/*
* Copyright 2014-2016 CyberVision, Inc.
*
* Licensed 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.kaaproject.kaa.server.transports.http.transport.netty;
import static io.netty.handler.codec.http.HttpHeaders.Names.CONNECTION;
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.INTERNAL_SERVER_ERROR;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.util.CharsetUtil;
import org.kaaproject.kaa.server.common.server.BadRequestException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* DefaultExceptionHandler Class. Used to generate HTTP response in case of
* error during HTTP request processing.
*/
public class DefaultExceptionHandler extends ChannelInboundHandlerAdapter {
private static final Logger LOG = LoggerFactory
.getLogger(DefaultExceptionHandler.class);
@Override
public final void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause)
throws Exception {
LOG.error("Exception caught", cause);
HttpResponseStatus status;
if (cause instanceof BadRequestException) {
status = BAD_REQUEST;
} else {
status = INTERNAL_SERVER_ERROR;
}
String content = cause.getMessage();
FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1,
status, Unpooled.copiedBuffer(content, CharsetUtil.UTF_8));
response.headers().set(CONTENT_TYPE, "text/plain; charset=UTF-8");
response.headers().set(CONTENT_LENGTH,
response.content().readableBytes());
response.headers().set(CONNECTION, HttpHeaders.Values.CLOSE);
ChannelFuture future = ctx.writeAndFlush(response);
future.addListener(ChannelFutureListener.CLOSE);
ctx.close();
}
}