config

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Published: Mar 6, 2020 License: Apache-2.0 Imports: 10 Imported by: 2

README

Config GoDoc

Go Config is a pluggable dynamic config library.

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.

Features

  • 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

Documentation

Overview

Package config is an interface for dynamic configuration.

Index

Constants

This section is empty.

Variables

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

Functions

func Bytes added in v0.6.0

func Bytes() []byte

Return config as raw json

func Get added in v0.6.0

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

Get a value from the config

func Load added in v0.6.0

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

Load config sources

func LoadFile added in v0.13.1

func LoadFile(path string) error

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

func Map added in v0.6.0

func Map() map[string]interface{}

Return config as a map

func Scan added in v0.6.0

func Scan(v interface{}) error

Scan values to a go type

func Sync added in v0.6.0

func Sync() error

Force a source changeset sync

Types

type Config

type Config interface {
	// provide the reader.Values interface
	reader.Values
	// 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 added in v0.8.0

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 added in v0.6.0

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

Watch a value for changes

Directories

Path Synopsis
hcl
xml
package loader manages loading from multiple sources
package loader manages loading from multiple sources
Package reader parses change sets and provides config values
Package reader parses change sets and provides config values
Package source is the interface for sources
Package source is the interface for sources
configmap
Package configmap config is an interface for dynamic configuration.
Package configmap config is an interface for dynamic configuration.
env
file
Package file is a file source.
Package file is a file source.
grpc/proto
Package grpc is a generated protocol buffer package.
Package grpc is a generated protocol buffer package.
memory
Package memory is a memory source
Package memory is a memory source
runtimevar
package runtimevar is the source for gocloud.dev/runtimevar
package runtimevar is the source for gocloud.dev/runtimevar
url
Package url loads changesets from a url
Package url loads changesets from a url

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