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Add util for fetching bitcoin exchange rate

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This commit is contained in:
Basti
2020-09-30 12:10:21 +02:00
parent 7288d75237
commit b5700092a8
4 changed files with 127 additions and 0 deletions
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app/utils/fetch-exchange-rate.js
+20
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@@ -0,0 +1,20 @@
const bitstampBaseUrl = 'https://www.bitstamp.net/api/v2';
async function fetchFromBitstamp(currencyPair) {
try {
const res = await fetch(`${bitstampBaseUrl}/ticker/${currencyPair}/`).then(r => r.json());
return res.vwap; // Last 24 hours volume weighted average price
} catch(e) {
console.error('Could not fetch exchange rate from Bitstamp:', e);
return 0;
}
}
export default function fetchExchangeRate(currencyPair, source='bitstamp') {
if (!currencyPair) throw 'Currency pair required';
switch(source) {
case 'bitstamp':
return fetchFromBitstamp(currencyPair);
}
}
package-lock.json
Generated
+75
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@@ -16191,6 +16191,63 @@
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@@ -16930,6 +16987,12 @@
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@@ -18352,6 +18415,12 @@
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@@ -19495,6 +19564,12 @@
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package.json
+1
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@@ -67,6 +67,7 @@
"eslint-plugin-ember": "^8.5.2",
"eslint-plugin-node": "^11.1.0",
"ethers": "^4.0.47",
"fetch-mock": "^9.10.7",
"kredits-contracts": "github:67P/kredits-contracts#feature/expenses",
"loader.js": "^4.7.0",
"localforage": "^1.7.3",
tests/unit/utils/fetch-exchange-rate-test.js
+31
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@@ -0,0 +1,31 @@
import fetchExchangeRate from 'kredits-web/utils/fetch-exchange-rate';
import { module, test } from 'qunit';
import fetchMock from 'fetch-mock';
fetchMock.get('https://www.bitstamp.net/api/v2/ticker/btceur/', {
"high": "9258.43", "last": "9165.14", "timestamp": "1601455909", "bid":
"9159.93", "vwap": "9167.57", "volume": "1542.54764854", "low": "9080.20",
"ask": "9165.14", "open": "9240.84"
});
fetchMock.get('https://www.bitstamp.net/api/v2/ticker/btcusd/', {
"high": "10865.00", "last": "10714.62", "timestamp": "1601455914", "bid":
"10711.31", "vwap": "10749.70", "volume": "4460.32091975", "low": "10636.66",
"ask": "10715.99", "open": "10840.00"
});
module('Unit | Utility | fetch-exchange-rate', function() {
test('it requires a currency pair', function(assert) {
assert.throws(fetchExchangeRate);
});
test('it fetches BTCEUR from Bitstamp', async function(assert) {
let result = await fetchExchangeRate('btceur');
assert.equal(result, 9167.57, 'returns 24-hour volume-weighted average price');
});
test('it fetches BTCUSD from Bitstamp', async function(assert) {
let result = await fetchExchangeRate('btcusd');
assert.equal(result, 10749.70, 'returns 24-hour volume-weighted average price');
});
});