framer: add tx, block, and merkleblock packet sending to the framer.

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

lib/bcoin/protocol/framer.js

@@ -248,3 +248,65 @@ Framer.tx = function tx(tx) {
 
   return p;
 };
+
+Framer.prototype.tx = function tx(tx) {
+  return this.packet('tx', Framer.tx(tx));
+};
+
+Framer.block = function _block(block, type) {
+  var p = [];
+  var off = 0;
+
+  off += writeU32(p, constants.version, off);
+
+  // prev_block
+  util.toArray(block.prevBlock, 'hex').forEach(function(ch) {
+    p[off++] = ch;
+  });
+
+  // merkle_root
+  util.toArray(block.merkleRoot, 'hex').forEach(function(ch) {
+    p[off++] = ch;
+  });
+
+  // timestamp
+  off += writeU32(p, block.ts, off);
+
+  // bits
+  off += writeU32(p, block.bits, off);
+
+  // nonce
+  off += writeU32(p, block.nonce, off);
+
+  // txn_count
+  off += varint(p, block.totalTX, off);
+
+  if (type === 'merkleblock') {
+    // hash count
+    off += varint(p, block.hashes.length, off);
+    // hashes
+    block.hashes.forEach(function(hash) {
+      utils.toArray(hash, 'hex').forEach(function(ch) {
+        p[off++] = ch;
+      });
+    });
+    // flag count
+    off += varint(p, block.flags.length, off);
+    // flags
+    block.flags.forEach(function(flag) {
+      p[off++] = flag;
+    });
+  }
+
+  return p;
+};
+
+Framer.prototype.block = function _block(block) {
+  return this.packet(Framer.block(block, 'block'));
+};
+
+Framer.prototype.merkleBlock = function merkleBlock(block) {
+  // XXX Technically we're also supposed to send `tx` packets accompanying the
+  // merkleblock here if we have them, as per the offical bitcoin client.
+  return this.packet(Framer.block(block, 'merkleblock'));
+};