private async Task Handle(StartSpecialLiquidationInternalCommand command, IEventPublisher publisher)
{
if (!_marginTradingSettings.SpecialLiquidation.Enabled)
{
publisher.PublishEvent(new SpecialLiquidationFailedEvent
{
OperationId = command.OperationId,
CreationTime = _dateService.Now(),
Reason = "Special liquidation is disabled in settings",
});
return;
}
//validate the list of positions contain only the same instrument
var positions = _ordersCache.GetPositions().Where(x => command.PositionIds.Contains(x.Id)).ToList();
if (!string.IsNullOrEmpty(command.AccountId))
{
if (_accountsCacheService.TryGet(command.AccountId) == null)
{
publisher.PublishEvent(new SpecialLiquidationFailedEvent
{
OperationId = command.OperationId,
CreationTime = _dateService.Now(),
Reason = $"Account {command.AccountId} does not exist",
});
return;
}
positions = positions.Where(x => x.AccountId == command.AccountId).ToList();
}
if (positions.Select(x => x.AssetPairId).Distinct().Count() > 1)
{
publisher.PublishEvent(new SpecialLiquidationFailedEvent
{
OperationId = command.OperationId,
CreationTime = _dateService.Now(),
Reason = "The list of positions is of different instruments",
});
return;
}
// excluding positions which have already been used for Special Liquidation
var alreadyUsedPositionIds = (await _operationExecutionInfoRepository
.FilterPositionsInSpecialLiquidationAsync(positions.Select(p => p.Id))
).ToList();
if (alreadyUsedPositionIds.Any())
{
await _log.WriteWarningAsync(
nameof(StartSpecialLiquidationInternalCommand),
nameof(SpecialLiquidationCommandsHandler),
$"Position(s) {string.Join(", ", alreadyUsedPositionIds)} will be excluded since they are already in Special Liquidation process or the process was successfully finished.");
positions = positions.Where(p => !alreadyUsedPositionIds.Contains(p.Id)).ToList();
}
if (!positions.Any())
{
publisher.PublishEvent(new SpecialLiquidationFailedEvent
{
OperationId = command.OperationId,
CreationTime = _dateService.Now(),
Reason = "No positions to liquidate",
});
return;
}
if (!TryGetExchangeNameFromPositions(positions, out var externalProviderId))
{
publisher.PublishEvent(new SpecialLiquidationFailedEvent
{
OperationId = command.OperationId,
CreationTime = _dateService.Now(),
Reason = "All requested positions must be open on the same external exchange",
});
return;
}
var assetPairId = positions.First().AssetPairId;
if (_assetPairsCache.GetAssetPairById(assetPairId).IsDiscontinued)
{
publisher.PublishEvent(new SpecialLiquidationFailedEvent
{
OperationId = command.OperationId,
CreationTime = _dateService.Now(),
Reason = $"Asset pair {assetPairId} is discontinued",
});
return;
}
var(executionInfo, _) = await _operationExecutionInfoRepository.GetOrAddAsync(
operationName : SpecialLiquidationSaga.OperationName,
operationId : command.OperationId,
factory : () => new OperationExecutionInfo <SpecialLiquidationOperationData>(
operationName: SpecialLiquidationSaga.OperationName,
id: command.OperationId,
lastModified: _dateService.Now(),
data: new SpecialLiquidationOperationData
{
State = SpecialLiquidationOperationState.Initiated,
Instrument = assetPairId,
PositionIds = positions.Select(x => x.Id).ToList(),
ExternalProviderId = externalProviderId,
AccountId = command.AccountId,
CausationOperationId = command.CausationOperationId,
AdditionalInfo = command.AdditionalInfo,
OriginatorType = command.OriginatorType
}
));
if (executionInfo.Data.SwitchState(SpecialLiquidationOperationState.Initiated, SpecialLiquidationOperationState.Started))
{
publisher.PublishEvent(new SpecialLiquidationStartedInternalEvent
{
OperationId = command.OperationId,
CreationTime = _dateService.Now(),
Instrument = positions.FirstOrDefault()?.AssetPairId,
});
_chaosKitty.Meow(command.OperationId);
await _operationExecutionInfoRepository.Save(executionInfo);
}
}
