net.dreamlu.mica.redis.ratelimiter.RedisRateLimiterAspect Maven / Gradle / Ivy
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/*
* Copyright (c) 2019-2029, Dreamlu 卢春梦 ([email protected] & www.dreamlu.net).
*
* Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0;
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.gnu.org/licenses/lgpl.html
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.dreamlu.mica.redis.ratelimiter;
import lombok.RequiredArgsConstructor;
import net.dreamlu.mica.core.spel.MicaExpressionEvaluator;
import net.dreamlu.mica.core.utils.CharPool;
import net.dreamlu.mica.core.utils.StringUtil;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.expression.AnnotatedElementKey;
import org.springframework.expression.EvaluationContext;
import org.springframework.lang.NonNull;
import org.springframework.util.Assert;
import java.lang.reflect.Method;
import java.util.concurrent.TimeUnit;
/**
* redis 限流
*
* @author L.cm
*/
@Aspect
@RequiredArgsConstructor
public class RedisRateLimiterAspect implements ApplicationContextAware {
/**
* 表达式处理
*/
private final MicaExpressionEvaluator evaluator = new MicaExpressionEvaluator();
/**
* redis 限流服务
*/
private final RedisRateLimiterClient rateLimiterClient;
private ApplicationContext applicationContext;
/**
* AOP 环切 注解 @RateLimiter
*/
@Around("@annotation(limiter)")
public Object aroundRateLimiter(ProceedingJoinPoint point, RateLimiter limiter) throws Throwable {
String limitKey = limiter.value();
Assert.hasText(limitKey, "@RateLimiter value must have length; it must not be null or empty");
// el 表达式
String limitParam = limiter.param();
// 表达式不为空
String rateKey;
if (StringUtil.isNotBlank(limitParam)) {
String evalAsText = evalLimitParam(point, limitParam);
rateKey = limitKey + CharPool.COLON + evalAsText;
} else {
rateKey = limitKey;
}
long max = limiter.max();
long ttl = limiter.ttl();
TimeUnit timeUnit = limiter.timeUnit();
return rateLimiterClient.allow(rateKey, max, ttl, timeUnit, point::proceed);
}
/**
* 计算参数表达式
*
* @param point ProceedingJoinPoint
* @param limitParam limitParam
* @return 结果
*/
private String evalLimitParam(ProceedingJoinPoint point, String limitParam) {
MethodSignature ms = (MethodSignature) point.getSignature();
Method method = ms.getMethod();
Object[] args = point.getArgs();
Object target = point.getTarget();
Class targetClass = target.getClass();
EvaluationContext context = evaluator.createContext(method, args, target, targetClass, applicationContext);
AnnotatedElementKey elementKey = new AnnotatedElementKey(method, targetClass);
return evaluator.evalAsText(limitParam, elementKey, context);
}
@Override
public void setApplicationContext(@NonNull ApplicationContext applicationContext) throws BeansException {
this.applicationContext = applicationContext;
}
}