673 lines
23 KiB
Swift
673 lines
23 KiB
Swift
//
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// ZcashRustBackend.swift
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// ZcashLightClientKit
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//
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// Created by Jack Grigg on 5/8/19.
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// Copyright © 2019 Electric Coin Company. All rights reserved.
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//
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// swiftlint:disable type_body_length
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import Foundation
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import libzcashlc
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actor ZcashRustBackend: ZcashRustBackendWelding {
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let minimumConfirmations: UInt32 = 10
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let useZIP317Fees = false
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let dbData: (String, UInt)
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let fsBlockDbRoot: (String, UInt)
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let spendParamsPath: (String, UInt)
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let outputParamsPath: (String, UInt)
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let keyDeriving: ZcashKeyDerivationBackendWelding
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nonisolated let networkType: NetworkType
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/// Creates instance of `ZcashRustBackend`.
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/// - Parameters:
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/// - dbData: `URL` pointing to file where data database will be.
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/// - fsBlockDbRoot: `URL` pointing to the filesystem root directory where the fsBlock cache is.
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/// this directory is expected to contain a `/blocks` sub-directory with the blocks stored in the convened filename
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/// format `{height}-{hash}-block`. This directory has must be granted both write and read permissions.
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/// - spendParamsPath: `URL` pointing to spend parameters file.
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/// - outputParamsPath: `URL` pointing to output parameters file.
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/// - networkType: Network type to use.
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init(dbData: URL, fsBlockDbRoot: URL, spendParamsPath: URL, outputParamsPath: URL, networkType: NetworkType) {
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self.dbData = dbData.osStr()
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self.fsBlockDbRoot = fsBlockDbRoot.osPathStr()
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self.spendParamsPath = spendParamsPath.osPathStr()
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self.outputParamsPath = outputParamsPath.osPathStr()
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self.networkType = networkType
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self.keyDeriving = ZcashKeyDerivationBackend(networkType: networkType)
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}
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func createAccount(seed: [UInt8]) async throws -> UnifiedSpendingKey {
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guard let ffiBinaryKeyPtr = zcashlc_create_account(
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dbData.0,
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dbData.1,
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seed,
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UInt(seed.count),
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networkType.networkId
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) else {
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throw lastError() ?? .genericError(message: "No error message available")
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}
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defer { zcashlc_free_binary_key(ffiBinaryKeyPtr) }
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return ffiBinaryKeyPtr.pointee.unsafeToUnifiedSpendingKey(network: networkType)
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}
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func createToAddress(
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usk: UnifiedSpendingKey,
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to address: String,
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value: Int64,
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memo: MemoBytes?
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) async throws -> Int64 {
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let result = usk.bytes.withUnsafeBufferPointer { uskPtr in
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zcashlc_create_to_address(
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dbData.0,
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dbData.1,
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uskPtr.baseAddress,
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UInt(usk.bytes.count),
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[CChar](address.utf8CString),
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value,
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memo?.bytes,
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spendParamsPath.0,
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spendParamsPath.1,
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outputParamsPath.0,
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outputParamsPath.1,
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networkType.networkId,
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minimumConfirmations,
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useZIP317Fees
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)
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}
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guard result > 0 else {
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throw lastError() ?? .genericError(message: "No error message available")
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}
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return result
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}
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func decryptAndStoreTransaction(txBytes: [UInt8], minedHeight: Int32) async throws {
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let result = zcashlc_decrypt_and_store_transaction(
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dbData.0,
