envconfig

README

envconfig

import "github.com/kelseyhightower/envconfig"

Documentation

See godoc

Usage

Set some environment variables:

export MYAPP_DEBUG=false
export MYAPP_PORT=8080
export MYAPP_USER=Kelsey
export MYAPP_RATE="0.5"

Write some code:

package main

import (
    "fmt"
    "log"

    "github.com/kelseyhightower/envconfig"
)

type Specification struct {
    Debug bool
    Port  int
    User  string
    Rate  float32
}

func main() {
    var s Specification
    err := envconfig.Process("myapp", &s)
    if err != nil {
        log.Fatal(err.Error())
    }
    format := "Debug: %v\nPort: %d\nUser: %s\nRate: %f\n"
    _, err = fmt.Printf(format, s.Debug, s.Port, s.User, s.Rate)
    if err != nil {
        log.Fatal(err.Error())
    }
}

Results:

Debug: false
Port: 8080
User: Kelsey
Rate: 0.500000

Documentation

Overview

Package envconfig implements decoding of environment variables based on a user defined specification. A typical use is using environment variables for configuration settings.

Index

• Variables
• func Process(prefix string, spec interface{}) error
• type ParseError
  • func (e *ParseError) Error() string

Variables

var ErrInvalidSpecification = errors.New("invalid specification must be a struct")

ErrInvalidSpecification indicates that a specification is of the wrong type.

Functions

func Process

func Process(prefix string, spec interface{}) error

Types

type ParseError

type ParseError struct {
	KeyName   string
	FieldName string
	TypeName  string
	Value     string
}

A ParseError occurs when an environment variable cannot be converted to the type required by a struct field during assignment.

func (*ParseError) Error

func (e *ParseError) Error() string