From 242fbd0a597488b643f11d112c22697be43e1894 Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Tue, 9 Aug 2016 21:12:53 -0700
Subject: [PATCH] rpc: optimize getchaintips.

---
 lib/bcoin/http/rpc.js | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/lib/bcoin/http/rpc.js b/lib/bcoin/http/rpc.js
index 6e57f09e..67a45ef5 100644
--- a/lib/bcoin/http/rpc.js
+++ b/lib/bcoin/http/rpc.js
@@ -956,7 +956,7 @@ RPC.prototype.getchaintips = function getchaintips(args, callback) {
       tips.push(self.chain.tip);
 
       utils.forEachSerial(tips, function(entry, next) {
-        self.chain.findFork(entry, self.chain.tip, function(err, fork) {
+        self._findFork(entry, function(err, fork) {
           if (err)
             return next(err);
 
@@ -984,6 +984,20 @@ RPC.prototype.getchaintips = function getchaintips(args, callback) {
   });
 };
 
+RPC.prototype._findFork = function _findFork(entry, callback) {
+  (function next(err, entry) {
+    entry.isMainChain(function(err, main) {
+      if (err)
+        return callback(err);
+
+      if (main)
+        return callback(null, entry);
+
+      entry.getPrevious(next);
+    });
+  })(null, entry);
+};
+
 RPC.prototype.getdifficulty = function getdifficulty(args, callback) {
   if (args.help || args.length !== 0)
     return callback(new RPCError('getdifficulty'));