public void Update()
{
int height = Services.BlockExplorerService.GetCurrentHeight();
CycleParameters cycle;
CyclePhase phase;
if (ClientChannelNegotiation == null)
{
cycle = Parameters.CycleGenerator.GetRegistratingCycle(height);
phase = CyclePhase.Registration;
}
else
{
cycle = ClientChannelNegotiation.GetCycle();
var phases = new CyclePhase[]
{
CyclePhase.Registration,
CyclePhase.ClientChannelEstablishment,
CyclePhase.TumblerChannelEstablishment,
CyclePhase.PaymentPhase,
CyclePhase.TumblerCashoutPhase,
CyclePhase.ClientCashoutPhase
};
if (!phases.Any(p => cycle.IsInPhase(p, height)))
{
return;
}
phase = phases.First(p => cycle.IsInPhase(p, height));
}
Logs.Client.LogInformation(Environment.NewLine);
var period = cycle.GetPeriods().GetPeriod(phase);
var blocksLeft = period.End - height;
Logs.Client.LogInformation($"Cycle {cycle.Start} ({Status})");
Logs.Client.LogInformation($"{cycle.ToString(height)} in phase {phase} ({blocksLeft} more blocks)");
var previousState = Status;
TumblerClient bob = null, alice = null;
try
{
var correlation = SolverClientSession == null ? CorrelationId.Zero : new CorrelationId(SolverClientSession.Id);
FeeRate feeRate = null;
switch (phase)
{
case CyclePhase.Registration:
if (ClientChannelNegotiation == null)
{
bob = Runtime.CreateTumblerClient(cycle.Start, Identity.Bob);
//Client asks for voucher
var voucherResponse = bob.AskUnsignedVoucher();
//Client ensures he is in the same cycle as the tumbler (would fail if one tumbler or client's chain isn't sync)
var tumblerCycle = Parameters.CycleGenerator.GetCycle(voucherResponse.CycleStart);
Assert(tumblerCycle.Start == cycle.Start, "invalid-phase");
//Saving the voucher for later
StartCycle = cycle.Start;
ClientChannelNegotiation = new ClientChannelNegotiation(Parameters, cycle.Start);
ClientChannelNegotiation.ReceiveUnsignedVoucher(voucherResponse);
Status = PaymentStateMachineStatus.Registered;
}
break;
case CyclePhase.ClientChannelEstablishment:
if (ClientChannelNegotiation.Status == TumblerClientSessionStates.WaitingTumblerClientTransactionKey)
{
alice = Runtime.CreateTumblerClient(cycle.Start, Identity.Alice);
var key = alice.RequestTumblerEscrowKey();
ClientChannelNegotiation.ReceiveTumblerEscrowKey(key.PubKey, key.KeyIndex);
//Client create the escrow
var escrowTxOut = ClientChannelNegotiation.BuildClientEscrowTxOut();
feeRate = GetFeeRate();
Transaction clientEscrowTx = null;
try
{
clientEscrowTx = Services.WalletService.FundTransactionAsync(escrowTxOut, feeRate).GetAwaiter().GetResult();
}
catch (NotEnoughFundsException ex)
{
Logs.Client.LogInformation($"Not enough funds in the wallet to tumble. Missing about {ex.Missing}. Denomination is {Parameters.Denomination}.");
break;
}
var redeemDestination = Services.WalletService.GenerateAddress().ScriptPubKey;
var channelId = new uint160(RandomUtils.GetBytes(20));
SolverClientSession = ClientChannelNegotiation.SetClientSignedTransaction(channelId, clientEscrowTx, redeemDestination);
correlation = new CorrelationId(SolverClientSession.Id);
Tracker.AddressCreated(cycle.Start, TransactionType.ClientEscrow, escrowTxOut.ScriptPubKey, correlation);
Tracker.TransactionCreated(cycle.Start, TransactionType.ClientEscrow, clientEscrowTx.GetHash(), correlation);
Services.BlockExplorerService.TrackAsync(escrowTxOut.ScriptPubKey).GetAwaiter().GetResult();
var redeemTx = SolverClientSession.CreateRedeemTransaction(feeRate);
Tracker.AddressCreated(cycle.Start, TransactionType.ClientRedeem, redeemDestination, correlation);
//redeemTx does not be to be recorded to the tracker, this is TrustedBroadcastService job
Services.BroadcastService.BroadcastAsync(clientEscrowTx).GetAwaiter().GetResult();
Services.TrustedBroadcastService.Broadcast(cycle.Start, TransactionType.ClientRedeem, correlation, redeemTx);
Status = PaymentStateMachineStatus.ClientChannelBroadcasted;
}
else if (ClientChannelNegotiation.Status == TumblerClientSessionStates.WaitingSolvedVoucher)
{
alice = Runtime.CreateTumblerClient(cycle.Start, Identity.Alice);
TransactionInformation clientTx = GetTransactionInformation(SolverClientSession.EscrowedCoin, true);
var state = ClientChannelNegotiation.GetInternalState();
if (clientTx != null && clientTx.Confirmations >= cycle.SafetyPeriodDuration)
{
Logs.Client.LogInformation($"Client escrow reached {cycle.SafetyPeriodDuration} confirmations");
//Client asks the public key of the Tumbler and sends its own
var voucher = alice.SignVoucher(new SignVoucherRequest
{
MerkleProof = clientTx.MerkleProof,
Transaction = clientTx.Transaction,
KeyReference = state.TumblerEscrowKeyReference,
UnsignedVoucher = state.BlindedVoucher,
Cycle = cycle.Start,
ClientEscrowKey = state.ClientEscrowKey.PubKey,
ChannelId = SolverClientSession.Id
});