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dbData.1,
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txBytes,
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UInt(txBytes.count),
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UInt32(minedHeight),
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networkType.networkId
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)
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guard result != 0 else {
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throw lastError() ?? .genericError(message: "No error message available")
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}
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}
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func getBalance(account: Int32) async throws -> Int64 {
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let balance = zcashlc_get_balance(dbData.0, dbData.1, account, networkType.networkId)
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guard balance >= 0 else {
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throw throwBalanceError(account: account, lastError(), fallbackMessage: "Error getting total balance from account \(account)")
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}
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return balance
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}
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func getCurrentAddress(account: Int32) async throws -> UnifiedAddress {
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guard let addressCStr = zcashlc_get_current_address(
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dbData.0,
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dbData.1,
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account,
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networkType.networkId
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) else {
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throw lastError() ?? .genericError(message: "No error message available")
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}
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defer { zcashlc_string_free(addressCStr) }
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guard let address = String(validatingUTF8: addressCStr) else {
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throw RustWeldingError.unableToDeriveKeys
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}
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return UnifiedAddress(validatedEncoding: address, networkType: networkType)
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}
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func getNearestRewindHeight(height: Int32) async throws -> Int32 {
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let result = zcashlc_get_nearest_rewind_height(
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dbData.0,
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dbData.1,
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height,
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networkType.networkId
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)
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guard result > 0 else {
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throw lastError() ?? .genericError(message: "No error message available")
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}
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return result
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}
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func getNextAvailableAddress(account: Int32) async throws -> UnifiedAddress {
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guard let addressCStr = zcashlc_get_next_available_address(
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dbData.0,
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dbData.1,
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account,
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networkType.networkId
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) else {
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throw lastError() ?? .genericError(message: "No error message available")
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}
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defer { zcashlc_string_free(addressCStr) }
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guard let address = String(validatingUTF8: addressCStr) else {
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throw RustWeldingError.unableToDeriveKeys
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}
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return UnifiedAddress(validatedEncoding: address, networkType: networkType)
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}
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func getReceivedMemo(idNote: Int64) async -> Memo? {
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var contiguousMemoBytes = ContiguousArray<UInt8>(MemoBytes.empty().bytes)
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var success = false
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contiguousMemoBytes.withUnsafeMutableBufferPointer { memoBytePtr in
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success = zcashlc_get_received_memo(dbData.0, dbData.1, idNote, memoBytePtr.baseAddress, networkType.networkId)
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}
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guard success else { return nil }
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return (try? MemoBytes(contiguousBytes: contiguousMemoBytes)).flatMap { try? $0.intoMemo() }
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}
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func getSentMemo(idNote: Int64) async -> Memo? {
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var contiguousMemoBytes = ContiguousArray<UInt8>(MemoBytes.empty().bytes)
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var success = false
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contiguousMemoBytes.withUnsafeMutableBytes { memoBytePtr in
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success = zcashlc_get_sent_memo(dbData.0, dbData.1, idNote, memoBytePtr.baseAddress, networkType.networkId)
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}
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guard success else { return nil }
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return (try? MemoBytes(contiguousBytes: contiguousMemoBytes)).flatMap { try? $0.intoMemo() }
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}
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func getTransparentBalance(account: Int32) async throws -> Int64 {
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guard account >= 0 else {
