command buckets converted to the cobra style

cmd/bbolt/command_buckets.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+	bolt "go.etcd.io/bbolt"
+)
+
+// newBucketsCommand creates a new command that prints a list of buckets in the given Bolt database.
+//
+// The path to a Bolt database must be specified as an argument.
+func newBucketsCommand() *cobra.Command {
+	var bucketsCmd = &cobra.Command{
+		Use:   "buckets <path>",
+		Short: "Print a list of buckets",
+		Long:  "Print a list of buckets in the given Bolt database\nThe path to a Bolt database must be specified as an argument",
+		Args:  cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return printBucketsList(cmd, args[0])
+		},
+	}
+	return bucketsCmd
+}
+
+// printBucketsList prints a list of buckets in the given Bolt database.
+func printBucketsList(cmd *cobra.Command, path string) error {
+	// Required database path.
+	if path == "" {
+		return ErrPathRequired
+		// Verify if the specified database file exists.
+	} else if _, err := os.Stat(path); os.IsNotExist(err) {
+		return ErrFileNotFound
+	}
+
+	// Open database.
+	db, err := bolt.Open(path, 0600, &bolt.Options{ReadOnly: true})
+	if err != nil {
+		return err
+	}
+	defer db.Close()
+
+	// Print the list of buckets in the database.
+	return db.View(func(tx *bolt.Tx) error {
+		return tx.ForEach(func(name []byte, _ *bolt.Bucket) error {
+			fmt.Fprintln(cmd.OutOrStdout(), string(name))
+			return nil
+		})
+	})
+}

cmd/bbolt/command_buckets_test.go

@@ -0,0 +1,53 @@
+package main_test
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/spf13/cobra"
+	"github.com/stretchr/testify/require"
+
+	bolt "go.etcd.io/bbolt"
+	main "go.etcd.io/bbolt/cmd/bbolt"
+	"go.etcd.io/bbolt/internal/btesting"
+)
+
+// Ensure the "buckets" command can print a list of buckets.
+func TestBuckets(t *testing.T) {
+	// Create a test database and populate it with sample buckets.
+	t.Log("Creating sample DB")
+	db := btesting.MustCreateDB(t)
+	t.Log("Creating sample Buckets")
+	if err := db.Update(func(tx *bolt.Tx) error {
+		for _, name := range []string{"foo", "bar", "baz"} {
+			_, err := tx.CreateBucket([]byte(name))
+			if err != nil {
+				return err
+			}
+		}
+		return nil
+	}); err != nil {
+		t.Fatal(err)
+	}
+	db.Close()
+	defer requireDBNoChange(t, dbData(t, db.Path()), db.Path())
+
+	// setup the bucketscommand.
+	t.Log("Running buckets command")
+	rootCmd := main.NewRootCommand()
+	_, actualOutput, err := executeCommand(rootCmd, "buckets", db.Path()) //rootCmd, "buckets", db.Path())
+	require.NoError(t, err)
+	t.Log("Verify result")
+	expected := "bar\nbaz\nfoo\n"
+	require.EqualValues(t, expected, actualOutput)
+}
+
+// executeCommand runs the given command and returns the output and error.
+func executeCommand(rootCmd *cobra.Command, args ...string) (*cobra.Command, string, error) {
+	outputBuf := bytes.NewBufferString("")
+	rootCmd.SetOut(outputBuf)
+	rootCmd.SetErr(outputBuf)
+	rootCmd.SetArgs(args)
+	c, err := rootCmd.ExecuteC()
+	return c, outputBuf.String(), err
+}

cmd/bbolt/command_root.go

@@ -21,6 +21,7 @@ func NewRootCommand() *cobra.Command {
 		newSurgeryCommand(),
 		newInspectCommand(),
 		newCheckCommand(),
+		newBucketsCommand(),
 	)
 
 	return rootCmd

cmd/bbolt/main.go

@@ -122,8 +122,6 @@ func (m *Main) Run(args ...string) error {
 		return ErrUsage
 	case "bench":
 		return newBenchCommand(m).Run(args[1:]...)
-	case "buckets":
-		return newBucketsCommand(m).Run(args[1:]...)
 	case "compact":
 		return newCompactCommand(m).Run(args[1:]...)
 	case "dump":
@@ -763,63 +761,6 @@ experience corruption, please submit a ticket to the etcd-io/bbolt project page:
 `, "\n")
 }
 
-// bucketsCommand represents the "buckets" command execution.
-type bucketsCommand struct {
-	baseCommand
-}
-
-// newBucketsCommand returns a bucketsCommand.
-func newBucketsCommand(m *Main) *bucketsCommand {
-	c := &bucketsCommand{}
-	c.baseCommand = m.baseCommand
-	return c
-}
-
-// Run executes the command.
-func (cmd *bucketsCommand) Run(args ...string) error {
-	// Parse flags.
-	fs := flag.NewFlagSet("", flag.ContinueOnError)
-	help := fs.Bool("h", false, "")
-	if err := fs.Parse(args); err != nil {
-		return err
-	} else if *help {
-		fmt.Fprintln(cmd.Stderr, cmd.Usage())
-		return ErrUsage
-	}
-
-	// Require database path.
-	path := fs.Arg(0)
-	if path == "" {
-		return ErrPathRequired
-	} else if _, err := os.Stat(path); os.IsNotExist(err) {
-		return ErrFileNotFound
-	}
-
-	// Open database.
-	db, err := bolt.Open(path, 0600, &bolt.Options{ReadOnly: true})
-	if err != nil {
-		return err
-	}
-	defer db.Close()
-
-	// Print buckets.
-	return db.View(func(tx *bolt.Tx) error {
-		return tx.ForEach(func(name []byte, _ *bolt.Bucket) error {
-			fmt.Fprintln(cmd.Stdout, string(name))
-			return nil
-		})
-	})
-}
-
-// Usage returns the help message.
-func (cmd *bucketsCommand) Usage() string {
-	return strings.TrimLeft(`
-usage: bolt buckets PATH
-
-Print a list of buckets.
-`, "\n")
-}
-
 // keysCommand represents the "keys" command execution.
 type keysCommand struct {
 	baseCommand

cmd/bbolt/main_test.go

@@ -274,36 +274,6 @@ func TestStatsCommand_Run(t *testing.T) {
 	}
 }
 
-// Ensure the "buckets" command can print a list of buckets.
-func TestBucketsCommand_Run(t *testing.T) {
-	db := btesting.MustCreateDB(t)
-
-	if err := db.Update(func(tx *bolt.Tx) error {
-		for _, name := range []string{"foo", "bar", "baz"} {
-			_, err := tx.CreateBucket([]byte(name))
-			if err != nil {
-				return err
-			}
-		}
-		return nil
-	}); err != nil {
-		t.Fatal(err)
-	}
-	db.Close()
-
-	defer requireDBNoChange(t, dbData(t, db.Path()), db.Path())
-
-	expected := "bar\nbaz\nfoo\n"
-
-	// Run the command.
-	m := NewMain()
-	if err := m.Run("buckets", db.Path()); err != nil {
-		t.Fatal(err)
-	} else if actual := m.Stdout.String(); actual != expected {
-		t.Fatalf("unexpected stdout:\n\n%s", actual)
-	}
-}
-
 // Ensure the "keys" command can print a list of keys for a bucket.
 func TestKeysCommand_Run(t *testing.T) {
 	testCases := []struct {