package com.nuvole.rateLimit;
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import com.alibaba.fastjson.JSONObject;
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import com.google.common.collect.Maps;
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import com.google.common.util.concurrent.RateLimiter;
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import com.nuvole.common.domain.emnu.CommonResultEmnu;
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import com.nuvole.common.domain.result.CommonResult;
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import jakarta.servlet.http.HttpServletResponse;
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import lombok.extern.slf4j.Slf4j;
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import org.aspectj.lang.ProceedingJoinPoint;
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import org.aspectj.lang.annotation.Around;
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import org.aspectj.lang.annotation.Aspect;
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import org.aspectj.lang.reflect.MethodSignature;
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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.io.IOException;
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import java.io.PrintWriter;
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import java.lang.reflect.Method;
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import java.util.Map;
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@Slf4j
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@Aspect
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@Component
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public class ApiRateLimitAop {
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/**
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* 不同的接口，不同的流量控制
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* map的key为 Limiter.key
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*/
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private final Map<String, RateLimiter> limitMap = Maps.newConcurrentMap();
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@Around("@annotation(com.nuvole.rateLimit.ApiRateLimit)")
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public Object around(ProceedingJoinPoint joinPoint) throws Throwable {
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MethodSignature signature = (MethodSignature) joinPoint.getSignature();
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Method method = signature.getMethod();
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//拿limit的注解
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ApiRateLimit limit = method.getAnnotation(ApiRateLimit.class);
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if (limit != null) {
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//key作用：不同的接口，不同的流量控制
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String key = limit.key();
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RateLimiter rateLimiter = null;
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//验证缓存是否有命中key
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if (!limitMap.containsKey(key)) {
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// 创建令牌桶
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rateLimiter = RateLimiter.create(limit.permitsPerSecond());
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limitMap.put(key, rateLimiter);
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log.info("新建了令牌桶={}，容量={}", key, limit.permitsPerSecond());
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}
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rateLimiter = limitMap.get(key);
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// 拿令牌
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boolean acquire = rateLimiter.tryAcquire(limit.timeout(), limit.timeunit());
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// 拿不到命令，直接返回异常提示
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if (!acquire) {
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log.debug("令牌桶={}，获取令牌失败", key);
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this.responseFail(limit.msg());
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return null;
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}
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}
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return joinPoint.proceed();
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}
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/**
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* @param msg 提示信息
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*/
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private void responseFail(String msg) {
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HttpServletResponse response = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getResponse();
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CommonResult resultData = new CommonResult(CommonResultEmnu.REQUEST_LIMIT_ERR, msg);
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response.setContentType("application/json;charset=UTF-8");
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PrintWriter out = null;
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try {
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out = response.getWriter();
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} catch (IOException e) {
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e.printStackTrace();
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}
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out.print(JSONObject.toJSONString(resultData));
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out.flush();
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out.close();
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}
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}
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