Add everything back for trading

lib/trader.js

@@ -79,6 +79,16 @@ Trader.prototype._consolidateTrades = function () {
   return tradeRec;
 };
 
+Trader.prototype._purchase = function (trade) {
+  var self = this;
+  self.rate(trade.currency, function (err, rate) {
+    self.tradeExchange.purchase(trade.satoshis, rate, function (err) {
+      // XXX: don't ignore purchase errors
+      self.pollBalance();
+    });
+  });
+};
+
 Trader.prototype.configure = function (config) {
   if (config.exchanges.settings.lowBalanceMargin < 1) {
     throw new Error('`settings.lowBalanceMargin` has to be >= 1');
@@ -201,12 +211,46 @@ Trader.prototype.trade = function (fiat, satoshis, currency, callback) {
   callback(null);
 };
 
+Trader.prototype.executeTrades = function () {
+  if (!this.tradeExchange) return;
+
+  this.logger.info('checking for trades');
+
+  var trade = this._consolidateTrades();
+  this.logger.info('consolidated: ', JSON.stringify(trade));
+
+  if (trade.fiat === 0) {
+    this.logger.info('rejecting 0 trade');
+    return;
+  }
+
+  if (trade.fiat < this.config.exchanges.settings.minimumTradeFiat) {
+    // throw it back in the water
+    this.logger.info('reject fiat too small');
+    this._tradeQueue.unshift(trade);
+    return;
+  }
+
+  this.logger.info('making a trade: %d', trade.satoshis / Math.pow(10, 8));
+  this._purchase(trade);
+};
+
 Trader.prototype.startPolling = function () {
   this.pollBalance();
   this.pollRate();
+  this.executeTrades();
 
   this.balanceInterval = setInterval(this.pollBalance.bind(this), 60 * 1000);
   this.rateInterval = setInterval(this.pollRate.bind(this), 60 * 1000);
+
+  // Always start trading, even if we don't have a trade exchange configured,
+  // since configuration can always change in `Trader#configure`.
+  // `Trader#executeTrades` returns early if we don't have a trade exchange
+  // configured at the moment.
+  this.tradeInterval = setInterval(
+    this.executeTrades.bind(this),
+    this.config.exchanges.settings.tradeInterval
+  );
 };
 
 Trader.prototype.stopPolling = function () {