259 lines
9.1 KiB
Swift
259 lines
9.1 KiB
Swift
//
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// Synchronizer.swift
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// ZcashLightClientKit
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//
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// Created by Francisco Gindre on 11/5/19.
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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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/**
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Represents errors thrown by a Synchronizer
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*/
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public enum SynchronizerError: Error {
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case initFailed(message: String)
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case syncFailed
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case connectionFailed(message: Error)
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case generalError(message: String)
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case maxRetryAttemptsReached(attempts: Int)
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case connectionError(status: Int, message: String)
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case networkTimeout
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case uncategorized(underlyingError: Error)
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case criticalError
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case parameterMissing(underlyingError: Error)
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case rewindError(underlyingError: Error)
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case rewindErrorUnknownArchorHeight
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}
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public enum ShieldFundsError: Error {
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case noUTXOFound
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case insuficientTransparentFunds
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case shieldingFailed(underlyingError: Error)
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}
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extension ShieldFundsError: LocalizedError {
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public var errorDescription: String? {
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switch self {
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case .noUTXOFound:
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return "Could not find UTXOs for the given t-address"
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case .insuficientTransparentFunds:
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return "You don't have enough confirmed transparent funds to perform a shielding transaction."
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case .shieldingFailed(let underlyingError):
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return "Shielding transaction failed. Reason: \(underlyingError)"
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}
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}
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}
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public protocol WalletBalance {
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var verified: Int64 { get set }
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var total: Int64 { get set }
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}
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/**
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Primary interface for interacting with the SDK. Defines the contract that specific
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implementations like SdkSynchronizer fulfill.
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*/
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public protocol Synchronizer {
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/**
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Value representing the Status of this Synchronizer. As the status changes, a new
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value will be emitted by KVO
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*/
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var status: Status { get }
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/**
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A flow of progress values, typically corresponding to this Synchronizer downloading blocks.
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Typically, any non-zero value below 1.0 indicates that progress indicators can be shown and
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a value of 1.0 signals that progress is complete and any progress indicators can be hidden. KVO Compliant
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*/
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var progress: Float { get }
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/**
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Initialize the internal state with the given Extended Viewing Keys and a wallet birthday
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- Parameter viewingKeys: an array containing the viewing keys to initialize the internal state
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- Parameter walletBirthday: the eldest when the different keys differ in birthday
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- Throws: Initializer Errors and RustWeldingError if fails
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- Note: The subsequent initializations don't have any effect or failure
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*/
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func initialize(unifiedViewingKeys: [UnifiedViewingKey], walletBirthday: BlockHeight) throws
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/**
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Starts this synchronizer within the given scope.
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Implementations should leverage structured concurrency and
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cancel all jobs when this scope completes.
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*/
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func start(retry: Bool) throws
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/**
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Stop this synchronizer. Implementations should ensure that calling this method cancels all
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jobs that were created by this instance.
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*/
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func stop() throws
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/**
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Gets the address for the given account.
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- Parameter accountIndex: the optional accountId whose address is of interest. By default, the first account is used.
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*/
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func getShieldedAddress(accountIndex: Int) -> String
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/**
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Sends zatoshi.
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- Parameter spendingKey: the key that allows spends to occur.
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- Parameter zatoshi: the amount of zatoshi to send.
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- Parameter toAddress: the recipient's address.
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- Parameter memo: the optional memo to include as part of the transaction.
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- Parameter accountIndex: the optional account id to use. By default, the first account is used.
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*/
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func sendToAddress(spendingKey: String, zatoshi: Int64, toAddress: String, memo: String?, from accountIndex: Int, resultBlock: @escaping (_ result: Result<PendingTransactionEntity, Error>) -> Void)
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/**
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Sends zatoshi.
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- Parameter spendingKey: the key that allows spends to occur.
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- Parameter transparentSecretKey: the key that allows to spend transaprent funds
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- Parameter memo: the optional memo to include as part of the transaction.
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- Parameter accountIndex: the optional account id that will be used to shield your funds to. By default, the first account is used.
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*/
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func shieldFunds(spendingKey: String, transparentSecretKey: String, memo: String?, from accountIndex: Int, resultBlock: @escaping (_ result: Result<PendingTransactionEntity, Error>) -> Void)
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/**
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Attempts to cancel a transaction that is about to be sent. Typically, cancellation is only
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an option if the transaction has not yet been submitted to the server.
