706 lines
28 KiB
Swift
706 lines
28 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 UIKit
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public extension Notification.Name {
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/**
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Notification is posted whenever transactions are updated
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- Important: not yet posted
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*/
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static let transactionsUpdated = Notification.Name("SDKSyncronizerTransactionUpdated")
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/**
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Posted when the synchronizer is started.
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*/
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static let synchronizerStarted = Notification.Name("SDKSyncronizerStarted")
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/**
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Posted when there are progress updates.
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- Note: Query userInfo object for NotificationKeys.progress for Float progress percentage and NotificationKeys.blockHeight for the current progress height
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*/
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static let synchronizerProgressUpdated = Notification.Name("SDKSyncronizerProgressUpdated")
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/**
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Posted when the synchronizer is synced to latest height
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*/
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static let synchronizerSynced = Notification.Name("SDKSyncronizerSynced")
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/**
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Posted when the synchronizer is stopped
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*/
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static let synchronizerStopped = Notification.Name("SDKSyncronizerStopped")
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/**
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Posted when the synchronizer loses connection
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*/
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static let synchronizerDisconnected = Notification.Name("SDKSyncronizerDisconnected")
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/**
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Posted when the synchronizer starts syncing
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*/
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static let synchronizerSyncing = Notification.Name("SDKSyncronizerSyncing")
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/**
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Posted when the synchronizer finds a pendingTransaction that hast been newly mined
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- Note: query userInfo on NotificationKeys.minedTransaction for the transaction
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*/
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static let synchronizerMinedTransaction = Notification.Name("synchronizerMinedTransaction")
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/**
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Posted when the synchronizer finds a mined transaction
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- Note: query userInfo on NotificationKeys.foundTransactions for the [ConfirmedTransactionEntity]. This notification could arrive in a background thread.
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*/
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static let synchronizerFoundTransactions = Notification.Name("synchronizerFoundTransactions")
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/**
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Posted when the synchronizer presents an error
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- Note: query userInfo on NotificationKeys.error for an error
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*/
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static let synchronizerFailed = Notification.Name("SDKSynchronizerFailed")
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}
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/**
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Synchronizer implementation for UIKit and iOS 12+
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*/
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public class SDKSynchronizer: Synchronizer {
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public struct NotificationKeys {
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public static let progress = "SDKSynchronizer.progress"
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public static let blockHeight = "SDKSynchronizer.blockHeight"
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public static let blockDate = "SDKSynchronizer.blockDate"
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public static let minedTransaction = "SDKSynchronizer.minedTransaction"
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public static let foundTransactions = "SDKSynchronizer.foundTransactions"
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public static let error = "SDKSynchronizer.error"
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}
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public private(set) var status: Status {
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didSet {
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notify(status: status)
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}
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}
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public private(set) var progress: Float = 0.0
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public private(set) var blockProcessor: CompactBlockProcessor
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public private(set) var initializer: Initializer
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private var transactionManager: OutboundTransactionManager
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private var transactionRepository: TransactionRepository
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private var utxoRepository: UnspentTransactionOutputRepository
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/**
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Creates an SDKSynchronizer instance
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- Parameter initializer: a wallet Initializer object
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*/
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public convenience init(initializer: Initializer) throws {
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try self.init(status: .unprepared,
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initializer: initializer,
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transactionManager: try OutboundTransactionManagerBuilder.build(initializer: initializer),
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transactionRepository: initializer.transactionRepository,
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utxoRepository: try UTXORepositoryBuilder.build(initializer: initializer),
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blockProcessor: CompactBlockProcessor(initializer: initializer))
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}
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init(status: Status,
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initializer: Initializer,
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transactionManager: OutboundTransactionManager,
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transactionRepository: TransactionRepository,
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utxoRepository: UnspentTransactionOutputRepository,
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blockProcessor: CompactBlockProcessor) throws {
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self.status = status
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self.initializer = initializer
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self.transactionManager = transactionManager
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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.subscribeToProcessorNotifications(self.blockProcessor)
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}
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deinit {
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NotificationCenter.default.removeObserver(self)
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self.blockProcessor.stop()
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}
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public func initialize() throws {
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try self.initializer.initialize()
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try self.blockProcessor.setStartHeight(initializer.walletBirthday.height)
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}
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public func prepare() throws {
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try self.initializer.initialize()
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try self.blockProcessor.setStartHeight(initializer.walletBirthday.height)
