Propagate custom_info Dict through agent Resource

 - The agent defines a Resource return type with values:

   * outputs
   * message
   * log_links
   * phase

   These are all a part of the underlying protobuf contract defined in
   flyteidl.

   However, the message field custom_info from the protobuf is not here

   google.protobuf.Struct custom_info

   https://github.com/flyteorg/flyte/blob/519080b6e4e53fc0e216b5715ad9b5b5270f35c0/flyteidl/protos/flyteidl/admin/agent.proto#L140

   This field was added in flyteorg/flyte#4874
   but never made it into the corresponding flytekit PR
   #2146

 - It's useful for agents to return additional metadata about the job,
   and it looks like custom_info is the intended location

 - Make a minor refactor to how the agent responds to requests that
   return Resource by implementing to_flyte_idl / from_flyte_idl
   directly

Signed-off-by: ddl-ebrown <ethan.brown@dominodatalab.com>

flytekit/extend/backend/agent_service.py

@@ -16,7 +16,6 @@
     GetTaskResponse,
     ListAgentsRequest,
     ListAgentsResponse,
-    Resource,
 )
 from flyteidl.service.agent_pb2_grpc import (
     AgentMetadataServiceServicer,
@@ -25,8 +24,7 @@
 )
 from prometheus_client import Counter, Summary
 
-from flytekit import FlyteContext, logger
-from flytekit.core.type_engine import TypeEngine
+from flytekit import logger
 from flytekit.exceptions.system import FlyteAgentNotFound
 from flytekit.extend.backend.base_agent import AgentRegistry, SyncAgentBase, mirror_async_methods
 from flytekit.models.literals import LiteralMap
@@ -136,16 +134,7 @@ async def GetTask(self, request: GetTaskRequest, context: grpc.ServicerContext)
         logger.info(f"{agent.name} start checking the status of the job")
         res = await mirror_async_methods(agent.get, resource_meta=agent.metadata_type.decode(request.resource_meta))
 
-        if res.outputs is None:
-            outputs = None
-        elif isinstance(res.outputs, LiteralMap):
-            outputs = res.outputs.to_flyte_idl()
-        else:
-            ctx = FlyteContext.current_context()
-            outputs = TypeEngine.dict_to_literal_map_pb(ctx, res.outputs)
-        return GetTaskResponse(
-            resource=Resource(phase=res.phase, log_links=res.log_links, message=res.message, outputs=outputs)
-        )
+        return GetTaskResponse(resource=res.to_flyte_idl())
 
     @record_agent_metrics
     async def DeleteTask(self, request: DeleteTaskRequest, context: grpc.ServicerContext) -> DeleteTaskResponse:
@@ -175,17 +164,7 @@ async def ExecuteTaskSync(
                 literal_map = LiteralMap.from_flyte_idl(request.inputs) if request.inputs else None
                 res = await mirror_async_methods(agent.do, task_template=template, inputs=literal_map)
 
-                if res.outputs is None:
-                    outputs = None
-                elif isinstance(res.outputs, LiteralMap):
-                    outputs = res.outputs.to_flyte_idl()
-                else:
-                    ctx = FlyteContext.current_context()
-                    outputs = TypeEngine.dict_to_literal_map_pb(ctx, res.outputs)
-
-                header = ExecuteTaskSyncResponseHeader(
-                    resource=Resource(phase=res.phase, log_links=res.log_links, message=res.message, outputs=outputs)
-                )
+                header = ExecuteTaskSyncResponseHeader(resource=res.to_flyte_idl())
                 yield ExecuteTaskSyncResponse(header=header)
             request_success_count.labels(task_type=task_type, operation=do_operation).inc()
         except Exception as e:

flytekit/extend/backend/base_agent.py

@@ -12,9 +12,12 @@
 from typing import Any, Dict, List, Optional, Union
 
 from flyteidl.admin.agent_pb2 import Agent
+from flyteidl.admin.agent_pb2 import Resource as _Resource
 from flyteidl.admin.agent_pb2 import TaskCategory as _TaskCategory
 from flyteidl.core import literals_pb2
 from flyteidl.core.execution_pb2 import TaskExecution, TaskLog
+from google.protobuf import json_format
+from google.protobuf.struct_pb2 import Struct
 from rich.logging import RichHandler
 from rich.progress import Progress
 
@@ -90,6 +93,38 @@ class Resource:
     message: Optional[str] = None
     log_links: Optional[List[TaskLog]] = None
     outputs: Optional[Union[LiteralMap, typing.Dict[str, Any]]] = None
+    custom_info: Optional[typing.Dict[str, Any]] = None
+
+    def to_flyte_idl(self) -> _Resource:
+        if self.outputs is None:
+            outputs = None
+        elif isinstance(self.outputs, LiteralMap):
+            outputs = self.outputs.to_flyte_idl()
+        else:
+            ctx = FlyteContext.current_context()
+            outputs = TypeEngine.dict_to_literal_map_pb(ctx, self.outputs)
+
+        return Agent.Resource(
+            phase=self.phase,
+            message=self.message,
+            log_links=self.log_links,
+            outputs=outputs,
+            custom_info=(
+                json_format.Parse(json.dumps(self.custom_info), Struct.Struct()) if self.custom_info else None
+            ),
+        )
+
+    @classmethod
+    def from_flyte_idl(cls, pb2_object: _Resource):
+        return cls(
+            phase=pb2_object.phase,
+            message=pb2_object.message if pb2_object.HasField("message") else None,
+            log_links=(pb2_object.log_links if pb2_object.HasField("log_links") else None),
+            outputs=(LiteralMap.from_flyte_idl(pb2_object.outputs) if pb2_object.outputs else None),
+            custom_info=(
+                json_format.MessageToDict(pb2_object.custom_info) if pb2_object.HasField("custom_info") else None
+            ),
+        )
 
 
 class AgentBase(ABC):

tests/flytekit/unit/extend/test_agent.py

@@ -70,7 +70,11 @@ def create(self, task_template: TaskTemplate, inputs: typing.Optional[LiteralMap
         return DummyMetadata(job_id=dummy_id)
 
     def get(self, resource_meta: DummyMetadata, **kwargs) -> Resource:
-        return Resource(phase=TaskExecution.SUCCEEDED, log_links=[TaskLog(name="console", uri="localhost:3000")])
+        return Resource(
+            phase=TaskExecution.SUCCEEDED,
+            log_links=[TaskLog(name="console", uri="localhost:3000")],
+            custom_info={"custom": "info"},
+        )
 
     def delete(self, resource_meta: DummyMetadata, **kwargs):
         ...
@@ -95,7 +99,11 @@ async def create(
         return DummyMetadata(job_id=dummy_id, output_path=output_path, task_name=task_name)
 
     async def get(self, resource_meta: DummyMetadata, **kwargs) -> Resource:
-        return Resource(phase=TaskExecution.SUCCEEDED, log_links=[TaskLog(name="console", uri="localhost:3000")])
+        return Resource(
+            phase=TaskExecution.SUCCEEDED,
+            log_links=[TaskLog(name="console", uri="localhost:3000")],
+            custom_info={"custom": "info"},
+        )
 
     async def delete(self, resource_meta: DummyMetadata, **kwargs):
         ...
@@ -172,6 +180,7 @@ def test_dummy_agent():
     assert resource.phase == TaskExecution.SUCCEEDED
     assert resource.log_links[0].name == "console"
     assert resource.log_links[0].uri == "localhost:3000"
+    assert resource.custom_info["custom"] == "info"
     assert agent.delete(metadata) is None
 
     class DummyTask(AsyncAgentExecutorMixin, PythonFunctionTask):