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parallel-library/cps/tasks/convert.py

199 lines
8.6 KiB
Python

from __future__ import division, print_function, unicode_literals
import sys
import os
import re
from glob import glob
from shutil import copyfile
from sqlalchemy.exc import SQLAlchemyError
from cps.services.worker import CalibreTask, STAT_FINISH_SUCCESS
from cps import calibre_db, db
from cps import logger, config
from cps.subproc_wrapper import process_open
from flask_babel import gettext as _
from cps.tasks.mail import TaskEmail
from cps import gdriveutils
log = logger.create()
class TaskConvert(CalibreTask):
def __init__(self, file_path, bookid, taskMessage, settings, kindle_mail):
super(TaskConvert, self).__init__(taskMessage)
self.file_path = file_path
self.bookid = bookid
self.settings = settings
self.kindle_mail = kindle_mail
self.results = dict()
def run(self, worker_thread):
self.worker_thread = worker_thread
filename = self._convert_ebook_format()
if filename:
if config.config_use_google_drive:
gdriveutils.updateGdriveCalibreFromLocal()
if self.kindle_mail:
# if we're sending to kindle after converting, create a one-off task and run it immediately
# todo: figure out how to incorporate this into the progress
try:
task = TaskEmail(self.settings['subject'], self.results["path"],
filename, self.settings, self.kindle_mail,
self.settings['subject'], self.settings['body'], internal=True)
task.start(worker_thread)
# even though the convert task might be finished, if this task fails, fail the whole thing
if task.stat != STAT_FINISH_SUCCESS:
raise Exception(task.error)
except Exception as e:
return self._handleError(str(e))
def _convert_ebook_format(self):
error_message = None
local_session = db.Session()
file_path = self.file_path
book_id = self.bookid
format_old_ext = u'.' + self.settings['old_book_format'].lower()
format_new_ext = u'.' + self.settings['new_book_format'].lower()
# check to see if destination format already exists -
# if it does - mark the conversion task as complete and return a success
# this will allow send to kindle workflow to continue to work
if os.path.isfile(file_path + format_new_ext):
log.info("Book id %d already converted to %s", book_id, format_new_ext)
cur_book = calibre_db.get_book(book_id)
self.results['path'] = file_path
self.results['title'] = cur_book.title
self._handleSuccess()
return file_path + format_new_ext
else:
log.info("Book id %d - target format of %s does not exist. Moving forward with convert.",
book_id,
format_new_ext)
if config.config_kepubifypath and format_old_ext == '.epub' and format_new_ext == '.kepub':
check, error_message = self._convert_kepubify(file_path,
format_old_ext,
format_new_ext)
else:
# check if calibre converter-executable is existing
if not os.path.exists(config.config_converterpath):
# ToDo Text is not translated
self._handleError(_(u"Calibre ebook-convert %(tool)s not found", tool=config.config_converterpath))
return
check, error_message = self._convert_calibre(file_path, format_old_ext, format_new_ext)
if check == 0:
cur_book = calibre_db.get_book(book_id)
if os.path.isfile(file_path + format_new_ext):
# self.db_queue.join()
new_format = db.Data(name=cur_book.data[0].name,
book_format=self.settings['new_book_format'].upper(),
book=book_id, uncompressed_size=os.path.getsize(file_path + format_new_ext))
try:
local_session.merge(new_format)
local_session.commit()
except SQLAlchemyError as e:
local_session.rollback()
log.error("Database error: %s", e)
4 years ago
return
self.results['path'] = cur_book.path
self.results['title'] = cur_book.title
if config.config_use_google_drive:
os.remove(file_path + format_old_ext)
self._handleSuccess()
return file_path + format_new_ext
else:
error_message = _('%(format)s format not found on disk', format=format_new_ext.upper())
log.info("ebook converter failed with error while converting book")
if not error_message:
error_message = _('Ebook converter failed with unknown error')
self._handleError(error_message)
return
def _convert_kepubify(self, file_path, format_old_ext, format_new_ext):
quotes = [1, 3]
command = [config.config_kepubifypath, (file_path + format_old_ext), '-o', os.path.dirname(file_path)]
try:
p = process_open(command, quotes)
except OSError as e:
return 1, _(u"Kepubify-converter failed: %(error)s", error=e)
self.progress = 0.01
while True:
nextline = p.stdout.readlines()
nextline = [x.strip('\n') for x in nextline if x != '\n']
if sys.version_info < (3, 0):
nextline = [x.decode('utf-8') for x in nextline]
for line in nextline:
log.debug(line)
if p.poll() is not None:
break
# ToD Handle
# process returncode
check = p.returncode
# move file
if check == 0:
converted_file = glob(os.path.join(os.path.dirname(file_path), "*.kepub.epub"))
if len(converted_file) == 1:
copyfile(converted_file[0], (file_path + format_new_ext))
os.unlink(converted_file[0])
else:
return 1, _(u"Converted file not found or more than one file in folder %(folder)s",
folder=os.path.dirname(file_path))
return check, None
def _convert_calibre(self, file_path, format_old_ext, format_new_ext):
try:
# Linux py2.7 encode as list without quotes no empty element for parameters
# linux py3.x no encode and as list without quotes no empty element for parameters
# windows py2.7 encode as string with quotes empty element for parameters is okay
# windows py 3.x no encode and as string with quotes empty element for parameters is okay
# separate handling for windows and linux
quotes = [1, 2]
command = [config.config_converterpath, (file_path + format_old_ext),
(file_path + format_new_ext)]
quotes_index = 3
if config.config_calibre:
parameters = config.config_calibre.split(" ")
for param in parameters:
command.append(param)
quotes.append(quotes_index)
quotes_index += 1
p = process_open(command, quotes)
except OSError as e:
return 1, _(u"Ebook-converter failed: %(error)s", error=e)
while p.poll() is None:
nextline = p.stdout.readline()
if os.name == 'nt' and sys.version_info < (3, 0):
nextline = nextline.decode('windows-1252')
elif os.name == 'posix' and sys.version_info < (3, 0):
nextline = nextline.decode('utf-8')
log.debug(nextline.strip('\r\n'))
# parse progress string from calibre-converter
progress = re.search(r"(\d+)%\s.*", nextline)
if progress:
self.progress = int(progress.group(1)) / 100
# process returncode
check = p.returncode
calibre_traceback = p.stderr.readlines()
error_message = ""
for ele in calibre_traceback:
if sys.version_info < (3, 0):
ele = ele.decode('utf-8')
log.debug(ele.strip('\n'))
if not ele.startswith('Traceback') and not ele.startswith(' File'):
error_message = _("Calibre failed with error: %(error)s", error=ele.strip('\n'))
return check, error_message
@property
def name(self):
return "Convert"