Add TCP support for GELF log driver

Signed-off-by: Ghislain Bourgeois <ghislain.bourgeois@gmail.com>

daemon/logger/gelf/gelf.go

@@ -47,10 +47,6 @@ func New(info logger.Info) (logger.Logger, error) {
 		return nil, err
 	}
 
-	if address.Scheme == "tcp" {
-		return nil, fmt.Errorf("gelf: TCP not yet implemented")
-	}
-
 	// collect extra data for GELF message
 	hostname, err := info.Hostname()
 	if err != nil {
@@ -93,10 +89,58 @@ func New(info logger.Info) (logger.Logger, error) {
 		return nil, err
 	}
 
-	// create new gelfWriter
+	var gelfWriter gelf.Writer
-	gelfWriter, err := gelf.NewUDPWriter(address.String())
+	if address.Scheme == "udp" {
+		gelfWriter, err = newGELFUDPWriter(address.Host, info)
 		if err != nil {
-		return nil, fmt.Errorf("gelf: cannot connect to GELF endpoint: %s %v", address.String(), err)
+			return nil, err
+		}
+	} else if address.Scheme == "tcp" {
+		gelfWriter, err = newGELFTCPWriter(address.Host, info)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return &gelfLogger{
+		writer:   gelfWriter,
+		info:     info,
+		hostname: hostname,
+		rawExtra: rawExtra,
+	}, nil
+}
+
+// create new TCP gelfWriter
+func newGELFTCPWriter(address string, info logger.Info) (gelf.Writer, error) {
+	gelfWriter, err := gelf.NewTCPWriter(address)
+	if err != nil {
+		return nil, fmt.Errorf("gelf: cannot connect to GELF endpoint: %s %v", address, err)
+	}
+
+	if v, ok := info.Config["gelf-tcp-max-reconnect"]; ok {
+		i, err := strconv.Atoi(v)
+		if err != nil || i < 0 {
+			return nil, fmt.Errorf("gelf-tcp-max-reconnect must be a positive integer")
+		}
+		gelfWriter.MaxReconnect = i
+	}
+
+	if v, ok := info.Config["gelf-tcp-reconnect-delay"]; ok {
+		i, err := strconv.Atoi(v)
+		if err != nil || i < 0 {
+			return nil, fmt.Errorf("gelf-tcp-reconnect-delay must be a positive integer")
+		}
+		gelfWriter.ReconnectDelay = time.Duration(i)
+	}
+
+	return gelfWriter, nil
+}
+
+// create new UDP gelfWriter
+func newGELFUDPWriter(address string, info logger.Info) (gelf.Writer, error) {
+	gelfWriter, err := gelf.NewUDPWriter(address)
+	if err != nil {
+		return nil, fmt.Errorf("gelf: cannot connect to GELF endpoint: %s %v", address, err)
 	}
 
 	if v, ok := info.Config["gelf-compression-type"]; ok {
@@ -120,12 +164,7 @@ func New(info logger.Info) (logger.Logger, error) {
 		gelfWriter.CompressionLevel = val
 	}
 
-	return &gelfLogger{
+	return gelfWriter, nil
-		writer:   gelfWriter,
-		info:     info,
-		hostname: hostname,
-		rawExtra: rawExtra,
-	}, nil
 }
 
 func (s *gelfLogger) Log(msg *logger.Message) error {

daemon/logger/gelf/gelf_test.go

@@ -3,7 +3,10 @@
 package gelf
 
 import (
+	"net"
 	"testing"
+
+	"github.com/docker/docker/daemon/logger"
 )
 
 // Validate parseAddress
@@ -27,51 +30,6 @@ func TestParseAddress(t *testing.T) {
 	}
 }
 
