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serializers.py
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# Copyright (C) 2020-2021 The Software Heritage developers
# See the AUTHORS file at the top-level directory of this distribution
# License: GNU General Public License version 3, or any later version
# See top-level LICENSE file for more information
"""Decoder and encoders for swh-model objects."""
from typing import Callable, Dict, List, Tuple
from swh.model import model, swhids
from swh.storage import interface
def _encode_model_object(obj):
d = obj.to_dict()
d["__type__"] = type(obj).__name__
return d
def _encode_enum(obj):
return {
"value": obj.value,
"__type__": type(obj).__name__,
}
def _decode_model_enum(d):
return getattr(model, d.pop("__type__"))(d["value"])
def _decode_swhids_enum(d):
return getattr(swhids, d.pop("__type__"))(d["value"])
def _decode_storage_enum(d):
return getattr(interface, d.pop("__type__"))(d["value"])
ENCODERS: List[Tuple[type, str, Callable]] = [
(model.BaseModel, "model", _encode_model_object),
(swhids.CoreSWHID, "core_swhid", str),
(swhids.ExtendedSWHID, "extended_swhid", str),
(swhids.QualifiedSWHID, "qualified_swhid", str),
# TODO: serialize this as "swhids_enum" when all peers support it in their DECODERS:
(swhids.ObjectType, "identifiers_enum", _encode_enum),
(model.MetadataAuthorityType, "model_enum", _encode_enum),
(interface.ListOrder, "storage_enum", _encode_enum),
]
DECODERS: Dict[str, Callable] = {
"core_swhid": swhids.CoreSWHID.from_string,
"extended_swhid": swhids.ExtendedSWHID.from_string,
"qualified_swhid": swhids.QualifiedSWHID.from_string,
"model": lambda d: getattr(model, d.pop("__type__")).from_dict(d),
"identifiers_enum": _decode_swhids_enum,
"swhids_enum": _decode_swhids_enum,
"model_enum": _decode_model_enum,
"storage_enum": _decode_storage_enum,
}

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