54eefba6f8
## 问题 商品搜索时工具名丢失，导致 404 错误： ``` HTTP Request: POST http://product_mcp:8004/tools/ "HTTP/1.1 404 Not Found" ``` URL 应该是 `/tools/search_products` 但实际是 `/tools/`（工具名丢失） ## 根本原因 当 LLM 返回带 ```json``` 代码块格式的 JSON 时： ``` ```json { "action": "call_tool", "tool_name": "search_products", "arguments": {"keyword": "ring"} } ``` ``` 解析逻辑处理后： 1. 移除 ```` → 得到 `json\n{\n...` 2. 移除 `json` → 得到 `\n{\n...` 3. 内容以换行符开头，不是 `{` 4. 被误判为非 JSON 格式（`tool_name\n{args}`） 5. 按换行符分割，第一行为空 → `tool_name = ""` ## 解决方案 **第 189 行**：添加 `content.strip()` 去除前后空白 ```python if content.startswith("```"): content = content.split("```")[1] if content.startswith("json"): content = content[4:] # Remove leading/trailing whitespace after removing code block markers content = content.strip() # ← 新增 ``` ## 额外改进 **第 217-224 行**：添加工具调用日志 ```python logger.info( "Product agent calling tool", tool_name=tool_name, arguments=arguments, conversation_id=state["conversation_id"] ) ``` 便于调试工具调用问题。 ## 测试验证 修复前： ``` tool_name = "" (空字符串) URL: /tools/ (缺少工具名) ``` 修复后： ``` tool_name = "search_products" (正确) URL: /tools/search_products (完整路径) ``` Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
394 lines
13 KiB
Python
394 lines
13 KiB
Python
"""
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Product Agent - Handles product search, recommendations, and quotes
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"""
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import json
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from typing import Any
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from core.state import AgentState, ConversationState, add_tool_call, set_response, update_context
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from core.llm import get_llm_client, Message
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from utils.logger import get_logger
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logger = get_logger(__name__)
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PRODUCT_AGENT_PROMPT = """你是一个专业的 B2B 商品顾问助手。
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你的职责是帮助用户找到合适的商品，包括：
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- 商品搜索
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- 智能推荐
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- B2B 询价
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- 库存查询
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- 商品详情
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## 可用工具
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1. **search_products** - 搜索商品
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- keyword: 搜索关键词（商品名称、编号等）
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- page_size: 每页数量（默认 60，最大 100）
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- page: 页码（默认 1）
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- 说明：此工具使用 Mall API 搜索商品 SPU，支持用户 token 认证，返回卡片格式展示
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2. **get_product_detail** - 获取商品详情
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- product_id: 商品ID
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3. **recommend_products** - 智能推荐
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- context: 推荐上下文（可包含当前查询、浏览历史等）
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- limit: 推荐数量
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4. **get_quote** - B2B 询价
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- product_id: 商品ID
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- quantity: 采购数量
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- delivery_address: 收货地址（可选，用于计算运费）
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5. **check_inventory** - 库存查询
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- product_ids: 商品ID列表
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- warehouse: 仓库（可选）
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## 工具调用格式
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当需要使用工具时，请返回 JSON 格式：
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```json
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{
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"action": "call_tool",
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"tool_name": "工具名称",
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"arguments": {
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"参数名": "参数值"
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}
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}
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```
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**示例**：
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用户说："搜索 ring"
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返回：
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```json
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{
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"action": "call_tool",
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"tool_name": "search_products",
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"arguments": {
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"keyword": "ring"
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}
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}
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```
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用户说："查找手机"
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返回：
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```json
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{
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"action": "call_tool",
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"tool_name": "search_products",
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"arguments": {
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"keyword": "手机"
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}
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}
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```
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当需要向用户询问更多信息时：
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```json
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{
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"action": "ask_info",
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"question": "需要询问的问题"
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}
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```
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当可以直接回答时：
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```json
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{
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"action": "respond",
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"response": "回复内容"
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}
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```
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## B2B 询价特点
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- 大批量采购通常有阶梯价格
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- 可能需要考虑运费
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- 企业客户可能有专属折扣
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- 报价通常有有效期
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## 商品推荐策略
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- 根据用户采购历史推荐
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- 根据当前查询语义推荐
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- 根据企业行业特点推荐
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- 根据季节性和热门商品推荐
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## 注意事项
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- 帮助用户准确描述需求
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- 如果搜索结果太多，建议用户缩小范围
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- 询价时确认数量，因为会影响价格
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- 库存紧张时及时告知用户
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"""
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async def product_agent(state: AgentState) -> AgentState:
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"""Product agent node
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Handles product search, recommendations, quotes and inventory queries.
