go.etcd.io/etcd@v3.3.27+incompatible/integration/v3_leadership_test.go (about)

     1  // Copyright 2017 The etcd Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package integration
    16  
    17  import (
    18  	"context"
    19  	"testing"
    20  	"time"
    21  
    22  	"github.com/coreos/etcd/etcdserver/api/v3rpc/rpctypes"
    23  	pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
    24  	"github.com/coreos/etcd/pkg/testutil"
    25  )
    26  
    27  func TestMoveLeader(t *testing.T)        { testMoveLeader(t, true) }
    28  func TestMoveLeaderService(t *testing.T) { testMoveLeader(t, false) }
    29  
    30  func testMoveLeader(t *testing.T, auto bool) {
    31  	defer testutil.AfterTest(t)
    32  
    33  	clus := NewClusterV3(t, &ClusterConfig{Size: 3})
    34  	defer clus.Terminate(t)
    35  
    36  	oldLeadIdx := clus.WaitLeader(t)
    37  	oldLeadID := uint64(clus.Members[oldLeadIdx].s.ID())
    38  
    39  	// ensure followers go through leader transition while learship transfer
    40  	idc := make(chan uint64)
    41  	for i := range clus.Members {
    42  		if oldLeadIdx != i {
    43  			go func(m *member) {
    44  				idc <- checkLeaderTransition(t, m, oldLeadID)
    45  			}(clus.Members[i])
    46  		}
    47  	}
    48  
    49  	target := uint64(clus.Members[(oldLeadIdx+1)%3].s.ID())
    50  	if auto {
    51  		err := clus.Members[oldLeadIdx].s.TransferLeadership()
    52  		if err != nil {
    53  			t.Fatal(err)
    54  		}
    55  	} else {
    56  		mvc := toGRPC(clus.Client(oldLeadIdx)).Maintenance
    57  		_, err := mvc.MoveLeader(context.TODO(), &pb.MoveLeaderRequest{TargetID: target})
    58  		if err != nil {
    59  			t.Fatal(err)
    60  		}
    61  	}
    62  
    63  	// wait until leader transitions have happened
    64  	var newLeadIDs [2]uint64
    65  	for i := range newLeadIDs {
    66  		select {
    67  		case newLeadIDs[i] = <-idc:
    68  		case <-time.After(time.Second):
    69  			t.Fatal("timed out waiting for leader transition")
    70  		}
    71  	}
    72  
    73  	// remaining members must agree on the same leader
    74  	if newLeadIDs[0] != newLeadIDs[1] {
    75  		t.Fatalf("expected same new leader %d == %d", newLeadIDs[0], newLeadIDs[1])
    76  	}
    77  
    78  	// new leader must be different than the old leader
    79  	if oldLeadID == newLeadIDs[0] {
    80  		t.Fatalf("expected old leader %d != new leader %d", oldLeadID, newLeadIDs[0])
    81  	}
    82  
    83  	// if move-leader were used, new leader must match transferee
    84  	if !auto {
    85  		if newLeadIDs[0] != target {
    86  			t.Fatalf("expected new leader %d != target %d", newLeadIDs[0], target)
    87  		}
    88  	}
    89  }
    90  
    91  // TestMoveLeaderError ensures that request to non-leader fail.
    92  func TestMoveLeaderError(t *testing.T) {
    93  	defer testutil.AfterTest(t)
    94  
    95  	clus := NewClusterV3(t, &ClusterConfig{Size: 3})
    96  	defer clus.Terminate(t)
    97  
    98  	oldLeadIdx := clus.WaitLeader(t)
    99  	followerIdx := (oldLeadIdx + 1) % 3
   100  
   101  	target := uint64(clus.Members[(oldLeadIdx+2)%3].s.ID())
   102  
   103  	mvc := toGRPC(clus.Client(followerIdx)).Maintenance
   104  	_, err := mvc.MoveLeader(context.TODO(), &pb.MoveLeaderRequest{TargetID: target})
   105  	if !eqErrGRPC(err, rpctypes.ErrGRPCNotLeader) {
   106  		t.Errorf("err = %v, want %v", err, rpctypes.ErrGRPCNotLeader)
   107  	}
   108  }