Продолжаю изучать randomproxy (но решаю, что начинать надо с простых примеров из документации Scrapy)

Попытки выполнить код по частям привели к выводу о том, что сначала надо бы прочитать всю документацию Scrapy. Там много работающих примеров. Я еще плохо знаю Python, поэтому надо разбирать работающий код с хорошей документацией, а не ломать голову над упражнениями неизвестных авторов.

In [1]:

%load /media/usb0/w8/GitHub_2/scrapy-proxies-master/scrapy-proxies-master/README.md 

In []:

Random proxy middleware for Scrapy (http://scrapy.org/)
=======================================================

Processes Scrapy requests using a random proxy from list to avoid IP ban and
improve crawling speed.

Get your proxy list from sites like http://www.hidemyass.com/ (copy-paste into text file
and reformat to http://host:port format)

settings.py
-----------

    # Retry many times since proxies often fail
    RETRY_TIMES = 10
    # Retry on most error codes since proxies fail for different reasons
    RETRY_HTTP_CODES = [500, 503, 504, 400, 403, 404, 408]

    DOWNLOADER_MIDDLEWARES = {
        'scrapy.contrib.downloadermiddleware.retry.RetryMiddleware': 90,
        # Fix path to this module
        'yourspider.randomproxy.RandomProxy': 100,
        'scrapy.contrib.downloadermiddleware.httpproxy.HttpProxyMiddleware': 110,
    }

    # Proxy list containing entries like
    # http://host1:port
    # http://username:password@host2:port
    # http://host3:port
    # ...
    PROXY_LIST = '/path/to/proxy/list.txt'


Your spider
-----------

In each callback ensure that proxy /really/ returned your target page by
checking for site logo or some other significant element.
If not - retry request with dont_filter=True

    if not hxs.select('//get/site/logo'):
        yield Request(url=response.url, dont_filter=True)

In [2]:

%load '/media/usb0/w8/GitHub_2/scrapy-proxies-master/scrapy-proxies-master/randomproxy.py'

In []:

# Copyright (C) 2013 by Aivars Kalvans <aivars.kalvans@gmail.com>
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

import re
import random
import base64
from scrapy import log

class RandomProxy(object):
    def __init__(self, settings):
        self.proxy_list = settings.get('PROXY_LIST')
        fin = open(self.proxy_list)

        self.proxies = {}
        for line in fin.readlines():
            parts = re.match('(\w+://)(\w+:\w+@)?(.+)', line)

            # Cut trailing @
            if parts[1]:
                parts[1] = parts[1][:-1]

            self.proxies[parts[0] + parts[2]] = parts[1]

        fin.close()

    @classmethod
    def from_crawler(cls, crawler):
        return cls(crawler.settings)

    def process_request(self, request, spider):
        # Don't overwrite with a random one (server-side state for IP)
        if 'proxy' in request.meta:
            return

        proxy_address = random.choice(self.proxies.keys())
        proxy_user_pass = self.proxies[proxy_address]

        request.meta['proxy'] = proxy_address
        if proxy_user_pass:
            basic_auth = 'Basic ' + base64.encodestring(proxy_user_pass)
            request.headers['Proxy-Authorization'] = basic_auth

    def process_exception(self, request, exception, spider):
        proxy = request.meta['proxy']
        log.msg('Removing failed proxy <%s>, %d proxies left' % (
                    proxy, len(self.proxies)))
        try:
            del self.proxies[proxy]
        except ValueError:
            pass

In [3]:

import re
import random
import base64
from scrapy import log

In [4]:

fin=['http://host1:port','http://username:password@host2:port','http://host3:port']

In [6]:

proxies = {}

In [14]:

for line in fin:
            parts = re.match('(\w+://)(\w+:\w+@)?(.+)', line)
            print parts.group(0)
            print '    1=',parts.group(1)
            print '    2=',parts.group(2)

http://host1:port
    1= http://
    2= None
http://username:password@host2:port
    1= http://
    2= username:password@
http://host3:port
    1= http://
    2= None

In []:

            # Cut trailing @
            if parts[1]:
                parts[1] = parts[1][:-1]

            proxies[parts[0] + parts[2]] = parts[1]

In [15]:

import scrapy

In [19]:

help(scrapy)

Help on package scrapy:

NAME
    scrapy - Scrapy - a screen scraping framework written in Python

FILE
    /usr/lib/python2.7/dist-packages/scrapy/__init__.py

PACKAGE CONTENTS
    cmdline
    command
    commands (package)
    conf
    contrib (package)
    contrib_exp (package)
    core (package)
    crawler
    dupefilter
    exceptions
    extension
    http (package)
    interfaces
    item
    link
    linkextractor
    log
    logformatter
    mail
    middleware
    project
    resolver
    responsetypes
    selector (package)
    settings (package)
    shell
    signals
    spider
    spidermanager
    squeue
    stats
    statscol
    telnet
    tests (package)
    utils (package)
    webservice
    xlib (package)

SUBMODULES
    twisted_250_monkeypatches
    urlparse_monkeypatches

DATA
    __version__ = '0.14.4'
    optional_features = set(['boto', 'ssl'])
    version_info = (0, 14, 4)

VERSION
    0.14.4

In []:

Посты чуть ниже также могут вас заинтересовать