mirror of
https://gitee.com/dromara/mayfly-go
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477 lines
12 KiB
Go
477 lines
12 KiB
Go
package application
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import (
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"database/sql"
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"fmt"
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"mayfly-go/internal/constant"
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"mayfly-go/internal/db/domain/entity"
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"mayfly-go/internal/db/domain/repository"
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"mayfly-go/internal/machine/infrastructure/machine"
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"mayfly-go/pkg/biz"
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"mayfly-go/pkg/cache"
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"mayfly-go/pkg/global"
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"mayfly-go/pkg/model"
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"mayfly-go/pkg/utils"
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"reflect"
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"strconv"
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"strings"
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"sync"
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"time"
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)
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type Db interface {
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// 分页获取
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GetPageList(condition *entity.DbQuery, pageParam *model.PageParam, toEntity interface{}, orderBy ...string) *model.PageResult
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Count(condition *entity.DbQuery) int64
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// 根据条件获取
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GetDbBy(condition *entity.Db, cols ...string) error
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// 根据id获取
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GetById(id uint64, cols ...string) *entity.Db
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Save(entity *entity.Db)
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// 删除数据库信息
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Delete(id uint64)
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// 获取数据库连接实例
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// @param id 数据库实例id
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// @param db 数据库
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GetDbInstance(id uint64, db string) *DbInstance
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// 获取数据库实例的所有数据库列表
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GetDatabases(entity *entity.Db) []string
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}
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func newDbApp(dbRepo repository.Db, dbSqlRepo repository.DbSql) Db {
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return &dbAppImpl{
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dbRepo: dbRepo,
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dbSqlRepo: dbSqlRepo,
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}
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}
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type dbAppImpl struct {
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dbRepo repository.Db
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dbSqlRepo repository.DbSql
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}
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// 分页获取数据库信息列表
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func (d *dbAppImpl) GetPageList(condition *entity.DbQuery, pageParam *model.PageParam, toEntity interface{}, orderBy ...string) *model.PageResult {
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return d.dbRepo.GetDbList(condition, pageParam, toEntity, orderBy...)
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}
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func (d *dbAppImpl) Count(condition *entity.DbQuery) int64 {
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return d.dbRepo.Count(condition)
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}
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// 根据条件获取
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func (d *dbAppImpl) GetDbBy(condition *entity.Db, cols ...string) error {
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return d.dbRepo.GetDb(condition, cols...)
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}
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// 根据id获取
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func (d *dbAppImpl) GetById(id uint64, cols ...string) *entity.Db {
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return d.dbRepo.GetById(id, cols...)
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}
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func (d *dbAppImpl) Save(dbEntity *entity.Db) {
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// 默认tcp连接
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dbEntity.Network = dbEntity.GetNetwork()
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// 测试连接
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if dbEntity.Password != "" {
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TestConnection(dbEntity)
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}
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// 查找是否存在该库
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oldDb := &entity.Db{Host: dbEntity.Host, Port: dbEntity.Port, Username: dbEntity.Username}
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if dbEntity.SshTunnelMachineId > 0 {
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oldDb.SshTunnelMachineId = dbEntity.SshTunnelMachineId
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}
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err := d.GetDbBy(oldDb)
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if dbEntity.Id == 0 {
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biz.NotEmpty(dbEntity.Password, "密码不能为空")
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biz.IsTrue(err != nil, "该数据库实例已存在")
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dbEntity.PwdEncrypt()
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d.dbRepo.Insert(dbEntity)
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return
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}
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// 如果存在该库，则校验修改的库是否为该库
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if err == nil {
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biz.IsTrue(oldDb.Id == dbEntity.Id, "该数据库实例已存在")
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}
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dbId := dbEntity.Id
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old := d.GetById(dbId)
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var oldDbs []interface{}
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for _, v := range strings.Split(old.Database, " ") {
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// 关闭数据库连接
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CloseDb(dbEntity.Id, v)
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oldDbs = append(oldDbs, v)
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}
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var newDbs []interface{}
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for _, v := range strings.Split(dbEntity.Database, " ") {
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newDbs = append(newDbs, v)
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}
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// 比较新旧数据库列表，需要将移除的数据库相关联的信息删除
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_, delDb, _ := utils.ArrayCompare(newDbs, oldDbs, func(i1, i2 interface{}) bool {
