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mysql.go
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mysql.go
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// MIT License
// Copyright (c) The RAI Authors
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package dbdrivers
import (
"encoding/json"
"fmt"
"time"
"github.com/retail-ai-inc/bean/aes"
"gorm.io/datatypes"
"gorm.io/driver/mysql"
"gorm.io/gorm"
"gorm.io/gorm/logger"
)
type SQLConfig struct {
Master *struct {
Database string
Username string
Password string
Host string
Port string
}
MaxIdleConnections int
MaxOpenConnections int
MaxConnectionLifeTime time.Duration
MaxIdleConnectionLifeTime time.Duration
Debug bool
}
// TenantConnections represent a tenant database configuration record in master database
type TenantConnections struct {
ID uint64 `gorm:"primary_key;AUTO_INCREMENT;column:Id"`
UUID string `gorm:"type:CHAR(36);not null;unique;column:Uuid"`
TenantID uint64 `gorm:"not null;column:TenantId"`
Code string `gorm:"type:VARCHAR(20);not null;unique;column:Code"`
Connections datatypes.JSON `gorm:"not null;column:Connections"`
CreatedBy uint64 `gorm:"not null;default:0;column:CreatedBy"`
UpdatedBy uint64 `gorm:"not null;default:0;column:UpdatedBy"`
DeletedBy uint64 `gorm:"default:NULL;column:DeletedBy"`
CreatedAt time.Time `gorm:"type:timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP;column:CreatedAt"`
UpdatedAt time.Time `gorm:"type:timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP;column:UpdatedAt"`
DeletedAt gorm.DeletedAt `gorm:"type:timestamp NULL DEFAULT NULL;column:DeletedAt"`
}
func (TenantConnections) TableName() string {
return "TenantConnections"
}
// InitMysqlMasterConn returns mysql master db connection.
func InitMysqlMasterConn(config SQLConfig) (*gorm.DB, string) {
masterCfg := config.Master
if masterCfg != nil && masterCfg.Database != "" {
return connectMysqlDB(
masterCfg.Username, masterCfg.Password, masterCfg.Host, masterCfg.Port, masterCfg.Database,
config.MaxIdleConnections, config.MaxOpenConnections, config.MaxConnectionLifeTime, config.MaxIdleConnectionLifeTime,
config.Debug,
)
}
return nil, ""
}
func InitMysqlTenantConns(config SQLConfig, master *gorm.DB, tenantAlterDbHostParam, tenantDBPassPhraseKey string) (map[uint64]*gorm.DB, map[uint64]string) {
err := createTenantConnectionsTableIfNotExist(master)
if err != nil {
panic(err)
}
tenantCfgs := GetAllTenantCfgs(master)
return getAllMysqlTenantDB(config, tenantCfgs, tenantAlterDbHostParam, tenantDBPassPhraseKey)
}
// GetAllTenantCfgs return all Tenant data from master db.
func GetAllTenantCfgs(db *gorm.DB) []*TenantConnections {
var tt []*TenantConnections
err := db.Table("TenantConnections").Find(&tt).Error
if err != nil {
panic(err)
}
// TODO: save the config in memory
return tt
}
// getAllMysqlTenantDB returns all tenant db connection.
func getAllMysqlTenantDB(config SQLConfig, tenantCfgs []*TenantConnections,
tenantAlterDbHostParam, tenantDBPassPhraseKey string) (map[uint64]*gorm.DB, map[uint64]string) {
mysqlConns := make(map[uint64]*gorm.DB, len(tenantCfgs))
mysqlDBNames := make(map[uint64]string, len(tenantCfgs))
for _, t := range tenantCfgs {
var cfgsMap map[string]map[string]interface{}
var err error
if t.Connections != nil {
if err = json.Unmarshal(t.Connections, &cfgsMap); err != nil {
panic(err)
}
}
// IMPORTANT: Check the `mysql` object exist in the Connections column or not.
if mysqlCfg, ok := cfgsMap["mysql"]; ok {
userName := mysqlCfg["username"].(string)
password := mysqlCfg["password"].(string)
// IMPORTANT: If tenant database password is encrypted in master db config.
if tenantDBPassPhraseKey != "" {
password, err = aes.BeanAESDecrypt(tenantDBPassPhraseKey, password)
if err != nil {
panic(err)
}
}
host := mysqlCfg["host"].(string)
// IMPORTANT - If a command or service wants to use a different `host` parameter for tenant database connection
// then it's easy to do just by passing that parameter string name using `bean.TenantAlterDbHostParam`.
// Therfore, `bean` will overwrite all host string in `TenantConnections`.`Connections` JSON.
if tenantAlterDbHostParam != "" && mysqlCfg[tenantAlterDbHostParam] != nil {
host = mysqlCfg[tenantAlterDbHostParam].(string)
}
port := mysqlCfg["port"].(string)
dbName := mysqlCfg["database"].(string)
mysqlConns[t.TenantID], mysqlDBNames[t.TenantID] = connectMysqlDB(
userName, password, host, port, dbName, config.MaxIdleConnections,
config.MaxOpenConnections, config.MaxConnectionLifeTime, config.MaxIdleConnectionLifeTime,
config.Debug,
)
} else {
mysqlConns[t.TenantID], mysqlDBNames[t.TenantID] = nil, ""
}
}
return mysqlConns, mysqlDBNames
}
func connectMysqlDB(userName, password, host, port, dbName string,
maxIdleConnections, maxOpenConnections int, maxConnectionLifeTime, maxIdleConnectionLifeTime time.Duration,
debug bool) (*gorm.DB, string) {
dsn := fmt.Sprintf(
"%s:%s@tcp(%s:%s)/%s?parseTime=true&multiStatements=true",
userName, password, host, port, dbName,
)
var db *gorm.DB
var err error
if debug {
db, err = gorm.Open(mysql.Open(dsn), &gorm.Config{Logger: logger.Default.LogMode(logger.Info)})
} else {
db, err = gorm.Open(mysql.Open(dsn), &gorm.Config{Logger: logger.Default.LogMode(logger.Silent)})
}
if err != nil {
panic(err)
}
sqlDB, err := db.DB()
if err != nil {
panic(err)
}
sqlDB.SetMaxIdleConns(maxIdleConnections)
sqlDB.SetMaxOpenConns(maxOpenConnections)
if maxConnectionLifeTime > 0 {
sqlDB.SetConnMaxLifetime(maxConnectionLifeTime)
}
if maxIdleConnectionLifeTime > 0 {
sqlDB.SetConnMaxIdleTime(maxIdleConnectionLifeTime)
}
return db, dbName
}
func createTenantConnectionsTableIfNotExist(masterDb *gorm.DB) error {
if !masterDb.Migrator().HasTable("TenantConnections") {
err := masterDb.Migrator().CreateTable(&TenantConnections{})
return err
}
return nil
}