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Sarah is a general purpose bot framework named after author's firstborn daughter.

While the first goal is to prep author to write Go-ish code, the second goal is to provide simple yet highly customizable bot framework.

Supported Chat Services/Protocols

Although a developer may implement sarah.Adapter to integrate with a desired chat service, some adapters are provided as reference implementations:

At a Glance

hello world

Above is a general use of go-sarah. Registered commands are checked against user input and matching one is executed; when a user inputs ".hello," hello command is executed and a message "Hello, 世界" is returned.

Below image depicts how a command with user's conversational context works. The idea and implementation of "user's conversational context" is go-sarah's signature feature that makes bot command "state-aware."

Above example is a good way to let user input series of arguments in a conversational manner. Below is another example that use stateful command to entertain user.

Following is the minimal code that implements such general command and stateful command introduced above. In this example, two ways to implement sarah.Command are shown. One simply implements sarah.Command interface; while another uses sarah.CommandPropsBuilder for lazy construction. Detailed benefits of using sarah.CommandPropsBuilder and sarah.CommandProps are described at its wiki page, CommandPropsBuilder.

For more practical examples, see ./examples.

package main

import (

func main() {
	// Setup slack adapter.
	slackConfig := slack.NewConfig()
	slackConfig.Token = "REPLACE THIS"
	adapter, err := slack.NewAdapter(slackConfig)
	if err != nil {
		panic(fmt.Errorf("faileld to setup Slack Adapter: %s", err.Error()))

	// Setup storage.
	cacheConfig := sarah.NewCacheConfig()
	storage := sarah.NewUserContextStorage(cacheConfig)

	// A helper to stash sarah.RunnerOptions for later use.
	options := sarah.NewRunnerOptions()

	// Setup Bot with slack adapter and default storage.
	bot, err := sarah.NewBot(adapter, sarah.BotWithStorage(storage))
	if err != nil {
		panic(fmt.Errorf("faileld to setup Slack Bot: %s", err.Error()))

	// Setup .hello command
	hello := &HelloCommand{}

	// Setup properties to setup .guess command on the fly

	// Setup sarah.Runner.
	runnerConfig := sarah.NewConfig()
	runner, err := sarah.NewRunner(runnerConfig, options.Arg())
	if err != nil {
		panic(fmt.Errorf("failed to initialize Runner: %s", err.Error()))

	// Run sarah.Runner.

var GuessProps = sarah.NewCommandPropsBuilder().
	MatchFunc(func(input sarah.Input) bool {
		return strings.HasPrefix(strings.TrimSpace(input.Message()), ".guess")
	Func(func(ctx context.Context, input sarah.Input) (*sarah.CommandResponse, error) {
		// Generate answer value at the very beginning.
		answer := rand.Intn(10)

		// Let user guess the right answer.
		return slack.NewStringResponseWithNext("Input number.", func(c context.Context, i sarah.Input) (*sarah.CommandResponse, error) {
			return guessFunc(c, i, answer)
		}), nil

func guessFunc(_ context.Context, input sarah.Input, answer int) (*sarah.CommandResponse, error) {
	// For handiness, create a function that recursively calls guessFunc until user input right answer.
	retry := func(c context.Context, i sarah.Input) (*sarah.CommandResponse, error) {
		return guessFunc(c, i, answer)

	// See if user inputs valid number.
	guess, err := strconv.Atoi(strings.TrimSpace(input.Message()))
	if err != nil {
		return slack.NewStringResponseWithNext("Invalid input format.", retry), nil

	// If guess is right, tell user and finish current user context.
	// Otherwise let user input next guess with bit of a hint.
	if guess == answer {
		return slack.NewStringResponse("Correct!"), nil
	} else if guess > answer {
		return slack.NewStringResponseWithNext("Smaller!", retry), nil
	} else {
		return slack.NewStringResponseWithNext("Bigger!", retry), nil

type HelloCommand struct {

var _ sarah.Command = (*HelloCommand)(nil)

func (hello *HelloCommand) Identifier() string {
	return "hello"

func (hello *HelloCommand) Execute(context.Context, sarah.Input) (*sarah.CommandResponse, error) {
	return slack.NewStringResponse("Hello!"), nil

func (hello *HelloCommand) InputExample() string {
	return ".hello"

func (hello *HelloCommand) Match(input sarah.Input) bool {
	return strings.TrimSpace(input.Message()) == ".hello"


go-sarah is a general purpose bot framework that enables developers to create and customize their own bot experiences with any chat service. This comes with a unique feature called "stateful command" as well as some basic features such as command and scheduled task. In addition to those features, this provides rich life cycle management including live configuration update, customizable alerting mechanism, automated command/task (re-)building and concurrent command/task execution.

go-sarah is composed of fine grained components to provide above features. Those components have their own interfaces and default implementations, so developers are free to customize bot behavior by supplying own implementation.

component diagram

Follow below links for details: