YoMo is an open-source Streaming Serverless Framework for building low-latency edge computing applications. Built atop QUIC transport protocol and functional reactive programming interface, it makes real-time data processing reliable, secure, and easy.

Getting Started


Install Go

1. Install CLI

You can easily install the latest CLI release globally by running:

go install github.com/yomorun/cli/yomo@latest

Or you can install the CLI into a specified directory:

env GOBIN=/bin go install github.com/yomorun/cli/yomo@latest

Verify Your YoMo CLI Installation

Use the following command to verify that the installation was successful:

$ yomo -V
Quiz Time: What do you see?
- You're good to go!
- Please make sure you have installed the latest version!

Create a YoMo App

The yomo init command should set up everything for you.

$ yomo init yomo-app-demo

⌛  Initializing the Serverless app...
✅  Congratulations! You have initialized the serverless function successfully.
ℹ️   You can enjoy the YoMo Serverless via the command: 
ℹ️      DEV:    yomo dev -n Noise yomo-app-demo/app.go
ℹ️      PROD:   First run source application, eg: go run example/source/main.go
        Second: yomo run -n yomo-app-demo yomo-app-demo/app.go

$ cd yomo-app-demo

YoMo CLI will automatically create an app.go with the following content:

package main

import (

    y3 "github.com/yomorun/y3-codec-golang"

// NoiseDataKey represents the Tag of a Y3 encoded data packet
const NoiseDataKey = 0x10

// NoiseData represents the structure of data
type NoiseData struct {
    Noise float32 `y3:"0x11"`
    Time  int64   `y3:"0x12"`
    From  string  `y3:"0x13"`

var printer = func(_ context.Context, i interface{}) (interface{}, error) {
    value := i.(NoiseData)
    rightNow := time.Now().UnixNano() / int64(time.Millisecond)
    fmt.Println(fmt.Sprintf("[%s] %d > value: %f ⚡️=%dms", value.From, value.Time, value.Noise, rightNow-value.Time))
    return value.Noise, nil

var callback = func(v []byte) (interface{}, error) {
    var mold NoiseData
    err := y3.ToObject(v, &mold)
    if err != nil {
        return nil, err
    mold.Noise = mold.Noise / 10
    return mold, nil

// Handler will handle data in Rx way
func Handler(rxstream rx.RxStream) rx.RxStream {
    stream := rxstream.

    return stream

3. Build and Run

Run yomo dev from the terminal. you will see the following message:

$ yomo dev

ℹ️   YoMo serverless function file: app.go
⌛  Create YoMo serverless instance...
⌛  YoMo serverless function building...
✅  Success! YoMo serverless function build.
ℹ️   YoMo serverless function is running...
ℹ️   Run: /Users/xiaojianhong/Downloads/yomo-app-demo/sl.yomo
2021/06/07 12:00:06 Connecting to zipper dev.yomo.run:9000 ...
2021/06/07 12:00:07 ✅ Connected to zipper dev.yomo.run:9000
[] 1623038407236 > value: 1.919251 ⚡️=-25ms
[StdOut]:  1.9192511
[] 1623038407336 > value: 11.370256 ⚡️=-25ms
[StdOut]:  11.370256
[] 1623038407436 > value: 8.672209 ⚡️=-25ms
[StdOut]:  8.672209
[] 1623038407536 > value: 4.826996 ⚡️=-25ms
[StdOut]:  4.826996
[] 1623038407636 > value: 16.201773 ⚡️=-25ms
[StdOut]:  16.201773
[] 1623038407737 > value: 13.875483 ⚡️=-26ms
[StdOut]:  13.875483



🎯 Focuses on computing at the edge

YoMo is best for:

  • Making latency-sensitive applications.
  • Dealing with high network latency and packet loss.
  • Handling continuous high-frequency data with stream processing.
  • Building complex systems with streaming serverless architecture.


First off, thank you for considering making contributions. It's people like you that make YoMo better. There are many ways in which you can participate in this project, for example:

  • File a bug report. Be sure to include information like what version of YoMo you are using, what your operating system is, and steps to recreate the bug.
  • Suggest a new feature.
  • Read our contributing guidelines to learn about what types of contributions we are looking for.
  • We have also adopted a code of conduct that we expect project participants to adhere to.


If you have any questions, please feel free to come to our discussion board. Any feedback would be greatly appreciated!


Apache License 2.0


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