105 lines
2.0 KiB
Go
105 lines
2.0 KiB
Go
// +build kvdb_etcd
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package cluster
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import (
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"context"
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"io/ioutil"
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"os"
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"runtime/pprof"
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"sync"
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"testing"
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"time"
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"github.com/lightningnetwork/lnd/kvdb/etcd"
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"github.com/stretchr/testify/require"
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)
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// GuardTimeout implements a test level timeout guard.
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func GuardTimeout(t *testing.T, timeout time.Duration) func() {
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done := make(chan struct{})
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go func() {
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select {
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case <-time.After(timeout):
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err := pprof.Lookup("goroutine").WriteTo(os.Stdout, 1)
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require.NoError(t, err)
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panic("test timeout")
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case <-done:
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}
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}()
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return func() {
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close(done)
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}
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}
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// TestEtcdElector tests that two candidates competing for leadership works as
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// expected and that elected leader can resign and allow others to take on.
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func TestEtcdElector(t *testing.T) {
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guard := GuardTimeout(t, 5*time.Second)
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defer guard()
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tmpDir, err := ioutil.TempDir("", "etcd")
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if err != nil {
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t.Fatalf("unable to create temp dir: %v", err)
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}
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etcdCfg, cleanup, err := etcd.NewEmbeddedEtcdInstance(tmpDir, 0, 0)
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require.NoError(t, err)
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defer cleanup()
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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const (
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election = "/election/"
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id1 = "e1"
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id2 = "e2"
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)
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e1, err := newEtcdLeaderElector(
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ctx, id1, election, etcdCfg,
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)
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require.NoError(t, err)
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e2, err := newEtcdLeaderElector(
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ctx, id2, election, etcdCfg,
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)
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require.NoError(t, err)
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var wg sync.WaitGroup
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ch := make(chan *etcdLeaderElector)
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wg.Add(2)
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ctxb := context.Background()
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go func() {
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defer wg.Done()
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require.NoError(t, e1.Campaign(ctxb))
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ch <- e1
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}()
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go func() {
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defer wg.Done()
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require.NoError(t, e2.Campaign(ctxb))
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ch <- e2
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}()
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tmp := <-ch
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first, err := tmp.Leader(ctxb)
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require.NoError(t, err)
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require.NoError(t, tmp.Resign())
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tmp = <-ch
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second, err := tmp.Leader(ctxb)
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require.NoError(t, err)
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require.NoError(t, tmp.Resign())
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require.Contains(t, []string{id1, id2}, first)
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require.Contains(t, []string{id1, id2}, second)
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require.NotEqual(t, first, second)
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wg.Wait()
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}
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