Add ITK test suite

Author: Krzysztof Dziedzic

.github/actions/spelling/allow.txt

@@ -62,7 +62,10 @@ initdb
 inmemory
 INR
 isready
+itk
+ITK
 jcs
+jit
 jku
 JOSE
 JPY
@@ -106,11 +109,13 @@ protoc
 pydantic
 pyi
 pypistats
+pyproto
 pyupgrade
 pyversions
 redef
 respx
 resub
+rmi
 RS256
 RUF
 SECP256R1
@@ -127,7 +132,7 @@ taskupdate
 testuuid
 Tful
 tiangolo
+TResponse
 typ
 typeerror
 vulnz
-TResponse

itk/__init__.py

@@ -0,0 +1,353 @@
+import argparse  # noqa: I001
+import asyncio
+import base64
+import logging
+import uuid
+
+import grpc
+import httpx
+import uvicorn
+
+from fastapi import FastAPI
+
+from pyproto import instruction_pb2
+
+from a2a.client import ClientConfig, ClientFactory
+from a2a.compat.v0_3 import a2a_v0_3_pb2_grpc
+from a2a.compat.v0_3.grpc_handler import CompatGrpcHandler
+from a2a.server.agent_execution import AgentExecutor, RequestContext
+from a2a.server.apps import A2AFastAPIApplication, A2ARESTFastAPIApplication
+from a2a.server.events import EventQueue
+from a2a.server.events.in_memory_queue_manager import InMemoryQueueManager
+from a2a.server.request_handlers import DefaultRequestHandler, GrpcHandler
+from a2a.server.tasks import TaskUpdater
+from a2a.server.tasks.inmemory_task_store import InMemoryTaskStore
+from a2a.types import a2a_pb2_grpc
+from a2a.types.a2a_pb2 import (
+    AgentCapabilities,
+    AgentCard,
+    AgentInterface,
+    Message,
+    Part,
+    SendMessageRequest,
+    TaskState,
+)
+from a2a.utils import TransportProtocol
+
+
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+
+
+def extract_instruction(
+    message: Message | None,
+) -> instruction_pb2.Instruction | None:
+    """Extracts an Instruction proto from an A2A Message."""
+    if not message or not message.parts:
+        return None
+
+    for part in message.parts:
+        # 1. Handle binary protobuf part (media_type or filename)
+        if (
+            part.media_type == 'application/x-protobuf'
+            or part.filename == 'instruction.bin'
+        ):
+            try:
+                inst = instruction_pb2.Instruction()
+                if part.raw:
+                    inst.ParseFromString(part.raw)
+                elif part.text:
+                    # Some clients might send it as base64 in text part
+                    raw = base64.b64decode(part.text)
+                    inst.ParseFromString(raw)
+            except Exception:  # noqa: BLE001
+                logger.debug(
+                    'Failed to parse instruction from binary part',
+                    exc_info=True,
+                )
+                continue
+            else:
+                return inst
+
+        # 2. Handle base64 encoded instruction in any text part
+        if part.text:
+            try:
+                raw = base64.b64decode(part.text)
+                inst = instruction_pb2.Instruction()
+                inst.ParseFromString(raw)
+            except Exception:  # noqa: BLE001
+                logger.debug(
+                    'Failed to parse instruction from text part', exc_info=True
+                )
+                continue
+            else:
+                return inst
+    return None
+
+
+def wrap_instruction_to_request(inst: instruction_pb2.Instruction) -> Message:
+    """Wraps an Instruction proto into an A2A Message."""
+    inst_bytes = inst.SerializeToString()
+    return Message(
+        role='ROLE_USER',
+        message_id=str(uuid.uuid4()),
+        parts=[
+            Part(
+                raw=inst_bytes,
+                media_type='application/x-protobuf',
+                filename='instruction.bin',
+            )
+        ],
+    )
+
+
+async def handle_call_agent(call: instruction_pb2.CallAgent) -> list[str]:
+    """Handles the CallAgent instruction by invoking another agent."""
+    logger.info('Calling agent %s via %s', call.agent_card_uri, call.transport)
+
+    # Mapping transport string to TransportProtocol enum
+    transport_map = {
+        'JSONRPC': TransportProtocol.JSONRPC,
+        'HTTP+JSON': TransportProtocol.HTTP_JSON,
+        'HTTP_JSON': TransportProtocol.HTTP_JSON,
