287 lines
11 KiB
Python
287 lines
11 KiB
Python
"""
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异步知识库服务 - 处理知识库生成的异步任务
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采用FastAPI BackgroundTasks模式
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"""
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import uuid
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from datetime import datetime
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from typing import Optional, Dict, Any, List
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import redis
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from app.core.database import get_db_connection
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from app.services.llm_service import LLMService
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class AsyncKnowledgeBaseService:
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"""异步知识库服务类 - 处理知识库相关的异步任务"""
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def __init__(self):
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from app.core.config import REDIS_CONFIG
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if 'decode_responses' not in REDIS_CONFIG:
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REDIS_CONFIG['decode_responses'] = True
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self.redis_client = redis.Redis(**REDIS_CONFIG)
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self.llm_service = LLMService()
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def start_generation(self, user_id: int, kb_id: int, user_prompt: Optional[str], source_meeting_ids: Optional[str], cursor=None) -> str:
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"""
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创建异步知识库生成任务
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Args:
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user_id: 用户ID
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kb_id: 知识库ID
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user_prompt: 用户提示词
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source_meeting_ids: 源会议ID列表
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cursor: 数据库游标（可选）
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Returns:
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str: 任务ID
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"""
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task_id = str(uuid.uuid4())
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# If a cursor is passed, use it directly to avoid creating a new transaction
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if cursor:
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query = """
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INSERT INTO knowledge_base_tasks (task_id, user_id, kb_id, user_prompt, created_at)
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VALUES (%s, %s, %s, %s, NOW())
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"""
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cursor.execute(query, (task_id, user_id, kb_id, user_prompt))
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else:
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# Fallback to the old method if no cursor is provided
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self._save_task_to_db(task_id, user_id, kb_id, user_prompt)
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current_time = datetime.now().isoformat()
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task_data = {
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'task_id': task_id,
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'user_id': str(user_id),
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'kb_id': str(kb_id),
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'user_prompt': user_prompt if user_prompt else "",
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'status': 'pending',
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'progress': '0',
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'created_at': current_time,
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'updated_at': current_time
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}
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self.redis_client.hset(f"kb_task:{task_id}", mapping=task_data)
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self.redis_client.expire(f"kb_task:{task_id}", 86400)
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print(f"Knowledge base generation task created: {task_id} for kb_id: {kb_id}")
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return task_id
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def _process_task(self, task_id: str):
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"""
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处理单个异步任务的函数，设计为由BackgroundTasks调用。
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"""
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print(f"Background task started for knowledge base task: {task_id}")
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try:
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# 从Redis获取任务数据
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task_data = self.redis_client.hgetall(f"kb_task:{task_id}")
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if not task_data:
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print(f"Error: Task {task_id} not found in Redis for processing.")
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return
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kb_id = int(task_data['kb_id'])
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user_prompt = task_data.get('user_prompt', '')
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# 1. 更新状态为processing
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self._update_task_status_in_redis(task_id, 'processing', 10, message="任务已开始...")
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# 2. 获取关联的会议总结
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self._update_task_status_in_redis(task_id, 'processing', 20, message="获取关联会议纪要...")
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source_text = self._get_meeting_summaries(kb_id)
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# 3. 构建提示词
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self._update_task_status_in_redis(task_id, 'processing', 30, message="准备AI提示词...")
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full_prompt = self._build_prompt(source_text, user_prompt)
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# 4. 调用LLM API
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self._update_task_status_in_redis(task_id, 'processing', 50, message="AI正在生成知识库...")
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generated_content = self.llm_service._call_llm_api(full_prompt)
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if not generated_content:
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raise Exception("LLM API调用失败或返回空内容")
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# 5. 保存结果到数据库
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self._update_task_status_in_redis(task_id, 'processing', 95, message="保存结果...")
