Feign 調用丟失Header的解決方案

問題

在 Spring Cloud 中 微服務之間的調用會用到Feign，可是在默認狀況下，Feign 調用遠程服務存在Header請求頭丟失問題。

解決方案

首先須要寫一個 Feign請求攔截器，經過實現RequestInterceptor接口,完成對全部的Feign請求,傳遞請求頭和請求參數。

Feign 請求攔截器

public class FeignBasicAuthRequestInterceptor implements RequestInterceptor {

    private static final Logger logger = LoggerFactory.getLogger(FeignBasicAuthRequestInterceptor.class);

    @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);
            }
        }
        Enumeration<String> bodyNames = request.getParameterNames();
        StringBuffer body =new StringBuffer();
        if (bodyNames != null) {
            while (bodyNames.hasMoreElements()) {
                String name = bodyNames.nextElement();
                String values = request.getParameter(name);
                body.append(name).append("=").append(values).append("&");
            }
        }
        if(body.length()!=0) {
            body.deleteCharAt(body.length()-1);
            requestTemplate.body(body.toString());
            logger.info("feign interceptor body:{}",body.toString());
        }
    }
}
複製代碼

經過配置文件配置 讓 全部 FeignClient，來使用 FeignBasicAuthRequestInterceptor

feign:
 client:
 config:
 default:
 connectTimeout: 5000
 readTimeout: 5000
 loggerLevel: basic
 requestInterceptors: com.leparts.config.FeignBasicAuthRequestInterceptor
複製代碼

也能夠配置讓 某個 FeignClient 來使用這個 FeignBasicAuthRequestInterceptor

feign:
 client:
 config:
 xxxx: # 遠程服務名
 connectTimeout: 5000
 readTimeout: 5000
 loggerLevel: basic
 requestInterceptors: com.leparts.config.FeignBasicAuthRequestInterceptor
複製代碼

通過測試，上面的解決方案能夠正常的使用；可是出現了新的問題。

在轉發Feign的請求頭的時候, 若是開啓了Hystrix, Hystrix的默認隔離策略是Thread(線程隔離策略), 所以轉發攔截器內是沒法獲取到請求的請求頭信息的。

能夠修改默認隔離策略爲信號量模式：

hystrix.command.default.execution.isolation.strategy=SEMAPHORE
複製代碼

但信號量模式不是官方推薦的隔離策略;另外一個解決方法就是自定義Hystrix的隔離策略。

自定義策略

HystrixConcurrencyStrategy 是提供給開發者去自定義hystrix內部線程池及其隊列，還提供了包裝callable的方法，以及傳遞上下文變量的方法。因此能夠繼承了HystrixConcurrencyStrategy，用來實現了本身的併發策略。

@Component
public class FeignHystrixConcurrencyStrategy extends HystrixConcurrencyStrategy {

    private static final Logger log = LoggerFactory.getLogger(FeignHystrixConcurrencyStrategy.class);

    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 instance = HystrixPlugins.getInstance();
            instance.registerConcurrencyStrategy(this);
            instance.registerCommandExecutionHook(commandExecutionHook);
            instance.registerEventNotifier(eventNotifier);
            instance.registerMetricsPublisher(metricsPublisher);
            instance.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;

        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();
            }
        }
    }
}
複製代碼

致此，Feign調用丟失請求頭的問題就解決的了 。

參考

blog.csdn.net/zl1zl2zl3/a…
cloud.spring.io/spring-clou…

關注我