open-im-server/src/common/db/mysql.go

package db

import (
	"Open_IM/src/common/config"
	"fmt"
	"github.com/jinzhu/gorm"
	_ "github.com/jinzhu/gorm/dialects/mysql"
	"sync"
	"time"
)

type mysqlDB struct {
	sync.RWMutex
	dbMap map[string]*gorm.DB
}

func (m *mysqlDB) DefaultGormDB() (*gorm.DB, error) {
	return m.GormDB(config.Config.Mysql.DBAddress[0], config.Config.Mysql.DBDatabaseName)
}

func (m *mysqlDB) GormDB(dbAddress, dbName string) (*gorm.DB, error) {
	m.Lock()
	defer m.Unlock()

	k := key(dbAddress, dbName)
	if _, ok := m.dbMap[k]; !ok {
		if err := m.open(dbAddress, dbName); err != nil {
			return nil, err
		}
	}
	return m.dbMap[k], nil
}

func (m *mysqlDB) open(dbAddress, dbName string) error {
	dsn := fmt.Sprintf("%s:%s@tcp(%s)/%s?charset=utf8mb4&parseTime=true&loc=Local",
		config.Config.Mysql.DBUserName, config.Config.Mysql.DBPassword, dbAddress, dbName)
	db, err := gorm.Open("mysql", dsn)
	if err != nil {
		return err
	}

	db.SingularTable(true)
	db.DB().SetMaxOpenConns(config.Config.Mysql.DBMaxOpenConns)
	db.DB().SetMaxIdleConns(config.Config.Mysql.DBMaxIdleConns)
	db.DB().SetConnMaxLifetime(time.Duration(config.Config.Mysql.DBMaxLifeTime) * time.Second)

	if m.dbMap == nil {
		m.dbMap = make(map[string]*gorm.DB)
	}
	k := key(dbAddress, dbName)
	m.dbMap[k] = db
	return nil
}