X-Git-Url: https://git.mdrn.pl/wolnelektury.git/blobdiff_plain/19bfea4bfc35c814854192e8bf67a6ad584f44c2..031b8be3bf03baa724dd7e225b0555726d089341:/src/catalogue/fields.py

diff --git a/src/catalogue/fields.py b/src/catalogue/fields.py
index 80d016c58..c592c5504 100644
--- a/src/catalogue/fields.py
+++ b/src/catalogue/fields.py
@@ -1,19 +1,32 @@
 # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
 #
+import os
 from django.conf import settings
 from django.core.files import File
-from django.core.files.storage import FileSystemStorage
 from django.db import models
 from django.db.models.fields.files import FieldFile
-from catalogue import app_settings
-from catalogue.constants import LANGUAGES_3TO2
-from catalogue.utils import remove_zip, truncate_html_words, gallery_path, gallery_url
-from celery.task import Task, task
-from celery.utils.log import get_task_logger
+from django.utils.deconstruct import deconstructible
+from django.utils.translation import gettext_lazy as _
+from catalogue.constants import LANGUAGES_3TO2, EBOOK_FORMATS_WITH_CHILDREN, EBOOK_FORMATS_WITHOUT_CHILDREN
+from catalogue.utils import absolute_url, remove_zip, truncate_html_words, gallery_path, gallery_url
 from waiter.utils import clear_cache
 
-task_logger = get_task_logger(__name__)
+ETAG_SCHEDULED_SUFFIX = '-scheduled'
+EBOOK_BUILD_PRIORITY = 0
+EBOOK_REBUILD_PRIORITY = 9
+
+
+@deconstructible
+class UploadToPath(object):
+    def __init__(self, path):
+        self.path = path
+
+    def __call__(self, instance, filename):
+        return self.path % instance.slug
+
+    def __eq__(self, other):
+        return isinstance(other, type(self)) and other.path == self.path
 
 
 class EbookFieldFile(FieldFile):
@@ -21,82 +34,135 @@ class EbookFieldFile(FieldFile):
 
     def build(self):
         """Build the ebook immediately."""
-        return self.field.builder.build(self)
+        etag = self.field.get_current_etag()
+        self.field.build(self)
+        self.update_etag(etag)
+        self.instance.clear_cache()
 
-    def build_delay(self):
+    def build_delay(self, priority=EBOOK_BUILD_PRIORITY):
         """Builds the ebook in a delayed task."""
-        return self.field.builder.delay(self.instance, self.field.attname)
+        from .tasks import build_field
 
-    def get_url(self):
-        return self.instance.media_url(self.field.attname.split('_')[0])
+        self.update_etag(
+            "".join([self.field.get_current_etag(), ETAG_SCHEDULED_SUFFIX])
+        )
+        return build_field.apply_async(
+            [self.instance.pk, self.field.attname],
+            priority=priority
+        )
 
     def set_readable(self, readable):
         import os
         permissions = 0o644 if readable else 0o600
         os.chmod(self.path, permissions)
 
+    def update_etag(self, etag):
+        setattr(self.instance, self.field.etag_field_name, etag)
+        if self.instance.pk:
+            self.instance.save(update_fields=[self.field.etag_field_name])
+
 
 class EbookField(models.FileField):
     """Represents an ebook file field, attachable to a model."""
     attr_class = EbookFieldFile
+    ext = None
+    librarian2_api = False
+    ZIP = None
+
+    def __init__(self, verbose_name=None, with_etag=True, etag_field_name=None, **kwargs):
+        kwargs.setdefault('verbose_name', verbose_name)
+        self.with_etag = with_etag
+        self.etag_field_name = etag_field_name
+        kwargs.setdefault('max_length', 255)
+        kwargs.setdefault('blank', True)
+        kwargs.setdefault('default', '')
+        kwargs.setdefault('upload_to', self.get_upload_to(self.ext))
 
-    def __init__(self, format_name, *args, **kwargs):
-        super(EbookField, self).__init__(*args, **kwargs)
-        self.format_name = format_name
+        super().__init__(**kwargs)
 
     def deconstruct(self):
-        name, path, args, kwargs = super(EbookField, self).deconstruct()
-        args.insert(0, self.format_name)
+        name, path, args, kwargs = super().deconstruct()
+        if kwargs.get('max_length') == 255:
+            del kwargs['max_length']
+        if kwargs.get('blank') is True:
+            del kwargs['blank']
+        if kwargs.get('default') == '':
+            del kwargs['default']
+        if self.get_upload_to(self.ext) == kwargs.get('upload_to'):
+            del kwargs['upload_to']
+        # with_etag creates a second field, which then deconstructs to manage
+        # its own migrations. So for migrations, etag_field_name is explicitly
+        # set to avoid double creation of the etag field.
+        if self.with_etag:
+            kwargs['etag_field_name'] = self.etag_field_name
+        else:
+            kwargs['with_etag'] = self.with_etag
+
         return name, path, args, kwargs
 
