137 lines
3.4 KiB
Go
137 lines
3.4 KiB
Go
// Copyright 2016 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package integration
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import (
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"fmt"
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"testing"
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"time"
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"github.com/coreos/etcd/contrib/recipes"
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)
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// TestElectionWait tests if followers can correcty wait for elections.
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func TestElectionWait(t *testing.T) {
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clus := NewClusterV3(t, &ClusterConfig{Size: 3})
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defer clus.Terminate(t)
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defer closeSessionLease(clus)
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leaders := 3
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followers := 3
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electedc := make(chan string)
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nextc := []chan struct{}{}
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// wait for all elections
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donec := make(chan struct{})
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for i := 0; i < followers; i++ {
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nextc = append(nextc, make(chan struct{}))
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go func(ch chan struct{}) {
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for j := 0; j < leaders; j++ {
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b := recipe.NewElection(clus.RandClient(), "test-election")
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s, err := b.Wait()
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if err != nil {
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t.Fatalf("could not wait for election (%v)", err)
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}
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electedc <- s
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// wait for next election round
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<-ch
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}
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donec <- struct{}{}
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}(nextc[i])
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}
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// elect some leaders
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for i := 0; i < leaders; i++ {
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go func() {
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e := recipe.NewElection(clus.RandClient(), "test-election")
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ev := fmt.Sprintf("electval-%v", time.Now().UnixNano())
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if err := e.Volunteer(ev); err != nil {
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t.Fatalf("failed volunteer (%v)", err)
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}
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// wait for followers to accept leadership
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for j := 0; j < followers; j++ {
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s := <-electedc
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if s != ev {
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t.Errorf("wrong election value got %s, wanted %s", s, ev)
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}
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}
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// let next leader take over
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if err := e.Resign(); err != nil {
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t.Fatalf("failed resign (%v)", err)
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}
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// tell followers to start listening for next leader
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for j := 0; j < followers; j++ {
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nextc[j] <- struct{}{}
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}
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}()
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}
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// wait on followers
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for i := 0; i < followers; i++ {
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<-donec
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}
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}
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// TestElectionFailover tests that an election will
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func TestElectionFailover(t *testing.T) {
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clus := NewClusterV3(t, &ClusterConfig{Size: 3})
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defer clus.Terminate(t)
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defer closeSessionLease(clus)
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// first leader (elected)
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e := recipe.NewElection(clus.clients[0], "test-election")
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if err := e.Volunteer("foo"); err != nil {
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t.Fatalf("failed volunteer (%v)", err)
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}
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// check first leader
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s, err := e.Wait()
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if err != nil {
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t.Fatalf("could not wait for first election (%v)", err)
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}
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if s != "foo" {
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t.Fatalf("wrong election result. got %s, wanted foo", s)
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}
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// next leader
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electedc := make(chan struct{})
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go func() {
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ee := recipe.NewElection(clus.clients[1], "test-election")
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if eer := ee.Volunteer("bar"); eer != nil {
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t.Fatal(eer)
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}
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electedc <- struct{}{}
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}()
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// invoke leader failover
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err = recipe.RevokeSessionLease(clus.clients[0])
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if err != nil {
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t.Fatal(err)
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}
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// check new leader
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e = recipe.NewElection(clus.clients[2], "test-election")
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s, err = e.Wait()
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if err != nil {
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t.Fatalf("could not wait for second election (%v)", err)
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}
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if s != "bar" {
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t.Fatalf("wrong election result. got %s, wanted bar", s)
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}
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// leader must ack election (otherwise, Volunteer may see closed conn)
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<-electedc
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}
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