derive addresses in series

lib/server.js

@@ -1063,7 +1063,7 @@ WalletService.prototype.scan = function(opts, cb) {
   var allAddresses = [];
 
   function deriveAddresses(size, derivator, cb) {
-    async.map(_.range(size), function(i, next) {
+    async.mapSeries(_.range(size), function(i, next) {
       setTimeout(function() {
         next(null, derivator());
       }, WalletService.scanConfig.DERIVATION_DELAY)
@@ -1109,7 +1109,7 @@ WalletService.prototype.scan = function(opts, cb) {
         }
       });
 
-      async.each(derivators, function(derivator, next) {
+      async.eachSeries(derivators, function(derivator, next) {
         scanBranch(derivator, next);
       }, function(err) {
         if (err) return cb(err);

test/integration/server.js

@@ -2483,6 +2483,7 @@ describe('Wallet service', function() {
   describe('#scan', function() {
     var scanConfigOld = WalletService.scanConfig;
     beforeEach(function() {
+      this.timeout(5000);
       WalletService.scanConfig.SCAN_WINDOW = 2;
       WalletService.scanConfig.DERIVATION_DELAY = 0;
     });