From fe7379f102c350962f0918bc499b8f52dfbcff76 Mon Sep 17 00:00:00 2001
From: Gyu-Ho Lee <gyuhox@gmail.com>
Date: Fri, 7 Oct 2016 10:51:01 -0700
Subject: [PATCH] clientv3: add Op.prevKV

---
 clientv3/kv.go | 2 +-
 clientv3/op.go | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/clientv3/kv.go b/clientv3/kv.go
index 93d68e570..584912985 100644
--- a/clientv3/kv.go
+++ b/clientv3/kv.go
@@ -164,7 +164,7 @@ func (kv *kv) do(ctx context.Context, op Op) (OpResponse, error) {
 		}
 	case tDeleteRange:
 		var resp *pb.DeleteRangeResponse
-		r := &pb.DeleteRangeRequest{Key: op.key, RangeEnd: op.end}
+		r := &pb.DeleteRangeRequest{Key: op.key, RangeEnd: op.end, PrevKv: op.prevKV}
 		resp, err = kv.remote.DeleteRange(ctx, r)
 		if err == nil {
 			return OpResponse{del: (*DeleteResponse)(resp)}, nil
diff --git a/clientv3/op.go b/clientv3/op.go
index 106fb2b9f..8d7f24c8a 100644
--- a/clientv3/op.go
+++ b/clientv3/op.go
@@ -47,6 +47,9 @@ type Op struct {
 	// for range, watch
 	rev int64
 
+	// for watch, put, delete
+	prevKV bool
+
 	// progressNotify is for progress updates.
 	progressNotify bool
 
@@ -76,7 +79,7 @@ func (op Op) toRequestOp() *pb.RequestOp {
 		r := &pb.PutRequest{Key: op.key, Value: op.val, Lease: int64(op.leaseID), PrevKv: op.prevKV}
 		return &pb.RequestOp{Request: &pb.RequestOp_RequestPut{RequestPut: r}}
 	case tDeleteRange:
-		r := &pb.DeleteRangeRequest{Key: op.key, RangeEnd: op.end}
+		r := &pb.DeleteRangeRequest{Key: op.key, RangeEnd: op.end, PrevKv: op.prevKV}
 		return &pb.RequestOp{Request: &pb.RequestOp_RequestDeleteRange{RequestDeleteRange: r}}
 	default:
 		panic("Unknown Op")