/// <summary>
/// Method that SendNativeAsset, TransferNep5 and CallContract uses to create the inputs and outputs of the transaction.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="tx"></param>
/// <param name="from"></param>
/// <param name="changeAddress"></param>
/// <param name="fee"></param>
/// <returns></returns>
private T MakeTransaction <T>(T tx, UInt160 from = null, UInt160 changeAddress = null, Fixed8 fee = default(Fixed8)) where T : Transaction
{
if (tx.Outputs == null)
{
tx.Outputs = new TransactionOutput[0];
}
if (tx.Attributes == null)
{
tx.Attributes = new TransactionAttribute[0];
}
if (from == null)
{
from = AddressScriptHash;
}
fee += tx.SystemFee;
var payTotal = tx.Outputs.GroupBy(p => p.AssetId, (k, g) => new
{
AssetId = k,
Value = g.Sum(p => p.Value)
}).ToDictionary(p => p.AssetId);
if (fee > Fixed8.Zero)
{
if (payTotal.ContainsKey(Utils.GasToken))
{
payTotal[Utils.GasToken] = new
{
AssetId = Utils.GasToken,
Value = payTotal[Utils.GasToken].Value + fee
};
}
else
{
payTotal.Add(Utils.GasToken, new
{
AssetId = Utils.GasToken,
Value = fee
});
}
}
var payCoins = payTotal.Select(async p => new
{
AssetId = p.Key,
Unspents = await TransactionBuilderHelper.FindUnspentCoins(p.Key, p.Value.Value, from, _restService)
}).Select(x => x.Result).ToDictionary(p => p.AssetId);
if (payCoins.Any(p => p.Value.Unspents == null))
{
return(null);
}
var inputSum = payCoins.Values.ToDictionary(p => p.AssetId, p => new
{
p.AssetId,
Value = p.Unspents.Sum(q => q.Output.Value)
});
if (changeAddress == null)
{
changeAddress = from;
}
List <TransactionOutput> outputsNew = new List <TransactionOutput>(tx.Outputs);
foreach (UInt256 assetId in inputSum.Keys)
{
if (inputSum[assetId].Value > payTotal[assetId].Value)
{
outputsNew.Add(new TransactionOutput
{
AssetId = assetId,
Value = inputSum[assetId].Value - payTotal[assetId].Value,
ScriptHash = changeAddress
});
}
}
tx.Inputs = payCoins.Values.SelectMany(p => p.Unspents).Select(p => p.Reference).ToArray();
tx.Outputs = outputsNew.ToArray();
return(tx);
}
