Merge remote-tracking branch 'origin/master' into HEAD

Conflicts:
	pkg/drivers/donut/donut.go
	pkg/storage/donut/bucket.go
	pkg/storage/donut/donut.go
	pkg/storage/donut/donut_test.go
	pkg/storage/donut/donutdriver.go

Godeps/Godeps.json

@@ -5,11 +5,6 @@
 		"./..."
 	],
 	"Deps": [
-		{
-			"ImportPath": "github.com/codegangsta/cli",
-			"Comment": "1.2.0-42-gfbda1ce",
-			"Rev": "fbda1ce02d5dabcee952040e5f4025753b6c9ce0"
-		},
 		{
 			"ImportPath": "github.com/gorilla/context",
 			"Rev": "50c25fb3b2b3b3cc724e9b6ac75fb44b3bccd0da"
@@ -18,6 +13,11 @@
 			"ImportPath": "github.com/gorilla/mux",
 			"Rev": "e444e69cbd2e2e3e0749a2f3c717cec491552bbf"
 		},
+		{
+			"ImportPath": "github.com/minio-io/cli",
+			"Comment": "1.2.0-96-gfcc23e2",
+			"Rev": "fcc23e23a705c0d95fce2a446c364ac31a1c73a5"
+		},
 		{
 			"ImportPath": "gopkg.in/check.v1",
 			"Rev": "64131543e7896d5bcc6bd5a76287eb75ea96c673"

Godeps/_workspace/src/github.com/minio-io/cli/README.md

@@ -210,7 +210,7 @@ Subcommands can be defined for a more git-like command line app.
 app.Commands = []cli.Command{
   {
     Name:      "add",
-    ShortName: "a",
+    Aliases:     []string{"a"},
     Usage:     "add a task to the list",
     Action: func(c *cli.Context) {
       println("added task: ", c.Args().First())
@@ -218,7 +218,7 @@ app.Commands = []cli.Command{
   },
   {
     Name:      "complete",
-    ShortName: "c",
+    Aliases:     []string{"c"},
     Usage:     "complete a task on the list",
     Action: func(c *cli.Context) {
       println("completed task: ", c.Args().First())
@@ -226,7 +226,7 @@ app.Commands = []cli.Command{
   },
   {
     Name:      "template",
-    ShortName: "r",
+    Aliases:     []string{"r"},
     Usage:     "options for task templates",
     Subcommands: []cli.Command{
       {
@@ -244,7 +244,7 @@ app.Commands = []cli.Command{
         },
       },
     },
-  },     
+  },
 }
 ...
 ```
@@ -262,8 +262,8 @@ app := cli.NewApp()
 app.EnableBashCompletion = true
 app.Commands = []cli.Command{
   {
-    Name: "complete",
-    ShortName: "c",
+    Name:  "complete",
+    Aliases: []string{"c"},
     Usage: "complete a task on the list",
     Action: func(c *cli.Context) {
        println("completed task: ", c.Args().First())
@@ -293,6 +293,6 @@ setting the `PROG` variable to the name of your program:
 ## Contribution Guidelines
 Feel free to put up a pull request to fix a bug or maybe add a feature. I will give it a code review and make sure that it does not break backwards compatibility. If I or any other collaborators agree that it is in line with the vision of the project, we will work with you to get the code into a mergeable state and merge it into the master branch.
 
-If you are have contributed something significant to the project, I will most likely add you as a collaborator. As a collaborator you are given the ability to merge others pull requests. It is very important that new code does not break existing code, so be careful about what code you do choose to merge. If you have any questions feel free to link @codegangsta to the issue in question and we can review it together.
+If you have contributed something significant to the project, I will most likely add you as a collaborator. As a collaborator you are given the ability to merge others pull requests. It is very important that new code does not break existing code, so be careful about what code you do choose to merge. If you have any questions feel free to link @codegangsta to the issue in question and we can review it together.
 
 If you feel like you have contributed to the project but have not yet been added as a collaborator, I probably forgot to add you. Hit @codegangsta up over email and we will get it figured out.

Godeps/_workspace/src/github.com/minio-io/cli/app.go

@@ -2,8 +2,12 @@ package cli
 
 import (
 	"fmt"
+	"io"
 	"io/ioutil"
 	"os"
+	"strings"
+	"text/tabwriter"
+	"text/template"
 	"time"
 )
 
@@ -31,16 +35,23 @@ type App struct {
 	// An action to execute before any subcommands are run, but after the context is ready
 	// If a non-nil error is returned, no subcommands are run
 	Before func(context *Context) error
+	// An action to execute after any subcommands are run, but after the subcommand has finished
+	// It is run even if Action() panics
+	After func(context *Context) error
 	// The action to execute when no subcommands are specified
 	Action func(context *Context)
 	// Execute this function if the proper command cannot be found
 	CommandNotFound func(context *Context, command string)
 	// Compilation date
 	Compiled time.Time
-	// Author
+	// List of all authors who contributed
+	Authors []Author
+	// Name of Author (Note: Use App.Authors, this is deprecated)
 	Author string
-	// Author e-mail
+	// Email of Author (Note: Use App.Authors, this is deprecated)
 	Email string
+	// Writer writer to write output to
+	Writer io.Writer
 }
 
 // Tries to find out when this binary was compiled.
@@ -62,15 +73,42 @@ func NewApp() *App {
 		BashComplete: DefaultAppComplete,
 		Action:       helpCommand.Action,
 		Compiled:     compileTime(),
+		Writer:       os.Stdout,
 	}
 }
 
 // Entry point to the cli app. Parses the arguments slice and routes to the proper flag/args combination
-func (a *App) Run(arguments []string) error {
+func (a *App) Run(arguments []string) (err error) {
+	if a.Author != "" || a.Email != "" {
+		a.Authors = append(a.Authors, Author{Name: a.Author, Email: a.Email})
+	}
+
+	if HelpPrinter == nil {
+		defer func() {
+			HelpPrinter = nil
+		}()
+
+		HelpPrinter = func(templ string, data interface{}) {
+			funcMap := template.FuncMap{
+				"join": strings.Join,
+			}
+
+			w := tabwriter.NewWriter(a.Writer, 0, 8, 1, '\t', 0)
+			t := template.Must(template.New("help").Funcs(funcMap).Parse(templ))
+			err := t.Execute(w, data)
+			if err != nil {
+				panic(err)
+			}
+			w.Flush()
+		}
+	}
+
 	// append help to commands
 	if a.Command(helpCommand.Name) == nil && !a.HideHelp {
 		a.Commands = append(a.Commands, helpCommand)
-		a.appendFlag(HelpFlag)
+		if (HelpFlag != BoolFlag{}) {
+			a.appendFlag(HelpFlag)
+		}
 	}
 
 	//append version/help flags
@@ -85,21 +123,21 @@ func (a *App) Run(arguments []string) error {
 	// parse flags
 	set := flagSet(a.Name, a.Flags)
 	set.SetOutput(ioutil.Discard)
-	err := set.Parse(arguments[1:])
+	err = set.Parse(arguments[1:])
 	nerr := normalizeFlags(a.Flags, set)
 	if nerr != nil {
-		fmt.Println(nerr)
+		fmt.Fprintln(a.Writer, nerr)
 		context := NewContext(a, set, set)
 		ShowAppHelp(context)
-		fmt.Println("")
+		fmt.Fprintln(a.Writer)
 		return nerr
 	}
 	context := NewContext(a, set, set)
 
 	if err != nil {
-		fmt.Printf("Incorrect Usage.\n\n")
+		fmt.Fprintf(a.Writer, "Incorrect Usage.\n\n")
 		ShowAppHelp(context)
-		fmt.Println("")
+		fmt.Fprintln(a.Writer)
 		return err
 	}
 
@@ -115,6 +153,15 @@ func (a *App) Run(arguments []string) error {
 		return nil
 	}
 
+	if a.After != nil {
+		defer func() {
+			// err is always nil here.
+			// There is a check to see if it is non-nil
+			// just few lines before.
+			err = a.After(context)
+		}()
+	}
+
 	if a.Before != nil {
 		err := a.Before(context)
 		if err != nil {
@@ -139,18 +186,20 @@ func (a *App) Run(arguments []string) error {
 // Another entry point to the cli app, takes care of passing arguments and error handling
 func (a *App) RunAndExitOnError() {
 	if err := a.Run(os.Args); err != nil {
-		os.Stderr.WriteString(fmt.Sprintln(err))
+		fmt.Fprintln(os.Stderr, err)
 		os.Exit(1)
 	}
 }
 
 // Invokes the subcommand given the context, parses ctx.Args() to generate command-specific flags
-func (a *App) RunAsSubcommand(ctx *Context) error {
+func (a *App) RunAsSubcommand(ctx *Context) (err error) {
 	// append help to commands
 	if len(a.Commands) > 0 {
 		if a.Command(helpCommand.Name) == nil && !a.HideHelp {
 			a.Commands = append(a.Commands, helpCommand)
-			a.appendFlag(HelpFlag)
+			if (HelpFlag != BoolFlag{}) {
+				a.appendFlag(HelpFlag)
+			}
 		}
 	}
 
@@ -162,23 +211,23 @@ func (a *App) RunAsSubcommand(ctx *Context) error {
 	// parse flags
 	set := flagSet(a.Name, a.Flags)
 	set.SetOutput(ioutil.Discard)
-	err := set.Parse(ctx.Args().Tail())
+	err = set.Parse(ctx.Args().Tail())
 	nerr := normalizeFlags(a.Flags, set)
 	context := NewContext(a, set, ctx.globalSet)
 
 	if nerr != nil {
-		fmt.Println(nerr)
+		fmt.Fprintln(a.Writer, nerr)
 		if len(a.Commands) > 0 {
 			ShowSubcommandHelp(context)
 		} else {
 			ShowCommandHelp(ctx, context.Args().First())
 		}
-		fmt.Println("")
+		fmt.Fprintln(a.Writer)
 		return nerr
 	}
 
 	if err != nil {
-		fmt.Printf("Incorrect Usage.\n\n")
+		fmt.Fprintf(a.Writer, "Incorrect Usage.\n\n")
 		ShowSubcommandHelp(context)
 		return err
 	}
@@ -197,6 +246,15 @@ func (a *App) RunAsSubcommand(ctx *Context) error {
 		}
 	}
 
+	if a.After != nil {
+		defer func() {
+			// err is always nil here.
+			// There is a check to see if it is non-nil
+			// just few lines before.
+			err = a.After(context)
+		}()
+	}
+
 	if a.Before != nil {
 		err := a.Before(context)
 		if err != nil {
@@ -214,11 +272,7 @@ func (a *App) RunAsSubcommand(ctx *Context) error {
 	}
 
 	// Run default Action
-	if len(a.Commands) > 0 {
-		a.Action(context)
-	} else {
-		a.Action(ctx)
-	}
+	a.Action(context)
 
 	return nil
 }
@@ -249,3 +303,19 @@ func (a *App) appendFlag(flag Flag) {
 		a.Flags = append(a.Flags, flag)
 	}
 }
+
+// Author represents someone who has contributed to a cli project.
+type Author struct {
+	Name  string // The Authors name
+	Email string // The Authors email
+}
+
+// String makes Author comply to the Stringer interface, to allow an easy print in the templating process
+func (a Author) String() string {
+	e := ""
+	if a.Email != "" {
+		e = "<" + a.Email + "> "
+	}
+
+	return fmt.Sprintf("%v %v", a.Name, e)
+}

Godeps/_workspace/src/github.com/minio-io/cli/app_test.go

@@ -1,6 +1,7 @@
 package cli_test
 
 import (
+	"flag"
 	"fmt"
 	"os"
 	"testing"
@@ -20,6 +21,9 @@ func ExampleApp() {
 	app.Action = func(c *cli.Context) {
 		fmt.Printf("Hello %v\n", c.String("name"))
 	}
+	app.Author = "Harrison"
+	app.Email = "harrison@lolwut.com"
+	app.Authors = []cli.Author{cli.Author{Name: "Oliver Allen", Email: "oliver@toyshop.com"}}
 	app.Run(os.Args)
 	// Output:
 	// Hello Jeremy
@@ -33,13 +37,13 @@ func ExampleAppSubcommand() {
 	app.Commands = []cli.Command{
 		{
 			Name:        "hello",
-			ShortName:   "hi",
+			Aliases:     []string{"hi"},
 			Usage:       "use it to see a description",
 			Description: "This is how we describe hello the function",
 			Subcommands: []cli.Command{
 				{
 					Name:        "english",
-					ShortName:   "en",
+					Aliases:     []string{"en"},
 					Usage:       "sends a greeting in english",
 					Description: "greets someone in english",
 					Flags: []cli.Flag{
@@ -74,7 +78,7 @@ func ExampleAppHelp() {
 	app.Commands = []cli.Command{
 		{
 			Name:        "describeit",
-			ShortName:   "d",
+			Aliases:     []string{"d"},
 			Usage:       "use it to see a description",
 			Description: "This is how we describe describeit the function",
 			Action: func(c *cli.Context) {
@@ -104,7 +108,7 @@ func ExampleAppBashComplete() {
 	app.Commands = []cli.Command{
 		{
 			Name:        "describeit",
-			ShortName:   "d",
+			Aliases:     []string{"d"},
 			Usage:       "use it to see a description",
 			Description: "This is how we describe describeit the function",
 			Action: func(c *cli.Context) {
@@ -158,8 +162,8 @@ var commandAppTests = []struct {
 
 func TestApp_Command(t *testing.T) {
 	app := cli.NewApp()
-	fooCommand := cli.Command{Name: "foobar", ShortName: "f"}
-	batCommand := cli.Command{Name: "batbaz", ShortName: "b"}
+	fooCommand := cli.Command{Name: "foobar", Aliases: []string{"f"}}
+	batCommand := cli.Command{Name: "batbaz", Aliases: []string{"b"}}
 	app.Commands = []cli.Command{
 		fooCommand,
 		batCommand,
@@ -192,6 +196,76 @@ func TestApp_CommandWithArgBeforeFlags(t *testing.T) {
 	expect(t, firstArg, "my-arg")
 }
 
+func TestApp_RunAsSubcommandParseFlags(t *testing.T) {
+	var context *cli.Context
+
+	a := cli.NewApp()
+	a.Commands = []cli.Command{
+		{
+			Name: "foo",
+			Action: func(c *cli.Context) {
+				context = c
+			},
+			Flags: []cli.Flag{
+				cli.StringFlag{
+					Name:  "lang",
+					Value: "english",
+					Usage: "language for the greeting",
+				},
+			},
+			Before: func(_ *cli.Context) error { return nil },
+		},
+	}
+	a.Run([]string{"", "foo", "--lang", "spanish", "abcd"})
+
+	expect(t, context.Args().Get(0), "abcd")
+	expect(t, context.String("lang"), "spanish")
+}
+
+func TestApp_CommandWithFlagBeforeTerminator(t *testing.T) {
+	var parsedOption string
+	var args []string
+
+	app := cli.NewApp()
+	command := cli.Command{
+		Name: "cmd",
+		Flags: []cli.Flag{
+			cli.StringFlag{Name: "option", Value: "", Usage: "some option"},
+		},
+		Action: func(c *cli.Context) {
+			parsedOption = c.String("option")
+			args = c.Args()
+		},
+	}
+	app.Commands = []cli.Command{command}
+
+	app.Run([]string{"", "cmd", "my-arg", "--option", "my-option", "--", "--notARealFlag"})
+
+	expect(t, parsedOption, "my-option")
+	expect(t, args[0], "my-arg")
+	expect(t, args[1], "--")
+	expect(t, args[2], "--notARealFlag")
+}
+
+func TestApp_CommandWithNoFlagBeforeTerminator(t *testing.T) {
+	var args []string
+
+	app := cli.NewApp()
+	command := cli.Command{
+		Name: "cmd",
+		Action: func(c *cli.Context) {
+			args = c.Args()
+		},
+	}
+	app.Commands = []cli.Command{command}
+
+	app.Run([]string{"", "cmd", "my-arg", "--", "notAFlagAtAll"})
+
+	expect(t, args[0], "my-arg")
+	expect(t, args[1], "--")
+	expect(t, args[2], "notAFlagAtAll")
+}
+
 func TestApp_Float64Flag(t *testing.T) {
 	var meters float64
 
@@ -265,6 +339,50 @@ func TestApp_ParseSliceFlags(t *testing.T) {
 	}
 }
 
+func TestApp_DefaultStdout(t *testing.T) {
+	app := cli.NewApp()
+
+	if app.Writer != os.Stdout {
+		t.Error("Default output writer not set.")
+	}
+}
+
+type mockWriter struct {
+	written []byte
+}
+
+func (fw *mockWriter) Write(p []byte) (n int, err error) {
+	if fw.written == nil {
+		fw.written = p
+	} else {
+		fw.written = append(fw.written, p...)
+	}
+
+	return len(p), nil
+}
+
+func (fw *mockWriter) GetWritten() (b []byte) {
+	return fw.written
+}
+
+func TestApp_SetStdout(t *testing.T) {
+	w := &mockWriter{}
+
+	app := cli.NewApp()
+	app.Name = "test"
+	app.Writer = w
+
+	err := app.Run([]string{"help"})
+
+	if err != nil {
+		t.Fatalf("Run error: %s", err)
+	}
+
+	if len(w.written) == 0 {
+		t.Error("App did not write output to desired writer.")
+	}
+}
+
 func TestApp_BeforeFunc(t *testing.T) {
 	beforeRun, subcommandRun := false, false
 	beforeError := fmt.Errorf("fail")
@@ -331,6 +449,87 @@ func TestApp_BeforeFunc(t *testing.T) {
 
 }
 
+func TestApp_AfterFunc(t *testing.T) {
+	afterRun, subcommandRun := false, false
+	afterError := fmt.Errorf("fail")
+	var err error
+
+	app := cli.NewApp()
+
+	app.After = func(c *cli.Context) error {
+		afterRun = true
+		s := c.String("opt")
+		if s == "fail" {
+			return afterError
+		}
+
+		return nil
+	}
+
+	app.Commands = []cli.Command{
+		cli.Command{
+			Name: "sub",
+			Action: func(c *cli.Context) {
+				subcommandRun = true
+			},
+		},
+	}
+
+	app.Flags = []cli.Flag{
+		cli.StringFlag{Name: "opt"},
+	}
+
+	// run with the After() func succeeding
+	err = app.Run([]string{"command", "--opt", "succeed", "sub"})
+
+	if err != nil {
+		t.Fatalf("Run error: %s", err)
+	}
+
+	if afterRun == false {
+		t.Errorf("After() not executed when expected")
+	}
+
+	if subcommandRun == false {
+		t.Errorf("Subcommand not executed when expected")
+	}
+
+	// reset
+	afterRun, subcommandRun = false, false
+
+	// run with the Before() func failing
+	err = app.Run([]string{"command", "--opt", "fail", "sub"})
+
+	// should be the same error produced by the Before func
+	if err != afterError {
+		t.Errorf("Run error expected, but not received")
+	}
+
+	if afterRun == false {
+		t.Errorf("After() not executed when expected")
+	}
+
+	if subcommandRun == false {
+		t.Errorf("Subcommand not executed when expected")
+	}
+}
+
+func TestAppNoHelpFlag(t *testing.T) {
+	oldFlag := cli.HelpFlag
+	defer func() {
+		cli.HelpFlag = oldFlag
+	}()
+
+	cli.HelpFlag = cli.BoolFlag{}
+
+	app := cli.NewApp()
+	err := app.Run([]string{"test", "-h"})
+
+	if err != flag.ErrHelp {
+		t.Errorf("expected error about missing help flag, but got: %s (%T)", err, err)
+	}
+}
+
 func TestAppHelpPrinter(t *testing.T) {
 	oldPrinter := cli.HelpPrinter
 	defer func() {

Godeps/_workspace/src/github.com/minio-io/cli/cli_test.go

@@ -12,17 +12,17 @@ func Example() {
 	app.Usage = "task list on the command line"
 	app.Commands = []cli.Command{
 		{
-			Name:      "add",
-			ShortName: "a",
-			Usage:     "add a task to the list",
+			Name:    "add",
+			Aliases: []string{"a"},
+			Usage:   "add a task to the list",
 			Action: func(c *cli.Context) {
 				println("added task: ", c.Args().First())
 			},
 		},
 		{
-			Name:      "complete",
-			ShortName: "c",
-			Usage:     "complete a task on the list",
+			Name:    "complete",
+			Aliases: []string{"c"},
+			Usage:   "complete a task on the list",
 			Action: func(c *cli.Context) {
 				println("completed task: ", c.Args().First())
 			},
@@ -38,13 +38,13 @@ func ExampleSubcommand() {
 	app.Commands = []cli.Command{
 		{
 			Name:        "hello",
-			ShortName:   "hi",
+			Aliases:     []string{"hi"},
 			Usage:       "use it to see a description",
 			Description: "This is how we describe hello the function",
 			Subcommands: []cli.Command{
 				{
 					Name:        "english",
-					ShortName:   "en",
+					Aliases:     []string{"en"},
 					Usage:       "sends a greeting in english",
 					Description: "greets someone in english",
 					Flags: []cli.Flag{
@@ -58,9 +58,9 @@ func ExampleSubcommand() {
 						println("Hello, ", c.String("name"))
 					},
 				}, {
-					Name:      "spanish",
-					ShortName: "sp",
-					Usage:     "sends a greeting in spanish",
+					Name:    "spanish",
+					Aliases: []string{"sp"},
+					Usage:   "sends a greeting in spanish",
 					Flags: []cli.Flag{
 						cli.StringFlag{
 							Name:  "surname",
@@ -72,9 +72,9 @@ func ExampleSubcommand() {
 						println("Hola, ", c.String("surname"))
 					},
 				}, {
-					Name:      "french",
-					ShortName: "fr",
-					Usage:     "sends a greeting in french",
+					Name:    "french",
+					Aliases: []string{"fr"},
+					Usage:   "sends a greeting in french",
 					Flags: []cli.Flag{
 						cli.StringFlag{
 							Name:  "nickname",

Godeps/_workspace/src/github.com/minio-io/cli/command.go

@@ -10,8 +10,10 @@ import (
 type Command struct {
 	// The name of the command
 	Name string
-	// short name of the command. Typically one character
+	// short name of the command. Typically one character (deprecated, use `Aliases`)
 	ShortName string
+	// A list of aliases for the command
+	Aliases []string
 	// A short description of the usage of this command
 	Usage string
 	// A longer explanation of how the command works
@@ -21,6 +23,9 @@ type Command struct {
 	// An action to execute before any sub-subcommands are run, but after the context is ready
 	// If a non-nil error is returned, no sub-subcommands are run
 	Before func(context *Context) error
+	// An action to execute after any subcommands are run, but after the subcommand has finished
+	// It is run even if Action() panics
+	After func(context *Context) error
 	// The function to call when this command is invoked
 	Action func(context *Context)
 	// List of child commands
@@ -36,11 +41,11 @@ type Command struct {
 // Invokes the command given the context, parses ctx.Args() to generate command-specific flags
 func (c Command) Run(ctx *Context) error {
 
-	if len(c.Subcommands) > 0 || c.Before != nil {
+	if len(c.Subcommands) > 0 || c.Before != nil || c.After != nil {
 		return c.startApp(ctx)
 	}
 
-	if !c.HideHelp {
+	if !c.HideHelp && (HelpFlag != BoolFlag{}) {
 		// append help to flags
 		c.Flags = append(
 			c.Flags,
@@ -56,36 +61,48 @@ func (c Command) Run(ctx *Context) error {
 	set.SetOutput(ioutil.Discard)
 
 	firstFlagIndex := -1
+	terminatorIndex := -1
 	for index, arg := range ctx.Args() {
-		if strings.HasPrefix(arg, "-") {
-			firstFlagIndex = index
+		if arg == "--" {
+			terminatorIndex = index
 			break
+		} else if strings.HasPrefix(arg, "-") && firstFlagIndex == -1 {
+			firstFlagIndex = index
 		}
 	}
 
 	var err error
 	if firstFlagIndex > -1 && !c.SkipFlagParsing {
 		args := ctx.Args()
-		regularArgs := args[1:firstFlagIndex]
-		flagArgs := args[firstFlagIndex:]
+		regularArgs := make([]string, len(args[1:firstFlagIndex]))
+		copy(regularArgs, args[1:firstFlagIndex])
+
+		var flagArgs []string
+		if terminatorIndex > -1 {
+			flagArgs = args[firstFlagIndex:terminatorIndex]
+			regularArgs = append(regularArgs, args[terminatorIndex:]...)
+		} else {
+			flagArgs = args[firstFlagIndex:]
+		}
+
 		err = set.Parse(append(flagArgs, regularArgs...))
 	} else {
 		err = set.Parse(ctx.Args().Tail())
 	}
 
 	if err != nil {
-		fmt.Printf("Incorrect Usage.\n\n")
+		fmt.Fprint(ctx.App.Writer, "Incorrect Usage.\n\n")
 		ShowCommandHelp(ctx, c.Name)
-		fmt.Println("")
+		fmt.Fprintln(ctx.App.Writer)
 		return err
 	}
 
 	nerr := normalizeFlags(c.Flags, set)
 	if nerr != nil {
-		fmt.Println(nerr)
-		fmt.Println("")
+		fmt.Fprintln(ctx.App.Writer, nerr)
+		fmt.Fprintln(ctx.App.Writer)
 		ShowCommandHelp(ctx, c.Name)
-		fmt.Println("")
+		fmt.Fprintln(ctx.App.Writer)
 		return nerr
 	}
 	context := NewContext(ctx.App, set, ctx.globalSet)
@@ -102,9 +119,24 @@ func (c Command) Run(ctx *Context) error {
 	return nil
 }
 
+func (c Command) Names() []string {
+	names := []string{c.Name}
+
+	if c.ShortName != "" {
+		names = append(names, c.ShortName)
+	}
+
+	return append(names, c.Aliases...)