ClientChannelNegotiation.CheckVoucherSolution(voucher);
Status = PaymentStateMachineStatus.TumblerVoucherObtained;
}
}
break;
case CyclePhase.TumblerChannelEstablishment:
bob = Runtime.CreateTumblerClient(cycle.Start, Identity.Bob);
if (Status == PaymentStateMachineStatus.TumblerVoucherObtained)
{
Logs.Client.LogInformation("Begin ask to open the channel...");
//Client asks the Tumbler to make a channel
var bobEscrowInformation = ClientChannelNegotiation.GetOpenChannelRequest();
uint160 channelId = null;
try
{
channelId = bob.BeginOpenChannel(bobEscrowInformation);
}
catch (Exception ex)
{
if (ex.Message.Contains("tumbler-insufficient-funds"))
{
Logs.Client.LogWarning("The tumbler server has not enough funds and can't open a channel for now");
break;
}
throw;
}
ClientChannelNegotiation.SetChannelId(channelId);
Status = PaymentStateMachineStatus.TumblerChannelCreating;
}
else if (Status == PaymentStateMachineStatus.TumblerChannelCreating)
{
var tumblerEscrow = bob.EndOpenChannel(cycle.Start, ClientChannelNegotiation.GetInternalState().ChannelId);
if (tumblerEscrow == null)
{
Logs.Client.LogInformation("Tumbler escrow still creating...");
break;
}
PromiseClientSession = ClientChannelNegotiation.ReceiveTumblerEscrowedCoin(tumblerEscrow);
Logs.Client.LogInformation("Tumbler escrow broadcasted");
//Tell to the block explorer we need to track that address (for checking if it is confirmed in payment phase)
Services.BlockExplorerService.TrackAsync(PromiseClientSession.EscrowedCoin.ScriptPubKey).GetAwaiter().GetResult();
Tracker.AddressCreated(cycle.Start, TransactionType.TumblerEscrow, PromiseClientSession.EscrowedCoin.ScriptPubKey, correlation);
Tracker.TransactionCreated(cycle.Start, TransactionType.TumblerEscrow, PromiseClientSession.EscrowedCoin.Outpoint.Hash, correlation);
//Channel is done, now need to run the promise protocol to get valid puzzle
var cashoutDestination = DestinationWallet.GetNewDestination();
Tracker.AddressCreated(cycle.Start, TransactionType.TumblerCashout, cashoutDestination, correlation);
feeRate = GetFeeRate();
var sigReq = PromiseClientSession.CreateSignatureRequest(cashoutDestination, feeRate);
var commitments = bob.SignHashes(PromiseClientSession.Id, sigReq);
var revelation = PromiseClientSession.Reveal(commitments);
var proof = bob.CheckRevelation(PromiseClientSession.Id, revelation);
var puzzle = PromiseClientSession.CheckCommitmentProof(proof);
SolverClientSession.AcceptPuzzle(puzzle[0]);
Status = PaymentStateMachineStatus.TumblerChannelBroadcasted;
}
else if (Status == PaymentStateMachineStatus.TumblerChannelBroadcasted)
{
CheckTumblerChannelConfirmed(cycle);
}
break;
case CyclePhase.PaymentPhase:
//Could have confirmed during safe period
//Only check for the first block when period start,
//else Tumbler can know deanonymize you based on the timing of first Alice request if the transaction was not confirmed previously
if (Status == PaymentStateMachineStatus.TumblerChannelBroadcasted && height == period.Start)
{
CheckTumblerChannelConfirmed(cycle);
}
if (PromiseClientSession != null && Status == PaymentStateMachineStatus.TumblerChannelConfirmed)
{
TransactionInformation tumblerTx = GetTransactionInformation(PromiseClientSession.EscrowedCoin, false);
//Ensure the tumbler coin is confirmed before paying anything
if (tumblerTx != null && tumblerTx.Confirmations >= cycle.SafetyPeriodDuration)
{
if (SolverClientSession.Status == SolverClientStates.WaitingGeneratePuzzles)
{
feeRate = GetFeeRate();
alice = Runtime.CreateTumblerClient(cycle.Start, Identity.Alice);
var puzzles = SolverClientSession.GeneratePuzzles();
var commmitments = alice.SolvePuzzles(SolverClientSession.Id, puzzles);
var revelation2 = SolverClientSession.Reveal(commmitments);
var solutionKeys = alice.CheckRevelation(SolverClientSession.Id, revelation2);
var blindFactors = SolverClientSession.GetBlindFactors(solutionKeys);
var offerInformation = alice.CheckBlindFactors(SolverClientSession.Id, blindFactors);
var offerSignature = SolverClientSession.SignOffer(offerInformation);
var offerRedeem = SolverClientSession.CreateOfferRedeemTransaction(feeRate);
//May need to find solution in the fulfillment transaction
Services.BlockExplorerService.TrackAsync(offerRedeem.PreviousScriptPubKey).GetAwaiter().GetResult();
Tracker.AddressCreated(cycle.Start, TransactionType.ClientOfferRedeem, SolverClientSession.GetInternalState().RedeemDestination, correlation);
Services.TrustedBroadcastService.Broadcast(cycle.Start, TransactionType.ClientOfferRedeem, correlation, offerRedeem);
try
{
solutionKeys = alice.FulfillOffer(SolverClientSession.Id, offerSignature);
SolverClientSession.CheckSolutions(solutionKeys);
var tumblingSolution = SolverClientSession.GetSolution();
// TODO: Figure out which puzzle is passed here.
