public async Task AddTransaction(Transaction transaction)
{
if (transaction == null)
{
throw new ArgumentNullException(nameof(transaction));
}
if (_unverifiedTransactionPool.ContainsKey(transaction.Hash))
{
throw new InvalidTransactionException($"The transaction \"{transaction.Hash.ToString(true)}\" was already queued and still not verified to be added.");
}
if (_verifiedTransactionPool.Contains(transaction.Hash))
{
throw new InvalidTransactionException($"The transaction \"{transaction.Hash.ToString(true)}\" was already queued and verified to be added.");
}
if (await _repository.GetTransaction(transaction.Hash) != null)
{
throw new InvalidTransactionException($"The transaction \"{transaction.Hash.ToString(true)}\" exists already on the blockchain.");
}
if (!_unverifiedTransactionPool.TryAdd(transaction.Hash, transaction))
{
throw new InvalidTransactionException($"The transaction \"{transaction.Hash.ToString(true)}\" was already queued to be added.");
}
}