to malformed input.

For example, given an request body like:
```
{
  "model": "test",
  "messages": [
    { "role": "user", "content": "You are stupid." }
  ]
}
```
`convert_pydantic_to_json_value` converts the message to:
```
{ "role": "user", "content": "You are stupid.", "context": null }
```
Which causes NVIDIA Guardrails to return an error `HTTPError: 422 Client
Error: Unprocessable Entity for url:
http://nemo.test/v1/guardrail/checks`, because `context` shouldn't be
included in the body.

[//]: # (If resolving an issue, uncomment and update the line below)
[//]: # (Closes #[issue-number])

## Test Plan
I ran the Llama Stack server locally and manually verified that the
endpoint now succeeds.

```
message = {"role": "user", "content": "You are stupid."}
response = client.safety.run_shield(messages=[message], shield_id=shield_id, params={})
```
Server logs:
```
14:29:09.656 [START] /v1/safety/run-shield
INFO:     127.0.0.1:54616 - "POST /v1/safety/run-shield HTTP/1.1" 200 OK
14:29:09.918 [END] /v1/safety/run-shield [StatusCode.OK] (262.26ms
```

[//]: # (## Documentation)

Co-authored-by: Jash Gulabrai <jgulabrai@nvidia.com>
This commit is contained in:
Jash Gulabrai 2025-04-30 12:01:28 -04:00 • committed by GitHub
parent 4412694018
commit eab550f7d2
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2 changed files with 9 additions and 10 deletions
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13
tests/unit/providers/nvidia/test_safety.py
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@ -4,7 +4,6 @@
# This source code is licensed under the terms described in the LICENSE file in
# the root directory of this source tree.
import json
import os
import unittest
from typing import Any
@ -139,8 +138,8 @@ class TestNVIDIASafetyAdapter(unittest.TestCase):
data={
"model": shield_id,
"messages": [
json.loads(messages[0].model_dump_json()),
json.loads(messages[1].model_dump_json()),
{"role": "user", "content": "Hello, how are you?"},
{"role": "assistant", "content": "I'm doing well, thank you for asking!"},
],
"temperature": 1.0,
"top_p": 1,
@ -193,8 +192,8 @@ class TestNVIDIASafetyAdapter(unittest.TestCase):
data={
"model": shield_id,
"messages": [
json.loads(messages[0].model_dump_json()),
json.loads(messages[1].model_dump_json()),
{"role": "user", "content": "Hello, how are you?"},
{"role": "assistant", "content": "I'm doing well, thank you for asking!"},
],
"temperature": 1.0,
"top_p": 1,
@ -269,8 +268,8 @@ class TestNVIDIASafetyAdapter(unittest.TestCase):
data={
"model": shield_id,
"messages": [
json.loads(messages[0].model_dump_json()),
json.loads(messages[1].model_dump_json()),
{"role": "user", "content": "Hello, how are you?"},
{"role": "assistant", "content": "I'm doing well, thank you for asking!"},
],
"temperature": 1.0,
"top_p": 1,