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Args:
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state: Current agent state
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Returns:
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Updated state with tool calls or response
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"""
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logger.info(
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"Product agent processing",
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conversation_id=state["conversation_id"],
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sub_intent=state.get("sub_intent")
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)
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state["current_agent"] = "product"
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state["agent_history"].append("product")
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state["state"] = ConversationState.PROCESSING.value
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# Check if we have tool results to process
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if state["tool_results"]:
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return await _generate_product_response(state)
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# Build messages for LLM
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messages = [
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Message(role="system", content=PRODUCT_AGENT_PROMPT),
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]
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# Add conversation history
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for msg in state["messages"][-6:]:
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messages.append(Message(role=msg["role"], content=msg["content"]))
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# Build context info
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context_info = f"用户ID: {state['user_id']}\n账户ID: {state['account_id']}\n"
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if state["entities"]:
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context_info += f"已提取的信息: {json.dumps(state['entities'], ensure_ascii=False)}\n"
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if state["context"].get("product_id"):
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context_info += f"当前讨论的商品ID: {state['context']['product_id']}\n"
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if state["context"].get("recent_searches"):
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context_info += f"最近搜索: {state['context']['recent_searches']}\n"
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user_content = f"{context_info}\n用户消息: {state['current_message']}"
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messages.append(Message(role="user", content=user_content))
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try:
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llm = get_llm_client()
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response = await llm.chat(messages, temperature=0.7)
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# Parse response
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content = response.content.strip()
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# Log raw LLM response for debugging
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logger.info(
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"Product agent LLM response",
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response_length=len(content),
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response_preview=content[:200],
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conversation_id=state["conversation_id"]
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)
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if content.startswith("```"):
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content = content.split("```")[1]
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if content.startswith("json"):
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content = content[4:]
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# Remove leading/trailing whitespace after removing code block markers
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content = content.strip()
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# Handle non-JSON format: "tool_name\n{args}"
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if '\n' in content and not content.startswith('{'):
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lines = content.split('\n', 1)
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tool_name = lines[0].strip()
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args_json = lines[1].strip() if len(lines) > 1 else '{}'
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try:
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arguments = json.loads(args_json) if args_json else {}
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result = {
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"action": "call_tool",
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"tool_name": tool_name,
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"arguments": arguments
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}
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except json.JSONDecodeError:
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# If args parsing fails, use empty dict
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result = {
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"action": "call_tool",
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"tool_name": tool_name,
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"arguments": {}
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}
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else:
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# Standard JSON format
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result = json.loads(content)
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action = result.get("action")
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if action == "call_tool":
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arguments = result.get("arguments", {})
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tool_name = result.get("tool_name", "")
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logger.info(
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"Product agent calling tool",
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tool_name=tool_name,
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arguments=arguments,
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conversation_id=state["conversation_id"]
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)
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# Inject context for product search (Mall API)
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if tool_name == "search_products":
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arguments["user_token"] = state.get("user_token")
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arguments["user_id"] = state["user_id"]
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arguments["account_id"] = state["account_id"]
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# Map "query" parameter to "keyword" for compatibility
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if "query" in arguments and "keyword" not in arguments:
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arguments["keyword"] = arguments.pop("query")
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logger.info(
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"Parameter mapped: query -> keyword",
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conversation_id=state["conversation_id"]
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)
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# Inject context for recommendation
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if tool_name == "recommend_products":
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arguments["user_id"] = state["user_id"]
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arguments["account_id"] = state["account_id"]
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# Inject context for quote
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if tool_name == "get_quote":
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arguments["account_id"] = state["account_id"]
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# Use entity if available
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if "product_id" not in arguments and state["entities"].get("product_id"):
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arguments["product_id"] = state["entities"]["product_id"]
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if "quantity" not in arguments and state["entities"].get("quantity"):
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arguments["quantity"] = state["entities"]["quantity"]