+}
+
 // Returns true if Command.Name or Command.ShortName matches given name
 func (c Command) HasName(name string) bool {
-	return c.Name == name || c.ShortName == name
+	for _, n := range c.Names() {
+		if n == name {
+			return true
+		}
+	}
+	return false
 }
 
 func (c Command) startApp(ctx *Context) error {
@@ -134,6 +166,7 @@ func (c Command) startApp(ctx *Context) error {
 
 	// set the actions
 	app.Before = c.Before
+	app.After = c.After
 	if c.Action != nil {
 		app.Action = c.Action
 	} else {

Godeps/_workspace/src/github.com/minio-io/cli/command_test.go

@@ -17,7 +17,7 @@ func TestCommandDoNotIgnoreFlags(t *testing.T) {
 
 	command := cli.Command{
 		Name:        "test-cmd",
-		ShortName:   "tc",
+		Aliases:     []string{"tc"},
 		Usage:       "this is for testing",
 		Description: "testing",
 		Action:      func(_ *cli.Context) {},
@@ -37,7 +37,7 @@ func TestCommandIgnoreFlags(t *testing.T) {
 
 	command := cli.Command{
 		Name:            "test-cmd",
-		ShortName:       "tc",
+		Aliases:         []string{"tc"},
 		Usage:           "this is for testing",
 		Description:     "testing",
 		Action:          func(_ *cli.Context) {},

Godeps/_workspace/src/github.com/minio-io/cli/context.go

@@ -106,6 +106,11 @@ func (c *Context) GlobalGeneric(name string) interface{} {
 	return lookupGeneric(name, c.globalSet)
 }
 
+// Returns the number of flags set
+func (c *Context) NumFlags() int {
+	return c.flagSet.NFlag()
+}
+
 // Determines if the flag was actually set
 func (c *Context) IsSet(name string) bool {
 	if c.setFlags == nil {

Godeps/_workspace/src/github.com/minio-io/cli/context_test.go

@@ -97,3 +97,15 @@ func TestContext_GlobalIsSet(t *testing.T) {
 	expect(t, c.GlobalIsSet("myflagGlobalUnset"), false)
 	expect(t, c.GlobalIsSet("bogusGlobal"), false)
 }
+
+func TestContext_NumFlags(t *testing.T) {
+	set := flag.NewFlagSet("test", 0)
+	set.Bool("myflag", false, "doc")
+	set.String("otherflag", "hello world", "doc")
+	globalSet := flag.NewFlagSet("test", 0)
+	globalSet.Bool("myflagGlobal", true, "doc")
+	c := cli.NewContext(nil, set, globalSet)
+	set.Parse([]string{"--myflag", "--otherflag=foo"})
+	globalSet.Parse([]string{"--myflagGlobal"})
+	expect(t, c.NumFlags(), 2)
+}

Godeps/_workspace/src/github.com/minio-io/cli/flag.go

@@ -12,6 +12,7 @@ import (
 // This flag enables bash-completion for all commands and subcommands
 var BashCompletionFlag = BoolFlag{
 	Name: "generate-bash-completion",
+	Hide: true,
 }
 
 // This flag prints the version for the application
@@ -21,6 +22,8 @@ var VersionFlag = BoolFlag{
 }
 
 // This flag prints the help for all commands and subcommands
+// Set to the zero value (BoolFlag{}) to disable flag -- keeps subcommand
+// unless HideHelp is set to true)
 var HelpFlag = BoolFlag{
 	Name:  "help, h",
 	Usage: "show help",
@@ -34,6 +37,7 @@ type Flag interface {
 	// Apply Flag settings to the given flag set
 	Apply(*flag.FlagSet)
 	getName() string
+	isNotHidden() bool
 }
 
 func flagSet(name string, flags []Flag) *flag.FlagSet {
@@ -65,12 +69,18 @@ type GenericFlag struct {
 	Value  Generic
 	Usage  string
 	EnvVar string
+	Hide   bool
 }
 
+// String returns the string representation of the generic flag to display the
+// help text to the user (uses the String() method of the generic flag to show
+// the value)
 func (f GenericFlag) String() string {
-	return withEnvHint(f.EnvVar, fmt.Sprintf("%s%s %v\t`%v` %s", prefixFor(f.Name), f.Name, f.Value, "-"+f.Name+" option -"+f.Name+" option", f.Usage))
+	return withEnvHint(f.EnvVar, fmt.Sprintf("%s%s \"%v\"\t%v", prefixFor(f.Name), f.Name, f.Value, f.Usage))
 }
 
+// Apply takes the flagset and calls Set on the generic flag with the value
+// provided by the user for parsing by the flag
 func (f GenericFlag) Apply(set *flag.FlagSet) {
 	val := f.Value
 	if f.EnvVar != "" {
@@ -92,6 +102,10 @@ func (f GenericFlag) getName() string {
 	return f.Name
 }
 
+func (f GenericFlag) isNotHidden() bool {
+	return !f.Hide
+}
+
 type StringSlice []string
 
 func (f *StringSlice) Set(value string) error {
@@ -112,12 +126,13 @@ type StringSliceFlag struct {
 	Value  *StringSlice
 	Usage  string
 	EnvVar string
+	Hide   bool
 }
 
 func (f StringSliceFlag) String() string {
 	firstName := strings.Trim(strings.Split(f.Name, ",")[0], " ")
 	pref := prefixFor(firstName)
-	return withEnvHint(f.EnvVar, fmt.Sprintf("%s '%v'\t%v", prefixedNames(f.Name), pref+firstName+" option "+pref+firstName+" option", f.Usage))
+	return withEnvHint(f.EnvVar, fmt.Sprintf("%s [%v]\t%v", prefixedNames(f.Name), pref+firstName+" option "+pref+firstName+" option", f.Usage))
 }
 
 func (f StringSliceFlag) Apply(set *flag.FlagSet) {
@@ -145,6 +160,10 @@ func (f StringSliceFlag) getName() string {
 	return f.Name
 }
 
+func (f StringSliceFlag) isNotHidden() bool {
+	return !f.Hide
+}
+
 type IntSlice []int
 
 func (f *IntSlice) Set(value string) error {
@@ -171,12 +190,13 @@ type IntSliceFlag struct {
 	Value  *IntSlice
 	Usage  string
 	EnvVar string
+	Hide   bool
 }
 
 func (f IntSliceFlag) String() string {
 	firstName := strings.Trim(strings.Split(f.Name, ",")[0], " ")
 	pref := prefixFor(firstName)
-	return withEnvHint(f.EnvVar, fmt.Sprintf("%s '%v'\t%v", prefixedNames(f.Name), pref+firstName+" option "+pref+firstName+" option", f.Usage))
+	return withEnvHint(f.EnvVar, fmt.Sprintf("%s [%v]\t%v", prefixedNames(f.Name), pref+firstName+" option "+pref+firstName+" option", f.Usage))
 }
 
 func (f IntSliceFlag) Apply(set *flag.FlagSet) {
@@ -207,10 +227,15 @@ func (f IntSliceFlag) getName() string {
 	return f.Name
 }
 
+func (f IntSliceFlag) isNotHidden() bool {
+	return !f.Hide
+}
+
 type BoolFlag struct {
 	Name   string
 	Usage  string
 	EnvVar string
+	Hide   bool
 }
 
 func (f BoolFlag) String() string {
@@ -241,10 +266,15 @@ func (f BoolFlag) getName() string {
 	return f.Name
 }
 
+func (f BoolFlag) isNotHidden() bool {
+	return !f.Hide
+}
+
 type BoolTFlag struct {
 	Name   string
 	Usage  string
 	EnvVar string
+	Hide   bool
 }
 
 func (f BoolTFlag) String() string {
@@ -275,11 +305,16 @@ func (f BoolTFlag) getName() string {
 	return f.Name
 }
 
+func (f BoolTFlag) isNotHidden() bool {
+	return !f.Hide
+}
+
 type StringFlag struct {
 	Name   string
 	Value  string
 	Usage  string
 	EnvVar string
+	Hide   bool
 }
 
 func (f StringFlag) String() string {
@@ -287,11 +322,10 @@ func (f StringFlag) String() string {
 	fmtString = "%s %v\t%v"
 
 	if len(f.Value) > 0 {
-		fmtString = "%s '%v'\t%v"
+		fmtString = "%s \"%v\"\t%v"
 	} else {
 		fmtString = "%s %v\t%v"
 	}
-
 	return withEnvHint(f.EnvVar, fmt.Sprintf(fmtString, prefixedNames(f.Name), f.Value, f.Usage))
 }
 
@@ -315,15 +349,20 @@ func (f StringFlag) getName() string {
 	return f.Name
 }
 
+func (f StringFlag) isNotHidden() bool {
+	return !f.Hide
+}
+
 type IntFlag struct {
 	Name   string
 	Value  int
 	Usage  string
 	EnvVar string
+	Hide   bool
 }
 
 func (f IntFlag) String() string {
-	return withEnvHint(f.EnvVar, fmt.Sprintf("%s '%v'\t%v", prefixedNames(f.Name), f.Value, f.Usage))
+	return withEnvHint(f.EnvVar, fmt.Sprintf("%s \"%v\"\t%v", prefixedNames(f.Name), f.Value, f.Usage))
 }
 
 func (f IntFlag) Apply(set *flag.FlagSet) {
@@ -331,7 +370,7 @@ func (f IntFlag) Apply(set *flag.FlagSet) {
 		for _, envVar := range strings.Split(f.EnvVar, ",") {
 			envVar = strings.TrimSpace(envVar)
 			if envVal := os.Getenv(envVar); envVal != "" {
-				envValInt, err := strconv.ParseUint(envVal, 10, 64)
+				envValInt, err := strconv.ParseInt(envVal, 0, 64)
 				if err == nil {
 					f.Value = int(envValInt)
 					break
@@ -349,15 +388,20 @@ func (f IntFlag) getName() string {
 	return f.Name
 }
 
+func (f IntFlag) isNotHidden() bool {
+	return !f.Hide
+}
+
 type DurationFlag struct {
 	Name   string
 	Value  time.Duration
 	Usage  string
 	EnvVar string
+	Hide   bool
 }
 
 func (f DurationFlag) String() string {
-	return withEnvHint(f.EnvVar, fmt.Sprintf("%s '%v'\t%v", prefixedNames(f.Name), f.Value, f.Usage))
+	return withEnvHint(f.EnvVar, fmt.Sprintf("%s \"%v\"\t%v", prefixedNames(f.Name), f.Value, f.Usage))
 }
 
 func (f DurationFlag) Apply(set *flag.FlagSet) {
@@ -383,15 +427,20 @@ func (f DurationFlag) getName() string {
 	return f.Name
 }
 
+func (f DurationFlag) isNotHidden() bool {
+	return !f.Hide
+}
+
 type Float64Flag struct {
 	Name   string
 	Value  float64
 	Usage  string
 	EnvVar string
+	Hide   bool
 }
 
 func (f Float64Flag) String() string {
-	return withEnvHint(f.EnvVar, fmt.Sprintf("%s '%v'\t%v", prefixedNames(f.Name), f.Value, f.Usage))
+	return withEnvHint(f.EnvVar, fmt.Sprintf("%s \"%v\"\t%v", prefixedNames(f.Name), f.Value, f.Usage))
 }
 
 func (f Float64Flag) Apply(set *flag.FlagSet) {
@@ -416,6 +465,10 @@ func (f Float64Flag) getName() string {
 	return f.Name
 }
 
+func (f Float64Flag) isNotHidden() bool {
+	return !f.Hide
+}
+
 func prefixFor(name string) (prefix string) {
 	if len(name) == 1 {
 		prefix = "-"

Godeps/_workspace/src/github.com/minio-io/cli/flag_test.go

@@ -38,7 +38,7 @@ var stringFlagTests = []struct {
 	{"help", "", "--help \t"},
 	{"h", "", "-h \t"},
 	{"h", "", "-h \t"},
-	{"test", "Something", "--test 'Something'\t"},
+	{"test", "Something", "--test \"Something\"\t"},
 }
 
 func TestStringFlagHelpOutput(t *testing.T) {
@@ -75,22 +75,22 @@ var stringSliceFlagTests = []struct {
 		s := &cli.StringSlice{}
 		s.Set("")
 		return s
-	}(), "--help '--help option --help option'\t"},
+	}(), "--help [--help option --help option]\t"},
 	{"h", func() *cli.StringSlice {
 		s := &cli.StringSlice{}
 		s.Set("")
 		return s
-	}(), "-h '-h option -h option'\t"},
+	}(), "-h [-h option -h option]\t"},
 	{"h", func() *cli.StringSlice {
 		s := &cli.StringSlice{}
 		s.Set("")
 		return s
-	}(), "-h '-h option -h option'\t"},
+	}(), "-h [-h option -h option]\t"},
 	{"test", func() *cli.StringSlice {
 		s := &cli.StringSlice{}
 		s.Set("Something")
 		return s
-	}(), "--test '--test option --test option'\t"},
+	}(), "--test [--test option --test option]\t"},
 }
 
 func TestStringSliceFlagHelpOutput(t *testing.T) {
@@ -122,8 +122,8 @@ var intFlagTests = []struct {
 	name     string
 	expected string
 }{
-	{"help", "--help '0'\t"},
-	{"h", "-h '0'\t"},
+	{"help", "--help \"0\"\t"},
+	{"h", "-h \"0\"\t"},
 }
 
 func TestIntFlagHelpOutput(t *testing.T) {
@@ -155,8 +155,8 @@ var durationFlagTests = []struct {
 	name     string
 	expected string
 }{
-	{"help", "--help '0'\t"},
-	{"h", "-h '0'\t"},
+	{"help", "--help \"0\"\t"},
+	{"h", "-h \"0\"\t"},
 }
 
 func TestDurationFlagHelpOutput(t *testing.T) {
@@ -189,14 +189,14 @@ var intSliceFlagTests = []struct {
 	value    *cli.IntSlice
 	expected string
 }{
-	{"help", &cli.IntSlice{}, "--help '--help option --help option'\t"},
-	{"h", &cli.IntSlice{}, "-h '-h option -h option'\t"},
-	{"h", &cli.IntSlice{}, "-h '-h option -h option'\t"},
+	{"help", &cli.IntSlice{}, "--help [--help option --help option]\t"},
+	{"h", &cli.IntSlice{}, "-h [-h option -h option]\t"},
+	{"h", &cli.IntSlice{}, "-h [-h option -h option]\t"},
 	{"test", func() *cli.IntSlice {
 		i := &cli.IntSlice{}
 		i.Set("9")
 		return i
-	}(), "--test '--test option --test option'\t"},
+	}(), "--test [--test option --test option]\t"},
 }
 
 func TestIntSliceFlagHelpOutput(t *testing.T) {
@@ -228,8 +228,8 @@ var float64FlagTests = []struct {
 	name     string
 	expected string
 }{
-	{"help", "--help '0'\t"},
-	{"h", "-h '0'\t"},
+	{"help", "--help \"0\"\t"},
+	{"h", "-h \"0\"\t"},
 }
 
 func TestFloat64FlagHelpOutput(t *testing.T) {
@@ -262,15 +262,14 @@ var genericFlagTests = []struct {
 	value    cli.Generic
 	expected string
 }{
-	{"help", &Parser{}, "--help <nil>\t`-help option -help option` "},
-	{"h", &Parser{}, "-h <nil>\t`-h option -h option` "},
-	{"test", &Parser{}, "--test <nil>\t`-test option -test option` "},
+	{"test", &Parser{"abc", "def"}, "--test \"abc,def\"\ttest flag"},
+	{"t", &Parser{"abc", "def"}, "-t \"abc,def\"\ttest flag"},
 }
 
 func TestGenericFlagHelpOutput(t *testing.T) {
 
 	for _, test := range genericFlagTests {
-		flag := cli.GenericFlag{Name: test.name}
+		flag := cli.GenericFlag{Name: test.name, Value: test.value, Usage: "test flag"}
 		output := flag.String()
 
 		if output != test.expected {

Godeps/_workspace/src/github.com/minio-io/cli/help.go

@@ -1,11 +1,6 @@
 package cli
 
-import (
-	"fmt"
-	"os"
-	"text/tabwriter"
-	"text/template"
-)
+import "fmt"
 
 // The text template for the Default help topic.
 // cli.go uses text/template to render templates. You can
@@ -17,14 +12,13 @@ USAGE:
    {{.Name}} {{if .Flags}}[global options] {{end}}command{{if .Flags}} [command options]{{end}} [arguments...]
 
 VERSION:
-   {{.Version}}{{if or .Author .Email}}
+   {{.Version}}
 
-AUTHOR:{{if .Author}}
-  {{.Author}}{{if .Email}} - <{{.Email}}>{{end}}{{else}}
-  {{.Email}}{{end}}{{end}}
+AUTHOR(S):
+   {{range .Authors}}{{ . }} {{end}}
 
 COMMANDS:
-   {{range .Commands}}{{.Name}}{{with .ShortName}}, {{.}}{{end}}{{ "\t" }}{{.Usage}}
+   {{range .Commands}}{{join .Names ", "}}{{ "\t" }}{{.Usage}}
    {{end}}{{if .Flags}}
 GLOBAL OPTIONS:
    {{range .Flags}}{{.}}
@@ -58,7 +52,7 @@ USAGE:
    {{.Name}} command{{if .Flags}} [command options]{{end}} [arguments...]
 
 COMMANDS:
-   {{range .Commands}}{{.Name}}{{with .ShortName}}, {{.}}{{end}}{{ "\t" }}{{.Usage}}
+   {{range .Commands}}{{join .Names ", "}}{{ "\t" }}{{.Usage}}
    {{end}}{{if .Flags}}
 OPTIONS:
    {{range .Flags}}{{.}}
@@ -66,9 +60,9 @@ OPTIONS:
 `
 
 var helpCommand = Command{
-	Name:      "help",
-	ShortName: "h",
-	Usage:     "Shows a list of commands or help for one command",
+	Name:    "help",
+	Aliases: []string{"h"},
+	Usage:   "Shows a list of commands or help for one command",
 	Action: func(c *Context) {
 		args := c.Args()
 		if args.Present() {
@@ -80,9 +74,9 @@ var helpCommand = Command{
 }
 
 var helpSubcommand = Command{
-	Name:      "help",
-	ShortName: "h",
-	Usage:     "Shows a list of commands or help for one command",
+	Name:    "help",
+	Aliases: []string{"h"},
+	Usage:   "Shows a list of commands or help for one command",
 	Action: func(c *Context) {
 		args := c.Args()
 		if args.Present() {
@@ -94,30 +88,61 @@ var helpSubcommand = Command{
 }
 
 // Prints help for the App
-var HelpPrinter = printHelp
+type helpPrinter func(templ string, data interface{})
+
+var HelpPrinter helpPrinter = nil
 
 // Prints version for the App
 var VersionPrinter = printVersion
 
 func ShowAppHelp(c *Context) {
-	HelpPrinter(AppHelpTemplate, c.App)
+	// Make a copy of c.App context
+	app := *c.App
+	app.Flags = make([]Flag, 0)
+	for _, flag := range c.App.Flags {
+		if flag.isNotHidden() {
+			app.Flags = append(app.Flags, flag)
+		}
+	}
+	HelpPrinter(AppHelpTemplate, app)
 }
 
 // Prints the list of subcommands as the default app completion method
 func DefaultAppComplete(c *Context) {
 	for _, command := range c.App.Commands {
-		fmt.Println(command.Name)
-		if command.ShortName != "" {
-			fmt.Println(command.ShortName)
+		for _, name := range command.Names() {
+			fmt.Fprintln(c.App.Writer, name)
 		}
 	}
 }
 
 // Prints help for the given command
 func ShowCommandHelp(c *Context, command string) {
+	// show the subcommand help for a command with subcommands
+	if command == "" {
+		// Make a copy of c.App context
+		app := *c.App
+		app.Flags = make([]Flag, 0)
+		for _, flag := range c.App.Flags {
+			if flag.isNotHidden() {
+				app.Flags = append(app.Flags, flag)
+			}
+		}
+		HelpPrinter(SubcommandHelpTemplate, app)
+		return
+	}
+
 	for _, c := range c.App.Commands {
 		if c.HasName(command) {
-			HelpPrinter(CommandHelpTemplate, c)
+			// Make a copy of command context
+			c0 := c
+			c0.Flags = make([]Flag, 0)
+			for _, flag := range c.Flags {
+				if flag.isNotHidden() {
+					c0.Flags = append(c0.Flags, flag)
+				}
+			}
+			HelpPrinter(CommandHelpTemplate, c0)
 			return
 		}
 	}
@@ -125,13 +150,13 @@ func ShowCommandHelp(c *Context, command string) {
 	if c.App.CommandNotFound != nil {
 		c.App.CommandNotFound(c, command)
 	} else {
-		fmt.Printf("No help topic for '%v'\n", command)
+		fmt.Fprintf(c.App.Writer, "No help topic for '%v'\n", command)
 	}
 }
 
 // Prints help for the given subcommand
 func ShowSubcommandHelp(c *Context) {
-	HelpPrinter(SubcommandHelpTemplate, c.App)
+	ShowCommandHelp(c, c.Command.Name)
 }
 
 // Prints the version number of the App
@@ -140,7 +165,7 @@ func ShowVersion(c *Context) {
 }
 
 func printVersion(c *Context) {
-	fmt.Printf("%v version %v\n", c.App.Name, c.App.Version)
+	fmt.Fprintf(c.App.Writer, "%v version %v\n", c.App.Name, c.App.Version)
 }
 
 // Prints the lists of commands within a given context
@@ -159,16 +184,6 @@ func ShowCommandCompletions(ctx *Context, command string) {
 	}
 }
 
-func printHelp(templ string, data interface{}) {
-	w := tabwriter.NewWriter(os.Stdout, 0, 8, 1, '\t', 0)
-	t := template.Must(template.New("help").Parse(templ))
-	err := t.Execute(w, data)
-	if err != nil {
-		panic(err)
-	}
-	w.Flush()
-}
-
 func checkVersion(c *Context) bool {
 	if c.GlobalBool("version") {
 		ShowVersion(c)

main.go

@@ -19,12 +19,47 @@ package main
 import (
 	"os"
 
-	"github.com/codegangsta/cli"
+	"github.com/minio-io/cli"
 	"github.com/minio-io/minio/pkg/server"
 	"github.com/minio-io/minio/pkg/utils/log"
 )
 
-func getStorageType(input string) server.StorageType {
+var flags = []cli.Flag{
+	cli.StringFlag{
+		Name:  "domain,d",
+		Value: "",
+		Usage: "domain used for routing incoming API requests",
+	},
+	cli.StringFlag{
+		Name:  "api-address,a",
+		Value: ":9000",
+		Usage: "address for incoming API requests",
+	},
+	cli.StringFlag{
+		Name:  "web-address,w",
+		Value: ":9001",
+		Usage: "address for incoming Management UI requests",
+	},
+	cli.StringFlag{
+		Name:  "cert,c",
+		Hide:  true,
+		Value: "",
+		Usage: "cert.pem",
+	},
+	cli.StringFlag{
+		Name:  "key,k",
+		Hide:  true,
+		Value: "",
+		Usage: "key.pem",
+	},
+	cli.StringFlag{
+		Name:  "driver-type,t",
+		Value: "donut",
+		Usage: "valid entries: file,inmemory,donut",
+	},
+}
+
+func getDriverType(input string) server.DriverType {
 	switch {
 	case input == "file":
 		return server.File
@@ -34,15 +69,15 @@ func getStorageType(input string) server.StorageType {
 		return server.Donut
 	default:
 		{
-			log.Println("Unknown storage type:", input)
-			log.Println("Choosing default storage type as 'file'..")
