257 lines
9.6 KiB
Python
257 lines
9.6 KiB
Python
"""Conversation service — 对话编排（列表、创建、结束、删除、消息、整理）。"""
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import uuid
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from datetime import datetime, timezone
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from fastapi import HTTPException
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from sqlalchemy.ext.asyncio import AsyncSession
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from app.core.cos_url_keys import extract_cos_object_key_if_owned
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from app.core.logging import get_logger
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from app.core.redis import redis_service
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from app.core.storage_purge import delete_object_storage_keys_best_effort
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from app.features.conversation import repo
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from app.features.conversation.models import Conversation
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from app.features.conversation.session_history import segments_to_redis_history
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from app.features.memory import repo as memory_repo
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from app.features.quota.service import QuotaService
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from app.ports.storage import ObjectStorage
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from app.tasks.memoir_tasks import process_memoir_segments
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logger = get_logger(__name__)
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def _datetime_to_timestamp_ms(value: datetime | None) -> int:
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if value is None:
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return int(datetime.now(timezone.utc).timestamp() * 1000)
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if value.tzinfo is None:
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value = value.replace(tzinfo=timezone.utc)
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return int(value.timestamp() * 1000)
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def _message_timestamp_ms(msg: dict, fallback: datetime | None) -> int:
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raw_timestamp = msg.get("timestamp")
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if isinstance(raw_timestamp, (int, float)):
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return int(raw_timestamp)
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if isinstance(raw_timestamp, str):
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try:
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return int(
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datetime.fromisoformat(raw_timestamp.replace("Z", "+00:00")).timestamp()
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* 1000
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)
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except ValueError:
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pass
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return _datetime_to_timestamp_ms(fallback)
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def _latest_message_time_ms(conversation: Conversation, history: list[dict]) -> int:
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if conversation.last_message_at:
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return _datetime_to_timestamp_ms(conversation.last_message_at)
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if history:
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return _message_timestamp_ms(history[-1], conversation.started_at)
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return _datetime_to_timestamp_ms(conversation.started_at)
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def _build_messages_from_history(
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conversation_id: str,
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history: list[dict],
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fallback_timestamp: datetime | None,
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) -> list[dict]:
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messages: list[dict] = []
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seen_audio_sessions: set[str] = set()
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for idx, msg in enumerate(history):
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role = msg.get("role")
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message_type = msg.get("messageType", "text")
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voice_session_id = msg.get("voiceSessionId")
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if role == "human" and message_type == "audio" and voice_session_id:
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if voice_session_id in seen_audio_sessions:
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continue
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seen_audio_sessions.add(voice_session_id)
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messages.append(
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{
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"id": f"{conversation_id}_msg_{idx}",
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"conversationId": conversation_id,
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"content": msg.get("content", ""),
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"senderType": "user" if role == "human" else "assistant",
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"timestamp": _message_timestamp_ms(msg, fallback_timestamp),
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"messageType": message_type,
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}
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)
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return messages
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class ConversationService:
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def __init__(
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self,
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db: AsyncSession,
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quota_service: QuotaService,
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*,
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object_storage: ObjectStorage | None = None,
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):
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self._db = db
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self._quota = quota_service
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self._object_storage = object_storage
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async def _get_history(self, conversation_id: str) -> list[dict]:
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return await redis_service.get_conversation_history(conversation_id)
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async def _clear_history(self, conversation_id: str) -> None:
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try:
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await redis_service.clear_conversation_history(conversation_id)
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except Exception:
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pass
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async def ensure_redis_history_from_segments(
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self, conversation_id: str
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) -> list[dict]:
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"""
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供 WS 与 get_messages 使用：优先 Redis；若为空则用 DB segments 重建并写回。
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会话层编排，非 Agent 职责（ChatOrchestrator 只读写已存在的 Redis 流）。
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"""
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history = await redis_service.get_conversation_history(conversation_id)
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if history:
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return history
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segments = await repo.get_segments_for_conversation(conversation_id, self._db)
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if not segments:
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return []
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rebuilt = segments_to_redis_history(segments)
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if rebuilt:
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await redis_service.set_conversation_history(conversation_id, rebuilt)
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return rebuilt
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async def list_for_user(self, user_id: str) -> list[dict]:
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conversations = await repo.get_user_conversations(user_id, self._db)
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result = []
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for conv in conversations:
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history: list[dict] = []
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try:
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history = await self._get_history(conv.id)
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except Exception:
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pass
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latest_message = history[-1].get("content", "")[:50] if history else None
