mirror of
https://github.com/RYDE-WORK/ballistica.git
synced 2026-01-21 22:33:58 +08:00
73 lines
2.2 KiB
Python
73 lines
2.2 KiB
Python
# Released under the MIT License. See LICENSE for details.
|
|
#
|
|
"""Custom json compressor/decompressor with support for more data times/etc."""
|
|
|
|
from __future__ import annotations
|
|
|
|
import datetime
|
|
import json
|
|
from typing import TYPE_CHECKING
|
|
|
|
if TYPE_CHECKING:
|
|
from typing import Any
|
|
|
|
# Special attr we included for our extended type information
|
|
# (extended-json-type)
|
|
TYPE_TAG = '_xjtp'
|
|
|
|
_pytz_utc: Any
|
|
|
|
# We don't *require* pytz since it must be installed through pip
|
|
# but it is used by firestore client for its utc tzinfos.
|
|
# (in which case it should be installed as a dependency anyway)
|
|
try:
|
|
import pytz
|
|
_pytz_utc = pytz.utc
|
|
except ModuleNotFoundError:
|
|
_pytz_utc = None # pylint: disable=invalid-name
|
|
|
|
|
|
class ExtendedJSONEncoder(json.JSONEncoder):
|
|
"""Custom json encoder supporting additional types."""
|
|
|
|
def default(self, o: Any) -> Any:
|
|
if isinstance(o, datetime.datetime):
|
|
|
|
# We only support timezone-aware utc times.
|
|
if (o.tzinfo is not datetime.timezone.utc
|
|
and (_pytz_utc is None or o.tzinfo is not _pytz_utc)):
|
|
raise ValueError(
|
|
'datetime values must have timezone set as timezone.utc')
|
|
return {
|
|
TYPE_TAG:
|
|
'dt',
|
|
'v': [
|
|
o.year, o.month, o.day, o.hour, o.minute, o.second,
|
|
o.microsecond
|
|
],
|
|
}
|
|
return super().default(o)
|
|
|
|
|
|
class ExtendedJSONDecoder(json.JSONDecoder):
|
|
"""Custom json decoder supporting extended types."""
|
|
|
|
def __init__(self, *args: Any, **kwargs: Any):
|
|
json.JSONDecoder.__init__(self,
|
|
object_hook=self.object_hook,
|
|
*args,
|
|
**kwargs)
|
|
|
|
def object_hook(self, obj: Any) -> Any: # pylint: disable=E0202
|
|
"""Custom hook."""
|
|
if TYPE_TAG not in obj:
|
|
return obj
|
|
objtype = obj[TYPE_TAG]
|
|
if objtype == 'dt':
|
|
vals = obj.get('v', [])
|
|
if len(vals) != 7:
|
|
raise ValueError('malformed datetime value')
|
|
return datetime.datetime( # type: ignore
|
|
*vals, tzinfo=datetime.timezone.utc)
|
|
return obj
|