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 */ 018 019 package org.apache.hadoop.lib.wsrs; 020 021 import org.apache.hadoop.classification.InterfaceAudience; 022 import org.apache.hadoop.fs.http.client.HttpFSFileSystem; 023 import org.slf4j.Logger; 024 import org.slf4j.LoggerFactory; 025 026 import javax.ws.rs.core.MediaType; 027 import javax.ws.rs.core.Response; 028 import javax.ws.rs.ext.ExceptionMapper; 029 import java.util.LinkedHashMap; 030 import java.util.Map; 031 032 @InterfaceAudience.Private 033 public class ExceptionProvider implements ExceptionMapper<Throwable> { 034 private static Logger LOG = LoggerFactory.getLogger(ExceptionProvider.class); 035 036 private static final String ENTER = System.getProperty("line.separator"); 037 038 protected Response createResponse(Response.Status status, Throwable throwable) { 039 Map<String, Object> json = new LinkedHashMap<String, Object>(); 040 json.put(HttpFSFileSystem.ERROR_MESSAGE_JSON, getOneLineMessage(throwable)); 041 json.put(HttpFSFileSystem.ERROR_EXCEPTION_JSON, throwable.getClass().getSimpleName()); 042 json.put(HttpFSFileSystem.ERROR_CLASSNAME_JSON, throwable.getClass().getName()); 043 Map<String, Object> response = new LinkedHashMap<String, Object>(); 044 response.put(HttpFSFileSystem.ERROR_JSON, json); 045 log(status, throwable); 046 return Response.status(status).type(MediaType.APPLICATION_JSON).entity(response).build(); 047 } 048 049 protected String getOneLineMessage(Throwable throwable) { 050 String message = throwable.getMessage(); 051 if (message != null) { 052 int i = message.indexOf(ENTER); 053 if (i > -1) { 054 message = message.substring(0, i); 055 } 056 } 057 return message; 058 } 059 060 protected void log(Response.Status status, Throwable throwable) { 061 LOG.debug("{}", throwable.getMessage(), throwable); 062 } 063 064 @Override 065 public Response toResponse(Throwable throwable) { 066 return createResponse(Response.Status.BAD_REQUEST, throwable); 067 } 068 069 }