mirror of
https://github.com/Sea-Haven-Industries/open-swe.git
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100 lines
3.3 KiB
Python
100 lines
3.3 KiB
Python
"""Shared LangGraph thread helpers for webhooks and the dashboard."""
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from __future__ import annotations
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import asyncio
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import logging
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import os
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from collections.abc import AsyncIterator
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from contextlib import asynccontextmanager
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from typing import Any
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from langgraph_sdk import get_client
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logger = logging.getLogger(__name__)
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MAX_QUEUED_MESSAGES = 100
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_THREAD_RUN_LOCKS: dict[str, asyncio.Lock] = {}
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def get_thread_run_lock(thread_id: str) -> asyncio.Lock:
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"""Return a per-thread-id asyncio.Lock, creating one lazily if needed."""
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lock = _THREAD_RUN_LOCKS.get(thread_id)
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if lock is None:
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lock = asyncio.Lock()
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_THREAD_RUN_LOCKS[thread_id] = lock
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return lock
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@asynccontextmanager
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async def thread_run_lock(thread_id: str) -> AsyncIterator[None]:
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"""Serialize run dispatch for a thread."""
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lock = get_thread_run_lock(thread_id)
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async with lock:
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yield
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def langgraph_url() -> str:
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return os.environ.get("LANGGRAPH_URL") or os.environ.get(
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"LANGGRAPH_URL_PROD", "http://localhost:2024"
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)
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def langgraph_client():
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return get_client(url=langgraph_url())
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async def get_thread_active_status(thread_id: str) -> bool | None:
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"""Return whether the thread is active, or None when status cannot be determined."""
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try:
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thread = await langgraph_client().threads.get(thread_id)
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status = thread.get("status", "idle") if isinstance(thread, dict) else "idle"
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logger.info("Thread %s status check: status=%s", thread_id, status)
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return status == "busy"
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except Exception as exc: # noqa: BLE001
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logger.warning("Failed to get thread status for %s: %s", thread_id, exc)
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return None
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async def is_thread_active(thread_id: str) -> bool:
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"""Return whether the thread currently has a running run."""
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return await get_thread_active_status(thread_id) is True
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async def queue_message_for_thread(
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thread_id: str, message_content: str | list[dict[str, Any]] | dict[str, Any]
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) -> bool:
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"""Queue a follow-up message for a busy thread (FIFO store namespace)."""
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client = langgraph_client()
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try:
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namespace = ("queue", thread_id)
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key = "pending_messages"
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new_message = {"content": message_content}
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existing_messages: list[dict[str, Any]] = []
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try:
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existing_item = await client.store.get_item(namespace, key)
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if existing_item and existing_item.get("value"):
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existing_messages = existing_item["value"].get("messages", [])
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except Exception: # noqa: BLE001
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logger.debug("No existing queued messages for thread %s", thread_id)
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existing_messages.append(new_message)
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if len(existing_messages) > MAX_QUEUED_MESSAGES:
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existing_messages = existing_messages[-MAX_QUEUED_MESSAGES:]
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logger.warning(
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"Thread %s queue capped at %d messages (dropped oldest)",
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thread_id,
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MAX_QUEUED_MESSAGES,
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)
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await client.store.put_item(namespace, key, {"messages": existing_messages})
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logger.info(
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"Queued message for thread %s (total queued: %d)",
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thread_id,
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len(existing_messages),
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)
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return True
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except Exception:
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logger.exception("Failed to queue message for thread %s", thread_id)
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return False
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