Go Micro

Go Micro is a framework for distributed systems development.

Overview

Go Micro provides the core requirements for distributed systems development including RPC and Event driven communication. The Go Micro philosophy is sane defaults with a pluggable architecture. We provide defaults to get you started quickly but everything can be easily swapped out.

Features

Go Micro abstracts away the details of distributed systems. Here are the main features.

• Authentication - Auth is built in as a first class citizen. Authentication and authorization enable secure zero trust networking by providing every service an identity and certificates. This additionally includes rule based access control.

• Dynamic Config - Load and hot reload dynamic config from anywhere. The config interface provides a way to load application level config from any source such as env vars, file, etcd. You can merge the sources and even define fallbacks.

• Data Storage - A simple data store interface to read, write and delete records. It includes support for many storage backends in the plugins repo. State and persistence becomes a core requirement beyond prototyping and Micro looks to build that into the framework.

• Service Discovery - Automatic service registration and name resolution. Service discovery is at the core of micro service development. When service A needs to speak to service B it needs the location of that service. The default discovery mechanism is multicast DNS (mdns), a zeroconf system.

• Load Balancing - Client side load balancing built on service discovery. Once we have the addresses of any number of instances of a service we now need a way to decide which node to route to. We use random hashed load balancing to provide even distribution across the services and retry a different node if there's a problem.

• Message Encoding - Dynamic message encoding based on content-type. The client and server will use codecs along with content-type to seamlessly encode and decode Go types for you. Any variety of messages could be encoded and sent from different clients. The client and server handle this by default. This includes protobuf and json by default.

• RPC Client/Server - RPC based request/response with support for bidirectional streaming. We provide an abstraction for synchronous communication. A request made to a service will be automatically resolved, load balanced, dialled and streamed.

• Async Messaging - PubSub is built in as a first class citizen for asynchronous communication and event driven architectures. Event notifications are a core pattern in micro service development. The default messaging system is a HTTP event message broker.

• Pluggable Interfaces - Go Micro makes use of Go interfaces for each distributed system abstraction. Because of this these interfaces are pluggable and allows Go Micro to be runtime agnostic. You can plugin any underlying technology.

Getting Started

To make use of Go Micro import it

import "go-micro.dev/v5"

Create a service and register a handler

package main

import (
        "go-micro.dev/v5"
)

type Request struct {
        Name string `json:"name"`
}

type Response struct {
        Message string `json:"message"`
}

type Say struct{}

func (h *Say) Hello(ctx context.Context, req *Request, rsp *Response) error {
        rsp.Message = "Hello " + req.Name
        return nil
}

func main() {
        // create the service
        service := micro.New("helloworld")

        // register handler
        service.Handle(new(Say))

        // run the service
        service.Run()
}

Optionally set fixed address

service := micro.NewService(
    micro.Address(":8080"),
)

Call it via curl

curl -XPOST \
     -H 'Content-Type: application/json' \
     -H 'Micro-Endpoint: Say.Hello' \
     -d '{"name": "alice"}' \
      http://localhost:8080

Micro

Use the Micro cli to call it

micro call helloworld Say.Hello '{"name": "Asim"}'

Run the micro api and call it via http

micro api

Call it via http://localhost:8080/

curl -d '{"name": "Asim"}' https://localhost:8080/helloworld/Say/Hello

Protobuf

Protobuf is supported via protoc-gen-micro

Plugins

See Plugins for implementations of the various core interfaces.