From 68368397d3fce706808ff0e58bc9a3d8aadb4a97 Mon Sep 17 00:00:00 2001
From: Braydon Fuller <braydon@bitpay.com>
Date: Thu, 17 Sep 2015 18:11:47 -0400
Subject: [PATCH] Add binding to get the best block hash.

---
 integration/regtest.js         | 6 ++++++
 lib/services/bitcoind.js       | 4 ++++
 src/libbitcoind.cc             | 8 ++++++++
 src/libbitcoind.h              | 1 +
 test/services/bitcoind.unit.js | 1 +
 5 files changed, 20 insertions(+)

diff --git a/integration/regtest.js b/integration/regtest.js
index dc4fab19..fd7f7e01 100644
--- a/integration/regtest.js
+++ b/integration/regtest.js
@@ -400,9 +400,11 @@ describe('Daemon Binding Functionality', function() {
   });
 
   describe('get transaction output set information', function() {
+    var bestblock;
     it('will get the correct info', function() {
       var info = bitcoind.getTxOutSetInfo();
       info.bestblock.should.be.a('string');
+      bestblock = info.bestblock;
       info.bestblock.length.should.equal(64);
       info.bytes_serialized.should.equal(10431);
       info.hash_serialized.should.be.a('string');
@@ -412,5 +414,9 @@ describe('Daemon Binding Functionality', function() {
       info.transactions.should.equal(151);
       info.txouts.should.equal(151);
     });
+    it('will get the best block hash', function() {
+      var best = bitcoind.getBestBlockHash();
+      best.should.equal(bestblock);
+    });
   });
 });
diff --git a/lib/services/bitcoind.js b/lib/services/bitcoind.js
index becc813f..59cca5b8 100644
--- a/lib/services/bitcoind.js
+++ b/lib/services/bitcoind.js
@@ -223,6 +223,10 @@ Bitcoin.prototype.addMempoolUncheckedTransaction = function(txBuffer) {
   return bindings.addMempoolUncheckedTransaction(txBuffer);
 };
 
+Bitcoin.prototype.getBestBlockHash = function() {
+  return bindings.getBestBlockHash();
+};
+
 Bitcoin.prototype.getTxOutSetInfo = function() {
   return bindings.getTxOutSetInfo();
 };
diff --git a/src/libbitcoind.cc b/src/libbitcoind.cc
index e0dd0103..4905d40f 100644
--- a/src/libbitcoind.cc
+++ b/src/libbitcoind.cc
@@ -229,6 +229,13 @@ NAN_METHOD(GetTxOutSetInfo) {
 
 };
 
+NAN_METHOD(GetBestBlockHash) {
+  {
+    LOCK(cs_main);
+    NanReturnValue(NanNew<String>(chainActive.Tip()->GetBlockHash().GetHex()));
+  }
+}
+
 /**
  * IsSynced()
  * bitcoind.isSynced()
@@ -1702,6 +1709,7 @@ init(Handle<Object> target) {
   NODE_SET_METHOD(target, "syncPercentage", SyncPercentage);
   NODE_SET_METHOD(target, "isSynced", IsSynced);
   NODE_SET_METHOD(target, "getTxOutSetInfo", GetTxOutSetInfo);
+  NODE_SET_METHOD(target, "getBestBlockHash", GetBestBlockHash);
 
 }
 
diff --git a/src/libbitcoind.h b/src/libbitcoind.h
index f4adcfa1..9a960e75 100644
--- a/src/libbitcoind.h
+++ b/src/libbitcoind.h
@@ -37,3 +37,4 @@ NAN_METHOD(StartTxMon);
 NAN_METHOD(SyncPercentage);
 NAN_METHOD(IsSynced);
 NAN_METHOD(GetTxOutSetInfo);
+NAN_METHOD(GetBestBlockHash);
diff --git a/test/services/bitcoind.unit.js b/test/services/bitcoind.unit.js
index 6f152e31..f341caaa 100644
--- a/test/services/bitcoind.unit.js
+++ b/test/services/bitcoind.unit.js
@@ -409,6 +409,7 @@ describe('Bitcoin Service', function() {
       ['getMempoolOutputs', 1],
       ['addMempoolUncheckedTransaction', 1],
       ['getTxOutSetInfo', 0],
+      ['getBestBlockHash', 0],
       ['getInfo', 0]
     ];