Added environment variables

config/config.go

@@ -0,0 +1,46 @@
+package config
+
+import (
+	"log"
+
+	"github.com/joho/godotenv"
+)
+
+// AppConfig contains application configuration
+var AppConfig Config
+
+// Load application configuration
+func Load() error {
+
+	// load .env file
+	err := godotenv.Load()
+
+	if err != nil {
+		log.Println(".env file not presented. Retrieving configuration from environment variables")
+	}
+
+	AppConfig = Config{
+		
+		Service: Service{
+			// 9000 DEFAULT FOR DEV ENVIRONMENT
+			Port:        getEnv("NOVATECH_SERVICE_PORT", "9000"),
+			Environment: getEnv("NOVATECH_SERVICE_ENVIRONMENT", "DEV"),
+		},
+		AdminService: Service{
+			// 8080 DEFAULT FOR DEV ENVIRONMENT
+			Port:        getEnv("NOVATECH_ADMIN_SERVICE_PORT", "8080"),
+			Environment: getEnv("NOVATECH_ADMIN_SERVICE_ENVIRONMENT", "DEV"),
+		},
+		Database: Database{
+			UserName:         mustGetEnv("NOVATECH_DATABASE_USERNAME"),
+			Password:         mustGetEnv("NOVATECH_DATABASE_PASSWORD"),
+			DatabaseName:             mustGetEnv("NOVATECH_DATABASE_NAME"),
+			HostName:          mustGetEnv("NOVATECH_DATABASE_ADDRESS"),
+			Port:             mustGetEnv("NOVATECH_DATABASE_PORT"),
+			
+		},
+		
+	}
+
+	return nil
+}

config/helpers.go

@@ -0,0 +1,73 @@
+package config
+
+import (
+	"log"
+	"os"
+	"strconv"
+)
+
+// getEnv returns value for give key from environment
+// if key is not present in environment it returns defaultValue
+func getEnv(key, defaultValue string) string {
+	v := os.Getenv(key)
+	if len(v) > 0 {
+		return v
+	}
+	return defaultValue
+}
+
+// getEnvInt returns integer value for give key from environment
+// if key is not present in environment it returns defaultValue
+// if key cannot be parsed to integer function will panic
+func getEnvInt(key string, defaultValue int) int {
+	v := os.Getenv(key)
+	if len(v) == 0 {
+		return defaultValue
+	}
+
+	valInteger, err := strconv.Atoi(v)
+	if err != nil {
+		log.Fatalf("variable `%s` cannot be parsed to INTEGER", key)
+	}
+
+	return valInteger
+}
+
+// getEnvInt returns integer value for give key from environment
+// if key is not present in environment it returns defaultValue
+// if key cannot be parsed to integer function will panic
+func getEnvBoolWithDefault(key string, defaultValue bool) bool {
+	v := os.Getenv(key)
+	if len(v) == 0 {
+		return defaultValue
+	}
+
+	val, err := strconv.ParseBool(v)
+	if err != nil {
+		log.Fatalf("variable `%s` cannot be parsed to BOOL", key)
+	}
+
+	return val
+}
+
+// getEnv extracts the bool value from environment variable
+func getEnvBool(env string) bool {
+	envVal := mustGetEnv(env)
+	value, err := strconv.ParseBool(envVal)
+
+	if err != nil {
+		value = false
+	}
+
+	return value
+}
+
+// mustGetEnv returns value for give key from environment
+// if key is not present in environment function will panic
+func mustGetEnv(key string) string {
+	v := os.Getenv(key)
+	if len(v) == 0 {
+		log.Fatalf(" variable `%s` is not present in ENVIRONMENT", key)
+	}
+	return v
+}

config/models.go

@@ -0,0 +1,26 @@
+package config
+
+// Config stores application configuration
+type Config struct {
+	Service                       Service
+	AdminService                  Service
+	Database                      Database
+}
+
+
+// Service contains configuration for service
+type Service struct {
+	Port        string
+	Environment string
+	WebPageURL  string
+}
+
+// Database configuration
+type Database struct {
+	UserName         string
+	Password         string
+	DatabaseName             string
+	HostName          string
+	Port             string
+}
+