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mirror of https://github.com/janeczku/calibre-web synced 2024-12-23 00:20:31 +00:00
calibre-web/cps/tasks/thumbnail.py
2023-04-15 13:22:17 +02:00

523 lines
22 KiB
Python

# -*- coding: utf-8 -*-
# This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
# Copyright (C) 2020 monkey
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
from shutil import copyfile, copyfileobj
from urllib.request import urlopen
from .. import constants
from cps import config, db, fs, gdriveutils, logger, ub
from cps.services.worker import CalibreTask, STAT_CANCELLED, STAT_ENDED
from datetime import datetime
from sqlalchemy import func, text, or_
from flask_babel import lazy_gettext as N_
try:
from wand.image import Image
use_IM = True
except (ImportError, RuntimeError) as e:
use_IM = False
def get_resize_height(resolution):
return int(225 * resolution)
def get_resize_width(resolution, original_width, original_height):
height = get_resize_height(resolution)
percent = (height / float(original_height))
width = int((float(original_width) * float(percent)))
return width if width % 2 == 0 else width + 1
def get_best_fit(width, height, image_width, image_height):
resize_width = int(width / 2.0)
resize_height = int(height / 2.0)
aspect_ratio = image_width / image_height
# If this image's aspect ratio is different from the first image, then resize this image
# to fill the width and height of the first image
if aspect_ratio < width / height:
resize_width = int(width / 2.0)
resize_height = image_height * int(width / 2.0) / image_width
elif aspect_ratio > width / height:
resize_width = image_width * int(height / 2.0) / image_height
resize_height = int(height / 2.0)
return {'width': resize_width, 'height': resize_height}
class TaskGenerateCoverThumbnails(CalibreTask):
def __init__(self, book_id=-1, task_message=''):
super(TaskGenerateCoverThumbnails, self).__init__(task_message)
self.log = logger.create()
self.book_id = book_id
self.app_db_session = ub.get_new_session_instance()
# self.calibre_db = db.CalibreDB(expire_on_commit=False, init=True)
self.cache = fs.FileSystem()
self.resolutions = [
constants.COVER_THUMBNAIL_SMALL,
constants.COVER_THUMBNAIL_MEDIUM
]
def run(self, worker_thread):
if use_IM and self.stat != STAT_CANCELLED and self.stat != STAT_ENDED:
self.message = 'Scanning Books'
books_with_covers = self.get_books_with_covers(self.book_id)
count = len(books_with_covers)
total_generated = 0
for i, book in enumerate(books_with_covers):
# Generate new thumbnails for missing covers
generated = self.create_book_cover_thumbnails(book)
# Increment the progress
self.progress = (1.0 / count) * i
if generated > 0:
total_generated += generated
self.message = N_('Generated %(count)s cover thumbnails', count=total_generated)
# Check if job has been cancelled or ended
if self.stat == STAT_CANCELLED:
self.log.info(f'GenerateCoverThumbnails task has been cancelled.')
return
if self.stat == STAT_ENDED:
self.log.info(f'GenerateCoverThumbnails task has been ended.')
return
if total_generated == 0:
self.self_cleanup = True
self._handleSuccess()
self.app_db_session.remove()
def get_books_with_covers(self, book_id=-1):
filter_exp = (db.Books.id == book_id) if book_id != -1 else True
calibre_db = db.CalibreDB(expire_on_commit=False, init=True)
books_cover = calibre_db.session.query(db.Books).filter(db.Books.has_cover == 1).filter(filter_exp).all()
calibre_db.session.close()
return books_cover
def get_book_cover_thumbnails(self, book_id):
return self.app_db_session \
.query(ub.Thumbnail) \
.filter(ub.Thumbnail.type == constants.THUMBNAIL_TYPE_COVER) \
.filter(ub.Thumbnail.entity_id == book_id) \
.filter(or_(ub.Thumbnail.expiration.is_(None), ub.Thumbnail.expiration > datetime.utcnow())) \
.all()
def create_book_cover_thumbnails(self, book):
generated = 0
book_cover_thumbnails = self.get_book_cover_thumbnails(book.id)
# Generate new thumbnails for missing covers
resolutions = list(map(lambda t: t.resolution, book_cover_thumbnails))
missing_resolutions = list(set(self.resolutions).difference(resolutions))
for resolution in missing_resolutions:
generated += 1
self.create_book_cover_single_thumbnail(book, resolution)
# Replace outdated or missing thumbnails
for thumbnail in book_cover_thumbnails:
if book.last_modified.replace(tzinfo=None) > thumbnail.generated_at:
generated += 1
self.update_book_cover_thumbnail(book, thumbnail)
elif not self.cache.get_cache_file_exists(thumbnail.filename, constants.CACHE_TYPE_THUMBNAILS):
generated += 1
self.update_book_cover_thumbnail(book, thumbnail)
return generated
def create_book_cover_single_thumbnail(self, book, resolution):
