public void RemoveExpiredRecords()
{
foreach (KeyValuePair <DnsResourceRecordType, IReadOnlyList <DnsResourceRecord> > entry in _entries)
{
if (DnsResourceRecord.IsRRSetStale(entry.Value))
{
_entries.TryRemove(entry.Key, out _); //RR Set is expired; remove entry
}
}
}
public void SetRecords(DnsResourceRecordType type, IReadOnlyList <DnsResourceRecord> records)
{
if ((records.Count > 0) && (records[0].RDATA is DnsSpecialCacheRecord splRecord) && splRecord.IsFailure)
{
//call trying to cache failure record
if (_entries.TryGetValue(type, out IReadOnlyList <DnsResourceRecord> existingRecords))
{
if ((existingRecords.Count > 0) && !(existingRecords[0].RDATA is DnsSpecialCacheRecord existingSplRecord && existingSplRecord.IsFailure) && !DnsResourceRecord.IsRRSetStale(existingRecords))
{
return; //skip to avoid overwriting a useful record with a failure record
}
}
}
_entries[type] = records;
}