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Add caching

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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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36
src/currencyservice/server.js
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@ -28,26 +28,32 @@ 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) {
request(DATA_URL, (err, res) => { if (!_data) {
if (err) { request(DATA_URL, (err, res) => {
throw new Error(`Error getting data: ${err}`);
}
const body = res.body.split('\n').slice(7, -2).join('\n');
xml2js.parseString(body, (err, resJs) => {
if (err) { if (err) {
throw new Error(`Error parsing HTML: ${err}`); throw new Error(`Error getting data: ${err}`);
} }
const array = resJs['Cube']['Cube'].map(x => x['$']); const body = res.body.split('\n').slice(7, -2).join('\n');
const results = array.reduce((acc, x) => { xml2js.parseString(body, (err, resJs) => {
acc[x['currency']] = x['rate']; if (err) {
return acc; throw new Error(`Error parsing HTML: ${err}`);
}, { 'EUR': '1.0' }); }
callback(results);
const array = resJs['Cube']['Cube'].map(x => x['$']);
const results = array.reduce((acc, x) => {
acc[x['currency']] = x['rate'];
return acc;
}, { 'EUR': '1.0' });
_data = results;
callback(_data);
});
}); });
}); } else {
callback(_data);
}
} }
/** /**