modularize main function, use DBpool instead of local DB in database package and all testing functions

database/database.go

@@ -34,29 +34,29 @@ import (
 var DBpool *gorm.DB // database used by backend
 
 // Initialize connection to the database
-func InitDB(cfg *config.Config) (*gorm.DB, error) {
+func InitDB(cfg *config.Config) error {
 	name, err := cfg.String("db.name")
 	if err != nil {
-		return nil, err
+		return err
 	}
 	host, err := cfg.String("db.host")
 	if err != nil {
-		return nil, err
+		return err
 	}
 	user, err := cfg.String("db.user")
 	if err != nil && !strings.Contains(err.Error(), "Required setting 'db.user' not set") {
-		return nil, err
+		return err
 	}
 	pass := ""
 	if user != "" {
 		pass, err = cfg.String("db.pass")
 		if err != nil {
-			return nil, err
+			return err
 		}
 	}
 	sslmode, err := cfg.String("db.ssl")
 	if err != nil {
-		return nil, err
+		return err
 	}
 
 	dbinfo := fmt.Sprintf("host=%s sslmode=%s dbname=%s", host, sslmode, name)
@@ -66,14 +66,14 @@ func InitDB(cfg *config.Config) (*gorm.DB, error) {
 
 	db, err := gorm.Open("postgres", dbinfo)
 	if err != nil {
-		return nil, err
+		return err
 	}
 
 	DBpool = db
-	MigrateModels(db)
+	MigrateModels()
 	log.Println("Database connection established")
 
-	return db, nil
+	return nil
 }
 
 // Connection pool to already opened DB
@@ -84,27 +84,27 @@ func GetDB() *gorm.DB {
 // Drop all the tables of the database
 // TODO: Remove that function from the codebase and substitute the body
 // to the Dummy*() where it is called
-func DropTables(db *gorm.DB) {
+func DropTables() {
-	db.DropTableIfExists(&InfrastructureComponent{})
+	DBpool.DropTableIfExists(&InfrastructureComponent{})
-	db.DropTableIfExists(&Signal{})
+	DBpool.DropTableIfExists(&Signal{})
-	db.DropTableIfExists(&ComponentConfiguration{})
+	DBpool.DropTableIfExists(&ComponentConfiguration{})
-	db.DropTableIfExists(&File{})
+	DBpool.DropTableIfExists(&File{})
-	db.DropTableIfExists(&Scenario{})
+	DBpool.DropTableIfExists(&Scenario{})
-	db.DropTableIfExists(&User{})
+	DBpool.DropTableIfExists(&User{})
-	db.DropTableIfExists(&Dashboard{})
+	DBpool.DropTableIfExists(&Dashboard{})
-	db.DropTableIfExists(&Widget{})
+	DBpool.DropTableIfExists(&Widget{})
 	// The following statement deletes the many to many relationship between users and scenarios
-	db.DropTableIfExists("user_scenarios")
+	DBpool.DropTableIfExists("user_scenarios")
 }
 
 // AutoMigrate the models
-func MigrateModels(db *gorm.DB) {
+func MigrateModels() {
-	db.AutoMigrate(&InfrastructureComponent{})
+	DBpool.AutoMigrate(&InfrastructureComponent{})
-	db.AutoMigrate(&Signal{})
+	DBpool.AutoMigrate(&Signal{})
-	db.AutoMigrate(&ComponentConfiguration{})
+	DBpool.AutoMigrate(&ComponentConfiguration{})
-	db.AutoMigrate(&File{})
+	DBpool.AutoMigrate(&File{})
-	db.AutoMigrate(&Scenario{})
+	DBpool.AutoMigrate(&Scenario{})
-	db.AutoMigrate(&User{})
+	DBpool.AutoMigrate(&User{})
-	db.AutoMigrate(&Dashboard{})
+	DBpool.AutoMigrate(&Dashboard{})
-	db.AutoMigrate(&Widget{})
+	DBpool.AutoMigrate(&Widget{})
 }

database/database_test.go

@@ -23,7 +23,6 @@ package database
 
 import (
 	"fmt"
-	"github.com/jinzhu/gorm"
 	"log"
 	"os"
 	"testing"
@@ -32,33 +31,31 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-var db *gorm.DB
-
 func TestMain(m *testing.M) {
 	err := configuration.InitConfig()
 	if err != nil {
 		panic(m)
 	}
 
-	db, err = InitDB(configuration.GolbalConfig)
+	err = InitDB(configuration.GolbalConfig)
 	if err != nil {
 		panic(m)
 	}
 
 	// Verify that you can connect to the database
-	err = db.DB().Ping()
+	err = DBpool.DB().Ping()
 	if err != nil {
 		log.Panic("Error: DB must ping to run tests")
 	}
 
-	defer db.Close()
+	defer DBpool.Close()
 	os.Exit(m.Run())
 }
 
 func TestUserAssociations(t *testing.T) {
 
-	DropTables(db)
+	DropTables()
-	MigrateModels(db)
+	MigrateModels()
 
 	// create copies of global test data
 	scenarioA := ScenarioA
@@ -68,28 +65,28 @@ func TestUserAssociations(t *testing.T) {
 	userB := UserB
 
 	// add three users to DB
-	assert.NoError(t, db.Create(&user0).Error) // Admin
+	assert.NoError(t, DBpool.Create(&user0).Error) // Admin
-	assert.NoError(t, db.Create(&userA).Error) // Normal User
+	assert.NoError(t, DBpool.Create(&userA).Error) // Normal User
-	assert.NoError(t, db.Create(&userB).Error) // Normal User
+	assert.NoError(t, DBpool.Create(&userB).Error) // Normal User
 
 	// add two scenarios to DB
-	assert.NoError(t, db.Create(&scenarioA).Error)
+	assert.NoError(t, DBpool.Create(&scenarioA).Error)
-	assert.NoError(t, db.Create(&scenarioB).Error)
+	assert.NoError(t, DBpool.Create(&scenarioB).Error)
 
 	// add many-to-many associations between users and scenarios
 	// User HM Scenarios, Scenario HM Users (Many-to-Many)
-	assert.NoError(t, db.Model(&userA).Association("Scenarios").Append(&scenarioA).Error)
+	assert.NoError(t, DBpool.Model(&userA).Association("Scenarios").Append(&scenarioA).Error)
-	assert.NoError(t, db.Model(&userA).Association("Scenarios").Append(&scenarioB).Error)
+	assert.NoError(t, DBpool.Model(&userA).Association("Scenarios").Append(&scenarioB).Error)
-	assert.NoError(t, db.Model(&userB).Association("Scenarios").Append(&scenarioA).Error)
+	assert.NoError(t, DBpool.Model(&userB).Association("Scenarios").Append(&scenarioA).Error)
-	assert.NoError(t, db.Model(&userB).Association("Scenarios").Append(&scenarioB).Error)
+	assert.NoError(t, DBpool.Model(&userB).Association("Scenarios").Append(&scenarioB).Error)
 
 	var usr1 User
-	assert.NoError(t, db.Find(&usr1, "ID = ?", 2).Error, fmt.Sprintf("Find User with ID=2"))
+	assert.NoError(t, DBpool.Find(&usr1, "ID = ?", 2).Error, fmt.Sprintf("Find User with ID=2"))
 	assert.EqualValues(t, "User_A", usr1.Username)
 