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self.status = .disconnected
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}
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/**
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Starts the synchronizer
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- Throws: CompactBlockProcessorError when failures occur
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*/
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public func start(retry: Bool = false) throws {
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switch status {
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case .unprepared:
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throw SynchronizerError.notPrepared
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case .syncing:
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assert(true,"warning: synchronizer started when already started") // TODO: remove this assertion sometime in the near future
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LoggerProxy.debug("warning: synchronizer started when already started")
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return
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default:
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do {
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try blockProcessor.start(retry: retry)
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} catch {
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throw mapError(error)
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}
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}
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}
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/**
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Stops the synchronizer
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*/
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public func stop() {
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guard status != .stopped, status != .disconnected else {
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LoggerProxy.info("attempted to stop when status was: \(status)")
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return
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}
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blockProcessor.stop(cancelTasks: true)
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}
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private func subscribeToProcessorNotifications(_ processor: CompactBlockProcessor) {
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let center = NotificationCenter.default
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center.addObserver(self,
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selector: #selector(processorUpdated(_:)),
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name: Notification.Name.blockProcessorUpdated,
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object: processor)
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center.addObserver(self,
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selector: #selector(processorStartedDownloading(_:)),
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name: Notification.Name.blockProcessorStartedDownloading,
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object: processor)
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center.addObserver(self,
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selector: #selector(processorStartedValidating(_:)),
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name: Notification.Name.blockProcessorStartedValidating,
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object: processor)
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center.addObserver(self,
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selector: #selector(processorStartedScanning(_:)),
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name: Notification.Name.blockProcessorStartedScanning,
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object: processor)
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center.addObserver(self,
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selector: #selector(processorStopped(_:)),
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name: Notification.Name.blockProcessorStopped,
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object: processor)
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center.addObserver(self, selector: #selector(processorFailed(_:)),
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name: Notification.Name.blockProcessorFailed,
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object: processor)
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center.addObserver(self,
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selector: #selector(processorIdle(_:)),
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name: Notification.Name.blockProcessorIdle,
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object: processor)
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center.addObserver(self,
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selector: #selector(processorFinished(_:)),
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name: Notification.Name.blockProcessorFinished,
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object: processor)
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center.addObserver(self,
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selector: #selector(processorTransitionUnknown(_:)),
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name: Notification.Name.blockProcessorUnknownTransition,
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object: processor)
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center.addObserver(self,
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selector: #selector(reorgDetected(_:)),
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name: Notification.Name.blockProcessorHandledReOrg,
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object: processor)
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center.addObserver(self,
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selector: #selector(transactionsFound(_:)),
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name: Notification.Name.blockProcessorFoundTransactions,
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object: processor)
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}
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// MARK: Block Processor notifications
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@objc func transactionsFound(_ notification: Notification) {
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guard let userInfo = notification.userInfo,
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let foundTransactions = userInfo[CompactBlockProcessorNotificationKey.foundTransactions] as? [ConfirmedTransactionEntity] else {
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return
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}
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NotificationCenter.default.post(name: .synchronizerFoundTransactions, object: self, userInfo: [ NotificationKeys.foundTransactions : foundTransactions])
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}
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@objc func reorgDetected(_ notification: Notification) {
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guard let userInfo = notification.userInfo,
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let progress = userInfo[CompactBlockProcessorNotificationKey.reorgHeight] as? BlockHeight,
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let rewindHeight = userInfo[CompactBlockProcessorNotificationKey.rewindHeight] as? BlockHeight else {
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LoggerProxy.debug("error processing reorg notification")
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return }
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LoggerProxy.debug("handling reorg at: \(progress) with rewind height: \(rewindHeight)")
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do {
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try transactionManager.handleReorg(at: rewindHeight)
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} catch {
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LoggerProxy.debug("error handling reorg: \(error)")
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notifyFailure(error)
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}
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}
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@objc func processorUpdated(_ notification: Notification) {
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guard let userInfo = notification.userInfo,
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let progress = userInfo[CompactBlockProcessorNotificationKey.progress] as? Float,
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let height = userInfo[CompactBlockProcessorNotificationKey.progressHeight] as? BlockHeight else {
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return
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}
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var blockDate: Date? = nil
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if let time = userInfo[CompactBlockProcessorNotificationKey.progressBlockTime] as? TimeInterval {
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blockDate = Date(timeIntervalSince1970: time)
