public static RelayReceipt FromBytes(byte[] bytes)
{
using (var stream = new MemoryStream(bytes))
{
using (var reader = new BinaryReader(stream))
{
var receipt = new RelayReceipt();
receipt.UnserializeData(reader);
return(receipt);
}
}
}
public void SettleChannel(RelayReceipt receipt)
{
var channelIndex = GetIndex(receipt.message.sender, receipt.message.receiver);
// check for possible replay attack
Runtime.Expect(receipt.message.nexus == Runtime.Nexus.Name, "invalid nexus name");
// here we count how many receipts we are implicitly accepting
// this means that we don't need to accept every receipt, allowing skipping several
var receiptCount = 1 + receipt.message.index - channelIndex;
Runtime.Expect(receiptCount > 0, "invalid receipt index");
var expectedFee = RelayFeePerMessage * receiptCount;
var balance = GetBalance(receipt.message.sender);
Runtime.Expect(balance >= expectedFee, "insuficient balance");
var bytes = receipt.message.ToByteArray();
Runtime.Expect(receipt.signature.Verify(bytes, receipt.message.sender), "invalid signature");
balance -= expectedFee;
_balances.Set <Address, BigInteger>(receipt.message.sender, balance);
var key = MakeKey(receipt.message.sender, receipt.message.receiver);
_indices.Set <string, BigInteger>(key, receipt.message.index + 1);
Runtime.Expect(expectedFee > 0, "invalid payout");
var payout = expectedFee / 2;
// send half to the chain
Runtime.Nexus.TransferTokens(Runtime, Nexus.FuelTokenSymbol, this.Address, this.Address, payout);
Runtime.Notify(EventKind.TokenReceive, this.Address, new TokenEventData()
{
chainAddress = this.Address, value = payout, symbol = Nexus.FuelTokenSymbol
});
// send half to the receiver
Runtime.Nexus.TransferTokens(Runtime, Nexus.FuelTokenSymbol, this.Address, receipt.message.receiver, payout);
Runtime.Notify(EventKind.TokenReceive, receipt.message.receiver, new TokenEventData()
{
chainAddress = this.Address, value = payout, symbol = Nexus.FuelTokenSymbol
});
Runtime.Notify(EventKind.ChannelSettle, receipt.message.sender, receiptCount);
}