| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.hdfs.server.datanode.web.webhdfs; |
| |
| import com.google.common.base.Charsets; |
| import com.sun.jersey.api.ParamException; |
| import com.sun.jersey.api.container.ContainerException; |
| import io.netty.buffer.Unpooled; |
| import io.netty.handler.codec.http.DefaultFullHttpResponse; |
| import io.netty.handler.codec.http.HttpResponseStatus; |
| import org.apache.commons.logging.Log; |
| import org.apache.hadoop.hdfs.web.JsonUtil; |
| import org.apache.hadoop.ipc.RemoteException; |
| import org.apache.hadoop.ipc.StandbyException; |
| import org.apache.hadoop.security.authorize.AuthorizationException; |
| import org.apache.hadoop.security.token.SecretManager; |
| |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| |
| import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_LENGTH; |
| import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_TYPE; |
| import static io.netty.handler.codec.http.HttpResponseStatus.BAD_REQUEST; |
| import static io.netty.handler.codec.http.HttpResponseStatus.FORBIDDEN; |
| import static io.netty.handler.codec.http.HttpResponseStatus.INTERNAL_SERVER_ERROR; |
| import static io.netty.handler.codec.http.HttpResponseStatus.NOT_FOUND; |
| import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1; |
| import static org.apache.hadoop.hdfs.server.datanode.web.webhdfs.WebHdfsHandler.APPLICATION_JSON_UTF8; |
| |
| class ExceptionHandler { |
| static Log LOG = WebHdfsHandler.LOG; |
| |
| static DefaultFullHttpResponse exceptionCaught(Throwable cause) { |
| Exception e = cause instanceof Exception ? (Exception) cause : new Exception(cause); |
| |
| if (LOG.isTraceEnabled()) { |
| LOG.trace("GOT EXCEPTION", e); |
| } |
| |
| //Convert exception |
| if (e instanceof ParamException) { |
| final ParamException paramexception = (ParamException)e; |
| e = new IllegalArgumentException("Invalid value for webhdfs parameter \"" |
| + paramexception.getParameterName() + "\": " |
| + e.getCause().getMessage(), e); |
| } else if (e instanceof ContainerException || e instanceof SecurityException) { |
| e = toCause(e); |
| } else if (e instanceof RemoteException) { |
| e = ((RemoteException)e).unwrapRemoteException(); |
| } |
| |
| //Map response status |
| final HttpResponseStatus s; |
| if (e instanceof SecurityException) { |
| s = FORBIDDEN; |
| } else if (e instanceof AuthorizationException) { |
| s = FORBIDDEN; |
| } else if (e instanceof FileNotFoundException) { |
| s = NOT_FOUND; |
| } else if (e instanceof IOException) { |
| s = FORBIDDEN; |
| } else if (e instanceof UnsupportedOperationException) { |
| s = BAD_REQUEST; |
| } else if (e instanceof IllegalArgumentException) { |
| s = BAD_REQUEST; |
| } else { |
| LOG.warn("INTERNAL_SERVER_ERROR", e); |
| s = INTERNAL_SERVER_ERROR; |
| } |
| |
| final byte[] js = JsonUtil.toJsonString(e).getBytes(Charsets.UTF_8); |
| DefaultFullHttpResponse resp = |
| new DefaultFullHttpResponse(HTTP_1_1, s, Unpooled.wrappedBuffer(js)); |
| |
| resp.headers().set(CONTENT_TYPE, APPLICATION_JSON_UTF8); |
| resp.headers().set(CONTENT_LENGTH, js.length); |
| return resp; |
| } |
| |
| private static Exception toCause(Exception e) { |
| final Throwable t = e.getCause(); |
| if (e instanceof SecurityException) { |
| // For the issue reported in HDFS-6475, if SecurityException's cause |
| // is InvalidToken, and the InvalidToken's cause is StandbyException, |
| // return StandbyException; Otherwise, leave the exception as is, |
| // since they are handled elsewhere. See HDFS-6588. |
| if (t != null && t instanceof SecretManager.InvalidToken) { |
| final Throwable t1 = t.getCause(); |
| if (t1 != null && t1 instanceof StandbyException) { |
| e = (StandbyException)t1; |
| } |
| } |
| } else { |
| if (t != null && t instanceof Exception) { |
| e = (Exception)t; |
| } |
| } |
| return e; |
| } |
| |
| } |