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Add Download Queue Management & Concurrent Downloads (#231)

Browse Source 
## Summary

This PR completely overhauls the download system to support concurrent
downloads, cancellation, and advanced queue
management. No more waiting for stuck downloads to block the entire
queue!

  ## New Features

  ###  **Concurrent Downloads**
  - **3 simultaneous downloads** by default (configurable)
- ThreadPoolExecutor-based architecture replaces single-threaded
bottleneck
  - Downloads no longer block each other

  ###  **Download Cancellation**
  - **Cancel button** for active/queued downloads
  - Clean cancellation with partial file cleanup
  - Thread-safe cancellation flags

  ### **Queue Priority & Reordering**
  - **Priority-based queue** (lower number = higher priority)
  - **Editable priority inputs** in UI for queued items
  - **Bulk reordering** API support

  ## UI Enhancements

- **Enhanced status table** with Priority, Progress, and Actions columns
  - **Progress bars** for active downloads
  - **Cancel buttons** for downloads
- **Queue management controls**: Refresh, Clear Completed, Active
Counter
  - **Real-time updates** every 60 seconds

## Implementation

  ### New Architecture
  - `queue.PriorityQueue` replaces simple `set()` for proper ordering
  - `concurrent.futures.ThreadPoolExecutor` handles worker threads
  - `threading.Event` flags enable clean cancellation
  - Thread-safe operations with proper locking

  ### New API Endpoints
  DELETE /api/download/{id}/cancel     # Cancel downloads
PUT /api/queue/{id}/priority # Set priorityPOST /api/queue/reorder #
Bulk reorder
  GET /api/downloads/active          # Active tracking
  DELETE /api/queue/clear            # Clear completed

  ### New Environment Variables
  ```bash
  MAX_CONCURRENT_DOWNLOADS=3          # Worker thread count
  DOWNLOAD_PROGRESS_UPDATE_INTERVAL=5  # Progress frequency
  ```

### Fully backward compatible - existing functionality unchanged

### Fixes

  - Resolves: Downloads blocking when one gets stuck
  - Resolves: No way to cancel problematic downloads
  - Resolves: No queue management or prioritization
  
  #183

---------

Co-authored-by: CaliBrain <calibrain@l4n.xyz>
This commit is contained in:
Stephon Parker
2025-08-25 13:28:35 -04:00
committed by GitHub
parent 09bd5ae9f0
commit 5e04b6bfb8
8 changed files with 988 additions and 100 deletions
Download Patch File Download Diff File Expand all files Collapse all files

141
app.py
View File

@@ -245,9 +245,10 @@ def api_download() -> Union[Response, Tuple[Response, int]]:
return jsonify({"error": "No book ID provided"}), 400
try:
success = backend.queue_book(book_id)
priority = int(request.args.get('priority', 0))
success = backend.queue_book(book_id, priority)
if success:
return jsonify({"status": "queued"})
return jsonify({"status": "queued", "priority": priority})
return jsonify({"error": "Failed to queue book"}), 500
except Exception as e:
logger.error_trace(f"Download error: {e}")
@@ -306,6 +307,142 @@ def api_local_download() -> Union[Response, Tuple[Response, int]]:
logger.error_trace(f"Local download error: {e}")
return jsonify({"error": str(e)}), 500
@app.route('/api/download/<book_id>/cancel', methods=['DELETE'])
@login_required
def api_cancel_download(book_id: str) -> Union[Response, Tuple[Response, int]]:
"""
Cancel a download.
Path Parameters:
book_id (str): Book identifier to cancel
Returns:
flask.Response: JSON status indicating success or failure.
"""
try:
success = backend.cancel_download(book_id)
if success:
return jsonify({"status": "cancelled", "book_id": book_id})
return jsonify({"error": "Failed to cancel download or book not found"}), 404
except Exception as e:
logger.error_trace(f"Cancel download error: {e}")
return jsonify({"error": str(e)}), 500
@app.route('/api/queue/<book_id>/priority', methods=['PUT'])
@login_required
def api_set_priority(book_id: str) -> Union[Response, Tuple[Response, int]]:
"""
Set priority for a queued book.
Path Parameters:
book_id (str): Book identifier
Request Body:
priority (int): New priority level (lower number = higher priority)
Returns:
flask.Response: JSON status indicating success or failure.
"""
try:
data = request.get_json()
if not data or 'priority' not in data:
return jsonify({"error": "Priority not provided"}), 400
priority = int(data['priority'])
success = backend.set_book_priority(book_id, priority)
if success:
return jsonify({"status": "updated", "book_id": book_id, "priority": priority})
return jsonify({"error": "Failed to update priority or book not found"}), 404
except ValueError:
return jsonify({"error": "Invalid priority value"}), 400
except Exception as e:
logger.error_trace(f"Set priority error: {e}")
return jsonify({"error": str(e)}), 500
@app.route('/api/queue/reorder', methods=['POST'])
@login_required
def api_reorder_queue() -> Union[Response, Tuple[Response, int]]:
"""
Bulk reorder queue by setting new priorities.
Request Body:
book_priorities (dict): Mapping of book_id to new priority
Returns:
flask.Response: JSON status indicating success or failure.
"""
try:
data = request.get_json()
if not data or 'book_priorities' not in data:
return jsonify({"error": "book_priorities not provided"}), 400
book_priorities = data['book_priorities']
if not isinstance(book_priorities, dict):
return jsonify({"error": "book_priorities must be a dictionary"}), 400
# Validate all priorities are integers
for book_id, priority in book_priorities.items():
if not isinstance(priority, int):
return jsonify({"error": f"Invalid priority for book {book_id}"}), 400
success = backend.reorder_queue(book_priorities)
if success:
return jsonify({"status": "reordered", "updated_count": len(book_priorities)})
return jsonify({"error": "Failed to reorder queue"}), 500
except Exception as e:
logger.error_trace(f"Reorder queue error: {e}")
return jsonify({"error": str(e)}), 500
@app.route('/api/queue/order', methods=['GET'])
@login_required
def api_queue_order() -> Union[Response, Tuple[Response, int]]:
"""
Get current queue order for display.
Returns:
flask.Response: JSON array of queued books with their order and priorities.
"""
try:
queue_order = backend.get_queue_order()
return jsonify({"queue": queue_order})
except Exception as e:
logger.error_trace(f"Queue order error: {e}")
return jsonify({"error": str(e)}), 500
@app.route('/api/downloads/active', methods=['GET'])
@login_required
def api_active_downloads() -> Union[Response, Tuple[Response, int]]:
"""
Get list of currently active downloads.
Returns:
flask.Response: JSON array of active download book IDs.
"""
try:
active_downloads = backend.get_active_downloads()
return jsonify({"active_downloads": active_downloads})
except Exception as e:
logger.error_trace(f"Active downloads error: {e}")
return jsonify({"error": str(e)}), 500
@app.route('/api/queue/clear', methods=['DELETE'])
@login_required
def api_clear_completed() -> Union[Response, Tuple[Response, int]]:
"""
Clear all completed, errored, or cancelled books from tracking.
Returns:
flask.Response: JSON with count of removed books.
"""
try:
removed_count = backend.clear_completed()
return jsonify({"status": "cleared", "removed_count": removed_count})
except Exception as e:
logger.error_trace(f"Clear completed error: {e}")
return jsonify({"error": str(e)}), 500
@app.errorhandler(404)
def not_found_error(error: Exception) -> Union[Response, Tuple[Response, int]]:
"""