thumbnail = ub.Thumbnail()
thumbnail.type = constants.THUMBNAIL_TYPE_COVER
thumbnail.entity_id = book.id
thumbnail.format = 'jpeg'
thumbnail.resolution = resolution
self.app_db_session.add(thumbnail)
try:
self.app_db_session.commit()
self.generate_book_thumbnail(book, thumbnail)
except Exception as ex:
self.log.debug('Error creating book thumbnail: ' + str(ex))
self._handleError('Error creating book thumbnail: ' + str(ex))
self.app_db_session.rollback()
def update_book_cover_thumbnail(self, book, thumbnail):
thumbnail.generated_at = datetime.utcnow()
try:
self.app_db_session.commit()
self.cache.delete_cache_file(thumbnail.filename, constants.CACHE_TYPE_THUMBNAILS)
self.generate_book_thumbnail(book, thumbnail)
except Exception as ex:
self.log.debug('Error updating book thumbnail: ' + str(ex))
self._handleError('Error updating book thumbnail: ' + str(ex))
self.app_db_session.rollback()
def generate_book_thumbnail(self, book, thumbnail):
if book and thumbnail:
if config.config_use_google_drive:
if not gdriveutils.is_gdrive_ready():
raise Exception('Google Drive is configured but not ready')
web_content_link = gdriveutils.get_cover_via_gdrive(book.path)
if not web_content_link:
raise Exception('Google Drive cover url not found')
stream = None
try:
stream = urlopen(web_content_link)
with Image(file=stream) as img:
filename = self.cache.get_cache_file_path(thumbnail.filename,
constants.CACHE_TYPE_THUMBNAILS)
height = get_resize_height(thumbnail.resolution)
if img.height > height:
width = get_resize_width(thumbnail.resolution, img.width, img.height)
img.resize(width=width, height=height, filter='lanczos')
img.format = thumbnail.format
img.save(filename=filename)
else:
with open(filename, 'rb') as fd:
copyfileobj(stream, fd)
except Exception as ex:
# Bubble exception to calling function
self.log.debug('Error generating thumbnail file: ' + str(ex))
raise ex
finally:
if stream is not None:
stream.close()
else:
book_cover_filepath = os.path.join(config.config_calibre_dir, book.path, 'cover.jpg')
if not os.path.isfile(book_cover_filepath):
raise Exception('Book cover file not found')
with Image(filename=book_cover_filepath) as img:
height = get_resize_height(thumbnail.resolution)
filename = self.cache.get_cache_file_path(thumbnail.filename, constants.CACHE_TYPE_THUMBNAILS)
if img.height > height:
width = get_resize_width(thumbnail.resolution, img.width, img.height)
img.resize(width=width, height=height, filter='lanczos')
img.format = thumbnail.format
img.save(filename=filename)
else:
# take cover as is
copyfile(book_cover_filepath, filename)
@property
def name(self):
return N_('Cover Thumbnails')
def __str__(self):
if self.book_id > 0:
return "Add Cover Thumbnails for Book {}".format(self.book_id)
else:
return "Generate Cover Thumbnails"
@property
def is_cancellable(self):
return True
class TaskGenerateSeriesThumbnails(CalibreTask):
def __init__(self, task_message=''):
super(TaskGenerateSeriesThumbnails, self).__init__(task_message)
self.log = logger.create()
self.app_db_session = ub.get_new_session_instance()
self.calibre_db = db.CalibreDB(expire_on_commit=False, init=True)
self.cache = fs.FileSystem()
self.resolutions = [
constants.COVER_THUMBNAIL_SMALL,
constants.COVER_THUMBNAIL_MEDIUM,
]
def run(self, worker_thread):
if self.calibre_db.session and use_IM and self.stat != STAT_CANCELLED and self.stat != STAT_ENDED:
self.message = 'Scanning Series'
all_series = self.get_series_with_four_plus_books()
count = len(all_series)
total_generated = 0
for i, series in enumerate(all_series):
generated = 0
series_thumbnails = self.get_series_thumbnails(series.id)
series_books = self.get_series_books(series.id)
# Generate new thumbnails for missing covers
resolutions = list(map(lambda t: t.resolution, series_thumbnails))
missing_resolutions = list(set(self.resolutions).difference(resolutions))
for resolution in missing_resolutions:
generated += 1
self.create_series_thumbnail(series, series_books, resolution)
# Replace outdated or missing thumbnails
for thumbnail in series_thumbnails:
if any(book.last_modified > thumbnail.generated_at for book in series_books):
generated += 1
self.update_series_thumbnail(series_books, thumbnail)
elif not self.cache.get_cache_file_exists(thumbnail.filename, constants.CACHE_TYPE_THUMBNAILS):
generated += 1
self.update_series_thumbnail(series_books, thumbnail)
# Increment the progress
self.progress = (1.0 / count) * i
if generated > 0:
total_generated += generated
self.message = N_('Generated {0} series thumbnails').format(total_generated)
# Check if job has been cancelled or ended
if self.stat == STAT_CANCELLED:
self.log.info(f'GenerateSeriesThumbnails task has been cancelled.')
