micro

Micro

Micro is a toolkit for cloud-native development.

Use go-micro to write services in Go or ja-micro for Java.

Overview

Micro addresses the key requirements for building cloud-native systems. It takes the microservice architecture pattern and transforms it into a set of tools which act as the building blocks for scalable platforms. Micro hides the complexity of distributed systems and provides well understood concepts to developers.

Micro builds on go-micro, making it a pluggable toolkit.

Features

The toolkit is composed of the following features:

• api - API Gateway. A single HTTP entry point. Dynamic routing using service discovery.

• web - Web Gateway and dashboard. Build web apps as microservices.

• cli - Command line interface. Describe, query and interact directly from the terminal.

• bot - Slack and hipchat bot. The CLI via messaging.

• new - New template generation for services.

• proxy - A proxy for remote environments.

Docs

For more detailed information on the architecture, installation and use of the toolkit checkout the docs.

Getting Started

• Writing a Service
• Install Micro
• Service Discovery
• Example usage
• Build with plugins

Writing a service

See go-micro to start writing services.

Install Micro

go get -u github.com/micro/micro

Or via Docker

docker pull microhq/micro

Service Discovery

Service discovery is the only dependency of the micro toolkit. Consul is set as the default.

Internally micro uses the go-micro registry for service discovery. This allows the toolkit to leverage go-micro plugins. Checkout go-plugins to swap out consul.

Consul

On Mac OS

brew install consul
consul agent -dev

mDNS

Multicast DNS is built in for zero dependency service discovery.

Pass --registry=mdns or set the env var MICRO_REGISTRY=mdns for any command

## Use flag
micro --registry=mdns list services

## Use env var
MICRO_REGISTRY=mdns micro list services`

Example

Let's test out the CLI

Run a service

This is a greeter service written with go-micro. Make sure you're running service discovery.

go get github.com/micro/examples/greeter/srv && srv

List services

Each service registers with discovery so we should be able to find it.

micro list services

Output

consul
go.micro.srv.greeter

Get Service

Each service has a unique id, address and metadata.

micro get service go.micro.srv.greeter

Output

service  go.micro.srv.greeter

version 1.0.0

Id	Address	Port	Metadata
go.micro.srv.greeter-34c55534-368b-11e6-b732-68a86d0d36b6	192.168.1.66	62525	server=rpc,registry=consul,transport=http,broker=http

Endpoint: Say.Hello
Metadata: stream=false

Request: {
	name string
}

Response: {
	msg string
}

Call service

Make an RPC call via the CLI. The query is sent in json. We support json and protobuf out of the box.

micro call go.micro.srv.greeter Say.Hello '{"name": "John"}'

Output

{
	"msg": "Hello John"
}

Look at the cli doc for more info.

Now let's test out the micro api

Run the api

Run the greeter API. An API service logically separates frontends from backends.

go get github.com/micro/examples/greeter/api && api

Run the micro api

The micro api is a single HTTP entry point which dynamically routes to rpc services.

micro api

Call via API

Replicating the CLI call as a HTTP call

curl http://localhost:8080/greeter/say/hello?name=John

Output

{"message":"Hello John"}

Look at the api doc for more info.

Plugins

Integrate go-micro plugins by simply linking them in a separate file

Create a plugins.go file

import (
	// etcd v3 registry
	_ "github.com/micro/go-plugins/registry/etcdv3"
	// nats transport
	_ "github.com/micro/go-plugins/transport/nats"
	// kafka broker
	_ "github.com/micro/go-plugins/broker/kafka"
)

Build binary

# For local use
go build -i -o micro ./main.go ./plugins.go

# For docker image
CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -ldflags '-w' -i -o micro ./main.go ./plugins.go

Enable with flags or env vars

# flags
micro --registry=etcdv3 --transport=nats --broker=kafka [command]

# env vars
MICRO_REGISTRY=etcdv3 MICRO_TRANSPORT=nats MICRO_BROKER=kafka micro [command]

Learn more

To learn more read the following micro content

• Docs - documentation and guides
• Toolkit - intro blog post about the toolkit
• Architecture & Design Patterns - details on micro patterns
• Presentation - Golang UK Conf 2016
• Twitter - follow us on Twitter
• Slack - join the slack community (1000+ members)

Community Projects

Explore other projects at micro.mu/explore

Sponsors

Open source development of Micro is sponsored by Sixt