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result.append(
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{
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"id": conv.id,
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"title": (conv.summary or "")[:30] or "岁月知己",
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"avatarUrl": None,
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"latestMessagePreview": latest_message or conv.summary,
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"latestMessageTime": _latest_message_time_ms(conv, history),
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"unreadCount": 0,
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"isDefaultAssistant": conv.summary is None,
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}
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)
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return result
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async def create(self, user_id: str) -> dict:
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conv = Conversation(
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id=str(uuid.uuid4()),
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user_id=user_id,
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started_at=datetime.now(timezone.utc),
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status="active",
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)
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repo.add_conversation(conv, self._db)
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await self._db.commit()
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await self._db.refresh(conv)
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return {
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"id": conv.id,
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"user_id": conv.user_id,
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"started_at": conv.started_at.isoformat(),
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"status": conv.status,
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}
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async def get_or_404(self, conversation_id: str, user_id: str) -> Conversation:
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conv = await repo.get_conversation(conversation_id, self._db)
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if not conv or conv.user_id != user_id or conv.deleted_at is not None:
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raise HTTPException(status_code=404, detail="Conversation not found")
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return conv
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async def get_one(self, conversation_id: str, user_id: str) -> dict:
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conv = await self.get_or_404(conversation_id, user_id)
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return {
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"id": conv.id,
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"user_id": conv.user_id,
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"started_at": conv.started_at.isoformat(),
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"ended_at": conv.ended_at.isoformat() if conv.ended_at else None,
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"duration_seconds": conv.duration_seconds,
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"summary": conv.summary,
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"status": conv.status,
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"current_topic": conv.current_topic,
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"conversation_stage": conv.conversation_stage,
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}
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async def end(self, conversation_id: str, user_id: str) -> dict:
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conv = await self.get_or_404(conversation_id, user_id)
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conv.status = "ended"
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conv.ended_at = datetime.now(timezone.utc)
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if conv.started_at:
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conv.duration_seconds = int(
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(conv.ended_at - conv.started_at).total_seconds()
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)
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await self._db.commit()
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return {
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"id": conv.id,
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"status": conv.status,
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"ended_at": conv.ended_at.isoformat(),
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"duration_seconds": conv.duration_seconds,
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}
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async def delete(self, conversation_id: str, user_id: str) -> None:
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conv = await self.get_or_404(conversation_id, user_id)
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cos_keys: set[str] = set(
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await memory_repo.list_storage_keys_for_conversation(
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self._db, conversation_id
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)
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)
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segments = await repo.get_segments_for_conversation(conversation_id, self._db)
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for seg in segments:
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k = extract_cos_object_key_if_owned(seg.audio_url)
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if k:
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cos_keys.add(k)
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await self._clear_history(conversation_id)
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conv.deleted_at = datetime.now(timezone.utc)
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await self._db.commit()
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delete_object_storage_keys_best_effort(
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self._object_storage,
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sorted(cos_keys),
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log_prefix=f"conversation_soft_delete id={conversation_id}",
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)
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async def get_messages(self, conversation_id: str, user_id: str) -> list[dict]:
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conv = await self.get_or_404(conversation_id, user_id)
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try:
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history = await self.ensure_redis_history_from_segments(conversation_id)
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return _build_messages_from_history(
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conversation_id=conversation_id,
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history=history,
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fallback_timestamp=conv.started_at,
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)
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except Exception:
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return []
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async def organize(
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self, conversation_id: str, user_id: str, subscription_type: str
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) -> dict:
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conv = await self.get_or_404(conversation_id, user_id)
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segments = await repo.get_segments_for_organize(conversation_id, self._db)
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if not segments:
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raise HTTPException(status_code=400, detail="该对话没有可整理的内容")
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can_submit, quota_message = await self._quota.check_can_submit_organize(
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user_id, subscription_type
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)
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if not can_submit:
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raise HTTPException(status_code=403, detail=quota_message)
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segment_ids = [s.id for s in segments]
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process_memoir_segments.delay(conv.user_id, segment_ids)
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logger.info(
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"手动触发对话整理: conversation_id=%s, segments=%s",
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conversation_id,
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len(segment_ids),
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)
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return {
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"message": "对话整理任务已提交",
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"conversation_id": conversation_id,
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"segments_count": len(segment_ids),
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}
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