github.com/docker/docker@v299999999.0.0-20200612211812-aaf470eca7b5+incompatible/daemon/logger/loggerutils/cache/log_cache_test.go (about)

     1  package cache
     2  
     3  import (
     4  	"context"
     5  	"testing"
     6  
     7  	"time"
     8  
     9  	"bytes"
    10  
    11  	"github.com/docker/docker/daemon/logger"
    12  	"gotest.tools/v3/assert"
    13  	"gotest.tools/v3/assert/cmp"
    14  )
    15  
    16  type fakeLogger struct {
    17  	messages chan logger.Message
    18  	close    chan struct{}
    19  }
    20  
    21  func (l *fakeLogger) Log(msg *logger.Message) error {
    22  	select {
    23  	case l.messages <- *msg:
    24  	case <-l.close:
    25  	}
    26  	logger.PutMessage(msg)
    27  	return nil
    28  }
    29  
    30  func (l *fakeLogger) Name() string {
    31  	return "fake"
    32  }
    33  
    34  func (l *fakeLogger) Close() error {
    35  	close(l.close)
    36  	return nil
    37  }
    38  
    39  func TestLog(t *testing.T) {
    40  	cacher := &fakeLogger{make(chan logger.Message), make(chan struct{})}
    41  	l := &loggerWithCache{
    42  		l:     &fakeLogger{make(chan logger.Message, 100), make(chan struct{})},
    43  		cache: cacher,
    44  	}
    45  	defer l.Close()
    46  
    47  	var messages []logger.Message
    48  	for i := 0; i < 100; i++ {
    49  		messages = append(messages, logger.Message{
    50  			Timestamp: time.Now(),
    51  			Line:      append(bytes.Repeat([]byte("a"), 100), '\n'),
    52  		})
    53  	}
    54  
    55  	ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
    56  	defer cancel()
    57  
    58  	go func() {
    59  		for _, msg := range messages {
    60  			select {
    61  			case <-ctx.Done():
    62  				return
    63  			default:
    64  			}
    65  
    66  			m := logger.NewMessage()
    67  			dumbCopyMessage(m, &msg)
    68  			l.Log(m)
    69  		}
    70  	}()
    71  
    72  	for _, m := range messages {
    73  		var msg logger.Message
    74  		select {
    75  		case <-ctx.Done():
    76  			t.Fatal("timed out waiting for messages... this is probably a test implementation error")
    77  		case msg = <-cacher.messages:
    78  			assert.Assert(t, cmp.DeepEqual(msg, m))
    79  		}
    80  	}
    81  }