 	// Get scenarios of usr1
 	var scenarios []Scenario
-	assert.NoError(t, db.Model(&usr1).Related(&scenarios, "Scenarios").Error)
+	assert.NoError(t, DBpool.Model(&usr1).Related(&scenarios, "Scenarios").Error)
 	if len(scenarios) != 2 {
 		assert.Fail(t, "User Associations",
 			"Expected to have %v Scenarios. Has %v.", 2, len(scenarios))
@@ -98,8 +95,8 @@ func TestUserAssociations(t *testing.T) {
 
 func TestScenarioAssociations(t *testing.T) {
 
-	DropTables(db)
+	DropTables()
-	MigrateModels(db)
+	MigrateModels()
 
 	// create copies of global test data
 	scenarioA := ScenarioA
@@ -113,44 +110,44 @@ func TestScenarioAssociations(t *testing.T) {
 	dashboardB := DashboardB
 
 	// add scenarios to DB
-	assert.NoError(t, db.Create(&scenarioA).Error)
+	assert.NoError(t, DBpool.Create(&scenarioA).Error)
-	assert.NoError(t, db.Create(&scenarioB).Error)
+	assert.NoError(t, DBpool.Create(&scenarioB).Error)
 
 	// add users to DB
-	assert.NoError(t, db.Create(&user0).Error) // Admin
+	assert.NoError(t, DBpool.Create(&user0).Error) // Admin
-	assert.NoError(t, db.Create(&userA).Error) // Normal User
+	assert.NoError(t, DBpool.Create(&userA).Error) // Normal User
-	assert.NoError(t, db.Create(&userB).Error) // Normal User
+	assert.NoError(t, DBpool.Create(&userB).Error) // Normal User
 
 	// add component configurations to DB
-	assert.NoError(t, db.Create(&configA).Error)
+	assert.NoError(t, DBpool.Create(&configA).Error)
-	assert.NoError(t, db.Create(&configB).Error)
+	assert.NoError(t, DBpool.Create(&configB).Error)
 
 	// add dashboards to DB
-	assert.NoError(t, db.Create(&dashboardA).Error)
+	assert.NoError(t, DBpool.Create(&dashboardA).Error)
-	assert.NoError(t, db.Create(&dashboardB).Error)
+	assert.NoError(t, DBpool.Create(&dashboardB).Error)
 
 	// add many-to-many associations between users and scenarios
 	// User HM Scenarios, Scenario HM Users (Many-to-Many)
-	assert.NoError(t, db.Model(&scenarioA).Association("Users").Append(&userA).Error)
+	assert.NoError(t, DBpool.Model(&scenarioA).Association("Users").Append(&userA).Error)
-	assert.NoError(t, db.Model(&scenarioA).Association("Users").Append(&userB).Error)
+	assert.NoError(t, DBpool.Model(&scenarioA).Association("Users").Append(&userB).Error)
-	assert.NoError(t, db.Model(&scenarioB).Association("Users").Append(&userA).Error)
+	assert.NoError(t, DBpool.Model(&scenarioB).Association("Users").Append(&userA).Error)
-	assert.NoError(t, db.Model(&scenarioB).Association("Users").Append(&userB).Error)
+	assert.NoError(t, DBpool.Model(&scenarioB).Association("Users").Append(&userB).Error)
 
 	// add scenario has many component configurations associations
-	assert.NoError(t, db.Model(&scenarioA).Association("ComponentConfigurations").Append(&configA).Error)
+	assert.NoError(t, DBpool.Model(&scenarioA).Association("ComponentConfigurations").Append(&configA).Error)
-	assert.NoError(t, db.Model(&scenarioA).Association("ComponentConfigurations").Append(&configB).Error)
+	assert.NoError(t, DBpool.Model(&scenarioA).Association("ComponentConfigurations").Append(&configB).Error)
 
 	// Scenario HM Dashboards
-	assert.NoError(t, db.Model(&scenarioA).Association("Dashboards").Append(&dashboardA).Error)
+	assert.NoError(t, DBpool.Model(&scenarioA).Association("Dashboards").Append(&dashboardA).Error)
-	assert.NoError(t, db.Model(&scenarioA).Association("Dashboards").Append(&dashboardB).Error)
+	assert.NoError(t, DBpool.Model(&scenarioA).Association("Dashboards").Append(&dashboardB).Error)
 
 	var scenario1 Scenario
-	assert.NoError(t, db.Find(&scenario1, 1).Error, fmt.Sprintf("Find Scenario with ID=1"))
+	assert.NoError(t, DBpool.Find(&scenario1, 1).Error, fmt.Sprintf("Find Scenario with ID=1"))
 	assert.EqualValues(t, "Scenario_A", scenario1.Name)
 
 	// Get users of scenario1
 	var users []User
-	assert.NoError(t, db.Model(&scenario1).Association("Users").Find(&users).Error)
+	assert.NoError(t, DBpool.Model(&scenario1).Association("Users").Find(&users).Error)
 	if len(users) != 2 {
 		assert.Fail(t, "Scenario Associations",
 			"Expected to have %v Users. Has %v.", 2, len(users))
@@ -158,7 +155,7 @@ func TestScenarioAssociations(t *testing.T) {
 
 	// Get component configurations of scenario1
 	var configs []ComponentConfiguration
-	assert.NoError(t, db.Model(&scenario1).Related(&configs, "ComponentConfigurations").Error)
+	assert.NoError(t, DBpool.Model(&scenario1).Related(&configs, "ComponentConfigurations").Error)
 	if len(configs) != 2 {
 		assert.Fail(t, "Scenario Associations",
 			"Expected to have %v component configs. Has %v.", 2, len(configs))
@@ -166,7 +163,7 @@ func TestScenarioAssociations(t *testing.T) {
 
 	// Get dashboards of scenario1
 	var dashboards []Dashboard
-	assert.NoError(t, db.Model(&scenario1).Related(&dashboards, "Dashboards").Error)
+	assert.NoError(t, DBpool.Model(&scenario1).Related(&dashboards, "Dashboards").Error)
 	if len(dashboards) != 2 {
 		assert.Fail(t, "Scenario Associations",
 			"Expected to have %v Dashboards. Has %v.", 2, len(dashboards))
@@ -175,8 +172,8 @@ func TestScenarioAssociations(t *testing.T) {
 
 func TestICAssociations(t *testing.T) {
 
-	DropTables(db)
+	DropTables()
-	MigrateModels(db)
+	MigrateModels()
 
 	// create copies of global test data
 	icA := ICA
@@ -185,24 +182,24 @@ func TestICAssociations(t *testing.T) {
 	configB := ConfigB
 
 	// add ICs to DB
-	assert.NoError(t, db.Create(&icA).Error)
+	assert.NoError(t, DBpool.Create(&icA).Error)
-	assert.NoError(t, db.Create(&icB).Error)
+	assert.NoError(t, DBpool.Create(&icB).Error)
 
 	// add component configurations to DB
-	assert.NoError(t, db.Create(&configA).Error)
+	assert.NoError(t, DBpool.Create(&configA).Error)
-	assert.NoError(t, db.Create(&configB).Error)
+	assert.NoError(t, DBpool.Create(&configB).Error)
 
