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

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package logger // import "github.com/docker/docker/daemon/logger"
import (
"encoding/binary"
"io"
"sync"
"testing"
"time"
"github.com/docker/docker/api/types/plugins/logdriver"
protoio "github.com/gogo/protobuf/io"
"gotest.tools/v3/assert"
is "gotest.tools/v3/assert/cmp"
)
// mockLoggingPlugin implements the loggingPlugin interface for testing purposes
// it only supports a single log stream
type mockLoggingPlugin struct {
io.WriteCloser
inStream io.Reader
logs []*logdriver.LogEntry
c *sync.Cond
err error
}
func newMockLoggingPlugin() *mockLoggingPlugin {
r, w := io.Pipe()
return &mockLoggingPlugin{
WriteCloser: w,
inStream: r,
logs: []*logdriver.LogEntry{},
c: sync.NewCond(new(sync.Mutex)),
}
}
func (l *mockLoggingPlugin) StartLogging(file string, info Info) error {
go func() {
dec := protoio.NewUint32DelimitedReader(l.inStream, binary.BigEndian, 1e6)
for {
var msg logdriver.LogEntry
if err := dec.ReadMsg(&msg); err != nil {
l.c.L.Lock()
if l.err == nil {
l.err = err
}
l.c.L.Unlock()
l.c.Broadcast()
return
}
l.c.L.Lock()
l.logs = append(l.logs, &msg)
l.c.L.Unlock()
l.c.Broadcast()
}
}()
return nil
}
func (l *mockLoggingPlugin) StopLogging(file string) error {
l.c.L.Lock()
if l.err == nil {
l.err = io.EOF
}
l.c.L.Unlock()
l.c.Broadcast()
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()
go func() {
var idx int
enc := logdriver.NewLogEntryEncoder(w)
l.c.L.Lock()
defer l.c.L.Unlock()
for {
if l.err != nil {
w.Close()
return
}
if idx >= len(l.logs) {
if !config.Follow {
w.Close()
return
}
l.c.Wait()
continue
}
if err := enc.Encode(l.logs[idx]); err != nil {
w.CloseWithError(err)
return
}
idx++
}
}()
return r, nil
}
func (l *mockLoggingPlugin) waitLen(i int) {
l.c.L.Lock()
defer l.c.L.Unlock()
for len(l.logs) < i {
l.c.Wait()
}
}
func (l *mockLoggingPlugin) check(t *testing.T) {
if l.err != nil && l.err != io.EOF {
t.Fatal(l.err)
}
}
func newMockPluginAdapter(plugin *mockLoggingPlugin) Logger {
enc := logdriver.NewLogEntryEncoder(plugin)
a := &pluginAdapterWithRead{
&pluginAdapter{
plugin: plugin,
stream: plugin,
enc: enc,
},
}
a.plugin.StartLogging("", Info{})
return a
}
func TestAdapterReadLogs(t *testing.T) {
plugin := newMockLoggingPlugin()
l := newMockPluginAdapter(plugin)
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.Check(t, l.Log(m))
}
// Wait until messages are read into plugin
plugin.waitLen(len(testMsg))
lr, ok := l.(LogReader)
assert.Check(t, ok, "Logger does not implement LogReader")
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.Check(t, !ok, "expected message channel to be closed")
case <-time.After(10 * time.Second):
t.Fatal("timeout waiting for message channel to close")
}
lw.ConsumerGone()
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.Check(t, l.Log(x.copy()))
select {
case msg, ok := <-lw.Msg:
assert.Check(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.Check(t, !ok, "expected message channel to be closed")
assert.Check(t, is.Nil(msg))
case <-time.After(10 * time.Second):
t.Fatal("timeout waiting for logger to close")
}
plugin.check(t)
}
func testMessageEqual(t *testing.T, a, b *Message) {
assert.Check(t, is.DeepEqual(a.Line, b.Line))
assert.Check(t, is.DeepEqual(a.Timestamp.UnixNano(), b.Timestamp.UnixNano()))
assert.Check(t, is.Equal(a.Source, b.Source))
}