+++ /dev/null
-/*
- * Copyright (c) 2014, 2015 Cisco Systems, Inc. and others. All rights reserved.
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Public License v1.0 which accompanies this distribution,
- * and is available at http://www.eclipse.org/legal/epl-v10.html
- */
-
-package org.opendaylight.controller.sal.streams.websockets;
-
-import static io.netty.handler.codec.http.HttpHeaders.isKeepAlive;
-import static io.netty.handler.codec.http.HttpHeaders.setContentLength;
-import static io.netty.handler.codec.http.HttpHeaders.Names.HOST;
-import static io.netty.handler.codec.http.HttpMethod.GET;
-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.HttpVersion.HTTP_1_1;
-
-import io.netty.buffer.ByteBuf;
-import io.netty.buffer.Unpooled;
-import io.netty.channel.ChannelFuture;
-import io.netty.channel.ChannelFutureListener;
-import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.SimpleChannelInboundHandler;
-import io.netty.handler.codec.http.DefaultFullHttpResponse;
-import io.netty.handler.codec.http.FullHttpRequest;
-import io.netty.handler.codec.http.FullHttpResponse;
-import io.netty.handler.codec.http.HttpRequest;
-import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
-import io.netty.handler.codec.http.websocketx.PingWebSocketFrame;
-import io.netty.handler.codec.http.websocketx.PongWebSocketFrame;
-import io.netty.handler.codec.http.websocketx.WebSocketFrame;
-import io.netty.handler.codec.http.websocketx.WebSocketServerHandshaker;
-import io.netty.handler.codec.http.websocketx.WebSocketServerHandshakerFactory;
-import io.netty.util.CharsetUtil;
-import java.io.IOException;
-import org.opendaylight.controller.sal.streams.listeners.ListenerAdapter;
-import org.opendaylight.controller.sal.streams.listeners.Notificator;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-/**
- * {@link WebSocketServerHandler} is implementation of {@link SimpleChannelInboundHandler} which allow handle
- * {@link FullHttpRequest} and {@link WebSocketFrame} messages.
- */
-public class WebSocketServerHandler extends SimpleChannelInboundHandler<Object> {
-
- private static final Logger logger = LoggerFactory.getLogger(WebSocketServerHandler.class);
-
- private WebSocketServerHandshaker handshaker;
-
- @Override
- protected void channelRead0(final ChannelHandlerContext ctx, final Object msg) throws Exception {
- if (msg instanceof FullHttpRequest) {
- handleHttpRequest(ctx, (FullHttpRequest) msg);
- } else if (msg instanceof WebSocketFrame) {
- handleWebSocketFrame(ctx, (WebSocketFrame) msg);
- }
- }
-
- /**
- * Checks if HTTP request method is GET and if is possible to decode HTTP result of request.
- *
- * @param ctx
- * ChannelHandlerContext
- * @param req
- * FullHttpRequest
- */
- private void handleHttpRequest(final ChannelHandlerContext ctx, final FullHttpRequest req) throws Exception {
- // Handle a bad request.
- if (!req.getDecoderResult().isSuccess()) {
- sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, BAD_REQUEST));
- return;
- }
-
- // Allow only GET methods.
- if (req.getMethod() != GET) {
- sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, FORBIDDEN));
- return;
- }
-
- String streamName = Notificator.createStreamNameFromUri(req.getUri());
- ListenerAdapter listener = Notificator.getListenerFor(streamName);
- if (listener != null) {
- listener.addSubscriber(ctx.channel());
- logger.debug("Subscriber successfully registered.");
- } else {
- logger.error("Listener for stream with name '{}' was not found.", streamName);
- sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, INTERNAL_SERVER_ERROR));
- }
-
- // Handshake
- WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory(getWebSocketLocation(req),
- null, false);
- handshaker = wsFactory.newHandshaker(req);
- if (handshaker == null) {
- WebSocketServerHandshakerFactory.sendUnsupportedVersionResponse(ctx.channel());
- } else {
- handshaker.handshake(ctx.channel(), req);
- }
-
- }
-
- /**
- * Checks response status, send response and close connection if necessary
- *
- * @param ctx
- * ChannelHandlerContext
- * @param req
- * HttpRequest
- * @param res
- * FullHttpResponse
- */
- private static void sendHttpResponse(final ChannelHandlerContext ctx, final HttpRequest req,
- final FullHttpResponse res) {
- // Generate an error page if response getStatus code is not OK (200).
- if (res.getStatus().code() != 200) {
- ByteBuf buf = Unpooled.copiedBuffer(res.getStatus().toString(), CharsetUtil.UTF_8);
- res.content().writeBytes(buf);
- buf.release();
- setContentLength(res, res.content().readableBytes());
- }
-
- // Send the response and close the connection if necessary.
- ChannelFuture f = ctx.channel().writeAndFlush(res);
- if (!isKeepAlive(req) || res.getStatus().code() != 200) {
- f.addListener(ChannelFutureListener.CLOSE);
- }
- }
-
- /**
- * Handles web socket frame.
- *
- * @param ctx
- * {@link ChannelHandlerContext}
- * @param frame
- * {@link WebSocketFrame}
- */
- private void handleWebSocketFrame(final ChannelHandlerContext ctx, final WebSocketFrame frame) throws IOException {
- if (frame instanceof CloseWebSocketFrame) {
- handshaker.close(ctx.channel(), (CloseWebSocketFrame) frame.retain());
- String streamName = Notificator.createStreamNameFromUri(((CloseWebSocketFrame) frame).reasonText());
- ListenerAdapter listener = Notificator.getListenerFor(streamName);
- if (listener != null) {
- listener.removeSubscriber(ctx.channel());
- logger.debug("Subscriber successfully registered.");
- }
- Notificator.removeListenerIfNoSubscriberExists(listener);
- return;
- } else if (frame instanceof PingWebSocketFrame) {
- ctx.channel().write(new PongWebSocketFrame(frame.content().retain()));
- return;
- }
- }
-
- @Override
- public void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause) throws Exception {
- if (cause instanceof java.nio.channels.ClosedChannelException == false) {
- // cause.printStackTrace();
- }
- ctx.close();
- }
-
- /**
- * Get web socket location from HTTP request.
- *
- * @param req
- * HTTP request from which the location will be returned
- * @return String representation of web socket location.
- */
- private static String getWebSocketLocation(final HttpRequest req) {
- return "ws://" + req.headers().get(HOST) + req.getUri();
- }
-
-}
Code Review / controller.git / blobdiff