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Programming language: Go
License: MIT License
Tags: Configuration    
Latest version: v1.3.0

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README

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This library is made up of two parts :

  • Env object : it wraps your environments variables in an object and provides convenient helpers.
  • Env tree object : it manages environment variables through a tree structure to store a config the same way as in a yaml file or whatever format allows to store a config hierarchically

Install

go get github.com/antham/envh

How it works

Check the godoc, there are many examples provided.

Example with a tree dumped in a config struct

package envh

import (
    "encoding/json"
    "fmt"
    "os"
    "strings"
)

type CONFIG2 struct {
    DB struct {
        USERNAME   string
        PASSWORD   string
        HOST       string
        NAME       string
        PORT       int
        URL        string
        USAGELIMIT float32
    }
    MAILER struct {
        HOST     string
        USERNAME string
        PASSWORD string
        ENABLED  bool
    }
    MAP map[string]string
}

func (c *CONFIG2) Walk(tree *EnvTree, keyChain []string) (bool, error) {
    if setter, ok := map[string]func(*EnvTree, []string) error{
        "CONFIG2_DB_URL": c.setURL,
        "CONFIG2_MAP":    c.setMap,
    }[strings.Join(keyChain, "_")]; ok {
        return true, setter(tree, keyChain)
    }

    return false, nil
}

func (c *CONFIG2) setMap(tree *EnvTree, keyChain []string) error {
    datas := map[string]string{}

    keys, err := tree.FindChildrenKeys(keyChain...)

    if err != nil {
        return err
    }

    for _, key := range keys {
        value, err := tree.FindString(append(keyChain, key)...)

        if err != nil {
            return err
        }

        datas[key] = value
    }

    c.MAP = datas

    return nil
}

func (c *CONFIG2) setURL(tree *EnvTree, keyChain []string) error {
    datas := map[string]string{}

    for _, key := range []string{"USERNAME", "PASSWORD", "HOST", "NAME"} {
        value, err := tree.FindString("CONFIG2", "DB", key)

        if err != nil {
            return err
        }

        datas[key] = value
    }

    port, err := tree.FindInt("CONFIG2", "DB", "PORT")

    if err != nil {
        return err
    }

    c.DB.URL = fmt.Sprintf("jdbc:mysql://%s:%d/%s?user=%s&password=%s", datas["HOST"], port, datas["NAME"], datas["USERNAME"], datas["PASSWORD"])

    return nil
}

func ExampleStructWalker_customFieldSet() {
    os.Clearenv()
    setEnv("CONFIG2_DB_USERNAME", "foo")
    setEnv("CONFIG2_DB_PASSWORD", "bar")
    setEnv("CONFIG2_DB_HOST", "localhost")
    setEnv("CONFIG2_DB_NAME", "my-db")
    setEnv("CONFIG2_DB_PORT", "3306")
    setEnv("CONFIG2_DB_USAGELIMIT", "95.6")
    setEnv("CONFIG2_MAILER_HOST", "127.0.0.1")
    setEnv("CONFIG2_MAILER_USERNAME", "foo")
    setEnv("CONFIG2_MAILER_PASSWORD", "bar")
    setEnv("CONFIG2_MAILER_ENABLED", "true")
    setEnv("CONFIG2_MAP_KEY1", "value1")
    setEnv("CONFIG2_MAP_KEY2", "value2")
    setEnv("CONFIG2_MAP_KEY3", "value3")

    env, err := NewEnvTree("^CONFIG2", "_")

    if err != nil {
        return
    }

    s := CONFIG2{}

    err = env.PopulateStruct(&s)

    if err != nil {
        return
    }

    b, err := json.Marshal(s)

    if err != nil {
        return
    }

    fmt.Println(string(b))
    // Output:
    // {"DB":{"USERNAME":"foo","PASSWORD":"bar","HOST":"localhost","NAME":"my-db","PORT":3306,"URL":"jdbc:mysql://localhost:3306/my-db?user=foo\u0026password=bar","USAGELIMIT":95.6},"MAILER":{"HOST":"127.0.0.1","USERNAME":"foo","PASSWORD":"bar","ENABLED":true},"MAP":{"KEY1":"value1","KEY2":"value2","KEY3":"value3"}}
}