return
if self.stat == STAT_ENDED:
self.log.info(f'GenerateSeriesThumbnails task has been ended.')
return
if total_generated == 0:
self.self_cleanup = True
self._handleSuccess()
self.app_db_session.remove()
def get_series_with_four_plus_books(self):
return self.calibre_db.session \
.query(db.Series) \
.join(db.books_series_link) \
.join(db.Books) \
.filter(db.Books.has_cover == 1) \
.group_by(text('books_series_link.series')) \
.having(func.count('book_series_link') > 3) \
.all()
def get_series_books(self, series_id):
return self.calibre_db.session \
.query(db.Books) \
.join(db.books_series_link) \
.join(db.Series) \
.filter(db.Books.has_cover == 1) \
.filter(db.Series.id == series_id) \
.all()
def get_series_thumbnails(self, series_id):
return self.app_db_session \
.query(ub.Thumbnail) \
.filter(ub.Thumbnail.type == constants.THUMBNAIL_TYPE_SERIES) \
.filter(ub.Thumbnail.entity_id == series_id) \
.filter(or_(ub.Thumbnail.expiration.is_(None), ub.Thumbnail.expiration > datetime.utcnow())) \
.all()
def create_series_thumbnail(self, series, series_books, resolution):
thumbnail = ub.Thumbnail()
thumbnail.type = constants.THUMBNAIL_TYPE_SERIES
thumbnail.entity_id = series.id
thumbnail.format = 'jpeg'
thumbnail.resolution = resolution
self.app_db_session.add(thumbnail)
try:
self.app_db_session.commit()
self.generate_series_thumbnail(series_books, thumbnail)
except Exception as ex:
self.log.debug('Error creating book thumbnail: ' + str(ex))
self._handleError('Error creating book thumbnail: ' + str(ex))
self.app_db_session.rollback()
def update_series_thumbnail(self, series_books, thumbnail):
thumbnail.generated_at = datetime.utcnow()
try:
self.app_db_session.commit()
self.cache.delete_cache_file(thumbnail.filename, constants.CACHE_TYPE_THUMBNAILS)
self.generate_series_thumbnail(series_books, thumbnail)
except Exception as ex:
self.log.debug('Error updating book thumbnail: ' + str(ex))
self._handleError('Error updating book thumbnail: ' + str(ex))
self.app_db_session.rollback()
def generate_series_thumbnail(self, series_books, thumbnail):
# Get the last four books in the series based on series_index
books = sorted(series_books, key=lambda b: float(b.series_index), reverse=True)[:4]
top = 0
left = 0
width = 0
height = 0
with Image() as canvas:
for book in books:
if config.config_use_google_drive:
if not gdriveutils.is_gdrive_ready():
raise Exception('Google Drive is configured but not ready')
web_content_link = gdriveutils.get_cover_via_gdrive(book.path)
if not web_content_link:
raise Exception('Google Drive cover url not found')
stream = None
try:
stream = urlopen(web_content_link)
with Image(file=stream) as img:
# Use the first image in this set to determine the width and height to scale the
# other images in this set
if width == 0 or height == 0:
width = get_resize_width(thumbnail.resolution, img.width, img.height)
height = get_resize_height(thumbnail.resolution)
canvas.blank(width, height)
dimensions = get_best_fit(width, height, img.width, img.height)
# resize and crop the image
img.resize(width=int(dimensions['width']), height=int(dimensions['height']),
filter='lanczos')
img.crop(width=int(width / 2.0), height=int(height / 2.0), gravity='center')
# add the image to the canvas
canvas.composite(img, left, top)
except Exception as ex:
self.log.debug('Error generating thumbnail file: ' + str(ex))
raise ex
finally:
if stream is not None:
stream.close()
book_cover_filepath = os.path.join(config.config_calibre_dir, book.path, 'cover.jpg')
if not os.path.isfile(book_cover_filepath):
