public async Task <Unit> Handle(DepositCommand request, CancellationToken cancellationToken = default)
{
cancellationToken.ThrowIfCancellationRequested();
var userId = request.UserId;
var balance = request.Balance;
var currency = request.Currency;
var user = await GetUserAsync(userId, cancellationToken);
if (user == null)
{
throw new UserNotFoundException(nameof(UserEntity), userId);
}
var wallet = await GetWalletAsync(userId, currency, cancellationToken);
if (wallet == null)
{
var entity = new WalletEntity(balance, currency, user);
await AddWalletAsync(entity, cancellationToken);
return(Unit.Value);
}
wallet.AddBalance(balance);
await _dbContext.SaveChangesAsync(cancellationToken);
return(Unit.Value);
}
public async Task <Unit> Handle(WithdrawCommand request, CancellationToken cancellationToken = default)
{
cancellationToken.ThrowIfCancellationRequested();
var userId = request.UserId;
var withdraw = request.Withdraw;
var currency = request.Currency;
var userExists = await UserAnyAsync(userId, cancellationToken);
if (!userExists)
{
throw new UserNotFoundException(nameof(UserEntity), userId);
}
var wallet = await GetWalletAsync(userId, currency, cancellationToken);
if (wallet == null)
{
throw new WalletNotFoundException(nameof(WalletEntity), $"{nameof(currency)}: {currency}");
}
if (wallet.Balance < withdraw)
{
throw new BalanceNotEnoughException();
}
wallet.SubtractBalance(withdraw);
await _dbContext.SaveChangesAsync(cancellationToken);
return(Unit.Value);
}
public async Task <BalanceDto> Handle(ConvertCommand request, CancellationToken cancellationToken = default)
{
cancellationToken.ThrowIfCancellationRequested();
var userId = request.UserId;
var fromCurrency = request.FromCurrency;
var toCurrency = request.ToCurrency;
var userExists = await UserAnyAsync(userId, cancellationToken);
if (!userExists)
{
throw new UserNotFoundException(nameof(UserEntity), userId);
}
var wallet = await GetWalletAsync(userId, fromCurrency, cancellationToken);
if (wallet == null)
{
throw new WalletNotFoundException(nameof(WalletEntity), $"{nameof(fromCurrency)}: {fromCurrency}");
}
var envelope = await _ecuEuropa.GetEnvelope();
var fromRate = envelope.GetRate(x => (int)x.Currency == (int)fromCurrency);
var toRate = envelope.GetRate(x => (int)x.Currency == (int)toCurrency);
var balance = wallet.Balance;
// [converted amount] = [balance] * [rate(1)] / [rate(2)]
var amount = balance * toRate / fromRate;
wallet.SetBalance(amount);
wallet.SetCurrency(toCurrency);
await _dbContext.SaveChangesAsync(cancellationToken);
return(new BalanceDto
{
Balance = amount,
Currency = toCurrency
});
}
public void AddBlock(Block block)
{
entities.Blocks.Add(block);
entities.SaveChangesAsync();
}