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}
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self.progress = progress
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self.notify(progress: progress,
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height: height,
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time: blockDate)
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}
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@objc func processorStartedDownloading(_ notification: Notification) {
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DispatchQueue.main.async { [weak self] in
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guard let self = self else { return }
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self.status = .syncing
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}
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}
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@objc func processorStartedValidating(_ notification: Notification) {
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DispatchQueue.main.async { [weak self] in
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guard let self = self else { return }
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self.status = .syncing
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}
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}
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@objc func processorStartedScanning(_ notification: Notification) {
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DispatchQueue.main.async { [weak self] in
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guard let self = self else { return }
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self.status = .syncing
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}
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}
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@objc func processorStopped(_ notification: Notification) {
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DispatchQueue.main.async { [weak self] in
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guard let self = self else { return }
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self.status = .stopped
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}
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}
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@objc func processorFailed(_ notification: Notification) {
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DispatchQueue.main.async { [weak self] in
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guard let self = self else { return }
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if let error = notification.userInfo?[CompactBlockProcessorNotificationKey.error] as? Error {
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self.notifyFailure(error)
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} else {
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self.notifyFailure(CompactBlockProcessorError.generalError(message: "This is strange. processorFailed Call received no error message"))
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}
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self.status = .disconnected
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}
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}
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@objc func processorIdle(_ notification: Notification) {
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DispatchQueue.main.async { [weak self] in
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guard let self = self else { return }
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self.status = .disconnected
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}
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}
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@objc func processorFinished(_ notification: Notification) {
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// FIX: Pending transaction updates fail if done from another thread. Improvement needed: explicitly define queues for sql repositories
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DispatchQueue.main.async { [weak self] in
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guard let self = self else { return }
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self.refreshPendingTransactions()
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self.status = .synced
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}
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}
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@objc func processorTransitionUnknown(_ notification: Notification) {
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self.status = .disconnected
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}
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// MARK: Synchronizer methods
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public func sendToAddress(spendingKey: String, zatoshi: Int64, toAddress: String, memo: String?, from accountIndex: Int, resultBlock: @escaping (Result<PendingTransactionEntity, Error>) -> Void) {
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initializer.downloadParametersIfNeeded { (downloadResult) in
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DispatchQueue.main.async { [weak self] in
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switch downloadResult {
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case .success:
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self?.createToAddress(spendingKey: spendingKey, zatoshi: zatoshi, toAddress: toAddress, memo: memo, from: accountIndex, resultBlock: resultBlock)
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case .failure(let error):
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resultBlock(.failure(SynchronizerError.parameterMissing(underlyingError: error)))
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}
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}
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}
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}
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public func shieldFunds(spendingKey: String, transparentSecretKey: String, memo: String?, from accountIndex: Int, resultBlock: @escaping (Result<PendingTransactionEntity, Error>) -> Void) {
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// let's see if there are funds to shield
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let derivationTool = DerivationTool.default
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do {
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let tAddr = try derivationTool.deriveTransparentAddressFromPrivateKey(transparentSecretKey)
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let tBalance = try utxoRepository.balance(address: tAddr, latestHeight: self.latestDownloadedHeight())
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guard tBalance.verified >= ZcashSDK.shieldingThreshold else {
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resultBlock(.failure(ShieldFundsError.insuficientTransparentFunds))
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return
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}
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let vk = try derivationTool.deriveViewingKey(spendingKey: spendingKey)
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let zAddr = try derivationTool.deriveShieldedAddress(viewingKey: vk)
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let shieldingSpend = try transactionManager.initSpend(zatoshi: Int(tBalance.verified), toAddress: zAddr, memo: memo, from: 0)
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transactionManager.encodeShieldingTransaction(spendingKey: spendingKey, tsk: transparentSecretKey, pendingTransaction: shieldingSpend) {[weak self] (result) in
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guard let self = self else { return }
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switch result {
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case .success(let tx):
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self.transactionManager.submit(pendingTransaction: tx) { (submitResult) in
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switch submitResult {
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case .success(let submittedTx):
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resultBlock(.success(submittedTx))
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case .failure(let submissionError):
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DispatchQueue.main.async {
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resultBlock(.failure(submissionError))
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}
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}
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}
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case .failure(let error):
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resultBlock(.failure(error))
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}
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}
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} catch {
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resultBlock(.failure(error))
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return
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}
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}
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func createToAddress(spendingKey: String, zatoshi: Int64, toAddress: String, memo: String?, from accountIndex: Int, resultBlock: @escaping (Result<PendingTransactionEntity, Error>) -> Void) {
