279 lines
11 KiB
Python
279 lines
11 KiB
Python
"""会话服务"""
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import uuid
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from datetime import datetime
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from sqlalchemy import select, func
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from sqlalchemy.ext.asyncio import AsyncSession
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from app.models.conversation import Conversation
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from app.models.conversation_member import ConversationMember
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from app.models.user import User
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class ConversationService:
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def __init__(self, db: AsyncSession):
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self.db = db
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async def get_or_create_private(self, user1_id: str, user2_id: str) -> Conversation:
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"""获取或创建私聊会话"""
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result = await self.db.execute(
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select(Conversation).join(ConversationMember)
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.where(
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Conversation.type == "private",
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ConversationMember.user_id == user1_id,
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)
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)
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for conv in result.scalars().all():
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member_result = await self.db.execute(
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select(ConversationMember).where(
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ConversationMember.conversation_id == conv.id,
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ConversationMember.user_id == user2_id,
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)
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)
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if member_result.scalars().first():
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return conv
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conv = Conversation(id=str(uuid.uuid4()), type="private")
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self.db.add(conv)
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await self.db.flush()
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self.db.add(ConversationMember(
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id=str(uuid.uuid4()), conversation_id=conv.id, user_id=user1_id, role="member"
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))
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self.db.add(ConversationMember(
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id=str(uuid.uuid4()), conversation_id=conv.id, user_id=user2_id, role="member"
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))
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return conv
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async def create_group(self, creator_id: str, name: str, member_ids: list[str],
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description: str | None = None) -> Conversation:
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"""创建群聊"""
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conv = Conversation(
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id=str(uuid.uuid4()),
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type="group",
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name=name,
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description=description,
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creator_id=creator_id,
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)
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self.db.add(conv)
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await self.db.flush()
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self.db.add(ConversationMember(
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id=str(uuid.uuid4()), conversation_id=conv.id,
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user_id=creator_id, role="owner"
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))
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for mid in member_ids:
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if mid != creator_id:
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self.db.add(ConversationMember(
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id=str(uuid.uuid4()), conversation_id=conv.id,
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user_id=mid, role="member"
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))
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return conv
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async def update_group(self, conv_id: str, user_id: str, **kwargs):
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"""更新群聊信息（仅群主/管理员）"""
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conv = await self._get_conv_if_admin(conv_id, user_id)
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for key, value in kwargs.items():
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if value is not None and hasattr(conv, key):
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setattr(conv, key, value)
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async def add_members(self, conv_id: str, user_id: str, new_member_ids: list[str]):
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"""添加群成员（仅群主/管理员）"""
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await self._get_conv_if_admin(conv_id, user_id)
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for mid in new_member_ids:
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# 检查是否已在群中
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existing = await self.db.execute(
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select(ConversationMember).where(
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ConversationMember.conversation_id == conv_id,
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ConversationMember.user_id == mid,
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ConversationMember.left_at.is_(None),
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)
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)
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if not existing.scalars().first():
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self.db.add(ConversationMember(
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id=str(uuid.uuid4()), conversation_id=conv_id,
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user_id=mid, role="member"
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))
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async def remove_member(self, conv_id: str, user_id: str, target_user_id: str):
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"""移除群成员（仅群主/管理员，不能移除群主）"""
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await self._get_conv_if_admin(conv_id, user_id)
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member = await self._get_member(conv_id, target_user_id)
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if not member:
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raise ValueError("该用户不在群中")
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if member.role == "owner":
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raise ValueError("不能移除群主")
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member.left_at = datetime.utcnow()
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async def leave_group(self, conv_id: str, user_id: str):
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"""退出群聊"""
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member = await self._get_member(conv_id, user_id)
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if not member:
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raise ValueError("你不在该群中")
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if member.role == "owner":
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raise ValueError("群主不能退出，请先转让群主身份")
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member.left_at = datetime.utcnow()
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async def update_member_role(self, conv_id: str, user_id: str, target_user_id: str, role: str):
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"""修改成员角色（仅群主）"""
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member = await self._get_member(conv_id, user_id)
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if not member or member.role != "owner":
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raise ValueError("只有群主可以修改角色")
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target = await self._get_member(conv_id, target_user_id)
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if not target:
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raise ValueError("目标用户不在群中")
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target.role = role
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async def _get_conv_if_admin(self, conv_id: str, user_id: str) -> Conversation:
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"""获取会话并验证管理员权限"""
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conv_result = await self.db.execute(
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select(Conversation).where(Conversation.id == conv_id)
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)
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conv = conv_result.scalars().first()
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if not conv:
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raise ValueError("会话不存在")
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if conv.type != "group":
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raise ValueError("仅群聊支持此操作")
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member = await self._get_member(conv_id, user_id)
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if not member or member.role not in ("owner", "admin"):
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raise ValueError("仅群主或管理员可执行此操作")
