使用Feign调用设置请求头信息

不念不忘少年蓝@ 2022-10-10 11:11 406阅读 0赞

添加feign拦截器，统一设置请求头

package com.will.common.filter;
    
    import feign.RequestInterceptor;
    import feign.RequestTemplate;
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.web.context.request.RequestContextHolder;
    import org.springframework.web.context.request.ServletRequestAttributes;
    
    import javax.servlet.http.HttpServletRequest;
    
    /**
     * Feign拦截器
     */
    @Slf4j
    public class FeignClientInterceptor implements RequestInterceptor {
    
        @Override
        public void apply(RequestTemplate template) {
            try {
                // 获取请求对象
                ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
                if (servletRequestAttributes != null) {
                    HttpServletRequest request = servletRequestAttributes.getRequest();
                    // 获取当前请求的header，获取到jwt令牌
                    if (request.getHeader("Authorization") != null) {
                        template.header("Authorization", request.getHeader("Authorization"));
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

添加hystrix自定义策略

package com.will.common.config;
    
    import com.netflix.hystrix.HystrixThreadPoolKey;
    import com.netflix.hystrix.HystrixThreadPoolProperties;
    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 lombok.extern.slf4j.Slf4j;
    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;
    
    
    @Slf4j
    @Configuration
    public class FeignHystrixConcurrencyStrategy extends HystrixConcurrencyStrategy {
        private HystrixConcurrencyStrategy delegate;
    
        public FeignHystrixConcurrencyStrategy() {
            try {
                this.delegate = HystrixPlugins.getInstance().getConcurrencyStrategy();
                if (this.delegate instanceof FeignHystrixConcurrencyStrategy) {
                    // 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 ThreadPoolExecutor getThreadPool(HystrixThreadPoolKey threadPoolKey,
                                                HystrixThreadPoolProperties threadPoolProperties) {
            return this.delegate.getThreadPool(threadPoolKey, threadPoolProperties);
        }
    
        @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();
                }
            }
        }
    
    
    }

如果说是异步feign调用需要将原来线程的上下文信息，加入到新的线程上下文

RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
                AsyncManager.me().execute(() -> {
                    RequestContextHolder.setRequestAttributes(requestAttributes);
                    
                });

参考博客：[https://blog.csdn.net/crystalqy/article/details/79083857][https_blog.csdn.net_crystalqy_article_details_79083857]

[https_blog.csdn.net_crystalqy_article_details_79083857]: https://blog.csdn.net/crystalqy/article/details/79083857