123 lines
5.2 KiB
Kotlin
123 lines
5.2 KiB
Kotlin
/*
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* Copyright 2015 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.server
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import ch.dissem.bitmessage.InternalContext
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import ch.dissem.bitmessage.entity.BitmessageAddress
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import ch.dissem.bitmessage.entity.CustomMessage
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import ch.dissem.bitmessage.entity.MessagePayload
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import ch.dissem.bitmessage.entity.valueobject.PrivateKey
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import ch.dissem.bitmessage.exception.DecryptionFailedException
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import ch.dissem.bitmessage.extensions.CryptoCustomMessage
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import ch.dissem.bitmessage.extensions.pow.ProofOfWorkRequest
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import ch.dissem.bitmessage.extensions.pow.ProofOfWorkRequest.Request.CALCULATING
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import ch.dissem.bitmessage.extensions.pow.ProofOfWorkRequest.Request.COMPLETE
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import ch.dissem.bitmessage.ports.CustomCommandHandler
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import ch.dissem.bitmessage.ports.ProofOfWorkEngine
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import ch.dissem.bitmessage.server.repository.ServerProofOfWorkRepository
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import ch.dissem.bitmessage.utils.UnixTime.DAY
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import org.slf4j.LoggerFactory
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import java.util.*
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import kotlin.concurrent.schedule
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/**
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* @author Christian Basler
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*/
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class ProofOfWorkRequestHandler(private val repo: ServerProofOfWorkRepository, clients: Collection<BitmessageAddress>) : CustomCommandHandler, InternalContext.ContextHolder {
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private val decryptionKeys = clients.map { it.publicDecryptionKey }
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private lateinit var engine: ProofOfWorkEngine
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private lateinit var context: InternalContext
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private val identity: BitmessageAddress by lazy {
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context.addressRepository.getIdentities().firstOrNull() ?: BitmessageAddress(PrivateKey(
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false,
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context.streams[0],
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InternalContext.NETWORK_NONCE_TRIALS_PER_BYTE,
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InternalContext.NETWORK_EXTRA_BYTES
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)).also { context.addressRepository.save(it) }
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}
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init {
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Timer().schedule(15000) {
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doMissingProofOfWork()
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} // wait 15 seconds
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Timer().schedule(60000, DAY * 1000) {
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repo.cleanupTasks(7 * DAY)
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} // First time after 1 minute, then daily
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}
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fun doMissingProofOfWork() {
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val incompleteTasks = repo.getIncompleteTasks()
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LOG.info("Doing POW for ${incompleteTasks.size} tasks.")
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for (task in incompleteTasks) {
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engine.calculateNonce(task.initialHash, task.target) { initalHash, nonce -> repo.updateTask(initalHash, nonce) }
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}
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}
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override fun handle(request: CustomMessage): MessagePayload? {
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val cryptoMessage = CryptoCustomMessage.read(request) { client, input ->
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ProofOfWorkRequest.read(client, input)
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}
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val decryptedRequest = decrypt(cryptoMessage) ?: return CustomMessage.error(
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"Unknown sender. Please ask the server's administrator to add you as a client. For this he'll need your identity."
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)
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when (decryptedRequest.request) {
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ProofOfWorkRequest.Request.CALCULATE -> {
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if (!repo.hasTask(decryptedRequest.initialHash)) {
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repo.storeTask(decryptedRequest)
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// TODO: This is probably the place to do some book-keeping
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// if we want to bill our customers.
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engine.calculateNonce(decryptedRequest.initialHash, decryptedRequest.data) { initalHash, nonce -> repo.updateTask(initalHash, nonce) }
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return CryptoCustomMessage(
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ProofOfWorkRequest(identity, decryptedRequest.initialHash, CALCULATING, ByteArray(0))
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)
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} else {
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val nonce = repo.getNonce(decryptedRequest)
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return CryptoCustomMessage(
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if (nonce != null) {
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ProofOfWorkRequest(identity, decryptedRequest.initialHash, COMPLETE, nonce)
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} else {
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ProofOfWorkRequest(identity, decryptedRequest.initialHash, CALCULATING, ByteArray(0))
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}
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).apply { signAndEncrypt(identity, decryptedRequest.sender.pubkey!!.encryptionKey) }
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}
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}
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else -> return null
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}
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}
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private fun decrypt(cryptoMessage: CryptoCustomMessage<ProofOfWorkRequest>): ProofOfWorkRequest? {
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for (key in decryptionKeys) {
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try {
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return cryptoMessage.decrypt(key)
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} catch (_: DecryptionFailedException) {
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}
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}
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return null
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}
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override fun setContext(context: InternalContext) {
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this.context = context
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this.engine = context.proofOfWorkEngine
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}
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companion object {
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private val LOG = LoggerFactory.getLogger(ProofOfWorkRequestHandler::class.java)
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}
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}
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