统一处理@FeignClient调用接口异常原样抛出

第三方系统调用我方系统@FeignClient接口时报错 com.netflix.hystrix.exception.HystrixRuntimeException: WorkFlowTaskOperateService#processWorkFlowTaskSyncCallback(TaskProcessDTO) failed and no fallback available.

我方系统出现FeignException.

 第三方调用者抛出的异常:HystrixRuntimeException

一检查我们系统确实没有指定fallback和configuration,并且调用方开启了feign.hystrix.enabled: true

@FeignClient(value = "taxplan-workflow")

修改方法:

第三方调用在Application.java添加处理Feign异常的全局处理方法

@Bean
public Feign.Builder feignBuilder() {
    return Feign.builder().requestInterceptor(new RequestInterceptor() {
        @Override
        public void apply(RequestTemplate requestTemplate) {
            Map<String, String> customHeaders = WebUtils.getCustomHeaders();
            customHeaders.forEach((k, v) -> {
                requestTemplate.header(k, v);
            });
        }
    }).errorDecoder(new CustomErrorDecoder());
}

这里使用了RequestInterceptor拦截器,可以定制请求头,如果不想定制,可以改为

return Feign.builder().errorDecoder(new CustomErrorDecoder());

实现ErrorDecoder接口,其中ExceptionCode是枚举类.

public Exception decode(String methodKey, Response response) {
        if (response.status() >= 400 && response.status() <= 499) {
            return new BaseBizException(ExceptionCode.CALL_INNER_ERROR, "Client error.httpStatusCode:" + response.status());
        } else {
            if (response.status() >= 500 && response.status() <= 599 && response.body() != null) {
                try {
                    String content = CharStreams.toString(new InputStreamReader(response.body().asInputStream(), StandardCharsets.UTF_8));
                    Map responseBody = (Map) JSONObject.parseObject(content, Map.class);
                    if (responseBody.containsKey("code")) {
                        return new BaseBizException(responseBody.get("code").toString(), Objects.toString(responseBody.get("msg")));
                    }
                } catch (Exception var5) {
                }
            }

            return new BaseBizException(ExceptionCode.CALL_INNER_ERROR);
        }
    }

ExceptionCode枚举类如下:可以自定义增加删除

public enum ExceptionCode {
    ILLEGAL_STATE(4001, "非法访问"),
    PARAM_REQUIRED(4002, "参数不能为空"),
    PARAM_FORMAT_ILLEGAL(4003, "参数格式错误"),
    REQUEST_DATA_DUPLICATION(4004, "重复请求"),
    REQUEST_DATA_ERROR(4005, "请求数据错误"),
    REQUEST_DATA_NOT_MATCH(4006, "请求数据不一致"),
    RECORD_NOT_EXIST(5001, "记录不存在"),
    RECORD_EXISTED(5002, "记录已存在"),
    RECORD_ILLEGAL_STATE(5003, "数据异常"),
    BALANCE_NOT_ENOUGH(5103, "余额不足"),
    CALL_INNER_ERROR(5800, "调用内部服务接口异常"),
    THIRD_PART_ERROR(5801, "调用第三方接口异常"),
    SYSTEM_ERROR(9999, "系统异常");

    public final int code;
    public final String defaultMessage;

    private ExceptionCode(int code, String defaultMessage) {
        this.code = code;
        this.defaultMessage = defaultMessage;
    }
}

参考:

1.Spring Cloud Feign 熔断机制填坑

2.探讨通过Feign配合Hystrix进行调用时异常的处理