Golang Configuration tool that support YAML, JSON, TOML, Shell Environment
package main
import (
"fmt"
"github.com/jinzhu/configor"
)
var Config = struct {
APPName string `default:"app name"`
DB struct {
Name string
User string `default:"root"`
Password string `required:"true" env:"DBPassword"`
Port uint `default:"3306"`
}
Contacts []struct {
Name string
Email string `required:"true"`
}
}{}
func main() {
configor.Load(&Config, "config.yml")
fmt.Printf("config: %#v", Config)
}With configuration file config.yml:
appname: test
db:
name: test
user: test
password: test
port: 1234
contacts:
- name: i test
email: [email protected]- Load mutiple configurations
// Earlier configurations have higher priority
configor.Load(&Config, "application.yml", "database.json")- Return error on unmatched keys
Return an error on finding keys in the config file that do not match any fields in the config struct. In the example below, an error will be returned if config.toml contains keys that do not match any fields in the ConfigStruct struct. If ErrorOnUnmatchedKeys is not set, it defaults to false. Note that this is currently only supported for toml and yaml files. ErrorOnUnmatchedKeys will be ignored for json files. This may change in the future when the json library adds support for this [golang/go#15314].
err := configor.New(&configor.Config{ErrorOnUnmatchedKeys: true}).Load(&ConfigStruct, "config.toml")- Load configuration by environment
Use CONFIGOR_ENV to set environment, if CONFIGOR_ENV not set, environment will be development by default, and it will be test when running tests with go test
// config.go
configor.Load(&Config, "config.json")
$ go run config.go
// Will load `config.json`, `config.development.json` if it exists
// `config.development.json` will overwrite `config.json`'s configuration
// You could use this to share same configuration across different environments
$ CONFIGOR_ENV=production go run config.go
// Will load `config.json`, `config.production.json` if it exists
// `config.production.json` will overwrite `config.json`'s configuration
$ go test
// Will load `config.json`, `config.test.json` if it exists
// `config.test.json` will overwrite `config.json`'s configuration
$ CONFIGOR_ENV=production go test
// Will load `config.json`, `config.production.json` if it exists
// `config.production.json` will overwrite `config.json`'s configuration// Set environment by config
configor.New(&configor.Config{Environment: "production"}).Load(&Config, "config.json")- Example Configuration
// config.go
configor.Load(&Config, "config.yml")
$ go run config.go
// Will load `config.example.yml` automatically if `config.yml` not found and print warning message- Load From Shell Environment
$ CONFIGOR_APPNAME="hello world" CONFIGOR_DB_NAME="hello world" go run config.go
// Load configuration from shell environment, it's name is {{prefix}}_FieldName// You could overwrite the prefix with environment CONFIGOR_ENV_PREFIX, for example:
$ CONFIGOR_ENV_PREFIX="WEB" WEB_APPNAME="hello world" WEB_DB_NAME="hello world" go run config.go
// Set prefix by config
configor.New(&configor.Config{ENVPrefix: "WEB"}).Load(&Config, "config.json")- Anonymous Struct
Add the anonymous:"true" tag to an anonymous, embedded struct to NOT include the struct name in the environment
variable of any contained fields. For example:
type Details struct {
Description string
}
type Config struct {
Details `anonymous:"true"`
}With the anonymous:"true" tag specified, the environment variable for the Description field is CONFIGOR_DESCRIPTION.
Without the anonymous:"true"tag specified, then environment variable would include the embedded struct name and be CONFIGOR_DETAILS_DESCRIPTION.
- With flags
func main() {
config := flag.String("file", "config.yml", "configuration file")
flag.StringVar(&Config.APPName, "name", "", "app name")
flag.StringVar(&Config.DB.Name, "db-name", "", "database name")
flag.StringVar(&Config.DB.User, "db-user", "root", "database user")
flag.Parse()
os.Setenv("CONFIGOR_ENV_PREFIX", "-")
configor.Load(&Config, *config)
// configor.Load(&Config) // only load configurations from shell env & flag
}
jinzhu
Released under the MIT License