PHP actual combat kong to do microservice architecture four (plug-in gateway current limit)

Preface

In order to manage part of the unified business in the process of multi-project management, such as authentication, current limiting, authority, fuse, protocol conversion, unified error code, cache, log, monitoring, alarm, etc.

In this case, we need to find a unified project entrance to set up these services. This unified entrance is the kong gateway introduced in this series of articles.

This article will mainly introduce how to use kong to achieve current limiting.

When writing this article, because Kong is still version 0.13.1, it is embarrassing~~ This article will focus on this version.

kong plugin introduction

The plug-in provides to extend the use of Kong gateway, we can add new functions to the gateway. Plug-ins can be configured to run in various contexts, from specific routing to all services. Plug-ins can provide us with convenient services, such as authentication, rate limiting, or conversion of proxy requests.

Limiting

Plug-in name used: rate-limitingorrate-limiting-advanced

Compared with the old version rate-limiting, the new version rate-limiting-advancedsupports http httpsadditional support on the basis of supportgrpc grpcs

Restriction strategy

This is an optional configuration config.policywith three values:

1. local: The counter is stored on the node in local memory.
2. cluster: The counter is stored in the data storage area of ​​Kong [I am PostgreSQL here] and is shared between nodes. (Defaults)
3. redis: The counter is stored on the Redis server and shared between nodes.

Scope of application

This plug-in can be added to services, routes, and consumers. If no one is specified, it will be a global plug-in and will take effect on every request.

Source code

<?php 
/**
 * 注册服务
 * @author： 飘逸的罗伯特
 */

//api注册
$api_data = [
	'name' => 'goods8',
	'uris' => '/goods8',
	'methods' => 'GET',
	'upstream_url' => 'http://hz12.cn/goods8'
];
var_dump(http_request('http://hz12.cn:8001/apis', $api_data));

//限流设置及注册
$limit = [
	'name' => 'rate-limiting',
	'config.second' => 2,  //每秒钟允许2次
	'config.minute' => 3,  //每分钟允许3次
	//config.hour
    //config.day
    //config.month
    //config.year
];
var_dump(http_request('http://hz12.cn:8001/apis/goods8/plugins', $limit));

/**
 * 发送post请求
 * @param  [string] $url      请求地址
 * @param  [array]  $postdata post参数
 * @return [ar]           [description]
 */
function http_request($url, $postdata=[]){
    
    
	$curl = curl_init();

	curl_setopt($curl, CURLOPT_URL, $url);
	curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($curl, CURLOPT_POST, 1);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $postdata);

	$data = curl_exec($curl);
	curl_close($curl);

	return $data;
}

Run example

1. Register current limiting plugin
   
2. Run the registered api
   
3. Continue to refresh quickly