Genv is a library for Go (golang) that makes it easy to read and use environment variables in your projects. It also allows environment variables to be loaded from the .env file.
go get github.com/sakirsensoy/genv
Create a .env
file in the root directory of your project and enter the environment variables you want to use:
# .env
APP_HOST=localhost
APP_PORT=1234
APP_DEBUG=true
In the meantime, it is optional to use the .env
file. You can also send environment variables to your project in classic ways:
APP_HOST=localhost ./myproject
Rather than using your environment variables directly in your project, it is better to map and match them with a struct. Below you can see how we get our application parameters from environment variables:
// config/config.go
package config
import "github.com/sakirsensoy/genv"
type appConfig struct {
Host string
Port int
Debug bool
}
var App = &appConfig{
Host: genv.Key("APP_HOST").String(),
Port: genv.Key("APP_PORT").Default(8080).Int(),
Debug: genv.Key("APP_DEBUG").Default(false).Bool(),
}
In main.go
we first include the package that allows you to automatically load the environment variables from the .env file. Then we can include and use the parameters defined in config.go
:
// main.go
package main
import (
_ "github.com/sakirsensoy/genv/dotenv/autoload"
"fmt"
"myproject/config"
)
func main() {
fmt.Println(config.App.Host) // localhost
fmt.Println(config.App.Port) // 1234
fmt.Println(config.App.Debug) // true
}
Genv provides an easy-to-use API for accessing environment variables.
First we specify the key to the variable want to access
var env = genv.Key("MY_VARIABLE")
Define default value (optional)
env = env.Default("default_value")
Finally, we specify the type of the environment variable and pass its contents to another variable
var myVariable = env.String()
Genv provides support for the following data types:
String()
: Returns data of String typeInt()
: Returns data of Int32 typeFloat()
: Returns data of Float64 typeBool()
: Returns data of Bool type
For other types, you can use type conversion:
var stringValue = genv.Key("KEY").String()
var byteArrayValue = []byte(stringValue)
Thanks in advance for your contributions :) I would appreciate it if you make sure that the API remains simple when developing.
code changes without tests will not be accepted
- Fork it
- Create your feature branch (
git checkout -b my-new-feature
) - Commit your changes (
git commit -am 'Added some feature'
) - Push to the branch (
git push origin my-new-feature
) - Create new Pull Request
© Şakir Şensoy, 2019 ~ time.Now()
Released under the MIT License