944 lines
14 KiB
Python
944 lines
14 KiB
Python
# Auto-extracted from chat.py during Phase 1 refactor (Strangler Fig).
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# Source of truth: scripts/phase1_extract.py. Do not hand-merge back.
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from fastapi import APIRouter, Depends, HTTPException, Query, Response
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from sqlalchemy.orm import Session
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from sqlalchemy import and_, desc, asc, func
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from pydantic import BaseModel, Field
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from typing import Optional
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import uuid
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from datetime import datetime, timezone, timedelta
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import re
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import json
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import asyncio
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import math
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import httpx
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import os
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import logging
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from ..database import get_db, SessionLocal
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from ..models import (
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User, Conversation, Message, AIModel, ModelProvider, TokenUsageLog,
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KnowledgeBase, KnowledgeDocument, KnowledgeDocumentChunk, EvolutionSkill,
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EvolutionTrajectory, MarketApp, AppPurchase, AppInstallation,
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MCPServer,
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gen_uuid
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)
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from ..auth import get_current_user
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from ..platform_knowledge import get_platform_knowledge
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from ..mcp_client import list_mcp_tools, call_mcp_tool
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from ..middleware.log_service import LogService
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from ..capability_registry import resolve_auto_model
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from app.api.chat_utils import (_extract_text_from_json, _proxy_for_url)
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def _normalize_dify_chat_url(endpoint: str) -> str:
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"""把用户填写的 Dify 地址归一化为 /v1/chat-messages 端点。与 market.py 保持一致。"""
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ep = (endpoint or "").rstrip("/")
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if ep.endswith("/chat-messages"):
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return ep
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if ep.endswith("/v1"):
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return ep + "/chat-messages"
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return ep + "/v1/chat-messages"
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async def _call_dify_agent(endpoint: str, api_key: str, query: str,
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user_id: str, ext_conv_id: str | None) -> tuple:
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"""调用 Dify(新版 Agent) /v1/chat-messages，流式(SSE)解析最终回答。
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新版 Agent API 仅支持 response_mode=streaming(blocking 会 400)。事件流中
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message / agent_message 事件携带增量 answer，累加即为最终回答；每个事件都带
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conversation_id，用于维持多轮上下文。返回 (answer, new_conversation_id)。
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"""
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url = _normalize_dify_chat_url(endpoint)
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headers = {"Authorization": f"Bearer {api_key}", "Content-Type": "application/json"}
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payload = {
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"inputs": {},
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"query": query,
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"user": (user_id or "web-user")[:64],
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"response_mode": "streaming",
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"conversation_id": ext_conv_id or "",
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}
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answer_parts = []
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new_conv_id = ext_conv_id
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err_msg = None
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wf_outputs = None
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# httpx 默认 follow_redirects=False；stream POST 若遇 301/302 会直接返回该状态码。
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# 且 httpx 自动跟随会把 POST 降级为 GET(对 /v1/chat-messages 变 405)。
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# 因此手动跟随 301/302/307/308，保持 POST 与请求体不变(最多 4 跳)。
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async with httpx.AsyncClient(timeout=180, proxy=_proxy_for_url(url), trust_env=False,
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follow_redirects=False) as client:
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cur_url = url
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for _redir in range(4):
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async with client.stream("POST", cur_url, headers=headers, json=payload) as resp:
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if resp.status_code in (301, 302, 307, 308):
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loc = resp.headers.get("location") or resp.headers.get("Location")
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await resp.aclose()
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if not loc:
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raise RuntimeError(f"Dify HTTP {resp.status_code}: 缺少重定向地址")
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# 处理相对地址
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if loc.startswith("/"):
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from urllib.parse import urlsplit, urlunsplit
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p = urlsplit(cur_url)
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loc = urlunsplit((p.scheme, p.netloc, loc, "", ""))
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cur_url = loc
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continue
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if resp.status_code != 200:
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body = (await resp.aread()).decode("utf-8", "replace")
