go-plugins

README

Go Plugins

A repository for go-micro plugins.

Check out the Micro on NATS blog post to learn more about plugins.

Follow us on Twitter at @MicroHQ, join the Slack community here or check out the Mailing List.

What's here?

Directory	Description
Broker	Asynchronous Pub/Sub; NATS, NSQ, RabbitMQ, Kafka
Client	Alternative clients; gRPC, HTTP
Codec	RPC Encoding; BSON, Mercury
KV	Key-Value; Memcached, Redis
Metrics	Instrumentation; Statsd, Telegraf, Prometheus
Micro	Micro Toolkit Plugins
Registry	Service Discovery; Etcd, Gossip, NATS
Selector	Node Selection; Label, Mercury
Server	Alternative servers; gRPC, HTTP
Sync	Locking/Leadership election; Consul, Etcd
Trace	Distributed tracing; Zipkin
Transport	Synchronous Request/Response; NATS, RabbitMQ
Wrappers	Client/Server middleware; Circuit Breakers, Rate Limit

Community Contributions

Feature	Description	Author
Registry/Kubernetes	Service discovery via the Kubernetes API	@nickjackson
Registry/Zookeeper	Service discovery using Zookeeper	@HeavyHorst

Usage

Plugins can be added to go-micro in the following ways. By doing so they'll be available to set via command line args or environment variables.

Import Plugins

import (
	"github.com/micro/go-micro/cmd"
	_ "github.com/micro/go-plugins/broker/rabbitmq"
	_ "github.com/micro/go-plugins/registry/kubernetes"
	_ "github.com/micro/go-plugins/transport/nats"
)

func main() {
	// Parse CLI flags
	cmd.Init()
}

The same is achieved when calling service.Init

import (
	"github.com/micro/go-micro"
	_ "github.com/micro/go-plugins/broker/rabbitmq"
	_ "github.com/micro/go-plugins/registry/kubernetes"
	_ "github.com/micro/go-plugins/transport/nats"
)

func main() {
	service := micro.NewService(
		// Set service name
		micro.Name("my.service"),
	)

	// Parse CLI flags
	service.Init()
}

Use via CLI Flags

Activate via a command line flag

go run service.go --broker=rabbitmq --registry=kubernetes --transport=nats

Use Plugins Directly

CLI Flags provide a simple way to initialise plugins but you can do the same yourself.

import (
	"github.com/micro/go-micro"
	"github.com/micro/go-plugins/registry/kubernetes"
)

func main() {
	registry := kubernetes.NewRegistry() //a default to using env vars for master API

	service := micro.NewService(
		// Set service name
		micro.Name("my.service"),
		// Set service registry
		micro.Registry(registry),
	)
}

Build Pattern

You may want to swap out plugins using automation or add plugins to the micro toolkit. An easy way to do this is by maintaining a separate file for plugin imports and including it during the build.

Create file plugins.go

package main

import (
	_ "github.com/micro/go-plugins/broker/rabbitmq"
	_ "github.com/micro/go-plugins/registry/kubernetes"
	_ "github.com/micro/go-plugins/transport/nats"
)

Build with plugins.go

go build -o service main.go plugins.go

Run with plugins

service --broker=rabbitmq --registry=kubernetes --transport=nats