001/** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 019package org.apache.hadoop.lib.wsrs; 020 021import org.apache.hadoop.fs.http.client.HttpFSFileSystem; 022import org.slf4j.Logger; 023import org.slf4j.LoggerFactory; 024 025import javax.ws.rs.core.MediaType; 026import javax.ws.rs.core.Response; 027import javax.ws.rs.ext.ExceptionMapper; 028import java.util.LinkedHashMap; 029import java.util.Map; 030 031public class ExceptionProvider implements ExceptionMapper<Throwable> { 032 private static Logger LOG = LoggerFactory.getLogger(ExceptionProvider.class); 033 034 private static final String ENTER = System.getProperty("line.separator"); 035 036 protected Response createResponse(Response.Status status, Throwable throwable) { 037 Map<String, Object> json = new LinkedHashMap<String, Object>(); 038 json.put(HttpFSFileSystem.ERROR_MESSAGE_JSON, getOneLineMessage(throwable)); 039 json.put(HttpFSFileSystem.ERROR_EXCEPTION_JSON, throwable.getClass().getSimpleName()); 040 json.put(HttpFSFileSystem.ERROR_CLASSNAME_JSON, throwable.getClass().getName()); 041 Map<String, Object> response = new LinkedHashMap<String, Object>(); 042 response.put(HttpFSFileSystem.ERROR_JSON, json); 043 log(status, throwable); 044 return Response.status(status).type(MediaType.APPLICATION_JSON).entity(response).build(); 045 } 046 047 protected String getOneLineMessage(Throwable throwable) { 048 String message = throwable.getMessage(); 049 if (message != null) { 050 int i = message.indexOf(ENTER); 051 if (i > -1) { 052 message = message.substring(0, i); 053 } 054 } 055 return message; 056 } 057 058 protected void log(Response.Status status, Throwable throwable) { 059 LOG.debug("{}", throwable.getMessage(), throwable); 060 } 061 062 @Override 063 public Response toResponse(Throwable throwable) { 064 return createResponse(Response.Status.BAD_REQUEST, throwable); 065 } 066 067}