public Task HandleOneAsync()
{
var evt = new UnitEvent(_identity, Codes.BurningEvent,
UnitEvent.UnitEventData.Create());
return(Claptrap.HandleEventAsync(evt));
}
public async Task CreateOrderAsync(CreateOrderInput input)
{
var orderId = Claptrap.State.Identity.Id;
// throw exception if order already created
if (StateData.OrderCreated)
{
throw new BizException($"order with order id already created : {orderId}");
}
// get items from cart
var cartGrain = _grainFactory.GetGrain <ICartGrain>(input.CartId);
var items = await cartGrain.GetItemsAsync();
// update inventory for each sku
foreach (var(skuId, count) in items)
{
var skuGrain = _grainFactory.GetGrain <ISkuGrain>(skuId);
await skuGrain.UpdateInventoryAsync(-count);
}
// remove all items from cart
await cartGrain.RemoveAllItemsAsync();
// create a order
var evt = this.CreateEvent(new OrderCreatedEvent
{
UserId = input.UserId,
Skus = items
});
await Claptrap.HandleEventAsync(evt);
}
public async Task <int> UpdateInventoryAsync(int diff)
{
if (diff == 0)
{
throw new BizException("diff can`t be 0");
}
var old = StateData.Inventory;
var newInventory = old + diff;
if (newInventory < 0)
{
throw new BizException(
$"failed to update inventory. It will be less than 0 if add diff amount. current : {old} , diff : {diff}");
}
var evt = this.CreateEvent(new InventoryUpdateEvent
{
Diff = diff,
NewInventory = newInventory
});
await Claptrap.HandleEventAsync(evt);
return(StateData.Inventory);
}
public Task UpdateCountAsync(int fromStationId, int toStationId)
{
var stations = StateData.Stations;
var matchFrom = false;
var matchTo = false;
foreach (var station in stations)
{
if (station == fromStationId)
{
matchFrom = true;
}
if (matchFrom && station == toStationId)
{
matchTo = true;
break;
}
}
if (!matchTo)
{
throw new StationNotFoundException(TrainId, fromStationId, toStationId);
}
var evt = this.CreateEvent(new UpdateCountEvent
{
FromStationId = fromStationId,
ToStationId = toStationId
});
return(Claptrap.HandleEventAsync(evt));
}
public async Task MasterEventReceivedAsync(IEnumerable <IEvent> events)
{
foreach (var @event in events)
{
await Claptrap.HandleEventAsync(@event);
}
}
public async Task RunAsync(SagaFlow flow)
{
_ = _activated.Value;
if (StateData.SagaFlowState != null !)
{
if (StateData.SagaFlowState.IsCompleted)
{
_logger.LogInformation("saga flow already completed");
return;
}
}
else
{
_logger.LogInformation("saga flow is not built, start to build it");
var evt = new SagaFlowCreateEvent
{
Steps = flow.Steps,
CompensateSteps = flow.CompensateSteps,
UserData = _sagaUserDataSerializer.Serialize(flow.UserData, flow.UserData.GetType()),
UserDataType = flow.UserData.GetType()
};
await Claptrap.HandleEventAsync(new DataEvent(_identity, SagaCodes.Create, evt));
}
await ContinueAsync();
}
public async Task MasterEventReceivedJsonAsync(IEnumerable <EventJsonModel> events)
{
var items = events.Select(_eventSerializer.Deserialize);
foreach (var @event in items)
{
await Claptrap.HandleEventAsync(@event);
}
}
public async Task <ArticleData> UpdateAsync(ArticleData articleData)
{
var dataEvent = this.CreateEvent(new UpdateArticleEventData
{
ArticleData = articleData
});
await Claptrap.HandleEventAsync(dataEvent);
return(StateData.Current);
}
public Task ChangeBalanceAsync(decimal diff)
{
var evt = new AccountBalanceChangeEvent
{
Diff = diff,
};
return(Claptrap.HandleEventAsync(new DataEvent(Claptrap.State.Identity, Codes.AccountBalanceChangeEvent,
evt)));
}
public Task TransferIn(decimal amount, string uid)
{
var accountBalanceChangeEventData = new AccountBalanceChangeEventData
{
Diff = +amount
};
var dataEvent = this.CreateEvent(accountBalanceChangeEventData);
return(Claptrap.HandleEventAsync(dataEvent));
}
public async Task <Dictionary <string, int> > RemoveItemAsync(string skuId, int count)
{
var evt = this.CreateEvent(new RemoveItemFromCartEvent
{
Count = count,
SkuId = skuId
});
await Claptrap.HandleEventAsync(evt);
return(StateData.Items);
}
public Task RemoveAllItemsAsync()
{
if (StateData.Items?.Any() != true)
{
return(Task.CompletedTask);
}
var removeAllItemsFromCartEvent = new RemoveAllItemsFromCartEvent();
var evt = this.CreateEvent(removeAllItemsFromCartEvent);
