github.com/lfch/etcd-io/tests/v3@v3.0.0-20221004140520-eac99acd3e9d/integration/clientv3/experimental/recipes/v3_barrier_test.go (about)

     1  // Copyright 2016 The etcd Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package recipes_test
    16  
    17  import (
    18  	"testing"
    19  	"time"
    20  
    21  	"github.com/lfch/etcd-io/client/v3"
    22  	recipe "github.com/lfch/etcd-io/client/v3/experimental/recipes"
    23  	integration2 "github.com/lfch/etcd-io/tests/v3/framework/integration"
    24  )
    25  
    26  func TestBarrierSingleNode(t *testing.T) {
    27  	integration2.BeforeTest(t)
    28  	clus := integration2.NewCluster(t, &integration2.ClusterConfig{Size: 1})
    29  	defer clus.Terminate(t)
    30  	testBarrier(t, 5, func() *clientv3.Client { return clus.Client(0) })
    31  }
    32  
    33  func TestBarrierMultiNode(t *testing.T) {
    34  	integration2.BeforeTest(t)
    35  	clus := integration2.NewCluster(t, &integration2.ClusterConfig{Size: 3})
    36  	defer clus.Terminate(t)
    37  	testBarrier(t, 5, func() *clientv3.Client { return clus.RandClient() })
    38  }
    39  
    40  func testBarrier(t *testing.T, waiters int, chooseClient func() *clientv3.Client) {
    41  	b := recipe.NewBarrier(chooseClient(), "test-barrier")
    42  	if err := b.Hold(); err != nil {
    43  		t.Fatalf("could not hold barrier (%v)", err)
    44  	}
    45  	if err := b.Hold(); err == nil {
    46  		t.Fatalf("able to double-hold barrier")
    47  	}
    48  
    49  	donec := make(chan struct{})
    50  	stopc := make(chan struct{})
    51  	defer close(stopc)
    52  
    53  	for i := 0; i < waiters; i++ {
    54  		go func() {
    55  			br := recipe.NewBarrier(chooseClient(), "test-barrier")
    56  			if err := br.Wait(); err != nil {
    57  				t.Errorf("could not wait on barrier (%v)", err)
    58  			}
    59  			select {
    60  			case donec <- struct{}{}:
    61  			case <-stopc:
    62  			}
    63  
    64  		}()
    65  	}
    66  
    67  	select {
    68  	case <-donec:
    69  		t.Fatalf("barrier did not wait")
    70  	default:
    71  	}
    72  
    73  	if err := b.Release(); err != nil {
    74  		t.Fatalf("could not release barrier (%v)", err)
    75  	}
    76  
    77  	timerC := time.After(time.Duration(waiters*100) * time.Millisecond)
    78  	for i := 0; i < waiters; i++ {
    79  		select {
    80  		case <-timerC:
    81  			t.Fatalf("barrier timed out")
    82  		case <-donec:
    83  		}
    84  	}
    85  }