migrate current plugins to ccxt

lib/plugins/common/cctx.js

@@ -0,0 +1,28 @@
+const _ = require('lodash/fp')
+
+const CRYPTO = {
+  bitstamp: ['BTC', 'ETH', 'LTC', 'BCH'],
+  itbit: ['BTC', 'ETH', 'LTC', 'BCH'],
+  kraken: ['BTC', 'ETH', 'LTC', 'DASH', 'ZEC', 'BCH'],
+  coinbase: ['BTC', 'ETH', 'LTC', 'BCH', 'ZEC', 'DASH']
+}
+
+const FIAT = {
+  bitstamp: ['USD', 'EUR'],
+  itbit: ['USD'],
+  kraken: ['USD', 'EUR']
+}
+
+module.exports = { verifyCurrencies }
+
+function verifyCurrencies (exchangeName, fiatCode, cryptoCode) {
+  if (!_.includes(cryptoCode, CRYPTO[exchangeName])) {
+    throw new Error('Unsupported crypto: ' + cryptoCode)
+  }
+  if (!(exchangeName === 'coinbase')) { // coinbase is only used for ticker and it's expected to support most of the fiat
+    if (!_.includes(fiatCode, FIAT[exchangeName])) {
+      throw new Error('Unsupported fiat: ' + fiatCode)
+    }
+  }
+  return cryptoCode + '/' + fiatCode
+}

lib/plugins/exchange/cctx/cctx.js

@@ -0,0 +1,57 @@
+var ccxt = require('ccxt')
+const coinUtils = require('../../../coin-utils')
+const _ = require('lodash/fp')
+const common = require('../../common/cctx')
+
+function trade (side, account, cryptoAtoms, fiatCode, cryptoCode, exchangeName) {
+  try {
+    const exchange = setUpExchange(account, exchangeName)
+    const symbol = common.verifyCurrencies(exchangeName, fiatCode, cryptoCode)
+    const amount = coinUtils.toUnit(cryptoAtoms, cryptoCode).toFixed(8)
+    if (exchangeName === 'itbit') {
+      return exchange.fetchOrderBook(symbol)
+        .then(orderBook => {
+          return exchange.createOrder(symbol, 'limit', side, amount, calculatePrice(side, amount, orderBook), { walletId: account.walletId })
+        })
+    }
+    return exchange.createOrder(symbol, 'market', side, amount)
+  } catch (e) {
+    return Promise.reject(e)
+  }
+}
+
+function setUpExchange (account, exchangeName) {
+  // map given credentials to cctx properties
+  if (!_.includes(exchangeName, ccxt.exchanges)) {
+    throw new Error(`Exchange ${exchangeName} not supported by ccxt.`)
+  }
+
+  switch (exchangeName) {
+    case 'itbit':
+      if (!account.clientKey || !account.clientSecret || !account.userId || !account.walletId)
+        throw new Error('Must provide user ID, wallet ID, client key, and client secret')
+      return new ccxt[exchangeName](_.mapKeys((key) => { return key === 'clientKey' ? 'apiKey' : key === 'clientSecret' ? 'secret' : key === 'userId' ? 'uid' : key }, _.omit(['walletId'], account)))
+    case 'kraken':
+      if (!account.apiKey || !account.privateKey)
+        throw new Error('Must provide key and private key')
+      return new ccxt[exchangeName](_.mapKeys((key) => { return key === 'privateKey' ? 'secret' : key }, account))
+    case 'bitstamp':
+      if (!account.key || !account.secret || !account.clientId)
+        throw new Error('Must provide key, secret and client ID')
+      return new ccxt[exchangeName](_.mapKeys((key) => { return key === 'key' ? 'apiKey' : key === 'clientId' ? 'uid' : key }, account))
+    default:
+      throw new Error(`Exchange ${exchangeName} not supported.`)
+  }
+}
+
+function calculatePrice (side, amount, orderBook) {
+  const book = side === 'buy' ? 'asks' : 'bids'
+  let collected = 0.0
+  for (const entry of orderBook[book]) {
+    collected += parseFloat(entry[1])
+    if (collected >= amount) return parseFloat(entry[0])
+  }
+  throw new Error('Insufficient market depth')
+}
+
+module.exports = { trade }

lib/plugins/ticker/cctx/cctx.js

@@ -0,0 +1,57 @@
+const ccxt = require('ccxt')
+const BN = require('../../../bn')
+const axios = require('axios')
+const _ = require('lodash/fp')
+const common = require('../../common/cctx')
+
+function ticker (exchangeName, fiatCode, cryptoCode) {
+  const exchange = new ccxt[exchangeName]()
+
+  if (fiatCode === 'EUR' || fiatCode === 'USD' || exchange.id === 'coinbase') {
+    return getCurrencyRates(exchange, fiatCode, cryptoCode)
+  }
+
+  return axios.get('https://bitpay.com/rates')
+    .then(response => {
+      try {
+        const fxRates = response.data.data
+        const usdRate = findCurrencyRates(fxRates, 'USD')
+        const fxRate = findCurrencyRates(fxRates, fiatCode).div(usdRate)
+
+        return getCurrencyRates(exchange, 'USD', cryptoCode)
+          .then(res => ({
+            rates: {
+              ask: res.rates.ask.times(fxRate),
+              bid: res.rates.bid.times(fxRate)
+            }
+          }))
+      } catch (e) {
+        return Promise.reject(e)
+      }
+    })
+}
+
+function getCurrencyRates (exchange, fiatCode, cryptoCode) {
+  try {
+    if (exchange.has['fetchTicker']) {
+      const symbol = common.verifyCurrencies(exchange.id, fiatCode, cryptoCode)
+      return exchange.fetchTicker(symbol)
+        .then(res => ({
+          rates: {
+            ask: BN(res.ask),
+            bid: BN(res.bid)
+          }
+        }))
+    }
+  } catch (e) {
+    return Promise.reject(e)
+  }
+}
+
+function findCurrencyRates (fxRates, fiatCode) {
+  const rates = _.find(_.matchesProperty('code', fiatCode), fxRates)
+  if (!rates || !rates.rate) throw new Error(`Unsupported currency: ${fiatCode}`)
+  return BN(rates.rate.toString())
+}
+
+module.exports = { ticker }