95 lines
2.5 KiB
Python
95 lines
2.5 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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from typing import TypeVar
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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: set[Asset] = set()
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for nested_depo in self.nested:
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assets.update(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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T = TypeVar('T')
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class DepoFetcher(abc.ABC):
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"""Base `Depo` fetcher interface.
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Used to get depository information for specific websites/backends.
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"""
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@abc.abstractmethod
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def get_depo(self) -> Depo:
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"""Fetches the `Depo`s available for the fetcher, possibly as
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a `DepoGroup`.
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"""
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def assert_param(self, param_name: str, param_type: type[T], param_value: T) -> T:
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if not isinstance(param_value, param_type):
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msg = f'{self} expected {param_name} parameter of type {param_type}, but got: {param_value}'
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raise TypeError(msg)
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return param_value
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