com.github.zg2pro.spring.rest.basis.exceptions.RestTemplateErrorHandler Maven / Gradle / Ivy

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A library of tools that come handy when doing spring-rest development
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/*
 * The MIT License
 *
 * Copyright 2017 zg2pro.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.github.zg2pro.spring.rest.basis.exceptions;

import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.web.client.ResponseErrorHandler;

/**
 * @author zg2pro
 * @since 0.2
 *
 * transforms the errors triggered on server side so they can be serialized and
 * thrown up to the client side
 */
public class RestTemplateErrorHandler implements ResponseErrorHandler {

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

    private ObjectMapper om = new ObjectMapper();

    @Override
    public void handleError(ClientHttpResponse response) throws IOException {
        logger.error("Response error: {} {}", response.getStatusCode(), response.getStatusText());
        ErrorResource er = om.readValue(response.getBody(), ErrorResource.class);
        if (er == null) {
            throw new IOException("Error reading the response");
        }
        StackTraceElement[] stack = StackTracedException.mapper(er.getStackTrace());
        for (StackTraceElement ste : stack) {
            logger.error(ste.toString());
        }
        throw new RestTemplateException("An error occured when contacting the rest server...", er);
    }

    @Override
    public boolean hasError(ClientHttpResponse response) throws IOException {
        HttpStatus.Series series = response.getStatusCode().series();
        return (HttpStatus.Series.CLIENT_ERROR.equals(series)
                || HttpStatus.Series.SERVER_ERROR.equals(series));
    }
}