 	// add IC has many component configurations association to DB
-	assert.NoError(t, db.Model(&icA).Association("ComponentConfigurations").Append(&configA).Error)
+	assert.NoError(t, DBpool.Model(&icA).Association("ComponentConfigurations").Append(&configA).Error)
-	assert.NoError(t, db.Model(&icA).Association("ComponentConfigurations").Append(&configB).Error)
+	assert.NoError(t, DBpool.Model(&icA).Association("ComponentConfigurations").Append(&configB).Error)
 
 	var ic1 InfrastructureComponent
-	assert.NoError(t, db.Find(&ic1, 1).Error, fmt.Sprintf("Find InfrastructureComponent with ID=1"))
+	assert.NoError(t, DBpool.Find(&ic1, 1).Error, fmt.Sprintf("Find InfrastructureComponent with ID=1"))
 	assert.EqualValues(t, "Host_A", ic1.Host)
 
 	// Get Component Configurations of ic1
 	var configs []ComponentConfiguration
-	assert.NoError(t, db.Model(&ic1).Association("ComponentConfigurations").Find(&configs).Error)
+	assert.NoError(t, DBpool.Model(&ic1).Association("ComponentConfigurations").Find(&configs).Error)
 	if len(configs) != 2 {
 		assert.Fail(t, "InfrastructureComponent Associations",
 			"Expected to have %v Component Configurations. Has %v.", 2, len(configs))
@@ -211,8 +208,8 @@ func TestICAssociations(t *testing.T) {
 
 func TestComponentConfigurationAssociations(t *testing.T) {
 
-	DropTables(db)
+	DropTables()
-	MigrateModels(db)
+	MigrateModels()
 
 	// create copies of global test data
 	configA := ConfigA
@@ -229,41 +226,41 @@ func TestComponentConfigurationAssociations(t *testing.T) {
 	icB := ICB
 
 	// add Component Configurations to DB
-	assert.NoError(t, db.Create(&configA).Error)
+	assert.NoError(t, DBpool.Create(&configA).Error)
-	assert.NoError(t, db.Create(&configB).Error)
+	assert.NoError(t, DBpool.Create(&configB).Error)
 
 	// add signals to DB
-	assert.NoError(t, db.Create(&outSignalA).Error)
+	assert.NoError(t, DBpool.Create(&outSignalA).Error)
-	assert.NoError(t, db.Create(&outSignalB).Error)
+	assert.NoError(t, DBpool.Create(&outSignalB).Error)
-	assert.NoError(t, db.Create(&inSignalA).Error)
+	assert.NoError(t, DBpool.Create(&inSignalA).Error)
-	assert.NoError(t, db.Create(&inSignalB).Error)
+	assert.NoError(t, DBpool.Create(&inSignalB).Error)
 
 	// add files to DB
-	assert.NoError(t, db.Create(&fileA).Error)
+	assert.NoError(t, DBpool.Create(&fileA).Error)
-	assert.NoError(t, db.Create(&fileB).Error)
+	assert.NoError(t, DBpool.Create(&fileB).Error)
-	assert.NoError(t, db.Create(&fileC).Error)
+	assert.NoError(t, DBpool.Create(&fileC).Error)
-	assert.NoError(t, db.Create(&fileD).Error)
+	assert.NoError(t, DBpool.Create(&fileD).Error)
 
 	// add ICs to DB
-	assert.NoError(t, db.Create(&icA).Error)
+	assert.NoError(t, DBpool.Create(&icA).Error)
-	assert.NoError(t, db.Create(&icB).Error)
+	assert.NoError(t, DBpool.Create(&icB).Error)
 
 	// add Component Configuration has many signals associations
-	assert.NoError(t, db.Model(&configA).Association("InputMapping").Append(&inSignalA).Error)
+	assert.NoError(t, DBpool.Model(&configA).Association("InputMapping").Append(&inSignalA).Error)
-	assert.NoError(t, db.Model(&configA).Association("InputMapping").Append(&inSignalB).Error)
+	assert.NoError(t, DBpool.Model(&configA).Association("InputMapping").Append(&inSignalB).Error)
-	assert.NoError(t, db.Model(&configA).Association("OutputMapping").Append(&outSignalA).Error)
+	assert.NoError(t, DBpool.Model(&configA).Association("OutputMapping").Append(&outSignalA).Error)
-	assert.NoError(t, db.Model(&configA).Association("OutputMapping").Append(&outSignalB).Error)
+	assert.NoError(t, DBpool.Model(&configA).Association("OutputMapping").Append(&outSignalB).Error)
 
 	// add Component Configuration has many files associations
-	assert.NoError(t, db.Model(&configA).Association("Files").Append(&fileC).Error)
+	assert.NoError(t, DBpool.Model(&configA).Association("Files").Append(&fileC).Error)
-	assert.NoError(t, db.Model(&configA).Association("Files").Append(&fileD).Error)
+	assert.NoError(t, DBpool.Model(&configA).Association("Files").Append(&fileD).Error)
 
 	// associate Component Configurations with IC
-	assert.NoError(t, db.Model(&icA).Association("ComponentConfigurations").Append(&configA).Error)
+	assert.NoError(t, DBpool.Model(&icA).Association("ComponentConfigurations").Append(&configA).Error)
-	assert.NoError(t, db.Model(&icA).Association("ComponentConfigurations").Append(&configB).Error)
+	assert.NoError(t, DBpool.Model(&icA).Association("ComponentConfigurations").Append(&configB).Error)
 
 	var config1 ComponentConfiguration
-	assert.NoError(t, db.Find(&config1, 1).Error, fmt.Sprintf("Find ComponentConfiguration with ID=1"))
+	assert.NoError(t, DBpool.Find(&config1, 1).Error, fmt.Sprintf("Find ComponentConfiguration with ID=1"))
 	assert.EqualValues(t, ConfigA.Name, config1.Name)
 
 	// Check IC ID
@@ -273,7 +270,7 @@ func TestComponentConfigurationAssociations(t *testing.T) {
 
 	// Get OutputMapping signals of config1
 	var signals []Signal
-	assert.NoError(t, db.Model(&config1).Where("Direction = ?", "out").Related(&signals, "OutputMapping").Error)
+	assert.NoError(t, DBpool.Model(&config1).Where("Direction = ?", "out").Related(&signals, "OutputMapping").Error)
 	if len(signals) != 2 {
 		assert.Fail(t, "ComponentConfiguration Associations",
 			"Expected to have %v Output Signals. Has %v.", 2, len(signals))
@@ -281,7 +278,7 @@ func TestComponentConfigurationAssociations(t *testing.T) {
 
 	// Get files of config1
 	var files []File
-	assert.NoError(t, db.Model(&config1).Related(&files, "Files").Error)
+	assert.NoError(t, DBpool.Model(&config1).Related(&files, "Files").Error)
 	if len(files) != 2 {
 		assert.Fail(t, "ComponentConfiguration Associations",
 			"Expected to have %v Files. Has %v.", 2, len(files))
@@ -290,8 +287,8 @@ func TestComponentConfigurationAssociations(t *testing.T) {
 
 func TestDashboardAssociations(t *testing.T) {
 
-	DropTables(db)
+	DropTables()
-	MigrateModels(db)
+	MigrateModels()
 
 	// create copies of global test data
 	dashboardA := DashboardA
@@ -300,24 +297,24 @@ func TestDashboardAssociations(t *testing.T) {
 	widgetB := WidgetB
 