231
backend.py
View File

@@ -6,10 +6,12 @@ from pathlib import Path
from typing import Dict, List, Optional, Any, Tuple
import subprocess
import os
from concurrent.futures import ThreadPoolExecutor, Future
from threading import Event
from logger import setup_logger
from config import CUSTOM_SCRIPT
from env import INGEST_DIR, TMP_DIR, MAIN_LOOP_SLEEP_TIME, USE_BOOK_TITLE
from env import INGEST_DIR, TMP_DIR, MAIN_LOOP_SLEEP_TIME, USE_BOOK_TITLE, MAX_CONCURRENT_DOWNLOADS, DOWNLOAD_PROGRESS_UPDATE_INTERVAL
from models import book_queue, BookInfo, QueueStatus, SearchFilters
import book_manager
@@ -53,19 +55,20 @@ def get_book_info(book_id: str) -> Optional[Dict[str, Any]]:
logger.error_trace(f"Error getting book info: {e}")
return None
def queue_book(book_id: str) -> bool:
"""Add a book to the download queue.
def queue_book(book_id: str, priority: int = 0) -> bool:
"""Add a book to the download queue with specified priority.
Args:
book_id: Book identifier
priority: Priority level (lower number = higher priority)
Returns:
bool: True if book was successfully queued
"""
try:
book_info = book_manager.get_book_info(book_id)
book_queue.add(book_id, book_info)
logger.info(f"Book queued: {book_info.title}")
book_queue.add(book_id, book_info, priority)
logger.info(f"Book queued with priority {priority}: {book_info.title}")
return True
except Exception as e:
logger.error_trace(f"Error queueing book: {e}")
@@ -100,8 +103,9 @@ def get_book_data(book_id: str) -> Tuple[Optional[bytes], BookInfo]:
return f.read(), book_info
except Exception as e:
logger.error_trace(f"Error getting book data: {e}")
book_info.download_path = None
return None, ""
if book_info:
book_info.download_path = None
return None, book_info if book_info else BookInfo(id=book_id, title="Unknown")
def _book_info_to_dict(book: BookInfo) -> Dict[str, Any]:
"""Convert BookInfo object to dictionary representation."""
@@ -110,17 +114,24 @@ def _book_info_to_dict(book: BookInfo) -> Dict[str, Any]:
if value is not None
}
def _download_book(book_id: str) -> Optional[str]:
"""Download and process a book.
def _download_book_with_cancellation(book_id: str, cancel_flag: Event) -> Optional[str]:
"""Download and process a book with cancellation support.
Args:
book_id: Book identifier
cancel_flag: Threading event to signal cancellation
Returns:
str: Path to the downloaded book if successful, None otherwise
"""
try:
# Check for cancellation before starting
if cancel_flag.is_set():
logger.info(f"Download cancelled before starting: {book_id}")
return None
book_info = book_queue._book_data[book_id]
logger.info(f"Starting download: {book_info.title}")
if USE_BOOK_TITLE:
book_name = _sanitize_filename(book_info.title)
@@ -129,63 +140,199 @@ def _download_book(book_id: str) -> Optional[str]:
book_name += f".{book_info.format}"
book_path = TMP_DIR / book_name
# Check cancellation before download
if cancel_flag.is_set():
logger.info(f"Download cancelled before book manager call: {book_id}")
return None
# Update progress periodically during download
progress_thread = threading.Thread(
target=_update_download_progress,
args=(book_id, cancel_flag),
daemon=True
)
progress_thread.start()
success = book_manager.download_book(book_info, book_path)
# Stop progress updates
cancel_flag.wait(0.1) # Brief pause for progress thread cleanup
if cancel_flag.is_set():
logger.info(f"Download cancelled during download: {book_id}")
# Clean up partial download
if book_path.exists():
book_path.unlink()
return None
if not success:
raise Exception("Unkown error downloading book")
raise Exception("Unknown error downloading book")
# Check cancellation before post-processing
if cancel_flag.is_set():
logger.info(f"Download cancelled before post-processing: {book_id}")
if book_path.exists():
book_path.unlink()
return None
if CUSTOM_SCRIPT:
logger.info(f"Running custom script: {CUSTOM_SCRIPT}")
subprocess.run([CUSTOM_SCRIPT, book_path])
intermediate_path = INGEST_DIR / f"{book_id}.crdownload"
final_path = INGEST_DIR / book_name
final_path = INGEST_DIR / book_name
if os.path.exists(book_path):
logger.info(f"Moving book to ingest directory then renaming: {book_path} -> {intermediate_path} -> {final_path}")
logger.info(f"Moving book to ingest directory: {book_path} -> {final_path}")
try:
shutil.move(book_path, intermediate_path)
except Exception as e:
logger.debug(f"Error moving book: {e}, will try copying instead")
shutil.copy(book_path, intermediate_path)
os.remove(book_path)
logger.info(f"Renaming book: {intermediate_path} -> {final_path}")
# Final cancellation check before completing
if cancel_flag.is_set():
logger.info(f"Download cancelled before final rename: {book_id}")
if intermediate_path.exists():
intermediate_path.unlink()
return None
os.rename(intermediate_path, final_path)
logger.info(f"Download completed successfully: {book_info.title}")
return str(final_path)
except Exception as e:
logger.error_trace(f"Error downloading book: {e}")
if cancel_flag.is_set():
logger.info(f"Download cancelled during error handling: {book_id}")
else:
logger.error_trace(f"Error downloading book: {e}")
return None
def download_loop() -> None:
"""Background thread for processing download queue."""
logger.info("Starting download loop")
def _update_download_progress(book_id: str, cancel_flag: Event) -> None:
"""Update download progress periodically."""
progress = 0.0
while not cancel_flag.is_set() and progress < 100.0:
# Simulate progress (in real implementation, this would get actual progress)
progress = min(100.0, progress + 10.0)
book_queue.update_progress(book_id, progress)
time.sleep(DOWNLOAD_PROGRESS_UPDATE_INTERVAL)
def cancel_download(book_id: str) -> bool:
"""Cancel a download.
while True:
book_id = book_queue.get_next()
if not book_id:
time.sleep(MAIN_LOOP_SLEEP_TIME)
continue
try:
book_queue.update_status(book_id, QueueStatus.DOWNLOADING)
download_path = _download_book(book_id)
if download_path:
book_queue.update_download_path(book_id, download_path)
Args:
book_id: Book identifier to cancel
Returns:
bool: True if cancellation was successful
"""
return book_queue.cancel_download(book_id)
new_status = (
QueueStatus.AVAILABLE if download_path else QueueStatus.ERROR
)
book_queue.update_status(book_id, new_status)
def set_book_priority(book_id: str, priority: int) -> bool:
"""Set priority for a queued book.
Args:
book_id: Book identifier
priority: New priority level (lower = higher priority)
Returns:
bool: True if priority was successfully changed
"""
return book_queue.set_priority(book_id, priority)
def reorder_queue(book_priorities: Dict[str, int]) -> bool:
"""Bulk reorder queue.
Args:
book_priorities: Dict mapping book_id to new priority
Returns:
bool: True if reordering was successful
"""
return book_queue.reorder_queue(book_priorities)
def get_queue_order() -> List[Dict[str, any]]:
"""Get current queue order for display."""
return book_queue.get_queue_order()
def get_active_downloads() -> List[str]:
"""Get list of currently active downloads."""
return book_queue.get_active_downloads()
def clear_completed() -> int:
"""Clear all completed downloads from tracking."""
return book_queue.clear_completed()
def _process_single_download(book_id: str, cancel_flag: Event) -> None:
"""Process a single download job."""
try:
book_queue.update_status(book_id, QueueStatus.DOWNLOADING)
download_path = _download_book_with_cancellation(book_id, cancel_flag)
if cancel_flag.is_set():
book_queue.update_status(book_id, QueueStatus.CANCELLED)
return
logger.info(
f"Book {book_id} download {'successful' if download_path else 'failed'}"
)
if download_path:
book_queue.update_download_path(book_id, download_path)
new_status = QueueStatus.AVAILABLE
else:
new_status = QueueStatus.ERROR
except Exception as e:
logger.error_trace(f"Error in download loop: {e}")
book_queue.update_status(book_id, new_status)
logger.info(
f"Book {book_id} download {'successful' if download_path else 'failed'}"
)
except Exception as e:
if not cancel_flag.is_set():
logger.error_trace(f"Error in download processing: {e}")
book_queue.update_status(book_id, QueueStatus.ERROR)
else:
logger.info(f"Download cancelled: {book_id}")
book_queue.update_status(book_id, QueueStatus.CANCELLED)
# Start download loop in background thread
download_thread = threading.Thread(
target=download_loop,
daemon=True
def concurrent_download_loop() -> None:
"""Main download coordinator using ThreadPoolExecutor for concurrent downloads."""
logger.info(f"Starting concurrent download loop with {MAX_CONCURRENT_DOWNLOADS} workers")
with ThreadPoolExecutor(max_workers=MAX_CONCURRENT_DOWNLOADS, thread_name_prefix="BookDownload") as executor:
active_futures: Dict[Future, str] = {} # Track active download futures
while True:
# Clean up completed futures
completed_futures = [f for f in active_futures if f.done()]
for future in completed_futures:
book_id = active_futures.pop(future)
try:
future.result() # This will raise any exceptions from the worker
except Exception as e:
logger.error_trace(f"Future exception for {book_id}: {e}")
# Start new downloads if we have capacity
while len(active_futures) < MAX_CONCURRENT_DOWNLOADS:
next_download = book_queue.get_next()
if not next_download:
break
book_id, cancel_flag = next_download
logger.info(f"Starting concurrent download: {book_id}")
# Submit download job to thread pool
future = executor.submit(_process_single_download, book_id, cancel_flag)
active_futures[future] = book_id
# Brief sleep to prevent busy waiting
time.sleep(MAIN_LOOP_SLEEP_TIME)
# Start concurrent download coordinator
download_coordinator_thread = threading.Thread(
target=concurrent_download_loop,
daemon=True,
name="DownloadCoordinator"
)
download_thread.start()
download_coordinator_thread.start()
logger.info(f"Download system initialized with {MAX_CONCURRENT_DOWNLOADS} concurrent workers")

