[Serve] Ensure SimpleSchemaIngress uses FastAPI custom serializers

python/ray/serve/drivers.py

@@ -2,6 +2,7 @@
 from abc import abstractmethod
 from typing import Any, Callable, Optional, Type, Union
 from pydantic import BaseModel
+from ray.serve.utils import install_serve_encoders_to_fastapi
 
 import starlette
 from fastapi import Body, Depends, FastAPI
@@ -56,6 +57,7 @@ def __init__(
               resolver. When you pass in a string, Serve will import it.
               Please refer to Serve HTTP adatper documentation to learn more.
         """
+        install_serve_encoders_to_fastapi()
         http_adapter = load_http_adapter(http_adapter)
         self.app = FastAPI()
 

python/ray/serve/tests/test_pipeline_driver.py

@@ -1,4 +1,5 @@
 import sys
+import numpy as np
 from pydantic import BaseModel
 
 import pytest
@@ -156,5 +157,18 @@ def test_dag_driver_partial_input(serve_instance):
     assert resp.json() == [1, 2, [3, 4]]
 
 
+@serve.deployment
+def return_np_int(_):
+    return [np.int64(42)]
+
+
+def test_driver_np_serializer(serve_instance):
+    # https://github.com/ray-project/ray/pull/24215#issuecomment-1115237058
+    with InputNode() as inp:
+        dag = DAGDriver.bind(return_np_int.bind(inp))
+    serve.run(dag)
+    assert requests.get("http://127.0.0.1:8000/").json() == [42]
+
+
 if __name__ == "__main__":
     sys.exit(pytest.main(["-v", "-s", __file__]))

python/ray/serve/utils.py

@@ -16,6 +16,7 @@
 import numpy as np
 import pydantic
 import pydantic.json
+import fastapi.encoders
 
 import ray
 import ray.serialization_addons
@@ -80,6 +81,12 @@ def install_serve_encoders_to_fastapi():
     """Inject Serve's encoders so FastAPI's jsonable_encoder can pick it up."""
     # https://stackoverflow.com/questions/62311401/override-default-encoders-for-jsonable-encoder-in-fastapi # noqa
     pydantic.json.ENCODERS_BY_TYPE.update(serve_encoders)
+    # FastAPI cache these encoders at import time, so we also needs to refresh it.
+    fastapi.encoders.encoders_by_class_tuples = (
+        fastapi.encoders.generate_encoders_by_class_tuples(
+            pydantic.json.ENCODERS_BY_TYPE
+        )
+    )
 
 
 @ray.remote(num_cpus=0)