add dummy ForgetLeader to structs which implements raft.Node

Signed-off-by: Hitoshi Mitake <[email protected]>

server/etcdserver/raft.go

@@ -15,6 +15,7 @@
 package etcdserver
 
 import (
+	"context"
 	"expvar"
 	"fmt"
 	"log"
@@ -433,3 +434,7 @@ func (r *raftNode) advanceTicks(ticks int) {
 		r.tick()
 	}
 }
+
+func (r *raftNode) ForgetLeader(ctx context.Context) error {
+	return nil
+}

server/etcdserver/server_test.go

@@ -1832,6 +1832,10 @@ func (n *nodeRecorder) Compact(index uint64, nodes []uint64, d []byte) {
 	n.Record(testutil.Action{Name: "Compact"})
 }
 
+func (n *nodeRecorder) ForgetLeader(ctx context.Context) error {
+	return nil
+}
+
 type nodeProposalBlockerRecorder struct {
 	nodeRecorder
 }
@@ -1863,6 +1867,10 @@ func newNopReadyNode() *readyNode {
 
 func (n *readyNode) Ready() <-chan raft.Ready { return n.readyc }
 
+func (n *readyNode) ForgetLeader(ctx context.Context) error {
+	return nil
+}
+
 type nodeConfChangeCommitterRecorder struct {
 	readyNode
 	index uint64