cn.dennishucd.nettyhttpserver.HttpServerHandler.java Source code

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Here is the source code for cn.dennishucd.nettyhttpserver.HttpServerHandler.java

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/*
 * Copyright 2016 Dennis Hu
 *
 * Dennis Hu 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 cn.dennishucd.nettyhttpserver;

import static io.netty.handler.codec.http.HttpHeaderNames.CONNECTION;
import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_LENGTH;
import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_TYPE;
import static io.netty.handler.codec.http.HttpHeaderNames.KEEP_ALIVE;
import static io.netty.handler.codec.http.HttpResponseStatus.CONTINUE;
import static io.netty.handler.codec.http.HttpResponseStatus.NOT_FOUND;
import static io.netty.handler.codec.http.HttpResponseStatus.OK;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
import io.netty.buffer.ByteBuf;
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.HttpContent;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpUtil;
import io.netty.util.CharsetUtil;

import org.apache.log4j.Logger;

import cn.dennishucd.utils.CTools;

public class HttpServerHandler extends ChannelInboundHandlerAdapter {

    private Logger logger = Logger.getLogger(this.getClass());

    private static final String CONTENT = "{\"code\":2000,\"msg\":\"?\"}";

    private static final String URL = "/rest/push/token";

    private HttpRequest request;

    @SuppressWarnings("deprecation")
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        if (msg instanceof HttpRequest) {
            request = (HttpRequest) msg;

            if (HttpUtil.is100ContinueExpected(request)) {
                ctx.write(new DefaultFullHttpResponse(HTTP_1_1, CONTINUE));
            }

            if (!request.uri().equalsIgnoreCase(URL)) {
                sendError(ctx, NOT_FOUND);

                return;
            }
        }

        if (msg instanceof HttpContent) {
            HttpContent content = (HttpContent) msg;
            ByteBuf buf = content.content();
            UserToken ut = CTools.JSONStr2Object(buf.toString(io.netty.util.CharsetUtil.UTF_8), UserToken.class);

            logger.info("request body: " + buf.toString(io.netty.util.CharsetUtil.UTF_8));
            buf.release();

            boolean keepAlive = HttpUtil.isKeepAlive(request);
            FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK,
                    Unpooled.wrappedBuffer(CONTENT.getBytes()));
            response.headers().set(CONTENT_TYPE, "application/json");
            response.headers().setInt(CONTENT_LENGTH, response.content().readableBytes());

            logger.info("response body: " + CONTENT);

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

        } else {
            ctx.fireChannelRead(msg);
        }
    }

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

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

    private static void sendError(ChannelHandlerContext ctx, HttpResponseStatus status) {
        FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, status,
                Unpooled.copiedBuffer("Failure: " + status + "\r\n", CharsetUtil.UTF_8));
        response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain; charset=UTF-8");

        // Close the connection as soon as the error message is sent.
        ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
    }
}