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throw RustWeldingError.invalidInput(message: "Account index must be non-negative")
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}
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let balance = zcashlc_get_total_transparent_balance_for_account(
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dbData.0,
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dbData.1,
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networkType.networkId,
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account
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)
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guard balance >= 0 else {
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throw throwBalanceError(account: account, lastError(), fallbackMessage: "Error getting Total Transparent balance from account \(account)")
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}
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return balance
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}
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func getVerifiedBalance(account: Int32) async throws -> Int64 {
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let balance = zcashlc_get_verified_balance(
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dbData.0,
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dbData.1,
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account,
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networkType.networkId,
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minimumConfirmations
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)
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guard balance >= 0 else {
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throw throwBalanceError(account: account, lastError(), fallbackMessage: "Error getting verified balance from account \(account)")
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}
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return balance
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}
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func getVerifiedTransparentBalance(account: Int32) async throws -> Int64 {
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guard account >= 0 else {
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throw RustWeldingError.invalidInput(message: "`account` must be non-negative")
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}
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let balance = zcashlc_get_verified_transparent_balance_for_account(
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dbData.0,
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dbData.1,
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networkType.networkId,
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account,
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minimumConfirmations
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)
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guard balance >= 0 else {
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throw throwBalanceError(
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account: account,
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lastError(),
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fallbackMessage: "Error getting verified transparent balance from account \(account)"
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)
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}
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return balance
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}
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private nonisolated func lastError() -> RustWeldingError? {
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defer { zcashlc_clear_last_error() }
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guard let message = getLastError() else {
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return nil
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}
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if message.contains("couldn't load Sapling spend parameters") {
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return RustWeldingError.saplingSpendParametersNotFound
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} else if message.contains("is not empty") {
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return RustWeldingError.dataDbNotEmpty
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}
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return RustWeldingError.genericError(message: message)
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}
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private nonisolated func getLastError() -> String? {
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let errorLen = zcashlc_last_error_length()
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if errorLen > 0 {
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let error = UnsafeMutablePointer<Int8>.allocate(capacity: Int(errorLen))
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zcashlc_error_message_utf8(error, errorLen)
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zcashlc_clear_last_error()
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return String(validatingUTF8: error)
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} else {
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return nil
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}
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}
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func initDataDb(seed: [UInt8]?) async throws -> DbInitResult {
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switch zcashlc_init_data_database(dbData.0, dbData.1, seed, UInt(seed?.count ?? 0), networkType.networkId) {
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case 0: // ok
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return DbInitResult.success
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case 1:
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return DbInitResult.seedRequired
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default:
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throw throwDataDbError(lastError() ?? .genericError(message: "No error message found"))
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}
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}
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func initAccountsTable(ufvks: [UnifiedFullViewingKey]) async throws {
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var ffiUfvks: [FFIEncodedKey] = []
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for ufvk in ufvks {
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guard !ufvk.encoding.containsCStringNullBytesBeforeStringEnding() else {
