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