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from __future__ import annotations
from datetime import datetime
from json import dumps, loads
from typing import Any
from uuid import UUID
import attrs
from ..abc import Serializer
from ..marshalling import marshal_date, marshal_object, unmarshal_object
@attrs.define(kw_only=True, eq=False)
class JSONSerializer(Serializer):
magic_key: str = "_apscheduler_json"
dump_options: dict[str, Any] = attrs.field(factory=dict)
load_options: dict[str, Any] = attrs.field(factory=dict)
def __attrs_post_init__(self):
self.dump_options["default"] = self._default_hook
self.load_options["object_hook"] = self._object_hook
def _default_hook(self, obj):
if isinstance(obj, datetime):
return marshal_date(obj)
elif isinstance(obj, UUID):
return str(obj)
elif isinstance(obj, frozenset):
return list(obj)
elif hasattr(obj, "__getstate__"):
cls_ref, state = marshal_object(obj)
return {self.magic_key: [cls_ref, state]}
raise TypeError(
f"Object of type {obj.__class__.__name__!r} is not JSON serializable"
)
def _object_hook(self, obj_state: dict[str, Any]):
if self.magic_key in obj_state:
ref, state = obj_state[self.magic_key]
return unmarshal_object(ref, state)
return obj_state
def serialize(self, obj) -> bytes:
return dumps(obj, ensure_ascii=False, **self.dump_options).encode("utf-8")
def deserialize(self, serialized: bytes):
return loads(serialized, **self.load_options)
def serialize_to_unicode(self, obj) -> str:
return dumps(obj, ensure_ascii=False, **self.dump_options)
def deserialize_from_unicode(self, serialized: str):
return loads(serialized, **self.load_options)
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