660 lines
24 KiB
Swift
660 lines
24 KiB
Swift
//
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// SDKSynchronizer.swift
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// ZcashLightClientKit
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//
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// Created by Francisco Gindre on 11/6/19.
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// Copyright © 2019 Electric Coin Company. All rights reserved.
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//
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import Foundation
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import Combine
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/// Synchronizer implementation for UIKit and iOS 13+
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// swiftlint:disable type_body_length
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public class SDKSynchronizer: Synchronizer {
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public var alias: ZcashSynchronizerAlias { initializer.alias }
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private lazy var streamsUpdateQueue = { DispatchQueue(label: "streamsUpdateQueue_\(initializer.alias.description)") }()
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private let stateSubject = CurrentValueSubject<SynchronizerState, Never>(.zero)
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public var stateStream: AnyPublisher<SynchronizerState, Never> { stateSubject.eraseToAnyPublisher() }
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public private(set) var latestState: SynchronizerState = .zero
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private let eventSubject = PassthroughSubject<SynchronizerEvent, Never>()
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public var eventStream: AnyPublisher<SynchronizerEvent, Never> { eventSubject.eraseToAnyPublisher() }
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public let metrics: SDKMetrics
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public let logger: Logger
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// Don't read this variable directly. Use `status` instead. And don't update this variable directly use `updateStatus()` methods instead.
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private var underlyingStatus: GenericActor<SyncStatus>
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var status: SyncStatus {
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get async { await underlyingStatus.value }
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}
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let blockProcessor: CompactBlockProcessor
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lazy var blockProcessorEventProcessingQueue = { DispatchQueue(label: "blockProcessorEventProcessingQueue_\(initializer.alias.description)") }()
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public let initializer: Initializer
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public var connectionState: ConnectionState
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public let network: ZcashNetwork
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private let transactionEncoder: TransactionEncoder
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private let transactionRepository: TransactionRepository
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private let utxoRepository: UnspentTransactionOutputRepository
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private let syncSessionIDGenerator: SyncSessionIDGenerator
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private let syncSession: SyncSession
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private let syncSessionTicker: SessionTicker
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private var syncStartDate: Date?
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let latestBlocksDataProvider: LatestBlocksDataProvider
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/// Creates an SDKSynchronizer instance
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/// - Parameter initializer: a wallet Initializer object
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public convenience init(initializer: Initializer) {
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self.init(
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status: .unprepared,
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initializer: initializer,
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transactionEncoder: WalletTransactionEncoder(initializer: initializer),
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transactionRepository: initializer.transactionRepository,
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utxoRepository: UTXORepositoryBuilder.build(initializer: initializer),
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blockProcessor: CompactBlockProcessor(
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initializer: initializer,
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walletBirthdayProvider: { initializer.walletBirthday }
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),
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syncSessionTicker: .live
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)
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}
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init(
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status: SyncStatus,
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initializer: Initializer,
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transactionEncoder: TransactionEncoder,
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transactionRepository: TransactionRepository,
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utxoRepository: UnspentTransactionOutputRepository,
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blockProcessor: CompactBlockProcessor,
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syncSessionTicker: SessionTicker
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) {
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self.connectionState = .idle
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self.underlyingStatus = GenericActor(status)
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self.initializer = initializer
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self.transactionEncoder = transactionEncoder
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self.transactionRepository = transactionRepository
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self.utxoRepository = utxoRepository
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self.blockProcessor = blockProcessor
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self.network = initializer.network
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self.metrics = initializer.container.resolve(SDKMetrics.self)
