Programming language: Go
License: MIT License
Tags: Messaging    

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Package EventBus is the little and lightweight eventbus with async compatibility for GoLang.


Make sure that Go is installed on your computer. Type the following command in your terminal:

go get github.com/asaskevich/EventBus

After it the package is ready to use.

Import package in your project

Add following line in your *.go file:

import "github.com/asaskevich/EventBus"

If you unhappy to use long EventBus, you can do something like this:

import (
    evbus "github.com/asaskevich/EventBus"


func calculator(a int, b int) {
    fmt.Printf("%d\n", a + b)

func main() {
    bus := EventBus.New();
    bus.Subscribe("main:calculator", calculator);
    bus.Publish("main:calculator", 20, 40);
    bus.Unsubscribe("main:calculator", calculator);

Implemented methods

  • New()
  • Subscribe()
  • SubscribeOnce()
  • HasCallback()
  • Unsubscribe()
  • Publish()
  • SubscribeAsync()
  • SubscribeOnceAsync()
  • WaitAsync()


New returns new EventBus with empty handlers.

bus := EventBus.New();

Subscribe(topic string, fn interface{}) error

Subscribe to a topic. Returns error if fn is not a function.

func Handler() { ... }
bus.Subscribe("topic:handler", Handler)

SubscribeOnce(topic string, fn interface{}) error

Subscribe to a topic once. Handler will be removed after executing. Returns error if fn is not a function.

func HelloWorld() { ... }
bus.SubscribeOnce("topic:handler", HelloWorld)

Unsubscribe(topic string, fn interface{}) error

Remove callback defined for a topic. Returns error if there are no callbacks subscribed to the topic.

bus.Unsubscribe("topic:handler", HelloWord);

HasCallback(topic string) bool

Returns true if exists any callback subscribed to the topic.

Publish(topic string, args ...interface{})

Publish executes callback defined for a topic. Any additional argument will be transferred to the callback.

func Handler(str string) { ... }
bus.Subscribe("topic:handler", Handler)
bus.Publish("topic:handler", "Hello, World!");

SubscribeAsync(topic string, fn interface{}, transactional bool)

Subscribe to a topic with an asynchronous callback. Returns error if fn is not a function.

func slowCalculator(a, b int) {
    time.Sleep(3 * time.Second)
    fmt.Printf("%d\n", a + b)

bus := EventBus.New()
bus.SubscribeAsync("main:slow_calculator", slowCalculator, false)

bus.Publish("main:slow_calculator", 20, 60)

fmt.Println("start: do some stuff while waiting for a result")
fmt.Println("end: do some stuff while waiting for a result")

bus.WaitAsync() // wait for all async callbacks to complete

fmt.Println("do some stuff after waiting for result")

Transactional determines whether subsequent callbacks for a topic are run serially (true) or concurrently(false)

SubscribeOnceAsync(topic string, args ...interface{})

SubscribeOnceAsync works like SubscribeOnce except the callback to executed asynchronously


WaitAsync waits for all async callbacks to complete.

Cross Process Events

Works with two rpc services:

  • a client service to listen to remotely published events from a server
  • a server service to listen to client subscriptions


func main() {
    server := NewServer(":2010", "/_server_bus_", New())
    // ...
    server.EventBus().Publish("main:calculator", 4, 6)
    // ...


func main() {
    client := NewClient(":2015", "/_client_bus_", New())
    client.Subscribe("main:calculator", calculator, ":2010", "/_server_bus_")
    // ...


Documentation is available here: godoc.org. Full information about code coverage is also available here: EventBus on gocover.io.


If you do have a contribution for the package feel free to put up a Pull Request or open Issue.

Special thanks to contributors