/* * Copyright (c) 2018-2028, DreamLu All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * Neither the name of the dreamlu.net developer nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * Author: DreamLu 卢春梦 (596392912@qq.com) */ package org.springblade.core.cloud.feign; import com.fasterxml.jackson.databind.JsonNode; import feign.FeignException; import lombok.AllArgsConstructor; import lombok.extern.slf4j.Slf4j; import org.springblade.core.tool.api.R; import org.springblade.core.tool.api.ResultCode; import org.springblade.core.tool.jackson.JsonUtil; import org.springblade.core.tool.utils.ObjectUtil; import org.springframework.cglib.proxy.MethodInterceptor; import org.springframework.cglib.proxy.MethodProxy; import org.springframework.lang.Nullable; import java.lang.reflect.Method; import java.util.*; /** * blade fallBack 代理处理 * * @author L.cm */ @Slf4j @AllArgsConstructor public class BladeFeignFallback implements MethodInterceptor { private final Class targetType; private final String targetName; private final Throwable cause; private final static String CODE = "code"; @Nullable @Override public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable { String errorMessage = cause.getMessage(); log.error("BladeFeignFallback:[{}.{}] serviceId:[{}] message:[{}]", targetType.getName(), method.getName(), targetName, errorMessage); Class returnType = method.getReturnType(); // 集合类型反馈空集合 if (List.class == returnType || Collection.class == returnType) { return Collections.emptyList(); } if (Set.class == returnType) { return Collections.emptySet(); } if (Map.class == returnType) { return Collections.emptyMap(); } // 暂时不支持 flux,rx,异步等,返回值不是 R,直接返回 null。 if (R.class != returnType) { return null; } // 非 FeignException if (!(cause instanceof FeignException)) { return R.fail(ResultCode.INTERNAL_SERVER_ERROR, errorMessage); } FeignException exception = (FeignException) cause; byte[] content = exception.content(); // 如果返回的数据为空 if (ObjectUtil.isEmpty(content)) { return R.fail(ResultCode.INTERNAL_SERVER_ERROR, errorMessage); } // 转换成 jsonNode 读取,因为直接转换,可能 对方放回的并 不是 R 的格式。 JsonNode resultNode = JsonUtil.readTree(content); // 判断是否 R 格式 返回体 if (resultNode.has(CODE)) { return JsonUtil.getInstance().convertValue(resultNode, R.class); } return R.fail(resultNode.toString()); } @Override public boolean equals(Object o) { if (this == o) { return true; } if (o == null || getClass() != o.getClass()) { return false; } BladeFeignFallback that = (BladeFeignFallback) o; return targetType.equals(that.targetType); } @Override public int hashCode() { return Objects.hash(targetType); } }