mirror of
https://github.com/jxxghp/MoviePilot.git
synced 2026-06-21 23:44:31 +08:00
537 lines
17 KiB
Python
537 lines
17 KiB
Python
import asyncio
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import hashlib
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import json
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import mimetypes
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import time
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import uuid
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from pathlib import Path
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from typing import Any, AsyncIterator, Callable, Optional
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from fastapi import APIRouter, Depends, HTTPException, Request, status
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from fastapi.responses import FileResponse, StreamingResponse
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from app import schemas
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from app.agent import MoviePilotAgent, ReplyMode, StreamingHandler
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from app.core.config import global_vars, settings
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from app.db.models import User
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from app.db.user_oper import get_current_active_superuser
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from app.log import logger
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from app.schemas.types import MessageChannel
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router = APIRouter()
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WEB_AGENT_SESSION_PREFIX = "web-agent:"
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WEB_AGENT_SOURCE = "web-agent"
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WEB_AGENT_FILE_TTL_SECONDS = 6 * 60 * 60
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WEB_AGENT_FILE_MAX_ITEMS = 256
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_WEB_AGENT_FILE_REGISTRY: dict[str, dict[str, Any]] = {}
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class _WebAgentStreamingHandler(StreamingHandler):
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"""
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Web 前端专用流式处理器，将工具提示和文本统一回调给 SSE。
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"""
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def __init__(self, on_emit: Callable[[str], None]) -> None:
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super().__init__()
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self._on_emit = on_emit
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def emit(self, token: str) -> str:
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"""追加 token 并同步通知 SSE 生产者。"""
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emitted = super().emit(token)
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if emitted:
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self._on_emit(emitted)
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return emitted
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def flush_pending_tool_summary(self) -> str:
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"""输出延迟聚合的工具摘要。"""
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emitted = super().flush_pending_tool_summary()
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if emitted:
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self._on_emit(emitted)
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return ""
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async def start_streaming(
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self,
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channel: Optional[str] = None,
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source: Optional[str] = None,
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user_id: Optional[str] = None,
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username: Optional[str] = None,
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original_message_id: Optional[str] = None,
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original_chat_id: Optional[str] = None,
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title: str = "",
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) -> None:
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"""Web SSE 自身负责外发，不启动消息模块编辑循环。"""
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self._channel = channel
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self._source = source
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self._user_id = user_id
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self._username = username
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self._original_message_id = original_message_id
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self._original_chat_id = original_chat_id
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self._title = title
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self._streaming_enabled = True
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self._sent_text = ""
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self._message_response = None
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self._msg_start_offset = 0
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self._pending_tool_stats = {}
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async def stop_streaming(self) -> tuple[bool, str]:
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"""停止 Web SSE 流式状态，保留缓冲区给 Agent 收口逻辑去重。"""
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if not self._streaming_enabled:
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return False, ""
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self._streaming_enabled = False
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self.flush_pending_tool_summary()
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with self._lock:
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self._sent_text = ""
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self._message_response = None
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self._msg_start_offset = 0
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self._pending_tool_stats = {}
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return False, ""
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@property
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def is_auto_flushing(self) -> bool:
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"""让工具执行提示进入缓冲区，由 SSE 回调负责外发。"""
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return True
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class _WebAgentMoviePilotAgent(MoviePilotAgent):
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"""
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Web 前端专用 Agent，强制使用流式推理。
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"""
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def __init__(
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self,
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*args: Any,
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notification_callback: Optional[Callable[[schemas.Notification], None]] = None,
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**kwargs: Any,
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) -> None:
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super().__init__(*args, **kwargs)
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self._notification_callback = notification_callback
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self.stream_handler = _WebAgentStreamingHandler(self._emit_output)
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def _should_stream(self) -> bool:
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"""Web 面板需要实时输出，即使 Web 渠道本身不支持消息编辑。"""
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return True
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async def _is_system_admin_context(self) -> bool:
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"""Web Agent 入口已要求超级管理员，工具上下文可直接按管理员处理。"""
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return True
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async def _build_tool_context(self, should_dispatch_reply: bool) -> dict[str, object]:
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"""向工具上下文注入 Web SSE 通知回调。"""
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context = await super()._build_tool_context(should_dispatch_reply)
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context["notification_callback"] = self._notification_callback
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return context