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self.logger = initializer.logger
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self.syncSessionIDGenerator = initializer.container.resolve(SyncSessionIDGenerator.self)
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self.syncSession = SyncSession(.nullID)
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self.syncSessionTicker = syncSessionTicker
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self.latestBlocksDataProvider = initializer.container.resolve(LatestBlocksDataProvider.self)
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initializer.lightWalletService.connectionStateChange = { [weak self] oldState, newState in
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self?.connectivityStateChanged(oldState: oldState, newState: newState)
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}
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Task(priority: .high) { [weak self] in await self?.subscribeToProcessorEvents(blockProcessor) }
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}
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deinit {
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UsedAliasesChecker.stopUsing(alias: initializer.alias, id: initializer.id)
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Task { [blockProcessor] in
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await blockProcessor.stop()
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}
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}
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func updateStatus(_ newValue: SyncStatus) async {
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let oldValue = await underlyingStatus.update(newValue)
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await notify(oldStatus: oldValue, newStatus: newValue)
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}
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func throwIfUnprepared() throws {
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if !latestState.syncStatus.isPrepared {
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throw ZcashError.synchronizerNotPrepared
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}
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}
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func checkIfCanContinueInitialisation() -> ZcashError? {
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if let initialisationError = initializer.urlsParsingError {
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return initialisationError
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}
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if !UsedAliasesChecker.tryToUse(alias: initializer.alias, id: initializer.id) {
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return .initializerAliasAlreadyInUse(initializer.alias)
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}
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return nil
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}
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public func prepare(
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with seed: [UInt8]?,
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viewingKeys: [UnifiedFullViewingKey],
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walletBirthday: BlockHeight
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) async throws -> Initializer.InitializationResult {
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guard await status == .unprepared else { return .success }
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if let error = checkIfCanContinueInitialisation() {
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throw error
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}
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try await utxoRepository.initialise()
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if case .seedRequired = try await self.initializer.initialize(with: seed, viewingKeys: viewingKeys, walletBirthday: walletBirthday) {
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return .seedRequired
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}
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await latestBlocksDataProvider.updateWalletBirthday(initializer.walletBirthday)
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await latestBlocksDataProvider.updateScannedData()
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await updateStatus(.disconnected)
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return .success
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}
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/// Starts the synchronizer
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/// - Throws: ZcashError when failures occur
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public func start(retry: Bool = false) async throws {
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switch await status {
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case .unprepared:
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throw ZcashError.synchronizerNotPrepared
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case .syncing, .enhancing, .fetching:
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logger.warn("warning: Synchronizer started when already running. Next sync process will be started when the current one stops.")
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/// This may look strange but `CompactBlockProcessor` has mechanisms which can handle this situation. So we are fine with calling
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/// it's start here.
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await blockProcessor.start(retry: retry)
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case .stopped, .synced, .disconnected, .error:
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await updateStatus(.syncing(.nullProgress))
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syncStartDate = Date()
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await blockProcessor.start(retry: retry)
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}
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}
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/// Stops the synchronizer
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public func stop() {
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// Calling `await blockProcessor.stop()` make take some time. If the downloading of blocks is in progress then this method inside waits until
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// downloading is really done. Which could block execution of the code on the client side. So it's better strategy to spin up new task and
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// exit fast on client side.
