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webtask-openexchangerate
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const request = require('request'); | |
const OPEN_EXCHANGE_API_URL = 'https://openexchangerates.org/api'; | |
const OE_LATEST = `${OPEN_EXCHANGE_API_URL}/latest.json`; | |
module.exports = function(ctx, done) { | |
const APP_ID = ctx.data.APP_ID; | |
const url = `${OE_LATEST}?app_id=${APP_ID}`; | |
// Get the data from the storage to prevent unnecessary requests | |
ctx.storage.get((err, data) => { | |
if (err) { | |
return done(err); | |
} | |
const now = Date.now(); | |
const dataTime = (data || {}).time || 0; | |
// If the data is recent enough (less than 1 hour) | |
if (now - dataTime <= 1 * 60 * 60 * 1000) { | |
return done(null, data.body); | |
} | |
// otherwise we fetch the remote api | |
request.get(url, (geterr, resp) => { | |
if (geterr) { | |
return done(geterr); | |
} | |
const body = JSON.parse(resp.body); | |
const dataBody = { | |
timestamp: body.timestamp, | |
base: body.base, | |
rates: body.rates | |
}; | |
ctx.storage.set( | |
{ | |
time: now, | |
body: dataBody | |
}, | |
error => { | |
if (error) { | |
return done(error); | |
} | |
return done(null, dataBody); | |
} | |
); | |
}); | |
}); | |
}; |
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