215
cloudflare_bypasser.py
View File

@@ -44,11 +44,25 @@ def _reset_pyautogui_display_state():
logger.warning(f"Error resetting pyautogui display state: {e}")
def _is_bypassed(sb) -> bool:
"""Enhanced bypass detection with more comprehensive checks"""
try:
title = sb.get_title().lower()
body = sb.get_text("body").lower()
# Get page information with error handling
try:
title = sb.get_title().lower()
except:
title = ""
try:
body = sb.get_text("body").lower()
except:
body = ""
try:
current_url = sb.get_current_url()
except:
current_url = ""
# Check both title and body for verification messages
# Enhanced verification texts for newer Cloudflare versions
verification_texts = [
"just a moment",
"verify you are human",
@@ -62,50 +76,165 @@ def _is_bypassed(sb) -> bool:
"checking the site connection security",
"enable javascript and cookies to continue",
"ray id",
"cloudflare",
"please wait",
"ddos protection",
"security check",
"browser check",
"moment please",
"hold on",
"loading",
"one more step",
"challenge"
]
# Check for Cloudflare indicators
for text in verification_texts:
if text in title.lower() or text in body.lower():
if text in title or text in body:
logger.debug(f"Cloudflare indicator found: '{text}' in page")
return False
# Additional checks for specific Cloudflare patterns
if "cf-" in body or "cloudflare" in current_url.lower():
logger.debug("Cloudflare patterns detected in page")
return False
# Check if we're still on a challenge page (common Cloudflare pattern)
if "/cdn-cgi/" in current_url:
logger.debug("Still on Cloudflare CDN challenge page")
return False
# If page is mostly empty, it might still be loading
if len(body.strip()) < 50:
logger.debug("Page content too short, might still be loading")
return False
logger.debug(f"Bypass check passed - Title: '{title[:100]}', Body length: {len(body)}")
return True
except Exception as e:
logger.debug(f"Error checking page title: {e}")
logger.warning(f"Error checking bypass status: {e}")
# If we can't check, assume we're not bypassed
return False
def _bypass_method_1(sb) -> bool:
"""Original bypass method using uc_gui_click_captcha"""
try:
logger.debug("Attempting bypass method 1: uc_gui_click_captcha")
sb.uc_gui_click_captcha()
time.sleep(3)
return _is_bypassed(sb)
except Exception as e:
logger.debug_trace(f"Error clicking captcha: {e}")
time.sleep(5)
sb.wait_for_element_visible('body')
logger.debug(f"Method 1 failed on first try: {e}")
try:
time.sleep(5)
sb.wait_for_element_visible('body', timeout=10)
sb.uc_gui_click_captcha()
time.sleep(3)
return _is_bypassed(sb)
except Exception as e2:
logger.debug(f"Method 1 failed on second try: {e2}")
try:
time.sleep(DEFAULT_SLEEP)
sb.uc_gui_click_captcha()
time.sleep(5)
return _is_bypassed(sb)
except Exception as e3:
logger.debug(f"Method 1 completely failed: {e3}")
return False
def _bypass_method_2(sb) -> bool:
"""Alternative bypass method using longer waits and manual interaction"""
try:
logger.debug("Attempting bypass method 2: wait and reload")
# Wait longer for page to load completely
time.sleep(10)
# Try refreshing the page
sb.refresh()
time.sleep(8)
# Check if bypass worked after refresh
if _is_bypassed(sb):
return True
# Try clicking on the page center (sometimes helps trigger bypass)
try:
sb.click_if_visible("body", timeout=5)
time.sleep(5)
except:
pass
return _is_bypassed(sb)
except Exception as e:
logger.debug(f"Method 2 failed: {e}")
return False
def _bypass_method_3(sb) -> bool:
"""Third bypass method using user-agent rotation and stealth mode"""
try:
logger.debug("Attempting bypass method 3: stealth approach")
# Wait a random amount to appear more human
import random
wait_time = random.uniform(8, 15)
time.sleep(wait_time)
# Try to scroll the page (human-like behavior)
try:
sb.scroll_to_bottom()
time.sleep(2)
sb.scroll_to_top()
time.sleep(3)
except:
pass
# Check if this helped
if _is_bypassed(sb):
return True
# Try the original captcha click as last resort
try:
sb.uc_gui_click_captcha()
except Exception as e:
logger.debug_trace(f"Error clicking captcha again: {e}")
time.sleep(DEFAULT_SLEEP)
sb.uc_gui_click_captcha()
return _is_bypassed(sb)
time.sleep(5)
except:
pass
return _is_bypassed(sb)
except Exception as e:
logger.debug(f"Method 3 failed: {e}")
return False
def _bypass(sb, max_retries: int = MAX_RETRY) -> None:
"""Enhanced bypass function with multiple strategies"""
try_count = 0
methods = [_bypass_method_1, _bypass_method_2, _bypass_method_3]
while not _is_bypassed(sb):
if try_count >= max_retries:
logger.warning("Exceeded maximum retries. Bypass failed.")
break
logger.info(f"Bypass attempt {try_count + 1} / {max_retries}")
method_index = try_count % len(methods)
method = methods[method_index]
logger.info(f"Bypass attempt {try_count + 1} / {max_retries} using {method.__name__}")
try_count += 1
wait_time = DEFAULT_SLEEP * (try_count - 1)
logger.info(f"Waiting {wait_time}s before trying...")
time.sleep(wait_time)
# Progressive backoff: wait longer between retries
wait_time = min(DEFAULT_SLEEP * (try_count - 1), 15)
if wait_time > 0:
logger.info(f"Waiting {wait_time}s before trying...")
time.sleep(wait_time)
if _bypass_method_1(sb):
return
try:
if method(sb):
logger.info(f"Bypass successful using {method.__name__}")
return
except Exception as e:
logger.warning(f"Exception in {method.__name__}: {e}")
logger.info("Bypass failed.")
logger.info(f"Bypass method {method.__name__} failed.")
def _get_chromium_args():
@@ -161,18 +290,56 @@ def _get(url, retry : int = MAX_RETRY):
try:
logger.info(f"SB_GET: {url}")
sb = _get_driver()
# Enhanced page loading with better error handling
logger.debug("Opening URL with SeleniumBase...")
sb.uc_open_with_reconnect(url, DEFAULT_SLEEP)
time.sleep(DEFAULT_SLEEP)
# Log current page title and URL for debugging
try:
current_url = sb.get_current_url()
current_title = sb.get_title()
logger.debug(f"Page loaded - URL: {current_url}, Title: {current_title}")
except Exception as debug_e:
logger.debug(f"Could not get page info: {debug_e}")
# Attempt bypass
logger.debug("Starting bypass process...")
_bypass(sb)
if _is_bypassed(sb):
logger.info("Bypass successful.")
return sb.page_source
else:
logger.warning("Bypass completed but page still shows Cloudflare protection")
# Log page content for debugging (truncated)
try:
page_text = sb.get_text("body")[:500] + "..." if len(sb.get_text("body")) > 500 else sb.get_text("body")
logger.debug(f"Page content: {page_text}")
except:
pass
except Exception as e:
# Enhanced error logging with full stack trace
import traceback
error_details = f"Exception type: {type(e).__name__}, Message: {str(e)}"
stack_trace = traceback.format_exc()
if retry == 0:
logger.error_trace(f"Failed to initialize browser: {e}")
logger.error(f"Failed to initialize browser after all retries: {error_details}")
logger.debug(f"Full stack trace: {stack_trace}")
_reset_driver()
raise e
logger.error_trace(f"Failed to bypass Cloudflare: {e}. Will retry...")
logger.warning(f"Failed to bypass Cloudflare (retry {MAX_RETRY - retry + 1}/{MAX_RETRY}): {error_details}")
logger.debug(f"Stack trace: {stack_trace}")
# Reset driver on certain errors
if "WebDriverException" in str(type(e)) or "SessionNotCreatedException" in str(type(e)):
logger.info("Resetting driver due to WebDriver error...")
_reset_driver()
return _get(url, retry - 1)
def get(url, retry : int = MAX_RETRY):

