async Task HandleRequest(IConn conn)
{
using (conn) {
var req = await conn.Read(5.Sec());
try {
_env.Debug($"{req}");
await _env.SimulateWork(35.Ms());
switch (req)
{
case AddItemRequest r:
await AddItem(conn, r);
break;
case MoveItemRequest r:
await MoveItem(conn, r);
break;
case CountRequest r:
var amount = _store.Count();
await conn.Write(new CountResponse(amount));
break;
}
} catch (Exception ex) {
_env.Error($"Error while processing {req}", ex);
}
}
}
async Task MoveItem(IConn conn, MoveItemRequest moveItemRequest)
{
var wasFrom = _store.GetItemQuantity(moveItemRequest.FromItemID);
var wasTo = _store.GetItemQuantity(moveItemRequest.ToItemID);
if (wasFrom < moveItemRequest.Amount)
{
await conn.Write(new ArgumentException("Insufficient amount"));
return;
}
await Commit(
new ItemAdded(moveItemRequest.ToItemID, moveItemRequest.Amount, wasTo + moveItemRequest.Amount),
new ItemRemoved(moveItemRequest.FromItemID, moveItemRequest.Amount, wasFrom - moveItemRequest.Amount));
await conn.Write(new MoveItemResponse());
}
async Task AddItem(IConn conn, AddItemRequest addItemRequest)
{
var quantity = _store.GetItemQuantity(addItemRequest.ItemID);
var total = quantity + addItemRequest.Amount;
var evt = new ItemAdded(addItemRequest.ItemID, addItemRequest.Amount, total);
await Commit(evt);
await conn.Write(new AddItemResponse(addItemRequest.ItemID, addItemRequest.Amount, total));
}
async Task HandleAsync(IConn conn)
{
try {
using (conn) {
var req = await conn.Read(5.Sec());
switch (req)
{
case DownloadRequest dr:
await conn.Write(_stored.Skip((int)dr.From).Take(dr.Count).ToList());
return;
case CommitRequest cr:
await _env.SimulateWork(5.Ms());
foreach (var e in cr.Events)
{
_buffer.Enqueue(e);
}
ScheduleStore();
await conn.Write("OK");
return;
default:
conn.Write($"Unknown request {req}");
return;
}
}
} catch (Exception ex) {
_env.Debug($"Error: {ex.Message}");
}
}