block: add block subtype - block or merkleblock.

Signed-off-by: Fedor Indutny <fedor@indutny.com>

lib/bcoin/block.js

@@ -1,11 +1,12 @@
 var bcoin = require('../bcoin');
 var utils = bcoin.utils;
 
-function Block(data) {
+function Block(data, subtype) {
   if (!(this instanceof Block))
-    return new Block(data);
+    return new Block(data, subtype);
 
   this.type = 'block';
+  this.subtype = subtype;
   this.version = data.version;
   this.prevBlock = utils.toHex(data.prevBlock);
   this.merkleRoot = utils.toHex(data.merkleRoot);

lib/bcoin/chain.js

@@ -449,7 +449,7 @@ Chain.prototype.fromJSON = function fromJSON(json) {
     this.index.bloom = new bcoin.bloom(28 * 1024 * 1024, 16, 0xdeadbee0);
 
   if (this.index.hashes.length === 0)
-    this.add(new bcoin.block(constants.genesis));
+    this.add(new bcoin.block(constants.genesis, 'block'));
 
   for (var i = 0; i < this.index.hashes.length; i++) {
     this.index.bloom.add(this.index.hashes[i], 'hex');

lib/bcoin/peer.js

@@ -278,7 +278,7 @@ Peer.prototype._onPacket = function onPacket(packet) {
     return this._handlePong(payload);
 
   if (cmd === 'merkleblock' || cmd === 'block') {
-    payload = bcoin.block(payload);
+    payload = bcoin.block(payload, cmd);
     this.lastBlock = payload;
   } else if (cmd === 'tx') {
     payload = bcoin.tx(payload, this.lastBlock);

test/block-test.js

@@ -25,7 +25,7 @@ describe('Block', function() {
         '1f5e46b9da3a8b1241f4a1501741d3453bafddf6135b600b926e3f4056c6d564',
         '33825657ba32afe269819f01993bd77baba86379043168c94845d32370e53562' ],
       flags: [ 245, 90, 0 ]
-    });
+    }, 'merkleblock');
 
     assert(block.verify());
     assert.equal(block.tx.length, 2);