return(Claptrap.HandleEventAsync(evt));
}
public async Task <decimal> TransferInAsync(decimal amount)
{
var accountBalanceChangeEventData = new AccountBalanceChangeEventData
{
Diff = +amount
};
var dataEvent = this.CreateEvent(accountBalanceChangeEventData);
await Claptrap.HandleEventAsync(dataEvent);
var re = await GetBalanceAsync();
return(re);
}
public Task TakeSeatAsync(int fromStationId, int toStationId, string requestId)
{
if (!StateData.StationDic.TryGetValue(fromStationId, out var fromIndex))
{
throw CreateNotFoundException();
}
if (!StateData.StationDic.TryGetValue(toStationId, out var toIndex))
{
throw CreateNotFoundException();
}
if (fromIndex >= toIndex)
{
throw CreateNotFoundException();
}
var distance = toIndex - fromIndex;
var notRequested = StateData.RequestIds
.Skip(fromIndex)
.Take(distance)
.All(string.IsNullOrEmpty);
if (!notRequested)
{
throw new SeatHasBeenTakenException(SeatId,
fromStationId,
toStationId);
}
var evt = this.CreateEvent(new TakeSeatEvent
{
RequestId = requestId,
FromStationId = fromStationId,
ToStationId = toStationId
});
return(Claptrap.HandleEventAsync(evt));
StationNotFoundException CreateNotFoundException()
{
var seatId = Main.SeatId.FromSeatId(SeatId);
return(new StationNotFoundException(seatId.TrainId,
fromStationId,
toStationId));
}
}
public Task <TryBiddingResult> TryBidding(TryBiddingInput input)
{
var status = GetStatusCore();
if (status != AuctionItemStatus.OnSell)
{
return(Task.FromResult(CreateResult(false)));
}
if (input.Price <= GetTopPrice())
{
return(Task.FromResult(CreateResult(false)));
}
return(HandleCoreAsync());
async Task <TryBiddingResult> HandleCoreAsync()
{
var dataEvent = this.CreateEvent(new NewBidderEvent
{
Price = input.Price,
UserId = input.UserId
});
await Claptrap.HandleEventAsync(dataEvent);
return(CreateResult(true));
}
TryBiddingResult CreateResult(bool success)
{
return(new()
{
Success = success,
NowPrice = GetTopPrice(),
UserId = input.UserId,
AuctionItemStatus = status
});
}
decimal GetTopPrice()
{
return(StateData.BiddingRecords?.Any() == true
? StateData.BiddingRecords.First().Key
: StateData.BasePrice);
}
}
public async Task <string> LoginAsync(string username, string password)
{
var userInfo = StateData;
var hashPassword = PasswordHelper.HashPassword(userInfo.Secret, password);
if (username != userInfo.Username || hashPassword != userInfo.Password)
{
return(null);
}
var eventData = new UserLoginEvent();
var evt = this.CreateEvent(eventData);
await Claptrap.HandleEventAsync(evt);
var jwt = CreateJwt(UserId, userInfo.Secret);
return(jwt);
}
public Task ChangeBalanceAsync(decimal diff)
{
var accountStateData = (AccountStateData)Claptrap.State.Data;
if (accountStateData.Balance + diff < 0)
{
return(Task.CompletedTask);
}
var dataEvent = new DataEvent(
Claptrap.State.Identity,
ClaptrapCodes.BalanceChangeEvent,
new ChangeAccountBalanceEventData
{
Diff = diff,
NewBalance = accountStateData.Balance + diff,
OldBalance = accountStateData.Balance,
});
return(Claptrap.HandleEventAsync(dataEvent));
}
private async Task <bool> ContinueCoreAsync()
{
var flowState = StateData.SagaFlowState;
if (flowState.IsCompensated)
{
_logger.LogInformation("saga flow IsCompensated = true, please create a new saga flow.");
return(false);
}
if (flowState.IsCompleted)
{
_logger.LogInformation("saga flow IsCompleted = true, please create a new saga flow.");
return(false);
}
if (flowState.IsCompensating)
{
for (var i = 0;
i < flowState.CompensateStepStatuses.Length && i <= flowState.LastErrorStepIndex;
i++)
{
var status = flowState.CompensateStepStatuses[i];
if (status != StepStatus.Completed)
{
await Claptrap.HandleEventAsync(new DataEvent(_identity,
SagaCodes.Compensate,
new SagaCompensateStepEvent
{
StepIndex = i,
}));
return(true);
}
}
}
for (var i = 0; i < flowState.StepStatuses.Length; i++)
{
var status = flowState.StepStatuses[i];
switch (status)
{
case StepStatus.Completed:
continue;
case StepStatus.NotStarted:
await Claptrap.HandleEventAsync(new DataEvent(_identity,
SagaCodes.MoveToNext,
new SagaMoveToNextEvent
{
StepIndex = i,
}));
return(true);
default:
throw new ArgumentOutOfRangeException();
}
}
_logger.LogInformation("saga flow done");
return(false);
}