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/*
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* Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
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*
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* Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
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*
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* Licensed under the BSD 3-Clause License (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://opensource.org/licenses/BSD-3-Clause
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*
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* Unless required by applicable law or agreed to in writing, software distributed
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* under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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* CONDITIONS OF ANY KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations under the License.
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*
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*/
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package com.tencent.cloud.polaris.gateway.core.scg.filter;
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import com.tencent.cloud.metadata.constant.MetadataConstant;
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import com.tencent.cloud.metadata.context.MetadataContext;
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import com.tencent.cloud.polaris.ratelimit.utils.Consts;
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import com.tencent.cloud.polaris.ratelimit.utils.QuotaCheckUtils;
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import com.tencent.polaris.ratelimit.api.core.LimitAPI;
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import com.tencent.polaris.ratelimit.api.rpc.QuotaResponse;
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import com.tencent.polaris.ratelimit.api.rpc.QuotaResultCode;
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import org.apache.commons.lang.StringUtils;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.cloud.gateway.filter.GatewayFilterChain;
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import org.springframework.core.io.buffer.DataBuffer;
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import org.springframework.http.HttpStatus;
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import org.springframework.http.MediaType;
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import org.springframework.http.server.reactive.ServerHttpResponse;
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import org.springframework.web.server.ServerWebExchange;
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import reactor.core.publisher.Mono;
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import java.nio.charset.StandardCharsets;
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import java.util.HashMap;
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import java.util.Map;
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import static com.tencent.cloud.polaris.gateway.core.scg.filter.MetadataFirstScgFilter.METADATA_FIRST_FILTER_ORDER;
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/**
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* Scg filter used for writing metadata in HTTP request header.
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*
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* @author Haotian Zhang
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*/
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public class RateLimitScgFilter extends AbstractGlobalFilter {
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private static final Logger LOG = LoggerFactory.getLogger(RateLimitScgFilter.class);
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public static final int RATE_LIMIT_SCG_FILTER_ORDER = METADATA_FIRST_FILTER_ORDER + 1;
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@Autowired(required = false)
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private LimitAPI limitAPI;
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@Override
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public int getOrder() {
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return RATE_LIMIT_SCG_FILTER_ORDER;
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}
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@Override
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public boolean shouldFilter(ServerWebExchange exchange, GatewayFilterChain chain) {
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return limitAPI != null;
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}
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@Override
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public Mono<Void> doFilter(ServerWebExchange exchange, GatewayFilterChain chain) {
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// get metadata of current thread
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MetadataContext metadataContext = exchange.getAttribute(MetadataConstant.HeaderName.METADATA_CONTEXT);
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String peerNamespace = metadataContext.getSystemMetadata(MetadataConstant.SystemMetadataKey.PEER_NAMESPACE);
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String peerService = metadataContext.getSystemMetadata(MetadataConstant.SystemMetadataKey.PEER_SERVICE);
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String peerPath = metadataContext.getSystemMetadata(MetadataConstant.SystemMetadataKey.PEER_PATH);
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Map<String, String> labels = null;
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if (StringUtils.isNotBlank(peerPath)) {
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labels = new HashMap<>();
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labels.put("method", peerPath);
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}
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try {
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QuotaResponse quotaResponse = QuotaCheckUtils.getQuota(limitAPI, peerNamespace, peerService, 1, labels,
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null);
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if (quotaResponse.getCode() == QuotaResultCode.QuotaResultLimited) {
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ServerHttpResponse response = exchange.getResponse();
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response.setStatusCode(HttpStatus.TOO_MANY_REQUESTS);
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response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
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DataBuffer dataBuffer = response.bufferFactory().allocateBuffer()
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.write((Consts.QUOTA_LIMITED_INFO + quotaResponse.getInfo()).getBytes(StandardCharsets.UTF_8));
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return response.writeWith(Mono.just(dataBuffer));
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}
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} catch (Throwable throwable) {
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//限流API调用出现异常，不应该影响业务流程的调用
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LOG.error("fail to rate limit with QuotaRequest[{}-{}-{}].", peerNamespace, peerService, peerPath,
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throwable);
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}
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return chain.filter(exchange);
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}
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}
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SkyeBeFreeman
3 years ago