Added logic for working with Tarantool schema via Box

- Implemented the `box.Schema()` method that returns a `Schema` object for schema-related operations

CHANGELOG.md

@@ -10,6 +10,8 @@ Versioning](http://semver.org/spec/v2.0.0.html) except to the first release.
 
 ### Added
 
+- Implemented box.schema.user operations requests and sugar interface.
+
 ### Changed
 
 ### Fixed

box/box_test.go

@@ -10,7 +10,6 @@ import (
 func TestNew(t *testing.T) {
 	// Create a box instance with a nil connection. This should lead to a panic later.
 	b := box.New(nil)
-
 	// Ensure the box instance is not nil (which it shouldn't be), but this is not meaningful
 	// since we will panic when we call the Info method with the nil connection.
 	require.NotNil(t, b)

box/schema.go

@@ -0,0 +1,17 @@
+package box
+
+import "github.com/tarantool/go-tarantool/v2"
+
+// Schema represents the schema-related operations in Tarantool.
+// It holds a connection to interact with the Tarantool instance.
+type Schema struct {
+	conn tarantool.Doer // Connection interface for interacting with Tarantool.
+}
+
+// Schema returns a new Schema instance, providing access to schema-related operations.
+// It uses the connection from the Box instance to communicate with Tarantool.
+func (b *Box) Schema() *Schema {
+	return &Schema{
+		conn: b.conn, // Pass the Box connection to the Schema.
+	}
+}

box/schema_user.go

@@ -0,0 +1,155 @@
+package box
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/tarantool/go-tarantool/v2"
+	"github.com/vmihailenco/msgpack/v5"
+)
+
+// SchemaUser provides methods to interact with schema-related user operations in Tarantool.
+type SchemaUser struct {
+	conn tarantool.Doer // Connection interface for interacting with Tarantool.
+}
+
+// User returns a new SchemaUser instance, allowing schema-related user operations.
+func (s *Schema) User() *SchemaUser {
+	return &SchemaUser{conn: s.conn}
+}
+
+// UserExistsRequest represents a request to check if a user exists in Tarantool.
+type UserExistsRequest struct {
+	*tarantool.CallRequest // Underlying Tarantool call request.
+}
+
+// UserExistsResponse represents the response to a user existence check.
+type UserExistsResponse struct {
+	Exists bool // True if the user exists, false otherwise.
+}
+
+// DecodeMsgpack decodes the response from a Msgpack-encoded byte slice.
+func (uer *UserExistsResponse) DecodeMsgpack(d *msgpack.Decoder) error {
+	arrayLen, err := d.DecodeArrayLen()
+	if err != nil {
+		return err
+	}
+
+	// Ensure that the response array contains exactly 1 element (the "Exists" field).
+	if arrayLen != 1 {
+		return fmt.Errorf("protocol violation; expected 1 array entry, got %d", arrayLen)
+	}
+
+	// Decode the boolean value indicating whether the user exists.
+	uer.Exists, err = d.DecodeBool()
+
+	return err
+}
+
+// NewUserExistsRequest creates a new request to check if a user exists.
+func NewUserExistsRequest(username string) UserExistsRequest {
+	callReq := tarantool.NewCallRequest("box.schema.user.exists").Args([]interface{}{username})
+
+	return UserExistsRequest{
+		callReq,
+	}
+}
+
+// Exists checks if the specified user exists in Tarantool.
+func (u *SchemaUser) Exists(ctx context.Context, username string) (bool, error) {
+	// Create a request and send it to Tarantool.
+	req := NewUserExistsRequest(username).Context(ctx)
+	resp := &UserExistsResponse{}
+
+	// Execute the request and parse the response.
+	err := u.conn.Do(req).GetTyped(resp)
+
+	return resp.Exists, err
+}
+
+// UserCreateOptions represents options for creating a user in Tarantool.
+type UserCreateOptions struct {
+	IfNotExists bool   `msgpack:"if_not_exists"` // If true, prevents an error if the user already exists.
+	Password    string `msgpack:"password"`      // The password for the new user.
+}
+
+// UserCreateRequest represents a request to create a new user in Tarantool.
+type UserCreateRequest struct {
+	*tarantool.CallRequest // Underlying Tarantool call request.
+}
+
+// NewUserCreateRequest creates a new request to create a user with specified options.
+func NewUserCreateRequest(username string, options UserCreateOptions) UserCreateRequest {
+	callReq := tarantool.NewCallRequest("box.schema.user.create").Args([]interface{}{username, options})
+
+	return UserCreateRequest{
+		callReq,
+	}
+}
+
+// UserCreateResponse represents the response to a user creation request.
+type UserCreateResponse struct {
+}
+
+// DecodeMsgpack decodes the response for a user creation request.
+// In this case, the response does not contain any data.
+func (uer *UserCreateResponse) DecodeMsgpack(_ *msgpack.Decoder) error {
+	return nil
+}
+
+// Create creates a new user in Tarantool with the given username and options.
+func (u *SchemaUser) Create(ctx context.Context, username string, options UserCreateOptions) error {
+	// Create a request and send it to Tarantool.
+	req := NewUserCreateRequest(username, options).Context(ctx)
+	resp := &UserCreateResponse{}
+
+	// Execute the request and handle the response.
+	fut := u.conn.Do(req)
+
+	err := fut.GetTyped(resp)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// UserDropOptions represents options for dropping a user in Tarantool.
+type UserDropOptions struct {
+	IfExists bool `msgpack:"if_exists"` // If true, prevents an error if the user does not exist.
+}
+
+// UserDropRequest represents a request to drop a user from Tarantool.
+type UserDropRequest struct {
+	*tarantool.CallRequest // Underlying Tarantool call request.
+}
+
+// NewUserDropRequest creates a new request to drop a user with specified options.
+func NewUserDropRequest(username string, options UserDropOptions) UserDropRequest {
+	callReq := tarantool.NewCallRequest("box.schema.user.drop").Args([]interface{}{username, options})
+
+	return UserDropRequest{
+		callReq,
+	}
+}
+
+// UserDropResponse represents the response to a user drop request.
+type UserDropResponse struct {
+}
+
+// Drop drops the specified user from Tarantool, with optional conditions.
+func (u *SchemaUser) Drop(ctx context.Context, username string, options UserDropOptions) error {
+	// Create a request and send it to Tarantool.
+	req := NewUserDropRequest(username, options).Context(ctx)
+	resp := &UserCreateResponse{}
+
+	// Execute the request and handle the response.
+	fut := u.conn.Do(req)
+
+	err := fut.GetTyped(resp)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

