121 lines
4.5 KiB
Python
121 lines
4.5 KiB
Python
from starlette.applications import Starlette
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from starlette.responses import JSONResponse
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from sse_starlette.sse import EventSourceResponse
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from starlette.requests import Request
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from common.types import (
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A2ARequest,
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JSONRPCResponse,
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InvalidRequestError,
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JSONParseError,
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GetTaskRequest,
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CancelTaskRequest,
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SendTaskRequest,
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SetTaskPushNotificationRequest,
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GetTaskPushNotificationRequest,
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InternalError,
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AgentCard,
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TaskResubscriptionRequest,
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SendTaskStreamingRequest,
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)
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from pydantic import ValidationError
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import json
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from typing import AsyncIterable, Any
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from common.server.task_manager import TaskManager
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import logging
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logger = logging.getLogger(__name__)
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class A2AServer:
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def __init__(
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self,
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host="0.0.0.0",
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port=5000,
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endpoint="/",
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agent_card: AgentCard = None,
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task_manager: TaskManager = None,
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):
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self.host = host
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self.port = port
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self.endpoint = endpoint
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self.task_manager = task_manager
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self.agent_card = agent_card
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self.app = Starlette()
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self.app.add_route(self.endpoint, self._process_request, methods=["POST"])
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self.app.add_route(
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"/.well-known/agent.json", self._get_agent_card, methods=["GET"]
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)
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def start(self):
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if self.agent_card is None:
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raise ValueError("agent_card is not defined")
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if self.task_manager is None:
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raise ValueError("request_handler is not defined")
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import uvicorn
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uvicorn.run(self.app, host=self.host, port=self.port)
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def _get_agent_card(self, request: Request) -> JSONResponse:
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return JSONResponse(self.agent_card.model_dump(exclude_none=True))
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async def _process_request(self, request: Request):
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try:
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body = await request.json()
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json_rpc_request = A2ARequest.validate_python(body)
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if isinstance(json_rpc_request, GetTaskRequest):
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result = await self.task_manager.on_get_task(json_rpc_request)
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elif isinstance(json_rpc_request, SendTaskRequest):
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result = await self.task_manager.on_send_task(json_rpc_request)
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elif isinstance(json_rpc_request, SendTaskStreamingRequest):
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result = await self.task_manager.on_send_task_subscribe(
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json_rpc_request
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)
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elif isinstance(json_rpc_request, CancelTaskRequest):
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result = await self.task_manager.on_cancel_task(json_rpc_request)
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elif isinstance(json_rpc_request, SetTaskPushNotificationRequest):
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result = await self.task_manager.on_set_task_push_notification(json_rpc_request)
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elif isinstance(json_rpc_request, GetTaskPushNotificationRequest):
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result = await self.task_manager.on_get_task_push_notification(json_rpc_request)
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elif isinstance(json_rpc_request, TaskResubscriptionRequest):
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result = await self.task_manager.on_resubscribe_to_task(
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json_rpc_request
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)
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else:
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logger.warning(f"Unexpected request type: {type(json_rpc_request)}")
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raise ValueError(f"Unexpected request type: {type(request)}")
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return self._create_response(result)
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except Exception as e:
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return self._handle_exception(e)
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def _handle_exception(self, e: Exception) -> JSONResponse:
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if isinstance(e, json.decoder.JSONDecodeError):
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json_rpc_error = JSONParseError()
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elif isinstance(e, ValidationError):
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json_rpc_error = InvalidRequestError(data=json.loads(e.json()))
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else:
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logger.error(f"Unhandled exception: {e}")
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json_rpc_error = InternalError()
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response = JSONRPCResponse(id=None, error=json_rpc_error)
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return JSONResponse(response.model_dump(exclude_none=True), status_code=400)
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def _create_response(self, result: Any) -> JSONResponse | EventSourceResponse:
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if isinstance(result, AsyncIterable):
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async def event_generator(result) -> AsyncIterable[dict[str, str]]:
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async for item in result:
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yield {"data": item.model_dump_json(exclude_none=True)}
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return EventSourceResponse(event_generator(result))
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elif isinstance(result, JSONRPCResponse):
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return JSONResponse(result.model_dump(exclude_none=True))
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else:
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logger.error(f"Unexpected result type: {type(result)}")
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raise ValueError(f"Unexpected result type: {type(result)}")
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