/*
* Copyright 2014 Netflix, 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 io.reactivex.netty.protocol.http.sse;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelOutboundHandlerAdapter;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.ChannelPromise;
import io.reactivex.netty.pipeline.PipelineConfigurator;
import io.reactivex.netty.protocol.http.server.HttpServerPipelineConfigurator;
import io.reactivex.netty.protocol.http.server.HttpServerRequest;
import io.reactivex.netty.protocol.http.server.HttpServerResponse;
import io.reactivex.netty.protocol.text.sse.SSEServerPipelineConfigurator;
import io.reactivex.netty.protocol.text.sse.ServerSentEvent;
import io.reactivex.netty.protocol.text.sse.ServerSentEventEncoder;
import static io.netty.handler.codec.http.HttpHeaders.Names.CONTENT_TYPE;
import static io.reactivex.netty.protocol.text.sse.SSEServerPipelineConfigurator.SERVER_SENT_EVENT_ENCODER;
import static io.reactivex.netty.protocol.text.sse.SSEServerPipelineConfigurator.SSE_ENCODER_HANDLER_NAME;
/**
* An extension to {@link SSEServerPipelineConfigurator} that enables SSE over HTTP. <br/>
*
* @see ServerSentEventEncoder
*
* @author Nitesh Kant
*/
public class SseOverHttpServerPipelineConfigurator<I>
implements PipelineConfigurator<HttpServerRequest<I>, HttpServerResponse<ServerSentEvent>> {
public static final String SSE_RESPONSE_HEADERS_COMPLETER = "sse-response-headers-completer";
private final HttpServerPipelineConfigurator<I, ?> serverPipelineConfigurator;
public SseOverHttpServerPipelineConfigurator() {
this(new HttpServerPipelineConfigurator<I, Object>());
}
public SseOverHttpServerPipelineConfigurator(HttpServerPipelineConfigurator<I, ?> serverPipelineConfigurator) {
this.serverPipelineConfigurator = serverPipelineConfigurator;
}
@Override
public void configureNewPipeline(ChannelPipeline pipeline) {
serverPipelineConfigurator.configureNewPipeline(pipeline);
pipeline.addLast(SSE_ENCODER_HANDLER_NAME, SERVER_SENT_EVENT_ENCODER);
pipeline.addLast(SSE_RESPONSE_HEADERS_COMPLETER, new ChannelOutboundHandlerAdapter() {
@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
if (HttpServerResponse.class.isAssignableFrom(msg.getClass())) {
@SuppressWarnings("rawtypes")
HttpServerResponse rxResponse = (HttpServerResponse) msg;
String contentTypeHeader = rxResponse.getHeaders().get(CONTENT_TYPE);
if (null == contentTypeHeader) {
rxResponse.getHeaders().set(CONTENT_TYPE, "text/event-stream");
}
}
super.write(ctx, msg, promise);
}
});
}
}