63 lines
2.2 KiB
JavaScript
63 lines
2.2 KiB
JavaScript
const { utils: coinUtils } = require('@lamassu/coins')
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const _ = require('lodash/fp')
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const mem = require('mem')
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const configManager = require('./new-config-manager')
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const logger = require('./logger')
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const lastRate = {}
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const ccxt = require('./plugins/ticker/ccxt')
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const mockTicker = require('./plugins/ticker/mock-ticker')
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const bitpay = require('./plugins/ticker/bitpay')
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const FETCH_INTERVAL = 58000
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const PEGGED_FIAT_CURRENCIES = { NAD: 'ZAR' }
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const getFallbackTicker = ticker =>
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_.difference(['bitpay', 'kraken', 'bitstamp'], [ticker])[0]
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const hasRatesOrReject = emsg => r => _.get(['rates'], r) ?
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r :
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Promise.reject(new Error(emsg))
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const get1 = (market, fiatCode, cryptoCode, ticker, emsg) =>
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buildTicker(fiatCode, cryptoCode, ticker)
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.then(hasRatesOrReject(emsg))
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.then(({ rates }) => {
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return lastRate[market] = { rates, timestamp: Date.now() }
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})
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const _getRates = (settings, fiatCode, cryptoCode) => Promise.resolve()
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.then(() => {
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const ticker = configManager.getWalletSettings(cryptoCode, settings.config).ticker
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const market = [cryptoCode, fiatCode].join('-')
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const fallbackTicker = getFallbackTicker(ticker)
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const emsg = fallbackTicker ?
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"Failed to get rates with configured ticker, trying fallback" :
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"Failed to get ticker rates"
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return get1(market, fiatCode, cryptoCode, ticker, emsg)
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.catch(err => {
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logger.error(err)
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return fallbackTicker ?
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get1(market, fiatCode, cryptoCode, fallbackTicker, "Failed to get rates with fallback ticker") :
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lastRate[market]
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})
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.then(hasRatesOrReject("Failed to get ticker rates"))
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})
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function buildTicker (fiatCode, cryptoCode, tickerName) {
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fiatCode = _.defaultTo(fiatCode, _.get([fiatCode], PEGGED_FIAT_CURRENCIES))
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cryptoCode = coinUtils.getEquivalentCode(cryptoCode)
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if (tickerName === 'bitpay') return bitpay.ticker(fiatCode, cryptoCode)
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if (tickerName === 'mock-ticker') return mockTicker.ticker(fiatCode, cryptoCode)
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return ccxt.ticker(fiatCode, cryptoCode, tickerName)
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}
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const getRates = mem(_getRates, {
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maxAge: FETCH_INTERVAL,
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cacheKey: (settings, fiatCode, cryptoCode) => JSON.stringify([fiatCode, cryptoCode])
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})
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module.exports = { getRates }
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