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import urllib
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from bs4 import BeautifulSoup
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import urlparse
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import mechanize
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import pickle
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import re
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try:
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import gevent
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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 does 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 the urls in que 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+)$'
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def set_exts(self, exts):
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self.exts = exts
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def allow_regex(self, regex=None):
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if not regex is None:
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self.allowed_regex = regex
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else:
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allowed_regex = ''
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for ext in self.exts:
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allowed_regex += '(!{})'.format(ext)
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self.allowed_regex = '\.({}\w+)$'.format(allowed_regex)
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def crawl(self, echo=False, pool_size=1):
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self.echo = echo
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self.regex = re.compile(self.allowed_regex)
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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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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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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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if not gevent_installed:
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print('{} pages parsed :: {} pages in the queue'.format(len(self.visited), len(self.urls)))
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else:
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print('{} pages parsed :: {} parsing processes :: {} pages in the queue'.format(len(self.visited), len(self.pool), len(self.urls)))
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# Set the startingpoint for the spider and initialize
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# the a mechanize browser object
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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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br = mechanize.Browser()
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try:
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response = br.open(url)
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if response.code >= 400:
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self.errlog("Error {} at url {}".format(response.code, url))
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return
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for link in br.links():
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newurl = urlparse.urljoin(link.base_url, link.url)
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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, e:
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self.errlog(e.message)
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br.close()
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del(br)
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def is_valid(self, url):
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valid = False
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if url in self.visited:
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return False
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if not self.url 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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