var transaction = PromiseClientSession.GetSignedTransaction(tumblingSolution, 0);
Logs.Client.LogInformation("Got puzzle solution cooperatively from the tumbler");
Status = PaymentStateMachineStatus.PuzzleSolutionObtained;
Services.TrustedBroadcastService.Broadcast(cycle.Start, TransactionType.TumblerCashout, correlation, new TrustedBroadcastRequest()
{
BroadcastAt = cycle.GetPeriods().ClientCashout.Start,
Transaction = transaction
});
if (Cooperative)
{
var signature = SolverClientSession.SignEscape();
// No need to await for it, it is a just nice for the tumbler (we don't want the underlying socks connection cut before the escape key is sent)
alice.GiveEscapeKeyAsync(SolverClientSession.Id, signature).GetAwaiter().GetResult();
Logs.Client.LogInformation("Gave escape signature to the tumbler");
}
}
catch (Exception ex)
{
Status = PaymentStateMachineStatus.UncooperativeTumbler;
Logs.Client.LogWarning("The tumbler did not gave puzzle solution cooperatively");
Logs.Client.LogWarning(ex.ToString());
}
}
}
}
break;
case CyclePhase.ClientCashoutPhase:
if (SolverClientSession != null)
{
//If the tumbler is uncooperative, he published solutions on the blockchain
if (SolverClientSession.Status == SolverClientStates.WaitingPuzzleSolutions)
{
var transactions = Services.BlockExplorerService.GetTransactions(SolverClientSession.GetInternalState().OfferCoin.ScriptPubKey, false);
if (transactions.Count != 0)
{
SolverClientSession.CheckSolutions(transactions.Select(t => t.Transaction).ToArray());
Logs.Client.LogInformation("Puzzle solution recovered from tumbler's fulfill transaction");
Status = PaymentStateMachineStatus.PuzzleSolutionObtained;
var tumblingSolution = SolverClientSession.GetSolution();
// TODO: Figure out which puzzle is passed here.
var transaction = PromiseClientSession.GetSignedTransaction(tumblingSolution, 0);
Tracker.TransactionCreated(cycle.Start, TransactionType.TumblerCashout, transaction.GetHash(), correlation);
Services.BroadcastService.BroadcastAsync(transaction).GetAwaiter().GetResult();
}
}
}
break;
}
}
finally
{
if (previousState != Status)
{
Logs.Client.LogInformation($"Status changed {previousState} => {Status}");
}
if (alice != null && bob != null)
{
throw new InvalidOperationException("Bob and Alice have been both initialized, please report the bug to NTumbleBit developers");
}
if (alice != null)
{
alice.Dispose();
}
if (bob != null)
{
bob.Dispose();
}
}
}
public void Update()
{
int height = Services.BlockExplorerService.GetCurrentHeight();
CycleParameters cycle;
CyclePhase phase;
if (ClientChannelNegotiation == null)
{
cycle = Parameters.CycleGenerator.GetRegistratingCycle(height);
phase = CyclePhase.Registration;
}
else
{
cycle = ClientChannelNegotiation.GetCycle();
var phases = new CyclePhase[]
{
CyclePhase.Registration,
CyclePhase.ClientChannelEstablishment,
CyclePhase.TumblerChannelEstablishment,
CyclePhase.PaymentPhase,
CyclePhase.TumblerCashoutPhase,
CyclePhase.ClientCashoutPhase
};
if (!phases.Any(p => cycle.IsInPhase(p, height)))
{
return;
}
phase = phases.First(p => cycle.IsInPhase(p, height));
}
Logs.Client.LogInformation("[[[Updating cycle " + cycle.Start + "]]]");
Logs.Client.LogInformation("Phase " + Enum.GetName(typeof(CyclePhase), phase) + ", ending in " + (cycle.GetPeriods().GetPeriod(phase).End - height) + " blocks");
TumblerClient bob = null, alice = null;
try
{
var correlation = SolverClientSession == null ? 0 : GetCorrelation(SolverClientSession.EscrowedCoin);
FeeRate feeRate = null;
switch (phase)
{
case CyclePhase.Registration:
if (ClientChannelNegotiation == null)
{
bob = Runtime.CreateTumblerClient(cycle.Start, Identity.Bob);
//Client asks for voucher
var voucherResponse = bob.AskUnsignedVoucher();
//Client ensures he is in the same cycle as the tumbler (would fail if one tumbler or client's chain isn't sync)
var tumblerCycle = Parameters.CycleGenerator.GetCycle(voucherResponse.CycleStart);
Assert(tumblerCycle.Start == cycle.Start, "invalid-phase");
//Saving the voucher for later
StartCycle = cycle.Start;
ClientChannelNegotiation = new ClientChannelNegotiation(Parameters, cycle.Start);
ClientChannelNegotiation.ReceiveUnsignedVoucher(voucherResponse);
Logs.Client.LogInformation("Registered");
}
break;
case CyclePhase.ClientChannelEstablishment:
if (ClientChannelNegotiation.Status == TumblerClientSessionStates.WaitingTumblerClientTransactionKey)
