/// <inheritdoc/>
public async Task <FeeProposalPayload> MultiSigMemberProposedInteropFeeAsync(string requestId, ulong feeAmount, PubKey pubKey)
{
using (await this.asyncLockObject.LockAsync().ConfigureAwait(false))
{
// If this node does not have the fee proposal, return and wait for the matured blocks sync manager to find and create it.
InteropConversionRequestFee interopConversionRequestFee = GetInteropConversionRequestFeeLocked(requestId);
if (interopConversionRequestFee == null)
{
return(null);
}
// Check if the incoming proposal has not yet concluded and that the node has not yet proposed it.
if (!HasFeeProposalBeenConcluded(interopConversionRequestFee) && !interopConversionRequestFee.FeeProposals.Any(p => p.PubKey == pubKey.ToHex()))
{
// Check that the fee proposal is in range.
if (!IsFeeWithinAcceptableRange(interopConversionRequestFee.FeeProposals, requestId, feeAmount, pubKey))
{
return(null);
}
interopConversionRequestFee.FeeProposals.Add(new InterOpFeeToMultisig()
{
BlockHeight = interopConversionRequestFee.BlockHeight, PubKey = pubKey.ToHex(), FeeAmount = feeAmount
});
this.interopRequestKeyValueStore.SaveValueJson(interopConversionRequestFee.RequestId, interopConversionRequestFee, true);
this.logger.LogDebug($"Received conversion request proposal '{requestId}' from '{pubKey}', proposing fee of {new Money(feeAmount)}.");
}
// This node would have proposed this fee if the InteropConversionRequestFee object exists.
InterOpFeeToMultisig myProposal = interopConversionRequestFee.FeeProposals.First(p => p.PubKey == this.federationManager.CurrentFederationKey.PubKey.ToHex());
string signature = this.federationManager.CurrentFederationKey.SignMessage(interopConversionRequestFee.RequestId + myProposal.FeeAmount);
return(FeeProposalPayload.Reply(interopConversionRequestFee.RequestId, myProposal.FeeAmount, interopConversionRequestFee.BlockHeight, signature));
}
}
private void ConcludeInteropConversionRequestFee(InteropConversionRequestFee interopConversionRequestFee)
{
if (interopConversionRequestFee.State != InteropFeeState.AgreeanceInProgress)
{
return;
}
foreach (InterOpFeeToMultisig vote in interopConversionRequestFee.FeeVotes)
{
this.logger.LogDebug($"Pubkey '{vote.PubKey}' voted for {new Money(vote.FeeAmount)}.");
}
// Try and find the majority vote
IEnumerable <IGrouping <decimal, decimal> > grouped = interopConversionRequestFee.FeeVotes.Select(v => Math.Truncate(Money.Satoshis(v.FeeAmount).ToDecimal(MoneyUnit.BTC))).GroupBy(s => s);
IGrouping <decimal, decimal> majority = grouped.OrderByDescending(g => g.Count()).First();
if (majority.Count() >= (this.federatedPegSettings.MultiSigM / 2) + 1)
{
interopConversionRequestFee.Amount = Money.Coins(majority.Key);
}
else
{
interopConversionRequestFee.Amount = FallBackFee;
}
interopConversionRequestFee.State = InteropFeeState.AgreeanceConcluded;
this.interopRequestKeyValueStore.SaveValueJson(interopConversionRequestFee.RequestId, interopConversionRequestFee, true);
this.logger.LogDebug($"Voting on fee for request id '{interopConversionRequestFee.RequestId}' has concluded, amount: {new Money(interopConversionRequestFee.Amount)}");
}
/// <inheritdoc/>
public async Task <FeeAgreePayload> MultiSigMemberAgreedOnInteropFeeAsync(string requestId, ulong feeAmount, PubKey pubKey)
{
using (await this.asyncLockObject.LockAsync().ConfigureAwait(false))
{
// If this node does not have this conversion request fee, return and wait for the matured blocks sync manager to find it.
InteropConversionRequestFee interopConversionRequestFee = GetInteropConversionRequestFeeLocked(requestId);
if (interopConversionRequestFee == null || (interopConversionRequestFee != null && interopConversionRequestFee.State == InteropFeeState.ProposalInProgress))
{
return(null);
}
// Check if the vote is still in progress and that the incoming node still has to vote on this fee.
if (!HasFeeVoteBeenConcluded(interopConversionRequestFee) && !interopConversionRequestFee.FeeVotes.Any(p => p.PubKey == pubKey.ToHex()))
{
interopConversionRequestFee.FeeVotes.Add(new InterOpFeeToMultisig()
{
BlockHeight = interopConversionRequestFee.BlockHeight, PubKey = pubKey.ToHex(), FeeAmount = feeAmount
});
this.interopRequestKeyValueStore.SaveValueJson(interopConversionRequestFee.RequestId, interopConversionRequestFee, true);
this.logger.LogDebug($"Received conversion request fee vote '{requestId}' from '{pubKey} for a fee of {new Money(feeAmount)}.");
}
// This node would have voted on this if the InteropConversionRequestFee object exists.
