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"""File caching service"""
import os
import asyncio
import hashlib
import time
from pathlib import Path
from typing import Optional
from datetime import datetime, timedelta
from curl_cffi.requests import AsyncSession
from ..core.config import config
from ..core.logger import debug_logger
class FileCache:
"""File caching service for images and videos"""
def __init__(self, cache_dir: str = "tmp", default_timeout: int = 7200, proxy_manager=None):
"""
Initialize file cache
Args:
cache_dir: Cache directory path
default_timeout: Default cache timeout in seconds (default: 2 hours)
proxy_manager: ProxyManager instance for downloading files
"""
self.cache_dir = Path(cache_dir)
self.cache_dir.mkdir(exist_ok=True)
self.default_timeout = default_timeout
self.proxy_manager = proxy_manager
self._cleanup_task = None
async def start_cleanup_task(self):
"""Start background cleanup task"""
if self._cleanup_task is None:
self._cleanup_task = asyncio.create_task(self._cleanup_loop())
async def stop_cleanup_task(self):
"""Stop background cleanup task"""
if self._cleanup_task:
self._cleanup_task.cancel()
try:
await self._cleanup_task
except asyncio.CancelledError:
pass
self._cleanup_task = None
async def _cleanup_loop(self):
"""Background task to clean up expired files"""
while True:
try:
await asyncio.sleep(300) # Check every 5 minutes
await self._cleanup_expired_files()
except asyncio.CancelledError:
break
except Exception as e:
debug_logger.log_error(
error_message=f"Cleanup task error: {str(e)}",
status_code=0,
response_text=""
)
async def _cleanup_expired_files(self):
"""Remove expired cache files"""
try:
current_time = time.time()
removed_count = 0
for file_path in self.cache_dir.iterdir():
if file_path.is_file():
# Check file age
file_age = current_time - file_path.stat().st_mtime
if file_age > self.default_timeout:
try:
file_path.unlink()
removed_count += 1
debug_logger.log_info(f"Removed expired cache file: {file_path.name}")
except Exception as e:
debug_logger.log_error(
error_message=f"Failed to remove file {file_path.name}: {str(e)}",
status_code=0,
response_text=""
)
if removed_count > 0:
debug_logger.log_info(f"Cleanup completed: removed {removed_count} expired files")
except Exception as e:
debug_logger.log_error(
error_message=f"Cleanup error: {str(e)}",
status_code=0,
response_text=""
)
def _generate_cache_filename(self, url: str, media_type: str) -> str:
"""
Generate cache filename from URL
Args:
url: Original URL
media_type: 'image' or 'video'
Returns:
Cache filename
"""
# Use URL hash as filename
url_hash = hashlib.md5(url.encode()).hexdigest()
# Determine extension
if media_type == "video":
ext = ".mp4"
else:
ext = ".png"
return f"{url_hash}{ext}"
async def download_and_cache(self, url: str, media_type: str) -> str:
"""
Download file from URL and cache it locally
Args:
url: File URL to download
media_type: 'image' or 'video'
Returns:
Local cache filename
"""
filename = self._generate_cache_filename(url, media_type)
file_path = self.cache_dir / filename
# Check if already cached and not expired
if file_path.exists():
file_age = time.time() - file_path.stat().st_mtime
if file_age < self.default_timeout:
debug_logger.log_info(f"Cache hit: {filename}")
return filename
else:
# Remove expired file
try:
file_path.unlink()
except Exception:
pass
# Download file
debug_logger.log_info(f"Downloading file from: {url}")
try:
# Get proxy if available
proxy_url = None
if self.proxy_manager:
proxy_config = await self.proxy_manager.get_proxy_config()
if proxy_config.proxy_enabled and proxy_config.proxy_url:
proxy_url = proxy_config.proxy_url
# Download with proxy support
async with AsyncSession() as session:
proxies = {"http": proxy_url, "https": proxy_url} if proxy_url else None
response = await session.get(url, timeout=60, proxies=proxies)
if response.status_code != 200:
raise Exception(f"Download failed: HTTP {response.status_code}")
# Save to cache
with open(file_path, 'wb') as f:
f.write(response.content)
debug_logger.log_info(f"File cached: {filename} ({len(response.content)} bytes)")
return filename
except Exception as e:
debug_logger.log_error(
error_message=f"Failed to download file: {str(e)}",
status_code=0,
response_text=str(e)
)
raise Exception(f"Failed to cache file: {str(e)}")
def get_cache_path(self, filename: str) -> Path:
"""Get full path to cached file"""
return self.cache_dir / filename
def set_timeout(self, timeout: int):
"""Set cache timeout in seconds"""
self.default_timeout = timeout
debug_logger.log_info(f"Cache timeout updated to {timeout} seconds")
def get_timeout(self) -> int:
"""Get current cache timeout"""
return self.default_timeout
async def clear_all(self):
"""Clear all cached files"""
try:
removed_count = 0
for file_path in self.cache_dir.iterdir():
if file_path.is_file():
try:
file_path.unlink()
removed_count += 1
except Exception:
pass
debug_logger.log_info(f"Cache cleared: removed {removed_count} files")
return removed_count
except Exception as e:
debug_logger.log_error(
error_message=f"Failed to clear cache: {str(e)}",
status_code=0,
response_text=""
)
raise
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