-    @property
-    def builder(self):
-        """Finds a celery task suitable for the format of the field."""
-        return BuildEbook.for_format(self.format_name)
+    @classmethod
+    def get_upload_to(cls, directory):
+        directory = getattr(cls, 'directory', cls.ext)
+        upload_template = f'book/{directory}/%s.{cls.ext}'
+        return UploadToPath(upload_template)
 
     def contribute_to_class(self, cls, name):
         super(EbookField, self).contribute_to_class(cls, name)
 
+        if self.with_etag and not self.etag_field_name:
+            self.etag_field_name = f'{name}_etag'
+            self.etag_field = models.CharField(max_length=255, editable=False, default='', db_index=True)
+            self.etag_field.contribute_to_class(cls, f'{name}_etag')
+
         def has(model_instance):
             return bool(getattr(model_instance, self.attname, None))
         has.__doc__ = None
         has.__name__ = str("has_%s" % self.attname)
         has.short_description = self.name
         has.boolean = True
-        setattr(cls, 'has_%s' % self.attname, has)
-
 
-class BuildEbook(Task):
-    formats = {}
+        setattr(cls, 'has_%s' % self.attname, has)
 
-    @classmethod
-    def register(cls, format_name):
-        """A decorator for registering subclasses for particular formats."""
-        def wrapper(builder):
-            cls.formats[format_name] = builder
-            return builder
-        return wrapper
+    def get_current_etag(self):
+        import pkg_resources
+        librarian_version = pkg_resources.get_distribution("librarian").version
+        return librarian_version
+
+    def schedule_stale(self, queryset=None):
+        """Schedule building this format for all the books where etag is stale."""
+        # If there is not ETag field, bail. That's true for xml file field.
+        if not self.with_etag:
+            return
+
+        etag = self.get_current_etag()
+        if queryset is None:
+            queryset = self.model.objects.all()
+
+        if self.format_name in EBOOK_FORMATS_WITHOUT_CHILDREN + ['html']:
+            queryset = queryset.filter(children=None)
+
+        queryset = queryset.exclude(**{
+            f'{self.etag_field_name}__in': [
+                etag, f'{etag}{ETAG_SCHEDULED_SUFFIX}'
+            ]
+        })
+        for obj in queryset:
+            fieldfile = getattr(obj, self.attname)
+            priority = EBOOK_REBUILD_PRIORITY if fieldfile else EBOOK_BUILD_PRIORITY
+            fieldfile.build_delay(priority=priority)
 
     @classmethod
-    def for_format(cls, format_name):
-        """Returns a celery task suitable for specified format."""
-        return cls.formats.get(format_name, BuildEbookTask)
+    def schedule_all_stale(cls, model):
+        """Schedules all stale ebooks of all formats to rebuild."""
+        for field in model._meta.fields:
+            if isinstance(field, cls):
+                field.schedule_stale()
 
     @staticmethod
-    def transform(wldoc, fieldfile):
+    def transform(wldoc):
         """Transforms an librarian.WLDocument into an librarian.OutputFile.
-
-        By default, it just calls relevant wldoc.as_??? method.
-
         """
-        return getattr(wldoc, "as_%s" % fieldfile.field.format_name)()
-
-    def run(self, obj, field_name):
-        """Just run `build` on FieldFile, can't pass it directly to Celery."""
-        task_logger.info("%s -> %s" % (obj.slug, field_name))
-        ret = self.build(getattr(obj, field_name))
-        obj.clear_cache()
-        return ret
+        raise NotImplemented()
 
     def set_file_permissions(self, fieldfile):
         if fieldfile.instance.preview:
@@ -104,63 +170,88 @@ class BuildEbook(Task):
 
