support spring-retry router (#633)
lepdou
2 years ago
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62d7f9c448
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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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package com.tencent.cloud.polaris.router.resttemplate;
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import java.io.IOException;
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import java.io.UnsupportedEncodingException;
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import java.net.URI;
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import java.net.URLEncoder;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import com.tencent.cloud.common.constant.RouterConstants;
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import com.tencent.cloud.common.metadata.MetadataContext;
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import com.tencent.cloud.common.metadata.MetadataContextHolder;
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import com.tencent.cloud.common.metadata.StaticMetadataManager;
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import com.tencent.cloud.common.util.JacksonUtils;
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import com.tencent.cloud.common.util.expresstion.SpringWebExpressionLabelUtils;
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import com.tencent.cloud.polaris.router.RouterRuleLabelResolver;
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import com.tencent.cloud.polaris.router.spi.SpringWebRouterLabelResolver;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.core.Ordered;
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import org.springframework.http.HttpRequest;
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import org.springframework.http.client.ClientHttpRequestExecution;
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import org.springframework.http.client.ClientHttpRequestInterceptor;
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import org.springframework.http.client.ClientHttpResponse;
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import org.springframework.lang.NonNull;
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import org.springframework.util.Assert;
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import org.springframework.util.CollectionUtils;
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import static com.tencent.cloud.common.constant.ContextConstant.UTF_8;
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/**
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* Interceptor used for adding the route label in http headers from context when web client
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* is RestTemplate.
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*
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* @author liuye 2022-09-14
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*/
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public class RouterLabelRestTemplateInterceptor implements ClientHttpRequestInterceptor, Ordered {
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private static final Logger LOGGER = LoggerFactory.getLogger(RouterLabelRestTemplateInterceptor.class);
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private final List<SpringWebRouterLabelResolver> routerLabelResolvers;
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private final StaticMetadataManager staticMetadataManager;
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private final RouterRuleLabelResolver routerRuleLabelResolver;
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public RouterLabelRestTemplateInterceptor(List<SpringWebRouterLabelResolver> routerLabelResolvers,
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StaticMetadataManager staticMetadataManager,
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RouterRuleLabelResolver routerRuleLabelResolver) {
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this.staticMetadataManager = staticMetadataManager;
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this.routerRuleLabelResolver = routerRuleLabelResolver;
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if (!CollectionUtils.isEmpty(routerLabelResolvers)) {
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routerLabelResolvers.sort(Comparator.comparingInt(Ordered::getOrder));
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this.routerLabelResolvers = routerLabelResolvers;
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}
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else {
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this.routerLabelResolvers = null;
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}
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}
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@Override
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public int getOrder() {
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return Ordered.LOWEST_PRECEDENCE;
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}
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@Override
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public ClientHttpResponse intercept(@NonNull HttpRequest request, @NonNull byte[] body,
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@NonNull ClientHttpRequestExecution clientHttpRequestExecution) throws IOException {
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final URI originalUri = request.getURI();
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String peerServiceName = originalUri.getHost();
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Assert.state(peerServiceName != null,
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"Request URI does not contain a valid hostname: " + originalUri);
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setLabelsToHeaders(request, body, peerServiceName);
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return clientHttpRequestExecution.execute(request, body);
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}
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void setLabelsToHeaders(HttpRequest request, byte[] body, String peerServiceName) {
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// local service labels
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Map<String, String> labels = new HashMap<>(staticMetadataManager.getMergedStaticMetadata());
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// labels from rule expression
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Set<String> expressionLabelKeys = routerRuleLabelResolver.getExpressionLabelKeys(MetadataContext.LOCAL_NAMESPACE,
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MetadataContext.LOCAL_SERVICE, peerServiceName);
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Map<String, String> ruleExpressionLabels = getExpressionLabels(request, expressionLabelKeys);
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if (!CollectionUtils.isEmpty(ruleExpressionLabels)) {
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labels.putAll(ruleExpressionLabels);
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}
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// labels from request
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if (!CollectionUtils.isEmpty(routerLabelResolvers)) {
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routerLabelResolvers.forEach(resolver -> {
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try {
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Map<String, String> customResolvedLabels = resolver.resolve(request, body, expressionLabelKeys);
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if (!CollectionUtils.isEmpty(customResolvedLabels)) {
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labels.putAll(customResolvedLabels);
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}
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}
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catch (Throwable t) {
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LOGGER.error("[SCT][Router] revoke RouterLabelResolver occur some exception. ", t);
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}
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});
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}
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// labels from downstream
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Map<String, String> transitiveLabels = MetadataContextHolder.get()
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.getFragmentContext(MetadataContext.FRAGMENT_TRANSITIVE);
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labels.putAll(transitiveLabels);
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// pass label by header
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String encodedLabelsContent;
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try {
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encodedLabelsContent = URLEncoder.encode(JacksonUtils.serialize2Json(labels), UTF_8);
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}
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catch (UnsupportedEncodingException e) {
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throw new RuntimeException("unsupported charset exception " + UTF_8);
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}
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request.getHeaders().set(RouterConstants.ROUTER_LABEL_HEADER, encodedLabelsContent);
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}
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private Map<String, String> getExpressionLabels(HttpRequest request, Set<String> labelKeys) {
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if (CollectionUtils.isEmpty(labelKeys)) {
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return Collections.emptyMap();
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}
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return SpringWebExpressionLabelUtils.resolve(request, labelKeys);
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}
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}
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