cluster: display grafana URL on the top (#1819)

pkg/cluster/manager/display.go

@@ -215,6 +215,13 @@ func (m *Manager) Display(name string, opt operator.Options) error {
 		}
 	}
 
+	if m.logger.GetDisplayMode() != logprinter.DisplayModeJSON {
+		urls, exist := getGrafanaURLStr(clusterInstInfos)
+		if exist {
+			fmt.Printf("Grafana URL:        %s\n", cyan.Sprintf("%s", urls))
+		}
+	}
+
 	if m.logger.GetDisplayMode() == logprinter.DisplayModeJSON {
 		d, err := json.MarshalIndent(j, "", "  ")
 		if err != nil {
@@ -254,6 +261,19 @@ func (m *Manager) Display(name string, opt operator.Options) error {
 	return nil
 }
 
+func getGrafanaURLStr(clusterInstInfos []InstInfo) (result string, exist bool) {
+	var grafanaURLs []string
+	for _, instance := range clusterInstInfos {
+		if instance.Role == "grafana" {
+			grafanaURLs = append(grafanaURLs, fmt.Sprintf("http://%s:%d", instance.Host, instance.Port))
+		}
+	}
+	if len(grafanaURLs) == 0 {
+		return "", false
+	}
+	return strings.Join(grafanaURLs, ","), true
+}
+
 // DisplayTiKVLabels display cluster tikv labels
 func (m *Manager) DisplayTiKVLabels(name string, opt operator.Options) error {
 	if err := clusterutil.ValidateClusterNameOrError(name); err != nil {

pkg/cluster/manager/display_test.go

@@ -0,0 +1,66 @@
+// Copyright 2020 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package manager
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetGrafanaURLStr(t *testing.T) {
+	var str string
+	var exist bool
+
+	str, exist = getGrafanaURLStr([]InstInfo{
+		{
+			Role: "grafana",
+			Port: 3000,
+			Host: "127.0.0.1",
+		}, {
+			Role: "others",
+			Port: 3000,
+			Host: "127.0.0.1",
+		},
+	})
+	assert.Equal(t, exist, true)
+	assert.Equal(t, "http://127.0.0.1:3000", str)
+
+	str, exist = getGrafanaURLStr([]InstInfo{
+		{
+			Role: "grafana",
+			Port: 3000,
+			Host: "127.0.0.1",
+		}, {
+			Role: "grafana",
+			Port: 3000,
+			Host: "127.0.0.2",
+		},
+	})
+	assert.Equal(t, exist, true)
+	assert.Equal(t, "http://127.0.0.1:3000,http://127.0.0.2:3000", str)
+
+	_, exist = getGrafanaURLStr([]InstInfo{
+		{
+			Role: "others",
+			Port: 3000,
+			Host: "127.0.0.1",
+		}, {
+			Role: "others",
+			Port: 3000,
+			Host: "127.0.0.2",
+		},
+	})
+	assert.Equal(t, exist, false)
+}