 	// add dashboards to DB
-	assert.NoError(t, db.Create(&dashboardA).Error)
+	assert.NoError(t, DBpool.Create(&dashboardA).Error)
-	assert.NoError(t, db.Create(&dashboardB).Error)
+	assert.NoError(t, DBpool.Create(&dashboardB).Error)
 
 	// add widgets to DB
-	assert.NoError(t, db.Create(&widgetA).Error)
+	assert.NoError(t, DBpool.Create(&widgetA).Error)
-	assert.NoError(t, db.Create(&widgetB).Error)
+	assert.NoError(t, DBpool.Create(&widgetB).Error)
 
 	// add dashboard has many widgets associations to DB
-	assert.NoError(t, db.Model(&dashboardA).Association("Widgets").Append(&widgetA).Error)
+	assert.NoError(t, DBpool.Model(&dashboardA).Association("Widgets").Append(&widgetA).Error)
-	assert.NoError(t, db.Model(&dashboardA).Association("Widgets").Append(&widgetB).Error)
+	assert.NoError(t, DBpool.Model(&dashboardA).Association("Widgets").Append(&widgetB).Error)
 
 	var dashboard1 Dashboard
-	assert.NoError(t, db.Find(&dashboard1, 1).Error, fmt.Sprintf("Find Dashboard with ID=1"))
+	assert.NoError(t, DBpool.Find(&dashboard1, 1).Error, fmt.Sprintf("Find Dashboard with ID=1"))
 	assert.EqualValues(t, "Dashboard_A", dashboard1.Name)
 
 	//Get widgets of dashboard1
 	var widgets []Widget
-	assert.NoError(t, db.Model(&dashboard1).Related(&widgets, "Widgets").Error)
+	assert.NoError(t, DBpool.Model(&dashboard1).Related(&widgets, "Widgets").Error)
 	if len(widgets) != 2 {
 		assert.Fail(t, "Dashboard Associations",
 			"Expected to have %v Widget. Has %v.", 2, len(widgets))
@@ -326,8 +323,8 @@ func TestDashboardAssociations(t *testing.T) {
 
 func TestWidgetAssociations(t *testing.T) {
 
-	DropTables(db)
+	DropTables()
-	MigrateModels(db)
+	MigrateModels()
 
 	// create copies of global test data
 	widgetA := WidgetA
@@ -338,26 +335,26 @@ func TestWidgetAssociations(t *testing.T) {
 	fileD := FileD
 
 	// add widgets to DB
-	assert.NoError(t, db.Create(&widgetA).Error)
+	assert.NoError(t, DBpool.Create(&widgetA).Error)
-	assert.NoError(t, db.Create(&widgetB).Error)
+	assert.NoError(t, DBpool.Create(&widgetB).Error)
 
 	// add files to DB
-	assert.NoError(t, db.Create(&fileA).Error)
+	assert.NoError(t, DBpool.Create(&fileA).Error)
-	assert.NoError(t, db.Create(&fileB).Error)
+	assert.NoError(t, DBpool.Create(&fileB).Error)
-	assert.NoError(t, db.Create(&fileC).Error)
+	assert.NoError(t, DBpool.Create(&fileC).Error)
-	assert.NoError(t, db.Create(&fileD).Error)
+	assert.NoError(t, DBpool.Create(&fileD).Error)
 
 	// add widget has many files associations to DB
-	assert.NoError(t, db.Model(&widgetA).Association("Files").Append(&fileA).Error)
+	assert.NoError(t, DBpool.Model(&widgetA).Association("Files").Append(&fileA).Error)
-	assert.NoError(t, db.Model(&widgetA).Association("Files").Append(&fileB).Error)
+	assert.NoError(t, DBpool.Model(&widgetA).Association("Files").Append(&fileB).Error)
 
 	var widget1 Widget
-	assert.NoError(t, db.Find(&widget1, 1).Error, fmt.Sprintf("Find Widget with ID=1"))
+	assert.NoError(t, DBpool.Find(&widget1, 1).Error, fmt.Sprintf("Find Widget with ID=1"))
 	assert.EqualValues(t, widgetA.Name, widget1.Name)
 
 	// Get files of widget
 	var files []File
-	assert.NoError(t, db.Model(&widget1).Related(&files, "Files").Error)
+	assert.NoError(t, DBpool.Model(&widget1).Related(&files, "Files").Error)
 	if len(files) != 2 {
 		assert.Fail(t, "Widget Associations",
 			"Expected to have %v Files. Has %v.", 2, len(files))
@@ -366,8 +363,8 @@ func TestWidgetAssociations(t *testing.T) {
 
 func TestFileAssociations(t *testing.T) {
 
-	DropTables(db)
+	DropTables()
-	MigrateModels(db)
+	MigrateModels()
 
 	// create copies of global test data
 	fileA := FileA
@@ -376,26 +373,26 @@ func TestFileAssociations(t *testing.T) {
 	fileD := FileD
 
 	// add files to DB
-	assert.NoError(t, db.Create(&fileA).Error)
+	assert.NoError(t, DBpool.Create(&fileA).Error)
-	assert.NoError(t, db.Create(&fileB).Error)
+	assert.NoError(t, DBpool.Create(&fileB).Error)
-	assert.NoError(t, db.Create(&fileC).Error)
+	assert.NoError(t, DBpool.Create(&fileC).Error)
-	assert.NoError(t, db.Create(&fileD).Error)
+	assert.NoError(t, DBpool.Create(&fileD).Error)
 
 	var file1 File
-	assert.NoError(t, db.Find(&file1, 1).Error, fmt.Sprintf("Find File with ID=1"))
+	assert.NoError(t, DBpool.Find(&file1, 1).Error, fmt.Sprintf("Find File with ID=1"))
 	assert.EqualValues(t, "File_A", file1.Name)
 }
 
 func TestAddAdmin(t *testing.T) {
-	DropTables(db)
+	DropTables()
-	MigrateModels(db)
+	MigrateModels()
 
-	assert.NoError(t, DBAddAdminUser(db))
+	assert.NoError(t, DBAddAdminUser())
 }
 
 func TestAddAdminAndUsers(t *testing.T) {
-	DropTables(db)
+	DropTables()
-	MigrateModels(db)
+	MigrateModels()
 
-	assert.NoError(t, DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, DBAddAdminAndUserAndGuest())
 }

database/testdata.go

@@ -27,7 +27,6 @@ import (
 	"fmt"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/helper"
 	"github.com/gin-gonic/gin"
-	"github.com/jinzhu/gorm"
 	"github.com/jinzhu/gorm/dialects/postgres"
 	"golang.org/x/crypto/bcrypt"
 	"io"
@@ -306,26 +305,26 @@ var WidgetE = Widget{
 	SignalIDs:        []int64{4},
 }
 
-func DBAddAdminUser(db *gorm.DB) error {
+func DBAddAdminUser() error {
-	db.AutoMigrate(&User{})
+	DBpool.AutoMigrate(&User{})
 
 	// Check if admin user exists in DB
 	var users []User
-	err := db.Where("Role = ?", "Admin").Find(&users).Error
+	err := DBpool.Where("Role = ?", "Admin").Find(&users).Error
 
 	if len(users) == 0 {
 		fmt.Println("No admin user found in DB, adding default admin user.")
 		//create a copy of global test data
 		user0 := User0
 		// add admin user to DB
-		err = db.Create(&user0).Error
+		err = DBpool.Create(&user0).Error
 	}
 
 	return err
 }
 
-func DBAddAdminAndUserAndGuest(db *gorm.DB) error {
+func DBAddAdminAndUserAndGuest() error {
-	db.AutoMigrate(&User{})
+	DBpool.AutoMigrate(&User{})
 
