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Serialization of FieldMetadata

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Kovid Goyal 2017-05-01 13:02:23 +05:30
parent 37309b8c56
commit 40bbe91c0c
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1 changed files with 12 additions and 3 deletions
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15
src/calibre/utils/serialize.py
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@ -8,6 +8,8 @@ import json, base64
from functools import partial
from datetime import datetime
import msgpack
from calibre.utils.iso8601 import parse_iso8601
MSGPACK_MIME = 'application/x-msgpack'
@ -23,16 +25,18 @@ def encoder(obj, for_json=False):
return encoded(0, unicode(obj.isoformat()))
if isinstance(obj, (set, frozenset)):
return encoded(1, tuple(obj))
if obj.__class__.__name__ == 'Metadata':
if hasattr(obj, '__calibre_serializable__'):
from calibre.ebooks.metadata.book.base import Metadata
from calibre.library.field_metadata import FieldMetadata, fm_as_dict
if isinstance(obj, Metadata):
from calibre.ebooks.metadata.book.serialize import metadata_as_dict
return encoded(2, metadata_as_dict(obj, encode_cover_data=for_json))
elif isinstance(obj, FieldMetadata):
return encoded(3, fm_as_dict(obj))
raise TypeError('Cannot serialize objects of type {}'.format(type(obj)))
def msgpack_dumps(data):
import msgpack
return msgpack.packb(data, use_bin_type=True, default=encoder)
@ -55,10 +59,16 @@ def decode_metadata(x, for_json):
return obj
def decode_field_metadata(x, for_json):
from calibre.library.field_metadata import fm_from_dict
return fm_from_dict(x)
decoders = (
lambda x, fj: parse_iso8601(x, assume_utc=True),
lambda x, fj: set(x),
decode_metadata,
decode_field_metadata,
)
@ -70,7 +80,6 @@ def decoder(obj, for_json=False):
def msgpack_loads(data):
import msgpack
return msgpack.unpackb(data, encoding='utf-8', object_hook=decoder)