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webcrawler.py
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webcrawler.py
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from urllib.request import Request, urlopen
from requests_html import HTMLSession
from bs4 import BeautifulSoup
from fake_useragent import UserAgent
import random
import re
import os
from subprocess import Popen, PIPE
from statistics import variance, mean
from selenium import webdriver
import time
def main():
proxies = getProxies() #return a list of proxies
ct = 0 #iterator for how many pages have been attempted
proxy_ct = 0 #iterator for choosing a new proxy
found_pages = 0 #counter for number of valid webpages crawled
while (found_pages < 200): #keep crawling until 200 webpages have been found
new_proxy = False #by default, we aren't using a new proxy
this_proxy_idx = proxy_ct % (len(proxies)-1)#if you iterate through all proxies, start back at the beginning of the proxy list
if (ct % 4) == 0: #every fourth request, switch to a new proxy
proxy_ct += 1
new_proxy = True #When a new proxy is used, we need to grab a new cookie
result = getRoomPage(getPageNumbers(1)[0], proxies[this_proxy_idx], new_proxy) #create request
if (result): #result is True when a valid page has been found
found_pages += 1
time.sleep(0.15) #wait to simulate user interation, this is set very low because the curl request typically takes ~15 seconds to complete
ct += 1 #increment each time we try to get a new room page
def getProxies(): #returns a list of valid proxies in the format ["ip:port","ip:port"...]
proxies=[]
ua = UserAgent()
proxies_req = Request('https://www.sslproxies.org/')
proxies_req.add_header('User-Agent', ua.random)
proxies_doc = urlopen(proxies_req).read().decode('utf8')
soup = BeautifulSoup(proxies_doc, 'html.parser')
proxies_table = soup.find(id='proxylisttable')
for row in proxies_table.tbody.find_all('tr'):
proxies.append(row.find_all('td')[0].string + ":" + row.find_all('td')[1].string)
return proxies
def getPageNumbers(pageCount): #returns a list of random page id's between 20k and 200k. the list is of length pageCount.
page_nos=[]
for i in range(pageCount):
page_nos.append(random.randint(20000,200000))
return page_nos
#def getPageNumbersNew(pageCount): #currently incomplete method for crawling for valid page ids by analyzing vrbo's browse pages, can safely ignore.
# page_nos=[]
# options = webdriver.ChromeOptions()
# options.add_argument("--headless")
# options.add_argument("--no-sandbox")
# options.add_argument("--disabled-dev-shm-usage")
# browser = webdriver.Chrome(executable_path="./chromedriver", options=options)
# currentPage = 2
# while (len(page_nos) < pageCount):
# browser.get('https://www.vrbo.com/search/keywords:united-states/page:' + str(currentPage))
# browser.execute_script
# soup = BeautifulSoup(browser.page_source, 'html.parser')
# crawled_soup = soup.find_all(href=re.compile("pet"))
# print("found " + str(len(crawled_soup)) + " hits")
# for hit in crawled_soup:
# href = hit.get("href")
# end_of_id = href.find('?')
# page_nos.append(href[1:end_of_id])
# currentPage += 1
# time.sleep(5)
def getRoomPage(page_no, proxy_addr, new_proxy): #attempts to request a page from vrbo with a given page id (aka page_no) and using a given proxy address (aka proxy_addr). Returns True if a valid page is found, returns False otherwise
print("proxy_address: " + proxy_addr)
print("page_no: " + str(page_no))
if (new_proxy):
with open("vrbo/vrbo_" +str(page_no)+".html","wb") as output_file, open("errorFile.txt", "wb") as error_file:
p = Popen([
"curl",
"-p", proxy_addr,
"-c", "cookiefile.txt",
"-b", "cookiefile.txt",
"-L",
"-m", "15",
"-H", "Accept: application/json, text/javascript, */*; q=0.01\\",
"-H", "Accept-Encoding:",
"-H", "Connection: keep-alive\\",
"-H", "X-Requested-With: XMLHttpRequest",
"--user-agent", "Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0",
"https://www.vrbo.com/"+str(page_no)
],
stdout=PIPE, #send output to pipe
#stdout=output_file,
stderr=error_file)
print("pulling html...")
response = p.communicate()[0] #dump response into a variable
print("crawling...")
soup = BeautifulSoup(response, 'html.parser')
crawled_soup = soup.find("meta",{"property":"og:price:amount"})
print("done crawling!")
if (crawled_soup):
price = crawled_soup.get("content")
print("HEY PRICE IS " + str(price) + ". WE DID IT ! \n\n")
output_file.write(response)
return True
else:
with open("vrbo/vrbo_" +str(page_no)+".html","wb") as output_file, open("errorFile.txt", "wb") as error_file:
p = Popen([
"curl",
"-p", proxy_addr,
"-b", "cookiefile.txt",
"-L",
"-m", "15",
"-H", "Accept: application/json, text/javascript, */*; q=0.01\\",
"-H", "Accept-Encoding:",
"-H", "Connection: keep-alive\\",
"-H", "X-Requested-With: XMLHttpRequest",
"--user-agent", "Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0",
"https://www.vrbo.com/"+str(page_no)
],
stdout=PIPE,
stderr=error_file)
print("pulling html...")
response = p.communicate()[0] #dump response into a variable
print("crawling...")
soup = BeautifulSoup(response, 'html.parser')
crawled_soup = soup.find("meta",{"property":"og:price:amount"})
print("done crawling!")
if (crawled_soup):
price = crawled_soup.get("content")
print("HEY PRICE IS " + str(price) + ". WE DID IT ! \n\n")
output_file.write(response)
return True
os.remove("vrbo/vrbo_"+str(page_no)+".html")
return False
if __name__ == "__main__":
main()