wehub-resource-sync
198 lines
8.1 KiB
Python
198 lines
8.1 KiB
Python
# Copyright 2025 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import json
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import logging
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from a2a.server.agent_execution import AgentExecutor, RequestContext
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from a2a.server.events import EventQueue
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from a2a.server.tasks import TaskUpdater
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from a2a.types import (
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DataPart,
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Part,
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Task,
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TaskState,
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TextPart,
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UnsupportedOperationError,
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)
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from a2a.utils import (
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new_agent_parts_message,
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new_agent_text_message,
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new_task,
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)
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from a2a.utils.errors import ServerError
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from a2ui.a2ui_extension import create_a2ui_part, try_activate_a2ui_extension
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from agent import RestaurantAgent
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logger = logging.getLogger(__name__)
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class RestaurantAgentExecutor(AgentExecutor):
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"""Restaurant AgentExecutor Example."""
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def __init__(self, base_url: str):
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# Instantiate two agents: one for UI and one for text-only.
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# The appropriate one will be chosen at execution time.
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self.ui_agent = RestaurantAgent(base_url=base_url, use_ui=True)
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self.text_agent = RestaurantAgent(base_url=base_url, use_ui=False)
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async def execute(
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self,
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context: RequestContext,
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event_queue: EventQueue,
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) -> None:
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query = ""
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ui_event_part = None
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action = None
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logger.info(
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f"--- Client requested extensions: {context.requested_extensions} ---"
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)
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use_ui = try_activate_a2ui_extension(context)
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# Determine which agent to use based on whether the a2ui extension is active.
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if use_ui:
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agent = self.ui_agent
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logger.info(
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"--- AGENT_EXECUTOR: A2UI extension is active. Using UI agent. ---"
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)
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else:
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agent = self.text_agent
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logger.info(
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"--- AGENT_EXECUTOR: A2UI extension is not active. Using text agent. ---"
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)
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if context.message and context.message.parts:
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logger.info(
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f"--- AGENT_EXECUTOR: Processing {len(context.message.parts)} message parts ---"
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)
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for i, part in enumerate(context.message.parts):
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if isinstance(part.root, DataPart):
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if "userAction" in part.root.data:
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logger.info(f" Part {i}: Found a2ui UI ClientEvent payload.")
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ui_event_part = part.root.data["userAction"]
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else:
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logger.info(f" Part {i}: DataPart (data: {part.root.data})")
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elif isinstance(part.root, TextPart):
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logger.info(f" Part {i}: TextPart (text: {part.root.text})")
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else:
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logger.info(f" Part {i}: Unknown part type ({type(part.root)})")
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if ui_event_part:
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logger.info(f"Received a2ui ClientEvent: {ui_event_part}")
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action = ui_event_part.get("actionName")
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ctx = ui_event_part.get("context", {})
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if action == "book_restaurant":
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restaurant_name = ctx.get("restaurantName", "Unknown Restaurant")
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address = ctx.get("address", "Address not provided")
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image_url = ctx.get("imageUrl", "")
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query = f"USER_WANTS_TO_BOOK: {restaurant_name}, Address: {address}, ImageURL: {image_url}"
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elif action == "submit_booking":
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restaurant_name = ctx.get("restaurantName", "Unknown Restaurant")
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party_size = ctx.get("partySize", "Unknown Size")
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reservation_time = ctx.get("reservationTime", "Unknown Time")
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dietary_reqs = ctx.get("dietary", "None")
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image_url = ctx.get("imageUrl", "")
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query = f"User submitted a booking for {restaurant_name} for {party_size} people at {reservation_time} with dietary requirements: {dietary_reqs}. The image URL is {image_url}"
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else:
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query = f"User submitted an event: {action} with data: {ctx}"
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else:
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logger.info("No a2ui UI event part found. Falling back to text input.")
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query = context.get_user_input()
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logger.info(f"--- AGENT_EXECUTOR: Final query for LLM: '{query}' ---")
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task = context.current_task
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if not task:
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task = new_task(context.message)
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await event_queue.enqueue_event(task)
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updater = TaskUpdater(event_queue, task.id, task.context_id)
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async for item in agent.stream(query, task.context_id):
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is_task_complete = item["is_task_complete"]
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if not is_task_complete:
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await updater.update_status(
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TaskState.working,
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new_agent_text_message(item["updates"], task.context_id, task.id),
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)
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continue
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final_state = (
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TaskState.completed
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if action == "submit_booking"
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else TaskState.input_required
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)
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content = item["content"]
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final_parts = []
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if "---a2ui_JSON---" in content:
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logger.info("Splitting final response into text and UI parts.")
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text_content, json_string = content.split("---a2ui_JSON---", 1)
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if text_content.strip():
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final_parts.append(Part(root=TextPart(text=text_content.strip())))
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if json_string.strip():
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try:
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json_string_cleaned = (
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json_string.strip().lstrip("```json").rstrip("```").strip()
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)
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# The new protocol sends a stream of JSON objects.
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# For this example, we'll assume they are sent as a list in the final response.
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json_data = json.loads(json_string_cleaned)
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if isinstance(json_data, list):
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logger.info(
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f"Found {len(json_data)} messages. Creating individual DataParts."
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)
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for message in json_data:
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final_parts.append(create_a2ui_part(message))
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else:
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# Handle the case where a single JSON object is returned
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logger.info(
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"Received a single JSON object. Creating a DataPart."
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)
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final_parts.append(create_a2ui_part(json_data))
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except json.JSONDecodeError as e:
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logger.error(f"Failed to parse UI JSON: {e}")
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final_parts.append(Part(root=TextPart(text=json_string)))
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else:
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final_parts.append(Part(root=TextPart(text=content.strip())))
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logger.info("--- FINAL PARTS TO BE SENT ---")
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for i, part in enumerate(final_parts):
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logger.info(f" - Part {i}: Type = {type(part.root)}")
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if isinstance(part.root, TextPart):
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logger.info(f" - Text: {part.root.text[:200]}...")
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elif isinstance(part.root, DataPart):
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logger.info(f" - Data: {str(part.root.data)[:200]}...")
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logger.info("-----------------------------")
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await updater.update_status(
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final_state,
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new_agent_parts_message(final_parts, task.context_id, task.id),
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final=(final_state == TaskState.completed),
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)
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break
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async def cancel(
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self, request: RequestContext, event_queue: EventQueue
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) -> Task | None:
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raise ServerError(error=UnsupportedOperationError())
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