Use session when creating user (#2638)

models/user.go

@@ -591,19 +591,23 @@ func (u *User) IsMailable() bool {
 	return u.IsActive
 }
 
-// IsUserExist checks if given user name exist,
-// the user name should be noncased unique.
-// If uid is presented, then check will rule out that one,
-// it is used when update a user name in settings page.
-func IsUserExist(uid int64, name string) (bool, error) {
+func isUserExist(e Engine, uid int64, name string) (bool, error) {
 	if len(name) == 0 {
 		return false, nil
 	}
-	return x.
+	return e.
 		Where("id!=?", uid).
 		Get(&User{LowerName: strings.ToLower(name)})
 }
 
+// IsUserExist checks if given user name exist,
+// the user name should be noncased unique.
+// If uid is presented, then check will rule out that one,
+// it is used when update a user name in settings page.
+func IsUserExist(uid int64, name string) (bool, error) {
+	return isUserExist(x, uid, name)
+}
+
 // GetUserSalt returns a random user salt token.
 func GetUserSalt() (string, error) {
 	return base.GetRandomString(10)
@@ -659,24 +663,30 @@ func CreateUser(u *User) (err error) {
 		return err
 	}
 
-	isExist, err := IsUserExist(0, u.Name)
+	sess := x.NewSession()
+	defer sess.Close()
+	if err = sess.Begin(); err != nil {
+		return err
+	}
+
+	isExist, err := isUserExist(sess, 0, u.Name)
 	if err != nil {
 		return err
 	} else if isExist {
 		return ErrUserAlreadyExist{u.Name}
 	}
 
 	u.Email = strings.ToLower(u.Email)
-	has, err := x.
+	isExist, err = sess.
 		Where("email=?", u.Email).
 		Get(new(User))
 	if err != nil {
 		return err
-	} else if has {
+	} else if isExist {
 		return ErrEmailAlreadyUsed{u.Email}
 	}
 
-	isExist, err = IsEmailUsed(u.Email)
+	isExist, err = isEmailUsed(sess, u.Email)
 	if err != nil {
 		return err
 	} else if isExist {
@@ -698,12 +708,6 @@ func CreateUser(u *User) (err error) {
 	u.AllowCreateOrganization = setting.Service.DefaultAllowCreateOrganization
 	u.MaxRepoCreation = -1
 
-	sess := x.NewSession()
-	defer sess.Close()
-	if err = sess.Begin(); err != nil {
-		return err
-	}
-
 	if _, err = sess.Insert(u); err != nil {
 		return err
 	} else if err = os.MkdirAll(UserPath(u.Name), os.ModePerm); err != nil {