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self._save_result_to_db(kb_id, generated_content)
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# 6. 任务完成
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self._update_task_in_db(task_id, 'completed', 100)
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self._update_task_status_in_redis(task_id, 'completed', 100)
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print(f"Task {task_id} completed successfully")
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except Exception as e:
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error_msg = str(e)
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print(f"Task {task_id} failed: {error_msg}")
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# 更新失败状态
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self._update_task_in_db(task_id, 'failed', 0, error_message=error_msg)
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self._update_task_status_in_redis(task_id, 'failed', 0, error_message=error_msg)
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# --- 知识库相关方法 ---
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def _get_meeting_summaries(self, kb_id: int) -> str:
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"""
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从数据库获取知识库关联的会议总结
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Args:
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kb_id: 知识库ID
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Returns:
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str: 拼接后的会议总结文本
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"""
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try:
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with get_db_connection() as connection:
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cursor = connection.cursor(dictionary=True)
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# 获取知识库的源会议ID列表
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cursor.execute("SELECT source_meeting_ids FROM knowledge_bases WHERE kb_id = %s", (kb_id,))
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kb_info = cursor.fetchone()
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if not kb_info or not kb_info['source_meeting_ids']:
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return ""
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# 解析会议ID列表
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meeting_ids = [int(m_id) for m_id in kb_info['source_meeting_ids'].split(',') if m_id.isdigit()]
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if not meeting_ids:
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return ""
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# 获取所有会议的总结
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summaries = []
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for meeting_id in meeting_ids:
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cursor.execute("SELECT summary FROM meetings WHERE meeting_id = %s", (meeting_id,))
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summary = cursor.fetchone()
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if summary and summary['summary']:
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summaries.append(summary['summary'])
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# 用分隔符拼接多个会议总结
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return "\n\n---\n\n".join(summaries)
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except Exception as e:
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print(f"获取会议总结错误: {e}")
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return ""
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def _build_prompt(self, source_text: str, user_prompt: str) -> str:
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"""
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构建完整的提示词
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使用数据库中配置的KNOWLEDGE_TASK提示词模板
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Args:
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source_text: 源会议总结文本
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user_prompt: 用户自定义提示词
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Returns:
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str: 完整的提示词
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"""
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# 从数据库获取知识库任务的提示词模板
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system_prompt = self.llm_service.get_task_prompt('KNOWLEDGE_TASK')
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prompt = f"{system_prompt}\n\n"
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if source_text:
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prompt += f"请参考以下会议纪要内容：\n{source_text}\n\n"
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prompt += f"用户要求：{user_prompt}"
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return prompt
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def _save_result_to_db(self, kb_id: int, content: str) -> Optional[int]:
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"""
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保存生成结果到数据库
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Args:
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kb_id: 知识库ID
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content: 生成的内容
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Returns:
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Optional[int]: 知识库ID，失败返回None
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"""
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try:
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with get_db_connection() as connection:
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cursor = connection.cursor()
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query = "UPDATE knowledge_bases SET content = %s, updated_at = NOW() WHERE kb_id = %s"
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cursor.execute(query, (content, kb_id))
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connection.commit()
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print(f"成功保存知识库内容，kb_id: {kb_id}")
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return kb_id
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except Exception as e:
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print(f"保存知识库内容错误: {e}")
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return None
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# --- 状态查询和数据库操作方法 ---
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def get_task_status(self, task_id: str) -> Dict[str, Any]:
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"""获取任务状态"""
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try:
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task_data = self.redis_client.hgetall(f"kb_task:{task_id}")
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if not task_data:
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task_data = self._get_task_from_db(task_id)
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if not task_data:
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return {'task_id': task_id, 'status': 'not_found', 'error_message': 'Task not found'}
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return {
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'task_id': task_id,
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'status': task_data.get('status', 'unknown'),
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'progress': int(task_data.get('progress', 0)),
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'kb_id': int(task_data.get('kb_id', 0)),
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'created_at': task_data.get('created_at'),
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'updated_at': task_data.get('updated_at'),
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'error_message': task_data.get('error_message')
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}
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except Exception as e:
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print(f"Error getting task status: {e}")
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return {'task_id': task_id, 'status': 'error', 'error_message': str(e)}
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def _update_task_status_in_redis(self, task_id: str, status: str, progress: int, message: str = None, error_message: str = None):
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"""更新Redis中的任务状态"""
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try:
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update_data = {
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'status': status,
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'progress': str(progress),
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'updated_at': datetime.now().isoformat()
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}
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if message: update_data['message'] = message
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if error_message: update_data['error_message'] = error_message
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self.redis_client.hset(f"kb_task:{task_id}", mapping=update_data)
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except Exception as e:
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print(f"Error updating task status in Redis: {e}")
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def _save_task_to_db(self, task_id: str, user_id: int, kb_id: int, user_prompt: str):
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"""保存任务到数据库"""
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try:
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with get_db_connection() as connection:
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cursor = connection.cursor()
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insert_query = "INSERT INTO knowledge_base_tasks (task_id, user_id, kb_id, user_prompt, status, progress, created_at) VALUES (%s, %s, %s, %s, 'pending', 0, NOW())"
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cursor.execute(insert_query, (task_id, user_id, kb_id, user_prompt))
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connection.commit()
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except Exception as e:
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print(f"Error saving task to database: {e}")
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raise
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def _update_task_in_db(self, task_id: str, status: str, progress: int, error_message: str = None):
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"""更新数据库中的任务状态"""
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try:
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with get_db_connection() as connection:
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cursor = connection.cursor()
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query = "UPDATE knowledge_base_tasks SET status = %s, progress = %s, error_message = %s, updated_at = NOW(), completed_at = IF(%s = 'completed', NOW(), completed_at) WHERE task_id = %s"
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cursor.execute(query, (status, progress, error_message, status, task_id))
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connection.commit()
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except Exception as e:
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print(f"Error updating task in database: {e}")
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def _get_task_from_db(self, task_id: str) -> Optional[Dict[str, str]]:
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"""从数据库获取任务信息"""
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try:
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with get_db_connection() as connection:
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cursor = connection.cursor(dictionary=True)
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query = "SELECT * FROM knowledge_base_tasks WHERE task_id = %s"
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cursor.execute(query, (task_id,))
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task = cursor.fetchone()
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if task:
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# 确保所有字段都是字符串，以匹配Redis的行为
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return {k: v.isoformat() if isinstance(v, datetime) else str(v) for k, v in task.items()}
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return None
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except Exception as e:
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print(f"Error getting task from database: {e}")
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return None
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# 创建全局实例
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async_kb_service = AsyncKnowledgeBaseService()
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