解決微服務feign調(diào)用添加token的問題

更新時間：2021年06月30日 10:21:37 作者：synda@hzy

這篇文章主要介紹了解決微服務feign調(diào)用添加token的問題，具有很好的參考價值，希望對大家有所幫助。如有錯誤或未考慮完全的地方，望不吝賜教

微服務feign調(diào)用添加token

1.一般情況是這么配置的

具體的怎么調(diào)用就不說了如下配置，就可以在請求頭中添加需要的請求頭信息。

package localdate;
import feign.RequestInterceptor;
import feign.RequestTemplate;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;
/**
 * feign調(diào)用服務時，會丟失請求頭信息。需要在這里把認證信息收到添加上去
 * @author TRON
 * @since  2019-11-23
 *
 *
 */
@Configuration
@Slf4j
public class FeignTokenInterceptor implements RequestInterceptor {
    @Override
    public void apply(RequestTemplate requestTemplate) {
        log.info("======上下文中獲取原請求信息======");
        String token = "without token";
        HttpServletRequest request = ((ServletRequestAttributes)
                RequestContextHolder.getRequestAttributes()).getRequest();
        Enumeration<String> headerNames = request.getHeaderNames();
        while (headerNames.hasMoreElements()) {
            String headerName = headerNames.nextElement();
            String HeadValue = request.getHeader(headerName);
            log.info("===原請求頭信息=== headName: {}, headValue: {}", headerName, HeadValue);
            if (headerName.equals("X-Authorization-access_token")||headerName.equals("x-authorization-access_token")) {
                token = HeadValue;
            }
        }
        log.info("=======Feign添加頭部信息start======");
//        requestTemplate.header("X-Authorization-access_token", token);
        requestTemplate.header("X-Authorization-access_token", "tron123456");
        log.info("=======Feign添加頭部信息end======");
    }
}

2 .但是，當熔斷開啟后，原先的這么配置就不起作用了

package localdate;
import com.netflix.hystrix.HystrixThreadPoolKey;
import com.netflix.hystrix.strategy.HystrixPlugins;
import com.netflix.hystrix.strategy.concurrency.HystrixConcurrencyStrategy;
import com.netflix.hystrix.strategy.concurrency.HystrixRequestVariable;
import com.netflix.hystrix.strategy.concurrency.HystrixRequestVariableLifecycle;
import com.netflix.hystrix.strategy.eventnotifier.HystrixEventNotifier;
import com.netflix.hystrix.strategy.executionhook.HystrixCommandExecutionHook;
import com.netflix.hystrix.strategy.metrics.HystrixMetricsPublisher;
import com.netflix.hystrix.strategy.properties.HystrixPropertiesStrategy;
import com.netflix.hystrix.strategy.properties.HystrixProperty;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Callable;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
/**
 * 自定義并發(fā)策略
 * 將現(xiàn)有的并發(fā)策略作為新并發(fā)策略的成員變量
 * 在新并發(fā)策略中，返回現(xiàn)有并發(fā)策略的線程池、Queue
 *
 * hystrix.command.default.execution.isolation.strategy=THREAD
 * Hystrix的默認隔離策略（官方推薦，當使用該隔離策略時，是沒辦法拿到 ThreadLocal 中的值的，但是RequestContextHolder 源碼中，使用了兩個ThreadLocal）
 * hystrix.command.default.execution.isolation.strategy=SEMAPHORE （將隔離策略改為SEMAPHORE 也可以解決這個問題，但是官方并不推薦這個策略，因為這個策略對網(wǎng)絡資源消耗比較大）
 *
 * 主要是解決當 Hystrix的默認隔離策略是THREAD時，不能通過RequestContextHolder獲取到request對象的問題
 *
 */
//@Configuration
public class FeignConfig extends HystrixConcurrencyStrategy {
    private static final Logger log = LoggerFactory.getLogger(FeignConfig.class);
    private HystrixConcurrencyStrategy delegate;
    public FeignConfig() {
        try {
            this.delegate = HystrixPlugins.getInstance().getConcurrencyStrategy();
            if (this.delegate instanceof FeignConfig) {
                // Welcome to singleton hell...
                return;
            }
            HystrixCommandExecutionHook commandExecutionHook =
                    HystrixPlugins.getInstance().getCommandExecutionHook();
            HystrixEventNotifier eventNotifier = HystrixPlugins.getInstance().getEventNotifier();
            HystrixMetricsPublisher metricsPublisher = HystrixPlugins.getInstance().getMetricsPublisher();
            HystrixPropertiesStrategy propertiesStrategy =
                    HystrixPlugins.getInstance().getPropertiesStrategy();
            this.logCurrentStateOfHystrixPlugins(eventNotifier, metricsPublisher, propertiesStrategy);
            HystrixPlugins.reset();
            HystrixPlugins.getInstance().registerConcurrencyStrategy(this);
            HystrixPlugins.getInstance().registerCommandExecutionHook(commandExecutionHook);
            HystrixPlugins.getInstance().registerEventNotifier(eventNotifier);
            HystrixPlugins.getInstance().registerMetricsPublisher(metricsPublisher);
            HystrixPlugins.getInstance().registerPropertiesStrategy(propertiesStrategy);
        } catch (Exception e) {
            log.error("Failed to register Sleuth Hystrix Concurrency Strategy", e);
        }
    }
    private void logCurrentStateOfHystrixPlugins(HystrixEventNotifier eventNotifier,
                                                 HystrixMetricsPublisher metricsPublisher, HystrixPropertiesStrategy propertiesStrategy) {
        if (log.isDebugEnabled()) {
            log.debug("Current Hystrix plugins configuration is [" + "concurrencyStrategy ["
                    + this.delegate + "]," + "eventNotifier [" + eventNotifier + "]," + "metricPublisher ["
                    + metricsPublisher + "]," + "propertiesStrategy [" + propertiesStrategy + "]," + "]");
            log.debug("Registering Sleuth Hystrix Concurrency Strategy.");
        }
    }
    @Override
    public <T> Callable<T> wrapCallable(Callable<T> callable) {
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
        return new WrappedCallable<>(callable, requestAttributes);
    }
    @Override
    public ThreadPoolExecutor getThreadPool(HystrixThreadPoolKey threadPoolKey,
                                            HystrixProperty<Integer> corePoolSize, HystrixProperty<Integer> maximumPoolSize,
                                            HystrixProperty<Integer> keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue) {
        return this.delegate.getThreadPool(threadPoolKey, corePoolSize, maximumPoolSize, keepAliveTime,
                unit, workQueue);
    }
    @Override
    public BlockingQueue<Runnable> getBlockingQueue(int maxQueueSize) {
        return this.delegate.getBlockingQueue(maxQueueSize);
    }
    @Override
    public <T> HystrixRequestVariable<T> getRequestVariable(HystrixRequestVariableLifecycle<T> rv) {
        return this.delegate.getRequestVariable(rv);
    }
    static class WrappedCallable<T> implements Callable<T> {
        private final Callable<T> target;
        private final RequestAttributes requestAttributes;
        public WrappedCallable(Callable<T> target, RequestAttributes requestAttributes) {
            this.target = target;
            this.requestAttributes = requestAttributes;
        }
        @Override
        public T call() throws Exception {
            try {
                RequestContextHolder.setRequestAttributes(requestAttributes);
                return target.call();
            } finally {
                RequestContextHolder.resetRequestAttributes();
            }
        }
    }
}

