/// <summary>
/// Recursively gathers all the dependents of the mempool transactions provided.
/// </summary>
/// <param name="transactionHashes">Mempool transactions to gather their dependents.</param>
/// <param name="includingProvided">Should it include in the result the unconfirmed ones from the provided transactionHashes.</param>
/// <param name="likelyProvidedManyConfirmedOnes">If many provided transactionHashes are not confirmed then it optimizes by doing a check in the beginning of which ones are unconfirmed.</param>
/// <returns>All the dependents of the provided transactionHashes.</returns>
public static async Task <ISet <uint256> > GetAllDependentsAsync(this RPCClient rpc, IEnumerable <uint256> transactionHashes, bool includingProvided, bool likelyProvidedManyConfirmedOnes)
{
IEnumerable <uint256> workingTxHashes = likelyProvidedManyConfirmedOnes // If confirmed txIds are provided, then do a big check first.
? await rpc.GetUnconfirmedAsync(transactionHashes)
: transactionHashes;
var hashSet = new HashSet <uint256>();
foreach (var txId in workingTxHashes)
{
// Go through all the txIds provided and getmempoolentry to get the dependents and the confirmation status.
var entry = await rpc.GetMempoolEntryAsync(txId, throwIfNotFound : false);
if (entry != null)
{
// If we asked to include the provided transaction hashes into the result then check which ones are confirmed and do so.
if (includingProvided)
{
hashSet.Add(txId);
}
// Get all the dependents of all the dependents except the ones we already know of.
var except = entry.Depends.Except(hashSet);
var dependentsOfDependents = await rpc.GetAllDependentsAsync(except, includingProvided : true, likelyProvidedManyConfirmedOnes : false);
// Add them to the hashset.
hashSet.UnionWith(dependentsOfDependents);
}
}
return(hashSet);
}