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def _handle_stream_text(self, text: str) -> None:
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"""文本输出交由 Web 流式处理器统一回调，避免重复增量。"""
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self.stream_handler.emit(text)
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def _build_web_agent_session_id(user: User, session_id: Optional[str]) -> str:
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"""
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构建前端 Agent 会话 ID。
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:param user: 当前登录用户
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:param session_id: 前端传入的会话标识
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:return: 可用于 Agent 记忆隔离的服务端会话 ID
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"""
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seed = str(session_id or "").strip() or uuid.uuid4().hex
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user_part = user.name or str(user.id)
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digest = hashlib.sha256(f"{user_part}:{seed}".encode("utf-8")).hexdigest()
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return f"{WEB_AGENT_SESSION_PREFIX}{digest[:32]}"
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def _build_web_agent_sse(event_type: str, data: Optional[dict] = None) -> str:
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"""
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构建 Web Agent SSE 消息。
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:param event_type: 前端事件类型
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:param data: 事件数据
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:return: 符合 SSE 格式的字符串
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"""
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payload = {"type": event_type, **(data or {})}
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return f"data: {json.dumps(payload, ensure_ascii=False)}\n\n"
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def _cleanup_web_agent_file_registry() -> None:
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"""清理过期或过量的 Web Agent 临时附件引用。"""
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now = time.time()
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expired_ids = [
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file_id
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for file_id, info in _WEB_AGENT_FILE_REGISTRY.items()
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if now - info.get("created_at", now) > WEB_AGENT_FILE_TTL_SECONDS
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]
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for file_id in expired_ids:
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_WEB_AGENT_FILE_REGISTRY.pop(file_id, None)
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overflow = len(_WEB_AGENT_FILE_REGISTRY) - WEB_AGENT_FILE_MAX_ITEMS
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if overflow <= 0:
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return
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sorted_items = sorted(
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_WEB_AGENT_FILE_REGISTRY.items(),
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key=lambda item: item[1].get("created_at", 0),
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)
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for file_id, _ in sorted_items[:overflow]:
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_WEB_AGENT_FILE_REGISTRY.pop(file_id, None)
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def _guess_web_agent_attachment_kind(
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mime_type: Optional[str], fallback: str = "file"
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) -> str:
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"""
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根据 MIME 类型推断前端附件展示方式。
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:param mime_type: 文件 MIME 类型
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:param fallback: 无法推断时使用的类型
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:return: image、audio 或 file
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"""
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if mime_type and mime_type.startswith("image/"):
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return "image"
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if mime_type and mime_type.startswith("audio/"):
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return "audio"
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return fallback
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def _build_web_agent_url_attachment(
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url: str,
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kind: str,
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name: Optional[str] = None,
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mime_type: Optional[str] = None,
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) -> dict:
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"""
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构建远程或 data URL 附件事件。
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:param url: 前端可访问的附件地址
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:param kind: 附件展示类型
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:param name: 展示名称
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:param mime_type: MIME 类型
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:return: 前端附件描述
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"""
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return {
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"kind": kind,
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"url": url,
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"download_url": url,
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"name": name,
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"mime_type": mime_type,
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}
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def _register_web_agent_file(
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file_path: Optional[str],
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file_name: Optional[str] = None,
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kind: Optional[str] = None,
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) -> Optional[dict]:
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"""
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注册 Web Agent 本地附件并返回前端可访问的短期下载地址。
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:param file_path: 本地文件路径
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:param file_name: 前端展示文件名
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:param kind: 附件展示类型
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:return: 前端附件描述，文件不可访问时返回 None
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"""
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if not file_path:
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return None
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try:
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resolved_path = Path(file_path).expanduser().resolve(strict=True)
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except OSError:
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return None
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if not resolved_path.is_file():
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return None
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_cleanup_web_agent_file_registry()
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file_id = uuid.uuid4().hex
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display_name = file_name or resolved_path.name
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mime_type = mimetypes.guess_type(display_name or str(resolved_path))[0]
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file_url = f"message/agent/file/{file_id}"
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_WEB_AGENT_FILE_REGISTRY[file_id] = {
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"path": resolved_path,
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"name": display_name,
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"mime_type": mime_type or "application/octet-stream",
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"created_at": time.time(),
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}
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return {
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"kind": kind or _guess_web_agent_attachment_kind(mime_type),
