Merge pull request #291 from xuewenG/backup-database

自动备份数据库

backend/backup.go

@@ -0,0 +1,85 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+	"path"
+	"time"
+
+	"github.com/glebarez/sqlite"
+	fs_util "github.com/kingwrcy/moments/util"
+	"github.com/kingwrcy/moments/vo"
+	"github.com/rs/zerolog"
+	"gorm.io/gorm"
+)
+
+func backupDatabase(log zerolog.Logger, cfg *vo.AppConfig) {
+	if !fs_util.Exists(cfg.DB) {
+		log.Debug().Msgf("原数据库不存在, 所以无需备份数据库")
+		return
+	}
+
+	db, err := gorm.Open(sqlite.Open(cfg.DB))
+	if err != nil {
+		log.Fatal().Msgf("打开原数据库出错, err: %v", err)
+		return
+	}
+
+	var sysConfig string
+	db.Raw("SELECT content FROM SysConfig").Scan(&sysConfig)
+
+	var config map[string]interface{}
+	err = json.Unmarshal([]byte(sysConfig), &config)
+	if err != nil {
+		log.Fatal().Msgf("反序列化原配置出错, err: %v", err)
+		return
+	}
+
+	version, ok := config["version"].(string)
+	if !ok {
+		version = "unknown"
+	}
+
+	if version == cfg.Version {
+		log.Debug().Msgf("当前版本和上次启动时的版本一致, 所以无需备份数据库, version: %s", version)
+		return
+	}
+
+	log.Info().Msgf("开始备份数据库")
+
+	sourceFile, err := os.Open(cfg.DB)
+	if err != nil {
+		log.Error().Msgf("打开原数据库文件出错, err: %v", err)
+		return
+	}
+	defer sourceFile.Close()
+
+	now := time.Now()
+	datetime := now.Format("2006-01-02-15-04-05")
+	destinationFileName := fmt.Sprintf("backup-%s-%s.sqlite3", datetime, version)
+
+	destinationFile, err := os.Create(path.Join(path.Dir(cfg.DB), destinationFileName))
+	if err != nil {
+		log.Error().Msgf("创建备份数据库文件失败, err: %v", err)
+		return
+	}
+	defer destinationFile.Close()
+
+	_, err = io.Copy(destinationFile, sourceFile)
+	if err != nil {
+		log.Error().Msgf("复制数据库文件失败, err: %v", err)
+		return
+	}
+
+	log.Info().Msgf("数据库备份完成")
+
+	config["version"] = cfg.Version
+	content, err := json.Marshal(config)
+	if err != nil {
+		log.Error().Msgf("序列化新配置失败, err: %v", err)
+	}
+
+	db.Exec("UPDATE SysConfig SET content = ?", content)
+}

backend/main.go

@@ -64,6 +64,8 @@ func main() {
 	cfg.Version = version
 	cfg.CommitId = commitId
 
+	backupDatabase(myLogger, &cfg)
+
 	do.Provide(injector, db.NewDB)
 	do.Provide(injector, newEchoEngine)
 	do.Provide(injector, handler.NewBaseHandler)