InterOpFeeToMultisig myVote = interopConversionRequestFee.FeeVotes.FirstOrDefault(p => p.PubKey == this.federationManager.CurrentFederationKey.PubKey.ToHex());
if (myVote == null)
{
return(null);
}
string signature = this.federationManager.CurrentFederationKey.SignMessage(interopConversionRequestFee.RequestId + myVote.FeeAmount);
return(FeeAgreePayload.Reply(interopConversionRequestFee.RequestId, myVote.FeeAmount, interopConversionRequestFee.BlockHeight, signature));
}
}
/// <inheritdoc/>
public async Task <InteropConversionRequestFee> AgreeFeeForConversionRequestAsync(string requestId, int blockHeight)
{
// First check if this request is older than max-reorg and if so, ignore.
// TODO: Find away to ignore old requests...
InteropConversionRequestFee interopConversionRequestFee = null;
DateTime lastConversionRequestSync = this.dateTimeProvider.GetUtcNow();
DateTime conversionRequestSyncStart = this.dateTimeProvider.GetUtcNow();
do
{
if (conversionRequestSyncStart.AddMinutes(2) <= this.dateTimeProvider.GetUtcNow())
{
this.logger.LogWarning($"A fee for conversion request '{requestId}' failed to reach consensus after 2 minutes, ignoring.");
interopConversionRequestFee.State = InteropFeeState.FailRevertToFallback;
this.interopRequestKeyValueStore.SaveValueJson(requestId, interopConversionRequestFee);
break;
}
if (this.nodeLifetime.ApplicationStopping.IsCancellationRequested)
{
break;
}
// Execute a small delay to not flood the network with proposal requests.
if (lastConversionRequestSync.AddMilliseconds(500) > this.dateTimeProvider.GetUtcNow())
{
continue;
}
using (await this.asyncLockObject.LockAsync().ConfigureAwait(false))
{
interopConversionRequestFee = CreateInteropConversionRequestFeeLocked(requestId, blockHeight);
// If the fee proposal has not concluded then continue until it has.
if (interopConversionRequestFee.State == InteropFeeState.ProposalInProgress)
{
await SubmitProposalForInteropFeeForConversionRequestLockedAsync(interopConversionRequestFee).ConfigureAwait(false);
}
if (interopConversionRequestFee.State == InteropFeeState.AgreeanceInProgress)
{
await AgreeOnInteropFeeForConversionRequestLockedAsync(interopConversionRequestFee).ConfigureAwait(false);
}
if (interopConversionRequestFee.State == InteropFeeState.AgreeanceConcluded)
{
break;
}
}
lastConversionRequestSync = this.dateTimeProvider.GetUtcNow();
} while (true);
return(interopConversionRequestFee);
}
private InteropConversionRequestFee GetInteropConversionRequestFeeLocked(string requestId)
{
InteropConversionRequestFee interopConversionRequest = null;
byte[] proposalBytes = this.interopRequestKeyValueStore.LoadBytes(requestId);
if (proposalBytes != null)
{
string json = Encoding.ASCII.GetString(proposalBytes);
interopConversionRequest = Serializer.ToObject <InteropConversionRequestFee>(json);
}
return(interopConversionRequest);
}
private InteropConversionRequestFee CreateInteropConversionRequestFeeLocked(string requestId, int blockHeight)
{
InteropConversionRequestFee interopConversionRequest = GetInteropConversionRequestFeeLocked(requestId);
if (interopConversionRequest == null)
{
interopConversionRequest = new InteropConversionRequestFee()
{
RequestId = requestId, BlockHeight = blockHeight, State = InteropFeeState.ProposalInProgress
};
this.interopRequestKeyValueStore.SaveValueJson(requestId, interopConversionRequest);
this.logger.LogDebug($"InteropConversionRequestFee object for request '{requestId}' has been created.");
}
return(interopConversionRequest);
}
/// <summary>
/// Submits this node's fee vote. This methods must be called from within <see cref="asyncLockObject"/>.
