Created
May 5, 2020 07:55
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Download multiple URLs simultaneously
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""" | |
A rudimentary URL downloader (like wget or curl) to demonstrate Rich progress bars. | |
SOURCE: https://github.com/willmcgugan/rich/blob/master/examples/downloader.py | |
""" | |
from concurrent.futures import ThreadPoolExecutor | |
from functools import partial | |
import os.path | |
import sys | |
from typing import Iterable | |
from urllib.request import urlopen | |
from rich.progress import ( | |
BarColumn, | |
DownloadColumn, | |
TextColumn, | |
TransferSpeedColumn, | |
TimeRemainingColumn, | |
Progress, | |
TaskID, | |
) | |
progress = Progress( | |
TextColumn("[bold blue]{task.fields[filename]}", justify="right"), | |
BarColumn(bar_width=None), | |
"[progress.percentage]{task.percentage:>3.1f}%", | |
"•", | |
DownloadColumn(), | |
"•", | |
TransferSpeedColumn(), | |
"•", | |
TimeRemainingColumn(), | |
) | |
def copy_url(task_id: TaskID, url: str, path: str) -> None: | |
"""Copy data from a url to a local file.""" | |
response = urlopen(url) | |
# This will break if the response doesn't contain content length | |
progress.update(task_id, total=int(response.info()["Content-length"])) | |
with open(path, "wb") as dest_file: | |
for data in iter(partial(response.read, 32768), b""): | |
dest_file.write(data) | |
progress.update(task_id, advance=len(data)) | |
def download(urls: Iterable[str], dest_dir: str): | |
"""Download multuple files to the given directory.""" | |
with progress: | |
with ThreadPoolExecutor(max_workers=4) as pool: | |
for url in urls: | |
filename = url.split("/")[-1] | |
dest_path = os.path.join(dest_dir, filename) | |
task_id = progress.add_task("download", filename=filename) | |
pool.submit(copy_url, task_id, url, dest_path) | |
if __name__ == "__main__": | |
# Try with https://releases.ubuntu.com/20.04/ubuntu-20.04-desktop-amd64.iso | |
if sys.argv[1:]: | |
download(sys.argv[1:], "./") | |
else: | |
print("Usage:\n\tpython downloader.py URL1 URL2 URL3 (etc)") |
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