154 lines
7.3 KiB
Python
154 lines
7.3 KiB
Python
from sqlalchemy import select, insert, update, and_, text, func, desc
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from backend.core.database import db
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from backend.utils.common import normalize_url
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import logging
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# 获取当前模块的专用 Logger
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# __name__ 会自动识别为 "backend.services.crawler_service" 这样的路径
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logger = logging.getLogger(__name__)
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class DataService:
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"""
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数据持久化服务层
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"""
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def __init__(self):
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self.db = db
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def register_task(self, url: str):
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clean_url = normalize_url(url)
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with self.db.engine.begin() as conn:
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query = select(self.db.tasks.c.id).where(self.db.tasks.c.root_url == clean_url)
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existing = conn.execute(query).fetchone()
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if existing:
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return {"task_id": existing[0], "is_new_task": False}
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else:
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stmt = insert(self.db.tasks).values(root_url=clean_url).returning(self.db.tasks.c.id)
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new_task = conn.execute(stmt).fetchone()
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return {"task_id": new_task[0], "is_new_task": True}
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def add_urls(self, task_id: int, urls: list[str]):
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success_urls = []
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with self.db.engine.begin() as conn:
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for url in urls:
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clean_url = normalize_url(url)
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try:
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check_q = select(self.db.queue.c.id).where(
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and_(self.db.queue.c.task_id == task_id, self.db.queue.c.url == clean_url)
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)
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if not conn.execute(check_q).fetchone():
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conn.execute(insert(self.db.queue).values(task_id=task_id, url=clean_url, status='pending'))
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success_urls.append(clean_url)
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except Exception:
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pass
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return {"msg": f"Added {len(success_urls)} new urls"}
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def get_pending_urls(self, task_id: int, limit: int):
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with self.db.engine.begin() as conn:
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# 原子锁定：获取并标记为 processing
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subquery = select(self.db.queue.c.id).where(
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and_(self.db.queue.c.task_id == task_id, self.db.queue.c.status == 'pending')
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).limit(limit).with_for_update(skip_locked=True)
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stmt = update(self.db.queue).where(
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self.db.queue.c.id.in_(subquery)
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).values(status='processing').returning(self.db.queue.c.url)
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result = conn.execute(stmt).fetchall()
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return [r[0] for r in result]
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def mark_url_status(self, task_id: int, url: str, status: str):
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clean_url = normalize_url(url)
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with self.db.engine.begin() as conn:
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conn.execute(update(self.db.queue).where(
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and_(self.db.queue.c.task_id == task_id, self.db.queue.c.url == clean_url)
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).values(status=status))
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def get_task_monitor_data(self, task_id: int):
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"""[数据库层监控] 获取持久化的任务状态"""
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with self.db.engine.connect() as conn:
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# 1. 检查任务是否存在
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task_exists = conn.execute(select(self.db.tasks.c.root_url).where(self.db.tasks.c.id == task_id)).fetchone()
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if not task_exists:
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return None
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# 2. 统计各状态数量
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stats_rows = conn.execute(select(
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self.db.queue.c.status, func.count(self.db.queue.c.id)
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).where(self.db.queue.c.task_id == task_id).group_by(self.db.queue.c.status)).fetchall()
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stats = {"pending": 0, "processing": 0, "completed": 0, "failed": 0}
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for status, count in stats_rows:
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if status in stats: stats[status] = count
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stats["total"] = sum(stats.values())
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return {
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"root_url": task_exists[0],
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"db_stats": stats
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}
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def save_chunks(self, task_id: int, source_url: str, title: str, chunks_data: list):
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clean_url = normalize_url(source_url)
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with self.db.engine.begin() as conn:
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for item in chunks_data:
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idx = item['index']
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meta = item.get('meta_info', {})
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existing = conn.execute(select(self.db.chunks.c.id).where(
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and_(self.db.chunks.c.task_id == task_id,
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self.db.chunks.c.source_url == clean_url,
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self.db.chunks.c.chunk_index == idx)
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)).fetchone()
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values = {
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"task_id": task_id, "source_url": clean_url, "chunk_index": idx,
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"title": title, "content": item['content'], "embedding": item['embedding'],
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"meta_info": meta
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}
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if existing:
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conn.execute(update(self.db.chunks).where(self.db.chunks.c.id == existing[0]).values(**values))
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else:
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conn.execute(insert(self.db.chunks).values(**values))
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conn.execute(update(self.db.queue).where(
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and_(self.db.queue.c.task_id == task_id, self.db.queue.c.url == clean_url)
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).values(status='completed'))
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def search(self, query_text: str, query_vector: list, task_id=None, candidates_num: int = 50):
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# 向量格式清洗
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if hasattr(query_vector, 'tolist'): query_vector = query_vector.tolist()
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if isinstance(query_vector, list) and len(query_vector) > 0 and isinstance(query_vector[0], list):
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query_vector = query_vector[0]
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results = []
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with self.db.engine.connect() as conn:
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keyword_query = func.websearch_to_tsquery('english', query_text)
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vector_score = (1 - self.db.chunks.c.embedding.cosine_distance(query_vector))
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keyword_score = func.ts_rank(self.db.chunks.c.content_tsvector, keyword_query)
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final_score = (vector_score * 0.7 + func.coalesce(keyword_score, 0) * 0.3).label("score")
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stmt = select(
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self.db.chunks.c.task_id, self.db.chunks.c.source_url, self.db.chunks.c.title,
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self.db.chunks.c.content, self.db.chunks.c.meta_info, final_score
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)
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if task_id: stmt = stmt.where(self.db.chunks.c.task_id == task_id)
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stmt = stmt.order_by(desc("score")).limit(candidates_num)
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try:
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rows = conn.execute(stmt).fetchall()
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results = [{"task_id": r[0], "source_url": r[1], "title": r[2], "content": r[3], "meta_info": r[4], "score": float(r[5])} for r in rows]
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except Exception as e:
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logger.error(f"Hybrid search failed: {e}")
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return self._fallback_vector_search(query_vector, task_id, candidates_num)
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return {"results": results, "msg": f"Hybrid found {len(results)}"}
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def _fallback_vector_search(self, vector, task_id, limit):
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logger.warning("Fallback to pure vector search")
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with self.db.engine.connect() as conn:
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stmt = select(
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self.db.chunks.c.task_id, self.db.chunks.c.source_url, self.db.chunks.c.title,
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self.db.chunks.c.content, self.db.chunks.c.meta_info
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).order_by(self.db.chunks.c.embedding.cosine_distance(vector)).limit(limit)
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if task_id: stmt = stmt.where(self.db.chunks.c.task_id == task_id)
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rows = conn.execute(stmt).fetchall()
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return {"results": [{"content": r[3], "meta_info": r[4], "score": 0.0} for r in rows], "msg": "Fallback found"}
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data_service = DataService() |