github.com/lfch/etcd-io/tests/v3@v3.0.0-20221004140520-eac99acd3e9d/integration/clientv3/experimental/recipes/v3_double_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/concurrency"
    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 TestDoubleBarrier(t *testing.T) {
    27  	integration2.BeforeTest(t)
    28  
    29  	clus := integration2.NewCluster(t, &integration2.ClusterConfig{Size: 3})
    30  	defer clus.Terminate(t)
    31  
    32  	waiters := 10
    33  	session, err := concurrency.NewSession(clus.RandClient())
    34  	if err != nil {
    35  		t.Error(err)
    36  	}
    37  	defer session.Orphan()
    38  
    39  	b := recipe.NewDoubleBarrier(session, "test-barrier", waiters)
    40  	donec := make(chan struct{})
    41  	defer close(donec)
    42  	for i := 0; i < waiters-1; i++ {
    43  		go func() {
    44  			session, err := concurrency.NewSession(clus.RandClient())
    45  			if err != nil {
    46  				t.Error(err)
    47  			}
    48  			defer session.Orphan()
    49  
    50  			bb := recipe.NewDoubleBarrier(session, "test-barrier", waiters)
    51  			if err := bb.Enter(); err != nil {
    52  				t.Errorf("could not enter on barrier (%v)", err)
    53  			}
    54  			<-donec
    55  			if err := bb.Leave(); err != nil {
    56  				t.Errorf("could not leave on barrier (%v)", err)
    57  			}
    58  			<-donec
    59  		}()
    60  	}
    61  
    62  	time.Sleep(10 * time.Millisecond)
    63  	select {
    64  	case donec <- struct{}{}:
    65  		t.Fatalf("barrier did not enter-wait")
    66  	default:
    67  	}
    68  
    69  	if err := b.Enter(); err != nil {
    70  		t.Fatalf("could not enter last barrier (%v)", err)
    71  	}
    72  
    73  	timerC := time.After(time.Duration(waiters*100) * time.Millisecond)
    74  	for i := 0; i < waiters-1; i++ {
    75  		select {
    76  		case <-timerC:
    77  			t.Fatalf("barrier enter timed out")
    78  		case donec <- struct{}{}:
    79  		}
    80  	}
    81  
    82  	time.Sleep(10 * time.Millisecond)
    83  	select {
    84  	case donec <- struct{}{}:
    85  		t.Fatalf("barrier did not leave-wait")
    86  	default:
    87  	}
    88  
    89  	b.Leave()
    90  	timerC = time.After(time.Duration(waiters*100) * time.Millisecond)
    91  	for i := 0; i < waiters-1; i++ {
    92  		select {
    93  		case <-timerC:
    94  			t.Fatalf("barrier leave timed out")
    95  		case donec <- struct{}{}:
    96  		}
    97  	}
    98  }
    99  
   100  func TestDoubleBarrierFailover(t *testing.T) {
   101  	integration2.BeforeTest(t)
   102  
   103  	clus := integration2.NewCluster(t, &integration2.ClusterConfig{Size: 3})
   104  	defer clus.Terminate(t)
   105  
   106  	waiters := 10
   107  	donec := make(chan struct{})
   108  	defer close(donec)
   109  
   110  	s0, err := concurrency.NewSession(clus.Client(0))
   111  	if err != nil {
   112  		t.Error(err)
   113  	}
   114  	defer s0.Orphan()
   115  	s1, err := concurrency.NewSession(clus.Client(0))
   116  	if err != nil {
   117  		t.Error(err)
   118  	}
   119  	defer s1.Orphan()
   120  
   121  	// sacrificial barrier holder; lease will be revoked
   122  	go func() {
   123  		b := recipe.NewDoubleBarrier(s0, "test-barrier", waiters)
   124  		if berr := b.Enter(); berr != nil {
   125  			t.Errorf("could not enter on barrier (%v)", berr)
   126  		}
   127  		<-donec
   128  	}()
   129  
   130  	for i := 0; i < waiters-1; i++ {
   131  		go func() {
   132  			b := recipe.NewDoubleBarrier(s1, "test-barrier", waiters)
   133  			if berr := b.Enter(); berr != nil {
   134  				t.Errorf("could not enter on barrier (%v)", berr)
   135  			}
   136  			<-donec
   137  			b.Leave()
   138  			<-donec
   139  		}()
   140  	}
   141  
   142  	// wait for barrier enter to unblock
   143  	for i := 0; i < waiters; i++ {
   144  		select {
   145  		case donec <- struct{}{}:
   146  		case <-time.After(10 * time.Second):
   147  			t.Fatalf("timed out waiting for enter, %d", i)
   148  		}
   149  	}
   150  
   151  	if err = s0.Close(); err != nil {
   152  		t.Fatal(err)
   153  	}
   154  	// join on rest of waiters
   155  	for i := 0; i < waiters-1; i++ {
   156  		select {
   157  		case donec <- struct{}{}:
   158  		case <-time.After(10 * time.Second):
   159  			t.Fatalf("timed out waiting for leave, %d", i)
   160  		}
   161  	}
   162  }