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Core components supporting the Micronaut Framework

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/*
 * Copyright 2017-2024 original 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
 *
 * https://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.micronaut.http.client.netty;

import io.micronaut.core.annotation.Internal;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http2.DefaultHttp2PingFrame;
import io.netty.handler.timeout.IdleStateEvent;
import io.netty.handler.timeout.IdleStateHandler;

import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;

/**
 * IdleStateHandler that automatically sends HTTP/2 ping frames on timeout.
 *
 * @since 4.6.0
 * @author Jonas Konrad
 */
@Internal
final class Http2PingSender extends IdleStateHandler {
    public Http2PingSender(long readerIdleTime, long writerIdleTime, long allIdleTime, TimeUnit unit) {
        super(readerIdleTime, writerIdleTime, allIdleTime, unit);
    }

    @Override
    protected void channelIdle(ChannelHandlerContext ctx, IdleStateEvent evt) {
        resetReadTimeout();
        resetWriteTimeout();

        ctx.writeAndFlush(new DefaultHttp2PingFrame(ThreadLocalRandom.current().nextLong()), ctx.voidPromise());
    }
}