Remove the logger.Message ContainerID field

Log drivers are instantiated on a per-container basis, and passed the
container ID (along with other information) when they're initialized.
Drivers that care about that value are caching the value that they're
passed when they're initialized and using it in favor of the value
contained in Message structures that are passed to them, so the field in
Messages is unused, so we remove it.

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>

daemon/logger/copier.go

@@ -14,8 +14,6 @@ import (
 // ContainerID and Timestamp.
 // Writes are concurrent, so you need implement some sync in your logger
 type Copier struct {
-	// cid is the container id for which we are copying logs
-	cid string
 	// srcs is map of name -> reader pairs, for example "stdout", "stderr"
 	srcs     map[string]io.Reader
 	dst      Logger
@@ -24,9 +22,8 @@ type Copier struct {
 }
 
 // NewCopier creates a new Copier
-func NewCopier(cid string, srcs map[string]io.Reader, dst Logger) *Copier {
+func NewCopier(srcs map[string]io.Reader, dst Logger) *Copier {
 	return &Copier{
-		cid:    cid,
 		srcs:   srcs,
 		dst:    dst,
 		closed: make(chan struct{}),
@@ -56,7 +53,7 @@ func (c *Copier) copySrc(name string, src io.Reader) {
 			// ReadBytes can return full or partial output even when it failed.
 			// e.g. it can return a full entry and EOF.
 			if err == nil || len(line) > 0 {
-				if logErr := c.dst.Log(&Message{ContainerID: c.cid, Line: line, Source: name, Timestamp: time.Now().UTC()}); logErr != nil {
+				if logErr := c.dst.Log(&Message{Line: line, Source: name, Timestamp: time.Now().UTC()}); logErr != nil {
 					logrus.Errorf("Failed to log msg %q for logger %s: %s", line, c.dst.Name(), logErr)
 				}
 			}

daemon/logger/copier_test.go

@@ -28,19 +28,6 @@ func (l *TestLoggerJSON) Close() error { return nil }
 
 func (l *TestLoggerJSON) Name() string { return "json" }
 
-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 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"
@@ -59,8 +46,7 @@ func TestCopier(t *testing.T) {
 
 	jsonLog := &TestLoggerJSON{Encoder: json.NewEncoder(&jsonBuf)}
 
-	cid := "a7317399f3f857173c6179d44823594f8294678dea9999662e5c625b5a1c7657"
-	c := NewCopier(cid,
+	c := NewCopier(
 		map[string]io.Reader{
 			"stdout": &stdout,
 			"stderr": &stderr,
@@ -89,9 +75,6 @@ func TestCopier(t *testing.T) {
 		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)
@@ -118,8 +101,7 @@ func TestCopierSlow(t *testing.T) {
 	//encoder := &encodeCloser{Encoder: json.NewEncoder(&jsonBuf)}
 	jsonLog := &TestLoggerJSON{Encoder: json.NewEncoder(&jsonBuf), delay: 100 * time.Millisecond}
 
-	cid := "a7317399f3f857173c6179d44823594f8294678dea9999662e5c625b5a1c7657"
-	c := NewCopier(cid, map[string]io.Reader{"stdout": &stdout}, jsonLog)
+	c := NewCopier(map[string]io.Reader{"stdout": &stdout}, jsonLog)
 	c.Run()
 	wait := make(chan struct{})
 	go func() {

daemon/logger/journald/read.go

@@ -157,8 +157,7 @@ drain:
 				source = "stdout"
 			}
 			// Send the log message.
-			cid := s.vars["CONTAINER_ID_FULL"]
-			logWatcher.Msg <- &logger.Message{ContainerID: cid, Line: line, Source: source, Timestamp: timestamp}
+			logWatcher.Msg <- &logger.Message{Line: line, Source: source, Timestamp: timestamp}
 		}
 		// If we're at the end of the journal, we're done (for now).
 		if C.sd_journal_next(j) <= 0 {

daemon/logger/jsonfilelog/jsonfilelog_test.go

@@ -31,13 +31,13 @@ func TestJSONFileLogger(t *testing.T) {
 	}
 	defer l.Close()
 
