254 lines
9.9 KiB
Python
254 lines
9.9 KiB
Python
import asyncio
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import logging
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from typing import Dict, Optional, Callable, Awaitable, Any
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from datetime import datetime
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from gateway.channels.base import Channel
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from gateway.user_session import UserSession
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from gateway.protocol import UserMessage, AgentMessage
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logger = logging.getLogger(__name__)
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class Gateway:
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"""Central hub for routing messages between users, channels, and the agent.
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The Gateway:
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- Maintains active channels and user sessions
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- Routes user messages to the agent
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- Routes agent responses back to appropriate channels
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- Handles interruption of in-flight agent tasks
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"""
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def __init__(self):
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self.channels: Dict[str, Channel] = {}
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self.sessions: Dict[str, UserSession] = {}
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self.agent_executor: Optional[Callable[[UserSession, UserMessage], Awaitable[AsyncIterator[str]]]] = None
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def set_agent_executor(
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self,
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executor: Callable[[UserSession, UserMessage], Awaitable[Any]]
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) -> None:
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"""Set the agent executor function.
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Args:
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executor: Async function that takes (session, message) and returns async iterator of response chunks
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"""
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self.agent_executor = executor
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def register_channel(self, channel: Channel) -> None:
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"""Register a new communication channel.
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Args:
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channel: Channel instance to register
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"""
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self.channels[channel.channel_id] = channel
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def unregister_channel(self, channel_id: str) -> None:
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"""Unregister a channel.
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Args:
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channel_id: ID of channel to remove
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"""
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if channel_id in self.channels:
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# Remove channel from any sessions
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for session in self.sessions.values():
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session.remove_channel(channel_id)
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del self.channels[channel_id]
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def get_or_create_session(self, session_id: str, user_id: str) -> UserSession:
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"""Get existing session or create a new one.
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Args:
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session_id: Unique session identifier
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user_id: User identifier
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Returns:
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UserSession instance
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"""
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if session_id not in self.sessions:
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self.sessions[session_id] = UserSession(session_id, user_id)
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return self.sessions[session_id]
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async def route_user_message(self, message: UserMessage) -> None:
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"""Route a user message to the agent.
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If the agent is currently processing a message, it will be interrupted
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and restarted with the new message appended to the conversation.
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Args:
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message: UserMessage from a channel
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"""
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logger.info(f"route_user_message called - session: {message.session_id}, channel: {message.channel_id}")
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# Get or create session
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session = self.get_or_create_session(message.session_id, message.session_id)
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logger.info(f"Session obtained/created: {message.session_id}, channels: {session.active_channels}")
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# Ensure channel is attached to session
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session.add_channel(message.channel_id)
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logger.info(f"Channel added to session: {message.channel_id}")
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# If agent is busy, interrupt it
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if session.is_busy():
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logger.info(f"Session is busy, interrupting existing task")
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await session.interrupt()
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# Check if this is a stop interrupt (empty message)
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if not message.content.strip() and not message.attachments:
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logger.info("Received stop interrupt (empty message), not starting new agent round")
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return
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# Add user message to history
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session.add_message("user", message.content, message.channel_id)
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logger.info(f"User message added to history, history length: {len(session.get_history())}")
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# Start agent task
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if self.agent_executor:
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logger.info("Starting agent task execution")
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task = asyncio.create_task(
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self._execute_agent_and_stream(session, message)
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)
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session.set_task(task)
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logger.info(f"Agent task created and set on session")
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else:
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logger.error("No agent_executor configured! Cannot process message.")
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# Send error message to user
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error_msg = AgentMessage(
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session_id=session.session_id,
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target_channels=session.active_channels,
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content="Error: Agent system not initialized. Please check that ANTHROPIC_API_KEY is configured.",
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done=True
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)
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await self._send_to_channels(error_msg)
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async def _execute_agent_and_stream(self, session: UserSession, message: UserMessage) -> None:
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"""Execute agent and stream responses back to channels.
