364 lines
12 KiB
Python
364 lines
12 KiB
Python
"""
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Streaming messages for WebSocket connections.
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"""
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import asyncio
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import structlog
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from fastapi import WebSocket, WebSocketDisconnect
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from websockets.exceptions import ConnectionClosedError
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import skyvern.forge.sdk.routes.streaming_clients as sc
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from skyvern.forge.sdk.routes.routers import base_router, legacy_base_router
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from skyvern.forge.sdk.routes.streaming_agent import connected_agent
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from skyvern.forge.sdk.routes.streaming_auth import auth
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from skyvern.forge.sdk.routes.streaming_verify import (
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loop_verify_browser_session,
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loop_verify_workflow_run,
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verify_browser_session,
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verify_workflow_run,
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)
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from skyvern.forge.sdk.utils.aio import collect
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LOG = structlog.get_logger()
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async def get_messages_for_browser_session(
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client_id: str,
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browser_session_id: str,
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organization_id: str,
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websocket: WebSocket,
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) -> tuple[sc.MessageChannel, sc.Loops] | None:
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"""
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Return a message channel for a browser session, with a list of loops to run concurrently.
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"""
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LOG.info("Getting message channel for browser session.", browser_session_id=browser_session_id)
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browser_session = await verify_browser_session(
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browser_session_id=browser_session_id,
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organization_id=organization_id,
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)
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if not browser_session:
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LOG.info(
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"Message channel: no initial browser session found.",
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browser_session_id=browser_session_id,
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organization_id=organization_id,
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)
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return None
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message_channel = sc.MessageChannel(
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client_id=client_id,
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organization_id=organization_id,
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browser_session=browser_session,
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websocket=websocket,
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)
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LOG.info("Got message channel for browser session.", message_channel=message_channel)
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loops = [
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asyncio.create_task(loop_verify_browser_session(message_channel)),
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asyncio.create_task(loop_channel(message_channel)),
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]
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return message_channel, loops
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async def get_messages_for_workflow_run(
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client_id: str,
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workflow_run_id: str,
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organization_id: str,
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websocket: WebSocket,
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) -> tuple[sc.MessageChannel, sc.Loops] | None:
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"""
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Return a message channel for a workflow run, with a list of loops to run concurrently.
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"""
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LOG.info("Getting message channel for workflow run.", workflow_run_id=workflow_run_id)
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workflow_run, browser_session = await verify_workflow_run(
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workflow_run_id=workflow_run_id,
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organization_id=organization_id,
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)
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if not workflow_run:
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LOG.info(
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"Message channel: no initial workflow run found.",
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workflow_run_id=workflow_run_id,
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organization_id=organization_id,
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)
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return None
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if not browser_session:
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LOG.info(
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"Message channel: no initial browser session found for workflow run.",
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workflow_run_id=workflow_run_id,
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organization_id=organization_id,
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)
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return None
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message_channel = sc.MessageChannel(
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client_id=client_id,
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organization_id=organization_id,
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browser_session=browser_session,
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workflow_run=workflow_run,
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websocket=websocket,
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)
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LOG.info("Got message channel for workflow run.", message_channel=message_channel)
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loops = [
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asyncio.create_task(loop_verify_workflow_run(message_channel)),
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asyncio.create_task(loop_channel(message_channel)),
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]
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return message_channel, loops
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async def loop_channel(message_channel: sc.MessageChannel) -> None:
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"""
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Stream messages and their results back and forth.
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Loops until the workflow run is cleared or the websocket is closed.
