public Dictionary <Guid, string> GetTraderNames(IEnumerable <Guid> traderIds)
{
var currentUser = GetCurrentTraderInfo();
var ret = new Dictionary <Guid, string>();
foreach (var traderId in traderIds.Distinct())
{
if (Traders.TryGetValue(traderId, out Trader trader))
{
ret.Add(traderId, trader.Name);
}
}
Log.Information("Retrieved {count} trader names for user {UserId}", ret.Count, currentUser.Id);
return(ret);
}
public bool AcceptTrade(Guid offerId)
{
var buyer = GetCurrentTraderInfo();
if (buyer == null)
{
Log.Warning("Failed to accept trade offer {TradeOfferId} for session {SessionId} because no user is logged on", offerId, OperationContext.Current.SessionId);
}
if (!TradeOffers.TryGetValue(offerId, out TradeOffer tradeOffer))
{
Log.Information("Trader {UserId} attempted to accept trade offer {TradeOfferId} but it was not available", buyer.Id, offerId);
return(false);
}
if (!Traders.TryGetValue(tradeOffer.SellerId, out Trader seller))
{
Log.Information("Trader {UserId} attempted to accept trade offer {TradeOfferId} but seller ({UserId}) was not found.", buyer.Id, offerId, tradeOffer.SellerId);
return(false);
}
// Lock the buyer to make sure that they don't make multiple transactions at once, potentially overspending
lock (buyer)
{
if (!TraderHasFunds(buyer, tradeOffer.Asking))
{
Log.Information("Trader {UserId} attempted to accept trade offer {TradeOfferId} but had insufficient funds", buyer.Id, offerId);
return(false);
}
// If all else checks out (buyer funds, seller presence, etc.), attempt to grab the trade offer and remove
// it from availabilty
if (!TradeOffers.TryRemove(offerId, out tradeOffer))
{
Log.Information("Trader {UserId} attempted to accept trade offer {TradeOfferId} but it was not available (2)", buyer.Id, offerId);
return(false);
}
// Transfer beans
RemoveBeans(buyer, tradeOffer.Asking);
}
// Beans can be added without locking. Nested locks for the buyer and seller would cause deadlocks.
AddBeans(buyer, tradeOffer.Offering);
AddBeans(seller, tradeOffer.Asking);
Log.Information("Trader {UserId} has accepted trade offer {TradeOfferId} from seller {UserId}", buyer.Id, offerId, tradeOffer.SellerId);
// Alert traders that the trade has been accepted and is no longer available
var invalidCallbacks = new List <string>();
foreach (var callback in Callbacks)
{
try
{
callback.Value?.TradeAccepted(tradeOffer, buyer.Id);
callback.Value?.RemoveTradeOffer(offerId);
}
catch (CommunicationException)
{
Log.Warning("Session {SessionId}'s channel closed unexpectedly; will remove from callback list", callback.Key);
invalidCallbacks.Add(callback.Key);
}
}
foreach (var id in invalidCallbacks)
{
Callbacks.TryRemove(id, out _);
}
return(true);
}