การอ่าน ENV

env

package main

import (
  "os"
  "github.com/gofiber/fiber/v2"
)

func getEnv(key, fallback string) string {
  if value, exists := os.LookupEnv(key); exists {
    return value
  }
  return fallback
}

func main() {
  app := fiber.New()

  // Setup routes
  app.Get("/api/config", getConfig)

  // Use the environment variable for the port, default to 8080 if not set
  port := getEnv("PORT", "8080")

  app.Listen(":" + port)
}

func getConfig(c *fiber.Ctx) error {
  // Example: Return a configuration value from environment variable
  secretKey := getEnv("SECRET_KEY", "defaultSecret")

  return c.JSON(fiber.Map{
    "secret_key": secretKey,
  })
}

export SECRET_KEY=123 # ทำการเพิ่มตัวแปร environment เข้ามาใหม่

go run main.go

go get github.com/joho/godotenv

PORT=8080
SECRET_KEY=mysecretkey

package main

import (
  "github.com/gofiber/fiber/v2"
  "github.com/joho/godotenv"
  "log"
  "os"
)

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

  app := fiber.New()

  // Setup routes
  app.Get("/api/config", getConfig)

  // Use the environment variable for the port
  port := os.Getenv("PORT")
  if port == "" {
    port = "8080" // Default port if not specified
  }

  app.Listen(":" + port)
}

func getConfig(c *fiber.Ctx) error {
  // Example: Return a configuration value from environment variable
  secretKey := os.Getenv("SECRET_KEY")
  if secretKey == "" {
    secretKey = "defaultSecret" // Default value if not specified
  }

  return c.JSON(fiber.Map{
    "secret_key": secretKey,
  })
}