-//Validate UDP options
-func TestUDPValidateLogOpt(t *testing.T) {
-	err := ValidateLogOpt(map[string]string{
-		"gelf-address":           "udp://127.0.0.1:12201",
-		"tag":                    "testtag",
-		"labels":                 "testlabel",
-		"env":                    "testenv",
-		"env-regex":              "testenv-regex",
-		"gelf-compression-level": "9",
-		"gelf-compression-type":  "gzip",
-	})
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	err = ValidateLogOpt(map[string]string{
-		"gelf-address":           "udp://127.0.0.1:12201",
-		"gelf-compression-level": "ultra",
-		"gelf-compression-type":  "zlib",
-	})
-	if err == nil {
-		t.Fatal("Expected compression level error")
-	}
-
-	err = ValidateLogOpt(map[string]string{
-		"gelf-address":          "udp://127.0.0.1:12201",
-		"gelf-compression-type": "rar",
-	})
-	if err == nil {
-		t.Fatal("Expected compression type error")
-	}
-
-	err = ValidateLogOpt(map[string]string{
-		"invalid": "invalid",
-	})
-	if err == nil {
-		t.Fatal("Expected unknown option error")
-	}
-
-	err = ValidateLogOpt(map[string]string{})
-	if err == nil {
-		t.Fatal("Expected required parameter error")
-	}
-}
-
 // Validate TCP options
 func TestTCPValidateLogOpt(t *testing.T) {
 	err := ValidateLogOpt(map[string]string{
@@ -133,3 +91,170 @@ func TestTCPValidateLogOpt(t *testing.T) {
 		t.Fatal("Expected TCP reconnect to be invalid for UDP")
 	}
 }
+
+// Validate UDP options
+func TestUDPValidateLogOpt(t *testing.T) {
+	err := ValidateLogOpt(map[string]string{
+		"gelf-address":           "udp://127.0.0.1:12201",
+		"tag":                    "testtag",
+		"labels":                 "testlabel",
+		"env":                    "testenv",
+		"env-regex":              "testenv-regex",
+		"gelf-compression-level": "9",
+		"gelf-compression-type":  "gzip",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = ValidateLogOpt(map[string]string{
+		"gelf-address":           "udp://127.0.0.1:12201",
+		"gelf-compression-level": "ultra",
+		"gelf-compression-type":  "zlib",
+	})
+	if err == nil {
+		t.Fatal("Expected compression level error")
+	}
+
+	err = ValidateLogOpt(map[string]string{
+		"gelf-address":          "udp://127.0.0.1:12201",
+		"gelf-compression-type": "rar",
+	})
+	if err == nil {
+		t.Fatal("Expected compression type error")
+	}
+
+	err = ValidateLogOpt(map[string]string{
+		"invalid": "invalid",
+	})
+	if err == nil {
+		t.Fatal("Expected unknown option error")
+	}
+
+	err = ValidateLogOpt(map[string]string{})
+	if err == nil {
+		t.Fatal("Expected required parameter error")
+	}
+}
+
+// Validate newGELFTCPWriter
+func TestNewGELFTCPWriter(t *testing.T) {
+	address := "127.0.0.1:0"
+	tcpAddr, err := net.ResolveTCPAddr("tcp", address)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	listener, err := net.ListenTCP("tcp", tcpAddr)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	url := "tcp://" + listener.Addr().String()
+	info := logger.Info{
+		Config: map[string]string{
+			"gelf-address":             url,
+			"gelf-tcp-max-reconnect":   "0",
+			"gelf-tcp-reconnect-delay": "0",
+			"tag": "{{.ID}}",
+		},
+		ContainerID: "12345678901234567890",
+	}
+
+	writer, err := newGELFTCPWriter(listener.Addr().String(), info)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = writer.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = listener.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+// Validate newGELFUDPWriter
+func TestNewGELFUDPWriter(t *testing.T) {
+	address := "127.0.0.1:0"
+	info := logger.Info{
+		Config: map[string]string{
+			"gelf-address":           "udp://127.0.0.1:0",
+			"gelf-compression-level": "5",
+			"gelf-compression-type":  "gzip",
+		},
+	}
+
+	writer, err := newGELFUDPWriter(address, info)
+	if err != nil {
+		t.Fatal(err)
+	}
+	writer.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+// Validate New for TCP
+func TestNewTCP(t *testing.T) {
+	address := "127.0.0.1:0"
+	tcpAddr, err := net.ResolveTCPAddr("tcp", address)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	listener, err := net.ListenTCP("tcp", tcpAddr)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	url := "tcp://" + listener.Addr().String()
+	info := logger.Info{
+		Config: map[string]string{
+			"gelf-address":             url,
+			"gelf-tcp-max-reconnect":   "0",
+			"gelf-tcp-reconnect-delay": "0",
+		},
+		ContainerID: "12345678901234567890",
+	}
+
+	logger, err := New(info)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = logger.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = listener.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+// Validate New for UDP
+func TestNewUDP(t *testing.T) {
+	info := logger.Info{
+		Config: map[string]string{
+			"gelf-address":           "udp://127.0.0.1:0",
+			"gelf-compression-level": "5",
+			"gelf-compression-type":  "gzip",
+		},
+		ContainerID: "12345678901234567890",
+	}
+
+	logger, err := New(info)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = logger.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+}