add getActivity(addresses) to blockchain explorer

lib/blockchainexplorer.js

@@ -29,6 +29,7 @@ function BlockChainExplorer(opts) {
       }
       var explorer = new Explorers.Insight(url, network);
       explorer.getTransactions = _.bind(getTransactionsInsight, explorer, url);
+      explorer.getActivity = _.bind(getActivityInsight, explorer, url);
       explorer.initSocket = _.bind(initSocketInsight, explorer, url);
       return explorer;
     default:
@@ -36,10 +37,16 @@ function BlockChainExplorer(opts) {
   };
 };
 
-function getTransactionsInsight(url, addresses, cb) {
+function getTransactionsInsight(url, addresses, from, to, cb) {
+  var qs = [];
+  if (_.isNumber(from)) qs.push('from=' + from);
+  if (_.isNumber(to)) qs.push('to=' + to);
+
+  var url = url + '/api/addrs/txs' + (qs.length > 0 ? '?' + qs.join('&') : '');
+
   request({
     method: "POST",
-    url: url + '/api/addrs/txs',
+    url: url,
     json: {
       addrs: [].concat(addresses).join(',')
     }
@@ -49,6 +56,13 @@ function getTransactionsInsight(url, addresses, cb) {
   });
 };
 
+function getActivityInsight(url, addresses, cb) {
+  getTransactionsInsight(url, addresses, 0, 0, function(err, result) {
+    if (err) return cb(err);
+    return cb(null, result.items > 0);
+  });
+};
+
 function initSocketInsight(url) {
   var socket = io.connect(url, {});
   return socket;

lib/server.js

@@ -1024,7 +1024,7 @@ WalletService.prototype.getTxHistory = function(opts, cb) {
         });
       },
       function(next) {
-        bc.getTransactions(addressStrs, function(err, txs) {
+        bc.getTransactions(addressStrs, null, null, function(err, txs) {
           if (err) return next(err);
 
           next(null, self._normalizeTxHistory(txs));

test/blockchainexplorer.js

@@ -16,6 +16,7 @@ describe('Blockchain explorer', function() {
       should.exist(exp);
       exp.should.respondTo('broadcast');
       exp.should.respondTo('getTransactions');
+      exp.should.respondTo('getActivity');
       exp.should.respondTo('getUnspentUtxos');
       exp.should.respondTo('initSocket');
       var exp = BlockchainExplorer({

test/integration/server.js

@@ -166,7 +166,7 @@ helpers.stubBroadcastFail = function() {
 };
 
 helpers.stubHistory = function(txs) {
-  blockchainExplorer.getTransactions = sinon.stub().callsArgWith(1, null, txs);
+  blockchainExplorer.getTransactions = sinon.stub().callsArgWith(3, null, txs);
 };
 
 helpers.clientSign = WalletUtils.signTxp;