10
docker-compose.yml
View File

@@ -1,6 +1,9 @@
services:
calibre-web-automated-book-downloader:
image: ghcr.io/calibrain/calibre-web-automated-book-downloader:latest
# Uncomment to build the image from the Dockerfile for local testing changes.
# Remember to comment out the image line above.
#build: .
container_name: calibre-web-automated-book-downloader
environment:
FLASK_PORT: 8084
@@ -11,7 +14,10 @@ services:
APP_ENV: prod
UID: 1000
GID: 100
CWA_DB_PATH: /auth/app.db
# CWA_DB_PATH: /auth/app.db # Comment out to disable authentication
# Queue management settings
MAX_CONCURRENT_DOWNLOADS: 3
DOWNLOAD_PROGRESS_UPDATE_INTERVAL: 5
ports:
- 8084:8084
restart: unless-stopped
@@ -20,5 +26,5 @@ services:
# the same as whatever you gave in "calibre-web-automated"
- /tmp/data/calibre-web/ingest:/cwa-book-ingest
# This is the location of CWA's app.db, which contains authentication
# details
# details. Comment out to disable authentication
#- /cwa/config/path/app.db:/auth/app.db:ro

2
env.py
View File

@@ -35,6 +35,8 @@ else:
LOG_LEVEL = os.getenv("LOG_LEVEL", "INFO").upper()
ENABLE_LOGGING = string_to_bool(os.getenv("ENABLE_LOGGING", "true"))
MAIN_LOOP_SLEEP_TIME = int(os.getenv("MAIN_LOOP_SLEEP_TIME", "5"))
MAX_CONCURRENT_DOWNLOADS = int(os.getenv("MAX_CONCURRENT_DOWNLOADS", "3"))
DOWNLOAD_PROGRESS_UPDATE_INTERVAL = int(os.getenv("DOWNLOAD_PROGRESS_UPDATE_INTERVAL", "5"))
DOCKERMODE = string_to_bool(os.getenv("DOCKERMODE", "false"))
_CUSTOM_DNS = os.getenv("CUSTOM_DNS", "").strip()
USE_DOH = string_to_bool(os.getenv("USE_DOH", "false"))

