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poem_fetcher.py
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poem_fetcher.py
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import argparse
import concurrent.futures
import hashlib
import logging
import random
from crawler.crawler import UrlCrawler
from db.url_db import UrlDb
from url_parser.url_parser import UrlParser
class CrawlDriver:
_db = None
_base_url = None
_parser = None
_crawler = None
_max_urls_to_process = 0
_urls_processed = 0
_content_fetched_urls = 0
_only_base_domain_urls = False
_dropped_urls = 0
_total_visited = 0
_no_contents = 0
def __init__(self, flags):
self._db = UrlDb(flags['db_path'])
self._crawler = UrlCrawler(flags['base_domain'])
self._parser = UrlParser()
self._base_url = flags['base_domain']
self._max_urls_to_process = flags['max_urls_to_process']
self._only_base_domain_urls = flags['only_include_base_domain_urls']
# We start with the base_url as the base crawl point and go from there
# Steps in the flow
# a. Start from a base url
# b. Fetch the url, update it in the Db
# c. Get all the links from the page and insert all of them
# in the db (which do not already exist and matches the base domain)
# d. Read the db and fetch more
def run(self):
logging.info("Total URLs in the DB: %d", self._db.get_total_seen())
urls = [self._base_url]
if not self._db.is_seen(self._base_url):
self._db.add_seen_url(self._base_url)
num_new = 0
while len(
urls) > 0 and self._urls_processed < self._max_urls_to_process:
for u in urls:
if self._urls_processed > self._max_urls_to_process:
logging.debug("Max number of URLs processed. Skipping.")
break
num_new += self._process_url(u)
urls = self._get_seen_urls(100)
random.shuffle(urls)
logging.info("Total URLs in the DB: %d", self._db.get_total_seen())
print("Total visited: ", self._total_visited, ", num new urls found: ",
num_new, " num fetched: ", self._content_fetched_urls,
", no contents: ", self._no_contents)
def _process_url(self, url):
self._total_visited += 1
url = self._crawler.canonicalize_url(url)
logging.info("Processing url: %s", url)
# TODO: This should check for the time when this was crawled eg. is_recently_crawled(url)
if not self._should_crawl_url(url) or self._db.is_crawled(
url) or self._db.is_forbidden(url):
logging.debug("Url crawled or invalid. Skipping.")
return 0
if not self._crawler.fetch(url) or self._crawler.get_contents() == '':
logging.info("Could not fetch base url: %s", url)
if self._db.remove_from_seen(url):
self._dropped_urls += 1
self._db.add_forbidden_url(url)
return 0
# If this was a redirect, then set to the actual url and add this to the seen table, if eligible
if self._crawler.is_redirect():
url = self._crawler.canonicalize_url(
self._crawler.get_fetched_url())
if self._only_base_domain_urls is False or self._crawler.is_from_base_domain(
url):
if not self._db.is_seen(url):
self._db.add_seen_url(url)
else:
logging.debug("Skipping a non domain redirect url: ", url)
return 0
self._parser.set_data(self._crawler.get_contents())
# If fails, it's not a critical error to stop processing
if not self._db.add_crawled_url(url):
logging.critical("Adding %s to crawled db failed: ", url)
# Update the db with the contents of this url.
# If the URL is empty contents then skip it and add to forbidden
if self._process_content(url) is None:
logging.debug("Page is empty. Skipping collecting links.")
self._db.add_forbidden_url(url)
return 0
# Counting a url which wasn't empty as processing it.
self._urls_processed += 1
return self._add_new_seen_urls()
def _process_content(self, url):
assert not self._db.is_content_fetched(url), url
no_content = self._parser.find_element('div', 'class', 'noarticletext')
if no_content is not None:
self._no_contents += 1
return None
heading = self._parser.find_element('h1', 'class', 'firstHeading')
poem = self._parser.find_element('div', 'class', 'poem')
if heading is None or poem is None or len(heading) == 0 or len(
poem) == 0:
logging.debug("Partial content. Skipping adding %s", url)
return False
heading = self._parser.sanitize_text(heading)
poem = self._parser.sanitize_text(poem)
headingHash = hashlib.md5(heading.encode()).hexdigest()
poemHash = hashlib.md5(poem.encode()).hexdigest()
self._db.add_fetched_content(url, heading, headingHash, poem, poemHash)
self._content_fetched_urls += 1
return True
def _get_seen_urls(self, num_to_fetch=10):
return self._db.read_from_seen(max_to_fetch=num_to_fetch,
order="random")
