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import os
from datetime import datetime
from typing import Any, TypeAlias, Union
from app.Item import Item
from dataclasses import asdict
ItemDictValue: TypeAlias = Union[str, dict[str, "ItemDictValue"], list["ItemDictValue"]]
ItemDict: TypeAlias = dict[str, ItemDictValue]
def evaluate_env_ref(v: Any) -> str:
if type(v) == str and v.startswith("${") and v.endswith("}"):
return os.environ[v[2:-1]]
else:
return v
def get_config(config: dict[str, Any], key: str) -> Any:
v: Any
try:
v = config[key]
except KeyError:
raise Exception(f"no {key} field in config: " + str(config))
return evaluate_env_ref(v)
def get_config_or_default(
config: dict[str, Any], key: str, default: Any | None = None
) -> Any:
v: Any = config.get(key, default)
return evaluate_env_ref(v)
def item_to_dict(item: Item) -> ItemDict:
d = asdict(item)
d["pub_date"] = datetime.isoformat(d["pub_date"]) if d["pub_date"] else None
return d
def dict_to_item(d: ItemDict) -> Item:
pub_date, rest = (lambda pub_date, **rest: (pub_date, rest))(**d) # type: ignore
return Item(pub_date=datetime.fromisoformat(pub_date), **rest) # type: ignore
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