box/tarantool_test.go

@@ -2,13 +2,15 @@ package box_test
 
 import (
 	"context"
+	"errors"
 	"log"
 	"os"
 	"testing"
 	"time"
 
 	"github.com/google/uuid"
 	"github.com/stretchr/testify/require"
+	"github.com/tarantool/go-iproto"
 	"github.com/tarantool/go-tarantool/v2"
 	"github.com/tarantool/go-tarantool/v2/box"
 	"github.com/tarantool/go-tarantool/v2/test_helpers"
@@ -61,6 +63,71 @@ func TestBox_Info(t *testing.T) {
 	validateInfo(t, resp.Info)
 }
 
+func TestBox_Sugar_Schema(t *testing.T) {
+	const (
+		username = "opensource"
+		password = "enterprise"
+	)
+
+	ctx := context.TODO()
+
+	conn, err := tarantool.Connect(ctx, dialer, tarantool.Opts{})
+	require.NoError(t, err)
+
+	b := box.New(conn)
+
+	// Create new user
+	err = b.Schema().User().Create(ctx, username, box.UserCreateOptions{Password: password})
+	require.NoError(t, err)
+
+	// Get error that user already exists
+	err = b.Schema().User().Create(ctx, username, box.UserCreateOptions{Password: password})
+	require.Error(t, err)
+
+	// Require that error code is ER_USER_EXISTS
+	var boxErr tarantool.Error
+	errors.As(err, &boxErr)
+	require.Equal(t, iproto.ER_USER_EXISTS, boxErr.Code)
+
+	// Check that already exists by exists call procedure
+	exists, err := b.Schema().User().Exists(ctx, username)
+	require.True(t, exists)
+	require.NoError(t, err)
+
+	// There is no error if IfNotExists option is true
+	err = b.Schema().User().Create(ctx, username, box.UserCreateOptions{Password: password, IfNotExists: true})
+	require.NoError(t, err)
+
+	// Check that password is valid and we can connect to tarantool with such credentials
+	var newUserDialer = tarantool.NetDialer{
+		Address:  server,
+		User:     username,
+		Password: password,
+	}
+
+	// We can connect with our new credentials
+	newUserConn, err := tarantool.Connect(ctx, newUserDialer, tarantool.Opts{})
+	require.NoError(t, err)
+	require.NotNil(t, newUserConn)
+	require.NoError(t, newUserConn.Close())
+
+	// Try to drop user
+	err = b.Schema().User().Drop(ctx, username, box.UserDropOptions{})
+	require.NoError(t, err)
+
+	// Require error cause user already deleted
+	err = b.Schema().User().Drop(ctx, username, box.UserDropOptions{})
+	require.Error(t, err)
+
+	// Require that error code is ER_NO_SUCH_USER
+	errors.As(err, &boxErr)
+	require.Equal(t, iproto.ER_NO_SUCH_USER, boxErr.Code)
+
+	// No error with option IfExists: true
+	err = b.Schema().User().Drop(ctx, username, box.UserDropOptions{IfExists: true})
+	require.NoError(t, err)
+}
+
 func runTestMain(m *testing.M) int {
 	instance, err := test_helpers.StartTarantool(test_helpers.StartOpts{
 		Dialer:       dialer,

box/testdata/config.lua

@@ -5,9 +5,9 @@ box.cfg{
 }
 
 box.schema.user.create('test', { password = 'test' , if_not_exists = true })
-box.schema.user.grant('test', 'execute', 'universe', nil, { if_not_exists = true })
+box.schema.user.grant('test', 'super', nil)
 
 -- Set listen only when every other thing is configured.
 box.cfg{
     listen = os.getenv("TEST_TNT_LISTEN"),
-}
+}