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