main.py

import threading
from queue import Queue

from pip._vendor.distlib.util import HTTPSOnlyHandler

from spider import Spider
from domain import *
from general import *

PROJECT_NAME ='programiz'
HOMEPAGE='https://www.programiz.com/'
DOMAIN_NAME = get_domain_name(HOMEPAGE)
QUEUE_FILE = PROJECT_NAME + '/queue.txt'
CRAWLED_FILE = PROJECT_NAME + '/crawled.txt'
NUMBER_OF_THREADS = 8
queue = Queue() # the thread queue, different from sites on queue
Spider(PROJECT_NAME, HOMEPAGE, DOMAIN_NAME) # the first spider jas the responsibility of makeinh files and the directory

# create worker threads (will die when main exits)
def create_workers():
    for _ in range(NUMBER_OF_THREADS):
        t = threading.Thread(target=work)
        t.daemon = True
        t.start()

# Do the next job in the queue
def work():
    while True:
        url = queue.get()
        Spider.crawl_page(threading.current_thread().name, url)
        queue.task_done()

# each queued link is a new job
def create_jobs():
    for link in file_to_set(QUEUE_FILE):
        queue.put(link)
    queue.join()
    crawl()

# check if there are items in the queue, if so crawl them
def crawl():
    queued_links = file_to_set(QUEUE_FILE)
    if len(queued_links) > 0:
        print(str(len(queued_links)) + ' links in the queue')
        create_jobs()

create_workers()
crawl()