142 lines
5.6 KiB
Python
142 lines
5.6 KiB
Python
# apps/common/services/chat_service.py
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import logging
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import json
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from uuid import uuid4
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from django.db import transaction
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from apps.accounts.models import User
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from apps.knowledge_base.models import KnowledgeBase
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from apps.chat.models import ChatHistory
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from apps.permissions.services.permission_service import KnowledgeBasePermissionMixin
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logger = logging.getLogger(__name__)
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class ChatService(KnowledgeBasePermissionMixin):
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@transaction.atomic
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def create_chat_record(self, user, data, conversation_id=None):
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"""创建聊天记录，供chat、gmail、feishu模块复用"""
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try:
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# 验证必填字段
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if 'question' not in data:
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raise ValueError("缺少必填字段: question")
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# 如果未提供conversation_id，生成新的
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if not conversation_id:
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conversation_id = str(uuid4())
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logger.info(f"生成新的会话ID: {conversation_id}")
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# 处理知识库ID
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dataset_ids = []
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if 'dataset_id' in data:
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dataset_ids.append(str(data['dataset_id']))
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elif 'dataset_id_list' in data:
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if isinstance(data['dataset_id_list'], str):
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try:
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dataset_list = json.loads(data['dataset_id_list'])
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dataset_ids = [str(id) for id in dataset_list if isinstance(dataset_list, list)]
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except json.JSONDecodeError:
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dataset_ids = [str(data['dataset_id_list'])]
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else:
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dataset_ids = [str(id) for id in data['dataset_id_list']]
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if not dataset_ids:
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raise ValueError("缺少必填字段: dataset_id 或 dataset_id_list")
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# 验证知识库权限
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knowledge_bases = []
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external_id_list = []
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for kb_id in dataset_ids:
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knowledge_base = KnowledgeBase.objects.filter(id=kb_id).first()
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if not knowledge_base:
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raise ValueError(f"知识库不存在: {kb_id}")
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if not self.check_knowledge_base_permission(knowledge_base, user, 'read'):
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raise ValueError(f"无权访问知识库: {knowledge_base.name}")
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knowledge_bases.append(knowledge_base)
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if knowledge_base.external_id:
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external_id_list.append(str(knowledge_base.external_id))
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# 创建metadata
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metadata = {
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'model_id': data.get('model_id', '7a214d0e-e65e-11ef-9f4a-0242ac120006'),
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'dataset_id_list': dataset_ids,
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'dataset_external_id_list': external_id_list,
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'dataset_names': [kb.name for kb in knowledge_bases]
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}
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# 设置标题
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title = data.get('title', 'New chat')
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# 创建用户问题记录
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question_record = ChatHistory.objects.create(
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user=user,
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knowledge_base=knowledge_bases[0], # 使用第一个知识库
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conversation_id=conversation_id,
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title=title,
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role='user',
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content=data['question'],
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metadata=metadata
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)
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return question_record, conversation_id, metadata, knowledge_bases, external_id_list
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except Exception as e:
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logger.error(f"创建聊天记录失败: {str(e)}")
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raise
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def get_conversation_detail(self, user, conversation_id):
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"""获取会话详情，供chat、gmail、feishu模块复用"""
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try:
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# 获取用户有权限的知识库ID
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accessible_kb_ids = [
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kb.id for kb in KnowledgeBase.objects.all()
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if self.check_knowledge_base_permission(kb, user, 'read')
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]
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# 查询会话记录
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messages = ChatHistory.objects.filter(
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conversation_id=conversation_id,
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is_deleted=False
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).filter(
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Q(user=user) | Q(knowledge_base_id__in=accessible_kb_ids)
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).order_by('created_at')
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if not messages.exists():
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raise ValueError("对话不存在或无权限")
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# 获取知识库信息
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first_message = messages.first()
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dataset_info = []
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if first_message and first_message.metadata and 'dataset_id_list' in first_message.metadata:
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datasets = KnowledgeBase.objects.filter(id__in=first_message.metadata['dataset_id_list'])
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accessible_datasets = [
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ds for ds in datasets if self.check_knowledge_base_permission(ds, user, 'read')
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]
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dataset_info = [
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{'id': str(ds.id), 'name': ds.name, 'type': ds.type}
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for ds in accessible_datasets
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]
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# 构建消息列表
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message_list = [
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{
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'id': str(msg.id),
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'parent_id': msg.parent_id,
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'role': msg.role,
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'content': msg.content,
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'created_at': msg.created_at.strftime('%Y-%m-%d %H:%M:%S'),
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'metadata': msg.metadata
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}
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for msg in messages
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]
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return {
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'conversation_id': conversation_id,
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'datasets': dataset_info,
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'messages': message_list
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}
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except Exception as e:
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logger.error(f"获取会话详情失败: {str(e)}")
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raise
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