scan addresses 1 by 1 and rewind to last used one

lib/blockchainexplorers/insight.js

@@ -112,10 +112,20 @@ Insight.prototype.getTransactions = function(addresses, from, to, cb) {
   });
 };
 
-Insight.prototype.getAddressActivity = function(addresses, cb) {
-  this.getTransactions(addresses, null, null, function(err, result) {
-    if (err) return cb(err);
-    return cb(null, result && result.length > 0);
+Insight.prototype.getAddressActivity = function(address, cb) {
+  var url = this.url + this.apiPrefix + '/addr/' + address;
+  var args = {
+    method: 'GET',
+    url: url,
+  };
+
+  request(args, function(err, res, result) {
+    if (res && res.statusCode == 404) return cb();
+    if (err || res.statusCode !== 200)
+      return cb(_parseErr(err, res));
+
+    var nbTxs = result.unconfirmedTxApperances + result.txApperances;
+    return cb(null, nbTxs > 0);
   });
 };
 

lib/server.js

@@ -64,7 +64,7 @@ WalletService.BACKOFF_TIME = 2;
 
 // Fund scanning parameters
 WalletService.SCAN_CONFIG = {
-  scanWindow: 20,
+  maxGap: 20,
   derivationDelay: 10, // in milliseconds
 };
 
@@ -1878,43 +1878,35 @@ WalletService.prototype.scan = function(opts, cb) {
 
   opts = opts || {};
 
-  function deriveAddresses(size, derivator, cb) {
-    async.mapSeries(_.range(size), function(i, next) {
-      setTimeout(function() {
-        next(null, derivator.derive());
-      }, WalletService.SCAN_CONFIG.derivationDelay)
-    }, cb);
-  };
-
-  function checkActivity(addresses, networkName, cb) {
-    var bc = self._getBlockchainExplorer(networkName);
-    bc.getAddressActivity(addresses, cb);
+  function checkActivity(address, network, cb) {
+    var bc = self._getBlockchainExplorer(network);
+    bc.getAddressActivity(address, cb);
   };
 
   function scanBranch(derivator, cb) {
-    var activity = true;
+    var inactiveCounter = 0;
     var allAddresses = [];
-    var networkName;
+    var gap = WalletService.SCAN_CONFIG.maxGap;
+
     async.whilst(function() {
-      return activity;
+      return inactiveCounter < gap;
     }, function(next) {
-      deriveAddresses(WalletService.SCAN_CONFIG.scanWindow, derivator, function(err, addresses) {
-        if (err) return next(err);
-        networkName = networkName || Bitcore.Address(addresses[0].address).toObject().network;
-        checkActivity(_.pluck(addresses, 'address'), networkName, function(err, thereIsActivity) {
+      var address = derivator.derive();
+      checkActivity(address.address, address.network, function(err, activity) {
+        console.log('*** [server.js ln1895] address.path, activity:', address.path, activity); // TODO
+
         if (err) return next(err);
 
-          activity = thereIsActivity;
-          if (thereIsActivity) {
-            allAddresses.push(addresses);
-          } else {
-            derivator.rewind(WalletService.SCAN_CONFIG.scanWindow);
-          }
+        allAddresses.push(address);
+        inactiveCounter = activity ? 0 : inactiveCounter + 1;
+
+        console.log('*** [server.js ln1905] inactiveCounter:', inactiveCounter); // TODO
+
         next();
       });
-      });
     }, function(err) {
-      return cb(err, _.flatten(allAddresses));
+      derivator.rewind(gap);
+      return cb(err, _.dropRight(allAddresses, gap));
     });
   };
 

test/integration/server.js

@@ -237,8 +237,8 @@ helpers.stubFeeLevels = function(levels) {
 };
 
 helpers.stubAddressActivity = function(activeAddresses) {
-  blockchainExplorer.getAddressActivity = function(addresses, cb) {
-    return cb(null, _.intersection(activeAddresses, addresses).length > 0);
+  blockchainExplorer.getAddressActivity = function(address, cb) {
+    return cb(null, _.contains(activeAddresses, address));
   };
 };
 
@@ -4771,7 +4771,7 @@ describe('Wallet service', function() {
     describe('1-of-1 wallet (BIP44 & P2PKH)', function() {
       beforeEach(function(done) {
         this.timeout(5000);
-        WalletService.SCAN_CONFIG.scanWindow = 2;
+        WalletService.SCAN_CONFIG.maxGap = 2;
         WalletService.SCAN_CONFIG.derivationDelay = 0;
 
         helpers.createAndJoinWallet(1, 1, function(s, w) {
@@ -4784,7 +4784,7 @@ describe('Wallet service', function() {
         WalletService.SCAN_CONFIG = scanConfigOld;
       });
 
-      it('should scan main addresses', function(done) {
+      it.only('should scan main addresses', function(done) {
         helpers.stubAddressActivity(
           ['1L3z9LPd861FWQhf3vDn89Fnc9dkdBo2CG', // m/0/0
             '1GdXraZ1gtoVAvBh49D4hK9xLm6SKgesoE', // m/0/2
@@ -4794,9 +4794,7 @@ describe('Wallet service', function() {
           'm/0/0',
           'm/0/1',
           'm/0/2',
-          'm/0/3',
           'm/1/0',
-          'm/1/1',
         ];
         server.scan({}, function(err) {
           should.not.exist(err);
@@ -4810,7 +4808,7 @@ describe('Wallet service', function() {
               _.difference(paths, expectedPaths).length.should.equal(0);
               server.createAddress({}, function(err, address) {
                 should.not.exist(err);
-                address.path.should.equal('m/0/4');
+                address.path.should.equal('m/0/3');
                 done();
               });
             });