blob: 1f20dc00548c19c60e0e7a737f8ad97fd3e2bada (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
const ObservableStore = require('obs-store')
const extend = require('xtend')
// every ten minutes
const POLLING_INTERVAL = 600000
class CurrencyController {
constructor (opts = {}) {
const initState = extend({
currentCurrency: 'USD',
conversionRate: 0,
conversionDate: 'N/A',
}, opts.initState)
this.store = new ObservableStore(initState)
}
//
// PUBLIC METHODS
//
getCurrentCurrency () {
return this.store.getState().currentCurrency
}
setCurrentCurrency (currentCurrency) {
this.store.updateState({ currentCurrency })
}
getConversionRate () {
return this.store.getState().conversionRate
}
setConversionRate (conversionRate) {
this.store.updateState({ conversionRate })
}
getConversionDate () {
return this.store.getState().conversionDate
}
setConversionDate (conversionDate) {
this.store.updateState({ conversionDate })
}
updateConversionRate () {
const currentCurrency = this.getCurrentCurrency()
return fetch(`https://api.cryptonator.com/api/ticker/eth-${currentCurrency}`)
.then(response => response.json())
.then((parsedResponse) => {
this.setConversionRate(Number(parsedResponse.ticker.price))
this.setConversionDate(Number(parsedResponse.timestamp))
}).catch((err) => {
if (err) {
console.warn('MetaMask - Failed to query currency conversion.')
this.setConversionRate(0)
this.setConversionDate('N/A')
}
})
}
scheduleConversionInterval () {
if (this.conversionInterval) {
clearInterval(this.conversionInterval)
}
this.conversionInterval = setInterval(() => {
this.updateConversionRate()
}, POLLING_INTERVAL)
}
}
module.exports = CurrencyController
|
