Add basic controller code, initiating json rpc connection getting list of disks and memstats for now.

commands.go

@@ -4,6 +4,7 @@ import (
 	"os/user"
 
 	"github.com/minio/cli"
+	"github.com/minio/minio/pkg/controller"
 	"github.com/minio/minio/pkg/server"
 	"github.com/minio/minio/pkg/server/api"
 )
@@ -41,8 +42,11 @@ USAGE:
   minio {{.Name}}
 
 EXAMPLES:
-  1. Start in controller mode
-      $ minio {{.Name}}
+  1. Get disks from controller
+      $ minio {{.Name}} disks http://localhost:9001/rpc
+
+  2. Get memstats from controller
+      $ minio {{.Name}} mem http://localhost:9001/rpc
 
 `,
 }
@@ -79,4 +83,21 @@ func runController(c *cli.Context) {
 	if err != nil {
 		Fatalf("Unable to determine current user. Reason: %s\n", err)
 	}
+	if len(c.Args()) != 2 || c.Args().First() == "help" {
+		cli.ShowCommandHelpAndExit(c, "controller", 1) // last argument is exit code
+	}
+	switch c.Args().First() {
+	case "disks":
+		disks, err := controller.GetDisks(c.Args().Tail().First())
+		if err != nil {
+			Fatalln(err)
+		}
+		Println(disks)
+	case "mem":
+		memstats, err := controller.GetMemStats(c.Args().Tail().First())
+		if err != nil {
+			Fatalln(err)
+		}
+		Println(string(memstats))
+	}
 }