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throw RustWeldingError.invalidInput(message: "`UFVK` contains null bytes.")
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}
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guard self.keyDeriving.isValidUnifiedFullViewingKey(ufvk.encoding) else {
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throw RustWeldingError.invalidInput(message: "UFVK is invalid.")
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}
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let ufvkCStr = [CChar](String(ufvk.encoding).utf8CString)
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let ufvkPtr = UnsafeMutablePointer<CChar>.allocate(capacity: ufvkCStr.count)
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ufvkPtr.initialize(from: ufvkCStr, count: ufvkCStr.count)
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ffiUfvks.append(
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FFIEncodedKey(account_id: ufvk.account, encoding: ufvkPtr)
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)
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}
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var contiguousUVKs = ContiguousArray(ffiUfvks)
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var result = false
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contiguousUVKs.withContiguousMutableStorageIfAvailable { ufvksPtr in
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result = zcashlc_init_accounts_table_with_keys(
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dbData.0,
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dbData.1,
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ufvksPtr.baseAddress,
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UInt(ufvks.count),
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networkType.networkId
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)
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}
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defer {
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for ufvk in ffiUfvks {
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ufvk.encoding.deallocate()
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}
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}
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guard result else {
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throw lastError() ?? .genericError(message: "`initAccountsTable` failed with unknown error")
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}
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}
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func initBlockMetadataDb() async throws {
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let result = zcashlc_init_block_metadata_db(fsBlockDbRoot.0, fsBlockDbRoot.1)
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guard result else {
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throw lastError() ?? .genericError(message: "`initAccountsTable` failed with unknown error")
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}
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}
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func writeBlocksMetadata(blocks: [ZcashCompactBlock]) async throws {
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var ffiBlockMetaVec: [FFIBlockMeta] = []
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for block in blocks {
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let meta = block.meta
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let hashPtr = UnsafeMutablePointer<UInt8>.allocate(capacity: meta.hash.count)
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let contiguousHashBytes = ContiguousArray(meta.hash.bytes)
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let result: Void? = contiguousHashBytes.withContiguousStorageIfAvailable { hashBytesPtr in
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// swiftlint:disable:next force_unwrapping
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hashPtr.initialize(from: hashBytesPtr.baseAddress!, count: hashBytesPtr.count)
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}
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guard result != nil else {
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defer {
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hashPtr.deallocate()
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ffiBlockMetaVec.deallocateElements()
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}
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throw RustWeldingError.writeBlocksMetadataAllocationProblem
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}
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ffiBlockMetaVec.append(
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FFIBlockMeta(
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height: UInt32(block.height),
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block_hash_ptr: hashPtr,
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block_hash_ptr_len: UInt(contiguousHashBytes.count),
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block_time: meta.time,
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sapling_outputs_count: meta.saplingOutputs,
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orchard_actions_count: meta.orchardOutputs
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)
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)
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}
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var contiguousFFIBlocks = ContiguousArray(ffiBlockMetaVec)
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let len = UInt(contiguousFFIBlocks.count)
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let fsBlocks = UnsafeMutablePointer<FFIBlocksMeta>.allocate(capacity: 1)
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defer { ffiBlockMetaVec.deallocateElements() }
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try contiguousFFIBlocks.withContiguousMutableStorageIfAvailable { ptr in
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var meta = FFIBlocksMeta()
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meta.ptr = ptr.baseAddress
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meta.len = len
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fsBlocks.initialize(to: meta)
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let res = zcashlc_write_block_metadata(fsBlockDbRoot.0, fsBlockDbRoot.1, fsBlocks)
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guard res else {
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throw lastError() ?? RustWeldingError.genericError(message: "failed to write block metadata")
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}
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}
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}
