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RateLimitByIpGatewayFilter.java
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RateLimitByIpGatewayFilter.java
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package com.windmt.filter;
import io.github.bucket4j.Bandwidth;
import io.github.bucket4j.Bucket;
import io.github.bucket4j.Bucket4j;
import io.github.bucket4j.Refill;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.extern.apachecommons.CommonsLog;
import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
import java.time.Duration;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* @author: yibo
**/
@CommonsLog
@Builder
@Data
@AllArgsConstructor
@NoArgsConstructor
public class RateLimitByIpGatewayFilter implements GatewayFilter, Ordered {
int capacity;
int refillTokens;
Duration refillDuration;
private static final Map<String, Bucket> CACHE = new ConcurrentHashMap<>();
private Bucket createNewBucket() {
Refill refill = Refill.of(refillTokens, refillDuration);
Bandwidth limit = Bandwidth.classic(capacity, refill);
return Bucket4j.builder().addLimit(limit).build();
}
@Override
public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
// if (!enableRateLimit){
// return chain.filter(exchange);
// }
String ip = exchange.getRequest().getRemoteAddress().getAddress().getHostAddress();
Bucket bucket = CACHE.computeIfAbsent(ip, k -> createNewBucket());
log.debug("IP: " + ip + ", TokenBucket Available Tokens: " + bucket.getAvailableTokens());
if (bucket.tryConsume(1)) {
return chain.filter(exchange);
} else {
exchange.getResponse().setStatusCode(HttpStatus.TOO_MANY_REQUESTS);
return exchange.getResponse().setComplete();
}
}
@Override
public int getOrder() {
return -1000;
}
}