-	if err := l.Log(&logger.Message{ContainerID: cid, Line: []byte("line1"), Source: "src1"}); err != nil {
+	if err := l.Log(&logger.Message{Line: []byte("line1"), Source: "src1"}); err != nil {
 		t.Fatal(err)
 	}
-	if err := l.Log(&logger.Message{ContainerID: cid, Line: []byte("line2"), Source: "src2"}); err != nil {
+	if err := l.Log(&logger.Message{Line: []byte("line2"), Source: "src2"}); err != nil {
 		t.Fatal(err)
 	}
-	if err := l.Log(&logger.Message{ContainerID: cid, Line: []byte("line3"), Source: "src3"}); err != nil {
+	if err := l.Log(&logger.Message{Line: []byte("line3"), Source: "src3"}); err != nil {
 		t.Fatal(err)
 	}
 	res, err := ioutil.ReadFile(filename)
@@ -72,7 +72,7 @@ func BenchmarkJSONFileLogger(b *testing.B) {
 	defer l.Close()
 
 	testLine := "Line that thinks that it is log line from docker\n"
-	msg := &logger.Message{ContainerID: cid, Line: []byte(testLine), Source: "stderr", Timestamp: time.Now().UTC()}
+	msg := &logger.Message{Line: []byte(testLine), Source: "stderr", Timestamp: time.Now().UTC()}
 	jsonlog, err := (&jsonlog.JSONLog{Log: string(msg.Line) + "\n", Stream: msg.Source, Created: msg.Timestamp}).MarshalJSON()
 	if err != nil {
 		b.Fatal(err)
@@ -107,7 +107,7 @@ func TestJSONFileLoggerWithOpts(t *testing.T) {
 	}
 	defer l.Close()
 	for i := 0; i < 20; i++ {
-		if err := l.Log(&logger.Message{ContainerID: cid, Line: []byte("line" + strconv.Itoa(i)), Source: "src1"}); err != nil {
+		if err := l.Log(&logger.Message{Line: []byte("line" + strconv.Itoa(i)), Source: "src1"}); err != nil {
 			t.Fatal(err)
 		}
 	}
@@ -172,7 +172,7 @@ func TestJSONFileLoggerWithLabelsEnv(t *testing.T) {
 		t.Fatal(err)
 	}
 	defer l.Close()
-	if err := l.Log(&logger.Message{ContainerID: cid, Line: []byte("line"), Source: "src1"}); err != nil {
+	if err := l.Log(&logger.Message{Line: []byte("line"), Source: "src1"}); err != nil {
 		t.Fatal(err)
 	}
 	res, err := ioutil.ReadFile(filename)
@@ -218,7 +218,7 @@ func BenchmarkJSONFileLoggerWithReader(b *testing.B) {
 		b.Fatal(err)
 	}
 	defer l.Close()
-	msg := &logger.Message{ContainerID: cid, Line: []byte("line"), Source: "src1"}
+	msg := &logger.Message{Line: []byte("line"), Source: "src1"}
 	jsonlog, err := (&jsonlog.JSONLog{Log: string(msg.Line) + "\n", Stream: msg.Source, Created: msg.Timestamp}).MarshalJSON()
 	if err != nil {
 		b.Fatal(err)

daemon/logger/logger.go

@@ -27,11 +27,10 @@ const (
 
 // Message is datastructure that represents record from some container.
 type Message struct {
-	ContainerID string
-	Line        []byte
-	Source      string
-	Timestamp   time.Time
-	Attrs       LogAttributes
+	Line      []byte
+	Source    string
+	Timestamp time.Time
+	Attrs     LogAttributes
 }
 
 // LogAttributes is used to hold the extra attributes available in the log message

daemon/logs.go

@@ -124,7 +124,7 @@ func (daemon *Daemon) StartLogging(container *container.Container) error {
 		return fmt.Errorf("Failed to initialize logging driver: %v", err)
 	}
 
-	copier := logger.NewCopier(container.ID, map[string]io.Reader{"stdout": container.StdoutPipe(), "stderr": container.StderrPipe()}, l)
+	copier := logger.NewCopier(map[string]io.Reader{"stdout": container.StdoutPipe(), "stderr": container.StderrPipe()}, l)
 	container.LogCopier = copier
 	copier.Run()
 	container.LogDriver = l