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scrapper.py
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scrapper.py
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""" Note -: This Module require chromium-chrome driver to work correctly
Install using command "apt install chromium-chromedriver"
consist routines for text scrapping from websites
"""
from bs4 import BeautifulSoup
from bs4.element import Comment
from tldextract import extract
from selenium import webdriver
from timeout import Timeout
import requests
import processdata
import warnings
warnings.filterwarnings("ignore")
chrome_options = webdriver.ChromeOptions()
chrome_options.add_argument('--headless')
chrome_options.add_argument('--no-sandbox')
chrome_options.add_argument('--disable-dev-shm-usage')
browser = webdriver.Chrome('chromedriver',chrome_options=chrome_options)
browser.set_page_load_timeout(10)
headers = {
'User-Agent': 'Mozilla/75.0',
'Accept-Language': 'en-US,en;q=0.5'
}
SUFFICIENT = 50 #Minimum words require to avoid dynamic content scrapping
MINIMUM = 10 #Minimum content required
def get_status_code(url, default=0):
""" return status code of url and 0 in case of exception """
try:
with Timeout(10):
res = requests.get(url, headers=headers, verify=False, timeout=3, stream=False)
return res.status_code
except:
return default
return default
def get_valid_url(url):
""" return url with valid protocol and status_code """
if(get_status_code('https://'+url) == 200):
return {'url':'https://'+url, 'status':200}
else:
return {'url': 'http://'+url, 'status': get_status_code('http://'+url)}
def tag_visible(element):
""" check visible tag """
if element.parent.name in ['style', 'script', 'head', 'meta', '[document]']:
return False
if isinstance(element, Comment):
return False
return True
def text_from_html(html):
""" Extract visible text from html body """
soup = BeautifulSoup(html, 'html.parser')
text = soup.findAll(text=True)
visible_text = filter(tag_visible, text)
return u" ".join(t.strip() for t in visible_text)
def get_about_url(html, url):
""" return url of about page if exist """
try:
domain = extract(url).domain.lower() #fetch domain name of site
soup = BeautifulSoup(html, 'html.parser')
for link in soup.find_all('a'):
if link.get('href') != None and 'about' in link.get('href').lower() and domain in link.get('href').lower():
return link.get('href')
except:
return None
def get_static_text_content(url):
""" scrap static content form url and preprocess it """
content = []
try:
with Timeout(30):
res = requests.get(url, headers=headers, verify=False, timeout=10)
content.extend(processdata.preprocess(text_from_html(res.text)))
if len(content) > 0 and content[0] == "invalidcontentfound": return content
abt_url = get_about_url(res.text, url)
if abt_url != None:
res = requests.get(abt_url, headers=headers, verify=False, timeout=10)
content.extend(processdata.preprocess(text_from_html(res.text)))
return content
except:
return content
return content
def get_dynamic_text_content(url):
""" scrap dynamic content form url and preprocess it """
content = []
try:
browser.get(url)
content.extend(processdata.preprocess(text_from_html(browser.page_source)))
if len(content) > 0 and content[0] == "invalidcontentfound": return content
abt_url = get_about_url(browser.page_source, url)
if abt_url != None:
browser.get(abt_url)
content.extend(processdata.preprocess(text_from_html(browser.page_source)))
return content
except:
return content
def get_scrapped_text(url, dynamic):
""" scrap text content from url """
content = get_static_text_content(url)
if len(content) > 0 and content[0] == "invalidcontentfound": return []
dy_content = []
if (len(content) < SUFFICIENT and dynamic): dy_content = get_dynamic_text_content(url)
if len(dy_content) > 0 and dy_content[0] == "invalidcontentfound": dy_content = []
if len(content) >= len(dy_content): return content
else: return dy_content
def get_url_and_content(url, dynamic=True):
""" return dictionary object with url, and scrapped_content """
final_url = url
content = []
if url.startswith('http'):
content = get_scrapped_text(url, dynamic)
else:
content = get_scrapped_text('https://'+url, dynamic)
final_url = 'https://'+url
if len(content) < MINIMUM:
content = get_scrapped_text('http://'+url, dynamic)
final_url = 'http://'+url
return {'url': final_url, 'content': ' '.join(content)}
def get_text_content(url, dynamic=True):
""" params -: url -: as a string with or without http/https
Note it will find suitable protocol b/w http and https automatically if doesn't include in url
dynamic -: boolean variable to decide whether to scrap dynamic content or not
return -: string consist text content from url
or
raise exception when _i) either url is invalid/inactive
ii) site doen't hav english content
iii) failed to scrap significant amount of content
iv) sites take too long to respond """
content = get_url_and_content(url, dynamic)['content']
if len(content.split()) >= MINIMUM: return content
else: raise
def get_embedded_text_content(url, dynamic=True):
""" return embedding of text content from url """
return processdata.sent_embedding(get_text_content(url, dynamic))
def get_compressed_text_content(url, dynamic=True):
""" return compressed form of text content from url """
return processdata.compress_sentence(get_text_content(url, dynamic))
def get_all_info(url, dynamic=False):
""" Note -: keep dynamic = False, during multiprocessing
return url, compressed_content, embedding and status
use only in mass scrapping"""
default = {'status': 'failed'}
try:
with Timeout(35):
url_cont = get_url_and_content(url, dynamic)
if len(url_cont['content'].split()) < SUFFICIENT:
return default
else:
return {
'url': url_cont['url'],
'content': processdata.compress_sentence(url_cont['content']),
'embedding': processdata.stringify_sent_embedding(url_cont['content']),
'status':'success'
}
except:
return default
return default