{
alice = Runtime.CreateTumblerClient(cycle.Start, Identity.Alice);
var key = alice.RequestTumblerEscrowKey();
ClientChannelNegotiation.ReceiveTumblerEscrowKey(key.PubKey, key.KeyIndex);
//Client create the escrow
var escrowTxOut = ClientChannelNegotiation.BuildClientEscrowTxOut();
feeRate = GetFeeRate();
Transaction clientEscrowTx = null;
try
{
clientEscrowTx = Services.WalletService.FundTransaction(escrowTxOut, feeRate);
}
catch (NotEnoughFundsException ex)
{
Logs.Client.LogInformation($"Not enough funds in the wallet to tumble. Missing about {ex.Missing}. Denomination is {Parameters.Denomination}.");
break;
}
var redeemDestination = Services.WalletService.GenerateAddress().ScriptPubKey;
SolverClientSession = ClientChannelNegotiation.SetClientSignedTransaction(clientEscrowTx, redeemDestination);
correlation = GetCorrelation(SolverClientSession.EscrowedCoin);
Tracker.AddressCreated(cycle.Start, TransactionType.ClientEscrow, escrowTxOut.ScriptPubKey, correlation);
Tracker.TransactionCreated(cycle.Start, TransactionType.ClientEscrow, clientEscrowTx.GetHash(), correlation);
Services.BlockExplorerService.Track(escrowTxOut.ScriptPubKey);
var redeemTx = SolverClientSession.CreateRedeemTransaction(feeRate);
Tracker.AddressCreated(cycle.Start, TransactionType.ClientRedeem, redeemDestination, correlation);
//redeemTx does not be to be recorded to the tracker, this is TrustedBroadcastService job
Services.BroadcastService.Broadcast(clientEscrowTx);
Services.TrustedBroadcastService.Broadcast(cycle.Start, TransactionType.ClientRedeem, correlation, redeemTx);
Logs.Client.LogInformation("Client channel broadcasted");
}
else if (ClientChannelNegotiation.Status == TumblerClientSessionStates.WaitingSolvedVoucher)
{
alice = Runtime.CreateTumblerClient(cycle.Start, Identity.Alice);
TransactionInformation clientTx = GetTransactionInformation(SolverClientSession.EscrowedCoin, true);
var state = ClientChannelNegotiation.GetInternalState();
if (clientTx != null && clientTx.Confirmations >= cycle.SafetyPeriodDuration)
{
Logs.Client.LogInformation($"Client escrow reached {cycle.SafetyPeriodDuration} confirmations");
//Client asks the public key of the Tumbler and sends its own
var voucher = alice.SignVoucher(new SignVoucherRequest
{
MerkleProof = clientTx.MerkleProof,
Transaction = clientTx.Transaction,
KeyReference = state.TumblerEscrowKeyReference,
UnsignedVoucher = state.BlindedVoucher,
Cycle = cycle.Start,
ClientEscrowKey = state.ClientEscrowKey.PubKey
});
ClientChannelNegotiation.CheckVoucherSolution(voucher);
Logs.Client.LogInformation($"Tumbler escrow voucher obtained");
}
}
break;
case CyclePhase.TumblerChannelEstablishment:
if (ClientChannelNegotiation != null && ClientChannelNegotiation.Status == TumblerClientSessionStates.WaitingGenerateTumblerTransactionKey)
{
bob = Runtime.CreateTumblerClient(cycle.Start, Identity.Bob);
//Client asks the Tumbler to make a channel
var bobEscrowInformation = ClientChannelNegotiation.GetOpenChannelRequest();
var tumblerInformation = bob.OpenChannel(bobEscrowInformation);
PromiseClientSession = ClientChannelNegotiation.ReceiveTumblerEscrowedCoin(tumblerInformation);
Logs.Client.LogInformation("Tumbler escrow broadcasted");
//Tell to the block explorer we need to track that address (for checking if it is confirmed in payment phase)
Services.BlockExplorerService.Track(PromiseClientSession.EscrowedCoin.ScriptPubKey);
Tracker.AddressCreated(cycle.Start, TransactionType.TumblerEscrow, PromiseClientSession.EscrowedCoin.ScriptPubKey, correlation);
Tracker.TransactionCreated(cycle.Start, TransactionType.TumblerEscrow, PromiseClientSession.EscrowedCoin.Outpoint.Hash, correlation);
//Channel is done, now need to run the promise protocol to get valid puzzle
var cashoutDestination = DestinationWallet.GetNewDestination();
Tracker.AddressCreated(cycle.Start, TransactionType.TumblerCashout, cashoutDestination, correlation);
feeRate = GetFeeRate();
var sigReq = PromiseClientSession.CreateSignatureRequest(cashoutDestination, feeRate);
var commiments = bob.SignHashes(PromiseClientSession.Id, sigReq);
var revelation = PromiseClientSession.Reveal(commiments);
var proof = bob.CheckRevelation(PromiseClientSession.Id, revelation);
var puzzle = PromiseClientSession.CheckCommitmentProof(proof);
SolverClientSession.AcceptPuzzle(puzzle);
Logs.Client.LogInformation("Tumbler escrow puzzle obtained");
