From 8d930ceed1cb5eefec9a1091c5b22d01f9f2af1b Mon Sep 17 00:00:00 2001
From: "Owain G. Ainsworth" <oga@conformal.com>
Date: Wed, 29 Jan 2014 01:09:42 +0000
Subject: [PATCH] convert getdifficulty to getBlockHeaderBySha to save some
 cycles.

---
 rpcserver.go | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/rpcserver.go b/rpcserver.go
index 2c4d7d9db..60b39dffa 100644
--- a/rpcserver.go
+++ b/rpcserver.go
@@ -930,13 +930,11 @@ func handleGetDifficulty(s *rpcServer, cmd btcjson.Cmd) (interface{}, error) {
 		rpcsLog.Errorf("Error getting sha: %v", err)
 		return nil, btcjson.ErrDifficulty
 	}
-	blk, err := s.server.db.FetchBlockBySha(sha)
+	blockHeader, err := s.server.db.FetchBlockHeaderBySha(sha)
 	if err != nil {
 		rpcsLog.Errorf("Error getting block: %v", err)
 		return nil, btcjson.ErrDifficulty
 	}
-	blockHeader := &blk.MsgBlock().Header
-
 	return getDifficultyRatio(blockHeader.Bits), nil
 }