controller.go

package nucleus

import (
	"github.com/google/uuid"
	"os"

	"code.fbi.h-da.de/cocsn/gosdn/database"
	log "github.com/sirupsen/logrus"
	"github.com/spf13/viper"
)

// Core is the representation of the controllers core
type Core struct {
	// deprecated
	database database.Database

	pndc      pndStore
	sbic      sbiStore
	IsRunning chan bool
}

//Initialize does start-up housekeeping like reading controller config files
func (c *Core) Initialize(IsRunningChannel chan bool) error {
	c.sbic = sbiStore{
		store{},
	}
	c.pndc = pndStore{
		store{},
	}

	// Set config defaults
	viper.SetDefault("socket", ":55055")

	// Set config path and read config
	viper.SetConfigName("gosdn")
	viper.SetConfigType("toml")
	viper.AddConfigPath("/usr/local/etc/gosdn/")
	viper.AddConfigPath("./configs/")
	err := viper.ReadInConfig()
	if err != nil {
		return err
	}
	c.AttachDatabase()
	if err := c.CreateSouthboundInterfaces(); err != nil {
		return err
	}

	c.IsRunning = IsRunningChannel
	return nil
}

// deprecated
// AttachDatabase connects to the database and passes the connection to the controller core
func (c *Core) AttachDatabase() {
	c.database = database.NewDatabaseClient()
}

// CreateSouthboundInterfaces initializes the controller with its supported SBIs
func (c *Core) CreateSouthboundInterfaces() error {
	if err := c.sbic.add(&OpenConfig{id: uuid.New()}); err != nil {
		return err
	}
	if err := c.sbic.add(&OpenConfig{id: uuid.New()}); err != nil {
		return err
	}
	return nil
}

// Shutdown waits for the shutdown signal and gracefully shuts down once it arrived
func (c *Core) Shutdown() {
	<-c.IsRunning
	log.Info("Received shutdown signal. Shutting down")

	err := viper.WriteConfig()
	if err != nil {
		log.Fatal(err)
	}
	log.Info("Shutdown complete")
	os.Exit(0)
}