108 lines
3.8 KiB
Kotlin
108 lines
3.8 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.repository
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import ch.dissem.bitmessage.extensions.pow.ProofOfWorkRequest
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import ch.dissem.bitmessage.repository.JdbcConfig
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import ch.dissem.bitmessage.repository.JdbcHelper
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import ch.dissem.bitmessage.utils.UnixTime
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import java.util.*
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/**
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* @author Christian Basler
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*/
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class ServerProofOfWorkRepository(config: JdbcConfig) : JdbcHelper(config) {
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fun getIncompleteTasks(): List<Task> {
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config.getConnection().use { connection ->
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val result = LinkedList<Task>()
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val rs = connection.createStatement().executeQuery(
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"SELECT initial_hash, target FROM ProofOfWorkTask WHERE nonce IS NULL")
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while (rs.next()) {
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result.add(Task(
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rs.getBytes(1),
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rs.getBytes(2)
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))
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}
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return result
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}
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}
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/**
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* client (can be removed once the new IV is returned)
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* IV (without nonce)
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* IV (with nonce, can be removed once the new IV is returned)
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* status: calculating, finished, confirmed
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* data (can be removed once POW calculation is done)
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*/
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fun storeTask(request: ProofOfWorkRequest) {
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config.getConnection().use { connection ->
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val ps = connection.prepareStatement(
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"INSERT INTO ProofOfWorkTask (initial_hash, client, target, timestamp) VALUES (?, ?, ?, ?)")
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ps.setBytes(1, request.initialHash)
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ps.setString(2, request.sender.address)
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ps.setBytes(3, request.data)
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ps.setLong(4, UnixTime.now)
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ps.executeUpdate()
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}
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}
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fun updateTask(initalHash: ByteArray, nonce: ByteArray) {
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config.getConnection().use { connection ->
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val ps = connection.prepareStatement(
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"UPDATE ProofOfWorkTask SET nonce = ? WHERE initial_hash = ?")
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ps.setBytes(1, nonce)
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ps.setBytes(2, initalHash)
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ps.executeUpdate()
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}
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}
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fun getNonce(request: ProofOfWorkRequest): ByteArray? {
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config.getConnection().use { connection ->
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val ps = connection.prepareStatement("SELECT nonce FROM ProofOfWorkTask WHERE initial_hash = ?")
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ps.setBytes(1, request.initialHash)
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val rs = ps.executeQuery()
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return if (rs.next()) {
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rs.getBytes(1)
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} else {
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null
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}
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}
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}
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fun hasTask(initialHash: ByteArray): Boolean {
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config.getConnection().use { connection ->
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val ps = connection.prepareStatement("SELECT count(1) FROM ProofOfWorkTask WHERE initial_hash = ?")
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ps.setBytes(1, initialHash)
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val rs = ps.executeQuery()
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rs.next()
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return rs.getInt(1) > 0
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}
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}
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fun cleanupTasks(ageInSeconds: Long) {
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config.getConnection().use { connection ->
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val ps = connection.prepareStatement(
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"DELETE FROM ProofOfWorkTask WHERE timestamp < ?")
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ps.setLong(1, UnixTime.now - ageInSeconds)
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ps.executeUpdate()
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}
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}
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class Task internal constructor(val initialHash: ByteArray, val target: ByteArray)
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}
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