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func initBlocksTable(
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height: Int32,
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hash: String,
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time: UInt32,
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saplingTree: String
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) async throws {
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guard !hash.containsCStringNullBytesBeforeStringEnding() else {
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throw RustWeldingError.invalidInput(message: "`hash` contains null bytes.")
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}
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guard !saplingTree.containsCStringNullBytesBeforeStringEnding() else {
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throw RustWeldingError.invalidInput(message: "`saplingTree` contains null bytes.")
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}
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guard zcashlc_init_blocks_table(
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dbData.0,
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dbData.1,
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height,
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[CChar](hash.utf8CString),
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time,
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[CChar](saplingTree.utf8CString),
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networkType.networkId
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) != 0 else {
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throw lastError() ?? .genericError(message: "No error message available")
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}
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}
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func latestCachedBlockHeight() async -> BlockHeight {
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return BlockHeight(zcashlc_latest_cached_block_height(fsBlockDbRoot.0, fsBlockDbRoot.1))
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}
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func listTransparentReceivers(account: Int32) async throws -> [TransparentAddress] {
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guard let encodedKeysPtr = zcashlc_list_transparent_receivers(
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dbData.0,
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dbData.1,
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account,
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networkType.networkId
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) else {
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throw lastError() ?? .genericError(message: "No error message available")
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}
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defer { zcashlc_free_keys(encodedKeysPtr) }
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var addresses: [TransparentAddress] = []
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for i in (0 ..< Int(encodedKeysPtr.pointee.len)) {
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let key = encodedKeysPtr.pointee.ptr.advanced(by: i).pointee
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guard let taddrStr = String(validatingUTF8: key.encoding) else {
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throw RustWeldingError.unableToDeriveKeys
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}
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addresses.append(
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TransparentAddress(validatedEncoding: taddrStr)
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)
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}
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return addresses
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}
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func putUnspentTransparentOutput(
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txid: [UInt8],
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index: Int,
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script: [UInt8],
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value: Int64,
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height: BlockHeight
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) async throws {
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guard zcashlc_put_utxo(
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dbData.0,
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dbData.1,
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txid,
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UInt(txid.count),
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Int32(index),
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script,
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UInt(script.count),
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value,
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Int32(height),
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networkType.networkId
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) else {
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throw lastError() ?? .genericError(message: "No error message available")
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}
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}
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func validateCombinedChain(limit: UInt32 = 0) async throws {
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let result = zcashlc_validate_combined_chain(fsBlockDbRoot.0, fsBlockDbRoot.1, dbData.0, dbData.1, networkType.networkId, limit)
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switch result {
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case -1:
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return
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case 0:
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throw RustWeldingError.chainValidationFailed(message: getLastError())
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default:
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throw RustWeldingError.invalidChain(upperBound: result)
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}
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}
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func rewindToHeight(height: Int32) async throws {
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let result = zcashlc_rewind_to_height(dbData.0, dbData.1, height, networkType.networkId)
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guard result else {
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throw lastError() ?? .genericError(message: "No error message available")
