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moby--moby/daemon/logger/adapter_test.go

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package logger
import (
"encoding/binary"
"io"
"io/ioutil"
"os"
"testing"
"time"
"github.com/docker/docker/api/types/plugins/logdriver"
protoio "github.com/gogo/protobuf/io"
"github.com/stretchr/testify/assert"
)
// mockLoggingPlugin implements the loggingPlugin interface for testing purposes
// it only supports a single log stream
type mockLoggingPlugin struct {
inStream io.ReadCloser
f *os.File
closed chan struct{}
t *testing.T
}
func (l *mockLoggingPlugin) StartLogging(file string, info Info) error {
go func() {
io.Copy(l.f, l.inStream)
close(l.closed)
}()
return nil
}
func (l *mockLoggingPlugin) StopLogging(file string) error {
l.inStream.Close()
l.f.Close()
os.Remove(l.f.Name())
return nil
}
func (l *mockLoggingPlugin) Capabilities() (cap Capability, err error) {
return Capability{ReadLogs: true}, nil
}
func (l *mockLoggingPlugin) ReadLogs(info Info, config ReadConfig) (io.ReadCloser, error) {
r, w := io.Pipe()
f, err := os.Open(l.f.Name())
if err != nil {
return nil, err
}
go func() {
defer f.Close()
dec := protoio.NewUint32DelimitedReader(f, binary.BigEndian, 1e6)
enc := logdriver.NewLogEntryEncoder(w)
for {
select {
case <-l.closed:
w.Close()
return
default:
}
var msg logdriver.LogEntry
if err := dec.ReadMsg(&msg); err != nil {
if err == io.EOF {
if !config.Follow {
w.Close()
return
}
dec = protoio.NewUint32DelimitedReader(f, binary.BigEndian, 1e6)
continue
}
l.t.Fatal(err)
continue
}
if err := enc.Encode(&msg); err != nil {
w.CloseWithError(err)
return
}
}
}()
return r, nil
}
func newMockPluginAdapter(t *testing.T) Logger {
r, w := io.Pipe()
f, err := ioutil.TempFile("", "mock-plugin-adapter")
assert.NoError(t, err)
enc := logdriver.NewLogEntryEncoder(w)
a := &pluginAdapterWithRead{
&pluginAdapter{
plugin: &mockLoggingPlugin{
inStream: r,
f: f,
closed: make(chan struct{}),
t: t,
},
stream: w,
enc: enc,
},
}
a.plugin.StartLogging("", Info{})
return a
}
func TestAdapterReadLogs(t *testing.T) {
l := newMockPluginAdapter(t)
testMsg := []Message{
{Line: []byte("Are you the keymaker?"), Timestamp: time.Now()},
{Line: []byte("Follow the white rabbit"), Timestamp: time.Now()},
}
for _, msg := range testMsg {
m := msg.copy()
assert.NoError(t, l.Log(m))
}
lr, ok := l.(LogReader)
assert.NotNil(t, ok)
lw := lr.ReadLogs(ReadConfig{})
for _, x := range testMsg {
select {
case msg := <-lw.Msg:
testMessageEqual(t, &x, msg)
case <-time.After(10 * time.Second):
t.Fatal("timeout reading logs")
}
}
select {
case _, ok := <-lw.Msg:
assert.False(t, ok, "expected message channel to be closed")
case <-time.After(10 * time.Second):
t.Fatal("timeout waiting for message channel to close")
}
lw.Close()
lw = lr.ReadLogs(ReadConfig{Follow: true})
for _, x := range testMsg {
select {
case msg := <-lw.Msg:
testMessageEqual(t, &x, msg)
case <-time.After(10 * time.Second):
t.Fatal("timeout reading logs")
}
}
x := Message{Line: []byte("Too infinity and beyond!"), Timestamp: time.Now()}
assert.NoError(t, l.Log(x.copy()))
select {
case msg, ok := <-lw.Msg:
assert.NotNil(t, ok, "message channel unexpectedly closed")
testMessageEqual(t, &x, msg)
case <-time.After(10 * time.Second):
t.Fatal("timeout reading logs")
}
l.Close()
select {
case msg, ok := <-lw.Msg:
assert.False(t, ok, "expected message channel to be closed")
assert.Nil(t, msg)
case <-time.After(10 * time.Second):
t.Fatal("timeout waiting for logger to close")
}
}
func testMessageEqual(t *testing.T, a, b *Message) {
assert.Equal(t, a.Line, b.Line)
assert.Equal(t, a.Timestamp.UnixNano(), b.Timestamp.UnixNano())
assert.Equal(t, a.Source, b.Source)
}