 	//create a copy of global test data
 	user0 := User0
@@ -334,22 +333,22 @@ func DBAddAdminAndUserAndGuest(db *gorm.DB) error {
 	userC := UserC
 
 	// add admin user to DB
-	err := db.Create(&user0).Error
+	err := DBpool.Create(&user0).Error
 	// add normal users to DB
-	err = db.Create(&userA).Error
+	err = DBpool.Create(&userA).Error
-	err = db.Create(&userB).Error
+	err = DBpool.Create(&userB).Error
 	// add guest user to DB
-	err = db.Create(&userC).Error
+	err = DBpool.Create(&userC).Error
 	return err
 }
 
 // Populates DB with test data
-func DBAddTestData(db *gorm.DB, basePath string, router *gin.Engine) error {
+func DBAddTestData(basePath string, router *gin.Engine) error {
 
-	MigrateModels(db)
+	MigrateModels()
 	// Create entries of each model (data defined in testdata.go)
 	// add Admin user
-	err := DBAddAdminUser(db)
+	err := DBAddAdminUser()
 	if err != nil {
 		return err
 	}

routes/component-configuration/config_test.go

@@ -30,7 +30,6 @@ import (
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/scenario"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/user"
 	"github.com/gin-gonic/gin"
-	"github.com/jinzhu/gorm"
 	"github.com/jinzhu/gorm/dialects/postgres"
 	"github.com/stretchr/testify/assert"
 	"os"
@@ -38,7 +37,6 @@ import (
 )
 
 var router *gin.Engine
-var db *gorm.DB
 var base_api_configs = "/api/configs"
 var base_api_auth = "/api/authenticate"
 
@@ -124,11 +122,11 @@ func TestMain(m *testing.M) {
 		panic(m)
 	}
 
-	db, err = database.InitDB(configuration.GolbalConfig)
+	err = database.InitDB(configuration.GolbalConfig)
 	if err != nil {
 		panic(m)
 	}
-	defer db.Close()
+	defer database.DBpool.Close()
 
 	router = gin.Default()
 	api := router.Group("/api")
@@ -147,9 +145,9 @@ func TestMain(m *testing.M) {
 }
 
 func TestAddConfig(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// prepare the content of the DB for testing
 	// by adding a scenario and a IC to the DB
@@ -243,9 +241,9 @@ func TestAddConfig(t *testing.T) {
 
 func TestUpdateConfig(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// prepare the content of the DB for testing
 	// by adding a scenario and a IC to the DB
@@ -355,9 +353,9 @@ func TestUpdateConfig(t *testing.T) {
 }
 
 func TestDeleteConfig(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// prepare the content of the DB for testing
 	// by adding a scenario and a IC to the DB
@@ -428,9 +426,9 @@ func TestDeleteConfig(t *testing.T) {
 }
 
 func TestGetAllConfigsOfScenario(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// prepare the content of the DB for testing
 	// by adding a scenario and a IC to the DB

routes/dashboard/dashboard_test.go

@@ -29,7 +29,6 @@ import (
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/scenario"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/user"
 	"github.com/gin-gonic/gin"
-	"github.com/jinzhu/gorm"
 	"github.com/jinzhu/gorm/dialects/postgres"
 	"github.com/stretchr/testify/assert"
 	"log"
@@ -38,7 +37,6 @@ import (
 )
 
 var router *gin.Engine
-var db *gorm.DB
 
 type DashboardRequest struct {
 	Name       string `json:"name,omitempty"`
@@ -81,11 +79,11 @@ func TestMain(m *testing.M) {
 	if err != nil {
 		panic(m)
 	}
-	db, err = database.InitDB(configuration.GolbalConfig)
+	err = database.InitDB(configuration.GolbalConfig)
 	if err != nil {
 		panic(m)
 	}
-	defer db.Close()
+	defer database.DBpool.Close()
 
 	router = gin.Default()
 	api := router.Group("/api")
@@ -101,9 +99,9 @@ func TestMain(m *testing.M) {
 }
 
 func TestAddDashboard(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as normal user
 	token, err := helper.AuthenticateForTest(router,
@@ -187,9 +185,9 @@ func TestAddDashboard(t *testing.T) {
 }
 
 func TestUpdateDashboard(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as normal user
 	token, err := helper.AuthenticateForTest(router,
@@ -268,9 +266,9 @@ func TestUpdateDashboard(t *testing.T) {
 }
 
 func TestDeleteDashboard(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as normal user
 	token, err := helper.AuthenticateForTest(router,
@@ -341,9 +339,9 @@ func TestDeleteDashboard(t *testing.T) {
 }
 
 func TestGetAllDashboardsOfScenario(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as normal user
 	token, err := helper.AuthenticateForTest(router,

routes/file/file_test.go

@@ -34,7 +34,6 @@ import (
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/user"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/widget"
 	"github.com/gin-gonic/gin"
-	"github.com/jinzhu/gorm"
 	"github.com/jinzhu/gorm/dialects/postgres"
 	"github.com/stretchr/testify/assert"
 	"io"
@@ -47,7 +46,6 @@ import (
 )
 
 var router *gin.Engine
-var db *gorm.DB
 
 type ConfigRequest struct {
 	Name            string         `json:"name,omitempty"`
@@ -185,11 +183,11 @@ func TestMain(m *testing.M) {
 	if err != nil {
 		panic(m)
 	}
-	db, err = database.InitDB(configuration.GolbalConfig)
+	err = database.InitDB(configuration.GolbalConfig)
 	if err != nil {
 		panic(m)
 	}
-	defer db.Close()
+	defer database.DBpool.Close()
 
 	router = gin.Default()
 	api := router.Group("/api")
@@ -218,9 +216,9 @@ func TestMain(m *testing.M) {
 }
 
 func TestAddFile(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// prepare the content of the DB for testing
 	// using the respective endpoints of the API
@@ -334,9 +332,9 @@ func TestAddFile(t *testing.T) {
 
 func TestUpdateFile(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// prepare the content of the DB for testing
 	// using the respective endpoints of the API
@@ -468,9 +466,9 @@ func TestUpdateFile(t *testing.T) {
 }
 
 func TestDeleteFile(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// prepare the content of the DB for testing
 	// using the respective endpoints of the API
@@ -619,9 +617,9 @@ func TestDeleteFile(t *testing.T) {
 
 func TestGetAllFilesOfConfig(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// prepare the content of the DB for testing
 	// using the respective endpoints of the API

routes/healthz/healthz_test.go

@@ -27,7 +27,6 @@ import (
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/database"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/helper"
 	"github.com/gin-gonic/gin"
-	"github.com/jinzhu/gorm"
 	"github.com/stretchr/testify/assert"
 	"net/http"
 
@@ -35,23 +34,22 @@ import (
 )
 
 var router *gin.Engine
-var db *gorm.DB
 
 func TestHealthz(t *testing.T) {
 	err := configuration.InitConfig()
 	assert.NoError(t, err)
 
 	// connect DB
-	db, err = database.InitDB(configuration.GolbalConfig)
+	err = database.InitDB(configuration.GolbalConfig)
 	assert.NoError(t, err)
-	defer db.Close()
+	defer database.DBpool.Close()
 
 	router = gin.Default()
 