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}
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}
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func rewindCacheToHeight(height: Int32) async throws {
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let result = zcashlc_rewind_fs_block_cache_to_height(fsBlockDbRoot.0, fsBlockDbRoot.1, height)
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guard result else {
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throw lastError() ?? .genericError(message: "No error message available")
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}
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}
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func scanBlocks(limit: UInt32 = 0) async throws {
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let result = zcashlc_scan_blocks(fsBlockDbRoot.0, fsBlockDbRoot.1, dbData.0, dbData.1, limit, networkType.networkId)
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guard result != 0 else {
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throw lastError() ?? .genericError(message: "No error message available")
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}
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}
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func shieldFunds(
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usk: UnifiedSpendingKey,
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memo: MemoBytes?,
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shieldingThreshold: Zatoshi
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) async throws -> Int64 {
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let result = usk.bytes.withUnsafeBufferPointer { uskBuffer in
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zcashlc_shield_funds(
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dbData.0,
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dbData.1,
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uskBuffer.baseAddress,
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UInt(usk.bytes.count),
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memo?.bytes,
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UInt64(shieldingThreshold.amount),
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spendParamsPath.0,
|
|
spendParamsPath.1,
|
|
outputParamsPath.0,
|
|
outputParamsPath.1,
|
|
networkType.networkId,
|
|
minimumConfirmations,
|
|
useZIP317Fees
|
|
)
|
|
}
|
|
|
|
guard result > 0 else {
|
|
throw lastError() ?? .genericError(message: "No error message available")
|
|
}
|
|
|
|
return result
|
|
}
|
|
|
|
nonisolated func consensusBranchIdFor(height: Int32) throws -> Int32 {
|
|
let branchId = zcashlc_branch_id_for_height(height, networkType.networkId)
|
|
|
|
guard branchId != -1 else {
|
|
throw RustWeldingError.noConsensusBranchId(height: height)
|
|
}
|
|
|
|
return branchId
|
|
}
|
|
}
|
|
|
|
private extension ZcashRustBackend {
|
|
func throwDataDbError(_ error: RustWeldingError) -> Error {
|
|
if case RustWeldingError.genericError(let message) = error, message.contains("is not empty") {
|
|
return RustWeldingError.dataDbNotEmpty
|
|
}
|
|
|
|
return RustWeldingError.dataDbInitFailed(message: error.localizedDescription)
|
|
}
|
|
|
|
func throwBalanceError(account: Int32, _ error: RustWeldingError?, fallbackMessage: String) -> Error {
|
|
guard let balanceError = error else {
|
|
return RustWeldingError.genericError(message: fallbackMessage)
|
|
}
|
|
|
|
return RustWeldingError.getBalanceError(Int(account), balanceError)
|
|
}
|
|
}
|
|
|
|
private extension URL {
|
|
func osStr() -> (String, UInt) {
|
|
let path = self.absoluteString
|
|
return (path, UInt(path.lengthOfBytes(using: .utf8)))
|
|
}
|
|
|
|
/// use when the rust ffi needs to make filesystem operations
|
|
func osPathStr() -> (String, UInt) {
|
|
let path = self.path
|
|
return (path, UInt(path.lengthOfBytes(using: .utf8)))
|
|
}
|
|
}
|
|
|
|
extension String {
|
|
/**
|
|
Checks whether this string contains null bytes before it's real ending
|
|
*/
|
|
func containsCStringNullBytesBeforeStringEnding() -> Bool {
|
|
self.utf8CString.firstIndex(of: 0) != (self.utf8CString.count - 1)
|
|
}
|
|
}
|
|
|
|
extension FFIBinaryKey {
|
|
/// converts an [`FFIBinaryKey`] into a [`UnifiedSpendingKey`]
|
|
/// - Note: This does not check that the converted value actually holds a valid USK
|
|
func unsafeToUnifiedSpendingKey(network: NetworkType) -> UnifiedSpendingKey {
|
|
.init(
|
|
network: network,
|
|
bytes: self.encoding.toByteArray(
|
|
length: Int(self.encoding_len)
|
|
),
|
|
account: self.account_id
|
|
)
|
|
}
|
|
}
|
|
|
|
extension UnsafeMutablePointer where Pointee == UInt8 {
|
|
/// copies the bytes pointed on
|
|
func toByteArray(length: Int) -> [UInt8] {
|
|
var bytes: [UInt8] = []
|
|
|
|
for index in 0 ..< length {
|
|
bytes.append(self.advanced(by: index).pointee)
|
|
}
|
|
|
|
return bytes
|
|
}
|
|
}
|
|
extension RustWeldingError: LocalizedError {
|
|
var errorDescription: String? {
|
|
switch self {
|
|
case .genericError(let message):
|
|
return "RustWeldingError generic error: \(message)"
|
|
case .dataDbInitFailed(let message):
|
|
return "`RustWeldingError.dataDbInitFailed` with message: \(message)"
|
|
case .dataDbNotEmpty:
|
|
return "`.DataDbNotEmpty`. This is usually not an error."
|
|
case .invalidInput(let message):
|
|
return "`RustWeldingError.invalidInput` with message: \(message)"
|
|
case .malformedStringInput:
|
|
return "`.malformedStringInput` Called a function with a malformed string input."
|
|
case .invalidRewind:
|
|
return "`.invalidRewind` called the rewind API with an arbitrary height that is not valid."
|
|
case .noConsensusBranchId(let branchId):
|
|
return "`.noConsensusBranchId` number \(branchId)"
|
|
case .saplingSpendParametersNotFound:
|
|
return "`.saplingSpendParametersNotFound` sapling parameters not present at specified URL"
|
|
case .unableToDeriveKeys:
|
|
return "`.unableToDeriveKeys` the requested keys could not be derived from the source provided"
|
|
case let .getBalanceError(account, error):
|
|
return "`.getBalanceError` could not retrieve balance from account: \(account), error:\(error)"
|
|
case let .invalidChain(upperBound: upperBound):
|
|
return "`.validateCombinedChain` failed to validate chain. Upper bound: \(upperBound)."
|
|
case let .chainValidationFailed(message):
|
|
return """
|
|
`.validateCombinedChain` failed to validate chain because of error unrelated to chain validity. \
|
|
Message: \(String(describing: message))
|
|
"""
|
|
case .writeBlocksMetadataAllocationProblem:
|
|
return "`.writeBlocksMetadata` failed to allocate memory on Swift side necessary to write blocks metadata to db."
|
|
}
|
|
}
|
|
}
|
|
|
|
extension Array where Element == FFIBlockMeta {
|
|
func deallocateElements() {
|
|
self.forEach { element in
|
|
element.block_hash_ptr.deallocate()
|
|
}
|
|
}
|
|
}
|