This Python class implements a download client that can pause and resume downloads, which is essential for large files or unstable networks. It uses the requests library to stream data and os to manage file states.
import os
import requests
from typing import Optional
class ResumableDownloader:
def init(self, url: str, file_path: str, chunk_size: int = 1024):
"""
Initialize the downloader.
:param url: The source URL of the file.
:param file_path: The local path where the file will be saved.
:param chunk_size: Size of chunks to read/write during download.
"""
self.url = url
self.file_path = file_path
self.chunk_size = chunk_size
self.temp_path = f"file_path.temp"
def _get_existing_size(self) -> int:
"""Check if a partial download exists and return its size."""
if os.path.exists(self.temp_path):
return os.path.getsize(self.temp_path)
return 0
def download(self) -> bool:
"""
Perform the download. Supports resuming if the server supports range requests.
Returns True if successful, False otherwise.
"""
existing_size = self._get_existing_size()
headers = {}
# If partial file exists, set the Range header to resume
if existing_size > 0:
headers['Range'] = f'bytes=existing_size-'
print(f"Resuming download from byte existing_size...")
else:
print("Starting new download...")
try:
with requests.get(self.url, headers=headers, stream=True, timeout=10) as r:
r.raise_for_status()
# Determine total size (for progress calculation)
total_size = int(r.headers.get('content-length', 0))
if existing_size > 0:
total_size += existing_size
# Open file in append mode if resuming, otherwise write mode
mode = 'ab' if existing_size > 0 else 'wb'
with open(self.temp_path, mode) as f:
for chunk in r.iter_content(chunk_size=self.chunk_size):
if chunk: # filter out keep-alive new chunks
f.write(chunk)
existing_size += len(chunk)
# Simple progress indicator
print(f"\rDownloaded: existing_size bytes", end="")
# Rename temp file to final name upon completion
os.rename(self.temp_path, self.file_path)
print("\nDownload completed successfully.")
return True
except requests.exceptions.RequestException as e:
print(f"\nDownload failed: e")
return False
except KeyboardInterrupt:
print("\nDownload paused by user.")
return False
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Here is a conceptual implementation of a robust file download manager in Python. This feature focuses on resumable downloads, progress tracking, and error handling.