 	RegisterHealthzEndpoint(router.Group("/healthz"))
 
 	// close db connection
-	err = db.Close()
+	err = database.DBpool.Close()
 	assert.NoError(t, err)
 
 	// test healthz endpoint for unconnected DB and AMQP client
@@ -60,9 +58,9 @@ func TestHealthz(t *testing.T) {
 	assert.Equalf(t, 500, code, "Response body: \n%v\n", resp)
 
 	// reconnect DB
-	db, err = database.InitDB(configuration.GolbalConfig)
+	err = database.InitDB(configuration.GolbalConfig)
 	assert.NoError(t, err)
-	defer db.Close()
+	defer database.DBpool.Close()
 
 	// test healthz endpoint for connected DB and unconnected AMQP client
 	code, resp, err = helper.TestEndpoint(router, "", "healthz", http.MethodGet, nil)

routes/infrastructure-component/ic_test.go

@@ -24,7 +24,6 @@ package infrastructure_component
 import (
 	"fmt"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/helper"
-	"github.com/jinzhu/gorm"
 	"github.com/jinzhu/gorm/dialects/postgres"
 	"github.com/stretchr/testify/assert"
 	"os"
@@ -38,7 +37,6 @@ import (
 )
 
 var router *gin.Engine
-var db *gorm.DB
 
 type ICRequest struct {
 	UUID       string         `json:"uuid,omitempty"`
@@ -54,11 +52,11 @@ func TestMain(m *testing.M) {
 		panic(m)
 	}
 
-	db, err = database.InitDB(configuration.GolbalConfig)
+	err = database.InitDB(configuration.GolbalConfig)
 	if err != nil {
 		panic(m)
 	}
-	defer db.Close()
+	defer database.DBpool.Close()
 
 	router = gin.Default()
 	api := router.Group("/api")
@@ -71,9 +69,9 @@ func TestMain(m *testing.M) {
 }
 
 func TestAddICAsAdmin(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as admin
 	token, err := helper.AuthenticateForTest(router,
@@ -138,9 +136,9 @@ func TestAddICAsAdmin(t *testing.T) {
 }
 
 func TestAddICAsUser(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as user
 	token, err := helper.AuthenticateForTest(router,
@@ -165,9 +163,9 @@ func TestAddICAsUser(t *testing.T) {
 }
 
 func TestUpdateICAsAdmin(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as admin
 	token, err := helper.AuthenticateForTest(router,
@@ -227,9 +225,9 @@ func TestUpdateICAsAdmin(t *testing.T) {
 }
 
 func TestUpdateICAsUser(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as admin
 	token, err := helper.AuthenticateForTest(router,
@@ -269,9 +267,9 @@ func TestUpdateICAsUser(t *testing.T) {
 }
 
 func TestDeleteICAsAdmin(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as admin
 	token, err := helper.AuthenticateForTest(router,
@@ -319,9 +317,9 @@ func TestDeleteICAsAdmin(t *testing.T) {
 }
 
 func TestDeleteICAsUser(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as admin
 	token, err := helper.AuthenticateForTest(router,
@@ -360,9 +358,9 @@ func TestDeleteICAsUser(t *testing.T) {
 }
 
 func TestGetAllICs(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as admin
 	token, err := helper.AuthenticateForTest(router,
@@ -421,9 +419,9 @@ func TestGetAllICs(t *testing.T) {
 }
 
 func TestGetConfigsOfIC(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as admin
 	token, err := helper.AuthenticateForTest(router,

routes/metrics/metrics_endpoint.go

@@ -22,9 +22,9 @@
 package metrics
 
 import (
+	"git.rwth-aachen.de/acs/public/villas/web-backend-go/database"
 	"github.com/chenjiandongx/ginprom"
 	"github.com/gin-gonic/gin"
-	"github.com/jinzhu/gorm"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
@@ -111,9 +111,11 @@ func RegisterMetricsEndpoint(rg *gin.RouterGroup) {
 	)
 }
 
-func InitCounters(db *gorm.DB) {
+func InitCounters() {
 	var infrastructure_components, component_configurations, files, scenarios, users, dashboards float64
 
+	db := database.GetDB()
+
 	db.Table("infrastructure_components").Count(&infrastructure_components)
 	db.Table("component_configurations").Count(&component_configurations)
 	db.Table("files").Count(&files)

routes/scenario/scenario_test.go

@@ -28,7 +28,6 @@ import (
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/helper"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/user"
 	"github.com/gin-gonic/gin"
-	"github.com/jinzhu/gorm"
 	"github.com/jinzhu/gorm/dialects/postgres"
 	"github.com/stretchr/testify/assert"
 	"os"
@@ -36,7 +35,6 @@ import (
 )
 
 var router *gin.Engine
-var db *gorm.DB
 
 type ScenarioRequest struct {
 	Name            string         `json:"name,omitempty"`
@@ -58,11 +56,11 @@ func TestMain(m *testing.M) {
 		panic(m)
 	}
 
-	db, err = database.InitDB(configuration.GolbalConfig)
+	err = database.InitDB(configuration.GolbalConfig)
 	if err != nil {
 		panic(m)
 	}
-	defer db.Close()
+	defer database.DBpool.Close()
 
 	router = gin.Default()
 	api := router.Group("/api")
@@ -79,9 +77,9 @@ func TestMain(m *testing.M) {
 
 func TestAddScenario(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	newScenario := ScenarioRequest{
 		Name:            database.ScenarioA.Name,
@@ -181,9 +179,9 @@ func TestAddScenario(t *testing.T) {
 
 func TestUpdateScenario(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as normal user
 	token, err := helper.AuthenticateForTest(router,
@@ -251,9 +249,9 @@ func TestUpdateScenario(t *testing.T) {
 
 func TestGetAllScenariosAsAdmin(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as admin
 	token, err := helper.AuthenticateForTest(router,
@@ -312,9 +310,9 @@ func TestGetAllScenariosAsAdmin(t *testing.T) {
 
 func TestGetAllScenariosAsUser(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as normal userB
 	token, err := helper.AuthenticateForTest(router,
@@ -369,9 +367,9 @@ func TestGetAllScenariosAsUser(t *testing.T) {
 
 func TestDeleteScenario(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as normal user
 	token, err := helper.AuthenticateForTest(router,
@@ -441,9 +439,9 @@ func TestDeleteScenario(t *testing.T) {
 
 func TestAddUserToScenario(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as normal user
 	token, err := helper.AuthenticateForTest(router,
@@ -521,9 +519,9 @@ func TestAddUserToScenario(t *testing.T) {
 
 func TestGetAllUsersOfScenario(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as normal user
 	token, err := helper.AuthenticateForTest(router,
@@ -606,9 +604,9 @@ func TestGetAllUsersOfScenario(t *testing.T) {
 
 func TestRemoveUserFromScenario(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as normal user
 	token, err := helper.AuthenticateForTest(router,

routes/signal/signal_test.go

@@ -31,7 +31,6 @@ import (
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/scenario"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/user"
 	"github.com/gin-gonic/gin"
-	"github.com/jinzhu/gorm"
 	"github.com/jinzhu/gorm/dialects/postgres"
 	"github.com/stretchr/testify/assert"
 	"os"
@@ -39,7 +38,6 @@ import (
 )
 
 var router *gin.Engine
-var db *gorm.DB
 
 type SignalRequest struct {
 	Name      string `json:"name,omitempty"`
@@ -132,11 +130,11 @@ func TestMain(m *testing.M) {
 		panic(m)
 	}
 