}
break;
case CyclePhase.PaymentPhase:
if (PromiseClientSession != null)
{
TransactionInformation tumblerTx = GetTransactionInformation(PromiseClientSession.EscrowedCoin, false);
//Ensure the tumbler coin is confirmed before paying anything
if (tumblerTx != null || tumblerTx.Confirmations >= cycle.SafetyPeriodDuration)
{
Logs.Client.LogInformation($"Client escrow reached {cycle.SafetyPeriodDuration} confirmations");
if (SolverClientSession.Status == SolverClientStates.WaitingGeneratePuzzles)
{
feeRate = GetFeeRate();
alice = Runtime.CreateTumblerClient(cycle.Start, Identity.Alice);
var puzzles = SolverClientSession.GeneratePuzzles();
var commmitments = alice.SolvePuzzles(SolverClientSession.Id, puzzles);
var revelation2 = SolverClientSession.Reveal(commmitments);
var solutionKeys = alice.CheckRevelation(SolverClientSession.Id, revelation2);
var blindFactors = SolverClientSession.GetBlindFactors(solutionKeys);
var offerInformation = alice.CheckBlindFactors(SolverClientSession.Id, blindFactors);
var offerSignature = SolverClientSession.SignOffer(offerInformation);
var offerRedeem = SolverClientSession.CreateOfferRedeemTransaction(feeRate);
//May need to find solution in the fulfillment transaction
Services.BlockExplorerService.Track(offerRedeem.PreviousScriptPubKey);
Tracker.AddressCreated(cycle.Start, TransactionType.ClientOfferRedeem, SolverClientSession.GetInternalState().RedeemDestination, correlation);
Services.TrustedBroadcastService.Broadcast(cycle.Start, TransactionType.ClientOfferRedeem, correlation, offerRedeem);
try
{
solutionKeys = alice.FulfillOffer(SolverClientSession.Id, offerSignature);
SolverClientSession.CheckSolutions(solutionKeys);
var tumblingSolution = SolverClientSession.GetSolution();
var transaction = PromiseClientSession.GetSignedTransaction(tumblingSolution);
Logs.Client.LogInformation("Got puzzle solution cooperatively from the tumbler");
Services.TrustedBroadcastService.Broadcast(cycle.Start, TransactionType.TumblerCashout, correlation, new TrustedBroadcastRequest()
{
BroadcastAt = cycle.GetPeriods().ClientCashout.Start,
Transaction = transaction
});
if (Cooperative)
{
var signature = SolverClientSession.SignEscape();
alice.GiveEscapeKey(SolverClientSession.Id, signature);
Logs.Client.LogInformation("Gave escape signature to the tumbler");
}
}
catch (Exception ex)
{
Logs.Client.LogWarning("The tumbler did not gave puzzle solution cooperatively");
Logs.Client.LogWarning(ex.ToString());
}
}
}
}
break;
case CyclePhase.ClientCashoutPhase:
if (SolverClientSession != null)
{
//If the tumbler is uncooperative, he published solutions on the blockchain
if (SolverClientSession.Status == SolverClientStates.WaitingPuzzleSolutions)
{
var transactions = Services.BlockExplorerService.GetTransactions(SolverClientSession.GetInternalState().OfferCoin.ScriptPubKey, false);
if (transactions.Length != 0)
{
SolverClientSession.CheckSolutions(transactions.Select(t => t.Transaction).ToArray());
Logs.Client.LogInformation("Puzzle solution recovered from tumbler's fulfill transaction");
var tumblingSolution = SolverClientSession.GetSolution();
var transaction = PromiseClientSession.GetSignedTransaction(tumblingSolution);
Tracker.TransactionCreated(cycle.Start, TransactionType.TumblerCashout, transaction.GetHash(), correlation);
Services.BroadcastService.Broadcast(transaction);
}
}
}
break;
}
}
finally
{
if (alice != null && bob != null)
{
throw new InvalidOperationException("Bob and Alice have been both initialized, please report the bug to NTumbleBit developers");
}
if (alice != null)
{
alice.Dispose();
}
if (bob != null)
{
bob.Dispose();
}
}
}
public CycleProgressInfo Update()
{
int height = Services.BlockExplorerService.GetCurrentHeight();
CycleParameters cycle;
CyclePhase phase;
CyclePeriod period;
bool isSafetyPeriod = false;
if (ClientChannelNegotiation == null)
{
cycle = Parameters.CycleGenerator.GetRegisteringCycle(height);
phase = CyclePhase.Registration;
period = cycle.GetPeriods().GetPeriod(phase);
}
else
{
cycle = ClientChannelNegotiation.GetCycle();
var phases = new CyclePhase[]
{
CyclePhase.Registration,
CyclePhase.ClientChannelEstablishment,
CyclePhase.TumblerChannelEstablishment,
CyclePhase.PaymentPhase,
CyclePhase.TumblerCashoutPhase,
CyclePhase.ClientCashoutPhase
};
if (cycle.IsComplete(height))
{
return(null);
}
//If we are not in any phase we are in the SaftyPeriod.