     def build(self, fieldfile):
         book = fieldfile.instance
-        out = self.transform(book.wldocument(), fieldfile)
-        fieldfile.save(None, File(open(out.get_filename(), 'rb')), save=False)
+        out = self.transform(
+            book.wldocument2() if self.librarian2_api else book.wldocument(),
+        )
+        with open(out.get_filename(), 'rb') as f:
+            fieldfile.save(None, File(f), save=False)
         self.set_file_permissions(fieldfile)
         if book.pk is not None:
-            books = type(book).objects.filter(pk=book.pk)
-            books.update(**{
-                fieldfile.field.attname: fieldfile
-            })
-            for book in books:
-                book.save()  # just to trigger post-save
-        if fieldfile.field.format_name in app_settings.FORMAT_ZIPS:
-            remove_zip(app_settings.FORMAT_ZIPS[fieldfile.field.format_name])
-# Don't decorate BuildEbook, because we want to subclass it.
-BuildEbookTask = task(BuildEbook, ignore_result=True)
+            book.save(update_fields=[self.attname])
+        if self.ZIP:
+            remove_zip(self.ZIP)
 
 
-@BuildEbook.register('txt')
-@task(ignore_result=True)
-class BuildTxt(BuildEbook):
+class XmlField(EbookField):
+    ext = 'xml'
+
+    def build(self, fieldfile):
+        pass
+
+
+class TxtField(EbookField):
+    ext = 'txt'
+
     @staticmethod
-    def transform(wldoc, fieldfile):
+    def transform(wldoc):
         return wldoc.as_text()
 
 
-@BuildEbook.register('pdf')
-@task(ignore_result=True)
-class BuildPdf(BuildEbook):
+class Fb2Field(EbookField):
+    ext = 'fb2'
+    ZIP = 'wolnelektury_pl_fb2'
+
+    @staticmethod
+    def transform(wldoc):
+        return wldoc.as_fb2()
+
+
+class PdfField(EbookField):
+    ext = 'pdf'
+    ZIP = 'wolnelektury_pl_pdf'
+
     @staticmethod
-    def transform(wldoc, fieldfile):
+    def transform(wldoc):
         return wldoc.as_pdf(
             morefloats=settings.LIBRARIAN_PDF_MOREFLOATS, cover=True,
-            ilustr_path=gallery_path(wldoc.book_info.url.slug), customizations=['notoc'])
+            base_url=absolute_url(gallery_url(wldoc.book_info.url.slug)), customizations=['notoc'])
 
     def build(self, fieldfile):
-        BuildEbook.build(self, fieldfile)
+        super().build(fieldfile)
         clear_cache(fieldfile.instance.slug)
 
 
-@BuildEbook.register('epub')
-@task(ignore_result=True)
-class BuildEpub(BuildEbook):
+class EpubField(EbookField):
+    ext = 'epub'
+    librarian2_api = True
+    ZIP = 'wolnelektury_pl_epub'
+
     @staticmethod
-    def transform(wldoc, fieldfile):
-        return wldoc.as_epub(cover=True, ilustr_path=gallery_path(wldoc.book_info.url.slug))
+    def transform(wldoc):
+        from librarian.builders import EpubBuilder
+        return EpubBuilder(
+                base_url='file://' + os.path.abspath(gallery_path(wldoc.meta.url.slug)) + '/',
+                fundraising=settings.EPUB_FUNDRAISING
+            ).build(wldoc)
+
 
+class MobiField(EbookField):
+    ext = 'mobi'
+    librarian2_api = True
+    ZIP = 'wolnelektury_pl_mobi'
 
-@BuildEbook.register('mobi')
-@task(ignore_result=True)
-class BuildMobi(BuildEbook):
     @staticmethod
-    def transform(wldoc, fieldfile):
-        return wldoc.as_mobi(cover=True, ilustr_path=gallery_path(wldoc.book_info.url.slug))
+    def transform(wldoc):
+        from librarian.builders import MobiBuilder
+        return MobiBuilder(
+                base_url='file://' + os.path.abspath(gallery_path(wldoc.meta.url.slug)) + '/',
+                fundraising=settings.EPUB_FUNDRAISING
+            ).build(wldoc)
 
 
-@BuildEbook.register('html')
-@task(ignore_result=True)
-class BuildHtml(BuildEbook):
+class HtmlField(EbookField):
+    ext = 'html'
+
     def build(self, fieldfile):
         from django.core.files.base import ContentFile
         from slugify import slugify
@@ -170,7 +261,7 @@ class BuildHtml(BuildEbook):
 
         book = fieldfile.instance
 
-        html_output = self.transform(book.wldocument(parse_dublincore=False), fieldfile)
+        html_output = self.transform(book.wldocument(parse_dublincore=False))
 
