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| import httpx
import threading
from urllib.request import getproxies
from concurrent.futures import ThreadPoolExecutor, wait, ALL_COMPLETED
from rich.progress import BarColumn, DownloadColumn, Progress, TextColumn, TimeRemainingColumn, TransferSpeedColumn
from rich.console import Console
from typing import Union, Tuple, Dict
import os
import re
import hashlib
import shutil
def parse_filename_from_url(url: str) -> Union[str, None]:
match = re.search(r'/([^/]+\.\w+)(?:\?.*)?$', url)
if match:
return match.group(1)
else:
return None
def md5_encrypt(text: str) -> str:
md5 = hashlib.md5()
md5.update(text.encode('utf-8'))
return md5.hexdigest()
class Downloader:
def __init__(
self, url: str,
n_workers: int = 8,
dest_dir: str = "./",
filename: Union[str, None] = None,
headers: Union[Dict, None] = None,
proxy: Union[str, None] = None,
**other_http_params
):
self.url = url
self.n_workers = n_workers
self.dest_dir = dest_dir
if filename is None:
filename = parse_filename_from_url(self.url)
if filename is None:
filename = md5_encrypt(self.url) + ".bin"
self.filename = filename
if headers is None:
headers = {
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) "
"Chrome/102.0.0.0 Safari/537.36",
}
self.headers = headers
if proxy is None:
proxy = getproxies().get("http")
self.proxy = proxy
self.other_http_params = other_http_params
self.lock = threading.Lock()
self.console = Console()
self.progress = Progress(
TextColumn("[bold blue]Downloading[/bold blue]", justify="right"),
BarColumn(bar_width=None),
"[progress.percentage]{task.percentage:>3.1f}%",
"•",
DownloadColumn(),
"•",
TransferSpeedColumn(),
"•",
TimeRemainingColumn(),
)
self.task = None
def download_chunk(self, headers: Dict[str, str], path: Union[None, str] = None) -> Union[None, bytes]:
if path is not None:
with httpx.stream(
"GET", self.url, headers=headers, proxy=self.proxy,
follow_redirects=True, timeout=30, **self.other_http_params
) as r:
with open(path, "wb") as dest_file:
for data in r.iter_bytes():
dest_file.write(data)
with self.lock:
self.progress.update(self.task, advance=len(data))
return None
else:
content = b''
with httpx.stream(
"GET", self.url, headers=headers, proxy=self.proxy,
follow_redirects=True, timeout=30, **self.other_http_params
) as r:
for data in r.iter_bytes():
content += data
with self.lock:
self.progress.update(self.task, advance=len(data))
return content
def download(self):
response = httpx.head(
self.url, headers=self.headers, proxy=self.proxy,
follow_redirects=True, timeout=30, **self.other_http_params
)
total_size = int(response.headers['Content-Length'])
if (
"Accept-Ranges" in response.headers and
response.headers["Accept-Ranges"].lower() == "bytes" and
total_size > 10 * 1024 * 1024
):
chunk_size = total_size // self.n_workers
splits = (
[(0, chunk_size)] +
[(i * chunk_size + 1, (i + 1) * chunk_size) for i in range(1, self.n_workers-1)] +
[(chunk_size * (self.n_workers-1) + 1, total_size)]
)
if total_size > 100 * 1024 * 1024:
with self.progress:
self.task = self.progress.add_task("download", total=total_size, filename=self.filename)
with ThreadPoolExecutor(max_workers=self.n_workers) as pool:
all_task = [
pool.submit(
self.download_chunk,
self.add_range(split),
os.path.join(self.dest_dir, f"{self.filename}_{i}")
) for (i, split) in enumerate(splits)
]
wait(all_task, return_when=ALL_COMPLETED)
with open(os.path.join(self.dest_dir, self.filename), "wb") as concatenated_file:
for i in range(self.n_workers):
with open(os.path.join(self.dest_dir, f"{self.filename}_{i}"), "rb") as file:
shutil.copyfileobj(file, concatenated_file)
os.remove(os.path.join(self.dest_dir, f"{self.filename}_{i}"))
else:
with self.progress:
self.task = self.progress.add_task("download", total=total_size, filename=self.filename)
with ThreadPoolExecutor(max_workers=self.n_workers) as pool:
all_task = [pool.submit(self.download_chunk, self.add_range(split), None) for split in splits]
content = b''
for task in all_task:
content += task.result()
with open(os.path.join(self.dest_dir, self.filename), "wb") as f:
f.write(content)
else:
with self.progress:
self.task = self.progress.add_task("download", total=total_size, filename=self.filename)
self.download_chunk(self.headers, os.path.join(self.dest_dir, self.filename))
def add_range(self, split: Tuple[int, int]) -> Dict[str, str]:
headers = self.headers.copy()
headers["Range"] = f"bytes={split[0]}-{split[1]}"
return headers
|