Function getCurrencyRates

src/main/currencyRates.ts:107–168

()

}

export async function getCurrencyRates(): Promise<CurrencyRatesPayload> {
  const cached = store.currencyRates.get('cache')

  if (cached && Date.now() - cached.fetchedAt < CACHE_TTL) {
    return {
      ...cached,
      source: 'cache',
    }
  }

  try {
    const [fiatRates, cryptoRates] = await Promise.allSettled([
      fetchFiatRates(),
      fetchCryptoRates(),
    ])

    const freshRates: Record<string, number> = {}

    if (fiatRates.status === 'fulfilled') {
      Object.assign(freshRates, fiatRates.value)
    }

    if (cryptoRates.status === 'fulfilled') {
      Object.assign(freshRates, cryptoRates.value)
    }

    if (Object.keys(freshRates).length === 0) {
      throw new Error('No rates fetched')
    }

    if (
      !cached
      && (fiatRates.status !== 'fulfilled' || cryptoRates.status !== 'fulfilled')
    ) {
      return createPayload(freshRates)
    }

    const previousRates = cached?.rates || {}
    const payload = createPayload({ ...previousRates, ...freshRates })

    store.currencyRates.set('cache', {
      rates: payload.rates,
      fetchedAt: payload.fetchedAt,
    })

    return payload
  }
  catch {
    if (cached) {
      return {
        ...cached,
        source: 'cache',
      }
    }

    return {
      rates: {},
      fetchedAt: 0,