+			log.Println("Unknown driver type:", input)
+			log.Println("Choosing default driver type as 'file'..")
 			return server.File
 		}
 	}
 }
 
 func runCmd(c *cli.Context) {
-	storageTypeStr := c.String("storage-type")
+	driverTypeStr := c.String("driver-type")
 	domain := c.String("domain")
 	apiaddress := c.String("api-address")
 	webaddress := c.String("web-address")
@@ -52,7 +87,7 @@ func runCmd(c *cli.Context) {
 		log.Fatal("Both certificate and key must be provided to enable https")
 	}
 	tls := (certFile != "" && keyFile != "")
-	storageType := getStorageType(storageTypeStr)
+	driverType := getDriverType(driverTypeStr)
 	var serverConfigs []server.Config
 	apiServerConfig := server.Config{
 		Domain:   domain,
@@ -61,7 +96,7 @@ func runCmd(c *cli.Context) {
 		CertFile: certFile,
 		KeyFile:  keyFile,
 		APIType: server.MinioAPI{
-			StorageType: storageType,
+			DriverType: driverType,
 		},
 	}
 	webUIServerConfig := server.Config{
@@ -82,39 +117,11 @@ func runCmd(c *cli.Context) {
 func main() {
 	app := cli.NewApp()
 	app.Name = "minio"
-	app.Usage = ""
-	app.Flags = []cli.Flag{
-		cli.StringFlag{
-			Name:  "domain,d",
-			Value: "",
-			Usage: "domain used for routing incoming API requests",
-		},
-		cli.StringFlag{
-			Name:  "api-address,a",
-			Value: ":9000",
-			Usage: "address for incoming API requests",
-		},
-		cli.StringFlag{
-			Name:  "web-address,w",
-			Value: ":9001",
-			Usage: "address for incoming Management UI requests",
-		},
-		cli.StringFlag{
-			Name:  "cert,c",
-			Value: "",
-			Usage: "cert.pem",
-		},
-		cli.StringFlag{
-			Name:  "key,k",
-			Value: "",
-			Usage: "key.pem",
-		},
-		cli.StringFlag{
-			Name:  "storage-type,s",
-			Value: "donut",
-			Usage: "valid entries: file,inmemory,donut",
-		},
-	}
+	app.Version = "0.1.0"
+	app.Author = "Minio.io"
+	app.Usage = "Minimalist Object Storage"
+	app.EnableBashCompletion = true
+	app.Flags = flags
 	app.Action = runCmd
 	app.Run(os.Args)
 }

pkg/api/api_bucket_handlers.go

@@ -20,7 +20,7 @@ import (
 	"net/http"
 
 	"github.com/gorilla/mux"
-	mstorage "github.com/minio-io/minio/pkg/storage"
+	"github.com/minio-io/minio/pkg/drivers"
 	"github.com/minio-io/minio/pkg/utils/log"
 )
 
@@ -45,21 +45,21 @@ func (server *minioAPI) listObjectsHandler(w http.ResponseWriter, req *http.Requ
 	}
 
 	acceptsContentType := getContentType(req)
-	objects, resources, err := server.storage.ListObjects(bucket, resources)
+	objects, resources, err := server.driver.ListObjects(bucket, resources)
 	switch err := err.(type) {
 	case nil: // success
 		{
 			response := generateObjectsListResult(bucket, objects, resources)
 			w.Write(writeObjectHeadersAndResponse(w, response, acceptsContentType))
 		}
-	case mstorage.BucketNotFound:
+	case drivers.BucketNotFound:
 		{
 			error := errorCodeError(NoSuchBucket)
 			errorResponse := getErrorResponse(error, bucket)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.ImplementationError:
+	case drivers.ImplementationError:
 		{
 			// Embed error log on server side
 			log.Errorln(err)
@@ -68,14 +68,14 @@ func (server *minioAPI) listObjectsHandler(w http.ResponseWriter, req *http.Requ
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.BucketNameInvalid:
+	case drivers.BucketNameInvalid:
 		{
 			error := errorCodeError(InvalidBucketName)
 			errorResponse := getErrorResponse(error, bucket)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.ObjectNameInvalid:
+	case drivers.ObjectNameInvalid:
 		{
 			error := errorCodeError(NoSuchKey)
 			errorResponse := getErrorResponse(error, resources.Prefix)
@@ -91,14 +91,14 @@ func (server *minioAPI) listObjectsHandler(w http.ResponseWriter, req *http.Requ
 // owned by the authenticated sender of the request.
 func (server *minioAPI) listBucketsHandler(w http.ResponseWriter, req *http.Request) {
 	acceptsContentType := getContentType(req)
-	buckets, err := server.storage.ListBuckets()
+	buckets, err := server.driver.ListBuckets()
 	switch err := err.(type) {
 	case nil:
 		{
 			response := generateBucketsListResult(buckets)
 			w.Write(writeObjectHeadersAndResponse(w, response, acceptsContentType))
 		}
-	case mstorage.ImplementationError:
+	case drivers.ImplementationError:
 		{
 			log.Errorln(err)
 			error := errorCodeError(InternalError)
@@ -106,7 +106,7 @@ func (server *minioAPI) listBucketsHandler(w http.ResponseWriter, req *http.Requ
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.BackendCorrupted:
+	case drivers.BackendCorrupted:
 		{
 			log.Errorln(err)
 			error := errorCodeError(InternalError)
@@ -123,7 +123,7 @@ func (server *minioAPI) listBucketsHandler(w http.ResponseWriter, req *http.Requ
 func (server *minioAPI) putBucketHandler(w http.ResponseWriter, req *http.Request) {
 	vars := mux.Vars(req)
 	bucket := vars["bucket"]
-	err := server.storage.CreateBucket(bucket)
+	err := server.driver.CreateBucket(bucket)
 
 	resources := getBucketResources(req.URL.Query())
 	if resources.Policy == true {
@@ -138,21 +138,21 @@ func (server *minioAPI) putBucketHandler(w http.ResponseWriter, req *http.Reques
 			w.Header().Set("Server", "Minio")
 			w.Header().Set("Connection", "close")
 		}
-	case mstorage.BucketNameInvalid:
+	case drivers.BucketNameInvalid:
 		{
 			error := errorCodeError(InvalidBucketName)
 			errorResponse := getErrorResponse(error, bucket)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.BucketExists:
+	case drivers.BucketExists:
 		{
 			error := errorCodeError(BucketAlreadyExists)
 			errorResponse := getErrorResponse(error, bucket)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.ImplementationError:
+	case drivers.ImplementationError:
 		{
 			// Embed errors log on server side
 			log.Errorln(err)

pkg/api/api_object_handlers.go

@@ -20,7 +20,7 @@ import (
 	"net/http"
 
 	"github.com/gorilla/mux"
-	mstorage "github.com/minio-io/minio/pkg/storage"
+	"github.com/minio-io/minio/pkg/drivers"
 	"github.com/minio-io/minio/pkg/utils/log"
 )
 
@@ -35,7 +35,7 @@ func (server *minioAPI) getObjectHandler(w http.ResponseWriter, req *http.Reques
 	bucket = vars["bucket"]
 	object = vars["object"]
 
-	metadata, err := server.storage.GetObjectMetadata(bucket, object, "")
+	metadata, err := server.driver.GetObjectMetadata(bucket, object, "")
 	switch err := err.(type) {
 	case nil: // success
 		{
@@ -52,7 +52,7 @@ func (server *minioAPI) getObjectHandler(w http.ResponseWriter, req *http.Reques
 			switch httpRange.start == 0 && httpRange.length == 0 {
 			case true:
 				writeObjectHeaders(w, metadata)
-				if _, err := server.storage.GetObject(w, bucket, object); err != nil {
+				if _, err := server.driver.GetObject(w, bucket, object); err != nil {
 					log.Errorln(err)
 					error := errorCodeError(InternalError)
 					errorResponse := getErrorResponse(error, "/"+bucket+"/"+object)
@@ -64,7 +64,7 @@ func (server *minioAPI) getObjectHandler(w http.ResponseWriter, req *http.Reques
 				metadata.Size = httpRange.length
 				writeRangeObjectHeaders(w, metadata, httpRange.getContentRange())
 				w.WriteHeader(http.StatusPartialContent)
-				_, err := server.storage.GetPartialObject(w, bucket, object, httpRange.start, httpRange.length)
+				_, err := server.driver.GetPartialObject(w, bucket, object, httpRange.start, httpRange.length)
 				if err != nil {
 					log.Errorln(err)
 					error := errorCodeError(InternalError)
@@ -76,28 +76,28 @@ func (server *minioAPI) getObjectHandler(w http.ResponseWriter, req *http.Reques
 
 			}
 		}
-	case mstorage.ObjectNotFound:
+	case drivers.ObjectNotFound:
 		{
 			error := errorCodeError(NoSuchKey)
 			errorResponse := getErrorResponse(error, "/"+bucket+"/"+object)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.ObjectNameInvalid:
+	case drivers.ObjectNameInvalid:
 		{
 			error := errorCodeError(NoSuchKey)
 			errorResponse := getErrorResponse(error, "/"+bucket+"/"+object)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.BucketNameInvalid:
+	case drivers.BucketNameInvalid:
 		{
 			error := errorCodeError(InvalidBucketName)
 			errorResponse := getErrorResponse(error, "/"+bucket+"/"+object)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.ImplementationError:
+	case drivers.ImplementationError:
 		{
 			// Embed errors log on serve side
 			log.Errorln(err)
@@ -119,25 +119,25 @@ func (server *minioAPI) headObjectHandler(w http.ResponseWriter, req *http.Reque
 	bucket = vars["bucket"]
 	object = vars["object"]
 
-	metadata, err := server.storage.GetObjectMetadata(bucket, object, "")
+	metadata, err := server.driver.GetObjectMetadata(bucket, object, "")
 	switch err := err.(type) {
 	case nil:
 		writeObjectHeaders(w, metadata)
-	case mstorage.ObjectNotFound:
+	case drivers.ObjectNotFound:
 		{
 			error := errorCodeError(NoSuchKey)
 			errorResponse := getErrorResponse(error, "/"+bucket+"/"+object)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.ObjectNameInvalid:
+	case drivers.ObjectNameInvalid:
 		{
 			error := errorCodeError(NoSuchKey)
 			errorResponse := getErrorResponse(error, "/"+bucket+"/"+object)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.ImplementationError:
+	case drivers.ImplementationError:
 		{
 			// Embed error log on server side
 			log.Errorln(err)
@@ -167,12 +167,12 @@ func (server *minioAPI) putObjectHandler(w http.ResponseWriter, req *http.Reques
 
 	// get Content-MD5 sent by client
 	md5 := req.Header.Get("Content-MD5")
-	err := server.storage.CreateObject(bucket, object, "", md5, req.Body)
+	err := server.driver.CreateObject(bucket, object, "", md5, req.Body)
 	switch err := err.(type) {
 	case nil:
 		w.Header().Set("Server", "Minio")
 		w.Header().Set("Connection", "close")
-	case mstorage.ImplementationError:
+	case drivers.ImplementationError:
 		{
 			// Embed error log on server side
 			log.Errorln(err)
@@ -181,35 +181,35 @@ func (server *minioAPI) putObjectHandler(w http.ResponseWriter, req *http.Reques
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.BucketNotFound:
+	case drivers.BucketNotFound:
 		{
 			error := errorCodeError(NoSuchBucket)
 			errorResponse := getErrorResponse(error, "/"+bucket+"/"+object)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.BucketNameInvalid:
+	case drivers.BucketNameInvalid:
 		{
 			error := errorCodeError(InvalidBucketName)
 			errorResponse := getErrorResponse(error, "/"+bucket+"/"+object)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.ObjectExists:
+	case drivers.ObjectExists:
 		{
 			error := errorCodeError(NotImplemented)
 			errorResponse := getErrorResponse(error, "/"+bucket+"/"+object)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.BadDigest:
+	case drivers.BadDigest:
 		{
 			error := errorCodeError(BadDigest)
 			errorResponse := getErrorResponse(error, "/"+bucket+"/"+object)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.InvalidDigest:
+	case drivers.InvalidDigest:
 		{
 			error := errorCodeError(InvalidDigest)
 			errorResponse := getErrorResponse(error, "/"+bucket+"/"+object)

pkg/api/api_policy_handlers.go

@@ -21,7 +21,7 @@ import (
 	"net/http"
 
 	"github.com/gorilla/mux"
-	mstorage "github.com/minio-io/minio/pkg/storage"
+	"github.com/minio-io/minio/pkg/drivers"
 	"github.com/minio-io/minio/pkg/utils/log"
 )
 
@@ -34,7 +34,7 @@ func (server *minioAPI) putBucketPolicyHandler(w http.ResponseWriter, req *http.
 	bucket := vars["bucket"]
 	acceptsContentType := getContentType(req)
 
-	policy, ok := mstorage.Parsepolicy(req.Body)
+	policy, ok := drivers.Parsepolicy(req.Body)
 	if ok == false {
 		error := errorCodeError(InvalidPolicyDocument)
 		errorResponse := getErrorResponse(error, bucket)
@@ -43,7 +43,7 @@ func (server *minioAPI) putBucketPolicyHandler(w http.ResponseWriter, req *http.
 		return
 	}
 
-	err := server.storage.CreateBucketPolicy(bucket, policy)
+	err := server.driver.CreateBucketPolicy(bucket, policy)
 	switch err := err.(type) {
 	case nil:
 		{
@@ -51,21 +51,21 @@ func (server *minioAPI) putBucketPolicyHandler(w http.ResponseWriter, req *http.
 			writeCommonHeaders(w, getContentString(acceptsContentType))
 			w.Header().Set("Connection", "keep-alive")
 		}
-	case mstorage.BucketNameInvalid:
+	case drivers.BucketNameInvalid:
 		{
 			error := errorCodeError(InvalidBucketName)
 			errorResponse := getErrorResponse(error, bucket)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.BucketNotFound:
+	case drivers.BucketNotFound:
 		{
 			error := errorCodeError(NoSuchBucket)
 			errorResponse := getErrorResponse(error, bucket)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.BackendCorrupted:
+	case drivers.BackendCorrupted:
 		{
 			log.Errorln(err)
 			error := errorCodeError(InternalError)
@@ -73,7 +73,7 @@ func (server *minioAPI) putBucketPolicyHandler(w http.ResponseWriter, req *http.
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.ImplementationError:
+	case drivers.ImplementationError:
 		{
 			log.Errorln(err)
 			error := errorCodeError(InternalError)
@@ -93,7 +93,7 @@ func (server *minioAPI) getBucketPolicyHandler(w http.ResponseWriter, req *http.
 	bucket := vars["bucket"]
 	acceptsContentType := getContentType(req)
 
-	p, err := server.storage.GetBucketPolicy(bucket)
+	p, err := server.driver.GetBucketPolicy(bucket)
 	switch err := err.(type) {
 	case nil:
 		{
@@ -108,28 +108,28 @@ func (server *minioAPI) getBucketPolicyHandler(w http.ResponseWriter, req *http.
 			w.Header().Set("Connection", "keep-alive")
 			w.Write(responsePolicy)
 		}
-	case mstorage.BucketNameInvalid:
+	case drivers.BucketNameInvalid:
 		{
 			error := errorCodeError(InvalidBucketName)
 			errorResponse := getErrorResponse(error, bucket)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.BucketNotFound:
+	case drivers.BucketNotFound:
 		{
 			error := errorCodeError(NoSuchBucket)
 			errorResponse := getErrorResponse(error, bucket)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.BucketPolicyNotFound:
+	case drivers.BucketPolicyNotFound:
 		{
 			error := errorCodeError(NoSuchBucketPolicy)
 			errorResponse := getErrorResponse(error, bucket)
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.BackendCorrupted:
+	case drivers.BackendCorrupted:
 		{
 			log.Errorln(err)
 			error := errorCodeError(InternalError)
@@ -137,7 +137,7 @@ func (server *minioAPI) getBucketPolicyHandler(w http.ResponseWriter, req *http.
 			w.WriteHeader(error.HTTPStatusCode)
 			w.Write(writeErrorResponse(w, errorResponse, acceptsContentType))
 		}
-	case mstorage.ImplementationError:
+	case drivers.ImplementationError:
 		{
 			log.Errorln(err)
 			error := errorCodeError(InternalError)

pkg/api/api_response.go

@@ -19,7 +19,7 @@ package api
 import (
 	"sort"
 
-	mstorage "github.com/minio-io/minio/pkg/storage"
+	"github.com/minio-io/minio/pkg/drivers"
 )
 
 // Reply date format
@@ -33,7 +33,7 @@ const (
 //
 // output:
 // populated struct that can be serialized to match xml and json api spec output
-func generateBucketsListResult(buckets []mstorage.BucketMetadata) BucketListResponse {
+func generateBucketsListResult(buckets []drivers.BucketMetadata) BucketListResponse {
 	var listbuckets []*Bucket
 	var data = BucketListResponse{}
 	var owner = Owner{}
@@ -73,7 +73,7 @@ func (b itemKey) Less(i, j int) bool { return b[i].Key < b[j].Key }
 //
 // output:
 // populated struct that can be serialized to match xml and json api spec output
-func generateObjectsListResult(bucket string, objects []mstorage.ObjectMetadata, bucketResources mstorage.BucketResourcesMetadata) ObjectListResponse {
+func generateObjectsListResult(bucket string, objects []drivers.ObjectMetadata, bucketResources drivers.BucketResourcesMetadata) ObjectListResponse {
 	var contents []*Item
 	var prefixes []*Prefix
 	var owner = Owner{}

pkg/api/api_router.go

@@ -22,13 +22,13 @@ import (
 
 	router "github.com/gorilla/mux"
 	"github.com/minio-io/minio/pkg/api/config"
-	mstorage "github.com/minio-io/minio/pkg/storage"
+	"github.com/minio-io/minio/pkg/drivers"
 )
 
 // private use
 type minioAPI struct {
-	domain  string
-	storage mstorage.Storage
+	domain string
+	driver drivers.Driver
 }
 
 // Path based routing
@@ -72,10 +72,10 @@ func getMux(api minioAPI, mux *router.Router) *router.Router {
 }
 
 // HTTPHandler - http wrapper handler
-func HTTPHandler(domain string, storage mstorage.Storage) http.Handler {
+func HTTPHandler(domain string, driver drivers.Driver) http.Handler {
 	var mux *router.Router
 	var api = minioAPI{}
-	api.storage = storage
+	api.driver = driver
 	api.domain = domain
 
 	r := router.NewRouter()

pkg/api/api_test.go

@@ -29,8 +29,8 @@ import (
 	"time"
 
 	"github.com/minio-io/minio/pkg/api"
-	mstorage "github.com/minio-io/minio/pkg/storage"
-	"github.com/minio-io/minio/pkg/storage/memory"
+	"github.com/minio-io/minio/pkg/drivers"
+	"github.com/minio-io/minio/pkg/drivers/memory"
 
 	. "gopkg.in/check.v1"
 )
@@ -42,8 +42,8 @@ type MySuite struct{}
 var _ = Suite(&MySuite{})
 
 func (s *MySuite) TestNonExistantObject(c *C) {
-	_, _, storage := memory.Start()
-	httpHandler := api.HTTPHandler("", storage)
+	_, _, driver := memory.Start()
+	httpHandler := api.HTTPHandler("", driver)
 	testServer := httptest.NewServer(httpHandler)
 	defer testServer.Close()
 
@@ -54,14 +54,14 @@ func (s *MySuite) TestNonExistantObject(c *C) {
 }
 
 func (s *MySuite) TestEmptyObject(c *C) {
-	_, _, storage := memory.Start()
-	httpHandler := api.HTTPHandler("", storage)
+	_, _, driver := memory.Start()
+	httpHandler := api.HTTPHandler("", driver)
 	testServer := httptest.NewServer(httpHandler)
 	defer testServer.Close()
 
 	buffer := bytes.NewBufferString("")
-	storage.CreateBucket("bucket")
-	storage.CreateObject("bucket", "object", "", "", buffer)
+	driver.CreateBucket("bucket")
+	driver.CreateObject("bucket", "object", "", "", buffer)
 
 	response, err := http.Get(testServer.URL + "/bucket/object")
 	c.Assert(err, IsNil)
@@ -71,7 +71,7 @@ func (s *MySuite) TestEmptyObject(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(true, Equals, bytes.Equal(responseBody, buffer.Bytes()))
 
-	metadata, err := storage.GetObjectMetadata("bucket", "object", "")
+	metadata, err := driver.GetObjectMetadata("bucket", "object", "")
 	c.Assert(err, IsNil)
 	verifyHeaders(c, response.Header, metadata.Created, 0, "application/octet-stream", metadata.Md5)
 
@@ -79,14 +79,14 @@ func (s *MySuite) TestEmptyObject(c *C) {
 }
 
 func (s *MySuite) TestObject(c *C) {
-	_, _, storage := memory.Start()
-	httpHandler := api.HTTPHandler("", storage)
+	_, _, driver := memory.Start()
+	httpHandler := api.HTTPHandler("", driver)
 	testServer := httptest.NewServer(httpHandler)
 	defer testServer.Close()
 
 	buffer := bytes.NewBufferString("hello world")
-	storage.CreateBucket("bucket")
-	storage.CreateObject("bucket", "object", "", "", buffer)
+	driver.CreateBucket("bucket")
+	driver.CreateObject("bucket", "object", "", "", buffer)
 
 	response, err := http.Get(testServer.URL + "/bucket/object")
 	c.Assert(err, IsNil)
@@ -96,14 +96,14 @@ func (s *MySuite) TestObject(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(true, Equals, bytes.Equal(responseBody, []byte("hello world")))
 
-	metadata, err := storage.GetObjectMetadata("bucket", "object", "")
+	metadata, err := driver.GetObjectMetadata("bucket", "object", "")
 	c.Assert(err, IsNil)
 	verifyHeaders(c, response.Header, metadata.Created, len("hello world"), "application/octet-stream", metadata.Md5)
 }
 
 func (s *MySuite) TestMultipleObjects(c *C) {
-	_, _, storage := memory.Start()
-	httpHandler := api.HTTPHandler("", storage)
+	_, _, driver := memory.Start()
+	httpHandler := api.HTTPHandler("", driver)
 	testServer := httptest.NewServer(httpHandler)
 	defer testServer.Close()
 
@@ -111,10 +111,10 @@ func (s *MySuite) TestMultipleObjects(c *C) {
 	buffer2 := bytes.NewBufferString("hello two")
 	buffer3 := bytes.NewBufferString("hello three")
 
-	storage.CreateBucket("bucket")
-	storage.CreateObject("bucket", "object1", "", "", buffer1)
-	storage.CreateObject("bucket", "object2", "", "", buffer2)
-	storage.CreateObject("bucket", "object3", "", "", buffer3)
+	driver.CreateBucket("bucket")
+	driver.CreateObject("bucket", "object1", "", "", buffer1)
+	driver.CreateObject("bucket", "object2", "", "", buffer2)
+	driver.CreateObject("bucket", "object3", "", "", buffer3)
 
 	// test non-existant object
 	response, err := http.Get(testServer.URL + "/bucket/object")
@@ -129,7 +129,7 @@ func (s *MySuite) TestMultipleObjects(c *C) {
 	c.Assert(err, IsNil)
 
 	// get metadata
-	metadata, err := storage.GetObjectMetadata("bucket", "object1", "")
+	metadata, err := driver.GetObjectMetadata("bucket", "object1", "")
 	c.Assert(err, IsNil)
 	c.Assert(response.StatusCode, Equals, http.StatusOK)
 
@@ -148,7 +148,7 @@ func (s *MySuite) TestMultipleObjects(c *C) {
 	c.Assert(err, IsNil)
 
 	// get metadata
-	metadata, err = storage.GetObjectMetadata("bucket", "object2", "")
+	metadata, err = driver.GetObjectMetadata("bucket", "object2", "")
 	c.Assert(err, IsNil)
 	c.Assert(response.StatusCode, Equals, http.StatusOK)
 
@@ -167,7 +167,7 @@ func (s *MySuite) TestMultipleObjects(c *C) {
 	c.Assert(err, IsNil)
 
 	// get metadata
-	metadata, err = storage.GetObjectMetadata("bucket", "object3", "")
+	metadata, err = driver.GetObjectMetadata("bucket", "object3", "")
 	c.Assert(err, IsNil)
 	c.Assert(response.StatusCode, Equals, http.StatusOK)
 
@@ -182,8 +182,8 @@ func (s *MySuite) TestMultipleObjects(c *C) {
 }
 
 func (s *MySuite) TestNotImplemented(c *C) {
-	_, _, storage := memory.Start()
-	httpHandler := api.HTTPHandler("", storage)
+	_, _, driver := memory.Start()
+	httpHandler := api.HTTPHandler("", driver)
 	testServer := httptest.NewServer(httpHandler)
 	defer testServer.Close()
 
@@ -193,8 +193,8 @@ func (s *MySuite) TestNotImplemented(c *C) {
 }
 
 func (s *MySuite) TestHeader(c *C) {
-	_, _, storage := memory.Start()
-	httpHandler := api.HTTPHandler("", storage)
+	_, _, driver := memory.Start()
+	httpHandler := api.HTTPHandler("", driver)
 	testServer := httptest.NewServer(httpHandler)
 	defer testServer.Close()
 
@@ -203,25 +203,25 @@ func (s *MySuite) TestHeader(c *C) {
 	c.Assert(response.StatusCode, Equals, http.StatusNotFound)
 
 	buffer := bytes.NewBufferString("hello world")
-	storage.CreateBucket("bucket")
-	storage.CreateObject("bucket", "object", "", "", buffer)
+	driver.CreateBucket("bucket")
+	driver.CreateObject("bucket", "object", "", "", buffer)
 
 	response, err = http.Get(testServer.URL + "/bucket/object")
 	c.Assert(err, IsNil)
 	c.Assert(response.StatusCode, Equals, http.StatusOK)
 
-	metadata, err := storage.GetObjectMetadata("bucket", "object", "")
+	metadata, err := driver.GetObjectMetadata("bucket", "object", "")
 	c.Assert(err, IsNil)
 	verifyHeaders(c, response.Header, metadata.Created, len("hello world"), "application/octet-stream", metadata.Md5)
 }
 
 func (s *MySuite) TestPutBucket(c *C) {
-	_, _, storage := memory.Start()
-	httpHandler := api.HTTPHandler("", storage)
+	_, _, driver := memory.Start()
+	httpHandler := api.HTTPHandler("", driver)
 	testServer := httptest.NewServer(httpHandler)
 	defer testServer.Close()
 
-	buckets, err := storage.ListBuckets()
+	buckets, err := driver.ListBuckets()
 	c.Assert(len(buckets), Equals, 0)
 	c.Assert(err, IsNil)
 
@@ -234,23 +234,23 @@ func (s *MySuite) TestPutBucket(c *C) {
 	c.Assert(response.StatusCode, Equals, http.StatusOK)
 
 	// check bucket exists
-	buckets, err = storage.ListBuckets()
+	buckets, err = driver.ListBuckets()
 	c.Assert(len(buckets), Equals, 1)
 	c.Assert(err, IsNil)
 	c.Assert(buckets[0].Name, Equals, "bucket")
 }
 
 func (s *MySuite) TestPutObject(c *C) {
-	_, _, storage := memory.Start()
-	httpHandler := api.HTTPHandler("", storage)
+	_, _, driver := memory.Start()
+	httpHandler := api.HTTPHandler("", driver)
 	testServer := httptest.NewServer(httpHandler)
 	defer testServer.Close()
 
-	resources := mstorage.BucketResourcesMetadata{}
+	resources := drivers.BucketResourcesMetadata{}
 
 	resources.Maxkeys = 1000
 	resources.Prefix = ""
-	objects, resources, err := storage.ListObjects("bucket", resources)
+	objects, resources, err := driver.ListObjects("bucket", resources)
 	c.Assert(len(objects), Equals, 0)
 	c.Assert(resources.IsTruncated, Equals, false)
 	c.Assert(err, Not(IsNil))
@@ -278,18 +278,18 @@ func (s *MySuite) TestPutObject(c *C) {
 	resources.Maxkeys = 1000
 	resources.Prefix = ""
 
-	objects, resources, err = storage.ListObjects("bucket", resources)
+	objects, resources, err = driver.ListObjects("bucket", resources)
 	c.Assert(len(objects), Equals, 1)
 	c.Assert(resources.IsTruncated, Equals, false)
 	c.Assert(err, IsNil)
 
 	var writer bytes.Buffer
 
-	storage.GetObject(&writer, "bucket", "two")
+	driver.GetObject(&writer, "bucket", "two")
 
 	c.Assert(bytes.Equal(writer.Bytes(), []byte("hello world")), Equals, true)
 
-	metadata, err := storage.GetObjectMetadata("bucket", "two", "")
+	metadata, err := driver.GetObjectMetadata("bucket", "two", "")
 	c.Assert(err, IsNil)
 	lastModified := metadata.Created
 
@@ -298,8 +298,8 @@ func (s *MySuite) TestPutObject(c *C) {
 }
 
 func (s *MySuite) TestListBuckets(c *C) {
-	_, _, storage := memory.Start()
-	httpHandler := api.HTTPHandler("", storage)
+	_, _, driver := memory.Start()
+	httpHandler := api.HTTPHandler("", driver)
 	testServer := httptest.NewServer(httpHandler)
 	defer testServer.Close()
 
@@ -312,7 +312,7 @@ func (s *MySuite) TestListBuckets(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(len(listResponse.Buckets.Bucket), Equals, 0)
 
-	storage.CreateBucket("foo")
+	driver.CreateBucket("foo")
 
 	response, err = http.Get(testServer.URL + "/")
 	defer response.Body.Close()
@@ -324,7 +324,7 @@ func (s *MySuite) TestListBuckets(c *C) {
 	c.Assert(len(listResponse.Buckets.Bucket), Equals, 1)
 	c.Assert(listResponse.Buckets.Bucket[0].Name, Equals, "foo")
 
-	storage.CreateBucket("bar")
+	driver.CreateBucket("bar")
 
 	response, err = http.Get(testServer.URL + "/")
 	defer response.Body.Close()
@@ -377,12 +377,12 @@ func verifyHeaders(c *C, header http.Header, date time.Time, size int, contentTy
 }
 
 func (s *MySuite) TestXMLNameNotInBucketListJson(c *C) {
-	_, _, storage := memory.Start()
-	httpHandler := api.HTTPHandler("", storage)
+	_, _, driver := memory.Start()
+	httpHandler := api.HTTPHandler("", driver)
 	testServer := httptest.NewServer(httpHandler)
 	defer testServer.Close()
 
-	err := storage.CreateBucket("foo")
+	err := driver.CreateBucket("foo")
 	c.Assert(err, IsNil)
 
 	request, err := http.NewRequest("GET", testServer.URL+"/", bytes.NewBufferString(""))
@@ -402,12 +402,12 @@ func (s *MySuite) TestXMLNameNotInBucketListJson(c *C) {
 }
 
 func (s *MySuite) TestXMLNameNotInObjectListJson(c *C) {
-	_, _, storage := memory.Start()
-	httpHandler := api.HTTPHandler("", storage)
+	_, _, driver := memory.Start()
+	httpHandler := api.HTTPHandler("", driver)
 	testServer := httptest.NewServer(httpHandler)
 	defer testServer.Close()
 
-	err := storage.CreateBucket("foo")
+	err := driver.CreateBucket("foo")
 	c.Assert(err, IsNil)
 
 	request, err := http.NewRequest("GET", testServer.URL+"/foo", bytes.NewBufferString(""))
@@ -427,12 +427,12 @@ func (s *MySuite) TestXMLNameNotInObjectListJson(c *C) {
 }
 
 func (s *MySuite) TestContentTypePersists(c *C) {
-	_, _, storage := memory.Start()
-	httpHandler := api.HTTPHandler("", storage)
+	_, _, driver := memory.Start()
+	httpHandler := api.HTTPHandler("", driver)
 	testServer := httptest.NewServer(httpHandler)
 	defer testServer.Close()
 
-	err := storage.CreateBucket("bucket")
+	err := driver.CreateBucket("bucket")
 	c.Assert(err, IsNil)
 
 	client := http.Client{}

pkg/api/headers.go

@@ -24,7 +24,7 @@ import (
 	"strconv"
 	"time"
 
-	mstorage "github.com/minio-io/minio/pkg/storage"
+	"github.com/minio-io/minio/pkg/drivers"
 )
 
 // No encoder interface exists, so we create one.