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return i1.(string) == i2.(string)
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})
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for _, v := range delDb {
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// 删除该库关联的所有sql记录
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d.dbSqlRepo.DeleteBy(&entity.DbSql{DbId: dbId, Db: v.(string)})
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}
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dbEntity.PwdEncrypt()
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d.dbRepo.Update(dbEntity)
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}
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func (d *dbAppImpl) Delete(id uint64) {
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db := d.GetById(id)
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dbs := strings.Split(db.Database, " ")
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for _, v := range dbs {
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// 关闭连接
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CloseDb(id, v)
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}
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d.dbRepo.Delete(id)
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// 删除该库下用户保存的所有sql信息
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d.dbSqlRepo.DeleteBy(&entity.DbSql{DbId: id})
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}
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func (d *dbAppImpl) GetDatabases(ed *entity.Db) []string {
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ed.Network = ed.GetNetwork()
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databases := make([]string, 0)
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var dbConn *sql.DB
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var metaDb string
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var getDatabasesSql string
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if ed.Type == entity.DbTypeMysql {
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metaDb = "information_schema"
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getDatabasesSql = "SELECT SCHEMA_NAME AS dbname FROM SCHEMATA"
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} else {
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metaDb = "postgres"
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getDatabasesSql = "SELECT datname AS dbname FROM pg_database"
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}
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dbConn, err := GetDbConn(ed, metaDb)
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biz.ErrIsNilAppendErr(err, "数据库连接失败: %s")
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defer dbConn.Close()
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_, res, err := SelectDataByDb(dbConn, getDatabasesSql)
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biz.ErrIsNilAppendErr(err, "获取数据库列表失败")
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for _, re := range res {
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databases = append(databases, re["dbname"].(string))
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}
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return databases
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}
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var mutex sync.Mutex
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func (da *dbAppImpl) GetDbInstance(id uint64, db string) *DbInstance {
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cacheKey := GetDbCacheKey(id, db)
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// Id不为0，则为需要缓存
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needCache := id != 0
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if needCache {
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load, ok := dbCache.Get(cacheKey)
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if ok {
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return load.(*DbInstance)
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}
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}
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mutex.Lock()
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defer mutex.Unlock()
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d := da.GetById(id)
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biz.NotNil(d, "数据库信息不存在")
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biz.IsTrue(strings.Contains(d.Database, db), "未配置该库的操作权限")
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// 密码解密
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d.PwdDecrypt()
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dbInfo := new(DbInfo)
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utils.Copy(dbInfo, d)
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dbInfo.Database = db
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dbi := &DbInstance{Id: cacheKey, Info: dbInfo}
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DB, err := GetDbConn(d, db)
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if err != nil {
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dbi.Close()
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global.Log.Errorf("连接db失败: %s:%d/%s", d.Host, d.Port, db)
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panic(biz.NewBizErr(fmt.Sprintf("数据库连接失败: %s", err.Error())))
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}
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// 最大连接周期，超过时间的连接就close
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// DB.SetConnMaxLifetime(100 * time.Second)
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// 设置最大连接数
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DB.SetMaxOpenConns(5)
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// 设置闲置连接数
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DB.SetMaxIdleConns(1)
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dbi.db = DB
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global.Log.Infof("连接db: %s:%d/%s", d.Host, d.Port, db)
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if needCache {
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dbCache.Put(cacheKey, dbi)
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}
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return dbi
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}
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//---------------------------------------- db instance ------------------------------------
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type DbInfo struct {
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Id uint64
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Name string
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Type string // 类型，mysql oracle等
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Host string
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Port int
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Network string
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Username string
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TagPath string
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Database string
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SshTunnelMachineId int
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}
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// 获取记录日志的描述
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func (d *DbInfo) GetLogDesc() string {
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return fmt.Sprintf("DB[id=%d, tag=%s, name=%s, ip=%s:%d, database=%s]", d.Id, d.TagPath, d.Name, d.Host, d.Port, d.Database)
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}
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// db实例
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type DbInstance struct {