raise Exception('Book cover file not found')
with Image(filename=book_cover_filepath) as img:
# Use the first image in this set to determine the width and height to scale the
# other images in this set
if width == 0 or height == 0:
width = get_resize_width(thumbnail.resolution, img.width, img.height)
height = get_resize_height(thumbnail.resolution)
canvas.blank(width, height)
dimensions = get_best_fit(width, height, img.width, img.height)
# resize and crop the image
img.resize(width=int(dimensions['width']), height=int(dimensions['height']), filter='lanczos')
img.crop(width=int(width / 2.0), height=int(height / 2.0), gravity='center')
# add the image to the canvas
canvas.composite(img, left, top)
# set the coordinates for the next iteration
if left == 0 and top == 0:
left = int(width / 2.0)
elif left == int(width / 2.0) and top == 0:
left = 0
top = int(height / 2.0)
else:
left = int(width / 2.0)
canvas.format = thumbnail.format
filename = self.cache.get_cache_file_path(thumbnail.filename, constants.CACHE_TYPE_THUMBNAILS)
canvas.save(filename=filename)
@property
def name(self):
return N_('Cover Thumbnails')
def __str__(self):
return "GenerateSeriesThumbnails"
@property
def is_cancellable(self):
return True
class TaskClearCoverThumbnailCache(CalibreTask):
def __init__(self, book_id, task_message=N_('Clearing cover thumbnail cache')):
super(TaskClearCoverThumbnailCache, self).__init__(task_message)
self.log = logger.create()
self.book_id = book_id
self.app_db_session = ub.get_new_session_instance()
self.cache = fs.FileSystem()
def run(self, worker_thread):
if self.app_db_session:
if self.book_id == 0: # delete superfluous thumbnails
calibre_db = db.CalibreDB(expire_on_commit=False, init=True)
thumbnails = (calibre_db.session.query(ub.Thumbnail)
.join(db.Books, ub.Thumbnail.entity_id == db.Books.id, isouter=True)
.filter(db.Books.id == None)
.all())
calibre_db.session.close()
elif self.book_id > 0: # make sure single book is selected
thumbnails = self.get_thumbnails_for_book(self.book_id)
if self.book_id < 0:
self.delete_all_thumbnails()
else:
for thumbnail in thumbnails:
self.delete_thumbnail(thumbnail)
self._handleSuccess()
self.app_db_session.remove()
def get_thumbnails_for_book(self, book_id):
return self.app_db_session \
.query(ub.Thumbnail) \
.filter(ub.Thumbnail.type == constants.THUMBNAIL_TYPE_COVER) \
.filter(ub.Thumbnail.entity_id == book_id) \
.all()
def delete_thumbnail(self, thumbnail):
try:
self.cache.delete_cache_file(thumbnail.filename, constants.CACHE_TYPE_THUMBNAILS)
self.app_db_session \
.query(ub.Thumbnail) \
.filter(ub.Thumbnail.type == constants.THUMBNAIL_TYPE_COVER) \
.filter(ub.Thumbnail.entity_id == thumbnail.entity_id) \
.delete()
self.app_db_session.commit()
except Exception as ex:
self.log.debug('Error deleting book thumbnail: ' + str(ex))
self._handleError('Error deleting book thumbnail: ' + str(ex))
def delete_all_thumbnails(self):
try:
self.app_db_session.query(ub.Thumbnail).filter(ub.Thumbnail.type == constants.THUMBNAIL_TYPE_COVER).delete()
self.app_db_session.commit()
self.cache.delete_cache_dir(constants.CACHE_TYPE_THUMBNAILS)
except Exception as ex:
self.log.debug('Error deleting thumbnail directory: ' + str(ex))
self._handleError('Error deleting thumbnail directory: ' + str(ex))
@property
def name(self):
return N_('Cover Thumbnails')
# needed for logging
def __str__(self):
if self.book_id > 0:
return "Replace/Delete Cover Thumbnails for book " + str(self.book_id)
else:
return "Delete Thumbnail cache directory"
@property
def is_cancellable(self):
return False