how to create dinamic port in golang (echo framwork)

i have package config.go in this my code

package config
import (
	"fmt"
	logger "github.com/sirupsen/logrus"
	"gorm.io/driver/postgres"
	"gorm.io/gorm"
)
func DatabaseConnect() *gorm.DB {
DBURL := fmt.Sprintf("host=%s port=%s user=%s dbname=%s sslmode=disable password=%s", pkg.GodotEnv("DB_HOST"), pkg.GodotEnv("DB_PORT"), pkg.GodotEnv("DB_USER"), pkg.GodotEnv("DB_NAME"), pkg.GodotEnv("DB_PASSWORD"))

	db, err := gorm.Open(postgres.Open(DBURL), &gorm.Config{})

	if err != nil {
		defer logger.Info("Database connection failed")
		logger.Fatal(err)
		return nil
	}

	return db
}

and main.go

func main() {
	e := echo.New()
	db := config.DatabaseConnect()
	middleware.WebSecurityConfig(e)
	routes.NewRoute(db, e)
	e.Logger.Fatal(e.Start(":8080"))
}

I want to create a dynamic routing like the example below :

server.Initialize(os.Getenv("DB_DRIVER"), os.Getenv("DB_USER"), os.Getenv("DB_PASSWORD"), os.Getenv("DB_PORT"), os.Getenv("DB_HOST"), os.Getenv("DB_NAME")) 

server.Run(":" + os.Getenv("PORT"))

how to create dinamic port server ? thanks

Check this out: https://github.com/joho/godotenv.

Add your application configuration to your .env file in the root of your project:

DB_DRIVER=mysql
DB_USER=root
...

Then in your Go app you can do something like:

package main

import (
    "log"
    "os"

    "github.com/joho/godotenv"
)

func main() {
  err := godotenv.Load()
  if err != nil {
    log.Fatal("Error loading .env file")
  }

  driver:= os.Getenv("DB_DRIVER")
  user:= os.Getenv("DB_USER")
  // todo

}