github.com/webwurst/docker@v1.7.0/daemon/logger/copier_test.go (about)

     1  package logger
     2  
     3  import (
     4  	"bytes"
     5  	"encoding/json"
     6  	"errors"
     7  	"io"
     8  	"testing"
     9  	"time"
    10  )
    11  
    12  type TestLoggerJSON struct {
    13  	*json.Encoder
    14  }
    15  
    16  func (l *TestLoggerJSON) Log(m *Message) error { return l.Encode(m) }
    17  
    18  func (l *TestLoggerJSON) Close() error { return nil }
    19  
    20  func (l *TestLoggerJSON) Name() string { return "json" }
    21  
    22  func (l *TestLoggerJSON) GetReader() (io.Reader, error) {
    23  	return nil, errors.New("not used in the test")
    24  }
    25  
    26  type TestLoggerText struct {
    27  	*bytes.Buffer
    28  }
    29  
    30  func (l *TestLoggerText) Log(m *Message) error {
    31  	_, err := l.WriteString(m.ContainerID + " " + m.Source + " " + string(m.Line) + "\n")
    32  	return err
    33  }
    34  
    35  func (l *TestLoggerText) Close() error { return nil }
    36  
    37  func (l *TestLoggerText) Name() string { return "text" }
    38  
    39  func (l *TestLoggerText) GetReader() (io.Reader, error) {
    40  	return nil, errors.New("not used in the test")
    41  }
    42  
    43  func TestCopier(t *testing.T) {
    44  	stdoutLine := "Line that thinks that it is log line from docker stdout"
    45  	stderrLine := "Line that thinks that it is log line from docker stderr"
    46  	var stdout bytes.Buffer
    47  	var stderr bytes.Buffer
    48  	for i := 0; i < 30; i++ {
    49  		if _, err := stdout.WriteString(stdoutLine + "\n"); err != nil {
    50  			t.Fatal(err)
    51  		}
    52  		if _, err := stderr.WriteString(stderrLine + "\n"); err != nil {
    53  			t.Fatal(err)
    54  		}
    55  	}
    56  
    57  	var jsonBuf bytes.Buffer
    58  
    59  	jsonLog := &TestLoggerJSON{Encoder: json.NewEncoder(&jsonBuf)}
    60  
    61  	cid := "a7317399f3f857173c6179d44823594f8294678dea9999662e5c625b5a1c7657"
    62  	c, err := NewCopier(cid,
    63  		map[string]io.Reader{
    64  			"stdout": &stdout,
    65  			"stderr": &stderr,
    66  		},
    67  		jsonLog)
    68  	if err != nil {
    69  		t.Fatal(err)
    70  	}
    71  	c.Run()
    72  	wait := make(chan struct{})
    73  	go func() {
    74  		c.Wait()
    75  		close(wait)
    76  	}()
    77  	select {
    78  	case <-time.After(1 * time.Second):
    79  		t.Fatal("Copier failed to do its work in 1 second")
    80  	case <-wait:
    81  	}
    82  	dec := json.NewDecoder(&jsonBuf)
    83  	for {
    84  		var msg Message
    85  		if err := dec.Decode(&msg); err != nil {
    86  			if err == io.EOF {
    87  				break
    88  			}
    89  			t.Fatal(err)
    90  		}
    91  		if msg.Source != "stdout" && msg.Source != "stderr" {
    92  			t.Fatalf("Wrong Source: %q, should be %q or %q", msg.Source, "stdout", "stderr")
    93  		}
    94  		if msg.ContainerID != cid {
    95  			t.Fatalf("Wrong ContainerID: %q, expected %q", msg.ContainerID, cid)
    96  		}
    97  		if msg.Source == "stdout" {
    98  			if string(msg.Line) != stdoutLine {
    99  				t.Fatalf("Wrong Line: %q, expected %q", msg.Line, stdoutLine)
   100  			}
   101  		}
   102  		if msg.Source == "stderr" {
   103  			if string(msg.Line) != stderrLine {
   104  				t.Fatalf("Wrong Line: %q, expected %q", msg.Line, stderrLine)
   105  			}
   106  		}
   107  	}
   108  }