/// </summary>
/// <param name="interopConversionRequestFee">The request we are currently processing.</param>
/// <returns>The awaited task.</returns>
private async Task AgreeOnInteropFeeForConversionRequestLockedAsync(InteropConversionRequestFee interopConversionRequestFee)
{
if (!HasFeeProposalBeenConcluded(interopConversionRequestFee))
{
this.logger.LogError($"Cannot vote on fee proposal for request id '{interopConversionRequestFee.RequestId}' as it hasn't concluded yet.");
return;
}
// Check if this node has already vote on this fee.
if (!interopConversionRequestFee.FeeVotes.Any(p => p.PubKey == this.federationManager.CurrentFederationKey.PubKey.ToHex()))
{
ulong candidateFee = (ulong)interopConversionRequestFee.FeeProposals.Select(s => Convert.ToInt64(s.FeeAmount)).Average();
var interOpFeeToMultisig = new InterOpFeeToMultisig()
{
BlockHeight = interopConversionRequestFee.BlockHeight, PubKey = this.federationManager.CurrentFederationKey.PubKey.ToHex(), FeeAmount = candidateFee
};
interopConversionRequestFee.FeeVotes.Add(interOpFeeToMultisig);
this.interopRequestKeyValueStore.SaveValueJson(interopConversionRequestFee.RequestId, interopConversionRequestFee, true);
this.logger.LogDebug($"Creating fee vote for conversion request id '{interopConversionRequestFee.RequestId}' with a fee amount of {new Money(candidateFee)}.");
}
this.logger.LogDebug($"{interopConversionRequestFee.FeeVotes.Count} node(s) has voted on a fee for conversion request id '{interopConversionRequestFee.RequestId}'.");
if (HasFeeVoteBeenConcluded(interopConversionRequestFee))
{
ConcludeInteropConversionRequestFee(interopConversionRequestFee);
}
// Broadcast this peer's vote to the federation
InterOpFeeToMultisig myVote = interopConversionRequestFee.FeeVotes.First(p => p.PubKey == this.federationManager.CurrentFederationKey.PubKey.ToHex());
string signature = this.federationManager.CurrentFederationKey.SignMessage(interopConversionRequestFee.RequestId + myVote.FeeAmount);
await this.federatedPegBroadcaster.BroadcastAsync(FeeAgreePayload.Request(interopConversionRequestFee.RequestId, myVote.FeeAmount, interopConversionRequestFee.BlockHeight, signature)).ConfigureAwait(false);
}
private bool HasFeeVoteBeenConcluded(InteropConversionRequestFee interopConversionRequestFee)
{
return(interopConversionRequestFee.FeeVotes.Count >= this.federatedPegSettings.MultiSigM);
}
/// <summary>
/// Submits this node's fee proposal. This methods must be called from within <see cref="asyncLockObject"/>.
/// </summary>
/// <param name="interopConversionRequestFee">The request we are currently processing.</param>
/// <returns>The awaited task.</returns>
private async Task SubmitProposalForInteropFeeForConversionRequestLockedAsync(InteropConversionRequestFee interopConversionRequestFee)
{
// Check if this node has already proposed its fee.
if (!interopConversionRequestFee.FeeProposals.Any(p => p.PubKey == this.federationManager.CurrentFederationKey.PubKey.ToHex()))
{
if (!EstimateConversionTransactionFee(out ulong candidateFee))
{
return;
}
interopConversionRequestFee.FeeProposals.Add(new InterOpFeeToMultisig()
{
BlockHeight = interopConversionRequestFee.BlockHeight, PubKey = this.federationManager.CurrentFederationKey.PubKey.ToHex(), FeeAmount = candidateFee
});
this.interopRequestKeyValueStore.SaveValueJson(interopConversionRequestFee.RequestId, interopConversionRequestFee, true);
this.logger.LogDebug($"Adding this node's proposal fee of {candidateFee} for conversion request id '{interopConversionRequestFee.RequestId}'.");
}
this.logger.LogDebug($"{interopConversionRequestFee.FeeProposals.Count} node(s) has proposed a fee for conversion request id '{interopConversionRequestFee.RequestId}'.");
if (HasFeeProposalBeenConcluded(interopConversionRequestFee))
{
// Only update the proposal state if it is ProposalInProgress and save it.
if (interopConversionRequestFee.State == InteropFeeState.ProposalInProgress)
{
interopConversionRequestFee.State = InteropFeeState.AgreeanceInProgress;
this.interopRequestKeyValueStore.SaveValueJson(interopConversionRequestFee.RequestId, interopConversionRequestFee, true);
IEnumerable <long> values = interopConversionRequestFee.FeeProposals.Select(s => Convert.ToInt64(s.FeeAmount));
this.logger.LogDebug($"Proposal fee for request id '{interopConversionRequestFee.RequestId}' has concluded, average amount: {values.Average()}");
}
}
InterOpFeeToMultisig myProposal = interopConversionRequestFee.FeeProposals.First(p => p.PubKey == this.federationManager.CurrentFederationKey.PubKey.ToHex());
string signature = this.federationManager.CurrentFederationKey.SignMessage(interopConversionRequestFee.RequestId + myProposal.FeeAmount);
await this.federatedPegBroadcaster.BroadcastAsync(FeeProposalPayload.Request(interopConversionRequestFee.RequestId, myProposal.FeeAmount, interopConversionRequestFee.BlockHeight, signature)).ConfigureAwait(false);
}