package com.jcdm.framework.aspectj;
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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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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.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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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 com.jcdm.common.annotation.RateLimiter;
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import com.jcdm.common.enums.LimitType;
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import com.jcdm.common.exception.ServiceException;
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import com.jcdm.common.utils.StringUtils;
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import com.jcdm.common.utils.ip.IpUtils;
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/**
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* 限流处理
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*
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* @author jc
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*/
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//@Aspect
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//@Component
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public class RateLimiterAspect
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{
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private static final Logger log = LoggerFactory.getLogger(RateLimiterAspect.class);
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private RedisTemplate<Object, Object> redisTemplate;
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private RedisScript<Long> limitScript;
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// @Autowired
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public void setRedisTemplate1(RedisTemplate<Object, Object> redisTemplate)
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{
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this.redisTemplate = redisTemplate;
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}
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// @Autowired
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public void setLimitScript(RedisScript<Long> limitScript)
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{
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this.limitScript = limitScript;
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}
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@Before("@annotation(rateLimiter)")
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public void doBefore(JoinPoint point, RateLimiter rateLimiter) throws Throwable
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{
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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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{
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Long number = redisTemplate.execute(limitScript, keys, count, time);
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if (StringUtils.isNull(number) || number.intValue() > count)
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{
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throw new ServiceException("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(), combineKey);
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}
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catch (ServiceException e)
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{
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throw e;
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}
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catch (Exception e)
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{
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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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{
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StringBuffer stringBuffer = new StringBuffer(rateLimiter.key());
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if (rateLimiter.limitType() == LimitType.IP)
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{
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stringBuffer.append(IpUtils.getIpAddr()).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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