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do {
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let spend = try transactionManager.initSpend(zatoshi: Int(zatoshi), toAddress: toAddress, memo: memo, from: accountIndex)
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transactionManager.encode(spendingKey: spendingKey, pendingTransaction: spend) { [weak self] (result) in
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guard let self = self else { return }
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switch result {
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case .success(let tx):
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self.transactionManager.submit(pendingTransaction: tx) { (submitResult) in
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switch submitResult {
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case .success(let submittedTx):
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resultBlock(.success(submittedTx))
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case .failure(let submissionError):
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DispatchQueue.main.async {
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resultBlock(.failure(submissionError))
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}
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}
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}
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case .failure(let error):
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resultBlock(.failure(error))
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}
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}
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} catch {
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resultBlock(.failure(error))
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}
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}
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public func cancelSpend(transaction: PendingTransactionEntity) -> Bool {
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transactionManager.cancel(pendingTransaction: transaction)
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}
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public func allReceivedTransactions() throws -> [ConfirmedTransactionEntity] {
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try transactionRepository.findAllReceivedTransactions(offset: 0, limit: Int.max) ?? [ConfirmedTransactionEntity]()
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}
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public func allPendingTransactions() throws -> [PendingTransactionEntity] {
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try transactionManager.allPendingTransactions() ?? [PendingTransactionEntity]()
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}
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public func allClearedTransactions() throws -> [ConfirmedTransactionEntity] {
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try transactionRepository.findAll(offset: 0, limit: Int.max) ?? [ConfirmedTransactionEntity]()
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}
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public func allSentTransactions() throws -> [ConfirmedTransactionEntity] {
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try transactionRepository.findAllSentTransactions(offset: 0, limit: Int.max) ?? [ConfirmedTransactionEntity]()
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}
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public func allConfirmedTransactions(from transaction: ConfirmedTransactionEntity?, limit: Int) throws -> [ConfirmedTransactionEntity]? {
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try transactionRepository.findAll(from: transaction, limit: limit)
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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 latestDownloadedHeight() throws -> BlockHeight {
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try initializer.downloader.lastDownloadedBlockHeight()
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}
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public func latestHeight(result: @escaping (Result<BlockHeight, Error>) -> Void) {
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initializer.downloader.latestBlockHeight(result: result)
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}
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public func latestHeight() throws -> BlockHeight {
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try initializer.downloader.latestBlockHeight()
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}
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public func latestUTXOs(address: String, result: @escaping (Result<[UnspentTransactionOutputEntity], Error>) -> Void) {
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guard initializer.isValidTransparentAddress(address) else {
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result(.failure(SynchronizerError.generalError(message: "invalid t-address")))
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return
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}
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initializer.lightWalletService.fetchUTXOs(for: address, height: ZcashSDK.SAPLING_ACTIVATION_HEIGHT, result: { [weak self] r in
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guard let self = self else { return }
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switch r {
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case .success(let utxos):
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do {
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try self.utxoRepository.clearAll(address: address)
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try self.utxoRepository.store(utxos: utxos)
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result(.success(utxos))
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} catch {
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result(.failure(SynchronizerError.generalError(message: "\(error)")))
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}
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case .failure(let error):
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result(.failure(SynchronizerError.connectionFailed(message: error)))
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}
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})
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}
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public func refreshUTXOs(address: String, from height: BlockHeight = ZcashSDK.SAPLING_ACTIVATION_HEIGHT, result: @escaping (Result<RefreshedUTXOs, Error>) -> Void) {
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self.blockProcessor.refreshUTXOs(tAddress: address, startHeight: height, result: result)
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}
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public func getShieldedBalance(accountIndex: Int = 0) -> Int64 {
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initializer.getBalance(account: accountIndex)
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}
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public func getShieldedVerifiedBalance(accountIndex: Int = 0) -> Int64 {
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initializer.getVerifiedBalance(account: accountIndex)
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}
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public func getShieldedAddress(accountIndex: Int) -> SaplingShieldedAddress? {
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blockProcessor.getShieldedAddress(accountIndex: accountIndex)
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}
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public func getUnifiedAddress(accountIndex: Int) -> UnifiedAddress? {
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blockProcessor.getUnifiedAddres(accountIndex: accountIndex)
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}
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public func getTransparentAddress(accountIndex: Int) -> TransparentAddress? {
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blockProcessor.getTransparentAddress(accountIndex: accountIndex)
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}
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public func getTransparentBalance(accountIndex: Int) throws -> WalletBalance {
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try blockProcessor.getTransparentBalance(accountIndex: accountIndex)
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}
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/**
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gets the last stored unshielded balance
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*/
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public func getTransparentBalance(address: String) throws -> WalletBalance {
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do {
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return try self.blockProcessor.utxoCacheBalance(tAddress: address)
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} catch {
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throw SynchronizerError.uncategorized(underlyingError: error)
|
|
}
|
|
}
|
|
|
|
public func rewind(_ policy: RewindPolicy) throws {
|
|
self.stop()
|
|
|
|
var height: BlockHeight?
