[Serve] Enable serve status when proxies disabled (ray-project#42286)

Serve proxies can be disabled by setting serve.start(..., proxy_location=ProxyLocation.Disabled). However, serve status currently fails when proxies are disabled.

This change fixes the issue and lets serve status succeed even when proxy_location==ProxyLocation.Disabled.

---------

Signed-off-by: Shreyas Krishnaswamy <shrekris@anyscale.com>

python/ray/serve/_private/controller.py

@@ -54,7 +54,7 @@
     get_all_live_placement_group_names,
     get_head_node_id,
 )
-from ray.serve.config import HTTPOptions, gRPCOptions
+from ray.serve.config import HTTPOptions, ProxyLocation, gRPCOptions
 from ray.serve.generated.serve_pb2 import (
     ActorNameList,
     DeploymentArgs,
@@ -932,7 +932,7 @@ def get_serve_instance_details(self) -> Dict:
         return ServeInstanceDetails(
             target_capacity=self._target_capacity,
             controller_info=self._actor_details,
-            proxy_location=http_config.location,
+            proxy_location=ProxyLocation._from_deployment_mode(http_config.location),
             http_options=http_options,
             grpc_options=grpc_options,
             proxies=self.proxy_state_manager.get_proxy_details()

python/ray/serve/config.py

@@ -150,17 +150,44 @@ class ProxyLocation(str, Enum):
     EveryNode = "EveryNode"
 
     @classmethod
-    def _to_deployment_mode(cls, v: Union["ProxyLocation", str]) -> DeploymentMode:
-        if not isinstance(v, (cls, str)):
-            raise TypeError(f"Must be a `ProxyLocation` or str, got: {type(v)}.")
-        elif v == ProxyLocation.Disabled:
+    def _to_deployment_mode(
+        cls, proxy_location: Union["ProxyLocation", str]
+    ) -> DeploymentMode:
+        if isinstance(proxy_location, str):
+            proxy_location = ProxyLocation(proxy_location)
+        elif not isinstance(proxy_location, ProxyLocation):
+            raise TypeError(
+                f"Must be a `ProxyLocation` or str, got: {type(proxy_location)}."
+            )
+
+        if proxy_location == ProxyLocation.Disabled:
             return DeploymentMode.NoServer
-        elif v == ProxyLocation.HeadOnly:
-            return DeploymentMode.HeadOnly
-        elif v == ProxyLocation.EveryNode:
-            return DeploymentMode.EveryNode
         else:
-            raise ValueError(f"Unrecognized `ProxyLocation`: {v}.")
+            return DeploymentMode(proxy_location.value)
+
+    @classmethod
+    def _from_deployment_mode(
+        cls, deployment_mode: Optional[Union[DeploymentMode, str]]
+    ) -> Optional["ProxyLocation"]:
+        """Converts DeploymentMode enum into ProxyLocation enum.
+
+        DeploymentMode is a deprecated version of ProxyLocation that's still
+        used internally throughout Serve.
+        """
+
+        if deployment_mode is None:
+            return None
+        elif isinstance(deployment_mode, str):
+            deployment_mode = DeploymentMode(deployment_mode)
+        elif not isinstance(deployment_mode, DeploymentMode):
+            raise TypeError(
+                f"Must be a `DeploymentMode` or str, got: {type(deployment_mode)}."
+            )
+
+        if deployment_mode == DeploymentMode.NoServer:
+            return ProxyLocation.Disabled
+        else:
+            return ProxyLocation(deployment_mode.value)
 
 
 @PublicAPI(stability="stable")

python/ray/serve/tests/unit/test_config.py

@@ -545,6 +545,33 @@ def test_proxy_location_to_deployment_mode():
         ProxyLocation._to_deployment_mode({"some_other_obj"})
 
 
+def test_deployment_mode_to_proxy_location():
+    assert ProxyLocation._from_deployment_mode(None) is None
+
+    assert (
+        ProxyLocation._from_deployment_mode(DeploymentMode.NoServer)
+        == ProxyLocation.Disabled
+    )
+    assert (
+        ProxyLocation._from_deployment_mode(DeploymentMode.HeadOnly)
+        == ProxyLocation.HeadOnly
+    )
+    assert (
+        ProxyLocation._from_deployment_mode(DeploymentMode.EveryNode)
+        == ProxyLocation.EveryNode
+    )
+
+    assert ProxyLocation._from_deployment_mode("NoServer") == ProxyLocation.Disabled
+    assert ProxyLocation._from_deployment_mode("HeadOnly") == ProxyLocation.HeadOnly
+    assert ProxyLocation._from_deployment_mode("EveryNode") == ProxyLocation.EveryNode
+
+    with pytest.raises(ValueError):
+        ProxyLocation._from_deployment_mode("Unknown")
+
+    with pytest.raises(TypeError):
+        ProxyLocation._from_deployment_mode({"some_other_obj"})
+
+
 @pytest.mark.parametrize(
     "policy", [None, fake_policy, "ray.serve.tests.unit.test_config:fake_policy"]
 )