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Task(priority: .high) {
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let status = await self.status
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guard status != .stopped, status != .disconnected else {
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logger.info("attempted to stop when status was: \(status)")
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return
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}
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await blockProcessor.stop()
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}
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}
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// MARK: Connectivity State
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func connectivityStateChanged(oldState: ConnectionState, newState: ConnectionState) {
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connectionState = newState
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streamsUpdateQueue.async { [weak self] in
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self?.eventSubject.send(.connectionStateChanged(newState))
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}
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}
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// MARK: Handle CompactBlockProcessor.Flow
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private func subscribeToProcessorEvents(_ processor: CompactBlockProcessor) async {
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let eventClosure: CompactBlockProcessor.EventClosure = { [weak self] event in
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switch event {
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case let .failed(error):
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await self?.failed(error: error)
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case let .finished(height, foundBlocks):
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await self?.finished(lastScannedHeight: height, foundBlocks: foundBlocks)
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case let .foundTransactions(transactions, range):
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self?.foundTransactions(transactions: transactions, in: range)
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case let .handledReorg(reorgHeight, rewindHeight):
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// log reorg information
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self?.logger.info("handling reorg at: \(reorgHeight) with rewind height: \(rewindHeight)")
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case let .progressUpdated(progress):
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await self?.progressUpdated(progress: progress)
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case let .storedUTXOs(utxos):
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self?.storedUTXOs(utxos: utxos)
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case .startedEnhancing:
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await self?.updateStatus(.enhancing(.zero))
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case .startedFetching:
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await self?.updateStatus(.fetching)
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case .startedSyncing:
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await self?.updateStatus(.syncing(.nullProgress))
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case .stopped:
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await self?.updateStatus(.stopped)
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}
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}
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await processor.updateEventClosure(identifier: "SDKSynchronizer", closure: eventClosure)
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}
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private func failed(error: Error) async {
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await updateStatus(.error(error))
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}
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private func finished(lastScannedHeight: BlockHeight, foundBlocks: Bool) async {
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await latestBlocksDataProvider.updateScannedData()
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await updateStatus(.synced)
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if let syncStartDate {
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metrics.pushSyncReport(
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start: syncStartDate,
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end: Date()
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)
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}
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}
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private func foundTransactions(transactions: [ZcashTransaction.Overview], in range: CompactBlockRange) {
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streamsUpdateQueue.async { [weak self] in
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self?.eventSubject.send(.foundTransactions(transactions, range))
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}
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}
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private func progressUpdated(progress: CompactBlockProgress) async {
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let newStatus = SyncStatus(progress)
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await updateStatus(newStatus)
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}
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private func storedUTXOs(utxos: (inserted: [UnspentTransactionOutputEntity], skipped: [UnspentTransactionOutputEntity])) {
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streamsUpdateQueue.async { [weak self] in
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self?.eventSubject.send(.storedUTXOs(utxos.inserted, utxos.skipped))
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}
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}
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// MARK: Synchronizer methods
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public func sendToAddress(
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spendingKey: UnifiedSpendingKey,
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zatoshi: Zatoshi,
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toAddress: Recipient,
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memo: Memo?
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) async throws -> ZcashTransaction.Overview {
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try throwIfUnprepared()
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if case Recipient.transparent = toAddress, memo != nil {
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throw ZcashError.synchronizerSendMemoToTransparentAddress
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}
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try await SaplingParameterDownloader.downloadParamsIfnotPresent(
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spendURL: initializer.spendParamsURL,
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spendSourceURL: initializer.saplingParamsSourceURL.spendParamFileURL,
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outputURL: initializer.outputParamsURL,
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outputSourceURL: initializer.saplingParamsSourceURL.outputParamFileURL,
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logger: logger
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)
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return try await createToAddress(
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spendingKey: spendingKey,
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zatoshi: zatoshi,
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recipient: toAddress,
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memo: memo
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)
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}
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public func shieldFunds(
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spendingKey: UnifiedSpendingKey,
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memo: Memo,
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shieldingThreshold: Zatoshi
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) async throws -> ZcashTransaction.Overview {
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try throwIfUnprepared()
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// let's see if there are funds to shield
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let accountIndex = Int(spendingKey.account)
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let tBalance = try await self.getTransparentBalance(accountIndex: accountIndex)
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// Verify that at least there are funds for the fee. Ideally this logic will be improved by the shielding wallet.
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guard tBalance.verified >= self.network.constants.defaultFee(for: await self.latestBlocksDataProvider.latestScannedHeight) else {
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throw ZcashError.synchronizerShieldFundsInsuficientTransparentFunds
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}
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let transaction = try await transactionEncoder.createShieldingTransaction(
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spendingKey: spendingKey,
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shieldingThreshold: shieldingThreshold,
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memoBytes: memo.asMemoBytes(),
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from: Int(spendingKey.account)
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)
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let encodedTx = try transaction.encodedTransaction()
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try await transactionEncoder.submit(transaction: encodedTx)
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return transaction
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}
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func createToAddress(
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spendingKey: UnifiedSpendingKey,
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zatoshi: Zatoshi,
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recipient: Recipient,
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memo: Memo?
