springcloud8-限流+网关集群搭建

一、高级篇幅之高并发情况下接口限流特技

1、nginx层限流
2、网关层限流

简介：谷歌guava框架介绍，网关限流使用

package net.xdclass.apigateway.filter;

import com.google.common.util.concurrent.RateLimiter;
import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.PRE_TYPE;

/**
 * 订单限流
 */
@Component
public class OrderRateLimiterFilter extends ZuulFilter {


    //每秒产生1000个令牌
    private static final RateLimiter RATE_LIMITER = RateLimiter.create(500);

    @Override
    public String filterType() {
        return PRE_TYPE;
    }
　　//限流的过滤器要保证优先级最高
    @Override
    public int filterOrder() {
        return -4;
    }



    @Override
    public boolean shouldFilter() {


        RequestContext requestContext = RequestContext.getCurrentContext();
        HttpServletRequest request = requestContext.getRequest();

        //只对订单接口限流
        if ("/apigateway/order/api/v1/order/save".equalsIgnoreCase(request.getRequestURI())){
            return true;
        }

        return false;
    }

    @Override
    public Object run() throws ZuulException {
        RequestContext requestContext = RequestContext.getCurrentContext();
        if(!RATE_LIMITER.tryAcquire()){
            requestContext.setSendZuulResponse(false);
            requestContext.setResponseStatusCode(HttpStatus.TOO_MANY_REQUESTS.value());
        }
        return null;
    }



}