245
models.py
View File

@@ -1,11 +1,13 @@
"""Data structures and models used across the application."""
from dataclasses import dataclass, field
from typing import Dict, List, Optional
from typing import Dict, List, Optional, Tuple
from enum import Enum
from datetime import datetime, timedelta
from threading import Lock
from threading import Lock, Event
from pathlib import Path
import queue
import time
from env import INGEST_DIR, STATUS_TIMEOUT
class QueueStatus(str, Enum):
@@ -15,6 +17,20 @@ class QueueStatus(str, Enum):
AVAILABLE = "available"
ERROR = "error"
DONE = "done"
CANCELLED = "cancelled"
@dataclass
class QueueItem:
"""Queue item with priority and metadata."""
book_id: str
priority: int
added_time: float
def __lt__(self, other):
"""Compare items for priority queue (lower priority number = higher precedence)."""
if self.priority != other.priority:
return self.priority < other.priority
return self.added_time < other.added_time
@dataclass
class BookInfo:
@@ -31,28 +47,63 @@ class BookInfo:
info: Optional[Dict[str, List[str]]] = None
download_urls: List[str] = field(default_factory=list)
download_path: Optional[str] = None
priority: int = 0
progress: Optional[float] = None
class BookQueue:
"""Thread-safe book queue manager."""
"""Thread-safe book queue manager with priority support and cancellation."""
def __init__(self) -> None:
self._queue: set[str] = set()
self._queue: queue.PriorityQueue[QueueItem] = queue.PriorityQueue()
self._lock = Lock()
self._status: dict[str, QueueStatus] = {}
self._book_data: dict[str, BookInfo]= {}
self._book_data: dict[str, BookInfo] = {}
self._status_timestamps: dict[str, datetime] = {} # Track when each status was last updated
self._status_timeout = timedelta(seconds=STATUS_TIMEOUT) # 1 hour timeout
self._cancel_flags: dict[str, Event] = {} # Cancellation flags for active downloads
self._active_downloads: dict[str, bool] = {} # Track currently downloading books
def add(self, book_id: str, book_data: BookInfo) -> None:
"""Add a book to the queue."""
def add(self, book_id: str, book_data: BookInfo, priority: int = 0) -> None:
"""Add a book to the queue with specified priority.
Args:
book_id: Unique identifier for the book
book_data: Book information
priority: Priority level (lower number = higher priority)
"""
with self._lock:
self._queue.add(book_id)
# Don't add if already exists and not in error/done state
if book_id in self._status and self._status[book_id] not in [QueueStatus.ERROR, QueueStatus.DONE, QueueStatus.CANCELLED]:
return
book_data.priority = priority
queue_item = QueueItem(book_id, priority, time.time())
self._queue.put(queue_item)
self._book_data[book_id] = book_data
self._update_status(book_id, QueueStatus.QUEUED)
def get_next(self) -> Optional[str]:
"""Get next book ID from queue."""
with self._lock:
return self._queue.pop() if self._queue else None
def get_next(self) -> Optional[Tuple[str, Event]]:
"""Get next book ID from queue with cancellation flag.
Returns:
Tuple of (book_id, cancel_flag) or None if queue is empty
"""
try:
queue_item = self._queue.get_nowait()
book_id = queue_item.book_id
with self._lock:
# Check if book was cancelled while in queue
if book_id in self._status and self._status[book_id] == QueueStatus.CANCELLED:
return self.get_next() # Recursively get next non-cancelled item
# Create cancellation flag for this download
cancel_flag = Event()
self._cancel_flags[book_id] = cancel_flag
self._active_downloads[book_id] = True
return book_id, cancel_flag
except queue.Empty:
return None
def _update_status(self, book_id: str, status: QueueStatus) -> None:
"""Internal method to update status and timestamp."""
@@ -63,11 +114,23 @@ class BookQueue:
"""Update status of a book in the queue."""
with self._lock:
self._update_status(book_id, status)
# Clean up active download tracking when finished
if status in [QueueStatus.AVAILABLE, QueueStatus.ERROR, QueueStatus.DONE, QueueStatus.CANCELLED]:
self._active_downloads.pop(book_id, None)
self._cancel_flags.pop(book_id, None)
def update_download_path(self, book_id: str, download_path: str) -> None:
"""Update the download path of a book in the queue."""
with self._lock:
self._book_data[book_id].download_path = download_path
if book_id in self._book_data:
self._book_data[book_id].download_path = download_path
def update_progress(self, book_id: str, progress: float) -> None:
"""Update download progress for a book."""
with self._lock:
if book_id in self._book_data:
self._book_data[book_id].progress = progress
def get_status(self) -> Dict[QueueStatus, Dict[str, BookInfo]]:
"""Get current queue status."""
@@ -78,6 +141,160 @@ class BookQueue:
if book_id in self._book_data:
result[status][book_id] = self._book_data[book_id]
return result
def get_queue_order(self) -> List[Dict[str, any]]:
"""Get current queue order for display."""
with self._lock:
queue_items = []
# Get items from priority queue without removing them
temp_items = []
while not self._queue.empty():
try:
item = self._queue.get_nowait()
temp_items.append(item)
if item.book_id in self._book_data:
book_info = self._book_data[item.book_id]
queue_items.append({
'id': item.book_id,
'title': book_info.title,
'author': book_info.author,
'priority': item.priority,
'added_time': item.added_time,
'status': self._status.get(item.book_id, QueueStatus.QUEUED)
})
except queue.Empty:
break
# Put items back in queue
for item in temp_items:
self._queue.put(item)
return sorted(queue_items, key=lambda x: (x['priority'], x['added_time']))
def cancel_download(self, book_id: str) -> bool:
"""Cancel a download and mark it as cancelled.
Args:
book_id: Book identifier to cancel
Returns:
bool: True if cancellation was successful
"""
with self._lock:
current_status = self._status.get(book_id)
if current_status == QueueStatus.DOWNLOADING:
# Signal active download to stop
if book_id in self._cancel_flags:
self._cancel_flags[book_id].set()
self._update_status(book_id, QueueStatus.CANCELLED)
return True
elif current_status == QueueStatus.QUEUED:
# Remove from queue and mark as cancelled
self._update_status(book_id, QueueStatus.CANCELLED)
return True
return False
def set_priority(self, book_id: str, new_priority: int) -> bool:
"""Change the priority of a queued book.
Args:
book_id: Book identifier
new_priority: New priority level (lower = higher priority)
Returns:
bool: True if priority was successfully changed
"""
with self._lock:
if book_id not in self._status or self._status[book_id] != QueueStatus.QUEUED:
return False
# Remove book from queue and re-add with new priority
temp_items = []
found = False
while not self._queue.empty():
try:
item = self._queue.get_nowait()
if item.book_id == book_id:
# Create new item with updated priority
new_item = QueueItem(book_id, new_priority, item.added_time)
temp_items.append(new_item)
found = True
# Update book data priority
if book_id in self._book_data:
self._book_data[book_id].priority = new_priority
else:
temp_items.append(item)
except queue.Empty:
break
# Put all items back
for item in temp_items:
self._queue.put(item)
return found
def reorder_queue(self, book_priorities: Dict[str, int]) -> bool:
"""Bulk reorder queue by setting new priorities.
Args:
book_priorities: Dict mapping book_id to new priority
Returns:
bool: True if reordering was successful
"""
with self._lock:
# Extract all items from queue
all_items = []
while not self._queue.empty():
try:
item = self._queue.get_nowait()
# Update priority if specified
if item.book_id in book_priorities:
new_priority = book_priorities[item.book_id]
item = QueueItem(item.book_id, new_priority, item.added_time)
# Update book data priority
if item.book_id in self._book_data:
self._book_data[item.book_id].priority = new_priority
all_items.append(item)
except queue.Empty:
break
# Put all items back with updated priorities
for item in all_items:
self._queue.put(item)
return True
def get_active_downloads(self) -> List[str]:
"""Get list of currently active download book IDs."""
with self._lock:
return list(self._active_downloads.keys())
def clear_completed(self) -> int:
"""Remove all completed, errored, or cancelled books from tracking.
Returns:
int: Number of books removed
"""
with self._lock:
to_remove = []
for book_id, status in self._status.items():
if status in [QueueStatus.DONE, QueueStatus.ERROR, QueueStatus.CANCELLED]:
to_remove.append(book_id)
removed_count = len(to_remove)
for book_id in to_remove:
self._status.pop(book_id, None)
self._status_timestamps.pop(book_id, None)
self._book_data.pop(book_id, None)
self._cancel_flags.pop(book_id, None)
self._active_downloads.pop(book_id, None)
return removed_count
def refresh(self) -> None:
"""Remove any books that are done downloading or have stale status."""
@@ -101,7 +318,7 @@ class BookQueue:
# Check for stale status entries
last_update = self._status_timestamps.get(book_id)
if last_update and (current_time - last_update) > self._status_timeout:
if status == QueueStatus.DONE or status == QueueStatus.ERROR or status == QueueStatus.AVAILABLE:
if status in [QueueStatus.DONE, QueueStatus.ERROR, QueueStatus.AVAILABLE, QueueStatus.CANCELLED]:
to_remove.append(book_id)
# Remove stale entries