+        'REST': TransportProtocol.HTTP_JSON,
+        'GRPC': TransportProtocol.GRPC,
+    }
+
+    selected_transport = transport_map.get(
+        call.transport.upper(), TransportProtocol.JSONRPC
+    )
+    if selected_transport is None:
+        raise ValueError(f'Unsupported transport: {call.transport}')
+
+    config = ClientConfig()
+    config.httpx_client = httpx.AsyncClient(timeout=30.0)
+    config.grpc_channel_factory = grpc.aio.insecure_channel
+    config.supported_protocol_bindings = [selected_transport]
+    config.streaming = call.streaming or (
+        selected_transport == TransportProtocol.GRPC
+    )
+
+    try:
+        client = await ClientFactory.connect(
+            call.agent_card_uri,
+            client_config=config,
+        )
+
+        # Wrap nested instruction
+        nested_msg = wrap_instruction_to_request(call.instruction)
+        request = SendMessageRequest(message=nested_msg)
+
+        results = []
+        async for event in client.send_message(request):
+            # Event is streaming response and task
+            logger.info('Event: %s', event)
+            stream_resp, task = event
+
+            message = None
+            if stream_resp.HasField('message'):
+                message = stream_resp.message
+            elif task and task.status.HasField('message'):
+                message = task.status.message
+            elif stream_resp.HasField(
+                'status_update'
+            ) and stream_resp.status_update.status.HasField('message'):
+                message = stream_resp.status_update.status.message
+
+            if message:
+                results.extend(part.text for part in message.parts if part.text)
+
+    except Exception as e:
+        logger.exception('Failed to call outbound agent')
+        raise RuntimeError(
+            f'Outbound call to {call.agent_card_uri} failed: {e!s}'
+        ) from e
+    else:
+        return results
+
+
+async def handle_instruction(inst: instruction_pb2.Instruction) -> list[str]:
+    """Recursively handles instructions."""
+    if inst.HasField('call_agent'):
+        return await handle_call_agent(inst.call_agent)
+    if inst.HasField('return_response'):
+        return [inst.return_response.response]
+    if inst.HasField('steps'):
+        all_results = []
+        for step in inst.steps.instructions:
+            results = await handle_instruction(step)
+            all_results.extend(results)
+        return all_results
+    raise ValueError('Unknown instruction type')
+
+
+class V10AgentExecutor(AgentExecutor):
+    """Executor for ITK v10 agent tasks."""
+
+    async def execute(
+        self, context: RequestContext, event_queue: EventQueue
+    ) -> None:
+        """Executes a task instruction."""
+        logger.info('Executing task %s', context.task_id)
+        task_updater = TaskUpdater(
+            event_queue,
+            context.task_id,
+            context.context_id,
+        )
+
+        await task_updater.update_status(TaskState.TASK_STATE_SUBMITTED)
+        await task_updater.update_status(TaskState.TASK_STATE_WORKING)
+
+        instruction = extract_instruction(context.message)
+        if not instruction:
+            error_msg = 'No valid instruction found in request'
+            logger.error(error_msg)
+            await task_updater.update_status(
+                TaskState.TASK_STATE_FAILED,
+                message=task_updater.new_agent_message([Part(text=error_msg)]),
+            )
+            return
+
+        try:
+            logger.info('Instruction: %s', instruction)
+            results = await handle_instruction(instruction)
+            response_text = '\n'.join(results)
+            logger.info('Response: %s', response_text)
+            await task_updater.update_status(
+                TaskState.TASK_STATE_COMPLETED,
+                message=task_updater.new_agent_message(
+                    [Part(text=response_text)]
+                ),
+            )
+            logger.info('Task %s completed', context.task_id)
+        except Exception as e:
+            logger.exception('Error during instruction handling')
+            await task_updater.update_status(
+                TaskState.TASK_STATE_FAILED,
+                message=task_updater.new_agent_message([Part(text=str(e))]),
+            )
+
+    async def cancel(
+        self, context: RequestContext, event_queue: EventQueue
+    ) -> None:
+        """Cancels a task."""
+        logger.info('Cancel requested for task %s', context.task_id)
+        task_updater = TaskUpdater(
+            event_queue,
+            context.task_id,
+            context.context_id,
+        )
+        await task_updater.update_status(TaskState.TASK_STATE_CANCELED)
+
+
+async def main_async(http_port: int, grpc_port: int) -> None:
+    """Starts the Agent with HTTP and gRPC interfaces."""
+    interfaces = [
+        AgentInterface(
+            protocol_binding=TransportProtocol.GRPC,
+            url=f'127.0.0.1:{grpc_port}',
+            protocol_version='1.0',
+        ),
+        AgentInterface(
+            protocol_binding=TransportProtocol.GRPC,
+            url=f'127.0.0.1:{grpc_port}',
+            protocol_version='0.3',
+        ),
+    ]
+
+    interfaces.append(
+        AgentInterface(
+            protocol_binding=TransportProtocol.JSONRPC,
+            url=f'http://127.0.0.1:{http_port}/jsonrpc/',
+        )
+    )
+    interfaces.append(
+        AgentInterface(
+            protocol_binding=TransportProtocol.HTTP_JSON,
+            url=f'http://127.0.0.1:{http_port}/rest/',
+            protocol_version='1.0',
+        )
+    )
+    interfaces.append(
+        AgentInterface(
+            protocol_binding=TransportProtocol.HTTP_JSON,
+            url=f'http://127.0.0.1:{http_port}/rest/',
+            protocol_version='0.3',
+        )
+    )
+
+    agent_card = AgentCard(
+        name='ITK v10 Agent',
+        description='Python agent using SDK 1.0.',
+        version='1.0.0',
+        capabilities=AgentCapabilities(streaming=True),
+        default_input_modes=['text/plain'],
+        default_output_modes=['text/plain'],
+        supported_interfaces=interfaces,
+    )
+
+    task_store = InMemoryTaskStore()
+    handler = DefaultRequestHandler(
+        agent_executor=V10AgentExecutor(),
+        task_store=task_store,
+        queue_manager=InMemoryQueueManager(),
+    )
+
+    app = FastAPI()
+
+    json_rpc_app = A2AFastAPIApplication(
+        agent_card, handler, enable_v0_3_compat=True
+    ).build()
+    app.mount('/jsonrpc', json_rpc_app)
+    rest_app = A2ARESTFastAPIApplication(
+        http_handler=handler, agent_card=agent_card, enable_v0_3_compat=True
+    ).build()
+    app.mount('/rest', rest_app)
+
+    server = grpc.aio.server()
+
+    compat_servicer = CompatGrpcHandler(agent_card, handler)
+    a2a_v0_3_pb2_grpc.add_A2AServiceServicer_to_server(compat_servicer, server)
+    servicer = GrpcHandler(agent_card, handler)
+    a2a_pb2_grpc.add_A2AServiceServicer_to_server(servicer, server)
+
+    server.add_insecure_port(f'127.0.0.1:{grpc_port}')
+    await server.start()
+
+    logger.info(
+        'Starting ITK v10 Agent on HTTP port %s and gRPC port %s',
+        http_port,
+        grpc_port,
+    )
+
+    config = uvicorn.Config(
+        app, host='127.0.0.1', port=http_port, log_level='info'
+    )
+    uvicorn_server = uvicorn.Server(config)
+
+    await uvicorn_server.serve()
+
+
+def str2bool(v: str | bool) -> bool:
+    """Converts a string to a boolean value."""
+    if isinstance(v, bool):
+        return v
+    if v.lower() in ('yes', 'true', 't', 'y', '1'):
+        return True
+    if v.lower() in ('no', 'false', 'f', 'n', '0'):
+        return False
+    raise argparse.ArgumentTypeError('Boolean value expected.')
+
+
+def main() -> None:
+    """Main entry point for the agent."""
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--httpPort', type=int, default=10102)
+    parser.add_argument('--grpcPort', type=int, default=11002)
+    args = parser.parse_args()
+
+    asyncio.run(main_async(args.httpPort, args.grpcPort))
+
+
+if __name__ == '__main__':
+    main()