Adding admin command for retrieving cluster metadata (#865)

Author: vitarb

tools/cli/admin.go

@@ -755,6 +755,14 @@ func newAdminClusterCommands() []cli.Command {
 				AdminDescribeCluster(c)
 			},
 		},
+		{
+			Name:    "metadata",
+			Aliases: []string{"m"},
+			Usage:   "Show cluster metadata",
+			Action: func(c *cli.Context) {
+				AdminClusterMetadata(c)
+			},
+		},
 	}
 }
 

tools/cli/adminClusterCommands.go

@@ -30,6 +30,7 @@ import (
 	"github.com/fatih/color"
 	"github.com/urfave/cli"
 	enumspb "go.temporal.io/api/enums/v1"
+	"go.temporal.io/api/workflowservice/v1"
 
 	"go.temporal.io/server/api/adminservice/v1"
 )
@@ -82,3 +83,16 @@ func AdminDescribeCluster(c *cli.Context) {
 
 	prettyPrintJSONObject(response)
 }
+
+// AdminDescribeCluster is used to dump information about the cluster
+func AdminClusterMetadata(c *cli.Context) {
+	frontendClient := cFactory.FrontendClient(c)
+	ctx, cancel := newContext(c)
+	defer cancel()
+
+	info, err := frontendClient.GetClusterInfo(ctx, &workflowservice.GetClusterInfoRequest{})
+	if err != nil {
+		ErrorAndExit("Operation AdminClusterMetadata failed.", err)
+	}
+	prettyPrintJSONObject(info)
+}