mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
26f9b4be8f
The commit ensures that spawned etcdctl processes are "closed", so they perform proper os wait processing. This might have contributed to file-descriptor/open-files limit being exceeded.
116 lines
2.8 KiB
Go
116 lines
2.8 KiB
Go
// Copyright 2016 The etcd Authors
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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 e2e
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import (
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"os"
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"strings"
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"testing"
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"time"
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"go.etcd.io/etcd/pkg/v3/expect"
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)
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func TestCtlV3Elect(t *testing.T) {
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testCtl(t, testElect)
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}
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func testElect(cx ctlCtx) {
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name := "a"
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holder, ch, err := ctlV3Elect(cx, name, "p1")
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if err != nil {
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cx.t.Fatal(err)
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}
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l1 := ""
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select {
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case <-time.After(2 * time.Second):
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cx.t.Fatalf("timed out electing")
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case l1 = <-ch:
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if !strings.HasPrefix(l1, name) {
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cx.t.Errorf("got %q, expected %q prefix", l1, name)
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}
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}
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// blocked process that won't win the election
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blocked, ch, err := ctlV3Elect(cx, name, "p2")
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if err != nil {
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cx.t.Fatal(err)
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}
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select {
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case <-time.After(100 * time.Millisecond):
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case <-ch:
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cx.t.Fatalf("should block")
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}
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// overlap with a blocker that will win the election
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blockAcquire, ch, err := ctlV3Elect(cx, name, "p2")
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if err != nil {
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cx.t.Fatal(err)
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}
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defer blockAcquire.Stop()
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select {
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case <-time.After(100 * time.Millisecond):
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case <-ch:
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cx.t.Fatalf("should block")
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}
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// kill blocked process with clean shutdown
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if err = blocked.Signal(os.Interrupt); err != nil {
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cx.t.Fatal(err)
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}
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if err = closeWithTimeout(blocked, time.Second); err != nil {
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cx.t.Fatal(err)
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}
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// kill the holder with clean shutdown
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if err = holder.Signal(os.Interrupt); err != nil {
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cx.t.Fatal(err)
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}
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if err = closeWithTimeout(holder, time.Second); err != nil {
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cx.t.Fatal(err)
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}
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// blockAcquire should win the election
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select {
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case <-time.After(time.Second):
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cx.t.Fatalf("timed out from waiting to holding")
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case l2 := <-ch:
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if l1 == l2 || !strings.HasPrefix(l2, name) {
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cx.t.Fatalf("expected different elect name, got l1=%q, l2=%q", l1, l2)
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}
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}
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}
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// ctlV3Elect creates a elect process with a channel listening for when it wins the election.
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func ctlV3Elect(cx ctlCtx, name, proposal string) (*expect.ExpectProcess, <-chan string, error) {
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cmdArgs := append(cx.PrefixArgs(), "elect", name, proposal)
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proc, err := spawnCmd(cmdArgs)
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outc := make(chan string, 1)
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if err != nil {
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close(outc)
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return proc, outc, err
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}
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go func() {
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s, xerr := proc.ExpectFunc(func(string) bool { return true })
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if xerr != nil {
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cx.t.Errorf("expect failed (%v)", xerr)
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}
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outc <- s
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}()
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return proc, outc, err
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}
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