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"url": file_url,
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"download_url": file_url,
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"name": display_name,
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"mime_type": mime_type,
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"size": resolved_path.stat().st_size,
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}
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def _build_web_agent_notification_events(
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notification: schemas.Notification,
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) -> list[dict]:
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"""
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将 Agent 工具通知转换为 Web SSE 事件。
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:param notification: 工具产生的通知消息
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:return: 前端可直接应用到当前助手消息的事件列表
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"""
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events = []
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text_parts = [
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str(item).strip()
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for item in (notification.title, notification.text)
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if str(item or "").strip()
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]
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if text_parts:
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events.append({"type": "delta", "content": "\n\n".join(text_parts)})
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if notification.image:
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image_ref = notification.image
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image_path = Path(image_ref).expanduser()
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attachment = None
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if not image_ref.startswith(("http://", "https://", "data:", "blob:")):
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attachment = _register_web_agent_file(
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image_ref, file_name=Path(image_ref).name, kind="image"
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)
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if not attachment:
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attachment = _build_web_agent_url_attachment(
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image_ref,
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kind="image",
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name=notification.title or image_path.name or "image",
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)
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events.append({"type": "attachment", "attachment": attachment})
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if notification.voice_path:
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attachment = _register_web_agent_file(
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notification.voice_path,
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file_name=Path(notification.voice_path).name,
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kind="audio",
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)
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if attachment:
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events.append({"type": "attachment", "attachment": attachment})
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if notification.file_path:
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attachment = _register_web_agent_file(
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notification.file_path,
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file_name=notification.file_name or Path(notification.file_path).name,
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)
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if attachment:
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events.append({"type": "attachment", "attachment": attachment})
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return events
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def _split_web_agent_output(text: str) -> list[dict]:
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"""
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将 Agent 输出拆成普通文本与工具提示事件。
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:param text: 本次新增的 Agent 文本
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:return: 前端可直接渲染的事件片段
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"""
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if not text:
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return []
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events = []
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def append_text(content: str) -> None:
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"""将工具汇总行从普通文本中拆出，便于前端独立展示。"""
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if not content or not content.strip():
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return
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lines = content.splitlines(keepends=True)
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buffer = ""
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for line in lines:
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stripped_line = line.strip()
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if (
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stripped_line.startswith("（")
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and stripped_line.endswith("）")
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):
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if buffer:
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events.append({"type": "delta", "content": buffer})
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buffer = ""
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events.append(
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{
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"type": "tool",
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"message": stripped_line.strip("（）"),
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}
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)
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else:
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buffer += line
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if buffer:
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events.append({"type": "delta", "content": buffer})
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marker = "⚙️ => "
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remaining = text
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while remaining:
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marker_index = remaining.find(marker)
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if marker_index < 0:
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append_text(remaining)
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break
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if marker_index > 0:
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append_text(remaining[:marker_index])
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after_marker = remaining[marker_index + len(marker):]
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line_end = after_marker.find("\n")
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if line_end < 0:
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message = after_marker.strip()
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remaining = ""
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else:
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message = after_marker[:line_end].strip()
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remaining = after_marker[line_end:].lstrip("\n")
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if message:
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events.append({"type": "tool", "message": message})
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return events
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@router.get("/file/{file_id}", summary="下载 Web 智能助手附件")
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async def download_web_agent_file(file_id: str) -> FileResponse:
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"""
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下载 Web 智能助手本轮生成的临时附件。
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:param file_id: 附件随机标识
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:return: 附件文件响应
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"""
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_cleanup_web_agent_file_registry()
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file_info = _WEB_AGENT_FILE_REGISTRY.get(file_id)
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if not file_info:
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raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="附件不存在或已过期")
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file_path = file_info["path"]
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if not file_path.exists() or not file_path.is_file():
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_WEB_AGENT_FILE_REGISTRY.pop(file_id, None)
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raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="附件不存在或已过期")
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return FileResponse(
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path=file_path,
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media_type=file_info.get("mime_type") or "application/octet-stream",
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filename=file_info.get("name") or file_path.name,
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)
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@router.post("/stream", summary="Web智能助手流式对话")
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async def web_agent_stream(
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payload: schemas.AgentWebChatRequest,
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request: Request,
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current_user: User = Depends(get_current_active_superuser),
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) -> StreamingResponse:
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"""
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Web 智能助手流式对话。
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:param payload: 对话请求
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:param request: 当前 HTTP 请求
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:param current_user: 当前登录管理员
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:return: SSE 流式响应
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"""
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if not settings.AI_AGENT_ENABLE:
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return StreamingResponse(
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iter([
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_build_web_agent_sse(
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"error",
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{"message": "智能助手未启用，请先在系统设置中开启。"},
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)
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]),
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media_type="text/event-stream",
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)
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prompt = payload.text.strip()
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if not prompt:
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return StreamingResponse(
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iter([
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_build_web_agent_sse(
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"error",
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{"message": "请输入要发送给智能助手的内容。"},
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)
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]),
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media_type="text/event-stream",
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)
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session_id = _build_web_agent_session_id(current_user, payload.session_id)
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event_queue: asyncio.Queue = asyncio.Queue()
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last_output = ""
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def output_callback(output: str) -> None:
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"""
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接收 Agent 累积输出并转成增量事件。
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"""
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nonlocal last_output
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delta = output[len(last_output):] if output.startswith(last_output) else output
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last_output = output
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for item in _split_web_agent_output(delta):
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event_queue.put_nowait(item)
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def notification_callback(notification: schemas.Notification) -> None:
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"""
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接收 Agent 工具主动发送的 Web 通知。
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"""
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for item in _build_web_agent_notification_events(notification):
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event_queue.put_nowait(item)
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async def event_generator() -> AsyncIterator[str]:
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"""
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生成前端 Agent SSE 事件。
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"""
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files = [
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file.model_dump(exclude_none=True)
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for file in (payload.files or [])
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]
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for audio_ref in payload.audio_refs or []:
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files.append({"ref": audio_ref, "mime_type": "audio/*"})
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agent = _WebAgentMoviePilotAgent(
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session_id=session_id,
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user_id=str(current_user.id),
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channel=MessageChannel.WebAgent.value,
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source=WEB_AGENT_SOURCE,
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username=current_user.name,
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replay_mode=ReplyMode.CAPTURE_ONLY,
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persist_output_message=False,
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allow_message_tools=True,
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output_callback=output_callback,
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notification_callback=notification_callback,
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)
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async def run_agent() -> None:
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"""后台执行 Agent，并将结果写入事件队列。"""
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try:
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await agent.process(
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message=prompt,
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images=payload.images or [],
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files=files or None,
|
||
has_audio_input=bool(payload.audio_refs),
|
||
)
|
||
except Exception as err:
|
||
logger.error(f"Web智能助手执行失败: {str(err)}")
|
||
await event_queue.put(
|
||
{"type": "error", "message": f"智能助手执行失败: {str(err)}"}
|
||
)
|
||
finally:
|
||
await event_queue.put({"type": "done"})
|
||
|
||
task = asyncio.create_task(run_agent())
|
||
try:
|
||
yield _build_web_agent_sse(
|
||
"start",
|
||
{"session_id": payload.session_id or session_id},
|
||
)
|
||
while not global_vars.is_system_stopped:
|
||
if await request.is_disconnected():
|
||
break
|
||
event = await event_queue.get()
|
||
yield _build_web_agent_sse(event.pop("type"), event)
|
||
if task.done() and event_queue.empty():
|
||
break
|
||
except asyncio.CancelledError:
|
||
return
|
||
finally:
|
||
if not task.done():
|
||
task.cancel()
|
||
try:
|
||
await task
|
||
except asyncio.CancelledError:
|
||
pass
|
||
await agent.cleanup()
|
||
|
||
return StreamingResponse(
|
||
event_generator(),
|
||
media_type="text/event-stream",
|
||
headers={
|
||
"Cache-Control": "no-cache",
|
||
"Connection": "keep-alive",
|
||
"X-Accel-Buffering": "no",
|
||
},
|
||
)
|