ailine/backend/app/main_graph/nodes/web_search.py

"""
联网搜索节点 - 执行搜索并将结果保存到状态
"""

from typing import Optional
from datetime import datetime
from langchain_core.runnables.config import RunnableConfig

from ...main_graph.state import MainGraphState, ErrorRecord, ErrorSeverity
from backend.app.logger import info


async def web_search_node(state: MainGraphState, config: Optional[RunnableConfig] = None) -> MainGraphState:
    """
    联网搜索节点：执行搜索并将结果保存到状态
    """
    state.current_phase = "web_searching"

    # 发送开始事件
    if config:
        try:
            from langchain_core.callbacks.manager import adispatch_custom_event
            callbacks = config.get("callbacks")
            if callbacks:
                await adispatch_custom_event(
                    "react_reasoning",
                    {
                        "step": state.reasoning_step,
                        "action": "web_search_start",
                        "confidence": 1.0,
                        "reasoning": "开始执行联网搜索..."
                    },
                    callbacks=callbacks
                )
        except Exception as e:
            info(f"[web_search_node] 无法发送开始事件: {e}")

    # 获取搜索查询
    reasoning_result = state.debug_info.get("reasoning_result")
    search_query = reasoning_result.metadata.get("search_query", state.user_query) if reasoning_result else state.user_query

    try:
        from backend.app.core import web_search

        print(f"[WebSearch] 搜索: {search_query}")
        search_result = web_search(search_query, max_results=5)

        # 保存搜索结果到状态
        if not hasattr(state, "web_search_results"):
            state.web_search_results = []
        state.web_search_results.append(search_result)

        # 将搜索结果添加到 rag_context，供 LLM 使用
        if state.rag_context:
            state.rag_context = f"{state.rag_context}\n\n---\n\n## 🌐 联网搜索结果:\n{search_result}"
        else:
            state.rag_context = f"## 🌐 联网搜索结果:\n{search_result}"

        state.success = True
        print(f"[WebSearch] 搜索完成")

        # 发送完成事件
        if config:
            try:
                from langchain_core.callbacks.manager import adispatch_custom_event
                callbacks = config.get("callbacks")
                if callbacks:
                    await adispatch_custom_event(
                        "react_reasoning",
                        {
                            "step": state.reasoning_step,
                            "action": "web_search_complete",
                            "confidence": 1.0,
                            "reasoning": f"联网搜索完成，找到 {len(search_result) if isinstance(search_result, list) else 1} 条结果"
                        },
                        callbacks=callbacks
                    )
            except Exception as e:
                info(f"[web_search_node] 无法发送完成事件: {e}")

    except Exception as e:
        error_record = ErrorRecord(
            error_type="WebSearchError",
            error_message=str(e),
            severity=ErrorSeverity.WARNING,
            source="web_search_node",
            timestamp=datetime.now().isoformat(),
            retry_count=0,
            max_retries=2,
            context={"search_query": search_query}
        )
        state.errors.append(error_record)
        state.current_error = error_record
        state.current_phase = "error_handling"
        state.success = False

        # 发送错误事件
        if config:
            try:
                from langchain_core.callbacks.manager import adispatch_custom_event
                callbacks = config.get("callbacks")
                if callbacks:
                    await adispatch_custom_event(
                        "react_reasoning",
                        {
                            "step": state.reasoning_step,
                            "action": "web_search_error",
                            "confidence": 1.0,
                            "reasoning": f"联网搜索失败: {str(e)}"
                        },
                        callbacks=callbacks
                    )
            except Exception as e:
                info(f"[web_search_node] 无法发送错误事件: {e}")

    return state