python - Running multiple web crawlers at the same time in Django -


i created custom management command django called crawl.py

i make run 2 crawlers @ same time. crawlers each object crawl() function runs infinite loop , interacts orm.

def crawl(self):     current_page = self.start_page     while true:         page_response = requests.get('http://magdeleine.co/browse/page/{}/'.format(current_page))         page_soup = beautifulsoup(page_response.text)         image_links = [link["href"] link in page_soup.find_all('a', {'class': 'photo-link'})]           image_link in image_links:             response = requests.get(image_link)             image_page_soup = beautifulsoup(response.text)             print('getting image source link')             image_source_link = image_page_soup.find('a',{'class': 'download'})['href']              #get tags             print('getting tags')             ul = image_page_soup.find('ul', {'class': 'tags'})             tag_links = ul.find_all('a', {'rel':'tag'})             tag_names = [tag_link.string tag_link in tag_links]             try:                 tag_names.remove('editor\'s pick')             except:                 pass              if not image.objects.filter(url=image_source_link).exists():                 image = image(url=image_source_link, origin="mg")                 print('creating thumbnail')                 image.create_thumb()                 image.save()                 # or create new tag every element in list                 tag_name in tag_names:                     tag, created = tag.objects.get_or_create(name=tag_name)                     image.tags.add(tag)          current_page+=1         print("end page")

in management command

class command(basecommand):      def handle(self, *args, **options):         pexel_crawler = pexelcrawler()         pexel_crawler.crawl()          magdeleine_crawler = magdeleinecrawler()         magdeleine_crawler.crawl()

i run both .crawl() commands together. if elaborate how done in production vs development , optimal solutions this.

you should able gevent, like:

import gevent django.core.management.base import basecommand  class command(basecommand):      def handle(self, *args, **options):         pexel_crawler = pexelcrawler()         magdeleine_crawler = magdeleinecrawler()         pexel_job = gevent.spawn(pexel_crawler.crawl)         magdeleine_job = gevent.spawn(magdeleine_crawler.crawl)         gevent.joinall([pexel_job, magdeleine_job])

i believe work, , keep management command running in foreground long both crawlers running. careful though, because if works expected, infinite loop , never stop.


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