-	db, err = database.InitDB(configuration.GolbalConfig)
+	err = database.InitDB(configuration.GolbalConfig)
 	if err != nil {
 		panic(m)
 	}
-	defer db.Close()
+	defer database.DBpool.Close()
 
 	router = gin.Default()
 	api := router.Group("/api")
@@ -158,9 +156,9 @@ func TestMain(m *testing.M) {
 }
 
 func TestAddSignal(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// prepare the content of the DB for testing
 	// by adding a scenario and a IC to the DB
@@ -253,9 +251,9 @@ func TestAddSignal(t *testing.T) {
 }
 
 func TestUpdateSignal(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// prepare the content of the DB for testing
 	// by adding a scenario and a IC to the DB
@@ -355,9 +353,9 @@ func TestUpdateSignal(t *testing.T) {
 }
 
 func TestDeleteSignal(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// prepare the content of the DB for testing
 	// by adding a scenario and a IC to the DB
@@ -450,9 +448,9 @@ func TestDeleteSignal(t *testing.T) {
 }
 
 func TestGetAllInputSignalsOfConfig(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// prepare the content of the DB for testing
 	// by adding a scenario and a IC to the DB

routes/user/user_test.go

@@ -32,7 +32,6 @@ import (
 	"testing"
 
 	"github.com/gin-gonic/gin"
-	"github.com/jinzhu/gorm"
 	"github.com/stretchr/testify/assert"
 
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/configuration"
@@ -40,7 +39,6 @@ import (
 )
 
 var router *gin.Engine
-var db *gorm.DB
 
 type UserRequest struct {
 	Username    string `json:"username,omitempty"`
@@ -57,11 +55,11 @@ func TestMain(m *testing.M) {
 		panic(m)
 	}
 
-	db, err = database.InitDB(configuration.GolbalConfig)
+	err = database.InitDB(configuration.GolbalConfig)
 	if err != nil {
 		panic(m)
 	}
-	defer db.Close()
+	defer database.DBpool.Close()
 
 	router = gin.Default()
 	api := router.Group("/api")
@@ -74,9 +72,9 @@ func TestMain(m *testing.M) {
 }
 
 func TestAuthenticate(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// try to authenticate with non JSON body
 	// should result in unauthorized
@@ -134,9 +132,9 @@ func TestAuthenticate(t *testing.T) {
 
 func TestAddGetUser(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as admin
 	token, err := helper.AuthenticateForTest(router,
@@ -258,9 +256,9 @@ func TestAddGetUser(t *testing.T) {
 
 func TestUsersNotAllowedActions(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as admin
 	token, err := helper.AuthenticateForTest(router,
@@ -318,9 +316,9 @@ func TestUsersNotAllowedActions(t *testing.T) {
 
 func TestGetAllUsers(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as admin
 	token, err := helper.AuthenticateForTest(router,
@@ -367,9 +365,9 @@ func TestGetAllUsers(t *testing.T) {
 
 func TestModifyAddedUserAsUser(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as admin
 	token, err := helper.AuthenticateForTest(router,
@@ -524,9 +522,9 @@ func TestModifyAddedUserAsUser(t *testing.T) {
 
 func TestInvalidUserUpdate(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as admin
 	token, err := helper.AuthenticateForTest(router,
@@ -597,9 +595,9 @@ func TestInvalidUserUpdate(t *testing.T) {
 
 func TestModifyAddedUserAsAdmin(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as admin
 	token, err := helper.AuthenticateForTest(router,
@@ -716,9 +714,9 @@ func TestModifyAddedUserAsAdmin(t *testing.T) {
 
 func TestDeleteUser(t *testing.T) {
 
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as admin
 	token, err := helper.AuthenticateForTest(router,

routes/widget/widget_test.go

@@ -30,7 +30,6 @@ import (
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/scenario"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/user"
 	"github.com/gin-gonic/gin"
-	"github.com/jinzhu/gorm"
 	"github.com/jinzhu/gorm/dialects/postgres"
 	"github.com/stretchr/testify/assert"
 	"os"
@@ -38,7 +37,6 @@ import (
 )
 
 var router *gin.Engine
-var db *gorm.DB
 
 type WidgetRequest struct {
 	Name             string         `json:"name,omitempty"`
@@ -107,11 +105,11 @@ func TestMain(m *testing.M) {
 		panic(m)
 	}
 
-	db, err = database.InitDB(configuration.GolbalConfig)
+	err = database.InitDB(configuration.GolbalConfig)
 	if err != nil {
 		panic(m)
 	}
-	defer db.Close()
+	defer database.DBpool.Close()
 
 	router = gin.Default()
 	api := router.Group("/api")
@@ -130,9 +128,9 @@ func TestMain(m *testing.M) {
 }
 
 func TestAddWidget(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as normal user
 	token, err := helper.AuthenticateForTest(router,
@@ -230,9 +228,9 @@ func TestAddWidget(t *testing.T) {
 }
 
 func TestUpdateWidget(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as normal user
 	token, err := helper.AuthenticateForTest(router,
@@ -342,9 +340,9 @@ func TestUpdateWidget(t *testing.T) {
 }
 
 func TestDeleteWidget(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as normal user
 	token, err := helper.AuthenticateForTest(router,
@@ -419,9 +417,9 @@ func TestDeleteWidget(t *testing.T) {
 }
 
 func TestGetAllWidgetsOfDashboard(t *testing.T) {
-	database.DropTables(db)
+	database.DropTables()
-	database.MigrateModels(db)
+	database.MigrateModels()
-	assert.NoError(t, database.DBAddAdminAndUserAndGuest(db))
+	assert.NoError(t, database.DBAddAdminAndUserAndGuest())
 
 	// authenticate as normal user
 	token, err := helper.AuthenticateForTest(router,

start.go

@@ -23,88 +23,80 @@ package main
 
 import (
 	"fmt"
-	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/healthz"
+	component_configuration "git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/component-configuration"
-	"log"
-	"time"
-
-	"git.rwth-aachen.de/acs/public/villas/web-backend-go/amqp"
-	"github.com/gin-gonic/gin"
-	ginSwagger "github.com/swaggo/gin-swagger"
-	"github.com/swaggo/gin-swagger/swaggerFiles"
-
-	"git.rwth-aachen.de/acs/public/villas/web-backend-go/configuration"
-	"git.rwth-aachen.de/acs/public/villas/web-backend-go/database"
-	apidocs "git.rwth-aachen.de/acs/public/villas/web-backend-go/doc/api" // doc/api folder is used by Swag CLI, you have to import it
-	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/component-configuration"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/dashboard"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/file"
-	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/infrastructure-component"
+	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/healthz"
-	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/metrics"
+	infrastructure_component "git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/infrastructure-component"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/scenario"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/signal"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/user"
 	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/widget"
+	ginSwagger "github.com/swaggo/gin-swagger"
+	"github.com/swaggo/gin-swagger/swaggerFiles"
+	"log"
+	"time"
+
+	"git.rwth-aachen.de/acs/public/villas/web-backend-go/amqp"
+	"git.rwth-aachen.de/acs/public/villas/web-backend-go/configuration"
+	"git.rwth-aachen.de/acs/public/villas/web-backend-go/database"
+	apidocs "git.rwth-aachen.de/acs/public/villas/web-backend-go/doc/api" // doc/api folder is used by Swag CLI, you have to import it
+	"git.rwth-aachen.de/acs/public/villas/web-backend-go/routes/metrics"
+	"github.com/gin-gonic/gin"
 )
 
