fix: update user nickname;

feat: add database/kafka.

internal/database/db/client.go

@@ -3,25 +3,32 @@ package db
 import (
 	"context"
 	"io"
+
 	"ultone/internal/opt"
 	"ultone/internal/tool"
 
 	"gorm.io/gorm"
 )
 
-var (
-	Default *Client
+var Default *Client
+
+type DBType string
+
+const (
+	DBTypeSqlite   = "sqlite"
+	DBTypeMysql    = "mysql"
+	DBTypePostgres = "postgres"
 )
 
 type Client struct {
 	ctx       context.Context
 	cli       *gorm.DB
-	ttype     string
+	dbType    DBType
 	cfgSqlite *cfgSqlite
 }
 
-func (c *Client) Type() string {
-	return c.ttype
+func (c *Client) Type() DBType {
+	return c.dbType
 }
 
 func (c *Client) Session(ctxs ...context.Context) *gorm.DB {
@@ -49,7 +56,7 @@ func (c *Client) Close() {
 // Dump
 // Only for sqlite with mem mode to dump data to bytes(io.Reader)
 func (c *Client) Dump() (reader io.ReadSeekCloser, ok bool) {
-	if c.ttype != "sqlite" {
+	if c.dbType != DBTypeSqlite {
 		return nil, false
 	}