github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/pkg/notify/notify_test.go (about)

     1  // Copyright 2020 PingCAP, Inc.
     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  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package notify
    15  
    16  import (
    17  	"context"
    18  	"sync"
    19  	"testing"
    20  	"time"
    21  
    22  	"github.com/pingcap/tiflow/pkg/errors"
    23  	"github.com/stretchr/testify/require"
    24  	"go.uber.org/atomic"
    25  )
    26  
    27  func TestNotifyHub(t *testing.T) {
    28  	t.Parallel()
    29  
    30  	notifier := new(Notifier)
    31  	r1, err := notifier.NewReceiver(-1)
    32  	require.Nil(t, err)
    33  	r2, err := notifier.NewReceiver(-1)
    34  	require.Nil(t, err)
    35  	r3, err := notifier.NewReceiver(-1)
    36  	require.Nil(t, err)
    37  	finishedCh := make(chan struct{})
    38  	go func() {
    39  		for i := 0; i < 5; i++ {
    40  			time.Sleep(time.Second)
    41  			notifier.Notify()
    42  		}
    43  		close(finishedCh)
    44  	}()
    45  	<-r1.C
    46  	r1.Stop()
    47  	<-r2.C
    48  	<-r3.C
    49  
    50  	r2.Stop()
    51  	r3.Stop()
    52  	require.Equal(t, 0, len(notifier.receivers))
    53  	r4, err := notifier.NewReceiver(-1)
    54  	require.Nil(t, err)
    55  	<-r4.C
    56  	r4.Stop()
    57  
    58  	notifier2 := new(Notifier)
    59  	r5, err := notifier2.NewReceiver(10 * time.Millisecond)
    60  	require.Nil(t, err)
    61  	<-r5.C
    62  	r5.Stop()
    63  	<-finishedCh // To make the leak checker happy
    64  }
    65  
    66  func TestContinusStop(t *testing.T) {
    67  	t.Parallel()
    68  
    69  	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
    70  	defer cancel()
    71  	notifier := new(Notifier)
    72  	go func() {
    73  		for {
    74  			select {
    75  			case <-ctx.Done():
    76  				return
    77  			default:
    78  			}
    79  			notifier.Notify()
    80  		}
    81  	}()
    82  	n := 50
    83  	receivers := make([]*Receiver, n)
    84  	var err error
    85  	for i := 0; i < n; i++ {
    86  		receivers[i], err = notifier.NewReceiver(10 * time.Millisecond)
    87  		require.Nil(t, err)
    88  	}
    89  	for i := 0; i < n; i++ {
    90  		i := i
    91  		go func() {
    92  			for {
    93  				select {
    94  				case <-ctx.Done():
    95  					return
    96  				case <-receivers[i].C:
    97  				}
    98  			}
    99  		}()
   100  	}
   101  	for i := 0; i < n; i++ {
   102  		receivers[i].Stop()
   103  	}
   104  	<-ctx.Done()
   105  }
   106  
   107  func TestNewReceiverWithClosedNotifier(t *testing.T) {
   108  	t.Parallel()
   109  
   110  	notifier := new(Notifier)
   111  	notifier.Close()
   112  	_, err := notifier.NewReceiver(50 * time.Millisecond)
   113  	require.True(t, errors.ErrOperateOnClosedNotifier.Equal(err))
   114  }
   115  
   116  func TestNotifierMultiple(t *testing.T) {
   117  	t.Parallel()
   118  	notifier := new(Notifier)
   119  
   120  	receiver, err := notifier.NewReceiver(-1)
   121  	require.NoError(t, err)
   122  	counter := atomic.NewInt32(0)
   123  
   124  	var wg sync.WaitGroup
   125  	wg.Add(1)
   126  	go func() {
   127  		defer wg.Done()
   128  		for {
   129  			_, ok := <-receiver.C
   130  			if !ok {
   131  				return
   132  			}
   133  			counter.Add(1)
   134  		}
   135  	}()
   136  
   137  	receiver1, err := notifier.NewReceiver(time.Minute)
   138  	require.NoError(t, err)
   139  	counter1 := atomic.NewInt32(0)
   140  
   141  	wg.Add(1)
   142  	go func() {
   143  		defer wg.Done()
   144  		for {
   145  			_, ok := <-receiver1.C
   146  			if !ok {
   147  				return
   148  			}
   149  			counter1.Add(1)
   150  		}
   151  	}()
   152  
   153  	N := 5
   154  	for i := 0; i < N; i++ {
   155  		notifier.Notify()
   156  		time.Sleep(time.Millisecond * 100)
   157  	}
   158  
   159  	notifier.Close()
   160  	wg.Wait()
   161  	require.LessOrEqual(t, counter.Load(), int32(N))
   162  	require.LessOrEqual(t, counter1.Load(), int32(N))
   163  }