How to Maintain Persistent Environment Variables in Go?

Maintaining Persistent Environment Variables in Go

Setting environment variables using os.Setenv creates variables accessible only within the current Go process. If you desire a persistent configuration across process terminations, this approach won't suffice.

Solution: Maintain a Configuration File

Instead of relying on environment variables, it's recommended to manage configuration in a central file. This file can contain settings for various environments (such as local and development). You can use popular Go libraries like ini or yaml to handle file parsing.

To configure the file:

1. Save configuration updates to the file after any changes.
2. Save the file upon process exit or periodically during runtime.

Example

<code class="go">import (
    "fmt"
    "os"
)

func main() {
    config, err := ReadConfig("config.yaml")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println(config.DBHost)
}</code>

Using this approach, your setup script (e.g., setup.go) can:

<code class="go">import (
    "fmt"
    "os"
)

func main() {
    SaveConfig("config.yaml", Config{
        DBHost: "localhost",
    })
    fmt.Println("Configuration saved in config.yaml.\nRestart your application to use this configuration.")
}</code>

This method provides a flexible and persistent way to manage configuration while maintaining code separation between your application and configuration logic.

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