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// 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 e2e
import (
"os"
"strings"
"testing"
"time"
"go.etcd.io/etcd/pkg/v3/expect"
"go.etcd.io/etcd/tests/v3/framework/e2e"
)
func TestCtlV3Elect(t *testing.T) {
testCtl(t, testElect)
}
func testElect(cx ctlCtx) {
name := "a"
holder, ch, err := ctlV3Elect(cx, name, "p1")
if err != nil {
cx.t.Fatal(err)
}
l1 := ""
select {
case <-time.After(2 * time.Second):
cx.t.Fatalf("timed out electing")
case l1 = <-ch:
if !strings.HasPrefix(l1, name) {
cx.t.Errorf("got %q, expected %q prefix", l1, name)
}
}
// blocked process that won't win the election
blocked, ch, err := ctlV3Elect(cx, name, "p2")
if err != nil {
cx.t.Fatal(err)
}
select {
case <-time.After(100 * time.Millisecond):
case <-ch:
cx.t.Fatalf("should block")
}
// overlap with a blocker that will win the election
blockAcquire, ch, err := ctlV3Elect(cx, name, "p2")
if err != nil {
cx.t.Fatal(err)
}
defer blockAcquire.Stop()
select {
case <-time.After(100 * time.Millisecond):
case <-ch:
cx.t.Fatalf("should block")
}
// kill blocked process with clean shutdown
if err = blocked.Signal(os.Interrupt); err != nil {
cx.t.Fatal(err)
}
if err = e2e.CloseWithTimeout(blocked, time.Second); err != nil {
cx.t.Fatal(err)
}
// kill the holder with clean shutdown
if err = holder.Signal(os.Interrupt); err != nil {
cx.t.Fatal(err)
}
if err = e2e.CloseWithTimeout(holder, time.Second); err != nil {
cx.t.Fatal(err)
}
// blockAcquire should win the election
select {
case <-time.After(time.Second):
cx.t.Fatalf("timed out from waiting to holding")
case l2 := <-ch:
if l1 == l2 || !strings.HasPrefix(l2, name) {
cx.t.Fatalf("expected different elect name, got l1=%q, l2=%q", l1, l2)
}
}
}
// ctlV3Elect creates a elect process with a channel listening for when it wins the election.
func ctlV3Elect(cx ctlCtx, name, proposal string) (*expect.ExpectProcess, <-chan string, error) {
cmdArgs := append(cx.PrefixArgs(), "elect", name, proposal)
proc, err := e2e.SpawnCmd(cmdArgs, cx.envMap)
outc := make(chan string, 1)
if err != nil {
close(outc)
return proc, outc, err
}
go func() {
s, xerr := proc.ExpectFunc(func(string) bool { return true })
if xerr != nil {
cx.t.Errorf("expect failed (%v)", xerr)
}
outc <- s
}()
return proc, outc, err
}
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