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Id string
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Info *DbInfo
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db *sql.DB
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}
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// 执行查询语句
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// 依次返回 列名数组，结果map，错误
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func (d *DbInstance) SelectData(execSql string) ([]string, []map[string]any, error) {
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return SelectDataByDb(d.db, execSql)
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}
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// 将查询结果映射至struct，可具体参考sqlx库
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func (d *DbInstance) SelectData2Struct(execSql string, dest any) error {
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return Select2StructByDb(d.db, execSql, dest)
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}
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// 执行 update, insert, delete，建表等sql
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// 返回影响条数和错误
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func (d *DbInstance) Exec(sql string) (int64, error) {
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res, err := d.db.Exec(sql)
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if err != nil {
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return 0, err
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}
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return res.RowsAffected()
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}
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// 获取数据库元信息实现接口
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func (di *DbInstance) GetMeta() DbMetadata {
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dbType := di.Info.Type
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if dbType == entity.DbTypeMysql {
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return &MysqlMetadata{di: di}
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}
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if dbType == entity.DbTypePostgres {
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return &PgsqlMetadata{di: di}
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}
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return nil
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}
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// 关闭连接
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func (d *DbInstance) Close() {
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if d.db != nil {
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if err := d.db.Close(); err != nil {
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global.Log.Errorf("关闭数据库实例[%s]连接失败: %s", d.Id, err.Error())
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}
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d.db = nil
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}
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}
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//------------------------------------------------------------------------------
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// 客户端连接缓存，指定时间内没有访问则会被关闭, key为数据库实例id:数据库
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var dbCache = cache.NewTimedCache(constant.DbConnExpireTime, 5*time.Second).
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WithUpdateAccessTime(true).
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OnEvicted(func(key interface{}, value interface{}) {
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global.Log.Info(fmt.Sprintf("删除db连接缓存 id = %s", key))
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value.(*DbInstance).Close()
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})
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func init() {
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machine.AddCheckSshTunnelMachineUseFunc(func(machineId int) bool {
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// 遍历所有db连接实例，若存在db实例使用该ssh隧道机器，则返回true，表示还在使用中...
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items := dbCache.Items()
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for _, v := range items {
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if v.Value.(*DbInstance).Info.SshTunnelMachineId == machineId {
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return true
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}
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}
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return false
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})
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}
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func GetDbCacheKey(dbId uint64, db string) string {
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return fmt.Sprintf("%d:%s", dbId, db)
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}
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func GetDbInstanceByCache(id string) *DbInstance {
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if load, ok := dbCache.Get(id); ok {
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return load.(*DbInstance)
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}
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return nil
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}
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func TestConnection(d *entity.Db) {
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// 验证第一个库是否可以连接即可
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DB, err := GetDbConn(d, strings.Split(d.Database, " ")[0])
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biz.ErrIsNilAppendErr(err, "数据库连接失败: %s")
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defer DB.Close()
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}
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// 获取数据库连接
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func GetDbConn(d *entity.Db, db string) (*sql.DB, error) {
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var DB *sql.DB
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var err error
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if d.Type == entity.DbTypeMysql {
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DB, err = getMysqlDB(d, db)
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} else if d.Type == entity.DbTypePostgres {
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DB, err = getPgsqlDB(d, db)
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}
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if err != nil {
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return nil, err
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}
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err = DB.Ping()
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if err != nil {
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DB.Close()
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return nil, err
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}
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return DB, nil
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}
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func SelectDataByDb(db *sql.DB, selectSql string) ([]string, []map[string]interface{}, error) {
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rows, err := db.Query(selectSql)
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if err != nil {
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return nil, nil, err
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}
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// rows对象一定要close掉，如果出错，不关掉则会很迅速的达到设置最大连接数，
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// 后面的链接过来直接报错或拒绝，实际上也没有起效果
