CommonCrawl_URL_Processor/warc_wat_url_processor.py

import os
import gzip
import re
import traceback
from concurrent.futures import ProcessPoolExecutor, as_completed, wait
import subprocess

def extract_urls_from_file(file_path):
    urls = []
    try:
        with gzip.open(file_path, 'rt', encoding='latin-1') as file:
            for line in file:
                url_pattern = re.compile(r'http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+')
                line_urls = re.findall(url_pattern, line)
                urls.extend(line_urls)
    except (gzip.BadGzipFile, EOFError) as e:
        print(f"Error while reading the compressed file '{file_path}': {e}")
    except Exception as e:
        print(f"An unexpected error occurred while processing '{file_path}': {e}")
        print("Full traceback:")
        traceback.print_exc()

    return urls

def process_file(file_path):
    try:
        print(f"Processing file: {file_path}")

        # Extract URLs from the gzipped file
        urls = extract_urls_from_file(file_path)

        # Create the output file path with '_urls.txt' extension
        output_file_path = os.path.splitext(file_path)[0] + '_urls.txt'
        print(f"Output file path: {output_file_path}")

        # Write the URLs to the output file
        with open(output_file_path, 'w') as output_file:
            output_file.write('\n'.join(urls))
        print(f"URLs written to {output_file_path}")

        # Use zstd command-line tool for compression
        compressed_file_path = f'{output_file_path}.zst'
        command_compress = f'zstd -T0 -12 --long {output_file_path} -o {compressed_file_path}'

        # Run the compression command synchronously and wait for it to complete
        compression_process = subprocess.Popen(command_compress, shell=True)
        compression_process.communicate()

        print(f"Compressed file saved as '{compressed_file_path}'")

        # Remove the original gzipped file
        os.remove(file_path)
        print(f"Original file removed: {file_path}")

        # Remove the original _urls.txt file
        os.remove(output_file_path)
        print(f"Original file removed: {output_file_path}")

        # Remove the line containing the filename (without "_urls.txt") from urls_to_download.txt
        filename = os.path.basename(output_file_path).replace('_urls.txt', '')
        command = f'sed -i "/{filename}/d" "urls_to_download.txt"'
        if subprocess.run(command, shell=True).returncode == 0:
            print(f"File {filename} has been successfully removed from urls_to_download.txt")
            with open('urls_to_download.txt', 'r') as file:
                remaining_count = sum(1 for line in file)
            print(f"URLs remaining to be processed: {remaining_count}")
        else:
            print(f"Failed to remove {filename} from urls_to_download.txt")

    except Exception as e:
        print(f"Error during processing {file_path}: {e}")
        traceback.print_exc()

def download_and_process_file(url):
    try:
        command = f'axel -n 4 {url}'
        subprocess.run(command, shell=True)
        file_path = os.path.join(os.getcwd(), os.path.basename(url))
        process_file(file_path)
    except Exception as e:
        print(f"Error during download and processing {url}: {e}")

def main():
    with open('urls_to_download.txt', 'r') as file:
        urls = file.readlines()

    urls = [url.strip() for url in urls]

    download_concurrency_level = 4

    # Start downloading and processing files in parallel
    with ProcessPoolExecutor(max_workers=download_concurrency_level) as executor:
        futures = [executor.submit(download_and_process_file, url) for url in urls]

        # Wait for all downloads and processing to complete before starting the next iteration
        wait(futures)

if __name__ == "__main__":
    main()