From bfe7ad7ec30ebf0e9914ed1cf58076ffca51d119 Mon Sep 17 00:00:00 2001
From: Kevin Atkinson <k@kevina.org>
Date: Thu, 3 Nov 2016 23:14:57 -0400
Subject: [PATCH] merkledag: optimize DagService GetLinks for Raw Nodes.

A Raw Node can not possible have links, so there is no need to retrive
the node.

Once Raw Nodes are in common usage this can likely make a big difference
in the GC and other places that just care about the Links.

License: MIT
Signed-off-by: Kevin Atkinson <k@kevina.org>
---
 merkledag/merkledag.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/merkledag/merkledag.go b/merkledag/merkledag.go
index b2a097a5265..222adb55090 100644
--- a/merkledag/merkledag.go
+++ b/merkledag/merkledag.go
@@ -114,6 +114,9 @@ func decodeBlock(b blocks.Block) (node.Node, error) {
 }
 
 func (n *dagService) GetLinks(ctx context.Context, c *cid.Cid) ([]*node.Link, error) {
+	if c.Type() == cid.Raw {
+		return nil, nil
+	}
 	node, err := n.Get(ctx, c)
 	if err != nil {
 		return nil, err