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spring-cloud gateway 自定义滑动窗口限流


import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.Objects;
import java.util.concurrent.TimeUnit;

/**
 * 对某些接口在某个ip下的限流
 * 在验签、鉴权之后执行
 */
@Slf4j
@Component
@AllArgsConstructor
public class RedisRateLimitFilter implements GlobalFilter, Ordered {

    @Autowired
    private RedisTemplate redisTemplate;

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        Integer limit = 2;
        Integer duration = 1;

        String key = exchange.getRequest().getPath().toString();
        Object value = redisTemplate.opsForValue().get(key);
        if (Objects.nonNull(value)&& StringUtils.isNotEmpty(value.toString()) && Integer.parseInt(value.toString()) >= limit) {
            exchange.getResponse().setStatusCode(HttpStatus.TOO_MANY_REQUESTS);
            return exchange.getResponse().setComplete();
        }
        if (Objects.isNull(value) || StringUtils.isEmpty(value.toString())) {
            redisTemplate.opsForValue().set(key,1, duration, TimeUnit.MINUTES);
        }else{
            redisTemplate.opsForValue().increment(key, 1);
            redisTemplate.expire(key, duration, TimeUnit.MINUTES);
        }

        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return -1000;
    }
}

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