errorcode.DaumStatusServerHandler.java Source code

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Here is the source code for errorcode.DaumStatusServerHandler.java

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/*
 * Copyright 2013 The Netty Project
 *
 * The Netty Project 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 errorcode;

import java.io.*;

import io.netty.buffer.Unpooled;
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.HttpRequest;
import io.netty.handler.codec.http.QueryStringDecoder;
import static io.netty.handler.codec.http.HttpHeaders.Names.*;
import static io.netty.handler.codec.http.HttpHeaders.*;
import static io.netty.handler.codec.http.HttpResponseStatus.*;
import static io.netty.handler.codec.http.HttpVersion.*;

public class DaumStatusServerHandler extends ChannelInboundHandlerAdapter {
    private static byte[] E404;
    private static byte[] E503;

    static {
        ByteArrayOutputStream ous = null;
        InputStream ios = null;
        try {
            byte[] buffer = new byte[4096];
            ous = new ByteArrayOutputStream();
            ios = new FileInputStream(new File("/Users/ihongjun/Factory/Test-Netty/bin/404.html"));
            int read = 0;
            while ((read = ios.read(buffer)) != -1) {
                ous.write(buffer, 0, read);
            }
            ios.close();
            E404 = ous.toByteArray();

            ous.reset();
            ios = new FileInputStream(new File("/Users/ihongjun/Factory/Test-Netty/bin/503.html"));
            read = 0;
            while ((read = ios.read(buffer)) != -1) {
                ous.write(buffer, 0, read);
            }
            E503 = ous.toByteArray();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (ous != null)
                    ous.close();
            } catch (IOException e) {
            }

            try {
                if (ios != null)
                    ios.close();
            } catch (IOException e) {
            }
        }

    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        ctx.flush();
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        FullHttpResponse response = null;

        if (msg instanceof HttpRequest) {
            HttpRequest req = (HttpRequest) msg;
            QueryStringDecoder queryDecoder = new QueryStringDecoder(req.getUri());

            if (is100ContinueExpected(req)) {
                ctx.write(new DefaultFullHttpResponse(HTTP_1_1, CONTINUE));
            }
            boolean keepAlive = isKeepAlive(req);
            if (queryDecoder.path().startsWith("/503.html")) {
                response = new DefaultFullHttpResponse(HTTP_1_1, OK, Unpooled.wrappedBuffer(E503));
                response.setStatus(SERVICE_UNAVAILABLE);
            } else {
                response = new DefaultFullHttpResponse(HTTP_1_1, OK, Unpooled.wrappedBuffer(E404));
                response.setStatus(NOT_FOUND);
            }

            response.headers().set(CONTENT_TYPE, "text/html");
            response.headers().set(CONTENT_LENGTH, response.content().readableBytes());

            if (!keepAlive) {
                ctx.write(response).addListener(ChannelFutureListener.CLOSE);
            } else {
                response.headers().set(CONNECTION, Values.KEEP_ALIVE);
                ctx.write(response);
            }
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        cause.printStackTrace();
        ctx.close();
    }
}