使用google的guova开发高并发下的接口限流

Posted 2021-02-13 programer-xinmu78

使用google的guova开发高并发下的接口限流

使用google的guova进行限流

1、guova的限流方式，在定时产生定量的令牌，令牌的数量限制了流量

2、增加一个订单接口限流类OrderRateFilter,继承ZuulFilter，并重载方法；filterType、filterOrder、shouldFilter、run

????filterType中return PRE_TYPE;

????fileterOrder中应该优先级最高，设为-4

????shouldFilter中设置限流的方法（类似于鉴权）

???? RequestContext requestContext= RequestContext.getCurrentContext();

HttpServletRequest httpServletRequest=requestContext.getRequest();

//System.out.println(httpServletRequest.getRequestURI());///apigateway/order/api/v1/orderfeignhystrix/save

//System.out.println(httpServletRequest.getRequestURL());//http://192.168.136.128:9000/apigateway/order/api/v1/orderfeignhystrix/save

?

if ("/apigateway/order/api/v1/orderfeignhystrix/save".equalsIgnoreCase(httpServletRequest.getRequestURI()))

{

return true;

}

????run中设置 ，获取令牌

????guava中需要增加令牌设置

????//每秒1000个令牌

????private static final RateLimiter RATE_LIMITER=RateLimiter.create(1000);

????

????在run中增加RATELIMITER.tryActquire();

????????如果未取到这返回过多的访问

???????? ?

???????? ?

if (!RATE_LIMITER.tryAcquire())

{

RequestContext requestContext=RequestContext.getCurrentContext();

requestContext.setSendZuulResponse(false);

requestContext.setResponseStatusCode(HttpStatus.TOO_MANY_REQUESTS.value());

}