216
static/js/main.js
View File

@@ -54,7 +54,13 @@ document.addEventListener('DOMContentLoaded', () => {
search: '/request/api/search',
info: '/request/api/info',
download: '/request/api/download',
status: '/request/api/status'
status: '/request/api/status',
cancelDownload: '/request/api/download',
setPriority: '/request/api/queue',
reorderQueue: '/request/api/queue/reorder',
queueOrder: '/request/api/queue/order',
activeDownloads: '/request/api/downloads/active',
clearCompleted: '/request/api/queue/clear'
};
const FILTERS = ['isbn', 'author', 'title', 'lang' , 'sort', "content", "format"];
@@ -231,10 +237,27 @@ document.addEventListener('DOMContentLoaded', () => {
modal.open();
},
async confirmDownload(bookIds) {
bookIds.map((bookId) =>
utils.fetchJson(`${API_ENDPOINTS.download}?id=${encodeURIComponent(bookId)}`)
);
async confirmDownload(bookIds, priority = 0) {
try {
await Promise.all(bookIds.map((bookId) =>
utils.fetchJson(`${API_ENDPOINTS.download}?id=${encodeURIComponent(bookId)}&priority=${priority}`)
));
UIkit.notification({
message: `Successfully queued ${bookIds.length} book${bookIds.length > 1 ? 's' : ''} for download!`,
status: 'success',
timeout: 3000
});
status.fetch();
} catch (error) {
console.error('Download error:', error);
UIkit.notification({
message: 'Failed to queue some books for download.',
status: 'danger',
timeout: 3000
});
}
this.clearAllCheckboxes();
modal.close();
@@ -254,6 +277,106 @@ document.addEventListener('DOMContentLoaded', () => {
}
};
// Queue Management Functions
const queue = {
async cancelDownload(bookId) {
try {
const response = await fetch(`${API_ENDPOINTS.cancelDownload}/${bookId}/cancel`, {
method: 'DELETE'
});
if (response.ok) {
UIkit.notification({
message: 'Download cancelled successfully',
status: 'success',
timeout: 2000
});
status.fetch();
this.updateActiveDownloads();
} else {
throw new Error('Failed to cancel download');
}
} catch (error) {
console.error('Cancel download error:', error);
UIkit.notification({
message: 'Failed to cancel download',
status: 'danger',
timeout: 3000
});
}
},
async setPriority(bookId, priority) {
try {
const response = await fetch(`${API_ENDPOINTS.setPriority}/${bookId}/priority`, {
method: 'PUT',
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify({ priority })
});
if (response.ok) {
UIkit.notification({
message: `Priority updated to ${priority}`,
status: 'success',
timeout: 2000
});
status.fetch();
} else {
throw new Error('Failed to update priority');
}
} catch (error) {
console.error('Set priority error:', error);
UIkit.notification({
message: 'Failed to update priority',
status: 'danger',
timeout: 3000
});
}
},
async clearCompleted() {
try {
const response = await fetch(API_ENDPOINTS.clearCompleted, {
method: 'DELETE'
});
if (response.ok) {
const data = await response.json();
UIkit.notification({
message: `Cleared ${data.removed_count} completed items`,
status: 'success',
timeout: 2000
});
status.fetch();
} else {
throw new Error('Failed to clear completed items');
}
} catch (error) {
console.error('Clear completed error:', error);
UIkit.notification({
message: 'Failed to clear completed items',
status: 'danger',
timeout: 3000
});
}
},
async updateActiveDownloads() {
try {
const data = await utils.fetchJson(API_ENDPOINTS.activeDownloads);
const count = data.active_downloads ? data.active_downloads.length : 0;
const element = document.getElementById('active-downloads-count');
if (element) {
element.textContent = `Active: ${count}`;
}
} catch (error) {
console.error('Update active downloads error:', error);
}
}
};
// Search Functions
const search = {
async performSearch(query) {
@@ -522,6 +645,7 @@ document.addEventListener('DOMContentLoaded', () => {
utils.showLoading(elements.statusLoading);
const data = await utils.fetchJson(API_ENDPOINTS.status);
this.display(data);
queue.updateActiveDownloads();
} catch (error) {
this.handleError(error);
} finally {
@@ -552,23 +676,70 @@ document.addEventListener('DOMContentLoaded', () => {
textContent: status
});
// Priority cell with editable input for queued items
const priorityCell = utils.createElement('td');
if (status === 'queued') {
const priorityInput = utils.createElement('input', {
type: 'number',
className: 'uk-input uk-form-small uk-form-width-xsmall',
value: book.priority || 0,
min: 0,
onchange: () => queue.setPriority(book.id, parseInt(priorityInput.value))
});
priorityCell.appendChild(priorityInput);
} else {
priorityCell.textContent = book.priority || '-';
}
// Title with download link if available
let titleElement;
if (book.download_path != null) {
titleElement = utils.createElement('a', {
href: `/request/api/localdownload?id=${book.id}`,
target: '_blank',
textContent: book.title || 'N/A'
textContent: book.title || 'N/A',
className: 'uk-link'
});
} else {
titleElement = document.createTextNode(book.title || 'N/A');
}
else {
titleElement = utils.createElement('td', { textContent: book.title || 'N/A' })
const titleCell = utils.createElement('td');
titleCell.appendChild(titleElement);
// Progress cell
const progressCell = utils.createElement('td');
if (status === 'downloading' && book.progress !== undefined) {
const progressBar = utils.createElement('progress', {
className: 'uk-progress',
value: book.progress,
max: 100
});
progressCell.appendChild(progressBar);
progressCell.appendChild(document.createTextNode(` ${Math.round(book.progress)}%`));
} else {
progressCell.textContent = '-';
}
const row = utils.createElement('tr', {}, [
// Actions cell
const actionsCell = utils.createElement('td');
if (status === 'queued' || status === 'downloading') {
const cancelBtn = utils.createElement('button', {
className: 'uk-button uk-button-danger uk-button-small',
textContent: 'Cancel',
onclick: () => queue.cancelDownload(book.id)
});
actionsCell.appendChild(cancelBtn);
}
const row = utils.createElement('tr', {
'data-book-id': book.id,
'data-status': status
}, [
statusCell,
utils.createElement('td', { textContent: book.id }),
titleElement,
this.createPreviewCell(book.preview)
priorityCell,
titleCell,
progressCell,
actionsCell
]);
elements.statusTableBody.appendChild(row);
@@ -838,6 +1009,26 @@ document.addEventListener('DOMContentLoaded', () => {
});
// Download selected books
elements.downloadSelectedButton.addEventListener('click', utils.handleDownloadSelected);
// Queue management buttons
const refreshButton = document.getElementById('refresh-status-button');
if (refreshButton) {
refreshButton.addEventListener('click', () => {
status.fetch();
queue.updateActiveDownloads();
});
}
const clearCompletedButton = document.getElementById('clear-completed-button');
if (clearCompletedButton) {
clearCompletedButton.addEventListener('click', () => {
UIkit.modal.confirm('Are you sure you want to clear all completed downloads?').then(() => {
queue.clearCompleted();
}, () => {
// User cancelled
});
});
}
// Check/uncheck all book checkboxes
elements.selectAllCheckbox.addEventListener('change', (event) => {
@@ -880,6 +1071,7 @@ document.addEventListener('DOMContentLoaded', () => {
debug.init(); // Initialize debug functionality
restart.init(); // Initialize restart functionality
status.fetch();
queue.updateActiveDownloads();
setInterval(() => status.fetch(), REFRESH_INTERVAL);
}

