config

README

go-config

go-config is a configuration loader package.

See godoc.org/github.com/kayac/go-config.

merge-env-config

merge-env-config is the cli tool to deal with template files.

for example:

{
    "name": "some function name",
    "description": "some description",
    "environment": {
        "secret_key": "{{ env `SOME_SECRET_KEY` }}"
    }
}

$ SOME_SECRET_KEY=some_secret_key merge-env-config -json function.prod.json.tmpl
{
    "name": "some function name",
    "description": "some description",
    "environment": {
        "secret_key": "some_secret_key"
    }
}

Author

Copyright (c) 2017 KAYAC Inc.

LICENSE

MIT

Documentation

Overview

Yaml Config Loader

Index

• Variables
• func Load(conf interface{}, configPaths ...string) error
• func LoadJSON(conf interface{}, configPaths ...string) error
• func LoadTOML(conf interface{}, configPaths ...string) error
• func LoadWithEnv(conf interface{}, configPaths ...string) error
• func LoadWithEnvJSON(conf interface{}, configPaths ...string) error
• func LoadWithEnvTOML(conf interface{}, configPaths ...string) error
• func MarshalJSON(v interface{}) ([]byte, error)

Examples

• Load
• LoadWithEnv

Variables

var Marshal = yaml.Marshal

Marshal serializes the value provided into a YAML document.

Functions

func Load

func Load(conf interface{}, configPaths ...string) error

Load loads YAML files from `configPaths`. and assigns decoded values into the `conf` value.

Example

package main

import (
	"fmt"
	"os"
	"path/filepath"
	"time"

	"github.com/kayac/go-config"
)

var dir string

func main() {
	type DBConfig struct {
		Master  string        `yaml:"master"`
		Slave   string        `yaml:"slave"`
		Timeout time.Duration `yml:"timeout"`
	}
	type Conf struct {
		Domain  string        `yaml:"domain"`
		IsDev   bool          `yaml:"is_dev"`
		Timeout time.Duration `yml:"timeout"`
		DB      DBConfig      `yaml:"db"`
	}

	baseConfig := `
# config.yml
domain: example.com
db:
  master:  rw@/example
  slave:   ro@/example
  timeout: 0.5s
`
	localConfig := `
# config_local.yml
domain: dev.example.com
is_dev: true
`
	conf := &Conf{}
	baseConfigYaml, _ := genConfigFile("config.yml", baseConfig)         // /path/to/config.yml
	localConfigYaml, _ := genConfigFile("config_local.yml", localConfig) // /path/to/config_local.yml

	err := config.Load(conf, baseConfigYaml, localConfigYaml)
	if err != nil {
		panic(err)
	}

	fmt.Printf("%+v", conf)
}

func genConfigFile(name string, config string) (string, error) {
	path := filepath.Join(dir, name)
	io, err := os.Create(path)
	if err != nil {
		return "", err
	}
	if _, err := io.WriteString(config); err != nil {
		return "", err
	}
	return path, nil
}

Output:
&{Domain:dev.example.com IsDev:true Timeout:0s DB:{Master:rw@/example Slave:ro@/example Timeout:500ms}}

func LoadJSON

func LoadJSON(conf interface{}, configPaths ...string) error

Load loads JSON files from `configPaths`. and assigns decoded values into the `conf` value.

func LoadTOML

func LoadTOML(conf interface{}, configPaths ...string) error

Load loads TOML files from `configPaths`. and assigns decoded values into the `conf` value.

func LoadWithEnv

func LoadWithEnv(conf interface{}, configPaths ...string) error

LoadWithEnv loads YAML files with Env replace {{ env "ENV" }} to os.Getenv("ENV") if you set default value then {{ env "ENV" "default" }}

Example

package main

import (
	"fmt"
	"os"
	"path/filepath"
	"time"

	"github.com/kayac/go-config"
)

var dir string

func main() {
	type DBConfig struct {
		Master  string        `yaml:"master"`
		Slave   string        `yaml:"slave"`
		Timeout time.Duration `yml:"timeout"`
	}
	type Conf struct {
		Domain  string        `yaml:"domain"`
		IsDev   bool          `yaml:"is_dev"`
		Timeout time.Duration `yml:"timeout"`
		DB      DBConfig      `yaml:"db"`
	}

	baseConfig := `
# config.yml
domain: {{ env "DOMAIN"}}
db:
  master:  rw@/example
  slave:   ro@/example
  timeout: 0.5s
`
	localConfig := `
# config_local.yml
is_dev: true
db:
  master:  {{ env "RW_USER" "rw" }}@/{{ env "DB_NAME" "example_dev" }}
  slave:   {{ env "RO_USER" "ro" }}@/{{ env "DB_NAME" "example_dev" }}
`
	os.Setenv("DOMAIN", "dev.example.com")
	os.Setenv("DB_NAME", "example_local")

	conf := &Conf{}
	baseConfigYaml, _ := genConfigFile("config.yml", baseConfig)         // /path/to/config.yml
	localConfigYaml, _ := genConfigFile("config_local.yml", localConfig) // /path/to/config_local.yml

	err := config.LoadWithEnv(conf, baseConfigYaml, localConfigYaml)
	if err != nil {
		panic(err)
	}

	fmt.Printf("%+v", conf)
}

func genConfigFile(name string, config string) (string, error) {
	path := filepath.Join(dir, name)
	io, err := os.Create(path)
	if err != nil {
		return "", err
	}
	if _, err := io.WriteString(config); err != nil {
		return "", err
	}
	return path, nil
}

Output:
&{Domain:dev.example.com IsDev:true Timeout:0s DB:{Master:rw@/example_local Slave:ro@/example_local Timeout:500ms}}

func LoadWithEnvJSON

func LoadWithEnvJSON(conf interface{}, configPaths ...string) error

LoadWithEnvJSON loads JSON files with Env

func LoadWithEnvTOML

func LoadWithEnvTOML(conf interface{}, configPaths ...string) error

LoadWithEnvTOML loads TOML files with Env

func MarshalJSON

func MarshalJSON(v interface{}) ([]byte, error)

MarshalJSON returns the JSON encoding of v with indent by 2 white spaces.