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455c74dcfa
* feat: add Binance support (Items, Accounts, Importers, Processor, and Sync) * refactor: deduplicate 'stablecoins' constant and push stale_rate filter to SQL --------- Signed-off-by: Juan José Mata <juanjo.mata@gmail.com> Co-authored-by: Juan José Mata <juanjo.mata@gmail.com>
46 lines
1.6 KiB
Ruby
46 lines
1.6 KiB
Ruby
# frozen_string_literal: true
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# Shared currency conversion helpers for Binance processors.
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# Converts USD amounts to the family's configured base currency using
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# ExchangeRate.find_or_fetch_rate (which has a built-in 5-day nearest-rate lookback).
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# When a fallback or no rate is used, sets a stale flag in account.extra["binance"].
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module BinanceAccount::UsdConverter
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private
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# Converts a USD amount to target_currency on the given date.
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# @return [Array(BigDecimal, Boolean, Date|nil)]
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# [converted_amount, stale, rate_date_used]
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# stale is false when the exact date rate was found, true otherwise.
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# rate_date_used is nil when exact rate was used or no rate found.
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def convert_from_usd(amount, date: Date.current)
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return [ amount, false, nil ] if target_currency == "USD"
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rate = ExchangeRate.find_or_fetch_rate(from: "USD", to: target_currency, date: date)
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if rate.nil?
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return [ amount.to_d, true, nil ]
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end
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converted = Money.new(amount, "USD").exchange_to(target_currency, fallback_rate: rate.rate).amount
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stale = rate.date != date
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rate_date = stale ? rate.date : nil
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[ converted, stale, rate_date ]
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end
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# Builds the hash to deep-merge into account.extra.
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def build_stale_extra(stale, rate_date, target_date)
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binance_meta = if stale
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{
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"stale_rate" => true,
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"rate_date_used" => rate_date&.to_s,
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"rate_target_date" => target_date.to_s
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}
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else
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{ "stale_rate" => false }
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end
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{ "binance" => binance_meta }
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end
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end
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