v12.0.0 - initial commit

packages/server/lib/exchange.js

@@ -0,0 +1,95 @@
+const _ = require('lodash/fp')
+const { ALL_CRYPTOS } = require('@lamassu/coins')
+
+const logger = require('./logger')
+const configManager = require('./new-config-manager')
+const ccxt = require('./plugins/exchange/ccxt')
+const mockExchange = require('./plugins/exchange/mock-exchange')
+const accounts = require('./new-admin/config/accounts')
+
+function lookupExchange(settings, cryptoCode) {
+  const exchange = configManager.getWalletSettings(
+    cryptoCode,
+    settings.config,
+  ).exchange
+  if (exchange === 'no-exchange') return null
+  return exchange
+}
+
+function fetchExchange(settings, cryptoCode) {
+  return Promise.resolve().then(() => {
+    const exchangeName = lookupExchange(settings, cryptoCode)
+    if (exchangeName === 'mock-exchange')
+      return { exchangeName, account: { currencyMarket: 'EUR' } }
+    if (!exchangeName) throw new Error('No exchange set')
+    const account = settings.accounts[exchangeName]
+
+    return { exchangeName, account }
+  })
+}
+
+function buy(settings, tradeEntry) {
+  const { cryptoAtoms, fiatCode, cryptoCode } = tradeEntry
+  return fetchExchange(settings, cryptoCode).then(r => {
+    if (r.exchangeName === 'mock-exchange') {
+      return mockExchange.buy(cryptoAtoms, fiatCode, cryptoCode)
+    }
+    return ccxt.trade('buy', r.account, tradeEntry, r.exchangeName)
+  })
+}
+
+function sell(settings, tradeEntry) {
+  const { cryptoAtoms, fiatCode, cryptoCode } = tradeEntry
+  return fetchExchange(settings, cryptoCode).then(r => {
+    if (r.exchangeName === 'mock-exchange') {
+      return mockExchange.sell(cryptoAtoms, fiatCode, cryptoCode)
+    }
+    return ccxt.trade('sell', r.account, tradeEntry, r.exchangeName)
+  })
+}
+
+function active(settings, cryptoCode) {
+  return !!lookupExchange(settings, cryptoCode)
+}
+
+function getMarkets() {
+  const filterExchanges = _.filter(
+    it => it.class === 'exchange' && !it.dev && it.code !== 'no-exchange',
+  )
+  const availableExchanges = _.map(
+    it => it.code,
+    filterExchanges(accounts.ACCOUNT_LIST),
+  )
+
+  const fetchMarketForExchange = exchange =>
+    ccxt
+      .getMarkets(exchange, ALL_CRYPTOS)
+      .then(markets => ({ exchange, markets }))
+      .catch(error => {
+        logger.error(`Error fetching markets for ${exchange}:`, error)
+        return {
+          exchange,
+          markets: [],
+          error: error.message,
+        }
+      })
+
+  const transformToObject = _.reduce(
+    (acc, { exchange, markets }) => ({
+      ...acc,
+      [exchange]: markets,
+    }),
+    {},
+  )
+
+  const promises = _.map(fetchMarketForExchange, availableExchanges)
+  return Promise.all(promises).then(transformToObject)
+}
+
+module.exports = {
+  fetchExchange,
+  buy,
+  sell,
+  active,
+  getMarkets,
+}