org.glowroot.agent.plugin.netty.Http2ServerHandler.java Source code

Introduction

Here is the source code for org.glowroot.agent.plugin.netty.Http2ServerHandler.java

Source

/*
 * Copyright 2018 the original author or authors.
 *
 * 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 org.glowroot.agent.plugin.netty;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http2.DefaultHttp2Headers;
import io.netty.handler.codec.http2.Http2ConnectionDecoder;
import io.netty.handler.codec.http2.Http2ConnectionEncoder;
import io.netty.handler.codec.http2.Http2ConnectionHandler;
import io.netty.handler.codec.http2.Http2Exception;
import io.netty.handler.codec.http2.Http2Flags;
import io.netty.handler.codec.http2.Http2FrameListener;
import io.netty.handler.codec.http2.Http2Headers;
import io.netty.handler.codec.http2.Http2Settings;

import static io.netty.handler.codec.http.HttpResponseStatus.OK;

public final class Http2ServerHandler extends Http2ConnectionHandler implements Http2FrameListener {

    private static final byte[] CONTENT = { 'H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd' };

    Http2ServerHandler(Http2ConnectionDecoder decoder, Http2ConnectionEncoder encoder,
            Http2Settings initialSettings) {
        super(decoder, encoder, initialSettings);
    }

    @Override
    public int onDataRead(ChannelHandlerContext ctx, int streamId, ByteBuf data, int padding, boolean endOfStream) {
        int processed = data.readableBytes() + padding;
        if (endOfStream) {
            sendResponse(ctx, streamId, data.retain());
        }
        return processed;
    }

    @Override
    public void onHeadersRead(ChannelHandlerContext ctx, int streamId, Http2Headers headers, int streamDependency,
            short weight, boolean exclusive, int padding, boolean endOfStream) {
        onHeadersRead(ctx, streamId, headers, padding, endOfStream);
    }

    @Override
    public void onHeadersRead(ChannelHandlerContext ctx, int streamId, Http2Headers headers, int padding,
            boolean endOfStream) {
        if (endOfStream) {
            ByteBuf content = ctx.alloc().buffer();
            content.writeBytes(CONTENT);
            sendResponse(ctx, streamId, content);
        }
    }

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

    @Override
    public void onPriorityRead(ChannelHandlerContext ctx, int streamId, int streamDependency, short weight,
            boolean exclusive) {
    }

    @Override
    public void onRstStreamRead(ChannelHandlerContext ctx, int streamId, long errorCode) {
    }

    @Override
    public void onSettingsAckRead(ChannelHandlerContext ctx) throws Http2Exception {
    }

    @Override
    public void onSettingsRead(ChannelHandlerContext ctx, Http2Settings settings) {
    }

    // since 4.1.22
    public void onPingRead(ChannelHandlerContext ctx, long data) {
    }

    // prior to 4.1.22
    public void onPingRead(@SuppressWarnings("unused") ChannelHandlerContext ctx,
            @SuppressWarnings("unused") ByteBuf data) {
    }

    // since 4.1.22
    public void onPingAckRead(ChannelHandlerContext ctx, long data) {
    }

    // prior to 4.1.22
    public void onPingAckRead(@SuppressWarnings("unused") ChannelHandlerContext ctx,
            @SuppressWarnings("unused") ByteBuf data) {
    }

    @Override
    public void onPushPromiseRead(ChannelHandlerContext ctx, int streamId, int promisedStreamId,
            Http2Headers headers, int padding) {
    }

    @Override
    public void onGoAwayRead(ChannelHandlerContext ctx, int lastStreamId, long errorCode, ByteBuf debugData) {
    }

    @Override
    public void onWindowUpdateRead(ChannelHandlerContext ctx, int streamId, int windowSizeIncrement) {
    }

    @Override
    public void onUnknownFrame(ChannelHandlerContext ctx, byte frameType, int streamId, Http2Flags flags,
            ByteBuf payload) {
    }

    private void sendResponse(ChannelHandlerContext ctx, int streamId, ByteBuf payload) {
        Http2Headers headers = new DefaultHttp2Headers().status(OK.codeAsText());
        encoder().writeHeaders(ctx, streamId, headers, 0, false, ctx.newPromise());
        encoder().writeData(ctx, streamId, payload, 0, true, ctx.newPromise());
    }
}