@@ -58,7 +58,7 @@ func writeErrorResponse(w http.ResponseWriter, response interface{}, acceptsType
 }
 
 // Write object header
-func writeObjectHeaders(w http.ResponseWriter, metadata mstorage.ObjectMetadata) {
+func writeObjectHeaders(w http.ResponseWriter, metadata drivers.ObjectMetadata) {
 	lastModified := metadata.Created.Format(time.RFC1123)
 	// common headers
 	writeCommonHeaders(w, metadata.ContentType)
@@ -69,7 +69,7 @@ func writeObjectHeaders(w http.ResponseWriter, metadata mstorage.ObjectMetadata)
 }
 
 // Write range object header
-func writeRangeObjectHeaders(w http.ResponseWriter, metadata mstorage.ObjectMetadata, ra string) {
+func writeRangeObjectHeaders(w http.ResponseWriter, metadata drivers.ObjectMetadata, ra string) {
 	lastModified := metadata.Created.Format(time.RFC1123)
 	// common headers
 	writeCommonHeaders(w, metadata.ContentType)

pkg/api/resources.go

@@ -20,11 +20,11 @@ import (
 	"net/url"
 	"strconv"
 
-	mstorage "github.com/minio-io/minio/pkg/storage"
+	"github.com/minio-io/minio/pkg/drivers"
 )
 
 // parse bucket url queries
-func getBucketResources(values url.Values) (v mstorage.BucketResourcesMetadata) {
+func getBucketResources(values url.Values) (v drivers.BucketResourcesMetadata) {
 	for key, value := range values {
 		switch true {
 		case key == "prefix":

pkg/drivers/api_testsuite.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package storage
+package drivers
 
 import (
 	"bytes"
@@ -26,7 +26,7 @@ import (
 )
 
 // APITestSuite - collection of API tests
-func APITestSuite(c *check.C, create func() Storage) {
+func APITestSuite(c *check.C, create func() Driver) {
 	testCreateBucket(c, create)
 	testMultipleObjectCreation(c, create)
 	testPaging(c, create)
@@ -43,16 +43,16 @@ func APITestSuite(c *check.C, create func() Storage) {
 	//testContentMd5Set(c, create) TODO
 }
 
-func testCreateBucket(c *check.C, create func() Storage) {
-	storage := create()
-	err := storage.CreateBucket("bucket")
+func testCreateBucket(c *check.C, create func() Driver) {
+	drivers := create()
+	err := drivers.CreateBucket("bucket")
 	c.Assert(err, check.IsNil)
 }
 
-func testMultipleObjectCreation(c *check.C, create func() Storage) {
+func testMultipleObjectCreation(c *check.C, create func() Driver) {
 	objects := make(map[string][]byte)
-	storage := create()
-	err := storage.CreateBucket("bucket")
+	drivers := create()
+	err := drivers.CreateBucket("bucket")
 	c.Assert(err, check.IsNil)
 	for i := 0; i < 10; i++ {
 		randomPerm := rand.Perm(10)
@@ -62,7 +62,7 @@ func testMultipleObjectCreation(c *check.C, create func() Storage) {
 		}
 		key := "obj" + strconv.Itoa(i)
 		objects[key] = []byte(randomString)
-		err := storage.CreateObject("bucket", key, "", "", bytes.NewBufferString(randomString))
+		err := drivers.CreateObject("bucket", key, "", "", bytes.NewBufferString(randomString))
 		c.Assert(err, check.IsNil)
 	}
 
@@ -70,11 +70,11 @@ func testMultipleObjectCreation(c *check.C, create func() Storage) {
 	etags := make(map[string]string)
 	for key, value := range objects {
 		var byteBuffer bytes.Buffer
-		_, err := storage.GetObject(&byteBuffer, "bucket", key)
+		_, err := drivers.GetObject(&byteBuffer, "bucket", key)
 		c.Assert(err, check.IsNil)
 		c.Assert(byteBuffer.Bytes(), check.DeepEquals, value)
 
-		metadata, err := storage.GetObjectMetadata("bucket", key, "")
+		metadata, err := drivers.GetObjectMetadata("bucket", key, "")
 		c.Assert(err, check.IsNil)
 		c.Assert(metadata.Size, check.Equals, int64(len(value)))
 
@@ -84,20 +84,20 @@ func testMultipleObjectCreation(c *check.C, create func() Storage) {
 	}
 }
 
-func testPaging(c *check.C, create func() Storage) {
-	storage := create()
-	storage.CreateBucket("bucket")
+func testPaging(c *check.C, create func() Driver) {
+	drivers := create()
+	drivers.CreateBucket("bucket")
 	resources := BucketResourcesMetadata{}
-	objects, resources, err := storage.ListObjects("bucket", resources)
+	objects, resources, err := drivers.ListObjects("bucket", resources)
 	c.Assert(err, check.IsNil)
 	c.Assert(len(objects), check.Equals, 0)
 	c.Assert(resources.IsTruncated, check.Equals, false)
 	// check before paging occurs
 	for i := 0; i < 5; i++ {
 		key := "obj" + strconv.Itoa(i)
-		storage.CreateObject("bucket", key, "", "", bytes.NewBufferString(key))
+		drivers.CreateObject("bucket", key, "", "", bytes.NewBufferString(key))
 		resources.Maxkeys = 5
-		objects, resources, err = storage.ListObjects("bucket", resources)
+		objects, resources, err = drivers.ListObjects("bucket", resources)
 		c.Assert(len(objects), check.Equals, i+1)
 		c.Assert(resources.IsTruncated, check.Equals, false)
 		c.Assert(err, check.IsNil)
@@ -105,20 +105,20 @@ func testPaging(c *check.C, create func() Storage) {
 	// check after paging occurs pages work
 	for i := 6; i <= 10; i++ {
 		key := "obj" + strconv.Itoa(i)
-		storage.CreateObject("bucket", key, "", "", bytes.NewBufferString(key))
+		drivers.CreateObject("bucket", key, "", "", bytes.NewBufferString(key))
 		resources.Maxkeys = 5
-		objects, resources, err = storage.ListObjects("bucket", resources)
+		objects, resources, err = drivers.ListObjects("bucket", resources)
 		c.Assert(len(objects), check.Equals, 5)
 		c.Assert(resources.IsTruncated, check.Equals, true)
 		c.Assert(err, check.IsNil)
 	}
 	// check paging with prefix at end returns less objects
 	{
-		storage.CreateObject("bucket", "newPrefix", "", "", bytes.NewBufferString("prefix1"))
-		storage.CreateObject("bucket", "newPrefix2", "", "", bytes.NewBufferString("prefix2"))
+		drivers.CreateObject("bucket", "newPrefix", "", "", bytes.NewBufferString("prefix1"))
+		drivers.CreateObject("bucket", "newPrefix2", "", "", bytes.NewBufferString("prefix2"))
 		resources.Prefix = "new"
 		resources.Maxkeys = 5
-		objects, resources, err = storage.ListObjects("bucket", resources)
+		objects, resources, err = drivers.ListObjects("bucket", resources)
 		c.Assert(len(objects), check.Equals, 2)
 	}
 
@@ -126,7 +126,7 @@ func testPaging(c *check.C, create func() Storage) {
 	{
 		resources.Prefix = ""
 		resources.Maxkeys = 1000
-		objects, resources, err = storage.ListObjects("bucket", resources)
+		objects, resources, err = drivers.ListObjects("bucket", resources)
 		c.Assert(objects[0].Key, check.Equals, "newPrefix")
 		c.Assert(objects[1].Key, check.Equals, "newPrefix2")
 		c.Assert(objects[2].Key, check.Equals, "obj0")
@@ -136,14 +136,14 @@ func testPaging(c *check.C, create func() Storage) {
 
 	// check delimited results with delimiter and prefix
 	{
-		storage.CreateObject("bucket", "this/is/delimited", "", "", bytes.NewBufferString("prefix1"))
-		storage.CreateObject("bucket", "this/is/also/a/delimited/file", "", "", bytes.NewBufferString("prefix2"))
+		drivers.CreateObject("bucket", "this/is/delimited", "", "", bytes.NewBufferString("prefix1"))
+		drivers.CreateObject("bucket", "this/is/also/a/delimited/file", "", "", bytes.NewBufferString("prefix2"))
 		var prefixes []string
 		resources.CommonPrefixes = prefixes // allocate new everytime
 		resources.Delimiter = "/"
 		resources.Prefix = "this/is/"
 		resources.Maxkeys = 10
-		objects, resources, err = storage.ListObjects("bucket", resources)
+		objects, resources, err = drivers.ListObjects("bucket", resources)
 		c.Assert(err, check.IsNil)
 		c.Assert(len(objects), check.Equals, 1)
 		c.Assert(resources.CommonPrefixes[0], check.Equals, "also/")
@@ -157,7 +157,7 @@ func testPaging(c *check.C, create func() Storage) {
 		resources.Delimiter = "/"
 		resources.Prefix = ""
 		resources.Maxkeys = 1000
-		objects, resources, err = storage.ListObjects("bucket", resources)
+		objects, resources, err = drivers.ListObjects("bucket", resources)
 		c.Assert(objects[0].Key, check.Equals, "newPrefix")
 		c.Assert(objects[1].Key, check.Equals, "newPrefix2")
 		c.Assert(objects[2].Key, check.Equals, "obj0")
@@ -171,7 +171,7 @@ func testPaging(c *check.C, create func() Storage) {
 		resources.Prefix = "obj"
 		resources.Delimiter = ""
 		resources.Maxkeys = 1000
-		objects, resources, err = storage.ListObjects("bucket", resources)
+		objects, resources, err = drivers.ListObjects("bucket", resources)
 		c.Assert(objects[0].Key, check.Equals, "obj0")
 		c.Assert(objects[1].Key, check.Equals, "obj1")
 		c.Assert(objects[2].Key, check.Equals, "obj10")
@@ -182,95 +182,95 @@ func testPaging(c *check.C, create func() Storage) {
 	{
 		resources.Prefix = "new"
 		resources.Maxkeys = 5
-		objects, resources, err = storage.ListObjects("bucket", resources)
+		objects, resources, err = drivers.ListObjects("bucket", resources)
 		c.Assert(objects[0].Key, check.Equals, "newPrefix")
 		c.Assert(objects[1].Key, check.Equals, "newPrefix2")
 	}
 }
 
-func testObjectOverwriteFails(c *check.C, create func() Storage) {
-	storage := create()
-	storage.CreateBucket("bucket")
-	err := storage.CreateObject("bucket", "object", "", "", bytes.NewBufferString("one"))
+func testObjectOverwriteFails(c *check.C, create func() Driver) {
+	drivers := create()
+	drivers.CreateBucket("bucket")
+	err := drivers.CreateObject("bucket", "object", "", "", bytes.NewBufferString("one"))
 	c.Assert(err, check.IsNil)
-	err = storage.CreateObject("bucket", "object", "", "", bytes.NewBufferString("three"))
+	err = drivers.CreateObject("bucket", "object", "", "", bytes.NewBufferString("three"))
 	c.Assert(err, check.Not(check.IsNil))
 	var bytesBuffer bytes.Buffer
-	length, err := storage.GetObject(&bytesBuffer, "bucket", "object")
+	length, err := drivers.GetObject(&bytesBuffer, "bucket", "object")
 	c.Assert(length, check.Equals, int64(len("one")))
 	c.Assert(err, check.IsNil)
 	c.Assert(string(bytesBuffer.Bytes()), check.Equals, "one")
 }
 
-func testNonExistantBucketOperations(c *check.C, create func() Storage) {
-	storage := create()
-	err := storage.CreateObject("bucket", "object", "", "", bytes.NewBufferString("one"))
+func testNonExistantBucketOperations(c *check.C, create func() Driver) {
+	drivers := create()
+	err := drivers.CreateObject("bucket", "object", "", "", bytes.NewBufferString("one"))
 	c.Assert(err, check.Not(check.IsNil))
 }
 
-func testBucketRecreateFails(c *check.C, create func() Storage) {
-	storage := create()
-	err := storage.CreateBucket("string")
+func testBucketRecreateFails(c *check.C, create func() Driver) {
+	drivers := create()
+	err := drivers.CreateBucket("string")
 	c.Assert(err, check.IsNil)
-	err = storage.CreateBucket("string")
+	err = drivers.CreateBucket("string")
 	c.Assert(err, check.Not(check.IsNil))
 }
 
-func testPutObjectInSubdir(c *check.C, create func() Storage) {
-	storage := create()
-	err := storage.CreateBucket("bucket")
+func testPutObjectInSubdir(c *check.C, create func() Driver) {
+	drivers := create()
+	err := drivers.CreateBucket("bucket")
 	c.Assert(err, check.IsNil)
-	err = storage.CreateObject("bucket", "dir1/dir2/object", "", "", bytes.NewBufferString("hello world"))
+	err = drivers.CreateObject("bucket", "dir1/dir2/object", "", "", bytes.NewBufferString("hello world"))
 	c.Assert(err, check.IsNil)
 	var bytesBuffer bytes.Buffer
-	length, err := storage.GetObject(&bytesBuffer, "bucket", "dir1/dir2/object")
+	length, err := drivers.GetObject(&bytesBuffer, "bucket", "dir1/dir2/object")
 	c.Assert(len(bytesBuffer.Bytes()), check.Equals, len("hello world"))
 	c.Assert(int64(len(bytesBuffer.Bytes())), check.Equals, length)
 	c.Assert(err, check.IsNil)
 }
 
-func testListBuckets(c *check.C, create func() Storage) {
-	storage := create()
+func testListBuckets(c *check.C, create func() Driver) {
+	drivers := create()
 
 	// test empty list
-	buckets, err := storage.ListBuckets()
+	buckets, err := drivers.ListBuckets()
 	c.Assert(err, check.IsNil)
 	c.Assert(len(buckets), check.Equals, 0)
 
 	// add one and test exists
-	err = storage.CreateBucket("bucket1")
+	err = drivers.CreateBucket("bucket1")
 	c.Assert(err, check.IsNil)
 
-	buckets, err = storage.ListBuckets()
+	buckets, err = drivers.ListBuckets()
 	c.Assert(len(buckets), check.Equals, 1)
 	c.Assert(err, check.IsNil)
 
 	// add two and test exists
-	err = storage.CreateBucket("bucket2")
+	err = drivers.CreateBucket("bucket2")
 	c.Assert(err, check.IsNil)
 
-	buckets, err = storage.ListBuckets()
+	buckets, err = drivers.ListBuckets()
 	c.Assert(len(buckets), check.Equals, 2)
 	c.Assert(err, check.IsNil)
 
 	// add three and test exists + prefix
-	err = storage.CreateBucket("bucket22")
+	err = drivers.CreateBucket("bucket22")
 
-	buckets, err = storage.ListBuckets()
+	buckets, err = drivers.ListBuckets()
 	c.Assert(len(buckets), check.Equals, 3)
 	c.Assert(err, check.IsNil)
 }
 
-func testListBucketsOrder(c *check.C, create func() Storage) {
+func testListBucketsOrder(c *check.C, create func() Driver) {
 	// if implementation contains a map, order of map keys will vary.
 	// this ensures they return in the same order each time
 	for i := 0; i < 10; i++ {
-		storage := create()
+		drivers := create()
 		// add one and test exists
-		storage.CreateBucket("bucket1")
-		storage.CreateBucket("bucket2")
+		drivers.CreateBucket("bucket1")
+		drivers.CreateBucket("bucket2")
 
-		buckets, err := storage.ListBuckets()
+		buckets, err := drivers.ListBuckets()
 		c.Assert(len(buckets), check.Equals, 2)
 		c.Assert(err, check.IsNil)
 		c.Assert(buckets[0].Name, check.Equals, "bucket1")
@@ -278,22 +278,22 @@ func testListBucketsOrder(c *check.C, create func() Storage) {
 	}
 }
 
-func testListObjectsTestsForNonExistantBucket(c *check.C, create func() Storage) {
-	storage := create()
+func testListObjectsTestsForNonExistantBucket(c *check.C, create func() Driver) {
+	drivers := create()
 	resources := BucketResourcesMetadata{Prefix: "", Maxkeys: 1000}
-	objects, resources, err := storage.ListObjects("bucket", resources)
+	objects, resources, err := drivers.ListObjects("bucket", resources)
 	c.Assert(err, check.Not(check.IsNil))
 	c.Assert(resources.IsTruncated, check.Equals, false)
 	c.Assert(len(objects), check.Equals, 0)
 }
 
-func testNonExistantObjectInBucket(c *check.C, create func() Storage) {
-	storage := create()
-	err := storage.CreateBucket("bucket")
+func testNonExistantObjectInBucket(c *check.C, create func() Driver) {
+	drivers := create()
+	err := drivers.CreateBucket("bucket")
 	c.Assert(err, check.IsNil)
 
 	var byteBuffer bytes.Buffer
-	length, err := storage.GetObject(&byteBuffer, "bucket", "dir1")
+	length, err := drivers.GetObject(&byteBuffer, "bucket", "dir1")
 	c.Assert(length, check.Equals, int64(0))
 	c.Assert(err, check.Not(check.IsNil))
 	c.Assert(len(byteBuffer.Bytes()), check.Equals, 0)
@@ -309,16 +309,16 @@ func testNonExistantObjectInBucket(c *check.C, create func() Storage) {
 	}
 }
 
-func testGetDirectoryReturnsObjectNotFound(c *check.C, create func() Storage) {
-	storage := create()
-	err := storage.CreateBucket("bucket")
+func testGetDirectoryReturnsObjectNotFound(c *check.C, create func() Driver) {
+	drivers := create()
+	err := drivers.CreateBucket("bucket")
 	c.Assert(err, check.IsNil)
 
-	err = storage.CreateObject("bucket", "dir1/dir2/object", "", "", bytes.NewBufferString("hello world"))
+	err = drivers.CreateObject("bucket", "dir1/dir2/object", "", "", bytes.NewBufferString("hello world"))
 	c.Assert(err, check.IsNil)
 
 	var byteBuffer bytes.Buffer
-	length, err := storage.GetObject(&byteBuffer, "bucket", "dir1")
+	length, err := drivers.GetObject(&byteBuffer, "bucket", "dir1")
 	c.Assert(length, check.Equals, int64(0))
 	switch err := err.(type) {
 	case ObjectNotFound:
@@ -335,7 +335,7 @@ func testGetDirectoryReturnsObjectNotFound(c *check.C, create func() Storage) {
 	c.Assert(len(byteBuffer.Bytes()), check.Equals, 0)
 
 	var byteBuffer2 bytes.Buffer
-	length, err = storage.GetObject(&byteBuffer, "bucket", "dir1/")
+	length, err = drivers.GetObject(&byteBuffer, "bucket", "dir1/")
 	c.Assert(length, check.Equals, int64(0))
 	switch err := err.(type) {
 	case ObjectNotFound:
@@ -352,40 +352,40 @@ func testGetDirectoryReturnsObjectNotFound(c *check.C, create func() Storage) {
 	c.Assert(len(byteBuffer2.Bytes()), check.Equals, 0)
 }
 
-func testDefaultContentType(c *check.C, create func() Storage) {
-	storage := create()
-	err := storage.CreateBucket("bucket")
+func testDefaultContentType(c *check.C, create func() Driver) {
+	drivers := create()
+	err := drivers.CreateBucket("bucket")
 	c.Assert(err, check.IsNil)
 
 	// test empty
-	err = storage.CreateObject("bucket", "one", "", "", bytes.NewBufferString("one"))
-	metadata, err := storage.GetObjectMetadata("bucket", "one", "")
+	err = drivers.CreateObject("bucket", "one", "", "", bytes.NewBufferString("one"))
+	metadata, err := drivers.GetObjectMetadata("bucket", "one", "")
 	c.Assert(err, check.IsNil)
 	c.Assert(metadata.ContentType, check.Equals, "application/octet-stream")
 
 	// test custom
-	storage.CreateObject("bucket", "two", "application/text", "", bytes.NewBufferString("two"))
-	metadata, err = storage.GetObjectMetadata("bucket", "two", "")
+	drivers.CreateObject("bucket", "two", "application/text", "", bytes.NewBufferString("two"))
+	metadata, err = drivers.GetObjectMetadata("bucket", "two", "")
 	c.Assert(err, check.IsNil)
 	c.Assert(metadata.ContentType, check.Equals, "application/text")
 
 	// test trim space
-	storage.CreateObject("bucket", "three", "\tapplication/json    ", "", bytes.NewBufferString("three"))
-	metadata, err = storage.GetObjectMetadata("bucket", "three", "")
+	drivers.CreateObject("bucket", "three", "\tapplication/json    ", "", bytes.NewBufferString("three"))
+	metadata, err = drivers.GetObjectMetadata("bucket", "three", "")
 	c.Assert(err, check.IsNil)
 	c.Assert(metadata.ContentType, check.Equals, "application/json")
 }
 
 /*
-func testContentMd5Set(c *check.C, create func() Storage) {
-	storage := create()
-	err := storage.CreateBucket("bucket")
+func testContentMd5Set(c *check.C, create func() Driver) {
+	drivers := create()
+	err := drivers.CreateBucket("bucket")
 	c.Assert(err, check.IsNil)
 
 	// test md5 invalid
-	err = storage.CreateObject("bucket", "one", "", "NWJiZjVhNTIzMjhlNzQzOWFlNmU3MTlkZmU3MTIyMDA", bytes.NewBufferString("one"))
+	err = drivers.CreateObject("bucket", "one", "", "NWJiZjVhNTIzMjhlNzQzOWFlNmU3MTlkZmU3MTIyMDA", bytes.NewBufferString("one"))
 	c.Assert(err, check.Not(check.IsNil))
-	err = storage.CreateObject("bucket", "two", "", "NWJiZjVhNTIzMjhlNzQzOWFlNmU3MTlkZmU3MTIyMDA=", bytes.NewBufferString("one"))
+	err = drivers.CreateObject("bucket", "two", "", "NWJiZjVhNTIzMjhlNzQzOWFlNmU3MTlkZmU3MTIyMDA=", bytes.NewBufferString("one"))
 	c.Assert(err, check.IsNil)
 }
 */

pkg/drivers/bucket_policy.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package storage
+package drivers
 
 import (
 	"encoding/json"

pkg/drivers/bucket_policy_compat.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package storage
+package drivers
 
 // This file implements compatability layer for AWS clients
 

pkg/drivers/date.go

@@ -1,4 +1,20 @@
-package storage
+/*
+ * Minimalist Object Storage, (C) 2015 Minio, 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,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package drivers
 
 import (
 	"errors"

pkg/drivers/donut/donut.go

@@ -14,21 +14,22 @@
  * limitations under the License.
  */
 
-package donutstorage
+package donut
 
 import (
 	"errors"
-	"github.com/minio-io/minio/pkg/storage"
-	"github.com/minio-io/minio/pkg/storage/donut"
 	"io"
 	"sort"
 	"strconv"
 	"strings"
 	"time"
+
+	"github.com/minio-io/minio/pkg/drivers"
+	"github.com/minio-io/minio/pkg/storage/donut"
 )
 
-// Storage creates a new single disk storage driver using donut without encoding.
