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agua199408
V2EX  ›  数据库

Github 上代理池项目 IPProxyPool 运行时出现的一个错误

  •  
  •   agua199408 · 2017-03-29 22:27:17 +08:00 · 925 次点击
    这是一个创建于 2794 天前的主题,其中的信息可能已经有所发展或是发生改变。

    我在用Github 一个开源代理池项目 运行的过程中,在某些情况下会出现以下错误:

    Traceback (most recent call last):
      File "E:\proxy\IPProxyPool\spider\HtmlDownloader.py", line 18, in download
        r = requests.get(url=url, headers=config.get_header(), timeout=config.TIMEOUT)
      File "D:\anaconda\lib\site-packages\requests\api.py", line 70, in get
        return request('get', url, params=params, **kwargs)
      File "D:\anaconda\lib\site-packages\requests\api.py", line 56, in request
        return session.request(method=method, url=url, **kwargs)
      File "D:\anaconda\lib\site-packages\requests\sessions.py", line 488, in request
        resp = self.send(prep, **send_kwargs)
      File "D:\anaconda\lib\site-packages\requests\sessions.py", line 609, in send
        r = adapter.send(request, **kwargs)
      File "D:\anaconda\lib\site-packages\requests\adapters.py", line 479, in send
        raise ConnectTimeout(e, request=request)
    requests.exceptions.ConnectTimeout: HTTPSConnectionPool(host='proxy-list.org', port=443): Max retrie
    s exceeded with url: /english/index.php?p=9 (Caused by ConnectTimeoutError(<requests.packages.urllib
    3.connection.VerifiedHTTPSConnection object at 0x0000000006B95390>, 'Connection to proxy-list.org ti
    med out. (connect timeout=5)'))
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "D:\anaconda\lib\site-packages\sqlalchemy\engine\base.py", line 1139, in _execute_context
        context)
      File "D:\anaconda\lib\site-packages\sqlalchemy\engine\default.py", line 450, in do_execute
        cursor.execute(statement, parameters)
    sqlite3.OperationalError: database is locked
    
    The above exception was the direct cause of the following exception:
    
    Traceback (most recent call last):
      File "D:\anaconda\lib\multiprocessing\process.py", line 249, in _bootstrap
        self.run()
      File "D:\anaconda\lib\multiprocessing\process.py", line 93, in run
        self._target(*self._args, **self._kwargs)
      File "E:\proxy\IPProxyPool\spider\ProxyCrawl.py", line 26, in startProxyCrawl
        crawl.run()
      File "E:\proxy\IPProxyPool\spider\ProxyCrawl.py", line 56, in run
        self.crawl_pool.map(self.crawl, parserList)
      File "D:\anaconda\lib\site-packages\gevent\pool.py", line 308, in map
        return list(self.imap(func, iterable))
      File "D:\anaconda\lib\site-packages\gevent\pool.py", line 102, in next
        raise value.exc
      File "D:\anaconda\lib\site-packages\gevent\greenlet.py", line 534, in run
        result = self._run(*self.args, **self.kwargs)
      File "E:\proxy\IPProxyPool\spider\ProxyCrawl.py", line 67, in crawl
        response = Html_Downloader.download(url)
      File "E:\proxy\IPProxyPool\spider\HtmlDownloader.py", line 27, in download
        proxylist = sqlhelper.select(10)
      File "E:\proxy\IPProxyPool\db\SqlHelper.py", line 127, in select
        return query.order_by(Proxy.score.desc(), Proxy.speed).limit(count).all()
      File "D:\anaconda\lib\site-packages\sqlalchemy\orm\query.py", line 2613, in all
        return list(self)
      File "D:\anaconda\lib\site-packages\sqlalchemy\orm\query.py", line 2761, in __iter__
        return self._execute_and_instances(context)
      File "D:\anaconda\lib\site-packages\sqlalchemy\orm\query.py", line 2776, in _execute_and_instances
    
        result = conn.execute(querycontext.statement, self._params)
      File "D:\anaconda\lib\site-packages\sqlalchemy\engine\base.py", line 914, in execute
        return meth(self, multiparams, params)
      File "D:\anaconda\lib\site-packages\sqlalchemy\sql\elements.py", line 323, in _execute_on_connecti
    on
        return connection._execute_clauseelement(self, multiparams, params)
      File "D:\anaconda\lib\site-packages\sqlalchemy\engine\base.py", line 1010, in _execute_clauseeleme
    nt
        compiled_sql, distilled_params
      File "D:\anaconda\lib\site-packages\sqlalchemy\engine\base.py", line 1146, in _execute_context
        context)
      File "D:\anaconda\lib\site-packages\sqlalchemy\engine\base.py", line 1341, in _handle_dbapi_except
    ion
        exc_info
      File "D:\anaconda\lib\site-packages\sqlalchemy\util\compat.py", line 202, in raise_from_cause
        reraise(type(exception), exception, tb=exc_tb, cause=cause)
      File "D:\anaconda\lib\site-packages\sqlalchemy\util\compat.py", line 185, in reraise
        raise value.with_traceback(tb)
      File "D:\anaconda\lib\site-packages\sqlalchemy\engine\base.py", line 1139, in _execute_context
        context)
      File "D:\anaconda\lib\site-packages\sqlalchemy\engine\default.py", line 450, in do_execute
        cursor.execute(statement, parameters)
    sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) database is locked [SQL: 'SELECT proxys.
    ip AS proxys_ip, proxys.port AS proxys_port, proxys.score AS proxys_score \nFROM proxys ORDER BY pro
    xys.score DESC, proxys.speed\n LIMIT ? OFFSET ?'] [parameters: (10, 0)]
    

    在 stackoverflow 看到以下解答:

    SQLite locks the database when a write is made to it, such as when an UPDATE, INSERT or DELETE is sent. When using the ORM, these get sent on flush. The database will remain locked until there is a COMMIT or ROLLBACK.

    结合上面的报错,我估计错误是这样产生的: 程序正在抓取过程中,爬到的代理都 send 到了 flush ,此时连接超时,程序来到HtmlDownloader.py文件的 27 行又开始调用数据库命令,从而引发了错误。

    然而我技术很菜,研究了很久也不知道怎么改好,希望大神帮忙分析分析,谢谢!

    2 条回复    2017-03-30 00:13:03 +08:00
    xrlin
        1
    xrlin  
       2017-03-29 23:27:43 +08:00 via iPhone
    反映给作者吧,作者更新效率挺高的。
    agua199408
        2
    agua199408  
    OP
       2017-03-30 00:13:03 +08:00
    @xrlin 嗯,已经提交了 issue
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