package sqlx

import (
	"database/sql"
	"git.diulo.com/mogfee/kit/syncx"
	"io"
	"time"
)

const (
	maxIdleConns = 64
	maxOpenConns = 64
	maxLifetime  = time.Minute
)

var connManager = syncx.NewResourceManager()

func getCachedSqlConn(driverName string, server string) (*sql.DB, error) {
	val, err := connManager.GetResource(server, func() (io.Closer, error) {
		return newDBConnection(driverName, server)
	})
	if err != nil {
		return nil, err
	}
	return val.(*sql.DB), nil
}

func getSqlConn(driverName, server string) (*sql.DB, error) {
	return getCachedSqlConn(driverName, server)
}
func newDBConnection(driverName, datasource string) (*sql.DB, error) {
	conn, err := sql.Open(driverName, datasource)
	if err != nil {
		return nil, err
	}
	conn.SetMaxIdleConns(maxIdleConns)
	conn.SetMaxOpenConns(maxOpenConns)
	conn.SetConnMaxLifetime(maxLifetime)
	if err = conn.Ping(); err != nil {
		return nil, err
	}
	return conn, nil
}