state_attributes.py

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"""State attributes models."""
 
from __future__ import annotations
 
import logging
from typing import Any
 
from homeassistant.util.json import json_loads_object
 
EMPTY_JSON_OBJECT = "{}"
_LOGGER = logging.getLogger(__name__)
 
 
def decode_attributes_from_source(
    source: Any, attr_cache: dict[str, dict[str, Any]]
) -> dict[str, Any]:
    """Decode attributes from a row source."""
    if not source or source == EMPTY_JSON_OBJECT:
        return {}
    if (attributes := attr_cache.get(source)) is not None:
        return attributes
    try:
        attr_cache[source] = attributes = json_loads_object(source)
    except ValueError:
        _LOGGER.exception("Error converting row to state attributes: %s", source)
        attr_cache[source] = attributes = {}
    return attributes