如何编写一个通过socksipy发出请求的scrapy的DownloadHandler？

Question

我正试图在Tor上使用scrapy.我一直试图了解如何编写一个使用socksipy连接的scrapy的DownloadHandler.

Scrapy的HTTP11DownloadHandler在这里:https://github.com/scrapy/scrapy/blob/master/scrapy/core/downloader/handlers/http11.py

以下是创建自定义下载处理程序的示例:https: //github.com/scrapinghub/scrapyjs/blob/master/scrapyjs/dhandler.py

以下是创建SocksiPyConnection类的代码:http://blog.databigbang.com/distributed-scraping-with-multiple-tor-circuits/

class SocksiPyConnection(httplib.HTTPConnection):
    def __init__(self, proxytype, proxyaddr, proxyport = None, rdns = True, username = None, password = None, *args, **kwargs):
        self.proxyargs = (proxytype, proxyaddr, proxyport, rdns, username, password)
        httplib.HTTPConnection.__init__(self, *args, **kwargs)

    def connect(self):
        self.sock = socks.socksocket()
        self.sock.setproxy(*self.proxyargs)
        if isinstance(self.timeout, float):
            self.sock.settimeout(self.timeout)
        self.sock.connect((self.host, self.port))

由于scrapy代码中扭曲反应器的复杂性,我无法弄清楚插件是如何插入它的.有什么想法吗？

请不要使用类似于privxy的替代方案或回复说"scrapy不能与socks代理一起使用" - 我知道这就是为什么我正在尝试编写一个使用socksipy发出请求的自定义Downloader.

Answer 1

我能够使用https://github.com/habnabit/txsocksx完成这项工作.

做了之后pip install txsocksx,我需要更换scrapy的ScrapyAgent使用txsocksx.http.SOCKS5Agent.

我只是复制代码HTTP11DownloadHandler,并ScrapyAgent从scrapy/core/downloader/handlers/http.py,子类他们写了这样的代码:

class TorProxyDownloadHandler(HTTP11DownloadHandler):

    def download_request(self, request, spider):
        """Return a deferred for the HTTP download"""
        agent = ScrapyTorAgent(contextFactory=self._contextFactory, pool=self._pool)
        return agent.download_request(request)


class ScrapyTorAgent(ScrapyAgent):
    def _get_agent(self, request, timeout):
        bindaddress = request.meta.get('bindaddress') or self._bindAddress
        proxy = request.meta.get('proxy')
        if proxy:
            _, _, proxyHost, proxyPort, proxyParams = _parse(proxy)
            scheme = _parse(request.url)[0]
            omitConnectTunnel = proxyParams.find('noconnect') >= 0
            if  scheme == 'https' and not omitConnectTunnel:
                proxyConf = (proxyHost, proxyPort,
                             request.headers.get('Proxy-Authorization', None))
                return self._TunnelingAgent(reactor, proxyConf,
                    contextFactory=self._contextFactory, connectTimeout=timeout,
                    bindAddress=bindaddress, pool=self._pool)
            else:
                _, _, host, port, proxyParams = _parse(request.url)
                proxyEndpoint = TCP4ClientEndpoint(reactor, proxyHost, proxyPort,
                    timeout=timeout, bindAddress=bindaddress)
                agent = SOCKS5Agent(reactor, proxyEndpoint=proxyEndpoint)
                return agent

        return self._Agent(reactor, contextFactory=self._contextFactory,
            connectTimeout=timeout, bindAddress=bindaddress, pool=self._pool)

在settings.py中,需要这样的东西:

DOWNLOAD_HANDLERS = {
    'http': 'crawler.http.TorProxyDownloadHandler'
}

现在通过像Tor这样的袜子代理工作代理Scrapy.