Fix: Cache value encoding

- Using BigInt (uInt64) for cache value (balance, sent, received) as they are large for uInt32
- Reflect the changes for BigInt (uInt64) in decode cache value
- Removed default values in cache encoding, as if a value is invalid then it must throw error and not write db

lib/services/address/encoding.js

@@ -127,35 +127,35 @@ Encoding.prototype.encodeAddressCacheValue = function(lastTx, balance, received,
   
   var buffer = [];
 
-  var balanceBuffer = new Buffer(4);
-  balanceBuffer.writeUInt32BE(balance || 0);
+  var balanceBuffer = new Buffer(8);
+  balanceBuffer.writeBigUInt64BE(BigInt(balance));
   buffer.push(balanceBuffer);
 
-  var receivedBuffer = new Buffer(4);
-  receivedBuffer.writeUInt32BE(received || 0);
+  var receivedBuffer = new Buffer(8);
+  receivedBuffer.writeBigUInt64BE(BigInt(received));
   buffer.push(receivedBuffer);
 
-  var sentBuffer = new Buffer(4);
-  sentBuffer.writeUInt32BE(sent || 0);
+  var sentBuffer = new Buffer(8);
+  sentBuffer.writeBigUInt64BE(BigInt(sent));
   buffer.push(sentBuffer);
 
   var txApperancesBuffer = new Buffer(4);
-  txApperancesBuffer.writeUInt32BE(txApperances || 0);
+  txApperancesBuffer.writeUInt32BE(txApperances);
   buffer.push(txApperancesBuffer);
 
-  var txidBuffer = new Buffer(lastTx || Array(65).join('0'), 'hex');
+  var txidBuffer = new Buffer(lastTx);
   buffer.push(txidBuffer);
 
-  return Buffer.concat(buffers); 
+  return Buffer.concat(buffer); 
 }
 
 Encoding.prototype.decodeAddressCacheValue = function(buffer) {
-  
-  var balance = buffer.readUInt32BE(0);
-  var received = buffer.readUInt32BE(4);
-  var sent = buffer.readUInt32BE(8);
-  var txApperances = buffer.readUInt32BE(12);
-  var lastTx = buffer.slice(24).toString('hex');
+
+  var balance = parseInt(buffer.readBigUInt64BE(0));
+  var received = parseInt(buffer.readBigUInt64BE(8));
+  var sent = parseInt(buffer.readBigUInt64BE(16));
+  var txApperances = buffer.readUInt32BE(24);
+  var lastTx = buffer.slice(28).toString('hex');
 
   return { lastTx, balance, received, sent, txApperances };
 }