Micro

A Go microservices toolkit

Overview

Micro is an ecosystem for Go microservices development. It provides the tools required for building services in the cloud. The core of Micro is the Go Micro framework, which developers import and use in their code to write services. Surrounding this we introduce a number of tools to make it easy to serve and consume services.

Install the CLI

Install micro via go get

go get github.com/micro/micro/v5@latest

Or via install script

wget -q  https://raw.githubusercontent.com/micro/micro/master/scripts/install.sh -O - | /bin/bash

For releases see the latest tag

Create a service

Create your service and follow the guide

micro new helloworld

Tidy and make protos

cd helloworld
go mod tidy
make proto

Run the service

Run the service

micro run .

List services to see it's running and registered itself

micro services

Describe the service

Describe the service to see available endpoints

micro describe helloworld

Output

{
    "name": "helloworld",
    "version": "latest",
    "metadata": null,
    "endpoints": [
        {
            "request": {
                "name": "Request",
                "type": "Request",
                "values": [
                    {
                        "name": "name",
                        "type": "string",
                        "values": null
                    }
                ]
            },
            "response": {
                "name": "Response",
                "type": "Response",
                "values": [
                    {
                        "name": "msg",
                        "type": "string",
                        "values": null
                    }
                ]
            },
            "metadata": {},
            "name": "Helloworld.Call"
        },
        {
            "request": {
                "name": "Context",
                "type": "Context",
                "values": null
            },
            "response": {
                "name": "Stream",
                "type": "Stream",
                "values": null
            },
            "metadata": {
                "stream": "true"
            },
            "name": "Helloworld.Stream"
        }
    ],
    "nodes": [
        {
            "metadata": {
                "broker": "http",
                "protocol": "mucp",
                "registry": "mdns",
                "server": "mucp",
                "transport": "http"
            },
            "id": "helloworld-31e55be7-ac83-4810-89c8-a6192fb3ae83",
            "address": "127.0.0.1:39963"
        }
    ]
}

Call the service

Call the service using the CLI

micro call helloworld Helloworld.Call '{"name": "Asim"}'

Create a client

Create a client to call the service

package main

import (
        "context"
        "fmt"

        "go-micro.dev/v5"
)

type Request struct {
        Name string
}

type Response struct {
        Message string
}

func main() {
        client := micro.New("helloworld").Client()

        req := client.NewRequest("helloworld", "Helloworld.Call", &Request{Name: "John"})

        var rsp Response

        err := client.Call(context.TODO(), req, &rsp)
        if err != nil {
                fmt.Println(err)
                return
        }

        fmt.Println(rsp.Message)
}

Call via API

Run the API

micro api

If you have the service running

curl http://localhost:8080/helloworld/Helloworld/Call -d '{"name": "John"}'

Call via Web

Access services via the web

Run the web app

micro web

Go to localhost:8082