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state = add_tool_call(
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state,
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tool_name=tool_name,
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arguments=arguments,
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server="product"
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)
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state["state"] = ConversationState.TOOL_CALLING.value
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elif action == "ask_info":
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state = set_response(state, result["question"])
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state["state"] = ConversationState.AWAITING_INFO.value
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elif action == "respond":
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state = set_response(state, result["response"])
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state["state"] = ConversationState.GENERATING.value
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return state
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except json.JSONDecodeError:
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state = set_response(state, response.content)
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return state
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except Exception as e:
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logger.error("Product agent failed", error=str(e))
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state["error"] = str(e)
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return state
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async def _generate_product_response(state: AgentState) -> AgentState:
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"""Generate response based on product tool results"""
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# 特殊处理：如果是 search_products 工具返回，直接发送商品卡片
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has_product_search_result = False
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products = []
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for result in state["tool_results"]:
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if result["success"] and result["tool_name"] == "search_products":
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data = result["data"]
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if isinstance(data, dict) and data.get("success"):
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products = data.get("products", [])
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has_product_search_result = True
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logger.info(
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"Product search results found",
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products_count=len(products),
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keyword=data.get("keyword", "")
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)
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break
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# 如果有商品搜索结果，直接发送商品卡片
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if has_product_search_result and products:
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try:
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from integrations.chatwoot import ChatwootClient
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from core.language_detector import detect_language
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# 检测语言
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detected_language = state.get("detected_language", "en")
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# 发送商品卡片
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chatwoot = ChatwootClient(account_id=int(state.get("account_id", 1)))
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conversation_id = state.get("conversation_id")
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if conversation_id:
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await chatwoot.send_product_cards(
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conversation_id=int(conversation_id),
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products=products,
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language=detected_language
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)
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logger.info(
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"Product cards sent successfully",
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conversation_id=conversation_id,
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products_count=len(products),
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language=detected_language
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)
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# 清空响应，避免重复发送
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state = set_response(state, "")
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state["state"] = ConversationState.GENERATING.value
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return state
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except Exception as e:
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logger.error(
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"Failed to send product cards, falling back to text response",
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error=str(e),
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products_count=len(products)
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)
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# 常规处理：生成文本响应
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tool_context = []
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for result in state["tool_results"]:
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if result["success"]:
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data = result["data"]
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tool_context.append(f"工具 {result['tool_name']} 返回:\n{json.dumps(data, ensure_ascii=False, indent=2)}")
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# Extract product context
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if isinstance(data, dict):
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if data.get("product_id"):
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state = update_context(state, {"product_id": data["product_id"]})
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if data.get("products"):
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# Store recent search results
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product_ids = [p.get("product_id") for p in data["products"][:5]]
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state = update_context(state, {"recent_product_ids": product_ids})
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else:
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tool_context.append(f"工具 {result['tool_name']} 执行失败: {result['error']}")
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prompt = f"""基于以下商品系统返回的信息，生成对用户的回复。
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用户问题: {state["current_message"]}
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系统返回信息:
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{chr(10).join(tool_context)}
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请生成一个清晰、有帮助的回复：
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- 如果是搜索结果，展示商品名称、价格、规格等关键信息
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- 如果是询价结果，清晰说明单价、总价、折扣、有效期等
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- 如果是推荐商品，简要说明推荐理由
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- 如果是库存查询，告知可用数量和发货时间
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- 结果较多时可以总结关键信息
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只返回回复内容，不要返回 JSON。"""
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messages = [
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Message(role="system", content="你是一个专业的商品顾问，请根据系统返回的信息回答用户的商品问题。"),
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Message(role="user", content=prompt)
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]
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try:
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llm = get_llm_client()
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response = await llm.chat(messages, temperature=0.7)
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state = set_response(state, response.content)
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return state
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except Exception as e:
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logger.error("Product response generation failed", error=str(e))
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state = set_response(state, "抱歉，处理商品信息时遇到问题。请稍后重试或联系人工客服。")
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return state
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