mirror of
https://git.rwth-aachen.de/acs/public/villas/web-backend-go/
synced 2025-03-30 00:00:12 +01:00
120 lines
3.1 KiB
Go
120 lines
3.1 KiB
Go
/** Package database
|
|
*
|
|
* @author Sonja Happ <sonja.happ@eonerc.rwth-aachen.de>
|
|
* @copyright 2014-2019, Institute for Automation of Complex Power Systems, EONERC
|
|
* @license GNU General Public License (version 3)
|
|
*
|
|
* VILLASweb-backend-go
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*********************************************************************************/
|
|
package database
|
|
|
|
import (
|
|
"fmt"
|
|
"log"
|
|
|
|
"github.com/jinzhu/gorm"
|
|
_ "github.com/jinzhu/gorm/dialects/postgres"
|
|
"github.com/zpatrick/go-config"
|
|
)
|
|
|
|
var DBpool *gorm.DB // database used by backend
|
|
|
|
// InitDB Initialize connection to the database
|
|
func InitDB(cfg *config.Config, clear bool) error {
|
|
name, err := cfg.String("db.name")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
host, err := cfg.String("db.host")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
user, err := cfg.StringOr("db.user", "")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
pass := ""
|
|
if user != "" {
|
|
pass, err = cfg.String("db.pass")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
sslmode, err := cfg.String("db.ssl")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
dbinfo := fmt.Sprintf("host=%s sslmode=%s dbname=%s", host, sslmode, name)
|
|
if user != "" && pass != "" {
|
|
dbinfo += fmt.Sprintf(" user=%s password=%s", user, pass)
|
|
}
|
|
|
|
db, err := gorm.Open("postgres", dbinfo)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
DBpool = db
|
|
|
|
// drop tables if parameter set
|
|
if clear {
|
|
DropTables()
|
|
log.Println("Database tables dropped")
|
|
}
|
|
|
|
MigrateModels()
|
|
log.Println("Database connection established")
|
|
|
|
return nil
|
|
}
|
|
|
|
// GetDB Connection pool to already opened DB
|
|
func GetDB() *gorm.DB {
|
|
return DBpool
|
|
}
|
|
|
|
// DropTables drops all the tables of the database (use with care!)
|
|
func DropTables() {
|
|
DBpool.DropTableIfExists(&InfrastructureComponent{})
|
|
DBpool.DropTableIfExists(&Signal{})
|
|
DBpool.DropTableIfExists(&ComponentConfiguration{})
|
|
DBpool.DropTableIfExists(&File{})
|
|
DBpool.DropTableIfExists(&Scenario{})
|
|
DBpool.DropTableIfExists(&User{})
|
|
DBpool.DropTableIfExists(&Dashboard{})
|
|
DBpool.DropTableIfExists(&Widget{})
|
|
DBpool.DropTableIfExists(&Result{})
|
|
// The following statement deletes the many to many relationship between users and scenarios
|
|
DBpool.DropTableIfExists("user_scenarios")
|
|
}
|
|
|
|
// MigrateModels AutoMigrate the models
|
|
func MigrateModels() {
|
|
DBpool.AutoMigrate(&InfrastructureComponent{})
|
|
DBpool.AutoMigrate(&Signal{})
|
|
DBpool.AutoMigrate(&ComponentConfiguration{})
|
|
DBpool.AutoMigrate(&File{})
|
|
DBpool.AutoMigrate(&Scenario{})
|
|
DBpool.AutoMigrate(&User{})
|
|
DBpool.AutoMigrate(&Dashboard{})
|
|
DBpool.AutoMigrate(&Widget{})
|
|
DBpool.AutoMigrate(&Result{})
|
|
}
|