github.com/gunjan5/docker@v1.8.2/daemon/logger/copier_test.go (about)

     1  package logger
     2  
     3  import (
     4  	"bytes"
     5  	"encoding/json"
     6  	"io"
     7  	"testing"
     8  	"time"
     9  )
    10  
    11  type TestLoggerJSON struct {
    12  	*json.Encoder
    13  }
    14  
    15  func (l *TestLoggerJSON) Log(m *Message) error { return l.Encode(m) }
    16  
    17  func (l *TestLoggerJSON) Close() error { return nil }
    18  
    19  func (l *TestLoggerJSON) Name() string { return "json" }
    20  
    21  type TestLoggerText struct {
    22  	*bytes.Buffer
    23  }
    24  
    25  func (l *TestLoggerText) Log(m *Message) error {
    26  	_, err := l.WriteString(m.ContainerID + " " + m.Source + " " + string(m.Line) + "\n")
    27  	return err
    28  }
    29  
    30  func (l *TestLoggerText) Close() error { return nil }
    31  
    32  func (l *TestLoggerText) Name() string { return "text" }
    33  
    34  func TestCopier(t *testing.T) {
    35  	stdoutLine := "Line that thinks that it is log line from docker stdout"
    36  	stderrLine := "Line that thinks that it is log line from docker stderr"
    37  	var stdout bytes.Buffer
    38  	var stderr bytes.Buffer
    39  	for i := 0; i < 30; i++ {
    40  		if _, err := stdout.WriteString(stdoutLine + "\n"); err != nil {
    41  			t.Fatal(err)
    42  		}
    43  		if _, err := stderr.WriteString(stderrLine + "\n"); err != nil {
    44  			t.Fatal(err)
    45  		}
    46  	}
    47  
    48  	var jsonBuf bytes.Buffer
    49  
    50  	jsonLog := &TestLoggerJSON{Encoder: json.NewEncoder(&jsonBuf)}
    51  
    52  	cid := "a7317399f3f857173c6179d44823594f8294678dea9999662e5c625b5a1c7657"
    53  	c, err := NewCopier(cid,
    54  		map[string]io.Reader{
    55  			"stdout": &stdout,
    56  			"stderr": &stderr,
    57  		},
    58  		jsonLog)
    59  	if err != nil {
    60  		t.Fatal(err)
    61  	}
    62  	c.Run()
    63  	wait := make(chan struct{})
    64  	go func() {
    65  		c.Wait()
    66  		close(wait)
    67  	}()
    68  	select {
    69  	case <-time.After(1 * time.Second):
    70  		t.Fatal("Copier failed to do its work in 1 second")
    71  	case <-wait:
    72  	}
    73  	dec := json.NewDecoder(&jsonBuf)
    74  	for {
    75  		var msg Message
    76  		if err := dec.Decode(&msg); err != nil {
    77  			if err == io.EOF {
    78  				break
    79  			}
    80  			t.Fatal(err)
    81  		}
    82  		if msg.Source != "stdout" && msg.Source != "stderr" {
    83  			t.Fatalf("Wrong Source: %q, should be %q or %q", msg.Source, "stdout", "stderr")
    84  		}
    85  		if msg.ContainerID != cid {
    86  			t.Fatalf("Wrong ContainerID: %q, expected %q", msg.ContainerID, cid)
    87  		}
    88  		if msg.Source == "stdout" {
    89  			if string(msg.Line) != stdoutLine {
    90  				t.Fatalf("Wrong Line: %q, expected %q", msg.Line, stdoutLine)
    91  			}
    92  		}
    93  		if msg.Source == "stderr" {
    94  			if string(msg.Line) != stderrLine {
    95  				t.Fatalf("Wrong Line: %q, expected %q", msg.Line, stderrLine)
    96  			}
    97  		}
    98  	}
    99  }