|
|
|
|
|
|
switch policy {
|
|
case .quick:
|
|
break
|
|
case .birthday:
|
|
let birthday = self.blockProcessor.config.walletBirthday
|
|
height = birthday
|
|
|
|
case .height(let rewindHeight):
|
|
height = rewindHeight
|
|
|
|
case .transaction(let tx):
|
|
guard let txHeight = tx.anchor else {
|
|
throw SynchronizerError.rewindErrorUnknownArchorHeight
|
|
}
|
|
height = txHeight
|
|
}
|
|
|
|
do {
|
|
let rewindHeight = try self.blockProcessor.rewindTo(height)
|
|
try self.transactionManager.handleReorg(at: rewindHeight)
|
|
} catch {
|
|
throw SynchronizerError.rewindError(underlyingError: error)
|
|
}
|
|
}
|
|
|
|
// MARK: notify state
|
|
private func notify(progress: Float, height: BlockHeight, time: Date?) {
|
|
|
|
var userInfo = [AnyHashable : Any]()
|
|
userInfo[NotificationKeys.progress] = progress
|
|
userInfo[NotificationKeys.blockHeight] = height
|
|
if let blockDate = time {
|
|
userInfo[NotificationKeys.blockDate] = blockDate
|
|
}
|
|
NotificationCenter.default.post(name: Notification.Name.synchronizerProgressUpdated, object: self, userInfo: userInfo)
|
|
}
|
|
|
|
private func notify(status: Status) {
|
|
|
|
switch status {
|
|
case .disconnected:
|
|
NotificationCenter.default.post(name: Notification.Name.synchronizerDisconnected, object: self)
|
|
case .stopped:
|
|
NotificationCenter.default.post(name: Notification.Name.synchronizerStopped, object: self)
|
|
case .synced:
|
|
NotificationCenter.default.post(name: Notification.Name.synchronizerSynced, object: self)
|
|
case .syncing:
|
|
NotificationCenter.default.post(name: Notification.Name.synchronizerSyncing, object: self)
|
|
case .unprepared:
|
|
break
|
|
}
|
|
}
|
|
// MARK: book keeping
|
|
|
|
private func updateMinedTransactions() throws {
|
|
try transactionManager.allPendingTransactions()?.filter( { $0.isSubmitSuccess && !$0.isMined } ).forEach( { pendingTx in
|
|
guard let rawId = pendingTx.rawTransactionId else { return }
|
|
let tx = try transactionRepository.findBy(rawId: rawId)
|
|
|
|
guard let minedHeight = tx?.minedHeight else { return }
|
|
|
|
let minedTx = try transactionManager.applyMinedHeight(pendingTransaction: pendingTx, minedHeight: minedHeight)
|
|
|
|
notifyMinedTransaction(minedTx)
|
|
|
|
})
|
|
}
|
|
|
|
private func removeConfirmedTransactions() throws {
|
|
let latestHeight = try transactionRepository.lastScannedHeight()
|
|
|
|
try transactionManager.allPendingTransactions()?.filter( {
|
|
$0.minedHeight > 0 && abs($0.minedHeight - latestHeight) >= ZcashSDK.DEFAULT_STALE_TOLERANCE }
|
|
).forEach( {
|
|
try transactionManager.delete(pendingTransaction: $0)
|
|
} )
|
|
}
|
|
|
|
private func refreshPendingTransactions() {
|
|
do {
|
|
try updateMinedTransactions()
|
|
try removeConfirmedTransactions()
|
|
} catch {
|
|
LoggerProxy.debug("error refreshing pending transactions: \(error)")
|
|
}
|
|
}
|
|
|
|
private func notifyMinedTransaction(_ tx: PendingTransactionEntity) {
|
|
DispatchQueue.main.async {
|
|
[weak self] in
|
