假装客户端和Spring重试

Question

我有一个宁静的服务，使用Spring Cloud Feign客户端调用外部服务

@FeignClient(name = "external-service", configuration = FeignClientConfig.class)
public interface ServiceClient {

    @RequestMapping(value = "/test/payments", method = RequestMethod.POST)
    public void addPayment(@Valid @RequestBody AddPaymentRequest addPaymentRequest);

    @RequestMapping(value = "/test/payments/{paymentId}", method = RequestMethod.PUT)
    public ChangePaymentStatusResponse updatePaymentStatus(@PathVariable("paymentId") String paymentId,
            @Valid @RequestBody PaymentStatusUpdateRequest paymentStatusUpdateRequest);

}

我在日志文件中注意到过去3个月中3-4次失败：

json.ERROR_RESPONSE_BODY：连接拒绝执行POST http://external-service/external/payments json.message：发送付款添加付款失败由于其他原因：{ERROR_RESPONSE_BODY =连接拒绝执行POST http://external-service/external/payments，EVENT = ADD_PAYMENT_FAILURE，TRANSACTION_ID = XXXXXXX} {} json.EVENT：ADD_PAYMENT_FAILURE json.stack_trace： feign.RetryableException：连接拒绝在feign.FeignException.errorExecuting（FeignException.java：67）feign.SynchronousMethodHandler.executeAndDecode（SynchronousMethodHandler.java:104）feign.SynchronousMethodHandler.invoke（SynchronousMethodHandler.java:76）假装在feign.FeignException.errorExecuting（FeignException.java：67）执行POST http://external-service/external/payments .ReflectiveFeign $ FeignInvocationHandler.invoke（ReflectiveFeign.java:103）

是否可以在Feign客户端上添加Spring Retry。我想用它来注释addPayment操作

@Retryable(value = {feign.RetryableException.class }, maxAttempts = 3, backoff = @Backoff(delay = 2000, multiplier=2))

但这是不可能的，我还有其他选择吗？

Answer 1

你可以在Retryer中添加一个FeignClientConfig

@Configuration
public class FeignClientConfig {

    @Bean
    public Retryer retryer() {
        return new Custom();
    }

}

class Custom implements Retryer {

    private final int maxAttempts;
    private final long backoff;
    int attempt;

    public Custom() {
        this(2000, 3);
    }

    public Custom(long backoff, int maxAttempts) {
        this.backoff = backoff;
        this.maxAttempts = maxAttempts;
        this.attempt = 1;
    }

    public void continueOrPropagate(RetryableException e) {
        if (attempt++ >= maxAttempts) {
            throw e;
        }

        try {
            Thread.sleep(backoff);
        } catch (InterruptedException ignored) {
            Thread.currentThread().interrupt();
        }
    }

    @Override
    public Retryer clone() {
        return new Custom(backoff, maxAttempts);
    }
}

更新了基于Retryer的示例Retryer.Default示例配置。

Answer 2

如果您使用功能区可以设置属性，则可以使用以下属性进行重试：

myapp.ribbon.MaxAutoRetries=5
myapp.ribbon.MaxAutoRetriesNextServer=5
myapp.ribbon.OkToRetryOnAllOperations=true

注意：“myapp”是您的服务ID。

查看这个Github implementation的工作示例