-type Storage struct {
+// donutDriver - creates a new single disk drivers driver using donut
+type donutDriver struct {
 	donut donut.Donut
 }
 
@@ -37,15 +38,14 @@ const (
 )
 
 // Start a single disk subsystem
-func Start(path string) (chan<- string, <-chan error, storage.Storage) {
-
+func Start(path string) (chan<- string, <-chan error, drivers.Driver) {
 	ctrlChannel := make(chan string)
 	errorChannel := make(chan error)
-	s := new(Storage)
+	s := new(donutDriver)
 
 	// TODO donut driver should be passed in as Start param and driven by config
 	var err error
-	s.donut, err = donut.NewDonutDriver(path)
+	s.donut, err = donut.NewDonut(path)
 	if err != nil {
 		errorChannel <- err
 	}
@@ -54,13 +54,13 @@ func Start(path string) (chan<- string, <-chan error, storage.Storage) {
 	return ctrlChannel, errorChannel, s
 }
 
-func start(ctrlChannel <-chan string, errorChannel chan<- error, s *Storage) {
+func start(ctrlChannel <-chan string, errorChannel chan<- error, s *donutDriver) {
 	close(errorChannel)
 }
 
 // ListBuckets returns a list of buckets
-func (donutStorage Storage) ListBuckets() (results []storage.BucketMetadata, err error) {
-	buckets, err := donutStorage.donut.ListBuckets()
+func (d donutDriver) ListBuckets() (results []drivers.BucketMetadata, err error) {
+	buckets, err := d.donut.ListBuckets()
 	if err != nil {
 		return nil, err
 	}
@@ -68,7 +68,7 @@ func (donutStorage Storage) ListBuckets() (results []storage.BucketMetadata, err
 		if err != nil {
 			return nil, err
 		}
-		result := storage.BucketMetadata{
+		result := drivers.BucketMetadata{
 			Name: bucket,
 			// TODO Add real created date
 			Created: time.Now(),
@@ -79,30 +79,30 @@ func (donutStorage Storage) ListBuckets() (results []storage.BucketMetadata, err
 }
 
 // CreateBucket creates a new bucket
-func (donutStorage Storage) CreateBucket(bucket string) error {
-	return donutStorage.donut.CreateBucket(bucket)
+func (d donutDriver) CreateBucket(bucket string) error {
+	return d.donut.CreateBucket(bucket)
 }
 
 // GetBucketMetadata retrieves an bucket's metadata
-func (donutStorage Storage) GetBucketMetadata(bucket string) (storage.BucketMetadata, error) {
-	return storage.BucketMetadata{}, errors.New("Not Implemented")
+func (d donutDriver) GetBucketMetadata(bucket string) (drivers.BucketMetadata, error) {
+	return drivers.BucketMetadata{}, errors.New("Not Implemented")
 }
 
 // CreateBucketPolicy sets a bucket's access policy
-func (donutStorage Storage) CreateBucketPolicy(bucket string, p storage.BucketPolicy) error {
+func (d donutDriver) CreateBucketPolicy(bucket string, p drivers.BucketPolicy) error {
 	return errors.New("Not Implemented")
 }
 
 // GetBucketPolicy returns a bucket's access policy
-func (donutStorage Storage) GetBucketPolicy(bucket string) (storage.BucketPolicy, error) {
-	return storage.BucketPolicy{}, errors.New("Not Implemented")
+func (d donutDriver) GetBucketPolicy(bucket string) (drivers.BucketPolicy, error) {
+	return drivers.BucketPolicy{}, errors.New("Not Implemented")
 }
 
 // GetObject retrieves an object and writes it to a writer
-func (donutStorage Storage) GetObject(target io.Writer, bucket, key string) (int64, error) {
-	reader, err := donutStorage.donut.GetObject(bucket, key)
+func (d donutDriver) GetObject(target io.Writer, bucket, key string) (int64, error) {
+	reader, err := d.donut.GetObjectReader(bucket, key)
 	if err != nil {
-		return 0, storage.ObjectNotFound{
+		return 0, drivers.ObjectNotFound{
 			Bucket: bucket,
 			Object: key,
 		}
@@ -110,23 +110,23 @@ func (donutStorage Storage) GetObject(target io.Writer, bucket, key string) (int
 	return io.Copy(target, reader)
 }
 
-// GetPartialObject retrieves an object and writes it to a writer
-func (donutStorage Storage) GetPartialObject(w io.Writer, bucket, object string, start, length int64) (int64, error) {
+// GetPartialObject retrieves an object range and writes it to a writer
+func (d donutDriver) GetPartialObject(w io.Writer, bucket, object string, start, length int64) (int64, error) {
 	return 0, errors.New("Not Implemented")
 }
 
 // GetObjectMetadata retrieves an object's metadata
-func (donutStorage Storage) GetObjectMetadata(bucket, key string, prefix string) (storage.ObjectMetadata, error) {
-	metadata, err := donutStorage.donut.GetObjectMetadata(bucket, key)
+func (d donutDriver) GetObjectMetadata(bucket, key string, prefix string) (drivers.ObjectMetadata, error) {
+	metadata, err := d.donut.GetObjectMetadata(bucket, key)
 	created, err := time.Parse(time.RFC3339Nano, metadata["sys.created"])
 	if err != nil {
-		return storage.ObjectMetadata{}, err
+		return drivers.ObjectMetadata{}, err
 	}
 	size, err := strconv.ParseInt(metadata["sys.size"], 10, 64)
 	if err != nil {
-		return storage.ObjectMetadata{}, err
+		return drivers.ObjectMetadata{}, err
 	}
-	objectMetadata := storage.ObjectMetadata{
+	objectMetadata := drivers.ObjectMetadata{
 		Bucket: bucket,
 		Key:    key,
 
@@ -138,12 +138,12 @@ func (donutStorage Storage) GetObjectMetadata(bucket, key string, prefix string)
 	return objectMetadata, nil
 }
 
-// ListObjects lists objects
-func (donutStorage Storage) ListObjects(bucket string, resources storage.BucketResourcesMetadata) ([]storage.ObjectMetadata, storage.BucketResourcesMetadata, error) {
+// ListObjects - returns list of objects
+func (d donutDriver) ListObjects(bucket string, resources drivers.BucketResourcesMetadata) ([]drivers.ObjectMetadata, drivers.BucketResourcesMetadata, error) {
 	// TODO Fix IsPrefixSet && IsDelimiterSet and use them
-	objects, err := donutStorage.donut.ListObjects(bucket)
+	objects, err := d.donut.ListObjects(bucket)
 	if err != nil {
-		return nil, storage.BucketResourcesMetadata{}, err
+		return nil, drivers.BucketResourcesMetadata{}, err
 	}
 	sort.Strings(objects)
 	if resources.Prefix != "" {
@@ -166,15 +166,15 @@ func (donutStorage Storage) ListObjects(bucket string, resources storage.BucketR
 		actualObjects = objects
 	}
 
-	var results []storage.ObjectMetadata
+	var results []drivers.ObjectMetadata
 	for _, object := range actualObjects {
 		if len(results) >= resources.Maxkeys {
 			resources.IsTruncated = true
 			break
 		}
-		metadata, err := donutStorage.GetObjectMetadata(bucket, resources.Prefix+object, "")
+		metadata, err := d.GetObjectMetadata(bucket, resources.Prefix+object, "")
 		if err != nil {
-			return nil, storage.BucketResourcesMetadata{}, err
+			return nil, drivers.BucketResourcesMetadata{}, err
 		}
 		results = append(results, metadata)
 	}
@@ -241,8 +241,8 @@ func uniqueObjects(objects []string) []string {
 }
 
 // CreateObject creates a new object
-func (donutStorage Storage) CreateObject(bucketKey, objectKey, contentType, expectedMd5sum string, reader io.Reader) error {
-	writer, err := donutStorage.donut.GetObjectWriter(bucketKey, objectKey)
+func (d donutDriver) CreateObject(bucketKey, objectKey, contentType, expectedMd5sum string, reader io.Reader) error {
+	writer, err := d.donut.GetObjectWriter(bucketKey, objectKey)
 	if err != nil {
 		return err
 	}

pkg/drivers/donut/donut_test.go

@@ -14,14 +14,14 @@
  * limitations under the License.
  */
 
-package donutstorage
+package donut
 
 import (
 	"io/ioutil"
 	"os"
 	"testing"
 
-	mstorage "github.com/minio-io/minio/pkg/storage"
+	"github.com/minio-io/minio/pkg/drivers"
 
 	. "gopkg.in/check.v1"
 )
@@ -35,14 +35,14 @@ var _ = Suite(&MySuite{})
 func (s *MySuite) TestAPISuite(c *C) {
 	//	c.Skip("Not Implemented")
 	var storageList []string
-	create := func() mstorage.Storage {
+	create := func() drivers.Driver {
 		path, err := ioutil.TempDir(os.TempDir(), "minio-fs-")
 		c.Check(err, IsNil)
 		storageList = append(storageList, path)
 		_, _, store := Start(path) // TODO Make InMemory driver
 		return store
 	}
-	mstorage.APITestSuite(c, create)
+	drivers.APITestSuite(c, create)
 	removeRoots(c, storageList)
 }
 

pkg/drivers/driver.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package storage
+package drivers
 
 import (
 	"io"
@@ -23,8 +23,8 @@ import (
 	"unicode/utf8"
 )
 
-// Storage - generic API interface
-type Storage interface {
+// Driver - generic API interface for various drivers - donut, file, memory
+type Driver interface {
 	// Bucket Operations
 	ListBuckets() ([]BucketMetadata, error)
 	CreateBucket(bucket string) error

pkg/drivers/errors.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package storage
+package drivers
 
 // BackendError - generic disk backend error
 type BackendError struct {

pkg/drivers/file/file.go

@@ -19,20 +19,22 @@ package file
 import (
 	"os"
 	"sync"
+
+	"github.com/minio-io/minio/pkg/drivers"
 )
 
 // Start filesystem channel
-func Start(root string) (chan<- string, <-chan error, *Storage) {
+func Start(root string) (chan<- string, <-chan error, drivers.Driver) {
 	ctrlChannel := make(chan string)
 	errorChannel := make(chan error)
-	s := Storage{}
+	s := new(fileDriver)
 	s.root = root
 	s.lock = new(sync.Mutex)
-	go start(ctrlChannel, errorChannel, &s)
-	return ctrlChannel, errorChannel, &s
+	go start(ctrlChannel, errorChannel, s)
+	return ctrlChannel, errorChannel, s
 }
 
-func start(ctrlChannel <-chan string, errorChannel chan<- error, s *Storage) {
+func start(ctrlChannel <-chan string, errorChannel chan<- error, s *fileDriver) {
 	err := os.MkdirAll(s.root, 0700)
 	errorChannel <- err
 	close(errorChannel)

pkg/drivers/file/file_bucket.go

@@ -0,0 +1,133 @@
+/*
+ * Minimalist Object File, (C) 2015 Minio, 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,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package file
+
+import (
+	"os"
+	"path"
+	"sort"
+	"strings"
+
+	"io/ioutil"
+	"path/filepath"
+
+	"github.com/minio-io/minio/pkg/drivers"
+)
+
+/// Bucket Operations
+
+// ListBuckets - Get service
+func (file *fileDriver) ListBuckets() ([]drivers.BucketMetadata, error) {
+	files, err := ioutil.ReadDir(file.root)
+	if err != nil {
+		return []drivers.BucketMetadata{}, drivers.EmbedError("bucket", "", err)
+	}
+
+	var metadataList []drivers.BucketMetadata
+	for _, fileName := range files {
+		// Skip policy files
+		if strings.HasSuffix(fileName.Name(), "_policy.json") {
+			continue
+		}
+		if !fileName.IsDir() {
+			return []drivers.BucketMetadata{}, drivers.BackendCorrupted{Path: file.root}
+		}
+		metadata := drivers.BucketMetadata{
+			Name:    fileName.Name(),
+			Created: fileName.ModTime(), // TODO - provide real created time
+		}
+		metadataList = append(metadataList, metadata)
+	}
+	return metadataList, nil
+}
+
+// CreateBucket - PUT Bucket
+func (file *fileDriver) CreateBucket(bucket string) error {
+	file.lock.Lock()
+	defer file.lock.Unlock()
+
+	// verify bucket path legal
+	if drivers.IsValidBucket(bucket) == false {
+		return drivers.BucketNameInvalid{Bucket: bucket}
+	}
+
+	// get bucket path
+	bucketDir := path.Join(file.root, bucket)
+
+	// check if bucket exists
+	if _, err := os.Stat(bucketDir); err == nil {
+		return drivers.BucketExists{
+			Bucket: bucket,
+		}
+	}
+
+	// make bucket
+	err := os.Mkdir(bucketDir, 0700)
+	if err != nil {
+		return drivers.EmbedError(bucket, "", err)
+	}
+	return nil
+}
+
+// ListObjects - GET bucket (list objects)
+func (file *fileDriver) ListObjects(bucket string, resources drivers.BucketResourcesMetadata) ([]drivers.ObjectMetadata, drivers.BucketResourcesMetadata, error) {
+	p := bucketDir{}
+	p.files = make(map[string]os.FileInfo)
+
+	if drivers.IsValidBucket(bucket) == false {
+		return []drivers.ObjectMetadata{}, resources, drivers.BucketNameInvalid{Bucket: bucket}
+	}
+	if resources.Prefix != "" && drivers.IsValidObject(resources.Prefix) == false {
+		return []drivers.ObjectMetadata{}, resources, drivers.ObjectNameInvalid{Bucket: bucket, Object: resources.Prefix}
+	}
+
+	rootPrefix := path.Join(file.root, bucket)
+	// check bucket exists
+	if _, err := os.Stat(rootPrefix); os.IsNotExist(err) {
+		return []drivers.ObjectMetadata{}, resources, drivers.BucketNotFound{Bucket: bucket}
+	}
+
+	p.root = rootPrefix
+	err := filepath.Walk(rootPrefix, p.getAllFiles)
+	if err != nil {
+		return []drivers.ObjectMetadata{}, resources, drivers.EmbedError(bucket, "", err)
+	}
+
+	var metadataList []drivers.ObjectMetadata
+	var metadata drivers.ObjectMetadata
+
+	// Populate filtering mode
+	resources.Mode = drivers.GetMode(resources)
+
+	for name, f := range p.files {
+		if len(metadataList) >= resources.Maxkeys {
+			resources.IsTruncated = true
+			goto ret
+		}
+		metadata, resources, err = file.filter(bucket, name, f, resources)
+		if err != nil {
+			return []drivers.ObjectMetadata{}, resources, drivers.EmbedError(bucket, "", err)
+		}
+		if metadata.Bucket != "" {
+			metadataList = append(metadataList, metadata)
+		}
+	}
+
+ret:
+	sort.Sort(byObjectKey(metadataList))
+	return metadataList, resources, nil
+}

pkg/drivers/file/file_common.go

@@ -23,17 +23,17 @@ import (
 	"strings"
 	"sync"
 
-	mstorage "github.com/minio-io/minio/pkg/storage"
+	"github.com/minio-io/minio/pkg/drivers"
 )
 
-// Storage - file local variables
-type Storage struct {
+// fileDriver - file local variables
+type fileDriver struct {
 	root string
 	lock *sync.Mutex
 }
 
-// Metadata - carries metadata about object
-type Metadata struct {
+// fileMetadata - carries metadata about object
+type fileMetadata struct {
 	Md5sum      []byte
 	ContentType string
 }
@@ -77,7 +77,7 @@ func delimiter(object, delimiter string) string {
 	return delimitedStr
 }
 
-type byObjectKey []mstorage.ObjectMetadata
+type byObjectKey []drivers.ObjectMetadata
 
 // Len
 func (b byObjectKey) Len() int { return len(b) }

pkg/drivers/file/file_filter.go

@@ -20,13 +20,13 @@ import (
 	"os"
 	"strings"
 
-	mstorage "github.com/minio-io/minio/pkg/storage"
+	"github.com/minio-io/minio/pkg/drivers"
 )
 
 // TODO handle resources.Marker
-func (storage *Storage) filter(bucket, name string, file os.FileInfo, resources mstorage.BucketResourcesMetadata) (mstorage.ObjectMetadata, mstorage.BucketResourcesMetadata, error) {
+func (file *fileDriver) filter(bucket, name string, f os.FileInfo, resources drivers.BucketResourcesMetadata) (drivers.ObjectMetadata, drivers.BucketResourcesMetadata, error) {
 	var err error
-	var metadata mstorage.ObjectMetadata
+	var metadata drivers.ObjectMetadata
 
 	switch true {
 	// Both delimiter and Prefix is present
@@ -37,15 +37,15 @@ func (storage *Storage) filter(bucket, name string, file os.FileInfo, resources
 			switch true {
 			case name == resources.Prefix:
 				// Use resources.Prefix to filter out delimited files
-				metadata, err = storage.GetObjectMetadata(bucket, name, resources.Prefix)
+				metadata, err = file.GetObjectMetadata(bucket, name, resources.Prefix)
 				if err != nil {
-					return mstorage.ObjectMetadata{}, resources, mstorage.EmbedError(bucket, "", err)
+					return drivers.ObjectMetadata{}, resources, drivers.EmbedError(bucket, "", err)
 				}
-			case delimitedName == file.Name():
+			case delimitedName == f.Name():
 				// Use resources.Prefix to filter out delimited files
-				metadata, err = storage.GetObjectMetadata(bucket, name, resources.Prefix)
+				metadata, err = file.GetObjectMetadata(bucket, name, resources.Prefix)
 				if err != nil {
-					return mstorage.ObjectMetadata{}, resources, mstorage.EmbedError(bucket, "", err)
+					return drivers.ObjectMetadata{}, resources, drivers.EmbedError(bucket, "", err)
 				}
 			case delimitedName != "":
 				if delimitedName == resources.Delimiter {
@@ -61,15 +61,15 @@ func (storage *Storage) filter(bucket, name string, file os.FileInfo, resources
 		switch true {
 		case delimitedName == "":
 			// Do not strip prefix object output
-			metadata, err = storage.GetObjectMetadata(bucket, name, "")
+			metadata, err = file.GetObjectMetadata(bucket, name, "")
 			if err != nil {
-				return mstorage.ObjectMetadata{}, resources, mstorage.EmbedError(bucket, "", err)
+				return drivers.ObjectMetadata{}, resources, drivers.EmbedError(bucket, "", err)
 			}
-		case delimitedName == file.Name():
+		case delimitedName == f.Name():
 			// Do not strip prefix object output
-			metadata, err = storage.GetObjectMetadata(bucket, name, "")
+			metadata, err = file.GetObjectMetadata(bucket, name, "")
 			if err != nil {
-				return mstorage.ObjectMetadata{}, resources, mstorage.EmbedError(bucket, "", err)
+				return drivers.ObjectMetadata{}, resources, drivers.EmbedError(bucket, "", err)
 			}
 		case delimitedName != "":
 			resources.CommonPrefixes = appendUniq(resources.CommonPrefixes, delimitedName)
@@ -78,15 +78,15 @@ func (storage *Storage) filter(bucket, name string, file os.FileInfo, resources
 	case resources.IsPrefixSet():
 		if strings.HasPrefix(name, resources.Prefix) {
 			// Do not strip prefix object output
-			metadata, err = storage.GetObjectMetadata(bucket, name, "")
+			metadata, err = file.GetObjectMetadata(bucket, name, "")
 			if err != nil {
-				return mstorage.ObjectMetadata{}, resources, mstorage.EmbedError(bucket, "", err)
+				return drivers.ObjectMetadata{}, resources, drivers.EmbedError(bucket, "", err)
 			}
 		}
 	case resources.IsDefault():
-		metadata, err = storage.GetObjectMetadata(bucket, name, "")
+		metadata, err = file.GetObjectMetadata(bucket, name, "")
 		if err != nil {
-			return mstorage.ObjectMetadata{}, resources, mstorage.EmbedError(bucket, "", err)
+			return drivers.ObjectMetadata{}, resources, drivers.EmbedError(bucket, "", err)
 		}
 	}
 

pkg/drivers/file/file_object.go

@@ -28,136 +28,136 @@ import (
 	"encoding/gob"
 	"encoding/hex"
 
-	mstorage "github.com/minio-io/minio/pkg/storage"
+	"github.com/minio-io/minio/pkg/drivers"
 )
 
 /// Object Operations
 
 // GetPartialObject - GET object from range
-func (storage *Storage) GetPartialObject(w io.Writer, bucket, object string, start, length int64) (int64, error) {
+func (file *fileDriver) GetPartialObject(w io.Writer, bucket, object string, start, length int64) (int64, error) {
 	// validate bucket
-	if mstorage.IsValidBucket(bucket) == false {
-		return 0, mstorage.BucketNameInvalid{Bucket: bucket}
+	if drivers.IsValidBucket(bucket) == false {
+		return 0, drivers.BucketNameInvalid{Bucket: bucket}
 	}
 
 	// validate object
-	if mstorage.IsValidObject(object) == false {
-		return 0, mstorage.ObjectNameInvalid{Bucket: bucket, Object: object}
+	if drivers.IsValidObject(object) == false {
+		return 0, drivers.ObjectNameInvalid{Bucket: bucket, Object: object}
 	}
 
-	objectPath := path.Join(storage.root, bucket, object)
+	objectPath := path.Join(file.root, bucket, object)
 	filestat, err := os.Stat(objectPath)
 	switch err := err.(type) {
 	case nil:
 		{
 			if filestat.IsDir() {
-				return 0, mstorage.ObjectNotFound{Bucket: bucket, Object: object}
+				return 0, drivers.ObjectNotFound{Bucket: bucket, Object: object}
 			}
 		}
 	default:
 		{
 			if os.IsNotExist(err) {
-				return 0, mstorage.ObjectNotFound{Bucket: bucket, Object: object}
+				return 0, drivers.ObjectNotFound{Bucket: bucket, Object: object}
 			}
-			return 0, mstorage.EmbedError(bucket, object, err)
+			return 0, drivers.EmbedError(bucket, object, err)
 		}
 	}
-	file, err := os.Open(objectPath)
-	defer file.Close()
+	f, err := os.Open(objectPath)
+	defer f.Close()
 	if err != nil {
-		return 0, mstorage.EmbedError(bucket, object, err)
+		return 0, drivers.EmbedError(bucket, object, err)
 	}
 
-	_, err = file.Seek(start, os.SEEK_SET)
+	_, err = f.Seek(start, os.SEEK_SET)
 	if err != nil {
-		return 0, mstorage.EmbedError(bucket, object, err)
+		return 0, drivers.EmbedError(bucket, object, err)
 	}
 
-	count, err := io.CopyN(w, file, length)
+	count, err := io.CopyN(w, f, length)
 	if err != nil {
-		return count, mstorage.EmbedError(bucket, object, err)
+		return count, drivers.EmbedError(bucket, object, err)
 	}
 
 	return count, nil
 }
 
 // GetObject - GET object from key
-func (storage *Storage) GetObject(w io.Writer, bucket string, object string) (int64, error) {
+func (file *fileDriver) GetObject(w io.Writer, bucket string, object string) (int64, error) {
 	// validate bucket
-	if mstorage.IsValidBucket(bucket) == false {
-		return 0, mstorage.BucketNameInvalid{Bucket: bucket}
+	if drivers.IsValidBucket(bucket) == false {
+		return 0, drivers.BucketNameInvalid{Bucket: bucket}
 	}
 
 	// validate object
-	if mstorage.IsValidObject(object) == false {
-		return 0, mstorage.ObjectNameInvalid{Bucket: bucket, Object: object}
+	if drivers.IsValidObject(object) == false {
+		return 0, drivers.ObjectNameInvalid{Bucket: bucket, Object: object}
 	}
 
-	objectPath := path.Join(storage.root, bucket, object)
+	objectPath := path.Join(file.root, bucket, object)
 
 	filestat, err := os.Stat(objectPath)
 	switch err := err.(type) {
 	case nil:
 		{
 			if filestat.IsDir() {
-				return 0, mstorage.ObjectNotFound{Bucket: bucket, Object: object}
+				return 0, drivers.ObjectNotFound{Bucket: bucket, Object: object}
 			}
 		}
 	default:
 		{
 			if os.IsNotExist(err) {
-				return 0, mstorage.ObjectNotFound{Bucket: bucket, Object: object}
+				return 0, drivers.ObjectNotFound{Bucket: bucket, Object: object}
 			}
-			return 0, mstorage.EmbedError(bucket, object, err)
+			return 0, drivers.EmbedError(bucket, object, err)
 		}
 	}
-	file, err := os.Open(objectPath)
-	defer file.Close()
+	f, err := os.Open(objectPath)
+	defer f.Close()
 	if err != nil {
-		return 0, mstorage.EmbedError(bucket, object, err)
+		return 0, drivers.EmbedError(bucket, object, err)
 	}
 
-	count, err := io.Copy(w, file)
+	count, err := io.Copy(w, f)
 	if err != nil {
-		return count, mstorage.EmbedError(bucket, object, err)
+		return count, drivers.EmbedError(bucket, object, err)
 	}
 	return count, nil
 }
 
 // GetObjectMetadata - HEAD object
-func (storage *Storage) GetObjectMetadata(bucket, object, prefix string) (mstorage.ObjectMetadata, error) {
-	if mstorage.IsValidBucket(bucket) == false {
-		return mstorage.ObjectMetadata{}, mstorage.BucketNameInvalid{Bucket: bucket}
+func (file *fileDriver) GetObjectMetadata(bucket, object, prefix string) (drivers.ObjectMetadata, error) {
+	if drivers.IsValidBucket(bucket) == false {
+		return drivers.ObjectMetadata{}, drivers.BucketNameInvalid{Bucket: bucket}
 	}
 
-	if mstorage.IsValidObject(object) == false {
-		return mstorage.ObjectMetadata{}, mstorage.ObjectNameInvalid{Bucket: bucket, Object: bucket}
+	if drivers.IsValidObject(object) == false {
+		return drivers.ObjectMetadata{}, drivers.ObjectNameInvalid{Bucket: bucket, Object: bucket}
 	}
 
 	// Do not use path.Join() since path.Join strips off any object names with '/', use them as is
