示例#1
0
    def write_metadata_cache(self, storage, bl):
        from calibre.devices.mtp.books import JSONCodec

        if bl.storage_id != storage.storage_id:
            # Just a sanity check, should never happen
            return

        json_codec = JSONCodec()
        stream = SpooledTemporaryFile(10*(1024**2))
        json_codec.encode_to_file(stream, bl)
        size = stream.tell()
        stream.seek(0)
        self.put_calibre_file(storage, 'metadata', stream, size)
示例#2
0
    def books(self, oncard=None, end_session=True):
        from calibre.devices.mtp.books import JSONCodec
        from calibre.devices.mtp.books import BookList, Book
        self.report_progress(0, _('Listing files, this can take a while'))
        self.get_driveinfo()  # Ensure driveinfo is loaded
        sid = {'carda':self._carda_id, 'cardb':self._cardb_id}.get(oncard,
                self._main_id)
        if sid is None:
            return BookList(None)

        bl = BookList(sid)
        # If True then there is a mismatch between the ebooks on the device and
        # the metadata cache
        need_sync = False
        all_books = list(self.filesystem_cache.iterebooks(sid))
        steps = len(all_books) + 2
        count = 0

        self.report_progress(0, _('Reading e-book metadata'))
        # Read the cache if it exists
        storage = self.filesystem_cache.storage(sid)
        cache = storage.find_path(self.calibre_file_paths['metadata'].split('/'))
        if cache is not None:
            json_codec = JSONCodec()
            try:
                stream = self.get_mtp_file(cache)
                json_codec.decode_from_file(stream, bl, Book, sid)
            except:
                need_sync = True

        relpath_cache = {b.mtp_relpath:i for i, b in enumerate(bl)}

        for mtp_file in all_books:
            count += 1
            relpath = mtp_file.mtp_relpath
            idx = relpath_cache.get(relpath, None)
            if idx is not None:
                cached_metadata = bl[idx]
                del relpath_cache[relpath]
                if cached_metadata.size == mtp_file.size:
                    cached_metadata.datetime = mtp_file.last_modified.timetuple()
                    cached_metadata.path = mtp_file.mtp_id_path
                    debug('Using cached metadata for',
                            '/'.join(mtp_file.full_path))
                    continue  # No need to update metadata
                book = cached_metadata
            else:
                book = Book(sid, '/'.join(relpath))
                bl.append(book)

            need_sync = True
            self.report_progress(count/steps, _('Reading metadata from %s')%
                    ('/'.join(relpath)))
            try:
                book.smart_update(self.read_file_metadata(mtp_file))
                debug('Read metadata for', '/'.join(mtp_file.full_path))
            except:
                prints('Failed to read metadata from',
                        '/'.join(mtp_file.full_path))
                traceback.print_exc()
            book.size = mtp_file.size
            book.datetime = mtp_file.last_modified.timetuple()
            book.path = mtp_file.mtp_id_path

        # Remove books in the cache that no longer exist
        for idx in sorted(relpath_cache.itervalues(), reverse=True):
            del bl[idx]
            need_sync = True

        if need_sync:
            self.report_progress(count/steps, _('Updating metadata cache on device'))
            self.write_metadata_cache(storage, bl)
        self.report_progress(1, _('Finished reading metadata from device'))
        return bl