Config GoDoc

Config is a pluggable dynamic config package

Most config in applications are statically configured or include complex logic to load from multiple sources. Go Config makes this easy, pluggable and mergeable. You'll never have to deal with config in the same way again.


  • Dynamic Loading - Load configuration from multiple source as and when needed. Go Config manages watching config sources in the background and automatically merges and updates an in memory view.

  • Pluggable Sources - Choose from any number of sources to load and merge config. The backend source is abstracted away into a standard format consumed internally and decoded via encoders. Sources can be env vars, flags, file, etcd, k8s configmap, etc.

  • Mergeable Config - If you specify multiple sources of config, regardless of format, they will be merged and presented in a single view. This massively simplifies priority order loading and changes based on environment.

  • Observe Changes - Optionally watch the config for changes to specific values. Hot reload your app using Go Config's watcher. You don't have to handle ad-hoc hup reloading or whatever else, just keep reading the config and watch for changes if you need to be notified.

  • Sane Defaults - In case config loads badly or is completely wiped away for some unknown reason, you can specify fallback values when accessing any config values directly. This ensures you'll always be reading some sane default in the event of a problem.

Getting Started

For detailed information or architecture, installation and general usage see the docs

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Package config is an interface for dynamic configuration.



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View Source
var (
	// Default Config Manager
	DefaultConfig = NewConfig()


func Bytes

func Bytes() []byte

Return config as raw json

func Get

func Get(path ...string) reader.Value

Get a value from the config

func Load

func Load(source ...source.Source) error

Load config sources

func LoadFile

func LoadFile(path string) error

LoadFile is short hand for creating a file source and loading it

func Map

func Map() map[string]interface{}

Return config as a map

func Scan

func Scan(v interface{}) error

Scan values to a go type

func Sync

func Sync() error

Force a source changeset sync


type Config

type Config interface {
	// provide the reader.Values interface
	// Stop the config loader/watcher
	Close() error
	// Load config sources
	Load(source ...source.Source) error
	// Force a source changeset sync
	Sync() error
	// Watch a value for changes
	Watch(path ...string) (Watcher, error)

Config is an interface abstraction for dynamic configuration

func NewConfig

func NewConfig(opts ...Option) Config

NewConfig returns new config

type Option

type Option func(o *Options)

func WithLoader

func WithLoader(l loader.Loader) Option

WithLoader sets the loader for manager config

func WithReader

func WithReader(r reader.Reader) Option

WithReader sets the config reader

func WithSource

func WithSource(s source.Source) Option

WithSource appends a source to list of sources

type Options

type Options struct {
	Loader loader.Loader
	Reader reader.Reader
	Source []source.Source

	// for alternative data
	Context context.Context

type Watcher

type Watcher interface {
	Next() (reader.Value, error)
	Stop() error

Watcher is the config watcher

func Watch

func Watch(path ...string) (Watcher, error)

Watch a value for changes


Path Synopsis
cmd Package cmd is an interface for parsing the command line
encoder Package encoder handles source encoding formats
loader package loader manages loading from multiple sources
options Package options provides a way to initialise options
reader Package reader parses change sets and provides config values
source Package source is the interface for sources
source/file Package file is a file source.
source/memory Package memory is a memory source