/* * Copyright ConsenSys AG. * * 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. * * SPDX-License-Identifier: Apache-2.0 */ package org.hyperledger.besu.ethereum.p2p.rlpx.connections.netty; import org.hyperledger.besu.ethereum.p2p.rlpx.connections.PeerConnection; import org.hyperledger.besu.ethereum.p2p.rlpx.wire.messages.DisconnectMessage; import org.hyperledger.besu.ethereum.p2p.rlpx.wire.messages.PingMessage; import java.io.IOException; import java.util.concurrent.atomic.AtomicBoolean; import io.netty.channel.ChannelDuplexHandler; import io.netty.channel.ChannelHandlerContext; import io.netty.handler.timeout.IdleState; import io.netty.handler.timeout.IdleStateEvent; import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.Logger; final class WireKeepAlive extends ChannelDuplexHandler { private static final Logger LOG = LogManager.getLogger(); private final AtomicBoolean waitingForPong; private final PeerConnection connection; WireKeepAlive(final PeerConnection connection, final AtomicBoolean waitingForPong) { this.connection = connection; this.waitingForPong = waitingForPong; } @Override public void userEventTriggered(final ChannelHandlerContext ctx, final Object evt) throws IOException { if (!(evt instanceof IdleStateEvent && ((IdleStateEvent) evt).state() == IdleState.READER_IDLE)) { // We only care about idling of incoming data from our peer return; } if (waitingForPong.get()) { // We are still waiting for a response from our last pong, disconnect with timeout error LOG.debug("Wire PONG never received, disconnecting from peer."); connection.disconnect(DisconnectMessage.DisconnectReason.TIMEOUT); return; } try { LOG.debug("Idle connection detected, sending Wire PING to peer."); connection.send(null, PingMessage.get()); waitingForPong.set(true); } catch (final PeerConnection.PeerNotConnected ignored) { LOG.trace("PING not sent because peer is already disconnected"); } } }