From 80ae5801add4bea1772923dd4198806f8294647d Mon Sep 17 00:00:00 2001
From: Andrew Glen-Young <aglenyoung@gmail.com>
Date: Thu, 25 May 2017 12:55:53 -0400
Subject: [PATCH] Improve EC2 describe instances performance

Query the EC2 API for the instance ID rather than filter the results of
all instances.
---
 builtin/credential/aws/path_login.go | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/builtin/credential/aws/path_login.go b/builtin/credential/aws/path_login.go
index bf50898405c3..caffd320f322 100644
--- a/builtin/credential/aws/path_login.go
+++ b/builtin/credential/aws/path_login.go
@@ -170,13 +170,8 @@ func (b *backend) validateInstance(s logical.Storage, instanceID, region, accoun
 	}
 
 	status, err := ec2Client.DescribeInstances(&ec2.DescribeInstancesInput{
-		Filters: []*ec2.Filter{
-			&ec2.Filter{
-				Name: aws.String("instance-id"),
-				Values: []*string{
-					aws.String(instanceID),
-				},
-			},
+		InstanceIds: []*string{
+			aws.String(instanceID),
 		},
 	})
 	if err != nil {