Database indexing: fix mismatching balances and add db file locks

lib/database.js

@@ -58,12 +58,12 @@ function update_address(hash, txid, amount, type, cb) {
           var tx_array = address.txs;
           var received = address.received;
           var sent = address.sent;
-          if (type == 'vin') {
-            sent = sent + amount;
-          } else {
-            received = received + amount;
-          }
-          if (unique == true) {
+          if ((unique == true) || (type != tx_array[index].type)) {
+            if (type == 'vin') {
+              sent = sent + amount;
+            } else {
+              received = received + amount;
+            }
             tx_array.push({addresses: txid, type: type});
             if ( tx_array.length > settings.txcount ) {
               tx_array.shift();
@@ -77,18 +77,7 @@ function update_address(hash, txid, amount, type, cb) {
               return cb();
             });
           } else {
-            if (type == tx_array[index].type) {
-              return cb(); //duplicate
-            } else {
-              Address.update({a_id:hash}, {
-                txs: tx_array,
-                received: received,
-                sent: sent,
-                balance: received - sent
-              }, function() {
-                return cb();
-              });
-            }
+            return cb(); //duplicate
           }
         });
       }