| /* |
| * 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.apache.tuweni.devp2p.eth |
| |
| import kotlinx.coroutines.CoroutineScope |
| import kotlinx.coroutines.Dispatchers |
| import org.apache.tuweni.bytes.Bytes |
| import org.apache.tuweni.concurrent.AsyncCompletion |
| import org.apache.tuweni.concurrent.coroutines.asyncCompletion |
| import org.apache.tuweni.rlpx.RLPxService |
| import org.apache.tuweni.rlpx.wire.DisconnectReason |
| import org.apache.tuweni.rlpx.wire.SubProtocolHandler |
| import org.apache.tuweni.rlpx.wire.WireConnection |
| import org.slf4j.LoggerFactory |
| import java.util.WeakHashMap |
| import kotlin.collections.set |
| import kotlin.coroutines.CoroutineContext |
| |
| internal class EthHelloHandler( |
| override val coroutineContext: CoroutineContext = Dispatchers.Default, |
| private val blockchainInfo: BlockchainInformation, |
| private val service: RLPxService, |
| private val controller: EthHelloController |
| ) : SubProtocolHandler, CoroutineScope { |
| |
| private val pendingStatus = WeakHashMap<String, PeerInfo>() |
| |
| companion object { |
| val logger = LoggerFactory.getLogger(EthHandler::class.java)!! |
| } |
| |
| override fun handle(connection: WireConnection, messageType: Int, message: Bytes) = asyncCompletion { |
| logger.debug("Receiving message of type {}", messageType) |
| when (messageType) { |
| MessageType.Status.code -> handleStatus(connection, StatusMessage.read(message)) |
| else -> { |
| service.disconnect(connection, DisconnectReason.CLIENT_QUITTING) |
| } |
| } |
| } |
| |
| private suspend fun handleStatus(connection: WireConnection, status: StatusMessage) { |
| logger.debug("Received status message {}", status) |
| val peerInfo = pendingStatus.remove(connection.uri()) |
| if (peerInfo == null) { |
| peerInfo?.cancel() |
| service.disconnect(connection, DisconnectReason.SUBPROTOCOL_REASON) |
| } else { |
| peerInfo.complete() |
| controller.receiveStatus(connection, status.toStatus()) |
| } |
| } |
| |
| override fun handleNewPeerConnection(connection: WireConnection): AsyncCompletion { |
| val newPeer = PeerInfo() |
| pendingStatus[connection.uri()] = newPeer |
| val ethSubProtocol = connection.agreedSubprotocols().firstOrNull() { it.name() == EthSubprotocol.ETH66.name() } |
| if (ethSubProtocol == null) { |
| newPeer.cancel() |
| return newPeer.ready |
| } |
| val forkId = |
| blockchainInfo.getLastestApplicableFork(0L) |
| service.send( |
| ethSubProtocol, MessageType.Status.code, connection, |
| StatusMessage( |
| ethSubProtocol.version(), |
| blockchainInfo.networkID(), blockchainInfo.totalDifficulty(), |
| blockchainInfo.bestHash(), blockchainInfo.genesisHash(), forkId.hash, |
| forkId.next |
| ).toBytes() |
| ) |
| |
| return newPeer.ready |
| } |
| |
| override fun stop() = asyncCompletion { |
| } |
| } |