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moby--moby/daemon/logger/copier_test.go
Ahmet Alp Balkan 3a8728b431 daemon: Logging drivers refactoring
- noplog driver pkg for '--log-driver=none' (null object pattern)
- centralized factory for log drivers (instead of case/switch)
- logging drivers registers themselves to factory upon import
  (easy plug/unplug of drivers in daemon/logdrivers.go)
- daemon now doesn't start with an invalid log driver
- Name() method of loggers is actually now their cli names (made it useful)
- generalized Read() logic, made it unsupported except json-file (preserves
  existing behavior)

Spotted some duplication code around processing of legacy json-file
format, didn't touch that and refactored in both places.

Signed-off-by: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>
2015-05-12 19:11:52 +00:00

108 lines
2.4 KiB
Go

package logger
import (
"bytes"
"encoding/json"
"errors"
"io"
"testing"
"time"
)
type TestLoggerJSON struct {
*json.Encoder
}
func (l *TestLoggerJSON) Log(m *Message) error { return l.Encode(m) }
func (l *TestLoggerJSON) Close() error { return nil }
func (l *TestLoggerJSON) Name() string { return "json" }
func (l *TestLoggerJSON) GetReader() (io.Reader, error) {
return nil, errors.New("not used in the test")
}
type TestLoggerText struct {
*bytes.Buffer
}
func (l *TestLoggerText) Log(m *Message) error {
_, err := l.WriteString(m.ContainerID + " " + m.Source + " " + string(m.Line) + "\n")
return err
}
func (l *TestLoggerText) Close() error { return nil }
func (l *TestLoggerText) Name() string { return "text" }
func (l *TestLoggerText) GetReader() (io.Reader, error) {
return nil, errors.New("not used in the test")
}
func TestCopier(t *testing.T) {
stdoutLine := "Line that thinks that it is log line from docker stdout"
stderrLine := "Line that thinks that it is log line from docker stderr"
var stdout bytes.Buffer
var stderr bytes.Buffer
for i := 0; i < 30; i++ {
if _, err := stdout.WriteString(stdoutLine + "\n"); err != nil {
t.Fatal(err)
}
if _, err := stderr.WriteString(stderrLine + "\n"); err != nil {
t.Fatal(err)
}
}
var jsonBuf bytes.Buffer
jsonLog := &TestLoggerJSON{Encoder: json.NewEncoder(&jsonBuf)}
cid := "a7317399f3f857173c6179d44823594f8294678dea9999662e5c625b5a1c7657"
c, err := NewCopier(cid,
map[string]io.Reader{
"stdout": &stdout,
"stderr": &stderr,
},
jsonLog)
if err != nil {
t.Fatal(err)
}
c.Run()
wait := make(chan struct{})
go func() {
c.Wait()
close(wait)
}()
select {
case <-time.After(1 * time.Second):
t.Fatal("Copier failed to do its work in 1 second")
case <-wait:
}
dec := json.NewDecoder(&jsonBuf)
for {
var msg Message
if err := dec.Decode(&msg); err != nil {
if err == io.EOF {
break
}
t.Fatal(err)
}
if msg.Source != "stdout" && msg.Source != "stderr" {
t.Fatalf("Wrong Source: %q, should be %q or %q", msg.Source, "stdout", "stderr")
}
if msg.ContainerID != cid {
t.Fatalf("Wrong ContainerID: %q, expected %q", msg.ContainerID, cid)
}
if msg.Source == "stdout" {
if string(msg.Line) != stdoutLine {
t.Fatalf("Wrong Line: %q, expected %q", msg.Line, stdoutLine)
}
}
if msg.Source == "stderr" {
if string(msg.Line) != stderrLine {
t.Fatalf("Wrong Line: %q, expected %q", msg.Line, stderrLine)
}
}
}
}