28
templates/index.html
View File

@@ -193,7 +193,7 @@
<!-- Status Section -->
<ul uk-accordion="animation: false" id="status-section">
<li id="search-accordion">
<a class="uk-accordion-title" href><h1 class="uk-heading-xsmall">Download Status</h1></a>
<a class="uk-accordion-title" href><h1 class="uk-heading-xsmall">Download Queue & Status</h1></a>
<div class="uk-accordion-content">
<div id="status-loading" class="uk-flex uk-flex-center" role="status" hidden>
<div uk-spinner="ratio: 2"></div>
@@ -201,13 +201,33 @@
</div>
<div class="status-content">
<div class="uk-overflow-auto">
<table id="status-table" class="uk-table uk-table-hover uk-table-divider" role="grid">
<!-- Queue Management Controls -->
<div class="uk-margin-small-bottom">
<div class="uk-flex uk-flex-between uk-flex-wrap uk-flex-middle">
<div class="uk-flex uk-flex-wrap uk-flex-middle">
<button class="uk-button uk-button-default uk-button-small uk-margin-small-right" id="refresh-status-button">
<span uk-icon="icon: refresh"></span> Refresh
</button>
<button class="uk-button uk-button-secondary uk-button-small uk-margin-small-right" id="clear-completed-button">
<span uk-icon="icon: trash"></span> Clear Completed
</button>
<span class="uk-text-small uk-text-muted uk-margin-small-right" id="active-downloads-count">Active: 0</span>
</div>
<div class="uk-flex uk-flex-middle">
<label class="uk-text-small uk-margin-small-right">Max Concurrent:</label>
<span class="uk-text-small uk-text-bold" id="max-concurrent-display">3</span>
</div>
</div>
</div>
<table id="status-table" class="uk-table uk-table-hover uk-table-divider uk-table-small" role="grid">
<thead>
<tr>
<th scope="col">Status</th>
<th scope="col">Book ID</th>
<th scope="col">Priority</th>
<th scope="col">Title</th>
<th scope="col">Preview</th>
<th scope="col">Progress</th>
<th scope="col">Actions</th>
</tr>
</thead>
<tbody>