33 lines
794 B
JavaScript
33 lines
794 B
JavaScript
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const cache = new Map();
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const expiresIn = 30000; // in milliseconds
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async function getPrice(fiat) {
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fiat ??= 'USD';
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if (cache.has(fiat)) {
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const { price, createdAt } = cache.get(fiat)
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const expired = createdAt + expiresIn < Date.now()
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if (!expired) {
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return price;
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}
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}
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const url = `https://api.coinbase.com/v2/prices/BTC-${fiat}/spot`;
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const price = await fetch(url)
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.then((res) => res.json())
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.then((body) => parseFloat(body.data.amount))
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.catch((err) => {
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console.error(err);
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return -1;
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});
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cache.set(fiat, { price, createdAt: Date.now() });
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return price;
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}
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export default {
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Query: {
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price: async (parent, { fiatCurrency }, ctx) => {
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const price = await getPrice(fiatCurrency);
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return price;
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},
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},
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};
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