Tools / Envy

Envy

Envy makes working with ENV variables in Go trivial.

Repository: gobuffalo/envy
Forks: 14
Watchers: 12
Stars: 84

envy

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Envy makes working with ENV variables in Go trivial.

  • Get ENV variables with default values.
  • Set ENV variables safely without affecting the underlying system.
  • Temporarily change ENV vars; useful for testing.
  • Map all of the key/values in the ENV.
  • Loads .env files (by using godotenv)
  • More!

Installation

$ go get -u github.com/gobuffalo/envy

Usage

func Test_Get(t *testing.T) {
	r := require.New(t)
	r.NotZero(os.Getenv("GOPATH"))
	r.Equal(os.Getenv("GOPATH"), envy.Get("GOPATH", "foo"))
	r.Equal("bar", envy.Get("IDONTEXIST", "bar"))
}

func Test_MustGet(t *testing.T) {
	r := require.New(t)
	r.NotZero(os.Getenv("GOPATH"))
	v, err := envy.MustGet("GOPATH")
	r.NoError(err)
	r.Equal(os.Getenv("GOPATH"), v)

	_, err = envy.MustGet("IDONTEXIST")
	r.Error(err)
}

func Test_Set(t *testing.T) {
	r := require.New(t)
	_, err := envy.MustGet("FOO")
	r.Error(err)

	envy.Set("FOO", "foo")
	r.Equal("foo", envy.Get("FOO", "bar"))
}

func Test_Temp(t *testing.T) {
	r := require.New(t)

	_, err := envy.MustGet("BAR")
	r.Error(err)

	envy.Temp(func() {
		envy.Set("BAR", "foo")
		r.Equal("foo", envy.Get("BAR", "bar"))
		_, err = envy.MustGet("BAR")
		r.NoError(err)
	})

	_, err = envy.MustGet("BAR")
	r.Error(err)
}

.env files support

Envy now supports loading .env files by using the godotenv library. That means one can use and define multiple .env files which will be loaded on-demand. By default, no env files will be loaded. To load one or more, you need to call the envy.Load function in one of the following ways:

envy.Load() // 1

envy.Load("MY_ENV_FILE") // 2

envy.Load(".env", ".env.prod") // 3

envy.Load(".env", "NON_EXISTING_FILE") // 4

// 5
envy.Load(".env")
envy.Load("NON_EXISTING_FILE")

// 6
envy.Load(".env", "NON_EXISTING_FILE", ".env.prod")
  1. Will load the default .env file
  2. Will load the file MY_ENV_FILE, but not .env
  3. Will load the file .env, and after that will load the .env.prod file. If any variable is redefined in . env.prod it will be overwritten (will contain the env.prod value)
  4. Will load the .env file and return an error as the second file does not exist. The values in .env will be loaded and available.
  5. Same as 4
  6. Will load the .env file and return an error as the second file does not exist. The values in .env will be loaded and available, but the ones in .env.prod won't.
License: MIT License - A short and simple permissive license with conditions only requiring preservation of copyright and license notices. Licensed works, modifications, and larger works may be distributed under different terms and without source code.

MIT License

Copyright (c) [year] [fullname]

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.