import os import argparse import requests import logging from concurrent.futures import ThreadPoolExecutor, as_completed from tqdm import tqdm import re

可配置参数

CONFIG = { 'transmission_port': 9091, 'default_threads': 4, }

def check_dir(path): if not os.path.exists(path): os.makedirs(path) elif not os.path.isdir(path): raise argparse.ArgumentTypeError(f'{path} is not a directory') return path

def check_url(url): pattern = r'^https?://|^ftp://|^magnet:' if not re.match(pattern, url): raise argparse.ArgumentTypeError(f'{url} is not a valid url') return url

def download_file(url, filename, num_threads): response = requests.head(url) size = int(response.headers.get('Content-Length')) if size is None: logging.warning(f'无法获取文件大小，将直接下载整个文件: {url}') download_all(url, filename) return chunk_size = int(size / num_threads) + 1

with open(filename, 'wb') as f:
    with tqdm(total=size, unit='B', unit_scale=True, desc=os.path.basename(filename), ncols=80, position=0) as bar:
        start_time = time.time()
        futures = []
        for i in range(num_threads):
            start = i * chunk_size
            end = min(start + chunk_size, size)
            futures.append((url, start, end, f, bar))

        with ThreadPoolExecutor(max_workers=num_threads) as executor:
            for future in as_completed(executor.submit(download_range, *future) for future in futures):
                try:
                    future.result()
                except Exception as e:
                    logging.error(f'Download failed: {e}')

        end_time = time.time()
        download_speed = size / (end_time - start_time) / 1024 / 1024
        logging.info(f'Download completed: {filename}, speed: {download_speed:.2f} MB/s')

def download_range(url, start, end, fileobj, bar): headers = {'Range': f'bytes={start}-{end-1}'}
with requests.get(url, headers=headers, stream=True) as response: for chunk in response.iter_content(chunk_size=1024): if chunk: fileobj.write(chunk) bar.update(len(chunk))

def download_all(url, filename): with open(filename, 'wb') as f: with requests.get(url, stream=True) as response: for chunk in response.iter_content(chunk_size=1024): if chunk: f.write(chunk) logging.info(f'Download completed: {filename}')

def download_ftp(url, filename, num_threads): import ftplib try: ftp = ftplib.FTP(url.split('//')[1].split('/')[0]) ftp.login() ftp.cwd(url.split('//')[1].split('/')[1]) ftp.retrbinary(f'RETR {url.split('/')[-1]}', open(filename, 'wb').write) logging.info(f'Download completed: {filename}') except Exception as e: logging.error(f'FTP Download failed: {e}') # 处理错误，例如重试下载或者暂停下载

def download_torrent(magnet, filename): import transmissionrpc tc = transmissionrpc.Client('localhost', port=CONFIG['transmission_port']) tc.add_torrent(magnet, download_dir=os.path.dirname(filename)) logging.info(f'Download started: {filename}')

def main(): parser = argparse.ArgumentParser(description='A command-line tool for downloading files.') parser.add_argument('-u', '--url', metavar='', type=check_url, required=True, help='download url') parser.add_argument('-o', '--output', metavar='', type=str, required=True, help='output filename') parser.add_argument('-t', '--threads', metavar='<NUM_THREADS>', type=int, default=CONFIG['default_threads'], help='number of threads for downloading') parser.add_argument('-d', '--dir', metavar='', type=check_dir, default='.', help='output directory') args = parser.parse_args() url, filename, num_threads, output_dir = args.url, args.output, args.threads, args.dir

filename = os.path.join(output_dir, filename)
if os.path.isfile(filename):
    i = 1
    while True:
        new_filename = f'{os.path.splitext(filename)[0]}_{i}{os.path.splitext(filename)[1]}'
        if not os.path.isfile(new_filename):
            filename = new_filename
            break
        i += 1

if url.startswith('http'):
    download_file(url, filename, num_threads)
elif url.startswith('ftp'):
    download_ftp(url, filename, num_threads)
elif url.startswith('magnet'):
    download_torrent(url, filename)

if name == 'main': logging.basicConfig(level=logging.INFO, format='%(asctime)s %(levelname)s: %(message)s', datefmt='%Y-%m-%d %H:%M:%S') main