if (!phases.Any(p => cycle.IsInPhase(p, height)))
{
//Find last CyclePhase
phase = CyclePhase.Registration;
for (int i = height - 1; i >= cycle.Start; i--)
{
if (phases.Any(p => cycle.IsInPhase(p, i)))
{
phase = phases.First(p => cycle.IsInPhase(p, i));
break;
}
}
period = cycle.GetPeriods().GetPeriod(phase);
period.End += cycle.SafetyPeriodDuration;
isSafetyPeriod = true;
}
else
{
phase = phases.First(p => cycle.IsInPhase(p, height));
period = cycle.GetPeriods().GetPeriod(phase);
isSafetyPeriod = false;
}
}
var blocksLeft = period.End - height;
Logs.Client.LogInformation($"Cycle {cycle.Start} ({Status})");
Logs.Client.LogInformation($"{cycle.ToString(height)} in phase {phase} ({blocksLeft} more blocks)");
var previousState = Status;
var progressInfo = new CycleProgressInfo(period, height, blocksLeft, cycle.Start, Status, phase, isSafetyPeriod, $"{cycle.ToString(height)} in phase {phase} ({blocksLeft} more blocks)");
TumblerClient bob = null, alice = null;
try
{
var correlation = SolverClientSession == null ? CorrelationId.Zero : new CorrelationId(SolverClientSession.Id);
FeeRate feeRate = null;
switch (phase)
{
case CyclePhase.Registration:
if (Status == PaymentStateMachineStatus.New)
{
bob = Runtime.CreateTumblerClient(cycle.Start, Runtime.TumblerProtocol, Identity.Bob);
//Client asks for voucher
var voucherResponse = bob.AskUnsignedVoucher();
NeedSave = true;
//Client ensures he is in the same cycle as the tumbler (would fail if one tumbler or client's chain isn't sync)
var tumblerCycle = Parameters.CycleGenerator.GetCycle(voucherResponse.CycleStart);
Assert(tumblerCycle.Start == cycle.Start, "invalid-phase");
//Saving the voucher for later
StartCycle = cycle.Start;
ClientChannelNegotiation = new ClientChannelNegotiation(Parameters, cycle.Start);
ClientChannelNegotiation.ReceiveUnsignedVoucher(voucherResponse);
Status = PaymentStateMachineStatus.Registered;
}
break;
case CyclePhase.ClientChannelEstablishment:
if (Status == PaymentStateMachineStatus.Registered)
{
alice = Runtime.CreateTumblerClient(cycle.Start, Runtime.TumblerProtocol, Identity.Alice);
var key = alice.RequestTumblerEscrowKey();
ClientChannelNegotiation.ReceiveTumblerEscrowKey(key.PubKey, key.KeyIndex);
//Client create the escrow
var escrowTxOut = ClientChannelNegotiation.BuildClientEscrowTxOut();
Logs.Client.LogDebug($"Alice ClientChannelEstablishment escrowTxOut.ScriptPubKey: {escrowTxOut.ScriptPubKey.ToHex()}, value: {escrowTxOut.Value})");
feeRate = GetFeeRate();
Logs.Client.LogDebug($"Alice ClientChannelEstablishment feeRate.FeePerK: {feeRate.FeePerK})");
Transaction clientEscrowTx = null;
try
{
clientEscrowTx = Services.WalletService.FundTransactionAsync(escrowTxOut, feeRate).GetAwaiter().GetResult();
}
catch (NotEnoughFundsException ex)
{
Logs.Client.LogInformation($"Not enough funds in the wallet to tumble. Missing about {ex.Missing}. Denomination is {Parameters.Denomination}.");
break;
}
Logs.Client.LogDebug($"Alice ClientChannelEstablishment clientEscrowTx: {clientEscrowTx})");
NeedSave = true;
var redeemDestination = Services.WalletService.GenerateAddressAsync().GetAwaiter().GetResult().ScriptPubKey;
var channelId = new uint160(RandomUtils.GetBytes(20));
SolverClientSession = ClientChannelNegotiation.SetClientSignedTransaction(channelId, clientEscrowTx, redeemDestination);
correlation = new CorrelationId(SolverClientSession.Id);
Tracker.AddressCreated(cycle.Start, TransactionType.ClientEscrow, escrowTxOut.ScriptPubKey, correlation);
Tracker.TransactionCreated(cycle.Start, TransactionType.ClientEscrow, clientEscrowTx.GetHash(), correlation);
Services.BlockExplorerService.TrackAsync(escrowTxOut.ScriptPubKey).GetAwaiter().GetResult();
var redeemTx = SolverClientSession.CreateRedeemTransaction(feeRate);
Logs.Client.LogDebug($"Alice ClientChannelEstablishment redeemTx.Transaction: {redeemTx.Transaction}, redeemTx.BroadcastableHeight: {redeemTx.BroadcastableHeight})");
Tracker.AddressCreated(cycle.Start, TransactionType.ClientRedeem, redeemDestination, correlation);
//redeemTx does not be to be recorded to the tracker, this is TrustedBroadcastService job
Services.BroadcastService.BroadcastAsync(clientEscrowTx).GetAwaiter().GetResult();
Services.TrustedBroadcastService.Broadcast(cycle.Start, TransactionType.ClientRedeem, correlation, redeemTx);
Status = PaymentStateMachineStatus.ClientChannelBroadcasted;
}
else if (Status == PaymentStateMachineStatus.ClientChannelBroadcasted)
{
alice = Runtime.CreateTumblerClient(cycle.Start, Runtime.TumblerProtocol, Identity.Alice);
TransactionInformation clientTx = GetTransactionInformation(SolverClientSession.EscrowedCoin, true);
var state = ClientChannelNegotiation.GetInternalState();
if (clientTx != null && clientTx.Confirmations >= cycle.SafetyPeriodDuration)
{
Logs.Client.LogInformation($"Client escrow reached {cycle.SafetyPeriodDuration} confirmations");
//Client asks the public key of the Tumbler and sends its own
alice.BeginSignVoucher(new SignVoucherRequest
{
MerkleProof = clientTx.MerkleProof,
Transaction = clientTx.Transaction,
