Env Plugin

The Env plugin makes environment variables available to your rfw app at build time. It collects variables prefixed with RFW_ and generates a temporary Go package (rfwenv) that exposes them through a simple getter.

Features

• Reads all environment variables starting with RFW_.
  
• Generates a temporary rfwenv package with a Get(key) function.
  
• Cleans up the generated code after the build finishes.
  
• Keeps values available in Go code without manual parsing.
  

Usage

1. Set environment variables with the prefix RFW_.
   

   export RFW_API_URL=https://api.example.com
   export RFW_FEATURE_FLAG=true

1. Register the plugin in your app (usually automatic):
   

   import (
       core "github.com/rfwlab/rfw/v2/core"
       env "github.com/rfwlab/rfw/v2/plugins/env"
   )

   func main() {
       core.RegisterPlugin(&env.plugin{})
   }

1. Use the generated package in your Go code:
   

   import "rfwenv"

   func main() {
       api := rfwenv.Get("API_URL")
       println("API URL:", api)
   }

API Reference

The generated package contains:

Notes

• Only variables starting with RFW_ are included. The prefix is stripped in rfwenv.Get.
  
• The generated package exists only during the build and is deleted afterward.
  
• If two variables share the same key (case-sensitive), the last one defined in the environment will be used.
  
• Useful for injecting build-time configuration such as API endpoints, flags, or keys.