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Add caching

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This commit is contained in:
Ace Nassri 2018-06-25 13:16:40 -07:00
parent 7063092393
commit 296841756d
1 changed files with 21 additions and 15 deletions
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8
src/currencyservice/server.js
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@ -28,7 +28,9 @@ const shopProto = grpc.load(PROTO_PATH).hipstershop;
* Helper function that gets currency data from an XML webpage * Helper function that gets currency data from an XML webpage
* Uses public data from European Central Bank * Uses public data from European Central Bank
*/ */
let _data;
function _getCurrencyData (callback) { function _getCurrencyData (callback) {
if (!_data) {
request(DATA_URL, (err, res) => { request(DATA_URL, (err, res) => {
if (err) { if (err) {
throw new Error(`Error getting data: ${err}`); throw new Error(`Error getting data: ${err}`);
@ -45,9 +47,13 @@ function _getCurrencyData (callback) {
acc[x['currency']] = x['rate']; acc[x['currency']] = x['rate'];
return acc; return acc;
}, { 'EUR': '1.0' }); }, { 'EUR': '1.0' });
callback(results); _data = results;
callback(_data);
}); });
}); });
} else {
callback(_data);
}
} }
/** /**