X-Git-Url: https://git.mdrn.pl/wolnelektury.git/blobdiff_plain/2d8bcd45b873aa01d43b07d0179d373e0bdc9bb5..b9bf77dc8f2d4b1b64bd7a29730bec3e3f885a6e:/apps/catalogue/utils.py diff --git a/apps/catalogue/utils.py b/apps/catalogue/utils.py index 368f96d20..acbd778cd 100644 --- a/apps/catalogue/utils.py +++ b/apps/catalogue/utils.py @@ -2,16 +2,28 @@ # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later. # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information. # +from __future__ import with_statement + import random import time from base64 import urlsafe_b64encode +from django.http import HttpResponse, HttpResponseRedirect, Http404, HttpResponsePermanentRedirect from django.core.files.uploadedfile import UploadedFile +from django.core.files.base import File +from django.core.files.storage import DefaultStorage from django.utils.hashcompat import sha_constructor from django.conf import settings +from celery.task import task +from os import mkdir, path, unlink +from errno import EEXIST, ENOENT +from fcntl import flock, LOCK_EX +from zipfile import ZipFile from librarian import DocProvider - +from reporting.utils import read_chunks +from celery.task import task +import catalogue.models # Use the system (hardware-based) random number generator if it exists. if hasattr(random, 'SystemRandom'): @@ -48,14 +60,107 @@ class ExistingFile(UploadedFile): pass -class BookImportDocProvider(DocProvider): - """Used for joined EPUB and PDF files.""" +class ORMDocProvider(DocProvider): + """Used for getting books' children.""" def __init__(self, book): self.book = book - def by_slug(self, slug): - if slug == self.book.slug: - return self.book.xml_file + def by_slug_and_lang(self, slug, language): + if slug == self.book.slug and language == self.language: + return open(self.book.xml_file.path) else: - return type(self.book).objects.get(slug=slug).xml_file + return type(self.book).objects.get( + slug=slug, language=language).xml_file + + +class LockFile(object): + """ + A file lock monitor class; createas an ${objname}.lock + file in directory dir, and locks it exclusively. + To be used in 'with' construct. + """ + def __init__(self, dir, objname): + self.lockname = path.join(dir, objname + ".lock") + + def __enter__(self): + self.lock = open(self.lockname, 'w') + flock(self.lock, LOCK_EX) + + def __exit__(self, *err): + try: + unlink(self.lockname) + except OSError as oe: + if oe.errno != oe.EEXIST: + raise oe + self.lock.close() + + +@task +def create_zip(paths, zip_slug): + """ + Creates a zip in MEDIA_ROOT/zip directory containing files from path. + Resulting archive filename is ${zip_slug}.zip + Returns it's path relative to MEDIA_ROOT (no initial slash) + """ + # directory to store zip files + zip_path = path.join(settings.MEDIA_ROOT, 'zip') + + try: + mkdir(zip_path) + except OSError as oe: + if oe.errno != EEXIST: + raise oe + zip_filename = zip_slug + ".zip" + + with LockFile(zip_path, zip_slug): + if not path.exists(path.join(zip_path, zip_filename)): + zipf = ZipFile(path.join(zip_path, zip_filename), 'w') + try: + for arcname, p in paths: + if arcname is None: + arcname = path.basename(p) + zipf.write(p, arcname) + finally: + zipf.close() + + return 'zip/' + zip_filename + + +def remove_zip(zip_slug): + """ + removes the ${zip_slug}.zip file from zip store. + """ + zip_file = path.join(settings.MEDIA_ROOT, 'zip', zip_slug + '.zip') + try: + unlink(zip_file) + except OSError as oe: + if oe.errno != ENOENT: + raise oe + + +class AttachmentHttpResponse(HttpResponse): + """Response serving a file to be downloaded. + """ + def __init__ (self, file_path, file_name, mimetype): + super(AttachmentHttpResponse, self).__init__(mimetype=mimetype) + self['Content-Disposition'] = 'attachment; filename=%s' % file_name + self.file_path = file_path + self.file_name = file_name + + with open(DefaultStorage().path(self.file_path)) as f: + for chunk in read_chunks(f): + self.write(chunk) + +@task +def async_build_pdf(book_id, customizations, file_name): + """ + A celery task to generate pdf files. + Accepts the same args as Book.build_pdf, but with book id as first parameter + instead of Book instance + """ + book = catalogue.models.Book.objects.get(id=book_id) + print "will gen %s" % DefaultStorage().path(file_name) + if not DefaultStorage().exists(file_name): + book.build_pdf(customizations=customizations, file_name=file_name) + print "done."