etcdserver: transfer leadership when stopping

etcdserver/util_test.go

@@ -0,0 +1,89 @@
+// Copyright 2016 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package etcdserver
+
+import (
+	"net/http"
+	"testing"
+	"time"
+
+	"github.com/coreos/etcd/etcdserver/membership"
+	"github.com/coreos/etcd/pkg/types"
+	"github.com/coreos/etcd/raft/raftpb"
+	"github.com/coreos/etcd/rafthttp"
+	"github.com/coreos/etcd/snap"
+)
+
+func TestLongestConnected(t *testing.T) {
+	umap, err := types.NewURLsMap("mem1=http://10.1:2379,mem2=http://10.2:2379,mem3=http://10.3:2379")
+	if err != nil {
+		t.Fatal(err)
+	}
+	clus, err := membership.NewClusterFromURLsMap("test", umap)
+	if err != nil {
+		t.Fatal(err)
+	}
+	memberIDs := clus.MemberIDs()
+
+	tr := newNopTransporterWithActiveTime(memberIDs)
+	transferee, ok := longestConnected(tr, memberIDs)
+	if !ok {
+		t.Fatalf("unexpected ok %v", ok)
+	}
+	if memberIDs[0] != transferee {
+		t.Fatalf("expected first member %s to be transferee, got %s", memberIDs[0], transferee)
+	}
+
+	// make all members non-active
+	amap := make(map[types.ID]time.Time)
+	for _, id := range memberIDs {
+		amap[id] = time.Time{}
+	}
+	tr.(*nopTransporterWithActiveTime).reset(amap)
+
+	_, ok2 := longestConnected(tr, memberIDs)
+	if ok2 {
+		t.Fatalf("unexpected ok %v", ok)
+	}
+}
+
+type nopTransporterWithActiveTime struct {
+	activeMap map[types.ID]time.Time
+}
+
+// newNopTransporterWithActiveTime creates nopTransporterWithActiveTime with the first member
+// being the most stable (longest active-since time).
+func newNopTransporterWithActiveTime(memberIDs []types.ID) rafthttp.Transporter {
+	am := make(map[types.ID]time.Time)
+	for i, id := range memberIDs {
+		am[id] = time.Now().Add(time.Duration(i) * time.Second)
+	}
+	return &nopTransporterWithActiveTime{activeMap: am}
+}
+
+func (s *nopTransporterWithActiveTime) Start() error                        { return nil }
+func (s *nopTransporterWithActiveTime) Handler() http.Handler               { return nil }
+func (s *nopTransporterWithActiveTime) Send(m []raftpb.Message)             {}
+func (s *nopTransporterWithActiveTime) SendSnapshot(m snap.Message)         {}
+func (s *nopTransporterWithActiveTime) AddRemote(id types.ID, us []string)  {}
+func (s *nopTransporterWithActiveTime) AddPeer(id types.ID, us []string)    {}
+func (s *nopTransporterWithActiveTime) RemovePeer(id types.ID)              {}
+func (s *nopTransporterWithActiveTime) RemoveAllPeers()                     {}
+func (s *nopTransporterWithActiveTime) UpdatePeer(id types.ID, us []string) {}
+func (s *nopTransporterWithActiveTime) ActiveSince(id types.ID) time.Time   { return s.activeMap[id] }
+func (s *nopTransporterWithActiveTime) Stop()                               {}
+func (s *nopTransporterWithActiveTime) Pause()                              {}
+func (s *nopTransporterWithActiveTime) Resume()                             {}
+func (s *nopTransporterWithActiveTime) reset(am map[types.ID]time.Time)     { s.activeMap = am }