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"""
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if not message_channel.browser_session:
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LOG.info(
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"No browser session found for workflow run.",
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workflow_run=message_channel.workflow_run,
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organization_id=message_channel.organization_id,
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)
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return
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async def frontend_to_backend() -> None:
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LOG.info("Starting frontend-to-backend channel loop.", message_channel=message_channel)
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while message_channel.is_open:
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try:
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data = await message_channel.websocket.receive_json()
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if not isinstance(data, dict):
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LOG.error(f"Cannot create channel message: expected dict, got {type(data)}")
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continue
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try:
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message = sc.reify_channel_message(data)
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except ValueError:
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continue
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message_kind = message.kind
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match message_kind:
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case "take-control":
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streaming = sc.get_streaming_client(message_channel.client_id)
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if not streaming:
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LOG.error(
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"No streaming client found for message.",
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message_channel=message_channel,
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message=message,
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)
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continue
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streaming.interactor = "user"
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case "cede-control":
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streaming = sc.get_streaming_client(message_channel.client_id)
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if not streaming:
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LOG.error(
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"No streaming client found for message.",
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message_channel=message_channel,
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message=message,
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)
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continue
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streaming.interactor = "agent"
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case "ask-for-clipboard-response":
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if not isinstance(message, sc.MessageInAskForClipboardResponse):
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LOG.error(
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"Invalid message type for ask-for-clipboard-response.",
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message_channel=message_channel,
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message=message,
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)
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continue
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streaming = sc.get_streaming_client(message_channel.client_id)
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text = message.text
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async with connected_agent(streaming) as agent:
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await agent.paste_text(text)
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case _:
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LOG.error(f"Unknown message kind: '{message_kind}'")
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continue
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except WebSocketDisconnect:
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LOG.info(
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"Frontend disconnected.",
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workflow_run=message_channel.workflow_run,
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organization_id=message_channel.organization_id,
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)
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raise
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except ConnectionClosedError:
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LOG.info(
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"Frontend closed the streaming session.",
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workflow_run=message_channel.workflow_run,
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organization_id=message_channel.organization_id,
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)
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raise
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except asyncio.CancelledError:
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pass
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except Exception:
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LOG.exception(
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"An unexpected exception occurred.",
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workflow_run=message_channel.workflow_run,
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organization_id=message_channel.organization_id,
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)
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raise
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loops = [
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asyncio.create_task(frontend_to_backend()),
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]
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try:
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await collect(loops)
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except Exception:
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LOG.exception(
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"An exception occurred in loop channel stream.",
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workflow_run=message_channel.workflow_run,
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organization_id=message_channel.organization_id,
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)
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finally:
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LOG.info(
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"Closing the loop channel stream.",
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workflow_run=message_channel.workflow_run,
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organization_id=message_channel.organization_id,
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)
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await message_channel.close(reason="loop-channel-closed")
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@base_router.websocket("/stream/messages/browser_session/{browser_session_id}")
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@base_router.websocket("/stream/commands/browser_session/{browser_session_id}")
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async def browser_session_messages(
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websocket: WebSocket,
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browser_session_id: str,
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apikey: str | None = None,
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client_id: str | None = None,
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token: str | None = None,
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) -> None:
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LOG.info("Starting message stream for browser session.", browser_session_id=browser_session_id)
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organization_id = await auth(apikey=apikey, token=token, websocket=websocket)
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if not organization_id:
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LOG.error("Authentication failed.", browser_session_id=browser_session_id)
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return
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if not client_id:
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LOG.error("No client ID provided.", browser_session_id=browser_session_id)
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return
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message_channel: sc.MessageChannel
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loops: list[asyncio.Task] = []
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result = await get_messages_for_browser_session(
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client_id=client_id,
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browser_session_id=browser_session_id,
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organization_id=organization_id,
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websocket=websocket,
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)
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if not result:
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LOG.error(
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"No streaming context found for the browser session.",
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browser_session_id=browser_session_id,
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organization_id=organization_id,
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)
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await websocket.close(code=1013)
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return
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message_channel, loops = result
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try:
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LOG.info(
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"Starting message stream loops for browser session.",
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browser_session_id=browser_session_id,
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organization_id=organization_id,
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)
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await collect(loops)
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except Exception:
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LOG.exception(
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"An exception occurred in the message stream function for browser session.",
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browser_session_id=browser_session_id,
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organization_id=organization_id,
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)
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finally:
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LOG.info(
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"Closing the message stream session for browser session.",
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browser_session_id=browser_session_id,
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organization_id=organization_id,
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)
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await message_channel.close(reason="stream-closed")
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@legacy_base_router.websocket("/stream/messages/workflow_run/{workflow_run_id}")
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@legacy_base_router.websocket("/stream/commands/workflow_run/{workflow_run_id}")
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async def workflow_run_messages(
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websocket: WebSocket,
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workflow_run_id: str,
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apikey: str | None = None,
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client_id: str | None = None,
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token: str | None = None,
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) -> None:
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LOG.info("Starting message stream.", workflow_run_id=workflow_run_id)
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organization_id = await auth(apikey=apikey, token=token, websocket=websocket)
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if not organization_id:
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LOG.error("Authentication failed.", workflow_run_id=workflow_run_id)
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return
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if not client_id:
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LOG.error("No client ID provided.", workflow_run_id=workflow_run_id)
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return
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message_channel: sc.MessageChannel
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loops: list[asyncio.Task] = []
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result = await get_messages_for_workflow_run(
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client_id=client_id,
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workflow_run_id=workflow_run_id,
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organization_id=organization_id,
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websocket=websocket,
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)
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if not result:
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LOG.error(
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"No streaming context found for the workflow run.",
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workflow_run_id=workflow_run_id,
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organization_id=organization_id,
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)
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await websocket.close(code=1013)
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return
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message_channel, loops = result
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try:
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LOG.info(
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"Starting message stream loops.",
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workflow_run_id=workflow_run_id,
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organization_id=organization_id,
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)
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await collect(loops)
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except Exception:
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LOG.exception(
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"An exception occurred in the message stream function.",
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workflow_run_id=workflow_run_id,
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organization_id=organization_id,
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)
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finally:
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LOG.info(
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"Closing the message stream session.",
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workflow_run_id=workflow_run_id,
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organization_id=organization_id,
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)
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await message_channel.close(reason="stream-closed")
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