| 1 |
|
| 2 | import fetch from 'node-fetch'
|
| 3 | import ECBBackend from './ecb'
|
| 4 | import { fromPairs } from 'lodash'
|
| 5 |
|
| 6 | const COINMARKETCAP_API = 'https://api.coinmarketcap.com/v1/ticker/'
|
| 7 | const ROUNDING_FACTOR = 100000000
|
| 8 |
|
| 9 | export default class ECBAndCoinMarketCapBackend extends ECBBackend {
|
| 10 | async connect () {
|
| 11 | await super.connect()
|
| 12 | const ccRates = await this._getCCRates(this.rates.USD)
|
| 13 | Object.assign(this.rates, ccRates)
|
| 14 | this.currencies = this.currencies.concat(Object.keys(ccRates))
|
| 15 | this.currencies.sort()
|
| 16 | }
|
| 17 |
|
| 18 | private async _getCCRates (usdRate: number) {
|
| 19 | const rateRes = await fetch(COINMARKETCAP_API)
|
| 20 | if (rateRes.status !== 200) {
|
| 21 | throw new Error('Unexpected status from coinmarketcap.com: ' + rateRes.status)
|
| 22 | }
|
| 23 | const body = await rateRes.json()
|
| 24 | return fromPairs(body.map((rateInfo: any) => {
|
| 25 | return [rateInfo.symbol, Math.floor(ROUNDING_FACTOR / (rateInfo.price_usd * usdRate)) / ROUNDING_FACTOR]
|
| 26 | }))
|
| 27 | }
|
| 28 | }
|