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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,14 @@ | ||
| // Copyright (c) 2016 The btcsuite developers | ||
| // Copyright (c) 2016 The Decred developers | ||
| // Licensed under the ISC license. See LICENSE file in the project root for full license information. | ||
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| using System; | ||
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| namespace Paymetheus.Decred | ||
| { | ||
| internal static class Errors | ||
| { | ||
| public static ArgumentOutOfRangeException RequireNonNegative(string paramName) => | ||
| new ArgumentOutOfRangeException(paramName, "Non-negative number required."); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| // Copyright (c) 2016 The btcsuite developers | ||
| // Copyright (c) 2016 The Decred developers | ||
| // Licensed under the ISC license. See LICENSE file in the project root for full license information. | ||
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| namespace Paymetheus.Decred.Util | ||
| { | ||
| public struct TupleValue<T1, T2> | ||
| { | ||
| public TupleValue(T1 item1, T2 item2) | ||
| { | ||
| Item1 = item1; | ||
| Item2 = item2; | ||
| } | ||
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| public T1 Item1 { get; } | ||
| public T2 Item2 { get; } | ||
| } | ||
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| public struct TupleValue<T1, T2, T3> | ||
| { | ||
| public TupleValue(T1 item1, T2 item2, T3 item3) | ||
| { | ||
| Item1 = item1; | ||
| Item2 = item2; | ||
| Item3 = item3; | ||
| } | ||
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| public T1 Item1 { get; } | ||
| public T2 Item2 { get; } | ||
| public T3 Item3 { get; } | ||
| } | ||
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| /// <summary> | ||
| /// TupleValue is an efficient alternative for the System.Tuple types. TupleValue is a | ||
| /// struct (value type) while Tuple is a class (reference type). A similar TupleValue struct | ||
| /// and tuple syntax sugar is planned for C# 7, which would eliminate the need for these | ||
| /// types if added. | ||
| /// </summary> | ||
| public static class TupleValue | ||
| { | ||
| public static TupleValue<T1, T2> Create<T1, T2>(T1 item1, T2 item2) => | ||
| new TupleValue<T1, T2>(item1, item2); | ||
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| public static TupleValue<T1, T2, T3> Create<T1, T2, T3>(T1 item1, T2 item2, T3 item3) => | ||
| new TupleValue<T1, T2, T3>(item1, item2, item3); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| // Copyright (c) 2016 The Decred developers | ||
| // Licensed under the ISC license. See LICENSE file in the project root for full license information. | ||
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| using System; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
| using System.Text; | ||
| using System.Threading.Tasks; | ||
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| namespace Paymetheus.Decred.Wallet | ||
| { | ||
| public struct Balances | ||
| { | ||
| public Balances(Amount total, Amount spendable, Amount locked) | ||
| { | ||
| TotalBalance = total; | ||
| SpendableBalance = spendable; | ||
| LockedBalance = locked; | ||
| } | ||
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| public Amount TotalBalance { get; internal set; } | ||
| public Amount SpendableBalance { get; internal set; } | ||
| public Amount LockedBalance { get; internal set; } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| // Copyright (c) 2016 The btcsuite developers | ||
| // Copyright (c) 2016 The Decred developers | ||
| // Licensed under the ISC license. See LICENSE file in the project root for full license information. | ||
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| using Paymetheus.Decred.Script; | ||
| using System; | ||
| using System.Linq; | ||
| using System.Threading.Tasks; | ||
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| namespace Paymetheus.Decred.Wallet | ||
| { | ||
| public static class TransactionAuthor | ||
| { | ||
| /// <summary> | ||
| /// Provides transaction inputs referencing spendable outputs to construct a | ||
| /// transaction with some target output amount. | ||
| /// </summary> | ||
| /// <param name="target">Target amount the previous output value must meet or exceed.</param> | ||
| /// <returns>Total previous output amount and array of transaction inputs if the target was met.</returns> | ||
| public delegate Task<Tuple<Amount, Transaction.Input[]>> InputSource(Amount target); | ||
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| /// <summary> | ||
| /// Constructs an unsigned transaction by referencing previous unspent outputs. | ||
| /// A change output is added when necessary to return extra value back to the wallet. | ||
| /// </summary> | ||
| /// <param name="outputs">Transaction output array without change.</param> | ||
| /// <param name="changeScript">Output script to pay change to.</param> | ||
| /// <param name="fetchInputsAsync">Input selection source.</param> | ||
| /// <returns>Unsigned transaction and total input amount.</returns> | ||
| /// <exception cref="InsufficientFundsException">Input source was unable to provide enough input value.</exception> | ||
| public static async Task<Tuple<Transaction, Amount>> BuildUnsignedTransaction(Transaction.Output[] outputs, | ||
| OutputScript changeScript, | ||
| Amount feePerKb, | ||
| InputSource fetchInputsAsync) | ||
| { | ||
| if (outputs == null) | ||
| throw new ArgumentNullException(nameof(outputs)); | ||
| if (changeScript == null) | ||
| throw new ArgumentNullException(nameof(changeScript)); | ||
| if (fetchInputsAsync == null) | ||
| throw new ArgumentNullException(nameof(fetchInputsAsync)); | ||
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| var targetAmount = outputs.Sum(o => o.Amount); | ||
| var estimatedSize = Transaction.EstimateSerializeSize(1, outputs, true); | ||
| var targetFee = TransactionFees.FeeForSerializeSize(feePerKb, estimatedSize); | ||
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| while (true) | ||
| { | ||
| var funding = await fetchInputsAsync(targetAmount + targetFee); | ||
| var inputAmount = funding.Item1; | ||
| var inputs = funding.Item2; | ||
| if (inputAmount < targetAmount + targetFee) | ||
| { | ||
| throw new InsufficientFundsException(); | ||
| } | ||
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| var unsignedTransaction = new Transaction(Transaction.SupportedVersion, inputs, outputs, 0, 0); | ||
| if (inputAmount > targetAmount + targetFee) | ||
| { | ||
| unsignedTransaction = TransactionFees.AddChange(unsignedTransaction, inputAmount, | ||
| changeScript, feePerKb); | ||
| } | ||
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| if (TransactionFees.EstimatedFeePerKb(unsignedTransaction, inputAmount) < feePerKb) | ||
| { | ||
| estimatedSize = Transaction.EstimateSerializeSize(inputs.Length, outputs, true); | ||
| targetFee = TransactionFees.FeeForSerializeSize(feePerKb, estimatedSize); | ||
| } | ||
| else | ||
| { | ||
| return Tuple.Create(unsignedTransaction, inputAmount); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| public class InsufficientFundsException : Exception | ||
| { | ||
| public InsufficientFundsException() : base("Insufficient funds available to construct transaction.") { } | ||
| } | ||
| } | ||
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