Add requestGatewayBalances() to core

src/core/remote.js

@@ -2280,6 +2280,29 @@ Remote.prototype.requestConnect = function(ip, port, callback) {
   return request;
 };
 
+Remote.prototype.requestGatewayBalances = function(options, callback) {
+  assert(_.isObject(options), 'Options missing');
+  assert(options.account, 'Account missing');
+
+  const request = new Request(this, 'gateway_balances');
+
+  request.message.account = UInt160.json_rewrite(options.account);
+
+  if (!_.isUndefined(options.hotwallet)) {
+    request.message.hotwallet = options.hotwallet;
+  }
+  if (!_.isUndefined(options.strict)) {
+    request.message.strict = options.strict;
+  }
+  if (!_.isUndefined(options.ledger)) {
+    request.selectLedger(options.ledger);
+  }
+
+  request.callback(callback);
+
+  return request;
+};
+
 /**
  * Create a Transaction
  *

test/remote-test.js

@@ -1966,6 +1966,22 @@ describe('Remote', function() {
     });
   });
 
+  it.only('Construct gateway_balances request', function() {
+    const request = remote.requestGatewayBalances({
+      account: 'rGr9PjmVe7MqEXTSbd3njhgJc2s5vpHV54',
+      hotwallet: 'rwxBjBC9fPzyQ9GgPZw6YYLNeRTSx5',
+      strict: true
+    });
+
+    assert.deepEqual(request.message, {
+      command: 'gateway_balances',
+      id: undefined,
+      account: 'rGr9PjmVe7MqEXTSbd3njhgJc2s5vpHV54',
+      hotwallet: 'rwxBjBC9fPzyQ9GgPZw6YYLNeRTSx5',
+      strict: true
+    });
+  });
+
   it('Construct Payment transaction', function() {
     const tx = remote.createTransaction('Payment', {
       account: TX_JSON.Account,