WilliesSchematicsWorld/schematic-service-go/config/loader.go

package config

import (
	"fmt"
	"io/ioutil"
	"log"
	"os"

	"gopkg.in/yaml.v3"
)

var config = Config{
	Port:       8080,
	Sslport:    8443,
	ServiceURL: "http://127.0.0.1",
	SystemID:   "schematic-service",
	HealthCheck: HealthCheck{
		Period: 30,
	},
}

// File the config file
var File = "config/service.yaml"

// Get returns loaded config
func Get() Config {
	return config
}

// Load loads the config
func Load() error {
	_, err := os.Stat(File)
	if err != nil {
		return err
	}
	data, err := ioutil.ReadFile(File)
	if err != nil {
		return fmt.Errorf("can't load config file: %s", err.Error())
	}
	err = yaml.Unmarshal(data, &config)
	if err != nil {
		return fmt.Errorf("can't unmarshal config file: %s", err.Error())
	}
	readSecret()
	value, _ := yaml.Marshal(config)
	log.Printf("using configfile %s. \nconfiguration:\n%s\n", File, string(value))
	return nil
}

func readSecret() error {
	secretFile := config.SecretFile
	if secretFile != "" {
		data, err := ioutil.ReadFile(secretFile)
		if err != nil {
			return fmt.Errorf("can't load secret file: %s", err.Error())
		}
		var secretConfig Secret = Secret{}
		err = yaml.Unmarshal(data, &secretConfig)
		if err != nil {
			return fmt.Errorf("can't unmarshal secret file: %s", err.Error())
		}
		mergeSecret(secretConfig)
	}
	return nil
}

func mergeSecret(secret Secret) {
	config.MongoDB.Username = secret.MongoDB.Username
	config.MongoDB.Password = secret.MongoDB.Password
}