Add Donut rpc service for sending changes to configuration files

commands.go

@@ -106,7 +106,7 @@ 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" {
+	if len(c.Args()) <= 2 || c.Args().First() == "help" {
 		cli.ShowCommandHelpAndExit(c, "controller", 1) // last argument is exit code
 	}
 	switch c.Args().First() {
@@ -122,5 +122,11 @@ func runController(c *cli.Context) {
 			Fatalln(err)
 		}
 		Println(string(memstats))
+	case "donut":
+		hostname, _ := os.Hostname()
+		err := controller.SetDonut(c.Args().Tail().First(), hostname, c.Args().Tail().Tail())
+		if err != nil {
+			Fatalln(err)
+		}
 	}
 }

pkg/controller/client.go

@@ -69,4 +69,31 @@ func GetMemStats(url string) ([]byte, error) {
 	return json.MarshalIndent(reply, "", "\t")
 }
 
+// SetDonut - set donut config
+func SetDonut(url, hostname string, disks []string) error {
+	op := RPCOps{
+		Method: "Donut.Set",
+		Request: rpc.DonutArgs{
+			Hostname: hostname,
+			Disks:    disks,
+			Name:     "default",
+			MaxSize:  512000000,
+		},
+	}
+	req, err := NewRequest(url, op, http.DefaultTransport)
+	if err != nil {
+		return iodine.New(err, nil)
+	}
+	resp, err := req.Do()
+	if err != nil {
+		return iodine.New(err, nil)
+	}
+	defer resp.Body.Close()
+	var reply rpc.Reply
+	if err := jsonrpc.DecodeClientResponse(resp.Body, &reply); err != nil {
+		return iodine.New(err, nil)
+	}
+	return reply.Error
+}
+
 // Add more functions here for many replies

pkg/donut/config.go

@@ -34,6 +34,7 @@ func getDonutConfigPath() (string, error) {
 	return donutConfigPath, nil
 }
 
+// NOTE - this is not to be used outside Donut package, this is primarily intended for testing purposes only
 var customConfigPath string
 
 // SaveConfig save donut config

pkg/donut/disk/disk.go

@@ -38,11 +38,6 @@ func New(diskPath string) (Disk, error) {
 	if diskPath == "" {
 		return Disk{}, iodine.New(InvalidArgument{}, nil)
 	}
-	s := syscall.Statfs_t{}
-	err := syscall.Statfs(diskPath, &s)
-	if err != nil {
-		return Disk{}, iodine.New(err, nil)
-	}
 	st, err := os.Stat(diskPath)
 	if err != nil {
 		return Disk{}, iodine.New(err, nil)
@@ -50,6 +45,11 @@ func New(diskPath string) (Disk, error) {
 	if !st.IsDir() {
 		return Disk{}, iodine.New(syscall.ENOTDIR, nil)
 	}
+	s := syscall.Statfs_t{}
+	err = syscall.Statfs(diskPath, &s)
+	if err != nil {
+		return Disk{}, iodine.New(err, nil)
+	}
 	disk := Disk{
 		path:   diskPath,
 		fsInfo: make(map[string]string),

pkg/server/api/api.go

@@ -32,7 +32,10 @@ type Minio struct {
 // New instantiate a new minio API
 func New() Minio {
 	// ignore errors for now
-	d, _ := donut.New()
+	d, err := donut.New()
+	if err != nil {
+		panic(err)
+	}
 	return Minio{
 		OP:    make(chan Operation),
 		Donut: d,

pkg/server/router.go

@@ -115,6 +115,7 @@ func getRPCHandler() http.Handler {
 	s.RegisterService(new(rpc.VersionService), "Version")
 	s.RegisterService(new(rpc.SysInfoService), "SysInfo")
 	s.RegisterService(new(rpc.DiskInfoService), "DiskInfo")
+	s.RegisterService(new(rpc.DonutService), "Donut")
 	// Add new services here
 	return registerRPC(router.NewRouter(), s)
 }

pkg/server/rpc/donut.go

@@ -16,15 +16,21 @@
 
 package rpc
 
-import "net/http"
+import (
+	"net/http"
+
+	"github.com/minio/minio/pkg/donut"
+	"github.com/minio/minio/pkg/iodine"
+)
 
 // DonutService donut service
 type DonutService struct{}
 
 // DonutArgs collections of disks and name to initialize donut
 type DonutArgs struct {
-	MaxSize int64
 	Name     string
+	MaxSize  uint64
+	Hostname string
 	Disks    []string
 }
 
@@ -34,11 +40,21 @@ type Reply struct {
 	Error   error  `json:"error"`
 }
 
-func setDonutArgs(args *DonutArgs, reply *Reply) error {
+func setDonut(args *DonutArgs, reply *Reply) error {
+	conf := &donut.Config{Version: "0.0.1"}
+	conf.DonutName = args.Name
+	conf.MaxSize = args.MaxSize
+	conf.NodeDiskMap = make(map[string][]string)
+	conf.NodeDiskMap[args.Hostname] = args.Disks
+	if err := donut.SaveConfig(conf); err != nil {
+		return iodine.New(err, nil)
+	}
+	reply.Message = "success"
+	reply.Error = nil
 	return nil
 }
 
 // Set method
 func (s *DonutService) Set(r *http.Request, args *DonutArgs, reply *Reply) error {
-	return setDonutArgs(args, reply)
+	return setDonut(args, reply)
 }