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main.py
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main.py
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# Author: Bishal Sarang
import json
import os
import pickle
import time
import bs4
import colorama
import requests
from colorama import Back, Fore
from ebooklib import epub
from selenium import webdriver
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.ui import WebDriverWait
from utils import *
import epub_writer
# Initialize Colorama
colorama.init(autoreset=True)
options = Options()
options.headless = True
# Disable Warning, Error and Info logs
# Show only fatal errors
options.add_argument("--log-level=3")
driver = webdriver.Chrome(options=options)
# Get upto which problem it is already scraped from track.conf file
completed_upto = read_tracker("track.conf")
# Load chapters list that stores chapter info
# Store chapter info
with open('chapters.pickle', 'rb') as f:
chapters = pickle.load(f)
def download(problem_num, url, title, solution_slug):
print(
Fore.BLACK + Back.CYAN + f"Fetching problem num " + Back.YELLOW + f" {problem_num} " + Back.CYAN + " with url " + Back.YELLOW + f" {url} ")
n = len(title)
try:
driver.get(url)
# Wait 20 secs or until div with id initial-loading disappears
element = WebDriverWait(driver, 30).until(
EC.visibility_of_element_located((By.CLASS_NAME, "_1l1MA")))
# Get current tab page source
html = driver.page_source
soup = bs4.BeautifulSoup(html, "html.parser")
# Construct HTML
title_decorator = '*' * n
problem_title_html = title_decorator + f'<div id="title">{title}</div>' + '\n' + title_decorator
problem_html = problem_title_html + str(
soup.find("div", {"class": "_1l1MA"})) + '<br><br><hr><br>'
# Append Contents to a HTML file
with open("out.html", "ab") as f:
f.write(problem_html.encode(encoding="utf-8"))
# create and append chapters to construct an epub
c = epub.EpubHtml(title=title, file_name=f'chap_{problem_num}.xhtml', lang='hr')
c.content = problem_html
chapters.append(c)
# Write List of chapters to pickle file
dump_chapters_to_file(chapters)
# Update upto which the problem is downloaded
update_tracker('track.conf', problem_num)
print(
Fore.BLACK + Back.GREEN + f"Writing problem num " + Back.YELLOW + f" {problem_num} " + Back.GREEN + " with url " + Back.YELLOW + f" {url} ")
print(Fore.BLACK + Back.GREEN + " successfull ")
# print(f"Writing problem num {problem_num} with url {url} successfull")
except Exception as e:
print(Back.RED + f" Failed Writing!! {e} ")
driver.quit()
def main():
MAXIMUM_NUMBER_OF_PROBLEMS_PER_INSTANCE = int(os.environ.get("MAXIMUM_NUMBER_OF_PROBLEMS", 400))
SLEEP_TIME_PER_PROBLEM_IN_SECOND = int(os.environ.get("SLEEP_TIME_PER_PROBLEM_IN_SECOND", 5))
# Leetcode API URL to get json of problems on algorithms categories
ALGORITHMS_ENDPOINT_URL = "https://leetcode.com/api/problems/algorithms/"
# Problem URL is of format ALGORITHMS_BASE_URL + question__title_slug
# If question__title_slug = "two-sum" then URL is https://leetcode.com/problems/two-sum
ALGORITHMS_BASE_URL = "https://leetcode.com/problems/"
# Load JSON from API
algorithms_problems_json = requests.get(ALGORITHMS_ENDPOINT_URL).content
algorithms_problems_json = json.loads(algorithms_problems_json)
# List to store question_title_slug
links = []
for child in algorithms_problems_json["stat_status_pairs"]:
# Only process free problems
if not child["paid_only"]:
question__title_slug = child["stat"]["question__title_slug"]
question__article__slug = child["stat"]["question__article__slug"]
question__title = child["stat"]["question__title"]
frontend_question_id = child["stat"]["frontend_question_id"]
difficulty = child["difficulty"]["level"]
links.append(
(question__title_slug, difficulty, frontend_question_id, question__title, question__article__slug))
has_new_problems = (completed_upto != len(links) - 1)
if has_new_problems:
styles_str = "<style>pre{white-space:pre-wrap;background:#f7f9fa;padding:10px 15px;color:#263238;line-height:1.6;font-size:13px;border-radius:3px margin-top: 0;margin-bottom:1em;overflow:auto}b,strong{font-weight:bolder}#title{font-size:16px;color:#212121;font-weight:600;margin-bottom:10px}hr{height:10px;border:0;box-shadow:0 10px 10px -10px #8c8b8b inset}</style>"
with open("out.html", "ab") as f:
f.write(styles_str.encode(encoding="utf-8"))
# Sort by difficulty follwed by problem id in ascending order
links = sorted(links, key=lambda x: (x[1], x[2]))
downloaded_now = 0
try:
for i in range(completed_upto + 1, len(links)):
question__title_slug, _, frontend_question_id, question__title, question__article__slug = links[i]
url = ALGORITHMS_BASE_URL + question__title_slug
title = f"{frontend_question_id}. {question__title}"
# Download each file as html and write chapter to chapters.pickle
download(i, url, title, question__article__slug)
downloaded_now += 1
if downloaded_now == MAXIMUM_NUMBER_OF_PROBLEMS_PER_INSTANCE:
break
# Sleep for 5 secs for each problem and 2 mins after every 30 problems
if i % 30 == 0:
print(f"Sleeping 120 secs\n")
time.sleep(120)
else:
print(f"Sleeping {SLEEP_TIME_PER_PROBLEM_IN_SECOND} secs\n")
time.sleep(SLEEP_TIME_PER_PROBLEM_IN_SECOND)
finally:
# Close the browser after download
driver.quit()
try:
if has_new_problems:
epub_writer.write("Leetcode Questions.epub", "Leetcode Questions", "Anonymous", chapters)
print(Back.GREEN + "All operations successful")
else:
print(Back.GREEN + "No new problems found. Exiting")
except Exception as e:
print(Back.RED + f"Error making epub {e}")
if __name__ == "__main__":
main()