fixup! Add new ramp plugin scenes

- Simplify fetchExchangeRatesForFiat to use getHistoricalRate with current date
- Remove unused useExchangeRateLoader hook

Author: samholmes

src/actions/ExchangeRateActions.ts

@@ -359,117 +359,3 @@ export const closestRateForTimestamp = (
   }
   return bestRate
 }
-
-/**
- * Fetches exchange rates for a specific fiat currency on demand.
- * This is used when the user wants to view rates in a currency other than their default.
- */
-export function fetchExchangeRatesForFiat(
-  fiatCurrencyCode: string
-): ThunkAction<Promise<void>> {
-  return async (dispatch, getState) => {
-    const state = getState()
-    const { account } = state.core
-    const { currencyWallets } = account
-    const now = Date.now()
-    const yesterday = getYesterdayDateRoundDownHour(now).toISOString()
-
-    // Build asset pairs for the requested fiat currency
-    const assetPairs: AssetPair[] = []
-    const pairExpiration = now + ONE_MONTH
-    const rateExpiration = now + ONE_DAY
-
-    // If the fiat isn't dollars, get its price relative to USD
-    if (fiatCurrencyCode !== 'iso:USD') {
-      assetPairs.push({
-        currency_pair: `iso:USD_${fiatCurrencyCode}`,
-        date: undefined,
-        expiration: pairExpiration
-      })
-    }
-
-    // Get rates for all wallet assets
-    for (const walletId of Object.keys(currencyWallets)) {
-      const wallet = currencyWallets[walletId]
-      const { currencyCode } = wallet.currencyInfo
-
-      // Get the primary asset's prices for today
-      assetPairs.push({
-        currency_pair: `${currencyCode}_${fiatCurrencyCode}`,
-        date: undefined,
-        expiration: pairExpiration
-      })
-
-      // Do the same for any tokens
-      for (const tokenId of wallet.enabledTokenIds) {
-        const token = wallet.currencyConfig.allTokens[tokenId]
-        if (token == null) continue
-        if (token.currencyCode === currencyCode) continue
-        assetPairs.push({
-          currency_pair: `${token.currencyCode}_${fiatCurrencyCode}`,
-          date: undefined,
-          expiration: pairExpiration
-        })
-      }
-    }
-
-    // Fetch rates from server in batches
-    const newRates: ExchangeRateCache = {}
-    for (let i = 0; i < assetPairs.length; i += RATES_SERVER_MAX_QUERY_SIZE) {
-      const query = assetPairs.slice(i, i + RATES_SERVER_MAX_QUERY_SIZE)
-
-      const options = {
-        method: 'POST',
-        headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({ data: query })
-      }
-
-      try {
-        const response = await fetchRates('v2/exchangeRates', options)
-        if (response.ok) {
-          const json = await response.json()
-          const cleanedRates = asRatesResponse(json)
-          for (const rate of cleanedRates.data) {
-            const { currency_pair: currencyPair, exchangeRate, date } = rate
-            const isHistorical = now - new Date(date).valueOf() > HOUR_MS
-            const key = isHistorical ? `${currencyPair}_${date}` : currencyPair
-
-            if (exchangeRate != null) {
-              newRates[key] = {
-                expiration: rateExpiration,
-                rate: parseFloat(exchangeRate)
-              }
-            }
-          }
-        }
-      } catch (error: unknown) {
-        console.log(
-          `fetchExchangeRatesForFiat error querying rates server ${String(
-            error
-          )}`
-        )
-      }
-    }
-
-    // Merge with existing rates
-    const mergedRates = { ...exchangeRateCache?.rates, ...newRates }
-    const { exchangeRates, exchangeRatesMap } = buildGuiRates(
-      mergedRates,
-      yesterday
-    )
-
-    // Update Redux state
-    dispatch({
-      type: 'EXCHANGE_RATES/UPDATE_EXCHANGE_RATES',
-      data: {
-        exchangeRates,
-        exchangeRatesMap
-      }
-    })
-
-    // Update the in-memory cache if it exists
-    if (exchangeRateCache != null) {
-      exchangeRateCache.rates = mergedRates
-    }
-  }
-}