KeyReference = state.TumblerEscrowKeyReference,
UnsignedVoucher = state.BlindedVoucher,
Cycle = cycle.Start,
ClientEscrowKey = state.ClientEscrowKey.PubKey,
ChannelId = SolverClientSession.Id
});
NeedSave = true;
Status = PaymentStateMachineStatus.TumblerVoucherSigning;
}
}
else if (Status == PaymentStateMachineStatus.TumblerVoucherSigning)
{
alice = Runtime.CreateTumblerClient(cycle.Start, Runtime.TumblerProtocol, Identity.Alice);
var voucher = alice.EndSignVoucher(SolverClientSession.Id);
if (voucher != null)
{
ClientChannelNegotiation.CheckVoucherSolution(voucher);
NeedSave = true;
Status = PaymentStateMachineStatus.TumblerVoucherObtained;
}
}
break;
case CyclePhase.TumblerChannelEstablishment:
if (Status == PaymentStateMachineStatus.TumblerVoucherObtained)
{
bob = Runtime.CreateTumblerClient(cycle.Start, Runtime.TumblerProtocol, Identity.Bob);
Logs.Client.LogInformation("Begin ask to open the channel...");
//Client asks the Tumbler to make a channel
var bobEscrowInformation = ClientChannelNegotiation.GetOpenChannelRequest();
uint160 channelId = null;
try
{
channelId = bob.BeginOpenChannel(bobEscrowInformation);
NeedSave = true;
}
catch (Exception ex)
{
if (ex.Message.Contains("tumbler-insufficient-funds"))
{
Logs.Client.LogWarning("The tumbler server has not enough funds and can't open a channel for now");
break;
}
throw;
}
ClientChannelNegotiation.SetChannelId(channelId);
Status = PaymentStateMachineStatus.TumblerChannelCreating;
}
else if (Status == PaymentStateMachineStatus.TumblerChannelCreating)
{
bob = Runtime.CreateTumblerClient(cycle.Start, Runtime.TumblerProtocol, Identity.Bob);
var tumblerEscrow = bob.EndOpenChannel(cycle.Start, ClientChannelNegotiation.GetInternalState().ChannelId);
if (tumblerEscrow == null)
{
Logs.Client.LogInformation("Tumbler escrow still creating...");
break;
}
NeedSave = true;
if (tumblerEscrow.OutputIndex >= tumblerEscrow.Transaction.Outputs.Count)
{
Logs.Client.LogError("Tumbler escrow output out-of-bound");
Status = PaymentStateMachineStatus.Wasted;
break;
}
var txOut = tumblerEscrow.Transaction.Outputs[tumblerEscrow.OutputIndex];
var outpoint = new OutPoint(tumblerEscrow.Transaction.GetHash(), tumblerEscrow.OutputIndex);
var escrowCoin = new Coin(outpoint, txOut).ToScriptCoin(ClientChannelNegotiation.GetTumblerEscrowParameters(tumblerEscrow.EscrowInitiatorKey).ToScript());
Logs.Client.LogDebug($"tumblerEscrow.Transaction: {tumblerEscrow.Transaction}");
Logs.Client.LogDebug($"TumblerEscrow hex: {tumblerEscrow.Transaction.ToHex()}");
PromiseClientSession = ClientChannelNegotiation.ReceiveTumblerEscrowedCoin(escrowCoin);
Logs.Client.LogInformation("Tumbler expected escrowed coin received");
//Tell to the block explorer we need to track that address (for checking if it is confirmed in payment phase)
Services.BlockExplorerService.TrackAsync(PromiseClientSession.EscrowedCoin.ScriptPubKey).GetAwaiter().GetResult();
Services.BlockExplorerService.TrackPrunedTransactionAsync(tumblerEscrow.Transaction, tumblerEscrow.MerkleProof).GetAwaiter().GetResult();
Tracker.AddressCreated(cycle.Start, TransactionType.TumblerEscrow, PromiseClientSession.EscrowedCoin.ScriptPubKey, correlation);
Tracker.TransactionCreated(cycle.Start, TransactionType.TumblerEscrow, PromiseClientSession.EscrowedCoin.Outpoint.Hash, correlation);
Services.BroadcastService.BroadcastAsync(tumblerEscrow.Transaction).GetAwaiter().GetResult();
//Channel is done, now need to run the promise protocol to get valid puzzle
var cashoutDestination = DestinationWallet.GetNewDestination();
Tracker.AddressCreated(cycle.Start, TransactionType.TumblerCashout, cashoutDestination, correlation);
feeRate = GetFeeRate();
var sigReq = PromiseClientSession.CreateSignatureRequest(cashoutDestination, feeRate);
var commitments = bob.SignHashes(PromiseClientSession.Id, sigReq);
var revelation = PromiseClientSession.Reveal(commitments);
var proof = bob.CheckRevelation(PromiseClientSession.Id, revelation);
var puzzle = PromiseClientSession.CheckCommitmentProof(proof);
SolverClientSession.AcceptPuzzle(puzzle);
Status = PaymentStateMachineStatus.TumblerChannelCreated;
}
else if (Status == PaymentStateMachineStatus.TumblerChannelCreated)
{
CheckTumblerChannelSecured(cycle);
}
break;
case CyclePhase.PaymentPhase:
//Could have confirmed during safe period
//Only check for the first block when period start,
//else Tumbler can know deanonymize you based on the timing of first Alice request if the transaction was not confirmed previously
if (Status == PaymentStateMachineStatus.TumblerChannelCreated && height == period.Start)
{
CheckTumblerChannelSecured(cycle);
}
//No "else if" intended
if (Status == PaymentStateMachineStatus.TumblerChannelSecured)
{
alice = Runtime.CreateTumblerClient(cycle.Start, Runtime.TumblerProtocol, Identity.Alice);
Logs.Client.LogDebug("Starting the puzzle solver protocol...");
var puzzles = SolverClientSession.GeneratePuzzles();
alice.BeginSolvePuzzles(SolverClientSession.Id, puzzles);
NeedSave = true;
Status = PaymentStateMachineStatus.ProcessingPayment;
}