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Args:
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session: User session
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message: Triggering user message
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"""
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logger.info(f"_execute_agent_and_stream starting for session {session.session_id}")
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try:
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# Execute agent (returns async generator directly)
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logger.info("Calling agent_executor...")
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response_stream = self.agent_executor(session, message)
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logger.info("Agent executor returned response stream")
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# Stream chunks back to active channels
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full_response = ""
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chunk_count = 0
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accumulated_metadata = {}
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async for chunk in response_stream:
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# Handle dict response with metadata (from agent executor)
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if isinstance(chunk, dict):
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content = chunk.get("content", "")
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metadata = chunk.get("metadata", {})
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# Accumulate metadata (e.g., plot_urls)
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for key, value in metadata.items():
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if key == "plot_urls" and value:
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# Append to existing plot_urls
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if "plot_urls" not in accumulated_metadata:
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accumulated_metadata["plot_urls"] = []
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accumulated_metadata["plot_urls"].extend(value)
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logger.info(f"Accumulated plot_urls: {accumulated_metadata['plot_urls']}")
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else:
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accumulated_metadata[key] = value
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chunk = content
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# Only send non-empty chunks
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if chunk:
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chunk_count += 1
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full_response += chunk
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logger.debug(f"Received chunk #{chunk_count}, length: {len(chunk)}")
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# Send chunk to all active channels with accumulated metadata
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agent_msg = AgentMessage(
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session_id=session.session_id,
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target_channels=session.active_channels,
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content=chunk,
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stream_chunk=True,
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done=False,
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metadata=accumulated_metadata.copy()
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)
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await self._send_to_channels(agent_msg)
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logger.info(f"Agent streaming completed, total chunks: {chunk_count}, response length: {len(full_response)}")
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# Send final done message with all accumulated metadata
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agent_msg = AgentMessage(
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session_id=session.session_id,
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target_channels=session.active_channels,
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content="",
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stream_chunk=True,
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done=True,
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metadata=accumulated_metadata
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)
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await self._send_to_channels(agent_msg)
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logger.info(f"Sent final done message to channels with metadata: {accumulated_metadata}")
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# Add to history
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session.add_message("assistant", full_response)
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logger.info("Assistant response added to history")
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except asyncio.CancelledError:
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# Task was interrupted
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logger.warning(f"Agent task interrupted for session {session.session_id}")
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raise
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except Exception as e:
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logger.error(f"Agent execution error: {e}", exc_info=True)
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# Send error message
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error_msg = AgentMessage(
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session_id=session.session_id,
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target_channels=session.active_channels,
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content=f"Error: {str(e)}",
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done=True
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)
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await self._send_to_channels(error_msg)
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finally:
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session.set_task(None)
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logger.info(f"Agent task completed for session {session.session_id}")
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async def _send_to_channels(self, message: AgentMessage) -> None:
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"""Send message to specified channels.
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Args:
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message: AgentMessage to send
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"""
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logger.debug(f"Sending message to {len(message.target_channels)} channels")
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for channel_id in message.target_channels:
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channel = self.channels.get(channel_id)
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if channel and channel.get_status().connected:
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try:
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await channel.send(message)
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logger.debug(f"Message sent to channel {channel_id}")
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except Exception as e:
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logger.error(f"Error sending to channel {channel_id}: {e}", exc_info=True)
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else:
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logger.warning(f"Channel {channel_id} not found or not connected")
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def get_session_info(self, session_id: str) -> Optional[Dict[str, Any]]:
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"""Get session information.
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Args:
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session_id: Session ID to query
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Returns:
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Session info dict or None if not found
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"""
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session = self.sessions.get(session_id)
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return session.to_dict() if session else None
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def get_active_sessions(self) -> Dict[str, Dict[str, Any]]:
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"""Get all active sessions.
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Returns:
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Dict mapping session_id to session info
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"""
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return {
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sid: session.to_dict()
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for sid, session in self.sessions.items()
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}
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