91 lines
3.5 KiB
Python
91 lines
3.5 KiB
Python
from sqlalchemy import select, update, and_
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from sqlalchemy.dialects.postgresql import insert as pg_insert
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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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"""注册新任务并初始化队列"""
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clean_url = normalize_url(url)
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with self.db.engine.begin() as conn:
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# 1. 查重
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find_stmt = select(self.db.tasks.c.id).where(self.db.tasks.c.root_url == clean_url)
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existing = conn.execute(find_stmt).fetchone()
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if existing:
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return {"task_id": existing[0], "is_new_task": False}
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# 2. 插入新任务
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new_task = conn.execute(
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pg_insert(self.db.tasks).values(root_url=clean_url).returning(self.db.tasks.c.id)
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).fetchone()
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task_id = new_task[0]
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# 3. 初始化首个 URL 到队列
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conn.execute(
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pg_insert(self.db.queue).values(task_id=task_id, url=clean_url, status='pending')
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)
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return {"task_id": task_id, "is_new_task": True}
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def add_urls(self, task_id: int, urls: list):
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"""批量存入新发现的待处理 URL（自动去重）"""
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added_count = 0
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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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stmt = pg_insert(self.db.queue).values(
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task_id=task_id,
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url=clean_url,
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status='pending'
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).on_conflict_do_nothing(index_elements=['task_id', 'url'])
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res = conn.execute(stmt)
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if res.rowcount > 0:
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added_count += 1
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return {"added_count": added_count}
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def get_pending_urls(self, task_id: int, limit: int):
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"""原子化获取待处理 URL 并锁定"""
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with self.db.engine.begin() as conn:
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stmt = 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(stmt).fetchall()]
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if urls:
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conn.execute(
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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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)
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return {"urls": urls}
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def save_results(self, task_id: int, results: list):
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"""保存正文、向量并闭环队列状态"""
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with self.db.engine.begin() as conn:
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for res in results:
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clean_url = normalize_url(res.url)
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# 存入数据
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conn.execute(
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pg_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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title=res.title,
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content=res.content,
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embedding=res.embedding
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)
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)
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# 更新状态
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conn.execute(
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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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)
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return {"inserted": len(results)}
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# 全局单例
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crawler_service = CrawlerService() |