// send to external chain
public void WithdrawTokens(Address from, Address to, string symbol, BigInteger amount)
{
Runtime.Expect(amount > 0, "amount must be positive and greater than zero");
Runtime.Expect(Runtime.IsWitness(from), "invalid witness");
Runtime.Expect(from.IsUser, "source must be user address");
Runtime.Expect(to.IsInterop, "destination must be interop address");
Runtime.Expect(Runtime.TokenExists(symbol), "invalid token");
var transferTokenInfo = this.Runtime.GetToken(symbol);
Runtime.Expect(transferTokenInfo.Flags.HasFlag(TokenFlags.Transferable), "transfer token must be transferable");
Runtime.Expect(transferTokenInfo.Flags.HasFlag(TokenFlags.External), "transfer token must be external");
Runtime.Expect(transferTokenInfo.Flags.HasFlag(TokenFlags.Fungible), "transfer token must be fungible");
string platform;
byte[] dummy;
to.DecodeInterop(out platform, out dummy, 0);
Runtime.Expect(platform != DomainSettings.PlatformName, "must be external platform");
Runtime.Expect(Runtime.PlatformExists(platform), "invalid platform");
var platformInfo = Runtime.GetPlatform(platform);
Runtime.Expect(to != platformInfo.Address, "invalid target address");
var feeSymbol = platformInfo.Symbol;
Runtime.Expect(Runtime.TokenExists(feeSymbol), "invalid fee token");
var feeTokenInfo = this.Runtime.GetToken(feeSymbol);
Runtime.Expect(feeTokenInfo.Flags.HasFlag(TokenFlags.Fungible), "fee token must be fungible");
Runtime.Expect(feeTokenInfo.Flags.HasFlag(TokenFlags.Transferable), "fee token must be transferable");
var basePrice = UnitConversion.GetUnitValue(DomainSettings.FiatTokenDecimals) / InteropFeeRacio; // 50cents
var feeAmount = Runtime.GetTokenQuote(DomainSettings.FiatTokenSymbol, feeSymbol, basePrice);
Runtime.Expect(feeAmount > 0, "fee is too small");
Runtime.Expect(Runtime.TransferTokens(feeSymbol, from, this.Address, feeAmount), "fee transfer failed");
Runtime.Expect(Runtime.TransferTokens(symbol, from, platformInfo.Address, amount), "burn failed");
var collateralAmount = Runtime.GetTokenQuote(DomainSettings.FiatTokenSymbol, DomainSettings.FuelTokenSymbol, basePrice);
var withdraw = new InteropWithdraw()
{
destination = to,
transferAmount = amount,
transferSymbol = symbol,
feeAmount = feeAmount,
feeSymbol = feeSymbol,
hash = Runtime.Transaction.Hash,
broker = Address.Null,
collateralAmount = collateralAmount,
timestamp = Runtime.Time
};
_withdraws.Add <InteropWithdraw>(withdraw);
Runtime.Notify(EventKind.TokenSend, from, new TokenEventData()
{
chainAddress = this.Address, value = amount, symbol = symbol
});
Runtime.Notify(EventKind.TokenEscrow, from, new TokenEventData()
{
chainAddress = this.Address, value = feeAmount, symbol = symbol
});
Runtime.Notify(EventKind.BrokerRequest, from, to);
}
// send to external chain
public void WithdrawTokens(Address from, Address to, string symbol, BigInteger amount)
{
Runtime.Expect(amount > 0, "amount must be positive and greater than zero");
Runtime.Expect(Runtime.IsWitness(from), "invalid witness");
Runtime.Expect(from.IsUser, "source must be user address");
Runtime.Expect(to.IsInterop, "destination must be interop address");
Runtime.Expect(Runtime.TokenExists(symbol), "invalid token");
var transferTokenInfo = this.Runtime.GetToken(symbol);
Runtime.Expect(transferTokenInfo.Flags.HasFlag(TokenFlags.Transferable), "transfer token must be transferable");
Runtime.Expect(transferTokenInfo.Flags.HasFlag(TokenFlags.External), "transfer token must be external");
Runtime.Expect(transferTokenInfo.Flags.HasFlag(TokenFlags.Fungible), "transfer token must be fungible");
byte platformID;
byte[] dummy;
to.DecodeInterop(out platformID, out dummy);
Runtime.Expect(platformID > 0, "invalid platform ID");
var platform = Runtime.GetPlatformByIndex(platformID);
Runtime.Expect(platform != null, "invalid platform");
int interopIndex = -1;
for (int i = 0; i < platform.InteropAddresses.Length; i++)
{
if (platform.InteropAddresses[i].LocalAddress == to)
{
interopIndex = i;
break;
}
}
Runtime.Expect(interopIndex == -1, "invalid target address");
var feeSymbol = platform.Symbol;
Runtime.Expect(Runtime.TokenExists(feeSymbol), "invalid fee token");
var feeTokenInfo = this.Runtime.GetToken(feeSymbol);
Runtime.Expect(feeTokenInfo.Flags.HasFlag(TokenFlags.Fungible), "fee token must be fungible");
Runtime.Expect(feeTokenInfo.Flags.HasFlag(TokenFlags.Transferable), "fee token must be transferable");
var basePrice = Runtime.GetGovernanceValue(InteropFeeTag);
var feeAmount = Runtime.GetTokenQuote(DomainSettings.FiatTokenSymbol, feeSymbol, basePrice);
Runtime.Expect(feeAmount > 0, "fee is too small");
Runtime.TransferTokens(feeSymbol, from, this.Address, feeAmount);
// TODO support NFT
Runtime.SwapTokens(Runtime.Chain.Name, from, platform.Name, to, symbol, amount, null, null);
var withdraw = new InteropWithdraw()
{
destination = to,
transferAmount = amount,
transferSymbol = symbol,
feeAmount = feeAmount,
feeSymbol = feeSymbol,
hash = Runtime.Transaction.Hash,
timestamp = Runtime.Time
};
_withdraws.Add <InteropWithdraw>(withdraw);
}