-// @title VILLASweb Backend API
+func configureBackend() (string, string, string, string, string, error) {
-// @version 2.0
-// @description This is the VILLASweb Backend API v2.0.
-// @description Parts of this API are still in development. Please check the [VILLASweb-backend-go repository](https://git.rwth-aachen.de/acs/public/villas/web-backend-go) for more information.
-// @description This documentation is auto-generated based on the API documentation in the code. The tool [swag](https://github.com/swaggo/swag) is used to auto-generate API docs for the [gin-gonic](https://github.com/gin-gonic/gin) framework.
-// @contact.name Sonja Happ
-// @contact.email sonja.happ@eonerc.rwth-aachen.de
-// @license.name GNU GPL 3.0
-// @license.url http://www.gnu.de/documents/gpl-3.0.en.html
-// @BasePath /api/v2
-func main() {
-	log.Println("Starting VILLASweb-backend-go")
 
 	err := configuration.InitConfig()
 	if err != nil {
 		log.Printf("Error during initialization of global configuration: %v, aborting.", err.Error())
-		return
+		return "", "", "", "", "", err
 	}
-	db, err := database.InitDB(configuration.GolbalConfig)
+
+	err = database.InitDB(configuration.GolbalConfig)
 	if err != nil {
 		log.Printf("Error during initialization of database: %v, aborting.", err.Error())
-		return
+		return "", "", "", "", "", err
 	}
-	defer db.Close()
 
-	m, err := configuration.GolbalConfig.String("mode")
+	mode, err := configuration.GolbalConfig.String("mode")
 	if err != nil {
 		log.Printf("Error reading mode from global configuration: %v, aborting.", err.Error())
-		return
+		return "", "", "", "", "", err
 	}
 
-	if m == "release" {
+	if mode == "release" {
 		gin.SetMode(gin.ReleaseMode)
 	}
 
 	baseHost, err := configuration.GolbalConfig.String("base.host")
 	if err != nil {
 		log.Printf("Error reading base.host from global configuration: %v, aborting.", err.Error())
-		return
+		return "", "", "", "", "", err
 	}
 	basePath, err := configuration.GolbalConfig.String("base.path")
 	if err != nil {
 		log.Printf("Error reading base.path from global configuration: %v, aborting.", err.Error())
-		return
+		return "", "", "", "", "", err
 	}
 	port, err := configuration.GolbalConfig.String("port")
 	if err != nil {
 		log.Printf("Error reading port from global configuration: %v, aborting.", err.Error())
-		return
+		return "", "", "", "", "", err
 	}
 
 	apidocs.SwaggerInfo.Host = baseHost
 	apidocs.SwaggerInfo.BasePath = basePath
 
-	metrics.InitCounters(db)
+	metrics.InitCounters()
 
-	r := gin.Default()
+	AMQPurl, _ := configuration.GolbalConfig.String("amqp.url")
 
-	api := r.Group(basePath)
+	return mode, baseHost, basePath, port, AMQPurl, nil
+
+}
+
+func registerEndpoints(router *gin.Engine, api *gin.RouterGroup) {
 
 	healthz.RegisterHealthzEndpoint(api.Group("/healthz"))
 	metrics.RegisterMetricsEndpoint(api.Group("/metrics"))
@@ -123,43 +115,42 @@ func main() {
 	user.RegisterUserEndpoints(api.Group("/users"))
 	infrastructure_component.RegisterICEndpoints(api.Group("/ic"))
 
-	r.GET("swagger/*any", ginSwagger.WrapHandler(swaggerFiles.Handler))
+	router.GET("swagger/*any", ginSwagger.WrapHandler(swaggerFiles.Handler))
+
+}
+
+func addData(router *gin.Engine, mode string, basePath string) error {
 
-	// add test data to DB if test mode is activated
-	mode, err := configuration.GolbalConfig.String("mode")
-	if err != nil {
-		fmt.Println(err.Error())
-		fmt.Println("error: mode parameter missing in global configuration, aborting")
-		return
-	}
 	if mode == "test" {
 		// test mode: drop all tables and add test data to DB
-		database.DropTables(db)
+		database.DropTables()
 		log.Println("Database tables dropped, adding test data to DB")
-		err = database.DBAddTestData(db, basePath, r)
+		err := database.DBAddTestData(basePath, router)
 		if err != nil {
 			fmt.Println(err.Error())
 			fmt.Println("error: testdata could not be added to DB, aborting")
-			panic(err)
+			return err
 		}
 		log.Println("Database initialized with test data")
 	} else {
 		// release mode: make sure that at least one admin user exists in DB
-		err = database.DBAddAdminUser(db)
+		err := database.DBAddAdminUser()
 		if err != nil {
 			fmt.Println(err.Error())
 			fmt.Println("error: adding admin user failed, aborting")
-			panic(err)
+			return err
 		}
 	}
+	return nil
+}
 
-	amqpurl, _ := configuration.GolbalConfig.String("amqp.url")
+func connectAMQP(AMQPurl string, api *gin.RouterGroup) error {
-	if amqpurl != "" {
+	if AMQPurl != "" {
 		log.Println("Starting AMQP client")
 
-		err := amqp.ConnectAMQP(amqpurl)
+		err := amqp.ConnectAMQP(AMQPurl)
 		if err != nil {
-			log.Panic(err)
+			return err
 		}
 
 		// register IC action endpoint only if AMQP client is used
@@ -181,8 +172,45 @@ func main() {
 
 		}()
 
-		log.Printf("Connected AMQP client to %s", amqpurl)
+		log.Printf("Connected AMQP client to %s", AMQPurl)
 	}
+
+	return nil
+}
+
+// @title VILLASweb Backend API
+// @version 2.0
+// @description This is the VILLASweb Backend API v2.0.
+// @description Parts of this API are still in development. Please check the [VILLASweb-backend-go repository](https://git.rwth-aachen.de/acs/public/villas/web-backend-go) for more information.
+// @description This documentation is auto-generated based on the API documentation in the code. The tool [swag](https://github.com/swaggo/swag) is used to auto-generate API docs for the [gin-gonic](https://github.com/gin-gonic/gin) framework.
+// @contact.name Sonja Happ
+// @contact.email sonja.happ@eonerc.rwth-aachen.de
+// @license.name GNU GPL 3.0
+// @license.url http://www.gnu.de/documents/gpl-3.0.en.html
+// @BasePath /api/v2
+func main() {
+	log.Println("Starting VILLASweb-backend-go")
+
+	mode, _, basePath, port, amqpurl, err := configureBackend()
+	if err != nil {
+		panic(err)
+	}
+	defer database.DBpool.Close()
+
+	r := gin.Default()
+	api := r.Group(basePath)
+	registerEndpoints(r, api)
+
+	err = addData(r, mode, basePath)
+	if err != nil {
+		panic(err)
+	}
+
+	err = connectAMQP(amqpurl, api)
+	if err != nil {
+		panic(err)
+	}
+
 	// server at port 4000 to match frontend's redirect path
 	r.Run(":" + port)
 }