public static TransferNotifyItem GetTransferNotify(this VmArray notifyArray, UInt160 asset)
{
if (notifyArray.Count < 4)
{
return(null);
}
// Event name should be encoded as a byte array.
if (notifyArray[0].NotVmByteArray())
{
return(null);
}
var eventName = notifyArray[0].GetString();
if (eventName != "Transfer")
{
return(null);
}
var fromItem = notifyArray[1];
if (fromItem.NotVmByteArray() && fromItem.NotVmNull())
{
return(null);
}
var fromBytes = fromItem.GetByteSafely();
if (fromBytes?.Length != 20)
{
fromBytes = null;
}
var toItem = notifyArray[2];
if (toItem != null && toItem.NotVmByteArray())
{
return(null);
}
byte[] toBytes = toItem.GetByteSafely();
if (toBytes?.Length != 20)
{
toBytes = null;
}
if (fromBytes == null && toBytes == null)
{
return(null);
}
var amountItem = notifyArray[3];
if (amountItem.NotVmByteArray() && amountItem.NotVmInt())
{
return(null);
}
var transfer = new TransferNotifyItem()
{
Asset = asset,
From = fromBytes == null ? null : new UInt160(fromBytes),
To = new UInt160(toBytes),
Amount = amountItem.GetBigInteger(),
};
return(transfer);
}
/// <summary>
/// convert to Big Endian hex string without "Ox"
/// </summary>
/// <param name="address"></param>
/// <returns></returns>
public static string ToBigEndianHex(this UInt160 address)
{
return(address.ToArray().ToHexString(reverse: true));
}
/// <summary>
/// convert bigint to asset decimal value
/// </summary>
/// <param name="amount"></param>
/// <param name="assetId"></param>
/// <returns></returns>
public static (BigDecimal amount, AssetInfo asset) GetAssetAmount(this BigInteger amount, UInt160 assetId)
{
var asset = AssetCache.GetAssetInfo(assetId);
if (asset == null)
{
return(new BigDecimal(0, 0), null);
}
return(new BigDecimal(amount, asset.Decimals), asset);
}
/// <summary>
/// query balance
/// </summary>
/// <param name="address"></param>
/// <param name="assetId"></param>
/// <returns></returns>
public static BigDecimal GetBalanceOf(this UInt160 address, UInt160 assetId)
{
using var snapshot = Blockchain.Singleton.GetSnapshot();
return(GetBalanceOf(address, assetId, snapshot));
}
/// <summary>
/// query balance
/// </summary>
/// <param name="addresses"></param>
/// <param name="assetId"></param>
/// <param name="snapshot"></param>
/// <returns></returns>
public static List <BigDecimal> GetBalanceOf(this IEnumerable <UInt160> addresses, UInt160 assetId, StoreView snapshot)
{
var assetInfo = AssetCache.GetAssetInfo(assetId, snapshot);
if (assetInfo == null)
{
throw new ArgumentException($"invalid assetId:[{assetId}]");
}
using var sb = new ScriptBuilder();
foreach (var address in addresses)
{
sb.EmitAppCall(assetId, "balanceOf", address);
}
using ApplicationEngine engine = ApplicationEngine.Run(sb.ToArray(), snapshot, testMode: true);
if (engine.State.HasFlag(VMState.FAULT))
{
throw new Exception($"query balance error");
}
var result = engine.ResultStack.Select(p => p.GetBigInteger());
return(result.Select(bigInt => new BigDecimal(bigInt, assetInfo.Decimals)).ToList());
}
/// <summary>
/// query balance
/// </summary>
/// <param name="addresses"></param>
/// <param name="assetId"></param>
/// <returns></returns>
public static List <BigDecimal> GetBalanceOf(this IEnumerable <UInt160> addresses, UInt160 assetId)
{
using var snapshot = Blockchain.Singleton.GetSnapshot();
return(GetBalanceOf(addresses, assetId, snapshot));
}