# Static set of rules for some urls which need not be crawled.
@staticmethod
def _should_crawl_url(url):
# TODO: Make these comparisons case insensitive
return url.count(":Random") == 0 and url.count(
"MobileEditor"
) == 0 and url.count("&printable") == 0 and url.count(
"oldid") == 0 and url.count("&search=") == 0 and url.count(
"&limit=") == 0 and url.count("action=") == 0 and url.count(
"mobileaction"
) == 0 and url.count("returnto") == 0 and url.count(
"RecentChangesLinked"
) == 0 and url.count("otherapps") == 0 and url.count(
"hidelinks"
) == 0 and url.count("hideredirs") == 0 and not url.startswith(
"http://kavitakosh.org/share") and not url.startswith(
"http://kavitakosh.org/kk/images")
def _add_new_seen_urls(self):
a_tags = self._parser.find_all("a")
logging.debug("All href links in the page %d", len(a_tags))
num_new = 0
for a_tag in a_tags:
if a_tag.has_attr('href'):
url = self._crawler.canonicalize_url(a_tag['href'])
if self._should_crawl_url(url) and (
self._only_base_domain_urls is False
or self._crawler.is_from_base_domain(url)
) and not self._db.is_seen(url) and not self._db.is_forbidden(
url):
self._db.add_seen_url(url)
num_new += 1
logging.debug("Number of new URLs found: %s", num_new)
return num_new
# Sets the global logging config
def SetupLogger(flags):
logging.basicConfig(format='%(asctime)s,%(msecs)d %(levelname)-8s '
'[%(filename)s:%(lineno)d] %(message)s',
datefmt='%Y-%m-%d:%H:%M:%S',
level=flags['log'])
# Returns a dict of all parsed flags.
def ProcessArgs():
parser = argparse.ArgumentParser(
description='Crawl and process hindi poems')
parser.add_argument('--max_urls_to_process',
help='Maximum number of urls to visit',
type=int,
required=True)
parser.add_argument('--db_path',
help='Path to the DB',
type=str,
default='kavita_kosh2.db',
required=False)
parser.add_argument('--base_domain',
help='Base domain to start crawl',
type=str,
default='http://kavitakosh.org',
required=False)
parser.add_argument('--log',
help='logging level',
type=str,
default="WARNING") # NOTSET
parser.add_argument(
'--only_include_base_domain_urls',
help='Only crawl and process URLs from the base domain.',
type=int,
choices=[0, 1],
default=1,
required=False)
parser.add_argument(
"--reset_tables",
help='Reset tables before starting run',
type=int,
default=0,
choices=[0, 1], # 0 = false, 1 = true
required=False)
parser.add_argument('--num_threads',
help='Number of threads',
type=int,
default=1)
args = parser.parse_args()
flags = vars(args)
if flags['reset_tables'] == 1:
flags['reset_tables'] = True
else:
flags['reset_tables'] = False
if flags['only_include_base_domain_urls'] == 1:
flags['only_include_base_domain_urls'] = True
else:
flags['only_include_base_domain_urls'] = False
return flags
def MakeAndCallDriver(flags):
driver = CrawlDriver(flags)
driver.run()
def main():
flags = ProcessArgs()
print("Flags passed: ", flags)
SetupLogger(flags)
print("We are starting to crawl ", flags['base_domain'])
print("We are using", flags['db_path'],
" as the db to store our information.")
if flags['reset_tables'] is True:
db = UrlDb(flags['db_path'])
assert db.reset_tables()
flags['max_urls_to_process'] = flags['max_urls_to_process'] / flags[
'num_threads'] + 1
executor = concurrent.futures.ThreadPoolExecutor()
results = []
for t in range(flags['num_threads']):
results.append(executor.submit(MakeAndCallDriver, flags))
print("Started ", t, "th thread.")
print("Waiting for completion")
executor.shutdown(wait=True)
if __name__ == "__main__":
main()