腾讯微服务平台TSF学习笔记（二）--如何使用spring cloud zuul实现线上流量复制

需求提了n遍了，好好好，那这个需求就由我测试来做

1.在zuul端配置：
●假设provider-mirror是provider-demo的灰度应用

package com.tencent.tsf.msgw.zuul1.filter;import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.web.client.RestTemplate;import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;import org.slf4j.Logger;public class TrafficCopyFilter extends ZuulFilter {private static final Logger LOG = LoggerFactory.getLogger(TrafficCopyFilter.class);private RestTemplate restTemplate = new RestTemplate();@Overridepublic String filterType() {return "pre";}@Overridepublic int filterOrder() {return 1;}@Overridepublic boolean shouldFilter() {return true;}@Overridepublic Object run() {RequestContext ctx = RequestContext.getCurrentContext();HttpServletRequest request = ctx.getRequest();// 检查请求是否是发送给服务A的if (request.getRequestURI().contains("/provider-demo")) {LOG.info("复制请求到mirror服务");// 将请求复制到服务BString param = request.getRequestURI().substring(request.getRequestURI().lastIndexOf("/") + 1); // 提取参数String bServiceUrl = "http://svcb host ip:port/echo/" + param; //这里写mirror服务的镜像地址，后期可从配置文件中读入HttpMethod method = HttpMethod.valueOf(request.getMethod());HttpHeaders headers = new HttpHeaders();Enumeration<String> headerNames = request.getHeaderNames();while (headerNames.hasMoreElements()) {String headerName = headerNames.nextElement();headers.add(headerName, request.getHeader(headerName));}HttpEntity<String> entity = new HttpEntity<>(headers);try {restTemplate.exchange(bServiceUrl, method, entity, Void.class);} catch (Exception e) {// 捕获异常，避免影响客户端LOG.error("复制请求到mirror服务失败: {}", e.getMessage());}}return null;}
}

配置类

package com.tencent.tsf.msgw.zuul1.filter;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;@Configuration
public class ZuulConfig {@Beanpublic TrafficCopyFilter trafficCopyFilter() {return new TrafficCopyFilter();}
}

最后，我们会发现，通过zuul请求provider时，流量会被复制到provider-mirror