         # Delete old fragments, create from scratch if necessary.
         book.fragments.all().delete()
@@ -250,78 +341,75 @@ class BuildHtml(BuildEbook):
         return False
 
     @staticmethod
-    def transform(wldoc, fieldfile):
+    def transform(wldoc):
         # ugly, but we can't use wldoc.book_info here
         from librarian import DCNS
         url_elem = wldoc.edoc.getroot().find('.//' + DCNS('identifier.url'))
         if url_elem is None:
-            gallery = ''
+            gal_url = ''
+            gal_path = ''
         else:
-            gallery = gallery_url(slug=url_elem.text.rsplit('/', 1)[1])
-        return wldoc.as_html(options={'gallery': "'%s'" % gallery})
+            slug = url_elem.text.rstrip('/').rsplit('/', 1)[1]
+            gal_url = gallery_url(slug=slug)
+            gal_path = gallery_path(slug=slug)
+        return wldoc.as_html(gallery_path=gal_path, gallery_url=gal_url, base_url=absolute_url(gal_url))
+
 
+class CoverField(EbookField):
+    ext = 'jpg'
+    directory = 'cover'
+
+    @staticmethod
+    def transform(wldoc):
+        return wldoc.as_cover()
 
-class BuildCover(BuildEbook):
     def set_file_permissions(self, fieldfile):
         pass
 
 
-@BuildEbook.register('cover_thumb')
-@task(ignore_result=True)
-class BuildCoverThumb(BuildCover):
-    @classmethod
-    def transform(cls, wldoc, fieldfile):
+class CoverCleanField(CoverField):
+    directory = 'cover_clean'
+
+    @staticmethod
+    def transform(wldoc):
+        if wldoc.book_info.cover_box_position == 'none':
+            from librarian.cover import WLCover
+            return WLCover(wldoc.book_info, width=240).output_file()
+        from librarian.covers.marquise import MarquiseCover
+        return MarquiseCover(wldoc.book_info, width=240).output_file()
+
+
+class CoverThumbField(CoverField):
+    directory = 'cover_thumb'
+
+    @staticmethod
+    def transform(wldoc):
         from librarian.cover import WLCover
         return WLCover(wldoc.book_info, height=193).output_file()
 
 
-@BuildEbook.register('cover_api_thumb')
-@task(ignore_result=True)
-class BuildCoverApiThumb(BuildCover):
-    @classmethod
-    def transform(cls, wldoc, fieldfile):
+class CoverApiThumbField(CoverField):
+    directory = 'cover_api_thumb'
+
+    @staticmethod
+    def transform(wldoc):
         from librarian.cover import WLNoBoxCover
         return WLNoBoxCover(wldoc.book_info, height=500).output_file()
 
 
-@BuildEbook.register('simple_cover')
-@task(ignore_result=True)
-class BuildSimpleCover(BuildCover):
-    @classmethod
-    def transform(cls, wldoc, fieldfile):
+class SimpleCoverField(CoverField):
+    directory = 'cover_simple'
+
+    @staticmethod
+    def transform(wldoc):
         from librarian.cover import WLNoBoxCover
         return WLNoBoxCover(wldoc.book_info, height=1000).output_file()
 
 
-@BuildEbook.register('cover_ebookpoint')
-@task(ignore_result=True)
-class BuildCoverEbookpoint(BuildCover):
-    @classmethod
-    def transform(cls, wldoc, fieldfile):
+class CoverEbookpointField(CoverField):
+    directory = 'cover_ebookpoint'
+
+    @staticmethod
+    def transform(wldoc):
         from librarian.cover import EbookpointCover
         return EbookpointCover(wldoc.book_info).output_file()
-
-
-# not used, but needed for migrations
-class OverwritingFieldFile(FieldFile):
-    """
-        Deletes the old file before saving the new one.
-    """
-
-    def save(self, name, content, *args, **kwargs):
-        leave = kwargs.pop('leave', None)
-        # delete if there's a file already and there's a new one coming
-        if not leave and self and (not hasattr(content, 'path') or content.path != self.path):
-            self.delete(save=False)
-        return super(OverwritingFieldFile, self).save(name, content, *args, **kwargs)
-
-
-class OverwritingFileField(models.FileField):
-    attr_class = OverwritingFieldFile
-
-
-class OverwriteStorage(FileSystemStorage):
-
-    def get_available_name(self, name, max_length=None):
-        self.delete(name)
-        return name