137 lines
No EOL
3.9 KiB
Python
137 lines
No EOL
3.9 KiB
Python
from tempfile import gettempdir
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from urllib import request
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from urllib.error import URLError
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from pathlib import Path
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from functools import wraps
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import json
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import os
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from time import time
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import socket
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from concurrent.futures import ThreadPoolExecutor
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import logging
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logging = logging.getLogger(__name__)
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URL_SCHEMA = [
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'http://',
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'https://',
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]
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socket.setdefaulttimeout(15)
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def cache(file_name:str, max_age=30, dir=gettempdir()):
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"""
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Cache decorator
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"""
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def decorator(func):
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@wraps(func)
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def wrapper(*args, **kwargs):
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cache_file = Path(dir, file_name)
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if not Path(cache_file).is_absolute():
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cache_file = Path(gettempdir(), cache_file)
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if cache_file.exists() and file_age(cache_file) < max_age and cache_file.stat().st_size != 0:
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with open(cache_file, 'r', encoding='utf-8') as f:
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try:
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cache = json.load(f)
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except json.JSONDecodeError:
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logging.warning('Unable to read cache file: %s', cache_file)
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f.close()
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os.remove(cache_file)
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else:
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return cache
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data = func(*args, **kwargs)
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if data is None:
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return None
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if len(data) != 0:
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try:
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write_json(data, cache_file)
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except FileNotFoundError:
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logging.warning('Unable to write cache file: %s', cache_file)
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return data
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return wrapper
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return decorator
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def read_json(path:str):
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"""
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Read json file
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"""
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with open(path, 'r', encoding='utf-8') as f:
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data = json.load(f)
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def write_json(data, path):
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if not Path(path).parent.exists():
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Path(path).parent.mkdir(parents=True)
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with open(path, 'w') as f:
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json.dump(data, f)
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def file_age(path):
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age = time() - path.stat().st_mtime
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return age
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def get_cache(path, max_age=0):
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if Path(path).exists() and file_age(path) < max_age and path.stat().st_size != 0:
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return read_json(path)
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return None
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def refresh_cache(file_name:str, dir:str=gettempdir()):
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"""
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Touch cache file
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"""
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cache_file = Path(dir, file_name)
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if cache_file.exists():
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cache_file.touch()
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def cache_path(file_name:str, dir:str=gettempdir()):
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"""
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Return path to cache file
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"""
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return Path(dir, file_name)
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def remove_cache(file_name:str, dir:str=gettempdir()):
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"""
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Remove cache file
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"""
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cache_file = Path(dir, file_name)
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if cache_file.exists():
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cache_file.unlink()
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def download_file(url:str, path, **kwargs):
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"""
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Download file from url and save it to dir
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Args:
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url (str): image url.
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dir (str): directory to save image.
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file_name (str): file name to save image.
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Keyword Args:
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force_download (bool): Force download image even if it exists.
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"""
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force_download = kwargs.pop('force_download', False)
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if not force_download and path.exists():
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return
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try:
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request.urlretrieve(url, path)
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except URLError as e:
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logging.exception(f'Unable to download: {url}')
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return Path(path)
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def get_icon(url:str, path, file_name:str=None, **kwargs):
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for schema in URL_SCHEMA:
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if url.startswith(schema):
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break
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else:
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return url
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executor = kwargs.pop('executor', False)
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if file_name is None:
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file_name = url.split('/')[-1]
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if not Path(path).is_absolute():
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path = Path(gettempdir(), path)
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if not path.exists():
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path.mkdir(parents=True)
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full_path = Path(path, file_name)
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if not full_path.exists():
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if executor is False:
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download_file(url, full_path)
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else:
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executor.submit(download_file, url, full_path)
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return full_path |