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v3_barrier_test.go
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v3_barrier_test.go
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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 recipes_test
import (
"context"
"testing"
"time"
clientv3 "go.etcd.io/etcd/client/v3"
recipe "go.etcd.io/etcd/client/v3/experimental/recipes"
integration2 "go.etcd.io/etcd/tests/v3/framework/integration"
)
func TestBarrierSingleNode(t *testing.T) {
integration2.BeforeTest(t)
clus := integration2.NewCluster(t, &integration2.ClusterConfig{Size: 1})
defer clus.Terminate(t)
testBarrier(t, 5, func() *clientv3.Client { return clus.Client(0) })
}
func TestBarrierMultiNode(t *testing.T) {
integration2.BeforeTest(t)
clus := integration2.NewCluster(t, &integration2.ClusterConfig{Size: 3})
defer clus.Terminate(t)
testBarrier(t, 5, func() *clientv3.Client { return clus.RandClient() })
}
func testBarrier(t *testing.T, waiters int, chooseClient func() *clientv3.Client) {
b := recipe.NewBarrier(chooseClient(), "test-barrier")
if err := b.Hold(); err != nil {
t.Fatalf("could not hold barrier (%v)", err)
}
if err := b.Hold(); err == nil {
t.Fatalf("able to double-hold barrier")
}
// put a random key to move the revision forward
if _, err := chooseClient().Put(context.Background(), "x", ""); err != nil {
t.Errorf("could not put x (%v)", err)
}
donec := make(chan struct{})
stopc := make(chan struct{})
defer close(stopc)
for i := 0; i < waiters; i++ {
go func() {
br := recipe.NewBarrier(chooseClient(), "test-barrier")
if err := br.Wait(); err != nil {
t.Errorf("could not wait on barrier (%v)", err)
}
select {
case donec <- struct{}{}:
case <-stopc:
}
}()
}
select {
case <-donec:
t.Fatalf("barrier did not wait")
default:
}
if err := b.Release(); err != nil {
t.Fatalf("could not release barrier (%v)", err)
}
timerC := time.After(time.Duration(waiters*100) * time.Millisecond)
for i := 0; i < waiters; i++ {
select {
case <-timerC:
t.Fatalf("barrier timed out")
case <-donec:
}
}
}
func TestBarrierWaitNonexistentKey(t *testing.T) {
integration2.BeforeTest(t)
clus := integration2.NewCluster(t, &integration2.ClusterConfig{Size: 1})
defer clus.Terminate(t)
cli := clus.Client(0)
if _, err := cli.Put(cli.Ctx(), "test-barrier-0", ""); err != nil {
t.Errorf("could not put test-barrier0, err:%v", err)
}
donec := make(chan struct{})
stopc := make(chan struct{})
defer close(stopc)
waiters := 5
for i := 0; i < waiters; i++ {
go func() {
br := recipe.NewBarrier(cli, "test-barrier")
if err := br.Wait(); err != nil {
t.Errorf("could not wait on barrier (%v)", err)
}
select {
case donec <- struct{}{}:
case <-stopc:
}
}()
}
// all waiters should return immediately if waiting on a nonexistent key "test-barrier" even if key "test-barrier-0" exists
timerC := time.After(time.Duration(waiters*100) * time.Millisecond)
for i := 0; i < waiters; i++ {
select {
case <-timerC:
t.Fatal("barrier timed out")
case <-donec:
}
}
}