package com.blueskykong.gateway.enhanced.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 keets * @data 2018/5/19. */ @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) { String ip = exchange.getRequest().getRemoteAddress().getAddress().getHostAddress(); Bucket bucket = CACHE.computeIfAbsent(ip, k -> createNewBucket()); log.debug("IP: " + ip + "ļ¼TokenBucket 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; } }