218 lines
8.0 KiB
Swift
218 lines
8.0 KiB
Swift
//
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// ZcashSDK.swift
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// ZcashLightClientKit
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//
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// Created by Francisco Gindre on 7/22/21.
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//
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import Foundation
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public protocol ZcashNetwork {
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var networkType: NetworkType { get }
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var constants: NetworkConstants.Type { get }
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}
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public enum NetworkType {
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case mainnet
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case testnet
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var networkId: UInt32 {
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switch self {
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case .mainnet: return 1
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case .testnet: return 0
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}
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}
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}
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extension NetworkType {
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static func forChainName(_ chainame: String) -> NetworkType? {
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switch chainame {
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case "test": return .testnet
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case "main": return .mainnet
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default: return nil
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}
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}
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static func forNetworkId(_ id: UInt32) -> NetworkType? {
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switch id {
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case 1: return .mainnet
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case 0: return .testnet
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default: return nil
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}
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}
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}
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public enum ZcashNetworkBuilder {
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public static func network(for networkType: NetworkType) -> ZcashNetwork {
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switch networkType {
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case .mainnet: return ZcashMainnet()
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case .testnet: return ZcashTestnet()
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}
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}
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}
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class ZcashTestnet: ZcashNetwork {
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var networkType: NetworkType = .testnet
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var constants: NetworkConstants.Type = ZcashSDKTestnetConstants.self
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}
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class ZcashMainnet: ZcashNetwork {
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var networkType: NetworkType = .mainnet
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var constants: NetworkConstants.Type = ZcashSDKMainnetConstants.self
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}
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/**
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Constants of ZcashLightClientKit. this constants don't
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*/
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public enum ZcashSDK {
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/// The number of zatoshi that equal 1 ZEC.
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public static var zatoshiPerZEC: BlockHeight = 100_000_000
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/// The theoretical maximum number of blocks in a reorg, due to other bottlenecks in the protocol design.
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public static var maxReorgSize = 100
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/// The amount of blocks ahead of the current height where new transactions are set to expire. This value is controlled
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/// by the rust backend but it is helpful to know what it is set to and should be kept in sync.
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public static var expiryOffset = 20
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// mark: Defaults
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/// Default size of batches of blocks to request from the compact block service. Which was used both for scanning and downloading.
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/// consider basing your code assumptions on `DefaultDownloadBatch` and `DefaultScanningBatch` instead.
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@available(*, deprecated, message: "this value is being deprecated in favor of `DefaultDownloadBatch` and `DefaultScanningBatch`")
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public static var DefaultBatchSize = 100
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/// Default batch size for downloading blocks for the compact block processor. This value was changed due to
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/// full blocks causing block download memory usage significantly and also timeouts on grpc calls.
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/// this value is subject to change in the future.
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public static var DefaultDownloadBatch = 10
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/// Default batch size for scanning blocks for the compact block processor
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public static var DefaultScanningBatch = 100
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/// Default amount of time, in in seconds, to poll for new blocks. Typically, this should be about half the average
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/// block time.
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public static var defaultPollInterval: TimeInterval = 20
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/// Default attempts at retrying.
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public static var defaultRetries: Int = 5
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/// The default maximum amount of time to wait during retry backoff intervals. Failed loops will never wait longer than
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/// this before retrying.
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public static var defaultMaxBackOffInterval: TimeInterval = 600
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/// Default number of blocks to rewind when a chain reorg is detected. This should be large enough to recover from the
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/// reorg but smaller than the theoretical max reorg size of 100.
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public static var defaultRewindDistance: Int = 10
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/// The number of blocks to allow before considering our data to be stale. This usually helps with what to do when
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/// returning from the background and is exposed via the Synchronizer's isStale function.
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public static var defaultStaleTolerance: Int = 10
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/// Default Name for LibRustZcash data.db
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public static var defaultDataDbName = "data.db"
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/// Default Name for Compact Block caches db
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public static var defaultCacheDbName = "caches.db"
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/// Default name for pending transactions db
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public static var defaultPendingDbName = "pending.db"
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/// File name for the sapling spend params
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public static var spendParamFilename = "sapling-spend.params"
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/// File name for the sapling output params
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public static var outputParamFilename = "sapling-output.params"
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/// The Url that is used by default in zcashd.
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/// We'll want to make this externally configurable, rather than baking it into the SDK but
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/// this will do for now, since we're using a cloudfront URL that already redirects.
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public static var cloudParameterURL = "https://z.cash/downloads/"
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}
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public protocol NetworkConstants {
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/// The height of the first sapling block. When it comes to shielded transactions, we do not need to consider any blocks
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/// prior to this height, at all.
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static var saplingActivationHeight: BlockHeight { get }
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/// Default Name for LibRustZcash data.db
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static var defaultDataDbName: String { get }
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/// Default Name for Compact Block caches db
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static var defaultCacheDbName: String { get }
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/// Default name for pending transactions db
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static var defaultPendingDbName: String { get }
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/// Default prefix for db filenames
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static var defaultDbNamePrefix: String { get }
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/// fixed height where the SDK considers that the ZIP-321 was deployed. This is a workaround
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/// for librustzcash not figuring out the tx fee from the tx itself.
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static var feeChangeHeight: BlockHeight { get }
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@available(*, deprecated, message: "This function will be removed soon. Use the one returning `Zatoshi` instead")
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static func defaultFee(for height: BlockHeight) -> Int64
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/// Returns the default fee according to the blockheight. see [ZIP-313](https://zips.z.cash/zip-0313)
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static func defaultFee(for height: BlockHeight) -> Zatoshi
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}
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public extension NetworkConstants {
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@available(*, deprecated, message: "This function will be removed soon. Use the one returning `Zatoshi` instead")
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static func defaultFee(for height: BlockHeight = BlockHeight.max) -> Int64 {
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guard height >= feeChangeHeight else { return 10_000 }
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return 1_000
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}
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static func defaultFee(for height: BlockHeight = BlockHeight.max) -> Zatoshi {
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guard height >= feeChangeHeight else { return Zatoshi(10_000) }
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return Zatoshi(1_000)
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}
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}
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public class ZcashSDKMainnetConstants: NetworkConstants {
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private init() {}
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/// The height of the first sapling block. When it comes to shielded transactions, we do not need to consider any blocks
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/// prior to this height, at all.
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public static var saplingActivationHeight: BlockHeight = 419_200
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/// Default Name for LibRustZcash data.db
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public static var defaultDataDbName = "data.db"
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/// Default Name for Compact Block caches db
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public static var defaultCacheDbName = "caches.db"
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/// Default name for pending transactions db
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public static var defaultPendingDbName = "pending.db"
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public static var defaultDbNamePrefix = "ZcashSdk_mainnet_"
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public static var feeChangeHeight: BlockHeight = 1_077_550
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}
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public class ZcashSDKTestnetConstants: NetworkConstants {
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private init() {}
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/// The height of the first sapling block. When it comes to shielded transactions, we do not need to consider any blocks
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/// prior to this height, at all.
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public static var saplingActivationHeight: BlockHeight = 280_000
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/// Default Name for LibRustZcash data.db
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public static var defaultDataDbName = "data.db"
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/// Default Name for Compact Block caches db
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public static var defaultCacheDbName = "caches.db"
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/// Default name for pending transactions db
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public static var defaultPendingDbName = "pending.db"
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public static var defaultDbNamePrefix = "ZcashSdk_testnet_"
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/// Estimated height where wallets are supposed to change the fee
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public static var feeChangeHeight: BlockHeight = 1_028_500
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}
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