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defer func() {
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if rows != nil {
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rows.Close()
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}
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}()
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colTypes, _ := rows.ColumnTypes()
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// 这里表示一行填充数据
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scans := make([]interface{}, len(colTypes))
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// 这里表示一行所有列的值，用[]byte表示
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vals := make([][]byte, len(colTypes))
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// 这里scans引用vals，把数据填充到[]byte里
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for k := range vals {
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scans[k] = &vals[k]
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}
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result := make([]map[string]interface{}, 0)
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// 列名用于前端表头名称按照数据库与查询字段顺序显示
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colNames := make([]string, 0)
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// 是否第一次遍历，列名数组只需第一次遍历时加入
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isFirst := true
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for rows.Next() {
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// 不Scan也会导致等待，该链接实际处于未工作的状态，然后也会导致连接数迅速达到最大
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err := rows.Scan(scans...)
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if err != nil {
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return nil, nil, err
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}
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// 每行数据
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rowData := make(map[string]interface{})
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// 把vals中的数据复制到row中
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for i, v := range vals {
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colType := colTypes[i]
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colName := colType.Name()
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// 如果是第一行，则将列名加入到列信息中，由于map是无序的，所有需要返回列名的有序数组
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if isFirst {
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colNames = append(colNames, colName)
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}
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rowData[colName] = valueConvert(v, colType)
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}
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// 放入结果集
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result = append(result, rowData)
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isFirst = false
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}
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return colNames, result, nil
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}
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// 将查询的值转为对应列类型的实际值，不全部转为字符串
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func valueConvert(data []byte, colType *sql.ColumnType) interface{} {
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if data == nil {
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return nil
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}
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// 列的数据库类型名
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colDatabaseTypeName := strings.ToLower(colType.DatabaseTypeName())
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// 如果类型是bit，则直接返回第一个字节即可
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if strings.Contains(colDatabaseTypeName, "bit") {
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return data[0]
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}
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// 这里把[]byte数据转成string
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stringV := string(data)
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if stringV == "" {
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return ""
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}
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colScanType := strings.ToLower(colType.ScanType().Name())
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if strings.Contains(colScanType, "int") {
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// 如果长度超过16位，则返回字符串，因为前端js长度大于16会丢失精度
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if len(stringV) > 16 {
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return stringV
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}
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intV, _ := strconv.Atoi(stringV)
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switch colType.ScanType().Kind() {
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case reflect.Int8:
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return int8(intV)
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case reflect.Uint8:
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return uint8(intV)
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case reflect.Int64:
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return int64(intV)
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case reflect.Uint64:
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return uint64(intV)
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case reflect.Uint:
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return uint(intV)
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default:
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return intV
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}
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}
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if strings.Contains(colScanType, "float") || strings.Contains(colDatabaseTypeName, "decimal") {
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floatV, _ := strconv.ParseFloat(stringV, 64)
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return floatV
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}
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return stringV
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}
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// 查询数据结果映射至struct。可参考sqlx库
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func Select2StructByDb(db *sql.DB, selectSql string, dest interface{}) error {
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rows, err := db.Query(selectSql)
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if err != nil {
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return err
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}
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// rows对象一定要close掉，如果出错，不关掉则会很迅速的达到设置最大连接数，
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// 后面的链接过来直接报错或拒绝，实际上也没有起效果
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defer func() {
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if rows != nil {
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rows.Close()
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}
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}()
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return scanAll(rows, dest, false)
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}
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// 删除db缓存并关闭该数据库所有连接
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func CloseDb(dbId uint64, db string) {
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dbCache.Delete(GetDbCacheKey(dbId, db))
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}
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