Merge pull request #1275 from ploubser/issue_1267

(#1267) Don't print empty message string when --translate is passed

Author: ripienaar

cli/util.go

@@ -752,7 +752,7 @@ func (pr *progressRW) Write(p []byte) (n int, err error) {
 }
 
 func outPutMSGBodyCompact(data []byte, filter string, subject string, stream string) (string, error) {
-	if len(data) == 0 {
+	if len(data) == 0 && filter == "" {
 		fmt.Println("nil body")
 		return "", nil
 	}

nats/sub_command_test.go

@@ -30,15 +30,17 @@ func TestSubscribe(t *testing.T) {
 	testMsgData := "this is a test string"
 	defer srv.Shutdown()
 
-	mgr.NewStream("ORDERS", jsm.Subjects("ORDERS.*"))
+	_, err := mgr.NewStream("ORDERS", jsm.Subjects("ORDERS.*"))
+	if err != nil {
+		t.Fatalf("unable to create stream: %s", err)
+	}
 	msg := nats.Msg{
 		Subject: "ORDERS.1",
 		Data:    []byte(testMsgData),
 	}
 
-	nc.PublishMsg(&msg)
-
 	t.Run("--dump=file", func(t *testing.T) {
+		nc.PublishMsg(&msg)
 		runNatsCli(t, fmt.Sprintf("--server='%s' sub --stream ORDERS --last --count=1 --dump=/tmp/test1", srv.ClientURL()))
 		defer os.RemoveAll("/tmp/test1/")
 
@@ -58,6 +60,7 @@ func TestSubscribe(t *testing.T) {
 	})
 
 	t.Run("--dump=-", func(t *testing.T) {
+		nc.PublishMsg(&msg)
 		output := runNatsCli(t, fmt.Sprintf("--server='%s' sub --stream ORDERS --last --count=1 --dump=-", srv.ClientURL()))
 		// We trimspace here because some shells can pre- and append whitespaces to the output
 		resp := strings.TrimSpace(strings.Split(string(output), "\n")[1])
@@ -75,6 +78,7 @@ func TestSubscribe(t *testing.T) {
 	})
 
 	t.Run("--translate", func(t *testing.T) {
+		nc.PublishMsg(&msg)
 		output := runNatsCli(t, fmt.Sprintf("--server='%s' sub --stream ORDERS --last --count=1 --raw --translate=\"wc -c\"", srv.ClientURL()))
 		// We trimspace here because some shells can pre- and append whitespaces to the output
 		resp := strings.TrimSpace(strings.Split(string(output), "\n")[1])
@@ -83,11 +87,26 @@ func TestSubscribe(t *testing.T) {
 		}
 	})
 
+	t.Run("--translate empty message", func(t *testing.T) {
+		empty := nats.Msg{
+			Subject: "ORDERS.1",
+			Data:    []byte(""),
+		}
+		nc.PublishMsg(&empty)
+		output := runNatsCli(t, fmt.Sprintf("--server='%s' sub --stream ORDERS --last --count=1 --translate=\"wc -c\"", srv.ClientURL()))
+		// We trimspace here because some shells can pre- and append whitespaces to the output
+		resp := strings.TrimSpace(strings.Split(string(output), "\n")[2])
+		if resp != "0" {
+			t.Errorf("unexpected response. Got \"%s\" expected \"%s\"", resp, "21")
+		}
+	})
+
 	t.Run("--dump and --translate", func(t *testing.T) {
+		nc.PublishMsg(&msg)
 		runNatsCli(t, fmt.Sprintf("--server='%s' sub --stream ORDERS --last --count=1 --dump=/tmp/test2 --translate=\"wc -c\"", srv.ClientURL()))
 		defer os.RemoveAll("/tmp/test2")
 
-		resp, err := os.ReadFile("/tmp/test2/1.json")
+		resp, err := os.ReadFile("/tmp/test2/5.json")
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -104,6 +123,7 @@ func TestSubscribe(t *testing.T) {
 	})
 
 	t.Run("--raw", func(t *testing.T) {
+		nc.PublishMsg(&msg)
 		output := runNatsCli(t, fmt.Sprintf("--server='%s' sub --stream ORDERS --last --count=1 --raw", srv.ClientURL()))
 		resp := strings.TrimSpace(strings.Split(string(output), "\n")[1])
 		if resp != testMsgData {
@@ -112,6 +132,7 @@ func TestSubscribe(t *testing.T) {
 	})
 
 	t.Run("--pretty", func(t *testing.T) {
+		nc.PublishMsg(&msg)
 		output := runNatsCli(t, fmt.Sprintf("--server='%s' sub --stream ORDERS --last --count=1", srv.ClientURL()))
 		pattern := `\[#\d\] Received JetStream message: stream: ORDERS seq (\d+) / subject: ORDERS.1 / time: \d\d\d\d-\d\d-\d\dT\d\d:\d\d:\d\dZ`
 		matcher := regexp.MustCompile(pattern)