public override Empty CrossChainReceiveToken(CrossChainReceiveTokenInput input)
{
var transferTransaction = Transaction.Parser.ParseFrom(input.TransferTransactionBytes);
var transferTransactionHash = transferTransaction.GetHash();
Context.LogDebug(() => $"transferTransactionHash == {transferTransactionHash}");
Assert(State.VerifiedCrossChainTransferTransaction[transferTransactionHash] == null,
"Token already claimed.");
var crossChainTransferInput =
CrossChainTransferInput.Parser.ParseFrom(transferTransaction.Params.ToByteArray());
var symbol = crossChainTransferInput.TokenInfo.Symbol;
var amount = crossChainTransferInput.Amount;
var receivingAddress = crossChainTransferInput.To;
var targetChainId = crossChainTransferInput.ToChainId;
Context.LogDebug(() =>
$"symbol == {symbol}, amount == {amount}, receivingAddress == {receivingAddress}, targetChainId == {targetChainId}");
Assert(receivingAddress.Equals(Context.Sender) && targetChainId == Context.ChainId,
"Unable to receive cross chain token.");
if (State.CrossChainContractReferenceState.Value == null)
{
State.CrossChainContractReferenceState.Value =
State.BasicContractZero.GetContractAddressByName.Call(State.CrossChainContractSystemName.Value);
}
var verificationInput = new VerifyTransactionInput
{
TransactionId = transferTransactionHash,
ParentChainHeight = input.ParentChainHeight,
VerifiedChainId = input.FromChainId
};
verificationInput.Path.AddRange(input.MerklePath);
if (State.CrossChainContractReferenceState.Value == null)
{
State.CrossChainContractReferenceState.Value =
State.BasicContractZero.GetContractAddressByName.Call(State.CrossChainContractSystemName.Value);
}
var verificationResult =
State.CrossChainContractReferenceState.VerifyTransaction.Call(verificationInput);
Assert(verificationResult.Value, "Verification failed.");
// Create token if it doesnt exist.
var existing = State.TokenInfos[symbol];
if (existing == null)
{
RegisterTokenInfo(crossChainTransferInput.TokenInfo);
}
State.VerifiedCrossChainTransferTransaction[transferTransactionHash] = input;
var balanceOfReceiver = State.Balances[receivingAddress][symbol];
State.Balances[receivingAddress][symbol] = balanceOfReceiver.Add(amount);
return(new Empty());
}
/// <summary>
/// Receive the token from another chain
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public override Empty CrossChainReceiveToken(CrossChainReceiveTokenInput input)
{
var transferTransaction = Transaction.Parser.ParseFrom(input.TransferTransactionBytes);
var transferTransactionId = transferTransaction.GetHash();
Assert(!State.VerifiedCrossChainTransferTransaction[transferTransactionId],
"Token already claimed.");
var crossChainTransferInput =
CrossChainTransferInput.Parser.ParseFrom(transferTransaction.Params.ToByteArray());
var symbol = crossChainTransferInput.Symbol;
var amount = crossChainTransferInput.Amount;
var receivingAddress = crossChainTransferInput.To;
var targetChainId = crossChainTransferInput.ToChainId;
var transferSender = transferTransaction.From;
var tokenInfo = AssertValidToken(symbol, amount);
int issueChainId = GetIssueChainId(symbol);
Assert(issueChainId == crossChainTransferInput.IssueChainId, "Incorrect issue chain id.");
Assert(transferSender == Context.Sender && targetChainId == Context.ChainId,
"Unable to claim cross chain token.");
var registeredTokenContractAddress = State.CrossChainTransferWhiteList[input.FromChainId];
AssertCrossChainTransaction(transferTransaction, registeredTokenContractAddress,
nameof(CrossChainTransfer));
Context.LogDebug(() =>
$"symbol == {symbol}, amount == {amount}, receivingAddress == {receivingAddress}, targetChainId == {targetChainId}");
CrossChainVerify(transferTransactionId, input.ParentChainHeight, input.FromChainId, input.MerklePath);
State.VerifiedCrossChainTransferTransaction[transferTransactionId] = true;
tokenInfo.Supply = tokenInfo.Supply.Add(amount);
Assert(tokenInfo.Supply <= tokenInfo.TotalSupply, "Total supply exceeded");
State.TokenInfos[symbol] = tokenInfo;
ModifyBalance(receivingAddress, symbol, amount);
Context.Fire(new CrossChainReceived
{
From = transferSender,
To = receivingAddress,
Symbol = symbol,
Amount = amount,
Memo = crossChainTransferInput.Memo,
FromChainId = input.FromChainId,
ParentChainHeight = input.ParentChainHeight,
IssueChainId = issueChainId
});
return(new Empty());
}
