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109 lines
4.3 KiB
Markdown
109 lines
4.3 KiB
Markdown
# Go Micro [](https://pkg.go.dev/go-micro.dev/v5?tab=doc) [](https://goreportcard.com/report/github.com/go-micro/go-micro)
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Go Micro is a framework for distributed systems development.
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## Overview
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Go Micro provides the core requirements for distributed systems development including RPC and Event driven communication.
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The Go Micro philosophy is sane defaults with a pluggable architecture. We provide defaults to get you started quickly
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but everything can be easily swapped out.
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## Features
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Go Micro abstracts away the details of distributed systems. Here are the main features.
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- **Authentication** - Auth is built in as a first class citizen. Authentication and authorization enable secure
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zero trust networking by providing every service an identity and certificates. This additionally includes rule
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based access control.
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- **Dynamic Config** - Load and hot reload dynamic config from anywhere. The config interface provides a way to load application
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level config from any source such as env vars, file, etcd. You can merge the sources and even define fallbacks.
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- **Data Storage** - A simple data store interface to read, write and delete records. It includes support for many storage backends
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in the plugins repo. State and persistence becomes a core requirement beyond prototyping and Micro looks to build that into the framework.
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- **Service Discovery** - Automatic service registration and name resolution. Service discovery is at the core of micro service
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development. When service A needs to speak to service B it needs the location of that service. The default discovery mechanism is
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multicast DNS (mdns), a zeroconf system.
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- **Load Balancing** - Client side load balancing built on service discovery. Once we have the addresses of any number of instances
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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
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across the services and retry a different node if there's a problem.
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- **Message Encoding** - Dynamic message encoding based on content-type. The client and server will use codecs along with content-type
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to seamlessly encode and decode Go types for you. Any variety of messages could be encoded and sent from different clients. The client
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and server handle this by default. This includes protobuf and json by default.
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- **RPC Client/Server** - RPC based request/response with support for bidirectional streaming. We provide an abstraction for synchronous
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communication. A request made to a service will be automatically resolved, load balanced, dialled and streamed.
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- **Async Messaging** - PubSub is built in as a first class citizen for asynchronous communication and event driven architectures.
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Event notifications are a core pattern in micro service development. The default messaging system is a HTTP event message broker.
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- **Pluggable Interfaces** - Go Micro makes use of Go interfaces for each distributed system abstraction. Because of this these interfaces
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are pluggable and allows Go Micro to be runtime agnostic. You can plugin any underlying technology.
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## Getting Started
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To make use of Go Micro import it
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```golang
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import "go-micro.dev/v5"
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```
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Define a handler (protobuf is optionally supported - see [example](https://github.com/go-micro/examples/blob/main/helloworld/main.go))
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```golang
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type Request struct {
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Name string `json:"name"`
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}
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type Response struct {
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Message string `json:"message"`
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}
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type Helloworld struct{}
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func (h *Helloworld) Greeting(ctx context.Context, req *Request, rsp *Response) error {
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rsp.Message = "Hello " + req.Name
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return nil
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}
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```
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Create, initialise and run the service
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```golang
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// create a new service
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service := micro.NewService(
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micro.Name("helloworld"),
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micro.Handle(new(Helloworld)),
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)
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// initialise flags
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service.Init()
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// start the service
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service.Run()
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```
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Optionally set fixed address
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```golang
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service := micro.NewService(
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// set address
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micro.Address(":8080"),
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)
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```
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Call it via curl
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```
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curl -XPOST \
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-H 'Content-Type: application/json' \
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-H 'Micro-Endpoint: Helloworld.Greeting' \
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-d '{"name": "alice"}' \
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http://localhost:8080
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```
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