4dkankan-parent/4dkankan-common/src/main/java/com/fdkankan/common/config/ResultStatusDecoder.java

package com.fdkankan.common.config;

import com.alibaba.cloud.commons.io.IOUtils;
import com.alibaba.fastjson.JSONObject;
import com.fdkankan.common.constant.ServerCode;
import com.fdkankan.common.exception.BusinessException;
import com.fdkankan.common.response.ResultData;
import feign.Response;
import feign.codec.Decoder;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
import java.lang.reflect.Type;
import java.nio.charset.StandardCharsets;
import java.util.Objects;

@Slf4j
public final class ResultStatusDecoder implements Decoder {

    public static final String CONTENT_KEY = "content";
    final Decoder delegate;

    public ResultStatusDecoder(Decoder delegate) {
        Objects.requireNonNull(delegate, "Decoder must not be null. ");
        this.delegate = delegate;
    }

    @Override
    public Object decode(Response response, Type type) throws IOException {
        // 判断是否返回参数是否是异常
        String resultStr = IOUtils.toString(response.body().asInputStream(), StandardCharsets.UTF_8);
        log.info("feign调用返回,result msg ->{}",resultStr);
        try {
            ResultData resultData = JSONObject.parseObject(resultStr, ResultData.class);
            if(resultData.getCode() != ServerCode.SUCCESS.code()){
                throw new BusinessException(resultData.getCode(),resultData.getMessage());
            }
        }catch (Exception e){
            e.printStackTrace();
        }
        // 回写body
        return delegate.decode(response.toBuilder().body(resultStr, StandardCharsets.UTF_8).build(), type);
    }
}