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# -*- coding: utf-8 -*-
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import __future__
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import sys
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if sys.version_info.major == 2:
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import urlparse
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else:
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from urllib import parse as urlparse
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import requests
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from lxml import html
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import re
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import time
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try:
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import sys
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if 'threading' in sys.modules:
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del sys.modules['threading']
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print('threading module loaded before patching!')
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print('threading module deleted from sys.modules!\n')
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from gevent import monkey, pool
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monkey.patch_all()
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gevent_installed = True
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except:
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print("Gevent is not installed. Parsing process will be slower.")
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gevent_installed = False
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class Crawler:
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def __init__(self, url, outputfile='sitemap.xml', logfile='error.log', oformat='xml'):
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self.url = url
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self.logfile = open(logfile, 'a')
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self.oformat = oformat
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self.outputfile = outputfile
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# create lists for urls in queue and visited urls
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self.urls = set([url])
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self.visited = set([url])
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self.exts = ['htm', 'php']
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self.allowed_regex = '\.((?!htm)(?!php)\w+)$'
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self.errors = {'404': []}
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def set_exts(self, exts):
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self.exts = exts
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def allow_regex(self, regex=None):
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if regex is not None:
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self.allowed_regex = regex
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else:
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allowed_regex = ''
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for ext in self.exts:
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allowed_regex += '(!{})'.format(ext)
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self.allowed_regex = '\.({}\w+)$'.format(allowed_regex)
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def crawl(self, echo=False, pool_size=1):
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# sys.stdout.write('echo attribute deprecated and will be removed in future')
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self.echo = echo
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self.regex = re.compile(self.allowed_regex)
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print('Parsing pages')
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if gevent_installed and pool_size >= 1:
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self.pool = pool.Pool(pool_size)
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self.pool.spawn(self.parse_gevent)
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self.pool.join()
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else:
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self.pool = [None,] # fixing n_pool exception in self.parse with poolsize > 1 and gevent_installed == False
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while len(self.urls) > 0:
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self.parse()
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if self.oformat == 'xml':
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self.write_xml()
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elif self.oformat == 'txt':
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self.write_txt()
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with open('errors.txt', 'w') as err_file:
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for key, val in self.errors.items():
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err_file.write(u'\n\nError {}\n\n'.format(key))
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err_file.write(u'\n'.join(set(val)))
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def parse_gevent(self):
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self.parse()
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while len(self.urls) > 0 and not self.pool.full():
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self.pool.spawn(self.parse_gevent)
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def parse(self):
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if self.echo:
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n_visited, n_urls, n_pool = len(self.visited), len(self.urls), len(self.pool)
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status = (
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'{} pages parsed :: {} pages in the queue'.format(n_visited, n_urls),
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'{} pages parsed :: {} parsing processes :: {} pages in the queue'.format(n_visited, n_pool, n_urls)
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)
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print(status[int(gevent_installed)])
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if not self.urls:
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return
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else:
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url = self.urls.pop()
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try:
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response = requests.get(url)
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# if status code is not 404, then add url in seld.errors dictionary
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if response.status_code != 200:
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if self.errors.get(str(response.status_code), False):
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self.errors[str(response.status_code)].extend([url])
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else:
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self.errors.update({str(response.status_code): [url]})
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self.errlog("Error {} at url {}".format(response.status_code, url))
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return
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try:
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tree = html.fromstring(response.text)
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except ValueError as e:
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self.errlog(repr(e))
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tree = html.fromstring(response.content)
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for link_tag in tree.findall('.//a'):
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link = link_tag.attrib.get('href', '')
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newurl = urlparse.urljoin(self.url, link)
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# print(newurl)
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if self.is_valid(newurl):
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self.visited.update([newurl])
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self.urls.update([newurl])
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except Exception as e:
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self.errlog(repr(e))
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def is_valid(self, url):
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oldurl = url
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if '#' in url:
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url = url[:url.find('#')]
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if url in self.visited or oldurl in self.visited:
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return False
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if self.url not in url:
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return False
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if re.search(self.regex, url):
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return False
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return True
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def errlog(self, msg):
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self.logfile.write(msg)
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self.logfile.write('\n')
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def write_xml(self):
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of = open(self.outputfile, 'w')
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of.write('<?xml version="1.0" encoding="utf-8"?>\n')
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of.write('<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">\n')
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url_str = '<url><loc>{}</loc></url>\n'
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while self.visited:
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of.write(url_str.format(self.visited.pop()))
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of.write('</urlset>')
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of.close()
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def write_txt(self):
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of = open(self.outputfile, 'w')
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url_str = u'{}\n'
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while self.visited:
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of.write(url_str.format(self.visited.pop()))
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of.close()
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def show_progress(self, count, total, status=''):
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bar_len = 60
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filled_len = int(round(bar_len * count / float(total)))
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percents = round(100.0 * count / float(total), 1)
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bar = '=' * filled_len + '-' * (bar_len - filled_len)
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sys.stdout.write('[%s] %s%s ...%s\r' % (bar, percents, '%', status))
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sys.stdout.flush() # As suggested by Rom Ruben (see: http://stackoverflow.com/questions/3173320/text-progress-bar-in-the-console/27871113#comment50529068_27871113)
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time.sleep(0.5)
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