|
guard let self = self else { return }
|
|
|
|
NotificationCenter.default.post(name: Notification.Name.synchronizerMinedTransaction, object: self, userInfo: [NotificationKeys.minedTransaction : tx])
|
|
}
|
|
}
|
|
|
|
private func mapError(_ error: Error) -> Error {
|
|
if let compactBlockProcessorError = error as? CompactBlockProcessorError {
|
|
switch compactBlockProcessorError {
|
|
case .dataDbInitFailed(let path):
|
|
return SynchronizerError.initFailed(message: "DataDb init failed at path: \(path)")
|
|
case .connectionError(let message):
|
|
return SynchronizerError.connectionFailed(message: message)
|
|
case .invalidConfiguration:
|
|
return SynchronizerError.generalError(message: "Invalid Configuration")
|
|
case .missingDbPath(let path):
|
|
return SynchronizerError.initFailed(message: "missing Db path: \(path)")
|
|
case .generalError(let message):
|
|
return SynchronizerError.generalError(message: message)
|
|
case .maxAttemptsReached(attempts: let attempts):
|
|
return SynchronizerError.maxRetryAttemptsReached(attempts: attempts)
|
|
case .grpcError(let statusCode, let message):
|
|
return SynchronizerError.connectionError(status: statusCode, message: message)
|
|
case .connectionTimeout:
|
|
return SynchronizerError.networkTimeout
|
|
case .unspecifiedError(let underlyingError):
|
|
return SynchronizerError.uncategorized(underlyingError: underlyingError)
|
|
case .criticalError:
|
|
return SynchronizerError.criticalError
|
|
case .invalidAccount:
|
|
return SynchronizerError.invalidAccount
|
|
case .wrongConsensusBranchId:
|
|
return SynchronizerError.lightwalletdValidationFailed(underlyingError: compactBlockProcessorError)
|
|
case .networkMismatch:
|
|
return SynchronizerError.lightwalletdValidationFailed(underlyingError: compactBlockProcessorError)
|
|
case .saplingActivationMismatch:
|
|
return SynchronizerError.lightwalletdValidationFailed(underlyingError: compactBlockProcessorError)
|
|
}
|
|
}
|
|
return SynchronizerError.uncategorized(underlyingError: error)
|
|
}
|
|
|
|
private func notifyFailure(_ error: Error) {
|
|
|
|
DispatchQueue.main.async {
|
|
[weak self] in
|
|
guard let self = self else { return }
|
|
|
|
NotificationCenter.default.post(name: Notification.Name.synchronizerFailed, object: self, userInfo: [NotificationKeys.error : self.mapError(error)])
|
|
}
|
|
}
|
|
}
|
|
|
|
extension SDKSynchronizer {
|
|
|
|
public var pendingTransactions: [PendingTransactionEntity] {
|
|
(try? self.allPendingTransactions()) ?? [PendingTransactionEntity]()
|
|
}
|
|
|
|
public var clearedTransactions: [ConfirmedTransactionEntity] {
|
|
(try? self.allClearedTransactions()) ?? [ConfirmedTransactionEntity]()
|
|
}
|
|
|
|
public var sentTransactions: [ConfirmedTransactionEntity] {
|
|
(try? self.allSentTransactions()) ?? [ConfirmedTransactionEntity]()
|
|
}
|
|
|
|
public var receivedTransactions: [ConfirmedTransactionEntity] {
|
|
(try? self.allReceivedTransactions()) ?? [ConfirmedTransactionEntity]()
|
|
}
|
|
}
|