Gateway

Gateway is a http restful API gateway.

Features

• Traffic Control
• Circuit Breaker
• Loadbalance
• Service Discovery
• Plugin mechanism
• Routing based on URL
• API aggregation
• API Validation
• API Access Control(blacklist and whitelist)
• API Mock
• Backend Server heath check
• Use fasthttp
• Admin WEBUI

Install

Gateway dependency etcd

Compile from source

git clone https://github.com/fagongzi.git
cd $GOPATH/src/github.com/fagongzi/gateway
go build cmd/proxy/proxy.go
go build cmd/admin/admin.go

Download binary file

linux-64bit

Docker

You can run docker pull fagongzi/gateway to get docker images, then use docker run -d fagongzi/gateway to run. It export 3 ports:

• 80

  proxy http serve port

• 8081

  proxy manager port

• 8080

  admin http port

You can read this for more infomation about build and run gateway.

Online Demo

• admin

  http://demo-admin.fagongzi.win admin/admin

• proxy

  http://demo-proxy.fagongzi.win

Architecture

Components

Gateway has three component: proxy, admin, etcd.

Proxy

The proxy provide http server. Proxy is stateless, you can scale proxy node to deal with large traffic.

Admin

The admin is a backend manager system. Admin also is a stateless node, you can use a Nginx node for HA. One Admin node can manager a set of proxy which has a same etcd prefix configuration.

Etcd

The Etcd store gateway's mete data.

Concept of gateway

• Server

  Server is a backend server which provide restfule json service.The server is the basic unit at gateway. more.

• Cluster

  Cluster is a set of servers which provide the same service. The Loadbalancer select a usable server to use. more.

• API

  API is the core concept in gateway. You can define a API with a URL pattern, http method, and at least one dispatch node. more.

• Routing

  Routing is a approach to control http traffic to clusters. You can use cookie, query string, request header infomation in a expression for control.

What gateway can help you

API Definition

You can define restful API based on backend real apis. You can also define a aggregation API use more backend apis.

Validation

You can create some validation rules for api, these rules can validate args of api is correct.

API Mock

You can create a mock API. These API is not depend on backend server api. It can used for front-end developer or default return value that the back-end server does not respond to.

Protect backend server

Gateway can use Traffic Control and Circuit Breaker functions to avoid backend crash by hight triffic.

AB Test

Gateway's Routing fucntion can help your AB Test.

How to extend the gateway

Gateway support plugin mechanism, currently it only support service discovery plugin.

Once gateway proxy started, it scan pluginDir for plugins. In PluginDir, a json file is correspond a external plugin. The json file formart is:

{
    "type": "service-discovery",
    "address": "127.0.0.1:8080"
}

Gateway proxy used http for communicate with plugin. Plugin must implementation this API for Registration:

URL	Method
/plugins/$type	POST