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) async throws -> ZcashTransaction.Overview {
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do {
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if
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case .transparent = recipient,
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memo != nil {
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throw ZcashError.synchronizerSendMemoToTransparentAddress
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}
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let transaction = try await transactionEncoder.createTransaction(
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spendingKey: spendingKey,
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zatoshi: zatoshi,
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to: recipient.stringEncoded,
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memoBytes: memo?.asMemoBytes(),
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from: Int(spendingKey.account)
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)
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let encodedTransaction = try transaction.encodedTransaction()
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try await transactionEncoder.submit(transaction: encodedTransaction)
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return transaction
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} catch {
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throw error
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}
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}
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public func allReceivedTransactions() async throws -> [ZcashTransaction.Overview] {
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try await transactionRepository.findReceived(offset: 0, limit: Int.max)
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}
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public func allPendingTransactions() async throws -> [ZcashTransaction.Overview] {
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let latestScannedHeight = self.latestState.latestScannedHeight
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return try await transactionRepository.findPendingTransactions(latestHeight: latestScannedHeight, offset: 0, limit: .max)
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}
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public func allTransactions() async throws -> [ZcashTransaction.Overview] {
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return try await transactionRepository.find(offset: 0, limit: Int.max, kind: .all)
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}
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public func allSentTransactions() async throws -> [ZcashTransaction.Overview] {
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return try await transactionRepository.findSent(offset: 0, limit: Int.max)
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}
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public func allTransactions(from transaction: ZcashTransaction.Overview, limit: Int) async throws -> [ZcashTransaction.Overview] {
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return try await transactionRepository.find(from: transaction, limit: limit, kind: .all)
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}
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public func paginatedTransactions(of kind: TransactionKind = .all) -> PaginatedTransactionRepository {
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PagedTransactionRepositoryBuilder.build(initializer: initializer, kind: .all)
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}
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public func getMemos(for transaction: ZcashTransaction.Overview) async throws -> [Memo] {
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return try await transactionRepository.findMemos(for: transaction)
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}
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public func getRecipients(for transaction: ZcashTransaction.Overview) async -> [TransactionRecipient] {
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return (try? await transactionRepository.getRecipients(for: transaction.id)) ?? []
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}
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public func getTransactionOutputs(for transaction: ZcashTransaction.Overview) async -> [ZcashTransaction.Output] {
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return (try? await transactionRepository.getTransactionOutputs(for: transaction.id)) ?? []
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}
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public func latestHeight() async throws -> BlockHeight {
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try await blockProcessor.blockDownloaderService.latestBlockHeight()
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}
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public func latestUTXOs(address: String) async throws -> [UnspentTransactionOutputEntity] {
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try throwIfUnprepared()
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guard initializer.isValidTransparentAddress(address) else {
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throw ZcashError.synchronizerLatestUTXOsInvalidTAddress
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}
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let stream = initializer.lightWalletService.fetchUTXOs(for: address, height: network.constants.saplingActivationHeight)
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// swiftlint:disable:next array_constructor
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var utxos: [UnspentTransactionOutputEntity] = []
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for try await transactionEntity in stream {
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utxos.append(transactionEntity)
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}
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try await self.utxoRepository.clearAll(address: address)
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try await self.utxoRepository.store(utxos: utxos)
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return utxos
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}
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public func refreshUTXOs(address: TransparentAddress, from height: BlockHeight) async throws -> RefreshedUTXOs {
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try throwIfUnprepared()
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return try await blockProcessor.refreshUTXOs(tAddress: address, startHeight: height)
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}
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public func getShieldedBalance(accountIndex: Int = 0) async throws -> Zatoshi {
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let balance = try await initializer.rustBackend.getBalance(account: Int32(accountIndex))
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return Zatoshi(balance)
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}
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public func getShieldedVerifiedBalance(accountIndex: Int = 0) async throws -> Zatoshi {