 	// in a static manner so that we can send a proper 'ObjectNotFound' reply back upon os.Stat()
-	objectPath := storage.root + "/" + bucket + "/" + object
+	objectPath := file.root + "/" + bucket + "/" + object
 	stat, err := os.Stat(objectPath)
 	if os.IsNotExist(err) {
-		return mstorage.ObjectMetadata{}, mstorage.ObjectNotFound{Bucket: bucket, Object: object}
+		return drivers.ObjectMetadata{}, drivers.ObjectNotFound{Bucket: bucket, Object: object}
 	}
 
 	_, err = os.Stat(objectPath + "$metadata")
 	if os.IsNotExist(err) {
-		return mstorage.ObjectMetadata{}, mstorage.ObjectNotFound{Bucket: bucket, Object: object}
+		return drivers.ObjectMetadata{}, drivers.ObjectNotFound{Bucket: bucket, Object: object}
 	}
 
-	file, err := os.Open(objectPath + "$metadata")
-	defer file.Close()
+	f, err := os.Open(objectPath + "$metadata")
+	defer f.Close()
 	if err != nil {
-		return mstorage.ObjectMetadata{}, mstorage.EmbedError(bucket, object, err)
+		return drivers.ObjectMetadata{}, drivers.EmbedError(bucket, object, err)
 	}
 
-	var deserializedMetadata Metadata
-	decoder := gob.NewDecoder(file)
+	var deserializedMetadata fileMetadata
+	decoder := gob.NewDecoder(f)
 	err = decoder.Decode(&deserializedMetadata)
 	if err != nil {
-		return mstorage.ObjectMetadata{}, mstorage.EmbedError(bucket, object, err)
+		return drivers.ObjectMetadata{}, drivers.EmbedError(bucket, object, err)
 	}
 
 	contentType := "application/octet-stream"
@@ -171,7 +171,7 @@ func (storage *Storage) GetObjectMetadata(bucket, object, prefix string) (mstora
 		etag = hex.EncodeToString(deserializedMetadata.Md5sum)
 	}
 	trimmedObject := strings.TrimPrefix(object, prefix)
-	metadata := mstorage.ObjectMetadata{
+	metadata := drivers.ObjectMetadata{
 		Bucket:      bucket,
 		Key:         trimmedObject,
 		Created:     stat.ModTime(),
@@ -184,24 +184,24 @@ func (storage *Storage) GetObjectMetadata(bucket, object, prefix string) (mstora
 }
 
 // CreateObject - PUT object
-func (storage *Storage) CreateObject(bucket, key, contentType, md5sum string, data io.Reader) error {
+func (file *fileDriver) CreateObject(bucket, key, contentType, md5sum string, data io.Reader) error {
 	// TODO Commits should stage then move instead of writing directly
-	storage.lock.Lock()
-	defer storage.lock.Unlock()
+	file.lock.Lock()
+	defer file.lock.Unlock()
 
 	// check bucket name valid
-	if mstorage.IsValidBucket(bucket) == false {
-		return mstorage.BucketNameInvalid{Bucket: bucket}
+	if drivers.IsValidBucket(bucket) == false {
+		return drivers.BucketNameInvalid{Bucket: bucket}
 	}
 
 	// check bucket exists
-	if _, err := os.Stat(path.Join(storage.root, bucket)); os.IsNotExist(err) {
-		return mstorage.BucketNotFound{Bucket: bucket}
+	if _, err := os.Stat(path.Join(file.root, bucket)); os.IsNotExist(err) {
+		return drivers.BucketNotFound{Bucket: bucket}
 	}
 
 	// verify object path legal
-	if mstorage.IsValidObject(key) == false {
-		return mstorage.ObjectNameInvalid{Bucket: bucket, Object: key}
+	if drivers.IsValidObject(key) == false {
+		return drivers.ObjectNameInvalid{Bucket: bucket, Object: key}
 	}
 
 	// verify content type
@@ -211,54 +211,54 @@ func (storage *Storage) CreateObject(bucket, key, contentType, md5sum string, da
 	contentType = strings.TrimSpace(contentType)
 
 	// get object path
-	objectPath := path.Join(storage.root, bucket, key)
+	objectPath := path.Join(file.root, bucket, key)
 	objectDir := path.Dir(objectPath)
 	if _, err := os.Stat(objectDir); os.IsNotExist(err) {
 		err = os.MkdirAll(objectDir, 0700)
 		if err != nil {
-			return mstorage.EmbedError(bucket, key, err)
+			return drivers.EmbedError(bucket, key, err)
 		}
 	}
 
 	// check if object exists
 	if _, err := os.Stat(objectPath); !os.IsNotExist(err) {
-		return mstorage.ObjectExists{
+		return drivers.ObjectExists{
 			Bucket: bucket,
 			Object: key,
 		}
 	}
 
 	// write object
-	file, err := os.OpenFile(objectPath, os.O_WRONLY|os.O_CREATE, 0600)
-	defer file.Close()
+	f, err := os.OpenFile(objectPath, os.O_WRONLY|os.O_CREATE, 0600)
+	defer f.Close()
 	if err != nil {
-		return mstorage.EmbedError(bucket, key, err)
+		return drivers.EmbedError(bucket, key, err)
 	}
 
 	h := md5.New()
-	mw := io.MultiWriter(file, h)
+	mw := io.MultiWriter(f, h)
 
 	_, err = io.Copy(mw, data)
 	if err != nil {
-		return mstorage.EmbedError(bucket, key, err)
+		return drivers.EmbedError(bucket, key, err)
 	}
 
 	//
-	file, err = os.OpenFile(objectPath+"$metadata", os.O_WRONLY|os.O_CREATE, 0600)
-	defer file.Close()
+	f, err = os.OpenFile(objectPath+"$metadata", os.O_WRONLY|os.O_CREATE, 0600)
+	defer f.Close()
 	if err != nil {
-		return mstorage.EmbedError(bucket, key, err)
+		return drivers.EmbedError(bucket, key, err)
 	}
 
-	metadata := &Metadata{
+	metadata := &fileMetadata{
 		ContentType: contentType,
 		Md5sum:      h.Sum(nil),
 	}
 	// serialize metadata to gob
-	encoder := gob.NewEncoder(file)
+	encoder := gob.NewEncoder(f)
 	err = encoder.Encode(metadata)
 	if err != nil {
-		return mstorage.EmbedError(bucket, key, err)
+		return drivers.EmbedError(bucket, key, err)
 	}
 
 	// Verify data received to be correct, Content-MD5 received
@@ -266,10 +266,10 @@ func (storage *Storage) CreateObject(bucket, key, contentType, md5sum string, da
 		var data []byte
 		data, err = base64.StdEncoding.DecodeString(md5sum)
 		if err != nil {
-			return mstorage.InvalidDigest{Bucket: bucket, Key: key, Md5: md5sum}
+			return drivers.InvalidDigest{Bucket: bucket, Key: key, Md5: md5sum}
 		}
 		if !bytes.Equal(metadata.Md5sum, data) {
-			return mstorage.BadDigest{Bucket: bucket, Key: key, Md5: md5sum}
+			return drivers.BadDigest{Bucket: bucket, Key: key, Md5: md5sum}
 		}
 	}
 	return nil

pkg/drivers/file/file_policy.go

@@ -0,0 +1,111 @@
+/*
+ * Minimalist Object Storage, (C) 2015 Minio, 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,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package file
+
+import (
+	"os"
+	"path"
+
+	"encoding/json"
+	"github.com/minio-io/minio/pkg/drivers"
+)
+
+// GetBucketPolicy - GET bucket policy
+func (file *fileDriver) GetBucketPolicy(bucket string) (drivers.BucketPolicy, error) {
+	file.lock.Lock()
+	defer file.lock.Unlock()
+
+	var p drivers.BucketPolicy
+	// verify bucket path legal
+	if drivers.IsValidBucket(bucket) == false {
+		return drivers.BucketPolicy{}, drivers.BucketNameInvalid{Bucket: bucket}
+	}
+
+	// get bucket path
+	bucketDir := path.Join(file.root, bucket)
+	// check if bucket exists
+	if _, err := os.Stat(bucketDir); err != nil {
+		return drivers.BucketPolicy{}, drivers.BucketNotFound{Bucket: bucket}
+	}
+
+	// get policy path
+	bucketPolicy := path.Join(file.root, bucket+"_policy.json")
+	filestat, err := os.Stat(bucketPolicy)
+
+	if os.IsNotExist(err) {
+		return drivers.BucketPolicy{}, drivers.BucketPolicyNotFound{Bucket: bucket}
+	}
+
+	if filestat.IsDir() {
+		return drivers.BucketPolicy{}, drivers.BackendCorrupted{Path: bucketPolicy}
+	}
+
+	f, err := os.OpenFile(bucketPolicy, os.O_RDONLY, 0666)
+	defer f.Close()
+	if err != nil {
+		return drivers.BucketPolicy{}, drivers.EmbedError(bucket, "", err)
+	}
+	encoder := json.NewDecoder(f)
+	err = encoder.Decode(&p)
+	if err != nil {
+		return drivers.BucketPolicy{}, drivers.EmbedError(bucket, "", err)
+	}
+
+	return p, nil
+
+}
+
+// CreateBucketPolicy - PUT bucket policy
+func (file *fileDriver) CreateBucketPolicy(bucket string, p drivers.BucketPolicy) error {
+	file.lock.Lock()
+	defer file.lock.Unlock()
+
+	// verify bucket path legal
+	if drivers.IsValidBucket(bucket) == false {
+		return drivers.BucketNameInvalid{Bucket: bucket}
+	}
+
+	// get bucket path
+	bucketDir := path.Join(file.root, bucket)
+	// check if bucket exists
+	if _, err := os.Stat(bucketDir); err != nil {
+		return drivers.BucketNotFound{
+			Bucket: bucket,
+		}
+	}
+
+	// get policy path
+	bucketPolicy := path.Join(file.root, bucket+"_policy.json")
+	filestat, ret := os.Stat(bucketPolicy)
+	if !os.IsNotExist(ret) {
+		if filestat.IsDir() {
+			return drivers.BackendCorrupted{Path: bucketPolicy}
+		}
+	}
+
+	f, err := os.OpenFile(bucketPolicy, os.O_WRONLY|os.O_CREATE, 0600)
+	defer f.Close()
+	if err != nil {
+		return drivers.EmbedError(bucket, "", err)
+	}
+	encoder := json.NewEncoder(f)
+	err = encoder.Encode(p)
+	if err != nil {
+		return drivers.EmbedError(bucket, "", err)
+	}
+	return nil
+}

pkg/drivers/file/file_test.go

@@ -21,7 +21,7 @@ import (
 	"os"
 	"testing"
 
-	mstorage "github.com/minio-io/minio/pkg/storage"
+	"github.com/minio-io/minio/pkg/drivers"
 
 	. "gopkg.in/check.v1"
 )
@@ -34,14 +34,14 @@ var _ = Suite(&MySuite{})
 
 func (s *MySuite) TestAPISuite(c *C) {
 	var storageList []string
-	create := func() mstorage.Storage {
+	create := func() drivers.Driver {
 		path, err := ioutil.TempDir(os.TempDir(), "minio-file-")
 		c.Check(err, IsNil)
 		storageList = append(storageList, path)
 		_, _, store := Start(path)
 		return store
 	}
-	mstorage.APITestSuite(c, create)
+	drivers.APITestSuite(c, create)
 	removeRoots(c, storageList)
 }
 

pkg/drivers/memory/memory.go

@@ -1,5 +1,5 @@
 /*
- * Minio Object Storage, (C) 2015 Minio, Inc.
+ * Minimalist Object Storage, (C) 2015 Minio, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,7 +19,6 @@ package memory
 import (
 	"bufio"
 	"bytes"
-	"fmt"
 	"io"
 	"sort"
 	"strings"
@@ -28,37 +27,40 @@ import (
 
 	"crypto/md5"
 	"encoding/hex"
-	mstorage "github.com/minio-io/minio/pkg/storage"
+
+	"github.com/minio-io/minio/pkg/drivers"
 )
 
-// Storage - local variables
-type Storage struct {
+// memoryDriver - local variables
+type memoryDriver struct {
 	bucketdata map[string]storedBucket
 	objectdata map[string]storedObject
 	lock       *sync.RWMutex
 }
 
 type storedBucket struct {
-	metadata mstorage.BucketMetadata
+	metadata drivers.BucketMetadata
 	//	owner    string // TODO
 	//	id       string // TODO
 }
 
 type storedObject struct {
-	metadata mstorage.ObjectMetadata
+	metadata drivers.ObjectMetadata
 	data     []byte
 }
 
 // Start memory object server
-func Start() (chan<- string, <-chan error, *Storage) {
+func Start() (chan<- string, <-chan error, drivers.Driver) {
 	ctrlChannel := make(chan string)
 	errorChannel := make(chan error)
+
+	memory := new(memoryDriver)
+	memory.bucketdata = make(map[string]storedBucket)
+	memory.objectdata = make(map[string]storedObject)
+	memory.lock = new(sync.RWMutex)
+
 	go start(ctrlChannel, errorChannel)
-	return ctrlChannel, errorChannel, &Storage{
-		bucketdata: make(map[string]storedBucket),
-		objectdata: make(map[string]storedObject),
-		lock:       new(sync.RWMutex),
-	}
+	return ctrlChannel, errorChannel, memory
 }
 
 func start(ctrlChannel <-chan string, errorChannel chan<- error) {
@@ -66,43 +68,43 @@ func start(ctrlChannel <-chan string, errorChannel chan<- error) {
 }
 
 // GetObject - GET object from memory buffer
-func (storage *Storage) GetObject(w io.Writer, bucket string, object string) (int64, error) {
+func (memory memoryDriver) GetObject(w io.Writer, bucket string, object string) (int64, error) {
 	// get object
 	key := object
-	if val, ok := storage.objectdata[key]; ok {
+	if val, ok := memory.objectdata[key]; ok {
 		objectBuffer := bytes.NewBuffer(val.data)
 		written, err := io.Copy(w, objectBuffer)
 		return written, err
 	}
-	return 0, mstorage.ObjectNotFound{Bucket: bucket, Object: object}
+	return 0, drivers.ObjectNotFound{Bucket: bucket, Object: object}
 }
 
 // GetPartialObject - GET object from memory buffer range
-func (storage *Storage) GetPartialObject(w io.Writer, bucket, object string, start, end int64) (int64, error) {
-	return 0, mstorage.APINotImplemented{API: "GetPartialObject"}
+func (memory memoryDriver) GetPartialObject(w io.Writer, bucket, object string, start, end int64) (int64, error) {
+	return 0, drivers.APINotImplemented{API: "GetPartialObject"}
 }
 
 // CreateBucketPolicy - Not implemented
-func (storage *Storage) CreateBucketPolicy(bucket string, policy mstorage.BucketPolicy) error {
-	return mstorage.APINotImplemented{API: "PutBucketPolicy"}
+func (memory memoryDriver) CreateBucketPolicy(bucket string, policy drivers.BucketPolicy) error {
+	return drivers.APINotImplemented{API: "PutBucketPolicy"}
 }
 
 // GetBucketPolicy - Not implemented
-func (storage *Storage) GetBucketPolicy(bucket string) (mstorage.BucketPolicy, error) {
-	return mstorage.BucketPolicy{}, mstorage.APINotImplemented{API: "GetBucketPolicy"}
+func (memory memoryDriver) GetBucketPolicy(bucket string) (drivers.BucketPolicy, error) {
+	return drivers.BucketPolicy{}, drivers.APINotImplemented{API: "GetBucketPolicy"}
 }
 
 // CreateObject - PUT object to memory buffer
-func (storage *Storage) CreateObject(bucket, key, contentType, md5sum string, data io.Reader) error {
-	storage.lock.Lock()
-	defer storage.lock.Unlock()
+func (memory memoryDriver) CreateObject(bucket, key, contentType, md5sum string, data io.Reader) error {
+	memory.lock.Lock()
+	defer memory.lock.Unlock()
 
-	if _, ok := storage.bucketdata[bucket]; ok == false {
-		return mstorage.BucketNotFound{Bucket: bucket}
+	if _, ok := memory.bucketdata[bucket]; ok == false {
+		return drivers.BucketNotFound{Bucket: bucket}
 	}
 
-	if _, ok := storage.objectdata[key]; ok == true {
-		return mstorage.ObjectExists{Bucket: bucket, Object: key}
+	if _, ok := memory.objectdata[key]; ok == true {
+		return drivers.ObjectExists{Bucket: bucket, Object: key}
 	}
 
 	if contentType == "" {
@@ -117,7 +119,7 @@ func (storage *Storage) CreateObject(bucket, key, contentType, md5sum string, da
 		size := bytesBuffer.Len()
 		md5SumBytes := md5.Sum(bytesBuffer.Bytes())
 		md5Sum := hex.EncodeToString(md5SumBytes[:])
-		newObject.metadata = mstorage.ObjectMetadata{
+		newObject.metadata = drivers.ObjectMetadata{
 			Bucket: bucket,
 			Key:    key,
 
@@ -128,27 +130,27 @@ func (storage *Storage) CreateObject(bucket, key, contentType, md5sum string, da
 		}
 		newObject.data = bytesBuffer.Bytes()
 	}
-	storage.objectdata[key] = newObject
+	memory.objectdata[key] = newObject
 	return nil
 }
 
 // CreateBucket - create bucket in memory
-func (storage *Storage) CreateBucket(bucketName string) error {
-	storage.lock.Lock()
-	defer storage.lock.Unlock()
-	if !mstorage.IsValidBucket(bucketName) {
-		return mstorage.BucketNameInvalid{Bucket: bucketName}
+func (memory memoryDriver) CreateBucket(bucketName string) error {
+	memory.lock.Lock()
+	defer memory.lock.Unlock()
+	if !drivers.IsValidBucket(bucketName) {
+		return drivers.BucketNameInvalid{Bucket: bucketName}
 	}
 
-	if _, ok := storage.bucketdata[bucketName]; ok == true {
-		return mstorage.BucketExists{Bucket: bucketName}
+	if _, ok := memory.bucketdata[bucketName]; ok == true {
+		return drivers.BucketExists{Bucket: bucketName}
 	}
 
 	var newBucket = storedBucket{}
-	newBucket.metadata = mstorage.BucketMetadata{}
+	newBucket.metadata = drivers.BucketMetadata{}
 	newBucket.metadata.Name = bucketName
 	newBucket.metadata.Created = time.Now()
-	storage.bucketdata[bucketName] = newBucket
+	memory.bucketdata[bucketName] = newBucket
 
 	return nil
 }
@@ -172,13 +174,13 @@ func appendUniq(slice []string, i string) []string {
 }
 
 // ListObjects - list objects from memory
-func (storage *Storage) ListObjects(bucket string, resources mstorage.BucketResourcesMetadata) ([]mstorage.ObjectMetadata, mstorage.BucketResourcesMetadata, error) {
-	if _, ok := storage.bucketdata[bucket]; ok == false {
-		return []mstorage.ObjectMetadata{}, mstorage.BucketResourcesMetadata{IsTruncated: false}, mstorage.BucketNotFound{Bucket: bucket}
+func (memory memoryDriver) ListObjects(bucket string, resources drivers.BucketResourcesMetadata) ([]drivers.ObjectMetadata, drivers.BucketResourcesMetadata, error) {
+	if _, ok := memory.bucketdata[bucket]; ok == false {
+		return []drivers.ObjectMetadata{}, drivers.BucketResourcesMetadata{IsTruncated: false}, drivers.BucketNotFound{Bucket: bucket}
 	}
-	var results []mstorage.ObjectMetadata
+	var results []drivers.ObjectMetadata
 	var keys []string
-	for key := range storage.objectdata {
+	for key := range memory.objectdata {
 		switch true {
 		// Prefix absent, delimit object key based on delimiter
 		case resources.Delimiter != "" && resources.Prefix == "":
@@ -193,7 +195,6 @@ func (storage *Storage) ListObjects(bucket string, resources mstorage.BucketReso
 		case resources.Delimiter != "" && resources.Prefix != "" && strings.HasPrefix(key, resources.Prefix):
 			trimmedName := strings.TrimPrefix(key, resources.Prefix)
 			delimitedName := delimiter(trimmedName, resources.Delimiter)
-			fmt.Println(trimmedName, delimitedName, key, resources.Prefix)
 			switch true {
 			case key == resources.Prefix:
 				keys = appendUniq(keys, key)
@@ -219,9 +220,9 @@ func (storage *Storage) ListObjects(bucket string, resources mstorage.BucketReso
 	sort.Strings(keys)
 	for _, key := range keys {
 		if len(results) == resources.Maxkeys {
-			return results, mstorage.BucketResourcesMetadata{IsTruncated: true}, nil
+			return results, drivers.BucketResourcesMetadata{IsTruncated: true}, nil
 		}
-		object := storage.objectdata[key]
+		object := memory.objectdata[key]
 		if bucket == object.metadata.Bucket {
 			results = append(results, object.metadata)
 		}
@@ -230,7 +231,7 @@ func (storage *Storage) ListObjects(bucket string, resources mstorage.BucketReso
 }
 
 // ByBucketName is a type for sorting bucket metadata by bucket name
-type ByBucketName []mstorage.BucketMetadata
+type ByBucketName []drivers.BucketMetadata
 
 // Len of bucket name
 func (b ByBucketName) Len() int { return len(b) }
@@ -242,9 +243,9 @@ func (b ByBucketName) Swap(i, j int) { b[i], b[j] = b[j], b[i] }
 func (b ByBucketName) Less(i, j int) bool { return b[i].Name < b[j].Name }
 
 // ListBuckets - List buckets from memory
-func (storage *Storage) ListBuckets() ([]mstorage.BucketMetadata, error) {
-	var results []mstorage.BucketMetadata
-	for _, bucket := range storage.bucketdata {
+func (memory memoryDriver) ListBuckets() ([]drivers.BucketMetadata, error) {
+	var results []drivers.BucketMetadata
+	for _, bucket := range memory.bucketdata {
 		results = append(results, bucket.metadata)
 	}
 	sort.Sort(ByBucketName(results))
@@ -252,9 +253,9 @@ func (storage *Storage) ListBuckets() ([]mstorage.BucketMetadata, error) {
 }
 
 // GetObjectMetadata - get object metadata from memory
-func (storage *Storage) GetObjectMetadata(bucket, key, prefix string) (mstorage.ObjectMetadata, error) {
-	if object, ok := storage.objectdata[key]; ok == true {
+func (memory memoryDriver) GetObjectMetadata(bucket, key, prefix string) (drivers.ObjectMetadata, error) {
+	if object, ok := memory.objectdata[key]; ok == true {
 		return object.metadata, nil
 	}
-	return mstorage.ObjectMetadata{}, mstorage.ObjectNotFound{Bucket: bucket, Object: key}
+	return drivers.ObjectMetadata{}, drivers.ObjectNotFound{Bucket: bucket, Object: key}
 }

pkg/drivers/memory/memory_test.go

@@ -19,7 +19,7 @@ package memory
 import (
 	"testing"
 
-	mstorage "github.com/minio-io/minio/pkg/storage"
+	"github.com/minio-io/minio/pkg/drivers"
 
 	. "gopkg.in/check.v1"
 )
@@ -31,10 +31,9 @@ type MySuite struct{}
 var _ = Suite(&MySuite{})
 
 func (s *MySuite) TestAPISuite(c *C) {
-	create := func() mstorage.Storage {
+	create := func() drivers.Driver {
 		_, _, store := Start()
 		return store
 	}
-
-	mstorage.APITestSuite(c, create)
+	drivers.APITestSuite(c, create)
 }

pkg/encoding/erasure/ctypes.go

@@ -24,7 +24,7 @@ import (
 )
 
 // Integer to Int conversion
-func int2cInt(src_err_list []int) *C.int32_t {
+func int2CInt(src_err_list []int) *C.int32_t {
 	var sizeErrInt = int(unsafe.Sizeof(src_err_list[0]))
 	switch sizeInt {
 	case sizeErrInt:

pkg/encoding/erasure/erasure_decode.go

@@ -32,47 +32,47 @@ import (
 //
 // Decoded data is exactly similar in length and content as the original data.
 func (e *Encoder) Decode(chunks [][]byte, length int) ([]byte, error) {
-	var decode_matrix *C.uint8_t
-	var decode_tbls *C.uint8_t
-	var decode_index *C.uint32_t
+	var decodeMatrix *C.uint8_t
+	var decodeTbls *C.uint8_t
+	var decodeIndex *C.uint32_t
 	var source, target **C.uint8_t
 
-	k := e.params.K
-	m := e.params.M
+	k := int(e.params.K)
+	m := int(e.params.M)
 	n := k + m
-	if len(chunks) != int(n) {
+	if len(chunks) != n {
 		return nil, errors.New(fmt.Sprintf("chunks length must be %d", n))
 	}
-	chunk_size := GetEncodedChunkLen(length, uint8(k))
+	chunkLen := GetEncodedBlockLen(length, uint8(k))
 
-	error_index := make([]int, n+1)
-	var err_count int = 0
+	errorIndex := make([]int, n+1)
+	var errCount int = 0
 
 	for i := range chunks {
 		// Check of chunks are really null
 		if chunks[i] == nil || len(chunks[i]) == 0 {
-			error_index[err_count] = i
-			err_count++
+			errorIndex[errCount] = i
+			errCount++
 		}
 	}
-	error_index[err_count] = -1
-	err_count++
+	errorIndex[errCount] = -1
+	errCount++
 
 	// Too many missing chunks, cannot be more than parity `m`
-	if err_count-1 > int(n-k) {
+	if errCount-1 > int(n-k) {
 		return nil, errors.New("too many erasures requested, can't decode")
 	}
 
-	error_index_ptr := int2cInt(error_index[:err_count])
+	errorIndex_ptr := int2CInt(errorIndex[:errCount])
 
 	for i := range chunks {
 		if chunks[i] == nil || len(chunks[i]) == 0 {
-			chunks[i] = make([]byte, chunk_size)
+			chunks[i] = make([]byte, chunkLen)
 		}
 	}
 
-	C.minio_init_decoder(error_index_ptr, C.int(k), C.int(n), C.int(err_count-1),
-		e.encode_matrix, &decode_matrix, &decode_tbls, &decode_index)
+	C.minio_init_decoder(errorIndex_ptr, C.int(k), C.int(n), C.int(errCount-1),
+		e.encodeMatrix, &decodeMatrix, &decodeTbls, &decodeIndex)
 
 	pointers := make([]*byte, n)
 	for i := range chunks {
@@ -81,24 +81,24 @@ func (e *Encoder) Decode(chunks [][]byte, length int) ([]byte, error) {
 
 	data := (**C.uint8_t)(unsafe.Pointer(&pointers[0]))
 
-	ret := C.minio_get_source_target(C.int(err_count-1), C.int(k), C.int(m), error_index_ptr,
-		decode_index, data, &source, &target)
+	ret := C.minio_get_source_target(C.int(errCount-1), C.int(k), C.int(m), errorIndex_ptr,
+		decodeIndex, data, &source, &target)
 
 	if int(ret) == -1 {
 		return nil, errors.New("Decoding source target failed")
 	}
 
-	C.ec_encode_data(C.int(chunk_size), C.int(k), C.int(err_count-1), decode_tbls,
+	C.ec_encode_data(C.int(chunkLen), C.int(k), C.int(errCount-1), decodeTbls,
 		source, target)
 
-	recovered_output := make([]byte, 0, chunk_size*int(k))
+	recoveredOutput := make([]byte, 0, chunkLen*int(k))
 	for i := 0; i < int(k); i++ {
-		recovered_output = append(recovered_output, chunks[i]...)
