org.jooby.internal.netty.NettyPush.java Source code

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Here is the source code for org.jooby.internal.netty.NettyPush.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 org.jooby.internal.netty;

import java.util.Map;

import org.jooby.spi.NativePushPromise;

import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http.DefaultFullHttpRequest;
import io.netty.handler.codec.http.DefaultHttpHeaders;
import io.netty.handler.codec.http.EmptyHttpHeaders;
import io.netty.handler.codec.http.HttpMethod;
import io.netty.handler.codec.http.HttpVersion;
import io.netty.handler.codec.http2.DefaultHttp2Headers;
import io.netty.handler.codec.http2.Http2Connection;
import io.netty.handler.codec.http2.Http2ConnectionEncoder;
import io.netty.handler.codec.http2.Http2Headers;
import io.netty.handler.codec.http2.HttpConversionUtil;
import io.netty.handler.codec.http2.HttpToHttp2ConnectionHandler;
import io.netty.util.AsciiString;

public class NettyPush implements NativePushPromise {

    private ChannelHandlerContext ctx;

    private Http2ConnectionEncoder encoder;

    private int streamId;

    private String authority;

    private String scheme;

    public NettyPush(final ChannelHandlerContext ctx, final int streamId, final String authority,
            final String scheme) {
        this.ctx = ctx;
        HttpToHttp2ConnectionHandler handler = ctx.pipeline().get(HttpToHttp2ConnectionHandler.class);
        this.encoder = handler.encoder();
        this.streamId = streamId;
        this.authority = authority;
        this.scheme = scheme;
    }

    @Override
    public void push(final String method, final String path, final Map<String, Object> headers) {
        ctx.channel().eventLoop().execute(() -> {
            AsciiString streamIdHeader = HttpConversionUtil.ExtensionHeaderNames.STREAM_ID.text();
            Http2Connection connection = encoder.connection();
            int nextStreamId = connection.local().incrementAndGetNextStreamId();
            Http2Headers h2headers = new DefaultHttp2Headers().path(path).method(method).authority(authority)
                    .scheme(scheme);
            headers.forEach((n, v) -> h2headers.add(n, v.toString()));
            encoder.writePushPromise(ctx, streamId, nextStreamId, h2headers, 0, ctx.newPromise());

            // TODO: Is there another way of handling a push promise?
            DefaultFullHttpRequest pushRequest = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1,
                    HttpMethod.valueOf(method.toUpperCase()), path, Unpooled.EMPTY_BUFFER,
                    new DefaultHttpHeaders(false).set(streamIdHeader, nextStreamId), EmptyHttpHeaders.INSTANCE);
            ctx.pipeline().fireChannelRead(pushRequest);
            ctx.pipeline().fireChannelReadComplete();
        });
    }

}