支持自定义注解实现接口限流

ruoyi-framework/src/main/java/com/ruoyi/framework/aspectj/RateLimiterAspect.java

@@ -0,0 +1,116 @@
+package com.ruoyi.framework.aspectj;
+
+import java.lang.reflect.Method;
+import java.util.Collections;
+import java.util.List;
+import org.aspectj.lang.JoinPoint;
+import org.aspectj.lang.Signature;
+import org.aspectj.lang.annotation.Aspect;
+import org.aspectj.lang.annotation.Before;
+import org.aspectj.lang.annotation.Pointcut;
+import org.aspectj.lang.reflect.MethodSignature;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.data.redis.core.script.RedisScript;
+import org.springframework.stereotype.Component;
+import com.ruoyi.common.annotation.RateLimiter;
+import com.ruoyi.common.enums.LimitType;
+import com.ruoyi.common.exception.ServiceException;
+import com.ruoyi.common.utils.ServletUtils;
+import com.ruoyi.common.utils.StringUtils;
+import com.ruoyi.common.utils.ip.IpUtils;
+
+/**
+ * 限流处理
+ *
+ * @author ruoyi
+ */
+@Aspect
+@Component
+public class RateLimiterAspect
+{
+    private static final Logger log = LoggerFactory.getLogger(RateLimiterAspect.class);
+
+    private RedisTemplate<Object, Object> redisTemplate;
+
+    private RedisScript<Long> limitScript;
+
+    @Autowired
+    public void setRedisTemplate1(RedisTemplate<Object, Object> redisTemplate)
+    {
+        this.redisTemplate = redisTemplate;
+    }
+
+    @Autowired
+    public void setLimitScript(RedisScript<Long> limitScript)
+    {
+        this.limitScript = limitScript;
+    }
+
+    // 配置织入点
+    @Pointcut("@annotation(com.ruoyi.common.annotation.RateLimiter)")
+    public void rateLimiterPointCut()
+    {
+    }
+
+    @Before("rateLimiterPointCut()")
+    public void doBefore(JoinPoint point) throws Throwable
+    {
+        RateLimiter rateLimiter = getAnnotationRateLimiter(point);
+        String key = rateLimiter.key();
+        int time = rateLimiter.time();
+        int count = rateLimiter.count();
+
+        String combineKey = getCombineKey(rateLimiter, point);
+        List<Object> keys = Collections.singletonList(combineKey);
+        try
+        {
+            Long number = redisTemplate.execute(limitScript, keys, count, time);
+            if (StringUtils.isNull(number) || number.intValue() > count)
+            {
+                throw new ServiceException("访问过于频繁，请稍后再试");
+            }
+            log.info("限制请求'{}',当前请求'{}',缓存key'{}'", count, number.intValue(), key);
+        }
+        catch (ServiceException e)
+        {
+            throw e;
+        }
+        catch (Exception e)
+        {
+            throw new RuntimeException("服务器限流异常，请稍后再试");
+        }
+    }
+
+    /**
+     * 是否存在注解，如果存在就获取
+     */
+    private RateLimiter getAnnotationRateLimiter(JoinPoint joinPoint)
+    {
+        Signature signature = joinPoint.getSignature();
+        MethodSignature methodSignature = (MethodSignature) signature;
+        Method method = methodSignature.getMethod();
+
+        if (method != null)
+        {
+            return method.getAnnotation(RateLimiter.class);
+        }
+        return null;
+    }
+
+    public String getCombineKey(RateLimiter rateLimiter, JoinPoint point)
+    {
+        StringBuffer stringBuffer = new StringBuffer(rateLimiter.key());
+        if (rateLimiter.limitType() == LimitType.IP)
+        {
+            stringBuffer.append(IpUtils.getIpAddr(ServletUtils.getRequest()));
+        }
+        MethodSignature signature = (MethodSignature) point.getSignature();
+        Method method = signature.getMethod();
+        Class<?> targetClass = method.getDeclaringClass();
+        stringBuffer.append("-").append(targetClass.getName()).append("- ").append(method.getName());
+        return stringBuffer.toString();
+    }
+}

ruoyi-framework/src/main/java/com/ruoyi/framework/config/RedisConfig.java

@@ -6,6 +6,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.data.redis.connection.RedisConnectionFactory;
 import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.data.redis.core.script.DefaultRedisScript;
 import org.springframework.data.redis.serializer.StringRedisSerializer;
 import com.fasterxml.jackson.annotation.JsonAutoDetect;
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
@@ -47,4 +48,32 @@ public class RedisConfig extends CachingConfigurerSupport
         template.afterPropertiesSet();
         return template;
     }
+
+    @Bean
+    public DefaultRedisScript<Long> limitScript()
+    {
+        DefaultRedisScript<Long> redisScript = new DefaultRedisScript<>();
+        redisScript.setScriptText(limitScriptText());
+        redisScript.setResultType(Long.class);
+        return redisScript;
+    }
+
+    /**
+     * 限流脚本
+     */
+    private String limitScriptText()
+    {
+        return "local key = KEYS[1]\n" +
+                "local count = tonumber(ARGV[1])\n" +
+                "local time = tonumber(ARGV[2])\n" +
+                "local current = redis.call('get', key);\n" +
+                "if current and tonumber(current) > count then\n" +
+                "    return current;\n" +
+                "end\n" +
+                "current = redis.call('incr', key)\n" +
+                "if tonumber(current) == 1 then\n" +
+                "    redis.call('expire', key, time)\n" +
+                "end\n" +
+                "return current;";
+    }
 }