3 .feign和熔斷的配置

feign:
  client:
    config:
      default:
        connectTimeout: 5000   #連接超時3秒，連接失敗時直接調(diào)用降級方法
        readTimeout: 100000     #連接成功，處理數(shù)據(jù)的時間限制10秒 100000   讀取時間過短會拋異常java.net.SocketTimeoutException: Read timed out
        loggerLevel: full      #日志輸出等級
  hystrix:
    enabled: true
hystrix:
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 5000  #服務連接成功，但是時間過長，降級方法調(diào)用時間   60000   5000

feign微服務的相互調(diào)用

我只是記錄服務提供方、消費方的代碼編寫，配置什么的大家在網(wǎng)上搜，一大堆。

首先是服務提供方：

啟動類上加上注解@EnableFeignClients，然后正常的寫controller、service等業(yè)務邏輯

其次是服務的調(diào)用方：

1.首先啟動類上加上注解@EnableFeignClients

2.編寫服務調(diào)用接口

3.編寫接口熔斷處理方法

4.本人遇到的問題是需要用到調(diào)用方的請求頭里面的信息，但是在提供方取不到，這時可以通過在調(diào)用方增加配置來解決

import feign.RequestInterceptor;
import feign.RequestTemplate;
import java.util.Enumeration;
import javax.servlet.http.HttpServletRequest;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
 
/**
 * @author ydf
 * @date 2021/5/13
 * @description:
 **/
public class FeignBasicAuthRequestInterceptor implements RequestInterceptor {
 
  @Override
  public void apply(RequestTemplate requestTemplate) {
    ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder
        .getRequestAttributes();
    HttpServletRequest request = attributes.getRequest();
    Enumeration<String> headerNames = request.getHeaderNames();
    if (headerNames != null) {
      while (headerNames.hasMoreElements()) {
        String name = headerNames.nextElement();
        String values = request.getHeader(name);
        requestTemplate.header(name, values);
      }
    }
  }
}

import com.jingling.netsign.applet.interceptor.FeignBasicAuthRequestInterceptor;
import feign.RequestInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration; 
/**
 * @author ydf
 * @date 2021/5/13
 * @description:
 **/
@Configuration
public class FeignSupportConfig {
  /**
   * feign請求攔截器
   *
   * @return
   */
  @Bean
  public RequestInterceptor requestInterceptor(){
    return new FeignBasicAuthRequestInterceptor();
  }
}

以上為個人經(jīng)驗，希望能給大家一個參考，也希望大家多多支持腳本之家。

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