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- Parameter transaction: the transaction to cancel.
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- Returns: true when the cancellation request was successful. False when it is too late.
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*/
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func cancelSpend(transaction: PendingTransactionEntity) -> Bool
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/**
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all outbound pending transactions that have been sent but are awaiting confirmations
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*/
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var pendingTransactions: [PendingTransactionEntity] { get }
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/**
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al the transactions that are on the blockchain
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*/
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var clearedTransactions: [ConfirmedTransactionEntity] { get }
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/**
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All transactions that are related to sending funds
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*/
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var sentTransactions: [ConfirmedTransactionEntity] { get }
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/**
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all transactions related to receiving funds
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*/
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var receivedTransactions: [ConfirmedTransactionEntity] { get }
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/**
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a repository serving transactions in a paginated manner
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- Parameter kind: Transaction Kind expected from this PaginatedTransactionRepository
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*/
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func paginatedTransactions(of kind: TransactionKind) -> PaginatedTransactionRepository
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/**
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Returns a list of confirmed transactions that preceed the given transaction with a limit count.
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- Parameters:
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- from: the confirmed transaction from which the query should start from or nil to retrieve from the most recent transaction
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- limit: the maximum amount of items this should return if available
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- Returns: an array with the given Transactions or nil
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*/
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func allConfirmedTransactions(from transaction: ConfirmedTransactionEntity?, limit: Int) throws -> [ConfirmedTransactionEntity]?
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/**
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gets the latest downloaded height from the compact block cache
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*/
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func latestDownloadedHeight() throws -> BlockHeight
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/**
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Gets the latest block height from the provided Lightwallet endpoint
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*/
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func latestHeight(result: @escaping (Result<BlockHeight, Error>) -> Void)
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/**
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Gets the latest block height from the provided Lightwallet endpoint
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Blocking
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*/
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func latestHeight() throws -> BlockHeight
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/**
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Gets the latests UTXOs for the given address from the specified height on
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*/
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func refreshUTXOs(address: String, from height: BlockHeight, result: @escaping (Result<RefreshedUTXOs,Error>) -> Void)
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/**
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gets the last stored unshielded balance
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*/
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func getTransparentBalance(address: String) throws -> WalletBalance
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/**
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gets the shielded total balance (includes verified and unverified balance)
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*/
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func getShieldedBalance(accountIndex: Int) -> Int64
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/**
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gets the shielded verified balance (anchor is 10 blocks back)
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*/
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func getShieldedVerifiedBalance(accountIndex: Int) -> Int64
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/**
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Stops the synchronizer and rescans the known blocks with the current keys.
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- Parameter policy: the rewind policy
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- Throws rewindErrorUnknownArchorHeight when the rewind points to an invalid height
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- Throws rewindError for other errors
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- Note rewind does not trigger notifications as a reorg would. You need to restart the synchronizer afterwards
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*/
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func rewind(_ policy: RewindPolicy) throws
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}
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/**
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The Status of the synchronizer
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*/
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public enum Status {
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/**
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Indicates that [stop] has been called on this Synchronizer and it will no longer be used.
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*/
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case stopped
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/**
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Indicates that this Synchronizer is disconnected from its lightwalletd server.
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When set, a UI element may want to turn red.
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*/
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case disconnected
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/**
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Indicates that this Synchronizer is not yet synced and therefore should not broadcast
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transactions because it does not have the latest data. When set, a UI element may want
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to turn yellow.
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*/
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case syncing
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/**
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Indicates that this Synchronizer is fully up to date and ready for all wallet functions.
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When set, a UI element may want to turn green.
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*/
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case synced
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}
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/**
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Kind of transactions handled by a Synchronizer
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*/
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public enum TransactionKind {
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case sent
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case received
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case all
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}
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/**
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Type of rewind available
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birthday: rewinds the local state to this wallet's birthday
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height: rewinds to an arbitrary blockheight
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transaction: rewinds to the mined height of the provided transaction.
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*/
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public enum RewindPolicy {
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case birthday
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case height(blockheight: BlockHeight)
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case transaction(_ transaction: TransactionEntity)
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}
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