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.fs.http.server;
020    
021    import org.apache.hadoop.lib.service.FileSystemAccessException;
022    import org.apache.hadoop.lib.wsrs.ExceptionProvider;
023    import org.slf4j.Logger;
024    import org.slf4j.LoggerFactory;
025    import org.slf4j.MDC;
026    
027    import javax.ws.rs.core.Response;
028    import javax.ws.rs.ext.Provider;
029    import java.io.FileNotFoundException;
030    import java.io.IOException;
031    
032    /**
033     * JAX-RS <code>ExceptionMapper</code> implementation that maps HttpFSServer's
034     * exceptions to HTTP status codes.
035     */
036    @Provider
037    public class HttpFSExceptionProvider extends ExceptionProvider {
038      private static Logger AUDIT_LOG = LoggerFactory.getLogger("httpfsaudit");
039      private static Logger LOG = LoggerFactory.getLogger(HttpFSExceptionProvider.class);
040    
041      /**
042       * Maps different exceptions thrown by HttpFSServer to HTTP status codes.
043       * <p/>
044       * <ul>
045       * <li>SecurityException : HTTP UNAUTHORIZED</li>
046       * <li>FileNotFoundException : HTTP NOT_FOUND</li>
047       * <li>IOException : INTERNAL_HTTP SERVER_ERROR</li>
048       * <li>UnsupporteOperationException : HTTP BAD_REQUEST</li>
049       * <li>all other exceptions : HTTP INTERNAL_SERVER_ERROR </li>
050       * </ul>
051       *
052       * @param throwable exception thrown.
053       *
054       * @return mapped HTTP status code
055       */
056      @Override
057      public Response toResponse(Throwable throwable) {
058        Response.Status status;
059        if (throwable instanceof FileSystemAccessException) {
060          throwable = throwable.getCause();
061        }
062        if (throwable instanceof SecurityException) {
063          status = Response.Status.UNAUTHORIZED;
064        } else if (throwable instanceof FileNotFoundException) {
065          status = Response.Status.NOT_FOUND;
066        } else if (throwable instanceof IOException) {
067          status = Response.Status.INTERNAL_SERVER_ERROR;
068        } else if (throwable instanceof UnsupportedOperationException) {
069          status = Response.Status.BAD_REQUEST;
070        } else {
071          status = Response.Status.INTERNAL_SERVER_ERROR;
072        }
073        return createResponse(status, throwable);
074      }
075    
076      /**
077       * Logs the HTTP status code and exception in HttpFSServer's log.
078       *
079       * @param status HTTP status code.
080       * @param throwable exception thrown.
081       */
082      @Override
083      protected void log(Response.Status status, Throwable throwable) {
084        String method = MDC.get("method");
085        String path = MDC.get("path");
086        String message = getOneLineMessage(throwable);
087        AUDIT_LOG.warn("FAILED [{}:{}] response [{}] {}", new Object[]{method, path, status, message});
088        LOG.warn("[{}:{}] response [{}] {}", new Object[]{method, path, status, message, throwable});
089      }
090    
091    }