handle the PeerID-already-in-use error and display a friendly message

index.html

@@ -162,10 +162,14 @@
     <!-- Templates -->
     <script type="text/ng-template" id="signin.html">
       <div class="signin" ng-controller="SigninController">
-        <div data-alert class="alert-box info radius" ng-show="loading">
+        <div data-alert class="alert-box info radius" ng-show="loading && !failure">
           <i class="size-21 fi-bitcoin-circle icon-rotate spinner"></i>
           Authenticating and Looking for peers...
         </div>
+        <div class="alert-box error radius" ng-show="failure">
+          Oops, we had an error! Looks like you are already connected to this wallet,
+          please close all other Copay Wallets and <a ng-click='failure = false; loading = false'>Try again</a>.
+        </div>
         <div ng-show="!loading">
           <div class="row">
             <div class="large-6 medium-6 columns">

js/controllers/signin.js

@@ -7,7 +7,7 @@ angular.module('copay.signin').controller('SigninController',
       return v1 > v2 ? 1 : ( v1 < v2 ) ? -1 : 0;
     };
 
-    $scope.loading = false;
+    $scope.loading = $scope.failure = false;
     $scope.wallets = walletFactory.getWallets().sort(cmp);
     $scope.selectedWalletId = $scope.wallets.length ? $scope.wallets[0].id : null;
     $scope.openPassword = '';
@@ -34,12 +34,13 @@ angular.module('copay.signin').controller('SigninController',
       Passphrase.getBase64Async(password, function(passphrase){
         var w = walletFactory.open($scope.selectedWalletId, { passphrase: passphrase});
         if (!w) {
-          $scope.loading = false;
+          $scope.loading = $scope.failure = false;
           $rootScope.flashMessage = { message: 'Bad password or connection error', type: 'error'};
           $rootScope.$digest();
           return;
         }
         controllerUtils.startNetwork(w);
+        listenErrors(w);
       });
     };
 
@@ -66,8 +67,16 @@ angular.module('copay.signin').controller('SigninController',
               controllerUtils.onErrorDigest();
           } else {
               controllerUtils.startNetwork(w);
+              listenErrors(w);
           }
         });
       });
     };
+
+    function listenErrors(wallet) {
+      wallet.network.on('error', function(err) {
+        $scope.failure = true;
+      });
+    }
+
   });

js/models/network/WebRTC.js

@@ -262,6 +262,7 @@ Network.prototype._setupPeerHandlers = function(openCallback) {
   p.on('error', function(err) {
     if (!err.message.match(/Could\snot\sconnect\sto peer/)) {
       console.log('### PEER ERROR:', err);
+      self.emit('error', err);
     }
     self._checkAnyPeer();
   });