xjs
3 years ago
parent
0e994a168c
commit
0914ee4f37
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package com.xjs.annotation;
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import com.xjs.enums.InterfaceLimitType;
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import java.lang.annotation.*;
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/**
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* 接口限流注解
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* @author xiejs
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* @since 2022-05-16
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*/
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@Target(ElementType.METHOD)
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@Retention(RetentionPolicy.RUNTIME)
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@Documented
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public @interface RateLimiter {
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/**
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* 限流key
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*/
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String key() default "rate_limit:";
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/**
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* 限流时间,单位秒
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*/
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int time() default 60;
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/**
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* 限流次数
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*/
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int count() default 100;
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/**
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* 限流类型
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*/
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InterfaceLimitType limitType() default InterfaceLimitType.DEFAULT;
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}
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package com.xjs.aop;
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import com.ruoyi.common.core.utils.ip.IpUtils;
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import com.xjs.annotation.RateLimiter;
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import com.xjs.enums.InterfaceLimitType;
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import com.xjs.exception.BusinessException;
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import lombok.extern.log4j.Log4j2;
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import org.aspectj.lang.JoinPoint;
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import org.aspectj.lang.annotation.Aspect;
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import org.aspectj.lang.annotation.Before;
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import org.aspectj.lang.reflect.MethodSignature;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.data.redis.core.RedisTemplate;
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import org.springframework.data.redis.core.script.RedisScript;
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import org.springframework.stereotype.Component;
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import org.springframework.web.context.request.RequestContextHolder;
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import org.springframework.web.context.request.ServletRequestAttributes;
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import java.lang.reflect.Method;
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import java.util.Collections;
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import java.util.List;
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/**
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* 接口限流aop
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* @author xiejs
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* @since 2022-05-16
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*/
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@Aspect
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@Component
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@Log4j2
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public class RateLimiterAspect {
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@Autowired
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private RedisTemplate<Object, Object> redisTemplate;
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@Autowired
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private RedisScript<Long> limitScript;
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@Before("@annotation(rateLimiter)")
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public void doBefore(JoinPoint point, RateLimiter rateLimiter) throws Throwable {
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String key = rateLimiter.key();
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int time = rateLimiter.time();
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int count = rateLimiter.count();
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String combineKey = getCombineKey(rateLimiter, point);
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List<Object> keys = Collections.singletonList(combineKey);
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try {
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Long number = redisTemplate.execute(limitScript, keys, count, time);
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if (number==null || number.intValue() > count) {
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throw new BusinessException("访问过于频繁，请稍候再试");
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}
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log.info("限制请求'{}',当前请求'{}',缓存key'{}'", count, number.intValue(), key);
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} catch (BusinessException e) {
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throw e;
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} catch (Exception e) {
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throw new RuntimeException("服务器限流异常，请稍候再试");
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}
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}
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public String getCombineKey(RateLimiter rateLimiter, JoinPoint point) {
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StringBuilder stringBuffer = new StringBuilder(rateLimiter.key());
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if (rateLimiter.limitType() == InterfaceLimitType.IP) {
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stringBuffer.append(IpUtils.getIpAddr(((ServletRequestAttributes) RequestContextHolder.currentRequestAttributes()).getRequest())).append("-");
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}
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MethodSignature signature = (MethodSignature) point.getSignature();
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Method method = signature.getMethod();
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Class<?> targetClass = method.getDeclaringClass();
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stringBuffer.append(targetClass.getName()).append("-").append(method.getName());
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return stringBuffer.toString();
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}
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}
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@ -0,0 +1,18 @@
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package com.xjs.enums;
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/**
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* 接口限流类别枚举类
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* @author xiejs
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* @since 2022-05-16
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*/
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public enum InterfaceLimitType {
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/**
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* 默认策略全局限流
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*/
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DEFAULT,
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/**
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* 根据请求者IP进行限流
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*/
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IP
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}
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@ -0,0 +1,23 @@
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package com.xjs.script;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.core.io.ClassPathResource;
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import org.springframework.data.redis.core.script.DefaultRedisScript;
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import org.springframework.scripting.support.ResourceScriptSource;
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/**
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* redis 脚本执行
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* @author xiejs
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* @since 2022-05-16
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*/
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@Configuration
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public class RedisScript {
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@Bean
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public DefaultRedisScript<Long> limitScript() {
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DefaultRedisScript<Long> redisScript = new DefaultRedisScript<>();
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redisScript.setScriptSource(new ResourceScriptSource(new ClassPathResource("lua/limit.lua")));
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redisScript.setResultType(Long.class);
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return redisScript;
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}
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}
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@ -0,0 +1,12 @@
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local key = KEYS[1]
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local count = tonumber(ARGV[1])
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local time = tonumber(ARGV[2])
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local current = redis.call('get', key)
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if current and tonumber(current) > count then
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return tonumber(current)
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end
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current = redis.call('incr', key)
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if tonumber(current) == 1 then
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redis.call('expire', key, time)
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end
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return tonumber(current)
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