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Transaction.swift
56 lines (47 loc) 路 1.66 KB
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Transaction.swift
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//
// Transaction.swift
// App
//
// Created by Magnus Nevstad on 01/04/2019.
//
import Foundation
public struct Transaction: Codable, Serializable {
/// Transaction inputs, which are sources for coins
public let inputs: [TransactionInput]
/// Transaction outputs, which are destinations for coins
public let outputs: [TransactionOutput]
/// Transaction hash
public var txHash: Data {
get {
return self.serialized().sha256()
}
}
/// Transaction ID
public var txId: String {
return Data(txHash.reversed()).hex
}
/// Coinbase transactions have only one TransactionInput which itself has no previus output reference
public var isCoinbase: Bool {
get {
return inputs.count == 1 && inputs[0].isCoinbase
}
}
public func serialized() -> Data {
var data = Data()
data += inputs.flatMap { $0.serialized() }
data += outputs.flatMap { $0.serialized() }
return data
}
public static func coinbase(address: Data, blockValue: UInt64) -> Transaction {
let coinbaseTxOutPoint = TransactionOutPoint(hash: Data(), index: 0)
let coinbaseTxIn = TransactionInput(previousOutput: coinbaseTxOutPoint, publicKey: address, signature: Data())
let txIns:[TransactionInput] = [coinbaseTxIn]
let txOuts:[TransactionOutput] = [TransactionOutput(value: blockValue, address: address)]
return Transaction(inputs: txIns, outputs: txOuts)
}
}
extension Transaction: Equatable {
public static func == (lhs: Transaction, rhs: Transaction) -> Bool {
return lhs.txHash == rhs.txHash
}
}