package com.kidgrow.common.interceptor;
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import feign.RequestInterceptor;
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import feign.RequestTemplate;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.web.context.request.RequestContextHolder;
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import org.springframework.web.context.request.ServletRequestAttributes;
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import javax.servlet.http.HttpServletRequest;
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import java.util.*;
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/**
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* 石家庄喜高科技有限责任公司 版权所有 © Copyright 2020<br>
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*
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* @Description: 微服务之间feign调用请求头丢失的问题，加入微服务之间传递的唯一标识,便于追踪<br>
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* @Project: <br>
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* @CreateDate: Created in 2020/2/4 14:26 <br>
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* @Author: <a href="4345453@kidgrow.com">liuke</a>
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*/
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@Slf4j
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public class FeignRequestInterceptor implements RequestInterceptor {
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/**
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* 微服务之间传递的唯一标识
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*/
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public static final String X_REQUEST_ID = "X-Request-Id";
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@Override
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public void apply(RequestTemplate template) {
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HttpServletRequest httpServletRequest = getHttpServletRequest();
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if(httpServletRequest!=null){
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Map<String, String> headers = getHeaders(httpServletRequest);
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// 传递所有请求头,防止部分丢失
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Iterator<Map.Entry<String, String>> iterator = headers.entrySet().iterator();
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while (iterator.hasNext()) {
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Map.Entry<String, String> entry = iterator.next();
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template.header(entry.getKey(), entry.getValue());
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}
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// 微服务之间传递的唯一标识
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if (httpServletRequest.getHeader(X_REQUEST_ID)==null) {
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String sid = String.valueOf(UUID.randomUUID());
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template.header(X_REQUEST_ID, sid);
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}
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log.debug("FeignRequestInterceptor:{}", template.toString());
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}
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}
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private HttpServletRequest getHttpServletRequest() {
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try {
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return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
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} catch (Exception e) {
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return null;
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}
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}
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private Map<String, String> getHeaders(HttpServletRequest request) {
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Map<String, String> map = new LinkedHashMap<>();
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Enumeration<String> enumeration = request.getHeaderNames();
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if(enumeration!=null){
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while (enumeration.hasMoreElements()) {
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String key = enumeration.nextElement();
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String value = request.getHeader(key);
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map.put(key, value);
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}
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}
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return map;
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}
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}
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