else if (Status == PaymentStateMachineStatus.ProcessingPayment)
{
feeRate = GetFeeRate();
alice = Runtime.CreateTumblerClient(cycle.Start, Runtime.TumblerProtocol, Identity.Alice);
var commitments = alice.EndSolvePuzzles(SolverClientSession.Id);
NeedSave = true;
if (commitments == null)
{
Logs.Client.LogDebug("Still solving puzzles...");
break;
}
bool isRegtest = Runtime.Network.Name == Network.RegTest.Name;
int connectionCount = Services.BlockExplorerService.GetConnectionCount();
if (connectionCount < 4 && !isRegtest)
{
Logs.Client.LogWarning("There are too few bitcoin peers connected; payment will not be processed");
break;
}
var revelation2 = SolverClientSession.Reveal(commitments);
var solutionKeys = alice.CheckRevelation(SolverClientSession.Id, revelation2);
var blindFactors = SolverClientSession.GetBlindFactors(solutionKeys);
var offerInformation = alice.CheckBlindFactors(SolverClientSession.Id, blindFactors);
var offerSignature = SolverClientSession.SignOffer(offerInformation);
var offerRedeem = SolverClientSession.CreateOfferRedeemTransaction(feeRate);
Logs.Client.LogDebug("Puzzle solver protocol ended...");
Logs.Client.LogDebug($"offerRedeem.Transaction: {offerRedeem.Transaction} at height {offerRedeem.BroadcastableHeight}");
//May need to find solution in the fulfillment transaction
Services.BlockExplorerService.TrackAsync(offerRedeem.PreviousScriptPubKey).GetAwaiter().GetResult();
Tracker.AddressCreated(cycle.Start, TransactionType.ClientOfferRedeem, SolverClientSession.GetInternalState().RedeemDestination, correlation);
Services.TrustedBroadcastService.Broadcast(cycle.Start, TransactionType.ClientOfferRedeem, correlation, offerRedeem);
try
{
solutionKeys = alice.FulfillOffer(SolverClientSession.Id, offerSignature);
SolverClientSession.CheckSolutions(solutionKeys);
var tumblingSolution = SolverClientSession.GetSolution();
var transaction = PromiseClientSession.GetSignedTransaction(tumblingSolution);
Logs.Client.LogDebug("Got puzzle solution cooperatively from the tumbler");
Logs.Client.LogDebug($"TumblerCashOut 1: {transaction}");
Logs.Client.LogDebug($"TumblerCashOut hex 1: {transaction.ToHex()}");
Status = PaymentStateMachineStatus.PuzzleSolutionObtained;
Services.TrustedBroadcastService.Broadcast(cycle.Start, TransactionType.TumblerCashout, correlation, new TrustedBroadcastRequest()
{
BroadcastAt = cycle.GetPeriods().ClientCashout.Start,
Transaction = transaction
});
if (Cooperative)
{
try
{
// No need to await for it, it is a just nice for the tumbler (we don't want the underlying socks connection cut before the escape key is sent)
var signature = SolverClientSession.SignEscape();
alice.GiveEscapeKeyAsync(SolverClientSession.Id, signature).GetAwaiter().GetResult();
}
catch (Exception ex) { Logs.Client.LogDebug(new EventId(), ex, "Exception while giving the escape key"); }
Logs.Client.LogInformation("Gave escape signature to the tumbler");
}
}
catch (Exception ex)
{
Status = PaymentStateMachineStatus.UncooperativeTumbler;
Logs.Client.LogWarning("The tumbler did not gave puzzle solution cooperatively");
Logs.Client.LogWarning(ex.ToString());
}
}
break;
case CyclePhase.ClientCashoutPhase:
//If the tumbler is uncooperative, he published solutions on the blockchain
if (Status == PaymentStateMachineStatus.UncooperativeTumbler)
{
var transactions = Services.BlockExplorerService.GetTransactionsAsync(SolverClientSession.GetInternalState().OfferCoin.ScriptPubKey, false).GetAwaiter().GetResult();
if (transactions.Count != 0)
{
SolverClientSession.CheckSolutions(transactions.Select(t => t.Transaction).ToArray());
Logs.Client.LogInformation("Puzzle solution recovered from tumbler's fulfill transaction");
NeedSave = true;
Status = PaymentStateMachineStatus.PuzzleSolutionObtained;
var tumblingSolution = SolverClientSession.GetSolution();
var transaction = PromiseClientSession.GetSignedTransaction(tumblingSolution);
Logs.Client.LogDebug($"TumblerCashOut 2: {transaction}");
Logs.Client.LogDebug($"TumblerCashOut hex 2: {transaction.ToHex()}");
Tracker.TransactionCreated(cycle.Start, TransactionType.TumblerCashout, transaction.GetHash(), correlation);
Services.BroadcastService.BroadcastAsync(transaction).GetAwaiter().GetResult();
}
}
break;
}
}
catch (InvalidStateException ex)
{
Logs.Client.LogDebug(new EventId(), ex, "Client side Invalid State, the payment is wasted");
Status = PaymentStateMachineStatus.Wasted;
}
catch (Exception ex) when(ex.Message.IndexOf("invalid-state", StringComparison.OrdinalIgnoreCase) >= 0)
{
Logs.Client.LogDebug(new EventId(), ex, "Tumbler side Invalid State, the payment is wasted");
Status = PaymentStateMachineStatus.Wasted;
}
finally
{
if (previousState != Status)
{
Logs.Client.LogInformation($"Status changed {previousState} => {Status}");
}
if (alice != null && bob != null)
{
throw new InvalidOperationException("Bob and Alice have been both initialized, please report the bug to NTumbleBit developers");
}
if (alice != null)
{
alice.Dispose();
}
if (bob != null)
{
bob.Dispose();
}
}
progressInfo.ShouldStayConnected = ShouldStayConnected();
return(progressInfo);
}