+		recoveredOutput = append(recoveredOutput, chunks[i]...)
 	}
 
 	// TODO cache this if necessary
-	e.decode_matrix = decode_matrix
-	e.decode_tbls = decode_tbls
+	e.decodeMatrix = decodeMatrix
+	e.decodeTbls = decodeTbls
 
-	return recovered_output[:length], nil
+	return recoveredOutput[:length], nil
 }

pkg/encoding/erasure/erasure_encode.go

@@ -26,11 +26,12 @@ import (
 	"unsafe"
 )
 
-type Technique int
+type Technique uint8
 
 const (
 	Vandermonde Technique = iota
 	Cauchy
+	None
 )
 
 const (
@@ -52,10 +53,10 @@ type EncoderParams struct {
 // Encoder is an object used to encode and decode data.
 type Encoder struct {
 	params *EncoderParams
-	encode_matrix,
-	encode_tbls,
-	decode_matrix,
-	decode_tbls *C.uint8_t
+	encodeMatrix,
+	encodeTbls,
+	decodeMatrix,
+	decodeTbls *C.uint8_t
 }
 
 // ParseEncoderParams creates an EncoderParams object.
@@ -94,30 +95,30 @@ func ParseEncoderParams(k, m uint8, technique Technique) (*EncoderParams, error)
 
 // NewEncoder creates an encoder object with a given set of parameters.
 func NewEncoder(ep *EncoderParams) *Encoder {
-	var encode_matrix *C.uint8_t
-	var encode_tbls *C.uint8_t
+	var k = C.int(ep.K)
+	var m = C.int(ep.M)
 
-	k := C.int(ep.K)
-	m := C.int(ep.M)
+	var encodeMatrix *C.uint8_t
+	var encodeTbls *C.uint8_t
 
-	C.minio_init_encoder(C.int(ep.Technique), k, m, &encode_matrix,
-		&encode_tbls)
+	C.minio_init_encoder(C.int(ep.Technique), k, m, &encodeMatrix,
+		&encodeTbls)
 
 	return &Encoder{
-		params:        ep,
-		encode_matrix: encode_matrix,
-		encode_tbls:   encode_tbls,
-		decode_matrix: nil,
-		decode_tbls:   nil,
+		params:       ep,
+		encodeMatrix: encodeMatrix,
+		encodeTbls:   encodeTbls,
+		decodeMatrix: nil,
+		decodeTbls:   nil,
 	}
 }
 
-func GetEncodedLen(inputLen int, k, m uint8) (outputLen int) {
-	outputLen = GetEncodedChunkLen(inputLen, k) * int(k+m)
+func GetEncodedBlocksLen(inputLen int, k, m uint8) (outputLen int) {
+	outputLen = GetEncodedBlockLen(inputLen, k) * int(k+m)
 	return outputLen
 }
 
-func GetEncodedChunkLen(inputLen int, k uint8) (outputChunkLen int) {
+func GetEncodedBlockLen(inputLen int, k uint8) (encodedOutputLen int) {
 	alignment := int(k) * SIMDAlign
 	remainder := inputLen % alignment
 
@@ -125,55 +126,66 @@ func GetEncodedChunkLen(inputLen int, k uint8) (outputChunkLen int) {
 	if remainder != 0 {
 		paddedInputLen = inputLen + (alignment - remainder)
 	}
-	outputChunkLen = paddedInputLen / int(k)
-	return outputChunkLen
+	encodedOutputLen = paddedInputLen / int(k)
+	return encodedOutputLen
 }
 
-// Encode encodes a block of data. The input is the original data. The output
-// is a 2 tuple containing (k + m) chunks of erasure encoded data and the
-// length of the original object.
-func (e *Encoder) Encode(input []byte) ([][]byte, error) {
-	inputLen := len(input)
-	k := C.int(e.params.K)
-	m := C.int(e.params.M)
-	n := k + m
+// Encode erasure codes a block of data in "k" data blocks and "m" parity blocks.
+// Output is [k+m][]blocks of data and parity slices.
+func (e *Encoder) Encode(inputData []byte) (encodedBlocks [][]byte, err error) {
+	k := int(e.params.K) // "k" data blocks
+	m := int(e.params.M) // "m" parity blocks
+	n := k + m           // "n" total encoded blocks
 
-	chunkLen := GetEncodedChunkLen(inputLen, e.params.K)
-	encodedDataLen := chunkLen * int(k)
-	paddedDataLen := int(encodedDataLen) - inputLen
+	// Length of a single encoded chunk.
+	// Total number of encoded chunks = "k" data  + "m" parity blocks
+	encodedBlockLen := GetEncodedBlockLen(len(inputData), uint8(k))
 
-	if paddedDataLen > 0 {
-		s := make([]byte, paddedDataLen)
+	// Length of total number of "k" data chunks
+	encodedDataBlocksLen := encodedBlockLen * k
+
+	// Length of extra padding required for the data blocks.
+	encodedDataBlocksPadLen := encodedDataBlocksLen - len(inputData)
+
+	// Extend inputData buffer to accommodate coded data blocks if necesssary
+	if encodedDataBlocksPadLen > 0 {
+		padding := make([]byte, encodedDataBlocksPadLen)
 		// Expand with new padded blocks to the byte array
-		input = append(input, s...)
+		inputData = append(inputData, padding...)
 	}
 
-	encodedParityLen := chunkLen * int(e.params.M)
-	c := make([]byte, encodedParityLen)
-	input = append(input, c...)
-
-	// encodedOutLen := encodedDataLen + encodedParityLen
-
-	// Allocate chunks
-	chunks := make([][]byte, k+m)
-	pointers := make([]*byte, k+m)
-
-	var i int
-	// Add data blocks to chunks
-	for i = 0; i < int(k); i++ {
-		chunks[i] = input[i*chunkLen : (i+1)*chunkLen]
-		pointers[i] = &chunks[i][0]
+	// Extend inputData buffer to accommodate coded parity blocks
+	if true { // create a temporary scope to trigger garbage collect
+		encodedParityBlocksLen := encodedBlockLen * m
+		parityBlocks := make([]byte, encodedParityBlocksLen)
+		inputData = append(inputData, parityBlocks...)
 	}
 
-	for i = int(k); i < int(n); i++ {
-		chunks[i] = make([]byte, chunkLen)
-		pointers[i] = &chunks[i][0]
+	// Allocate memory to the "encoded blocks" return buffer
+	encodedBlocks = make([][]byte, n) // Return buffer
+
+	// Nessary to bridge Go to the C world. C requires 2D arry of pointers to
+	// byte array. "encodedBlocks" is a 2D slice.
+	pointersToEncodedBlock := make([]*byte, n) // Pointers to encoded blocks.
+
+	// Copy data block slices to encoded block buffer
+	for i := 0; i < k; i++ {
+		encodedBlocks[i] = inputData[i*encodedBlockLen : (i+1)*encodedBlockLen]
+		pointersToEncodedBlock[i] = &encodedBlocks[i][0]
 	}
 
-	data := (**C.uint8_t)(unsafe.Pointer(&pointers[:k][0]))
-	coding := (**C.uint8_t)(unsafe.Pointer(&pointers[k:][0]))
+	// Copy erasure block slices to encoded block buffer
+	for i := k; i < n; i++ {
+		encodedBlocks[i] = make([]byte, encodedBlockLen)
+		pointersToEncodedBlock[i] = &encodedBlocks[i][0]
+	}
 
-	C.ec_encode_data(C.int(chunkLen), k, m, e.encode_tbls, data,
-		coding)
-	return chunks, nil
+	// Erasure code the data into K data blocks and M parity
+	// blocks. Only the parity blocks are filled. Data blocks remain
+	// intact.
+	C.ec_encode_data(C.int(encodedBlockLen), C.int(k), C.int(m), e.encodeTbls,
+		(**C.uint8_t)(unsafe.Pointer(&pointersToEncodedBlock[:k][0])), // Pointers to data blocks
+		(**C.uint8_t)(unsafe.Pointer(&pointersToEncodedBlock[k:][0]))) // Pointers to parity blocks
+
+	return encodedBlocks, nil
 }

pkg/server/server.go

@@ -24,11 +24,11 @@ import (
 
 	"github.com/minio-io/minio/pkg/api"
 	"github.com/minio-io/minio/pkg/api/web"
+	"github.com/minio-io/minio/pkg/drivers"
+	"github.com/minio-io/minio/pkg/drivers/donut"
+	"github.com/minio-io/minio/pkg/drivers/file"
+	"github.com/minio-io/minio/pkg/drivers/memory"
 	"github.com/minio-io/minio/pkg/server/httpserver"
-	mstorage "github.com/minio-io/minio/pkg/storage"
-	"github.com/minio-io/minio/pkg/storage/donutstorage"
-	"github.com/minio-io/minio/pkg/storage/file"
-	"github.com/minio-io/minio/pkg/storage/memory"
 )
 
 // Config - http server parameters
@@ -41,9 +41,9 @@ type Config struct {
 	APIType  interface{}
 }
 
-// MinioAPI - storage type donut, file, memory
+// MinioAPI - driver type donut, file, memory
 type MinioAPI struct {
-	StorageType StorageType
+	DriverType DriverType
 }
 
 // Web - web related
@@ -51,12 +51,12 @@ type Web struct {
 	Websocket bool // TODO
 }
 
-// StorageType - different storage types supported by minio
-type StorageType int
+// DriverType - different driver types supported by minio
+type DriverType int
 
-// Storage types
+// Driver types
 const (
-	Memory = iota
+	Memory DriverType = iota
 	File
 	Donut
 )
@@ -71,7 +71,7 @@ func getHTTPChannels(configs []Config) (ctrlChans []chan<- string, statusChans [
 		case MinioAPI:
 			{
 				// configure web server
-				var storage mstorage.Storage
+				var driver drivers.Driver
 				var httpConfig = httpserver.Config{}
 				httpConfig.Address = config.Address
 				httpConfig.Websocket = false
@@ -84,9 +84,9 @@ func getHTTPChannels(configs []Config) (ctrlChans []chan<- string, statusChans [
 					httpConfig.KeyFile = config.KeyFile
 				}
 
-				ctrlChans, statusChans, storage = getStorageChannels(k.StorageType)
-				// start minio api in a web server, pass storage driver into it
-				ctrlChan, statusChan, _ = httpserver.Start(api.HTTPHandler(config.Domain, storage), httpConfig)
+				ctrlChans, statusChans, driver = getDriverChannels(k.DriverType)
+				// start minio api in a web server, pass driver driver into it
+				ctrlChan, statusChan, _ = httpserver.Start(api.HTTPHandler(config.Domain, driver), httpConfig)
 
 				ctrlChans = append(ctrlChans, ctrlChan)
 				statusChans = append(statusChans, statusChan)
@@ -113,50 +113,50 @@ func getHTTPChannels(configs []Config) (ctrlChans []chan<- string, statusChans [
 	return
 }
 
-func getStorageChannels(storageType StorageType) (ctrlChans []chan<- string, statusChans []<-chan error, storage mstorage.Storage) {
+func getDriverChannels(driverType DriverType) (ctrlChans []chan<- string, statusChans []<-chan error, driver drivers.Driver) {
 	// a pair of control channels, we use these primarily to add to the lists above
 	var ctrlChan chan<- string
 	var statusChan <-chan error
 
-	// instantiate storage
+	// instantiate driver
 	// preconditions:
-	//    - storage type specified
-	//    - any configuration for storage is populated
+	//    - driver type specified
+	//    - any configuration for driver is populated
 	// postconditions:
-	//    - storage driver is initialized
-	//    - ctrlChans has channel to communicate to storage
-	//    - statusChans has channel for messages coming from storage
+	//    - driver driver is initialized
+	//    - ctrlChans has channel to communicate to driver
+	//    - statusChans has channel for messages coming from driver
 	switch {
-	case storageType == Memory:
+	case driverType == Memory:
 		{
-			ctrlChan, statusChan, storage = memory.Start()
+			ctrlChan, statusChan, driver = memory.Start()
 			ctrlChans = append(ctrlChans, ctrlChan)
 			statusChans = append(statusChans, statusChan)
 		}
-	case storageType == File:
+	case driverType == File:
 		{
 			u, err := user.Current()
 			if err != nil {
 				return nil, nil, nil
 			}
 			root := path.Join(u.HomeDir, "minio-storage", "file")
-			ctrlChan, statusChan, storage = file.Start(root)
+			ctrlChan, statusChan, driver = file.Start(root)
 			ctrlChans = append(ctrlChans, ctrlChan)
 			statusChans = append(statusChans, statusChan)
 		}
-	case storageType == Donut:
+	case driverType == Donut:
 		{
 			u, err := user.Current()
 			if err != nil {
 				return nil, nil, nil
 			}
-			root := path.Join(u.HomeDir, "minio-storage", "donut")
-			ctrlChan, statusChan, storage = donutstorage.Start(root)
+			root := path.Join(u.HomeDir, "minio-driver", "donut")
+			ctrlChan, statusChan, driver = donut.Start(root)
 			ctrlChans = append(ctrlChans, ctrlChan)
 			statusChans = append(statusChans, statusChan)
 		}
 	default: // should never happen
-		log.Fatal("No storage driver found")
+		log.Fatal("No driver found")
 	}
 	return
 }

pkg/storage/donut/bucket.go

@@ -6,11 +6,13 @@ import (
 	"strings"
 )
 
-type bucketDriver struct {
-	nodes []string
+type donutBucket struct {
+	nodes   []string
+	objects map[string][]byte
 }
 
-func (b bucketDriver) GetNodes() ([]string, error) {
+// GetNodes - get list of associated nodes for a given bucket
+func (b donutBucket) GetNodes() ([]string, error) {
 	var nodes []string
 	for _, node := range b.nodes {
 		nodes = append(nodes, node)
@@ -18,7 +20,7 @@ func (b bucketDriver) GetNodes() ([]string, error) {
 	return nodes, nil
 }
 
-func (b bucketDriver) AddNode(nodeID, bucketID string) error {
+func (b donutBucket) AddNode(nodeID, bucketID string) error {
 	tokens := strings.Split(bucketID, ":")
 	if len(tokens) != 3 {
 		return errors.New("Bucket ID malformed: " + bucketID)

pkg/storage/donut/donut.go

@@ -1,51 +1,181 @@
 package donut
 
 import (
+	"errors"
 	"io"
+	"sort"
+	"strconv"
+	"strings"
 )
 
-// INTERFACES
-
-// Donut interface
-type Donut interface {
-	CreateBucket(bucket string) error
-	GetObject(bucket, object string) (io.ReadCloser, error)
-	GetObjectMetadata(bucket, object string) (map[string]string, error)
-	GetObjectWriter(bucket, object string) (ObjectWriter, error)
-	ListBuckets() ([]string, error)
-	ListObjects(bucket string) ([]string, error)
+type donut struct {
+	buckets map[string]Bucket
+	nodes   map[string]Node
 }
 
-// Bucket interface
-type Bucket interface {
-	GetNodes() ([]string, error)
-	AddNode(nodeID, bucketID string) error
+// NewDonut - instantiate new donut driver
+func NewDonut(root string) (Donut, error) {
+	nodes := make(map[string]Node)
+	nodes["localhost"] = &localDirectoryNode{root: root}
+	driver := &donut{
+		buckets: make(map[string]Bucket),
+		nodes:   nodes,
+	}
+	for nodeID, node := range nodes {
+		bucketIDs, err := node.GetBuckets()
+		if err != nil {
+			return nil, err
+		}
+		for _, bucketID := range bucketIDs {
+			tokens := strings.Split(bucketID, ":")
+			if _, ok := driver.buckets[tokens[0]]; ok {
+				// found bucket, skip creating
+			} else {
+				bucket := donutBucket{
+					nodes: make([]string, 16),
+				}
+				// TODO catch errors
+				driver.buckets[tokens[0]] = bucket
+			}
+			if err = driver.buckets[tokens[0]].AddNode(nodeID, bucketID); err != nil {
+				return nil, err
+			}
+		}
+	}
+	return driver, nil
 }
 
-// Node interface
-type Node interface {
-	CreateBucket(bucket string) error
-	GetBuckets() ([]string, error)
-	GetDonutMetadata(bucket, object string) (map[string]string, error)
-	GetMetadata(bucket, object string) (map[string]string, error)
-	GetReader(bucket, object string) (io.ReadCloser, error)
-	GetWriter(bucket, object string) (Writer, error)
-	ListObjects(bucket string) ([]string, error)
+// CreateBucket - create a new bucket
+func (d donut) CreateBucket(bucketName string) error {
+	if _, ok := d.buckets[bucketName]; ok == false {
+		bucketName = strings.TrimSpace(bucketName)
+		if bucketName == "" {
+			return errors.New("Cannot create bucket with no name")
+		}
+		// assign nodes
+		// TODO assign other nodes
+		nodes := make([]string, 16)
+		for i := 0; i < 16; i++ {
+			nodes[i] = "localhost"
+			if node, ok := d.nodes["localhost"]; ok {
+				node.CreateBucket(bucketName + ":0:" + strconv.Itoa(i))
+			}
+		}
+		bucket := donutBucket{
+			nodes: nodes,
+		}
+		d.buckets[bucketName] = bucket
+		return nil
+	}
+	return errors.New("Bucket exists")
 }
 
-// ObjectWriter interface
-type ObjectWriter interface {
-	Close() error
-	CloseWithError(error) error
-	GetMetadata() (map[string]string, error)
-	SetMetadata(map[string]string) error
-	Write([]byte) (int, error)
+// ListBuckets - list all buckets
+func (d donut) ListBuckets() ([]string, error) {
+	var buckets []string
+	for bucket := range d.buckets {
+		buckets = append(buckets, bucket)
+	}
+	sort.Strings(buckets)
+	return buckets, nil
 }
 
-// Writer interface
-type Writer interface {
-	ObjectWriter
-
-	GetDonutMetadata() (map[string]string, error)
-	SetDonutMetadata(map[string]string) error
+// GetObjectWriter - get a new writer interface for a new object
+func (d donut) GetObjectWriter(bucketName, objectName string) (ObjectWriter, error) {
+	if bucket, ok := d.buckets[bucketName]; ok == true {
+		writers := make([]Writer, 16)
+		nodes, err := bucket.GetNodes()
+		if err != nil {
+			return nil, err
+		}
+		for i, nodeID := range nodes {
+			if node, ok := d.nodes[nodeID]; ok == true {
+				writer, err := node.GetWriter(bucketName+":0:"+strconv.Itoa(i), objectName)
+				if err != nil {
+					for _, writerToClose := range writers {
+						if writerToClose != nil {
+							writerToClose.CloseWithError(err)
+						}
+					}
+					return nil, err
+				}
+				writers[i] = writer
+			}
+		}
+		return newErasureWriter(writers), nil
+	}
+	return nil, errors.New("Bucket not found")
+}
+
+// GetObjectReader - get a new reader interface for a new object
+func (d donut) GetObjectReader(bucketName, objectName string) (io.ReadCloser, error) {
+	r, w := io.Pipe()
+	if bucket, ok := d.buckets[bucketName]; ok == true {
+		readers := make([]io.ReadCloser, 16)
+		nodes, err := bucket.GetNodes()
+		if err != nil {
+			return nil, err
+		}
+		var metadata map[string]string
+		for i, nodeID := range nodes {
+			if node, ok := d.nodes[nodeID]; ok == true {
+				bucketID := bucketName + ":0:" + strconv.Itoa(i)
+				reader, err := node.GetReader(bucketID, objectName)
+				if err != nil {
+					return nil, err
+				}
+				readers[i] = reader
+				if metadata == nil {
+					metadata, err = node.GetDonutMetadata(bucketID, objectName)
+					if err != nil {
+						return nil, err
+					}
+				}
+			}
+		}
+		go erasureReader(readers, metadata, w)
+		return r, nil
+	}
+	return nil, errors.New("Bucket not found")
+}
+
+// GetObjectMetadata returns metadata for a given object in a bucket
+func (d donut) GetObjectMetadata(bucketName, object string) (map[string]string, error) {
+	if bucket, ok := d.buckets[bucketName]; ok {
+		nodes, err := bucket.GetNodes()
+		if err != nil {
+			return nil, err
+		}
+		if node, ok := d.nodes[nodes[0]]; ok {
+			bucketID := bucketName + ":0:0"
+			metadata, err := node.GetMetadata(bucketID, object)
+			if err != nil {
+				return nil, err
+			}
+			donutMetadata, err := node.GetDonutMetadata(bucketID, object)
+			if err != nil {
+				return nil, err
+			}
+			metadata["sys.created"] = donutMetadata["created"]
+			metadata["sys.md5"] = donutMetadata["md5"]
+			metadata["sys.size"] = donutMetadata["size"]
+			return metadata, nil
+		}
+		return nil, errors.New("Cannot connect to node: " + nodes[0])
+	}
+	return nil, errors.New("Bucket not found")
+}
+
+// ListObjects - list all the available objects in a bucket
+func (d donut) ListObjects(bucketName string) ([]string, error) {
+	if bucket, ok := d.buckets[bucketName]; ok {
+		nodes, err := bucket.GetNodes()
+		if err != nil {
+			return nil, err
+		}
+		if node, ok := d.nodes[nodes[0]]; ok {
+			return node.ListObjects(bucketName + ":0:0")
+		}
+	}
+	return nil, errors.New("Bucket not found")
 }

pkg/storage/donut/donut_test.go

@@ -1,14 +1,14 @@
 package donut
 
 import (
-	"testing"
-
 	"bytes"
-	. "gopkg.in/check.v1"
 	"io"
 	"io/ioutil"
 	"os"
+	"testing"
 	"time"
+
+	. "gopkg.in/check.v1"
 )
 
 func Test(t *testing.T) { TestingT(t) }
@@ -21,7 +21,7 @@ func (s *MySuite) TestEmptyBucket(c *C) {
 	root, err := ioutil.TempDir(os.TempDir(), "donut-")
 	c.Assert(err, IsNil)
 	defer os.RemoveAll(root)
-	donut, err := NewDonutDriver(root)
+	donut, err := NewDonut(root)
 	c.Assert(err, IsNil)
 
 	// check buckets are empty
@@ -34,7 +34,7 @@ func (s *MySuite) TestBucketWithoutNameFails(c *C) {
 	root, err := ioutil.TempDir(os.TempDir(), "donut-")
 	c.Assert(err, IsNil)
 	defer os.RemoveAll(root)
-	donut, err := NewDonutDriver(root)
+	donut, err := NewDonut(root)
 	c.Assert(err, IsNil)
 	// fail to create new bucket without a name
 	err = donut.CreateBucket("")
@@ -48,7 +48,7 @@ func (s *MySuite) TestCreateBucketAndList(c *C) {
 	root, err := ioutil.TempDir(os.TempDir(), "donut-")
 	c.Assert(err, IsNil)
 	defer os.RemoveAll(root)
-	donut, err := NewDonutDriver(root)
+	donut, err := NewDonut(root)
 	c.Assert(err, IsNil)
 	// create bucket
 	err = donut.CreateBucket("foo")
@@ -64,7 +64,7 @@ func (s *MySuite) TestCreateBucketWithSameNameFails(c *C) {
 	root, err := ioutil.TempDir(os.TempDir(), "donut-")
 	c.Assert(err, IsNil)
 	defer os.RemoveAll(root)
-	donut, err := NewDonutDriver(root)
+	donut, err := NewDonut(root)
 	c.Assert(err, IsNil)
 	err = donut.CreateBucket("foo")
 	c.Assert(err, IsNil)
@@ -77,7 +77,7 @@ func (s *MySuite) TestCreateMultipleBucketsAndList(c *C) {
 	root, err := ioutil.TempDir(os.TempDir(), "donut-")
 	c.Assert(err, IsNil)
 	defer os.RemoveAll(root)
-	donut, err := NewDonutDriver(root)
+	donut, err := NewDonut(root)
 	c.Assert(err, IsNil)
 	// add a second bucket
 	err = donut.CreateBucket("foo")
@@ -102,7 +102,7 @@ func (s *MySuite) TestNewObjectFailsWithoutBucket(c *C) {
 	root, err := ioutil.TempDir(os.TempDir(), "donut-")
 	c.Assert(err, IsNil)
 	defer os.RemoveAll(root)
-	donut, err := NewDonutDriver(root)
+	donut, err := NewDonut(root)
 	c.Assert(err, IsNil)
 
 	writer, err := donut.GetObjectWriter("foo", "obj")
@@ -114,7 +114,7 @@ func (s *MySuite) TestNewObjectFailsWithEmptyName(c *C) {
 	root, err := ioutil.TempDir(os.TempDir(), "donut-")
 	c.Assert(err, IsNil)
 	defer os.RemoveAll(root)
-	donut, err := NewDonutDriver(root)
+	donut, err := NewDonut(root)
 	c.Assert(err, IsNil)
 
 	writer, err := donut.GetObjectWriter("foo", "")
@@ -130,7 +130,7 @@ func (s *MySuite) TestNewObjectCanBeWritten(c *C) {
 	root, err := ioutil.TempDir(os.TempDir(), "donut-")
 	c.Assert(err, IsNil)
 	defer os.RemoveAll(root)
-	donut, err := NewDonutDriver(root)
+	donut, err := NewDonut(root)
 	c.Assert(err, IsNil)
 
 	err = donut.CreateBucket("foo")
@@ -161,7 +161,7 @@ func (s *MySuite) TestNewObjectCanBeWritten(c *C) {
 
 	c.Assert(err, IsNil)
 
-	reader, err := donut.GetObject("foo", "obj")
+	reader, err := donut.GetObjectReader("foo", "obj")
 	c.Assert(err, IsNil)
 
 	var actualData bytes.Buffer
@@ -183,7 +183,7 @@ func (s *MySuite) TestMultipleNewObjects(c *C) {
 	root, err := ioutil.TempDir(os.TempDir(), "donut-")
 	c.Assert(err, IsNil)
 	defer os.RemoveAll(root)
