72 lines
1.9 KiB
Python
72 lines
1.9 KiB
Python
import abc
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import dataclasses
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import datetime
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from collections.abc import Iterable, Mapping
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from decimal import Decimal
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import enforce_typing
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from fin_defs import Asset
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@enforce_typing.enforce_types
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@dataclasses.dataclass
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class Depo(abc.ABC):
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"""A depository tracking some amount of assets.
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Depo can either be DepoSingle, which is the base layer of the depository
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structure, or nested in DepoGroup, which allows for a complex hierarcy of
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depositories.
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The depository structure exposed by each backend depends upon the logical
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structure of the relevant service and the API of this service.
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"""
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name: str
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updated_time: datetime.datetime
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@abc.abstractmethod
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def assets(self) -> Iterable[Asset]:
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"""Returns the different assets managed by this depo."""
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@abc.abstractmethod
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def get_amount_of_asset(self, asset: Asset) -> Decimal:
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"""Returns the amount of owned assets for all nested depos.
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Must return 0 if depo does not contain the given asset.
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"""
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@enforce_typing.enforce_types
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@dataclasses.dataclass
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class DepoSingle(Depo):
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"""Base level of depository."""
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_assets: Mapping[Asset, Decimal]
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def assets(self) -> Iterable[Asset]:
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return self._assets
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def get_amount_of_asset(self, asset: Asset) -> Decimal:
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return self._assets.get(asset, Decimal(0))
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@enforce_typing.enforce_types
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@dataclasses.dataclass
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class DepoGroup(Depo):
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"""Nested depository."""
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nested: list[Depo]
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def assets(self) -> Iterable[Asset]:
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assets: list[Asset] = []
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for nested_depo in self.nested:
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assets.extend(nested_depo.assets())
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return assets
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def get_amount_of_asset(self, asset: Asset) -> Decimal:
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summed: Decimal = Decimal(0)
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for nested_depo in self.nested:
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summed += nested_depo.get_amount_of_asset(asset)
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del nested_depo
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return summed
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