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let balance = try await initializer.rustBackend.getVerifiedBalance(account: Int32(accountIndex))
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return Zatoshi(balance)
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}
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public func getUnifiedAddress(accountIndex: Int) async throws -> UnifiedAddress {
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try await blockProcessor.getUnifiedAddress(accountIndex: accountIndex)
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}
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public func getSaplingAddress(accountIndex: Int) async throws -> SaplingAddress {
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try await blockProcessor.getSaplingAddress(accountIndex: accountIndex)
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}
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public func getTransparentAddress(accountIndex: Int) async throws -> TransparentAddress {
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try await blockProcessor.getTransparentAddress(accountIndex: accountIndex)
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}
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/// Returns the last stored transparent balance
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public func getTransparentBalance(accountIndex: Int) async throws -> WalletBalance {
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try await blockProcessor.getTransparentBalance(accountIndex: accountIndex)
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}
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// MARK: Rewind
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public func rewind(_ policy: RewindPolicy) -> AnyPublisher<Void, Error> {
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let subject = PassthroughSubject<Void, Error>()
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Task(priority: .high) {
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if !latestState.syncStatus.isPrepared {
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subject.send(completion: .failure(ZcashError.synchronizerNotPrepared))
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return
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}
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let height: BlockHeight?
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switch policy {
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case .quick:
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height = nil
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case .birthday:
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let birthday = await self.blockProcessor.config.walletBirthday
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height = birthday
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case .height(let rewindHeight):
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height = rewindHeight
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case .transaction(let transaction):
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guard let txHeight = transaction.anchor(network: self.network) else {
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throw ZcashError.synchronizerRewindUnknownArchorHeight
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}
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height = txHeight
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}
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let context = AfterSyncHooksManager.RewindContext(
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height: height,
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completion: { result in
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switch result {
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case .success:
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subject.send(completion: .finished)
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case let .failure(error):
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subject.send(completion: .failure(error))
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}
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}
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)
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await blockProcessor.rewind(context: context)
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}
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return subject.eraseToAnyPublisher()
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}
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// MARK: Wipe
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public func wipe() -> AnyPublisher<Void, Error> {
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let subject = PassthroughSubject<Void, Error>()
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Task(priority: .high) {
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if let error = checkIfCanContinueInitialisation() {
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subject.send(completion: .failure(error))
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return
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}
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let context = AfterSyncHooksManager.WipeContext(
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prewipe: { [weak self] in
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self?.transactionEncoder.closeDBConnection()
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self?.transactionRepository.closeDBConnection()
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},
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completion: { [weak self] possibleError in
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await self?.updateStatus(.unprepared)
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if let error = possibleError {
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subject.send(completion: .failure(error))
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} else {
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subject.send(completion: .finished)
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}
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}
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)
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await blockProcessor.wipe(context: context)
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|
}
|
|
|
|
return subject.eraseToAnyPublisher()
|
|
}
|
|
|
|
// MARK: notify state
|
|
|
|
private func snapshotState(status: SyncStatus) async -> SynchronizerState {
|
|
return await SynchronizerState(
|
|
syncSessionID: syncSession.value,
|
|
shieldedBalance: WalletBalance(
|
|
verified: (try? await getShieldedVerifiedBalance()) ?? .zero,
|
|
total: (try? await getShieldedBalance()) ?? .zero
|
|
),
|
|
transparentBalance: (try? await blockProcessor.getTransparentBalance(accountIndex: 0)) ?? .zero,
|
|
syncStatus: status,
|
|
latestScannedHeight: latestBlocksDataProvider.latestScannedHeight,
|
|
latestBlockHeight: latestBlocksDataProvider.latestBlockHeight,
|
|
latestScannedTime: latestBlocksDataProvider.latestScannedTime
|
|
)
|
|
}
|
|
|
|
private func notify(oldStatus: SyncStatus, newStatus: SyncStatus) async {
|
|
guard oldStatus != newStatus else { return }
|
|
|
|
let newState: SynchronizerState
|
|
|
|
// When the wipe happens status is switched to `unprepared`. And we expect that everything is deleted. All the databases including data DB.