-	donut, err := NewDonutDriver(root)
+	donut, err := NewDonut(root)
 	c.Assert(err, IsNil)
 
 	c.Assert(donut.CreateBucket("foo"), IsNil)
@@ -199,7 +199,7 @@ func (s *MySuite) TestMultipleNewObjects(c *C) {
 
 	//	c.Skip("not complete")
 
-	reader, err := donut.GetObject("foo", "obj1")
+	reader, err := donut.GetObjectReader("foo", "obj1")
 	c.Assert(err, IsNil)
 	var readerBuffer1 bytes.Buffer
 	_, err = io.Copy(&readerBuffer1, reader)
@@ -207,7 +207,7 @@ func (s *MySuite) TestMultipleNewObjects(c *C) {
 	//	c.Skip("Not Implemented")
 	c.Assert(readerBuffer1.Bytes(), DeepEquals, []byte("one"))
 
-	reader, err = donut.GetObject("foo", "obj2")
+	reader, err = donut.GetObjectReader("foo", "obj2")
 	c.Assert(err, IsNil)
 	var readerBuffer2 bytes.Buffer
 	_, err = io.Copy(&readerBuffer2, reader)
@@ -224,7 +224,7 @@ func (s *MySuite) TestSysPrefixShouldFail(c *C) {
 	root, err := ioutil.TempDir(os.TempDir(), "donut-")
 	c.Assert(err, IsNil)
 	defer os.RemoveAll(root)
-	donut, err := NewDonutDriver(root)
+	donut, err := NewDonut(root)
 	c.Assert(err, IsNil)
 
 	c.Assert(donut.CreateBucket("foo"), IsNil)

pkg/storage/donut/donutdriver.go

@@ -1,176 +0,0 @@
-package donut
-
-import (
-	"errors"
-	"io"
-	"sort"
-	"strconv"
-	"strings"
-)
-
-type donutDriver struct {
-	buckets map[string]Bucket
-	nodes   map[string]Node
-}
-
-// NewDonutDriver - instantiate new donut driver
-func NewDonutDriver(root string) (Donut, error) {
-	nodes := make(map[string]Node)
-	nodes["localhost"] = &localDirectoryNode{root: root}
-	driver := &donutDriver{
-		buckets: make(map[string]Bucket),
-		nodes:   nodes,
-	}
-	for nodeID, node := range nodes {
-		bucketIDs, err := node.GetBuckets()
-		if err != nil {
-			return nil, err
-		}
-		for _, bucketID := range bucketIDs {
-			tokens := strings.Split(bucketID, ":")
-			if _, ok := driver.buckets[tokens[0]]; ok {
-				// found bucket, skip creating
-			} else {
-				bucket := bucketDriver{
-					nodes: make([]string, 16),
-				}
-				// TODO catch errors
-				driver.buckets[tokens[0]] = bucket
-			}
-			if err = driver.buckets[tokens[0]].AddNode(nodeID, bucketID); err != nil {
-				return nil, err
-			}
-		}
-	}
-	return driver, nil
-}
-
-func (driver donutDriver) CreateBucket(bucketName string) error {
-	if _, ok := driver.buckets[bucketName]; ok == false {
-		bucketName = strings.TrimSpace(bucketName)
-		if bucketName == "" {
-			return errors.New("Cannot create bucket with no name")
-		}
-		// assign nodes
-		// TODO assign other nodes
-		nodes := make([]string, 16)
-		for i := 0; i < 16; i++ {
-			nodes[i] = "localhost"
-			if node, ok := driver.nodes["localhost"]; ok {
-				node.CreateBucket(bucketName + ":0:" + strconv.Itoa(i))
-			}
-		}
-		bucket := bucketDriver{
-			nodes: nodes,
-		}
-		driver.buckets[bucketName] = bucket
-		return nil
-	}
-	return errors.New("Bucket exists")
-}
-
-func (driver donutDriver) ListBuckets() ([]string, error) {
-	var buckets []string
-	for bucket := range driver.buckets {
-		buckets = append(buckets, bucket)
-	}
-	sort.Strings(buckets)
-	return buckets, nil
-}
-
-func (driver donutDriver) GetObjectWriter(bucketName, objectName string) (ObjectWriter, error) {
-	if bucket, ok := driver.buckets[bucketName]; ok == true {
-		writers := make([]Writer, 16)
-		nodes, err := bucket.GetNodes()
-		if err != nil {
-			return nil, err
-		}
-		for i, nodeID := range nodes {
-			if node, ok := driver.nodes[nodeID]; ok == true {
-				writer, err := node.GetWriter(bucketName+":0:"+strconv.Itoa(i), objectName)
-				if err != nil {
-					for _, writerToClose := range writers {
-						if writerToClose != nil {
-							writerToClose.CloseWithError(err)
-						}
-					}
-					return nil, err
-				}
-				writers[i] = writer
-			}
-		}
-		return newErasureWriter(writers), nil
-	}
-	return nil, errors.New("Bucket not found")
-}
-
-func (driver donutDriver) GetObject(bucketName, objectName string) (io.ReadCloser, error) {
-	r, w := io.Pipe()
-	if bucket, ok := driver.buckets[bucketName]; ok == true {
-		readers := make([]io.ReadCloser, 16)
-		nodes, err := bucket.GetNodes()
-		if err != nil {
-			return nil, err
-		}
-		var metadata map[string]string
-		for i, nodeID := range nodes {
-			if node, ok := driver.nodes[nodeID]; ok == true {
-				bucketID := bucketName + ":0:" + strconv.Itoa(i)
-				reader, err := node.GetReader(bucketID, objectName)
-				if err != nil {
-					return nil, err
-				}
-				readers[i] = reader
-				if metadata == nil {
-					metadata, err = node.GetDonutMetadata(bucketID, objectName)
-					if err != nil {
-						return nil, err
-					}
-				}
-			}
-		}
-		go erasureReader(readers, metadata, w)
-		return r, nil
-	}
-	return nil, errors.New("Bucket not found")
-}
-
-// GetObjectMetadata returns metadata for a given object in a bucket
-func (driver donutDriver) GetObjectMetadata(bucketName, object string) (map[string]string, error) {
-	if bucket, ok := driver.buckets[bucketName]; ok {
-		nodes, err := bucket.GetNodes()
-		if err != nil {
-			return nil, err
-		}
-		if node, ok := driver.nodes[nodes[0]]; ok {
-			bucketID := bucketName + ":0:0"
-			metadata, err := node.GetMetadata(bucketID, object)
-			if err != nil {
-				return nil, err
-			}
-			donutMetadata, err := node.GetDonutMetadata(bucketID, object)
-			if err != nil {
-				return nil, err
-			}
-			metadata["sys.created"] = donutMetadata["created"]
-			metadata["sys.md5"] = donutMetadata["md5"]
-			metadata["sys.size"] = donutMetadata["size"]
-			return metadata, nil
-		}
-		return nil, errors.New("Cannot connect to node: " + nodes[0])
-	}
-	return nil, errors.New("Bucket not found")
-}
-
-func (driver donutDriver) ListObjects(bucketName string) ([]string, error) {
-	if bucket, ok := driver.buckets[bucketName]; ok {
-		nodes, err := bucket.GetNodes()
-		if err != nil {
-			return nil, err
-		}
-		if node, ok := driver.nodes[nodes[0]]; ok {
-			return node.ListObjects(bucketName + ":0:0")
-		}
-	}
-	return nil, errors.New("Bucket not found")
-}

pkg/storage/donut/erasure.go

@@ -2,29 +2,70 @@ package donut
 
 import (
 	"bytes"
+	"errors"
 	"io"
 	"strconv"
+	"strings"
 	"time"
 
 	"crypto/md5"
 	"encoding/hex"
-	"errors"
+
 	"github.com/minio-io/minio/pkg/encoding/erasure"
 	"github.com/minio-io/minio/pkg/utils/split"
-	"strings"
 )
 
+// getErasureTechnique - convert technique string into Technique type
+func getErasureTechnique(technique string) (erasure.Technique, error) {
+	switch true {
+	case technique == "Cauchy":
+		return erasure.Cauchy, nil
+	case technique == "Vandermonde":
+		return erasure.Cauchy, nil
+	default:
+		return erasure.None, errors.New("Invalid erasure technique")
+	}
+}
+
+// erasureReader - returns aligned streaming reads over a PipeWriter
 func erasureReader(readers []io.ReadCloser, donutMetadata map[string]string, writer *io.PipeWriter) {
-	// TODO handle errors
-	totalChunks, _ := strconv.Atoi(donutMetadata["chunkCount"])
-	totalLeft, _ := strconv.Atoi(donutMetadata["size"])
-	blockSize, _ := strconv.Atoi(donutMetadata["blockSize"])
-	k, _ := strconv.Atoi(donutMetadata["erasureK"])
-	m, _ := strconv.Atoi(donutMetadata["erasureM"])
-	expectedMd5sum, _ := hex.DecodeString(donutMetadata["md5"])
+	totalChunks, err := strconv.Atoi(donutMetadata["chunkCount"])
+	if err != nil {
+		writer.CloseWithError(err)
+		return
+	}
+	totalLeft, err := strconv.Atoi(donutMetadata["size"])
+	if err != nil {
+		writer.CloseWithError(err)
+		return
+	}
+	blockSize, err := strconv.Atoi(donutMetadata["blockSize"])
+	if err != nil {
+		writer.CloseWithError(err)
+		return
+	}
+	k, err := strconv.Atoi(donutMetadata["erasureK"])
+	if err != nil {
+		writer.CloseWithError(err)
+		return
+	}
+	m, err := strconv.Atoi(donutMetadata["erasureM"])
+	if err != nil {
+		writer.CloseWithError(err)
+		return
+	}
+	expectedMd5sum, err := hex.DecodeString(donutMetadata["md5"])
+	if err != nil {
+		writer.CloseWithError(err)
+		return
+	}
+	technique, err := getErasureTechnique(donutMetadata["erasureTechnique"])
+	if err != nil {
+		writer.CloseWithError(err)
+		return
+	}
 	summer := md5.New()
-	// TODO select technique properly
-	params, _ := erasure.ParseEncoderParams(uint8(k), uint8(m), erasure.Cauchy)
+	params, _ := erasure.ParseEncoderParams(uint8(k), uint8(m), technique)
 	encoder := erasure.NewEncoder(params)
 	for _, reader := range readers {
 		defer reader.Close()
@@ -34,13 +75,17 @@ func erasureReader(readers []io.ReadCloser, donutMetadata map[string]string, wri
 		if blockSize < totalLeft {
 			curBlockSize = blockSize
 		}
-		curChunkSize := erasure.GetEncodedChunkLen(curBlockSize, uint8(k))
+
+		curChunkSize := erasure.GetEncodedBlockLen(curBlockSize, uint8(k))
 
 		encodedBytes := make([][]byte, 16)
 		for i, reader := range readers {
 			var bytesBuffer bytes.Buffer
-			// TODO watch for errors
-			io.CopyN(&bytesBuffer, reader, int64(curChunkSize))
+			_, err := io.CopyN(&bytesBuffer, reader, int64(curChunkSize))
+			if err != nil {
+				writer.CloseWithError(err)
+				return
+			}
 			encodedBytes[i] = bytesBuffer.Bytes()
 		}
 		decodedData, err := encoder.Decode(encodedBytes, curBlockSize)
@@ -49,7 +94,11 @@ func erasureReader(readers []io.ReadCloser, donutMetadata map[string]string, wri
 			return
 		}
 		summer.Write(decodedData)
-		io.Copy(writer, bytes.NewBuffer(decodedData))
+		_, err = io.Copy(writer, bytes.NewBuffer(decodedData))
+		if err != nil {
+			writer.CloseWithError(err)
+			return
+		}
 		totalLeft = totalLeft - blockSize
 	}
 	actualMd5sum := summer.Sum(nil)
@@ -58,6 +107,7 @@ func erasureReader(readers []io.ReadCloser, donutMetadata map[string]string, wri
 		return
 	}
 	writer.Close()
+	return
 }
 
 // erasure writer
@@ -70,6 +120,7 @@ type erasureWriter struct {
 	isClosed      <-chan bool
 }
 
+// newErasureWriter - get a new writer
 func newErasureWriter(writers []Writer) ObjectWriter {
 	r, w := io.Pipe()
 	isClosed := make(chan bool)

pkg/storage/donut/interfaces.go

@@ -0,0 +1,51 @@
+package donut
+
+import (
+	"io"
+)
+
+// Collection of Donut specification interfaces
+
+// Donut interface
+type Donut interface {
+	CreateBucket(bucket string) error
+	GetObjectReader(bucket, object string) (io.ReadCloser, error)
+	GetObjectWriter(bucket, object string) (ObjectWriter, error)
+	GetObjectMetadata(bucket, object string) (map[string]string, error)
+	ListBuckets() ([]string, error)
+	ListObjects(bucket string) ([]string, error)
+}
+
+// Bucket interface
+type Bucket interface {
+	GetNodes() ([]string, error)
+	AddNode(nodeID, bucketID string) error
+}
+
+// Node interface
+type Node interface {
+	CreateBucket(bucket string) error
+	GetBuckets() ([]string, error)
+	GetDonutMetadata(bucket, object string) (map[string]string, error)
+	GetMetadata(bucket, object string) (map[string]string, error)
+	GetReader(bucket, object string) (io.ReadCloser, error)
+	GetWriter(bucket, object string) (Writer, error)
+	ListObjects(bucket string) ([]string, error)
+}
+
+// ObjectWriter interface
+type ObjectWriter interface {
+	Close() error
+	CloseWithError(error) error
+	GetMetadata() (map[string]string, error)
+	SetMetadata(map[string]string) error
+	Write([]byte) (int, error)
+}
+
+// Writer interface
+type Writer interface {
+	ObjectWriter
+
+	GetDonutMetadata() (map[string]string, error)
+	SetDonutMetadata(map[string]string) error
+}

pkg/storage/donut/node_local.go

@@ -41,7 +41,7 @@ func (d localDirectoryNode) GetWriter(bucket, object string) (Writer, error) {
 	if err != nil {
 		return nil, err
 	}
-	return newDonutFileWriter(objectPath)
+	return newDonutObjectWriter(objectPath)
 }
 
 func (d localDirectoryNode) GetReader(bucket, object string) (io.ReadCloser, error) {

pkg/storage/donut/object_writer.go

@@ -7,12 +7,12 @@ import (
 	"path"
 )
 
-func newDonutFileWriter(objectDir string) (Writer, error) {
+func newDonutObjectWriter(objectDir string) (Writer, error) {
 	dataFile, err := os.OpenFile(path.Join(objectDir, "data"), os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0600)
 	if err != nil {
 		return nil, err
 	}
-	return donutFileWriter{
+	return donutObjectWriter{
 		root:          objectDir,
 		file:          dataFile,
 		metadata:      make(map[string]string),
@@ -20,7 +20,7 @@ func newDonutFileWriter(objectDir string) (Writer, error) {
 	}, nil
 }
 
-type donutFileWriter struct {
+type donutObjectWriter struct {
 	root          string
 	file          *os.File
 	metadata      map[string]string
@@ -28,11 +28,11 @@ type donutFileWriter struct {
 	err           error
 }
 
-func (d donutFileWriter) Write(data []byte) (int, error) {
+func (d donutObjectWriter) Write(data []byte) (int, error) {
 	return d.file.Write(data)
 }
 
-func (d donutFileWriter) Close() error {
+func (d donutObjectWriter) Close() error {
 	if d.err != nil {
 		return d.err
 	}
@@ -44,14 +44,14 @@ func (d donutFileWriter) Close() error {
 	return d.file.Close()
 }
 
-func (d donutFileWriter) CloseWithError(err error) error {
+func (d donutObjectWriter) CloseWithError(err error) error {
 	if d.err != nil {
 		d.err = err
 	}
 	return d.Close()
 }
 
-func (d donutFileWriter) SetMetadata(metadata map[string]string) error {
+func (d donutObjectWriter) SetMetadata(metadata map[string]string) error {
 	for k := range d.metadata {
 		delete(d.metadata, k)
 	}
@@ -61,7 +61,7 @@ func (d donutFileWriter) SetMetadata(metadata map[string]string) error {
 	return nil
 }
 
-func (d donutFileWriter) GetMetadata() (map[string]string, error) {
+func (d donutObjectWriter) GetMetadata() (map[string]string, error) {
 	metadata := make(map[string]string)
 	for k, v := range d.metadata {
 		metadata[k] = v
@@ -69,7 +69,7 @@ func (d donutFileWriter) GetMetadata() (map[string]string, error) {
 	return metadata, nil
 }
 
-func (d donutFileWriter) SetDonutMetadata(metadata map[string]string) error {
+func (d donutObjectWriter) SetDonutMetadata(metadata map[string]string) error {
 	for k := range d.donutMetadata {
 		delete(d.donutMetadata, k)
 	}
@@ -79,7 +79,7 @@ func (d donutFileWriter) SetDonutMetadata(metadata map[string]string) error {
 	return nil
 }
 
-func (d donutFileWriter) GetDonutMetadata() (map[string]string, error) {
+func (d donutObjectWriter) GetDonutMetadata() (map[string]string, error) {
 	donutMetadata := make(map[string]string)
 	for k, v := range d.donutMetadata {
 		donutMetadata[k] = v

pkg/storage/donut/objectwriter.go

@@ -1,39 +0,0 @@
-package donut
-
-import (
-	"errors"
-)
-
-type objectWriter struct {
-	metadata map[string]string
-}
-
-func (obj objectWriter) Write(data []byte) (length int, err error) {
-	return 11, nil
-}
-
-func (obj objectWriter) Close() error {
-	return nil
-}
-
-func (obj objectWriter) CloseWithError(err error) error {
-	return errors.New("Not Implemented")
-}
-
-func (obj objectWriter) SetMetadata(metadata map[string]string) error {
-	for k := range obj.metadata {
-		delete(obj.metadata, k)
-	}
-	for k, v := range metadata {
-		obj.metadata[k] = v
-	}
-	return nil
-}
-
-func (obj objectWriter) GetMetadata() (map[string]string, error) {
-	ret := make(map[string]string)
-	for k, v := range obj.metadata {
-		ret[k] = v
-	}
-	return ret, nil
-}

pkg/storage/file/file_bucket.go

@@ -1,133 +0,0 @@
-/*
- * Minimalist Object Storage, (C) 2015 Minio, 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,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package file
-
-import (
-	"os"
-	"path"
-	"sort"
-	"strings"
-
-	"io/ioutil"
-	"path/filepath"
-
-	mstorage "github.com/minio-io/minio/pkg/storage"
-)
-
-/// Bucket Operations
-
-// ListBuckets - Get service
-func (storage *Storage) ListBuckets() ([]mstorage.BucketMetadata, error) {
-	files, err := ioutil.ReadDir(storage.root)
-	if err != nil {
-		return []mstorage.BucketMetadata{}, mstorage.EmbedError("bucket", "", err)
-	}
-
-	var metadataList []mstorage.BucketMetadata
-	for _, file := range files {
-		// Skip policy files
-		if strings.HasSuffix(file.Name(), "_policy.json") {
-			continue
-		}
-		if !file.IsDir() {
-			return []mstorage.BucketMetadata{}, mstorage.BackendCorrupted{Path: storage.root}
-		}
-		metadata := mstorage.BucketMetadata{
-			Name:    file.Name(),
-			Created: file.ModTime(), // TODO - provide real created time
-		}
-		metadataList = append(metadataList, metadata)
-	}
-	return metadataList, nil
-}
-
-// CreateBucket - PUT Bucket
-func (storage *Storage) CreateBucket(bucket string) error {
-	storage.lock.Lock()
-	defer storage.lock.Unlock()
-
-	// verify bucket path legal
-	if mstorage.IsValidBucket(bucket) == false {
-		return mstorage.BucketNameInvalid{Bucket: bucket}
-	}
-
-	// get bucket path
-	bucketDir := path.Join(storage.root, bucket)
-
-	// check if bucket exists
-	if _, err := os.Stat(bucketDir); err == nil {
-		return mstorage.BucketExists{
-			Bucket: bucket,
-		}
-	}
-
-	// make bucket
-	err := os.Mkdir(bucketDir, 0700)
-	if err != nil {
-		return mstorage.EmbedError(bucket, "", err)
-	}
-	return nil
-}
-
-// ListObjects - GET bucket (list objects)
-func (storage *Storage) ListObjects(bucket string, resources mstorage.BucketResourcesMetadata) ([]mstorage.ObjectMetadata, mstorage.BucketResourcesMetadata, error) {
-	p := bucketDir{}
-	p.files = make(map[string]os.FileInfo)
-
-	if mstorage.IsValidBucket(bucket) == false {
-		return []mstorage.ObjectMetadata{}, resources, mstorage.BucketNameInvalid{Bucket: bucket}
-	}
-	if resources.Prefix != "" && mstorage.IsValidObject(resources.Prefix) == false {
-		return []mstorage.ObjectMetadata{}, resources, mstorage.ObjectNameInvalid{Bucket: bucket, Object: resources.Prefix}
-	}
-
-	rootPrefix := path.Join(storage.root, bucket)
-	// check bucket exists
-	if _, err := os.Stat(rootPrefix); os.IsNotExist(err) {
-		return []mstorage.ObjectMetadata{}, resources, mstorage.BucketNotFound{Bucket: bucket}
-	}
-
-	p.root = rootPrefix
-	err := filepath.Walk(rootPrefix, p.getAllFiles)
-	if err != nil {
-		return []mstorage.ObjectMetadata{}, resources, mstorage.EmbedError(bucket, "", err)
-	}
-
-	var metadataList []mstorage.ObjectMetadata
-	var metadata mstorage.ObjectMetadata
-
-	// Populate filtering mode
-	resources.Mode = mstorage.GetMode(resources)
-
-	for name, file := range p.files {
-		if len(metadataList) >= resources.Maxkeys {
-			resources.IsTruncated = true
-			goto ret
-		}
-		metadata, resources, err = storage.filter(bucket, name, file, resources)
-		if err != nil {
-			return []mstorage.ObjectMetadata{}, resources, mstorage.EmbedError(bucket, "", err)
-		}
-		if metadata.Bucket != "" {
-			metadataList = append(metadataList, metadata)
-		}
-	}
-
-ret:
-	sort.Sort(byObjectKey(metadataList))
-	return metadataList, resources, nil
-}

pkg/storage/file/file_policy.go

@@ -1,111 +0,0 @@
-/*
- * Minimalist Object Storage, (C) 2015 Minio, 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,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package file
-
-import (
-	"os"
-	"path"
-
-	"encoding/json"
-	mstorage "github.com/minio-io/minio/pkg/storage"
-)
-
-// GetBucketPolicy - GET bucket policy
-func (storage *Storage) GetBucketPolicy(bucket string) (mstorage.BucketPolicy, error) {
-	storage.lock.Lock()
-	defer storage.lock.Unlock()
-
-	var p mstorage.BucketPolicy
-	// verify bucket path legal
-	if mstorage.IsValidBucket(bucket) == false {
-		return mstorage.BucketPolicy{}, mstorage.BucketNameInvalid{Bucket: bucket}
-	}
-
-	// get bucket path
-	bucketDir := path.Join(storage.root, bucket)
-	// check if bucket exists
-	if _, err := os.Stat(bucketDir); err != nil {
-		return mstorage.BucketPolicy{}, mstorage.BucketNotFound{Bucket: bucket}
-	}
-
-	// get policy path
-	bucketPolicy := path.Join(storage.root, bucket+"_policy.json")
-	filestat, err := os.Stat(bucketPolicy)
-
-	if os.IsNotExist(err) {
-		return mstorage.BucketPolicy{}, mstorage.BucketPolicyNotFound{Bucket: bucket}
-	}
-
-	if filestat.IsDir() {
-		return mstorage.BucketPolicy{}, mstorage.BackendCorrupted{Path: bucketPolicy}
-	}
-
-	file, err := os.OpenFile(bucketPolicy, os.O_RDONLY, 0666)
-	defer file.Close()
-	if err != nil {
-		return mstorage.BucketPolicy{}, mstorage.EmbedError(bucket, "", err)
-	}
-	encoder := json.NewDecoder(file)
-	err = encoder.Decode(&p)
-	if err != nil {
-		return mstorage.BucketPolicy{}, mstorage.EmbedError(bucket, "", err)
-	}
-
-	return p, nil
-
-}
-
-// CreateBucketPolicy - PUT bucket policy
-func (storage *Storage) CreateBucketPolicy(bucket string, p mstorage.BucketPolicy) error {
-	storage.lock.Lock()
-	defer storage.lock.Unlock()
-
-	// verify bucket path legal
-	if mstorage.IsValidBucket(bucket) == false {
-		return mstorage.BucketNameInvalid{Bucket: bucket}
-	}
-
-	// get bucket path
-	bucketDir := path.Join(storage.root, bucket)
-	// check if bucket exists
-	if _, err := os.Stat(bucketDir); err != nil {
-		return mstorage.BucketNotFound{
-			Bucket: bucket,
-		}
-	}
-
-	// get policy path
-	bucketPolicy := path.Join(storage.root, bucket+"_policy.json")
-	filestat, ret := os.Stat(bucketPolicy)
-	if !os.IsNotExist(ret) {
-		if filestat.IsDir() {
-			return mstorage.BackendCorrupted{Path: bucketPolicy}
-		}
-	}
-
-	file, err := os.OpenFile(bucketPolicy, os.O_WRONLY|os.O_CREATE, 0600)
-	defer file.Close()
-	if err != nil {
-		return mstorage.EmbedError(bucket, "", err)
-	}
-	encoder := json.NewEncoder(file)
-	err = encoder.Encode(p)
-	if err != nil {
-		return mstorage.EmbedError(bucket, "", err)
-	}
-	return nil
-}