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return conv
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async def _get_member(self, conv_id: str, user_id: str) -> ConversationMember | None:
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"""获取成员记录"""
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result = await self.db.execute(
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select(ConversationMember).where(
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ConversationMember.conversation_id == conv_id,
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ConversationMember.user_id == user_id,
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ConversationMember.left_at.is_(None),
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)
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)
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return result.scalars().first()
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async def get_user_conversations(self, user_id: str) -> list[dict]:
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"""获取用户的会话列表"""
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result = await self.db.execute(
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select(ConversationMember)
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.where(ConversationMember.user_id == user_id, ConversationMember.left_at.is_(None))
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.order_by(ConversationMember.joined_at.desc())
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)
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members = result.scalars().all()
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conversations = []
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for member in members:
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conv_result = await self.db.execute(
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select(Conversation).where(Conversation.id == member.conversation_id)
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)
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conv = conv_result.scalars().first()
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if not conv:
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continue
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unread = await self._get_unread_count(conv.id, member.last_read_message_id)
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display_name = conv.name
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display_avatar = conv.avatar_url
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if conv.type == "private":
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other = await self._get_other_member(conv.id, user_id)
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if other:
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display_name = other.nickname or other.username
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display_avatar = other.avatar_url
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conversations.append({
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"id": conv.id,
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"type": conv.type,
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"name": display_name,
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"avatar_url": display_avatar,
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"description": conv.description,
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"last_message_preview": conv.last_message_preview,
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"last_message_at": conv.last_message_at,
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"unread_count": unread,
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"created_at": conv.created_at,
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})
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conversations.sort(key=lambda x: x["last_message_at"] or x["created_at"], reverse=True)
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return conversations
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async def get_conversation_detail(self, conv_id: str, user_id: str) -> dict | None:
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"""获取会话详情"""
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conv_result = await self.db.execute(
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select(Conversation).where(Conversation.id == conv_id)
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)
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conv = conv_result.scalars().first()
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if not conv:
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return None
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member_result = await self.db.execute(
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select(ConversationMember).where(
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ConversationMember.conversation_id == conv_id,
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ConversationMember.user_id == user_id,
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ConversationMember.left_at.is_(None),
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)
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)
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if not member_result.scalars().first():
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return None
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members_result = await self.db.execute(
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select(ConversationMember).where(
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ConversationMember.conversation_id == conv_id,
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ConversationMember.left_at.is_(None),
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)
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)
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members = []
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for m in members_result.scalars().all():
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user_result = await self.db.execute(select(User).where(User.id == m.user_id))
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user = user_result.scalars().first()
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if user:
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members.append({
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"id": m.id,
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"user_id": user.id,
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"username": user.username,
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"nickname": user.nickname,
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"avatar_url": user.avatar_url,
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"role": m.role,
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"joined_at": m.joined_at,
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})
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return {
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"id": conv.id,
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"type": conv.type,
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"name": conv.name,
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"avatar_url": conv.avatar_url,
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"description": conv.description,
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"last_message_preview": conv.last_message_preview,
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"last_message_at": conv.last_message_at,
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"created_at": conv.created_at,
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"members": members,
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"unread_count": await self._get_unread_count(conv.id, None),
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}
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async def _get_other_member(self, conv_id: str, user_id: str) -> User | None:
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"""获取私聊的对方用户"""
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result = await self.db.execute(
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select(ConversationMember).where(
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ConversationMember.conversation_id == conv_id,
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ConversationMember.user_id != user_id,
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)
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)
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member = result.scalars().first()
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if member:
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user_result = await self.db.execute(select(User).where(User.id == member.user_id))
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return user_result.scalars().first()
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return None
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async def _get_unread_count(self, conv_id: str, last_read_id: str | None) -> int:
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"""计算未读消息数"""
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from app.models.message import Message
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query = select(func.count(Message.id)).where(
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Message.conversation_id == conv_id,
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Message.is_deleted == False,
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)
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if last_read_id:
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lr = await self.db.execute(select(Message).where(Message.id == last_read_id))
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lr_msg = lr.scalars().first()
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if lr_msg:
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query = query.where(Message.created_at > lr_msg.created_at)
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result = await self.db.execute(query)
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return result.scalar() or 0
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