114 lines
4.0 KiB
Kotlin
114 lines
4.0 KiB
Kotlin
/*
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* Copyright 2017 Christian Basler
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package ch.dissem.bitmessage.networking.nio
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import ch.dissem.bitmessage.BitmessageContext
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import ch.dissem.bitmessage.InternalContext
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import ch.dissem.bitmessage.entity.*
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import ch.dissem.bitmessage.entity.valueobject.NetworkAddress
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import ch.dissem.bitmessage.exception.NodeException
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import ch.dissem.bitmessage.utils.UnixTime
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import org.slf4j.LoggerFactory
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/**
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* Handles the initialization phase of connection and, due to their design, custom commands.
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*/
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class NetworkConnectionInitializer(
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private val ctx: InternalContext,
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val node: NetworkAddress,
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val mode: Connection.Mode,
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val send: (MessagePayload) -> Unit,
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val markActive: (LongArray) -> Unit
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) {
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private lateinit var version: Version
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private var verackSent: Boolean = false
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private var verackReceived: Boolean = false
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fun start() {
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if (mode == Connection.Mode.CLIENT || mode == Connection.Mode.SYNC) {
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send(Version(nonce = ctx.clientNonce, addrFrom = NetworkAddress.ANY, addrRecv = node, userAgent = ctx.preferences.userAgent))
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}
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}
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fun handleCommand(payload: MessagePayload) {
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when (payload.command) {
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MessagePayload.Command.VERSION -> handleVersion(payload as Version)
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MessagePayload.Command.VERACK -> {
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if (verackSent) {
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activateConnection()
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}
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verackReceived = true
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}
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MessagePayload.Command.CUSTOM -> {
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ctx.customCommandHandler.handle(payload as CustomMessage)?.let { response ->
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send(response)
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} ?: throw NodeException("No response for custom command available")
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}
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else -> throw NodeException("Command 'version' or 'verack' expected, but was '${payload.command}'")
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}
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}
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private fun handleVersion(version: Version) {
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if (version.nonce == ctx.clientNonce) {
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throw NodeException("Tried to connect to self, disconnecting.")
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} else if (version.version >= BitmessageContext.CURRENT_VERSION) {
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this.version = version
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verackSent = true
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send(VerAck())
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if (mode == Connection.Mode.SERVER) {
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send(Version.Builder().defaults(ctx.clientNonce).addrFrom(NetworkAddress.ANY).addrRecv(node).build())
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}
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if (verackReceived) {
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activateConnection()
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}
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} else {
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throw NodeException("Received unsupported version ${version.version}, disconnecting.")
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}
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}
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private fun activateConnection() {
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LOG.info("Successfully established connection with node $node")
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markActive(version.streams)
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node.time = UnixTime.now
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if (mode != Connection.Mode.SYNC) {
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sendAddresses()
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ctx.nodeRegistry.offerAddresses(listOf(node))
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}
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sendInventory()
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}
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private fun sendAddresses() {
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val addresses = ctx.nodeRegistry.getKnownAddresses(1000, *version.streams)
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send(Addr(addresses))
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}
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private fun sendInventory() {
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val inventory = ctx.inventory.getInventory(*version.streams)
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var i = 0
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while (i < inventory.size) {
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send(Inv(inventory.subList(i, Math.min(inventory.size, i + 50000))))
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i += 50000
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}
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}
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companion object {
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val LOG = LoggerFactory.getLogger(NetworkConnectionInitializer::class.java)!!
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}
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}
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