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raise RuntimeError(f"Dify HTTP {resp.status_code}: {body[:300]}")
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async for line in resp.aiter_lines():
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if not line:
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continue
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line = line.strip()
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if not line.startswith("data:"):
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continue
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data_str = line[5:].strip()
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if not data_str or data_str == "[DONE]":
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continue
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try:
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evt = json.loads(data_str)
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except Exception:
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continue
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ev = evt.get("event")
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if evt.get("conversation_id"):
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new_conv_id = evt["conversation_id"]
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data = evt.get("data") or {}
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# 兼容三类 Dify 应用：
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# 1) Chat/Agent 应用: message / agent_message 事件带增量 answer
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# 2) Chatflow/Workflow 应用: text_chunk 事件带 data.text；
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# 结束时 workflow_finished 带 status / outputs / error
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if ev in ("message", "agent_message"):
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answer_parts.append(evt.get("answer", "") or "")
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elif ev == "message_replace":
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# 内容审查替换：以替换后的完整 answer 为准
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answer_parts = [evt.get("answer", "") or ""]
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elif ev == "text_chunk":
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answer_parts.append((data.get("text") or ""))
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elif ev == "node_finished":
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# answer / end 节点的 outputs 可能含最终文本
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if data.get("node_type") in ("answer", "end") and data.get("outputs"):
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wf_outputs = data.get("outputs")
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if data.get("status") == "failed" and data.get("error"):
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err_msg = str(data.get("error"))
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elif ev == "workflow_finished":
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if data.get("status") == "failed":
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err_msg = str(data.get("error") or "Dify 工作流执行失败")
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elif data.get("outputs"):
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wf_outputs = data.get("outputs")
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elif ev == "error":
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err_msg = evt.get("message") or evt.get("code") or "Dify 流式返回错误"
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break
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else:
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raise RuntimeError("Dify 重定向次数过多(>4)，请直接填写重定向后的地址")
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answer = "".join(answer_parts).strip()
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# 流式无增量文本时，尝试从 workflow 结束 outputs 兜底提取
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if not answer and wf_outputs:
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answer = _extract_text_from_json(wf_outputs).strip()
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if not answer and err_msg:
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raise RuntimeError(err_msg)
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return answer, new_conv_id
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async def _call_n8n_agent(endpoint: str, api_key: str, query: str,
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user_id: str, history: list) -> tuple:
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"""调用 n8n 生产 Webhook (POST)。webhook 用 Respond to Webhook 节点返回 JSON，
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尽力从中抽取文本回答。n8n webhook 无平台级会话态，多轮靠我们下发 history。
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返回 (answer, None)。"""
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url = (endpoint or "").strip()
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headers = {"Content-Type": "application/json"}
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if api_key:
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# n8n Header Auth 自定义头名不固定，同时下发常见几种以提高兼容性
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headers["Authorization"] = f"Bearer {api_key}"
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headers["X-N8N-API-KEY"] = api_key
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# 携带多种字段别名，兼容 n8n AI Agent(chatInput) 与自定义工作流
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payload = {
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"query": query,
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"chatInput": query,
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"message": query,
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"input": query,
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"user": (user_id or "web-user")[:64],
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"history": history or [],
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}
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async with httpx.AsyncClient(timeout=180, proxy=_proxy_for_url(url), trust_env=False) as client:
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resp = await client.post(url, headers=headers, json=payload)
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if resp.status_code not in (200, 201):
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raise RuntimeError(f"n8n Webhook HTTP {resp.status_code}: {resp.text[:300]}")
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ctype = resp.headers.get("content-type", "")
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if "application/json" in ctype:
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try:
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answer = _extract_text_from_json(resp.json())
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except Exception:
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answer = resp.text
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else:
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answer = resp.text
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return (answer or "").strip(), None
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async def _call_coze_agent(endpoint: str, api_key: str, query: str,
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user_id: str, ext_conv_id: str | None) -> tuple:
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"""调用扣子(Coze) v3 对话 API：create → 轮询 retrieve → 拉取 message list。
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约定 agent_endpoint 存放 bot_id(纯 id)，或形如
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https://api.coze.cn/v3/chat?bot_id=xxx 的完整地址。默认基址 api.coze.cn。
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返回 (answer, conversation_id)。
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"""
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ep = (endpoint or "").strip()
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from urllib.parse import urlparse, parse_qs
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bot_id = None
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base = "https://api.coze.cn"
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if ep.startswith("http"):
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pr = urlparse(ep)
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base = f"{pr.scheme}://{pr.netloc}"
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qs = parse_qs(pr.query)
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bot_id = (qs.get("bot_id") or [None])[0]
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if not bot_id and "/bot/" in pr.path:
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bot_id = pr.path.rstrip("/").split("/bot/")[-1]
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else:
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bot_id = ep # 纯 bot_id
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if not bot_id:
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raise RuntimeError("Coze 接入缺少 bot_id(请在 Endpoint 填入 bot_id 或带 ?bot_id= 的地址)")
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headers = {"Authorization": f"Bearer {api_key}", "Content-Type": "application/json"}
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|
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create_url = f"{base}/v3/chat"
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if ext_conv_id:
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create_url += f"?conversation_id={ext_conv_id}"
|
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||
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payload = {
|
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||
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"bot_id": bot_id,
|
||
|
||
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"user_id": (user_id or "web-user")[:64],
|
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|
||
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"stream": False,
|
||
|
||
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"auto_save_history": True,
|
||
|
||
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||
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||
"additional_messages": [
|
||
|
||
|
||
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||
{"role": "user", "content": query, "content_type": "text"}
|
||
|
||
|
||
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],
|
||
|
||
|
||
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||
}
|
||
|
||
|
||
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async with httpx.AsyncClient(timeout=180, proxy=_proxy_for_url(create_url), trust_env=False) as client:
|
||
|
||
|
||
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r = await client.post(create_url, headers=headers, json=payload)
|
||
|
||
|
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if r.status_code != 200:
|
||
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raise RuntimeError(f"Coze create HTTP {r.status_code}: {r.text[:300]}")
|
||
|
||
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cd = r.json()
|
||
|
||
|
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if cd.get("code") not in (0, None):
|
||
|
||
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raise RuntimeError(f"Coze 错误: {cd.get('msg') or cd}")
|
||
|
||
|
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||
chat = cd.get("data") or {}
|
||
|
||
|
||
|
||
chat_id = chat.get("id")
|
||
|
||
|
||
|
||
conv_id2 = chat.get("conversation_id") or ext_conv_id
|
||
|
||
|
||
|
||
if not chat_id or not conv_id2:
|
||
|
||
|
||
|
||
raise RuntimeError(f"Coze 未返回 chat_id/conversation_id: {str(cd)[:200]}")
|
||
|
||
|
||
|
||
# 轮询直到完成(最多约 3 分钟)
|
||
|
||
|
||
|
||
status = chat.get("status")
|
||
|
||
|
||
|
||
for _ in range(60):
|
||
|
||
|
||
|
||
if status == "completed":
|
||
|
||
|
||
|
||
break
|
||
|
||
|
||
|
||
if status in ("failed", "requires_action", "canceled"):
|
||
|
||
|
||
|
||
raise RuntimeError(f"Coze 对话状态 {status}")
|
||
|
||
|
||
|
||
await asyncio.sleep(3)
|
||
|
||
|
||
|
||
rr = await client.get(
|
||
|
||
|
||
|
||
f"{base}/v3/chat/retrieve?chat_id={chat_id}&conversation_id={conv_id2}",
|
||
|
||
|
||
|
||
headers=headers,
|
||
|
||
|
||
|
||
)
|
||
|
||
|
||
|
||
if rr.status_code == 200:
|
||
|
||
|
||
|
||
status = ((rr.json() or {}).get("data") or {}).get("status")
|
||
|
||
|
||
|
||
# 拉取消息列表，取 type=answer 的内容
|
||
|
||
|
||
|
||
rm = await client.get(
|
||
|
||
|
||
|
||
f"{base}/v3/chat/message/list?chat_id={chat_id}&conversation_id={conv_id2}",
|
||
|
||
|
||
|
||
headers=headers,
|
||
|
||
|
||
|
||
)
|
||
|
||
|
||
|
||
answer = ""
|
||
|
||
|
||
|
||
if rm.status_code == 200:
|
||
|
||
|
||
|
||
for m in ((rm.json() or {}).get("data") or []):
|
||
|
||
|
||
|
||
if m.get("type") == "answer" and m.get("role") == "assistant":
|
||
|
||
|
||
|
||
answer = m.get("content", "") or answer
|
||
|
||
|
||
|
||
return (answer or "").strip(), conv_id2
|
||
|
||
async def _call_external_agent(db, agent: dict, query: str, user_id: str,
|
||
|
||
|
||
|
||
ext_conversation_id: str | None,
|
||
|
||
|
||
|
||
history: list) -> tuple:
|
||
|
||
|
||
|
||
"""按平台分发到对应外部 Agent 远程调用。返回 (answer, new_ext_conversation_id)。"""
|
||
|
||
|
||
|
||
platform = (agent.get("platform") or "dify").lower()
|
||
|
||
|
||
|
||
endpoint = agent.get("agent_endpoint")
|
||
|
||
|
||
|
||
api_key = agent.get("agent_api_key") or ""
|
||
|
||
|
||
|
||
if not endpoint:
|
||
|
||
|
||
|
||
raise RuntimeError("该 Agent 未配置远程调用地址(agent_endpoint)")
|
||
|
||
|
||
|
||
if platform == "dify":
|
||
|
||
|
||
|
||
return await _call_dify_agent(endpoint, api_key, query, user_id, ext_conversation_id)
|
||
|
||
|
||
|
||
if platform == "n8n":
|
||
|
||
|
||
|
||
return await _call_n8n_agent(endpoint, api_key, query, user_id, history)
|
||
|
||
|
||
|
||
if platform == "coze":
|
||
|
||
|
||
|
||
return await _call_coze_agent(endpoint, api_key, query, user_id, ext_conversation_id)
|
||
|
||
|
||
|
||
# 未知平台：默认按 Dify 协议尝试
|
||
|
||
|
||
|
||
return await _call_dify_agent(endpoint, api_key, query, user_id, ext_conversation_id)
|