|
|
// When new snapshot is created balance is checked. And when balance is checked and data DB doesn't exist then rust initialise new database.
|
|
// So it's necessary to not create new snapshot after status is switched to `unprepared` otherwise data DB exists after wipe
|
|
if newStatus == .unprepared {
|
|
var nextState = SynchronizerState.zero
|
|
|
|
let nextSessionID = await self.syncSession.update(.nullID)
|
|
|
|
nextState.syncSessionID = nextSessionID
|
|
newState = nextState
|
|
} else {
|
|
if SessionTicker.live.isNewSyncSession(oldStatus, newStatus) {
|
|
await self.syncSession.newSession(with: self.syncSessionIDGenerator)
|
|
}
|
|
newState = await snapshotState(status: newStatus)
|
|
}
|
|
|
|
latestState = newState
|
|
updateStateStream(with: latestState)
|
|
}
|
|
|
|
private func updateStateStream(with newState: SynchronizerState) {
|
|
streamsUpdateQueue.async { [weak self] in
|
|
self?.stateSubject.send(newState)
|
|
}
|
|
}
|
|
|
|
private func notifyMinedTransaction(_ transaction: ZcashTransaction.Overview) {
|
|
streamsUpdateQueue.async { [weak self] in
|
|
self?.eventSubject.send(.minedTransaction(transaction))
|
|
}
|
|
}
|
|
}
|
|
|
|
extension SDKSynchronizer {
|
|
public var transactions: [ZcashTransaction.Overview] {
|
|
get async {
|
|
(try? await self.allTransactions()) ?? []
|
|
}
|
|
}
|
|
|
|
public var sentTransactions: [ZcashTransaction.Overview] {
|
|
get async {
|
|
(try? await allSentTransactions()) ?? []
|
|
}
|
|
}
|
|
|
|
public var receivedTransactions: [ZcashTransaction.Overview] {
|
|
get async {
|
|
(try? await allReceivedTransactions()) ?? []
|
|
}
|
|
}
|
|
|
|
public var pendingTransactions: [ZcashTransaction.Overview] {
|
|
get async {
|
|
(try? await allPendingTransactions()) ?? []
|
|
}
|
|
}
|
|
}
|
|
|
|
extension SyncStatus {
|
|
func isDifferent(from otherStatus: SyncStatus) -> Bool {
|
|
switch (self, otherStatus) {
|
|
case (.unprepared, .unprepared): return false
|
|
case (.syncing, .syncing): return false
|
|
case (.enhancing, .enhancing): return false
|
|
case (.fetching, .fetching): return false
|
|
case (.synced, .synced): return false
|
|
case (.stopped, .stopped): return false
|
|
case (.disconnected, .disconnected): return false
|
|
case (.error, .error): return false
|
|
default: return true
|
|
}
|
|
}
|
|
}
|
|
|
|
struct SessionTicker {
|
|
/// Helper function to determine whether we are in front of a SyncSession change for a given syncStatus
|
|
/// transition we consider that every sync attempt is a new sync session and should have it's unique UUID reported.
|
|
var isNewSyncSession: (SyncStatus, SyncStatus) -> Bool
|
|
}
|
|
|
|
extension SessionTicker {
|
|
static let live = SessionTicker { oldStatus, newStatus in
|
|
// if the state hasn't changed to a different syncStatus member
|
|
guard oldStatus.isDifferent(from: newStatus) else { return false }
|
|
|
|
switch (oldStatus, newStatus) {
|
|
case (.unprepared, .syncing):
|
|
return true
|
|
case (.error, .syncing),
|
|
(.disconnected, .syncing),
|
|
(.stopped, .syncing),
|
|
(.synced, .syncing):
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
}
|