127 lines
5.3 KiB
Python
127 lines
5.3 KiB
Python
# service.py
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from sqlalchemy import select, insert, update, delete, and_
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from .database import db_instance
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from .utils import normalize_url
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class CrawlerService:
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def __init__(self):
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self.db = db_instance
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def register_task(self, url: str):
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"""完全使用库 API 实现的注册"""
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clean_url = normalize_url(url)
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with self.db.engine.begin() as conn:
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# 使用 select() API
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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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# 使用 insert() API
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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):
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"""通用 API 实现的批量添加（含详细返回）"""
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success_urls, skipped_urls, failed_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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# 检查是否存在 (通用写法)
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check_q = select(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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)
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if conn.execute(check_q).fetchone():
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skipped_urls.append(clean_url)
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continue
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# 插入新 URL
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conn.execute(insert(self.db.queue).values(
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task_id=task_id, url=clean_url, status='pending'
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))
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success_urls.append(clean_url)
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except Exception:
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failed_urls.append(clean_url)
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return {"success_urls": success_urls, "skipped_urls": skipped_urls, "failed_urls": failed_urls}
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def get_pending_urls(self, task_id: int, limit: int):
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"""原子锁定 API 实现"""
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with self.db.engine.begin() as conn:
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query = select(self.db.queue.c.url).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)
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urls = [r[0] for r in conn.execute(query).fetchall()]
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if urls:
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upd = update(self.db.queue).where(
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and_(self.db.queue.c.task_id == task_id, self.db.queue.c.url.in_(urls))
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).values(status='processing')
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conn.execute(upd)
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return {"urls": urls}
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def save_results(self, task_id: int, results: list):
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"""通用 API 实现的 UPSERT 逻辑：区分插入、更新、失败"""
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inserted_urls, updated_urls, failed_urls = [], [], []
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with self.db.engine.begin() as conn:
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for res in results:
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# 适配 Dify 传来的字典或对象
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data = res if isinstance(res, dict) else res.__dict__
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clean_url = normalize_url(data.get('source_url'))
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c_idx = data.get('chunk_index')
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try:
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# 1. 检查是否存在该切片
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find_q = select(self.db.chunks).where(
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and_(
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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 == c_idx
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)
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)
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existing = conn.execute(find_q).fetchone()
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if existing:
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# 2. 执行更新 API
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upd = update(self.db.chunks).where(self.db.chunks.c.id == existing[0]).values(
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title=data.get('title'),
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content=data.get('content'),
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embedding=data.get('embedding')
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)
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conn.execute(upd)
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updated_urls.append(clean_url)
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else:
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# 3. 执行插入 API
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ins = insert(self.db.chunks).values(
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task_id=task_id,
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source_url=clean_url,
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chunk_index=c_idx,
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title=data.get('title'),
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content=data.get('content'),
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embedding=data.get('embedding')
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)
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conn.execute(ins)
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inserted_urls.append(clean_url)
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# 4. 更新队列状态
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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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except Exception as e:
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print(f"Error: {e}")
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failed_urls.append(clean_url)
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return {
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"inserted_urls": list(set(inserted_urls)),
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"updated_urls": list(set(updated_urls)),
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"failed_urls": failed_urls
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}
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crawler_service = CrawlerService() |