private async IAsyncEnumerable <string> SearchNode(IDnsClient client, string query, SearchContext searchContext)
{
if (!searchContext.VisitedRefs.Contains(query))
{
searchContext.VisitedRefs.Add(query);
IEnumerable <string> lookupResult = await client.Lookup(query);
foreach (string node in lookupResult)
{
EnrTreeNode treeNode = EnrTreeParser.ParseNode(node);
foreach (string link in treeNode.Links)
{
DnsClient linkedTreeLookup = new(link);
await foreach (string nodeRecordText in SearchTree(linkedTreeLookup, searchContext))
{
yield return(nodeRecordText);
}
}
foreach (string nodeRecordText in treeNode.Records)
{
yield return(nodeRecordText);
}
foreach (string nodeRef in treeNode.Refs)
{
searchContext.RefsToVisit.Enqueue(nodeRef);
}
}
}
}