private async Task <IDnsQueryResponse> QueryAsync(DnsQuestion question, CancellationToken cancellationToken)
{
if (question == null)
{
throw new ArgumentNullException(nameof(question));
}
var head = new DnsRequestHeader(GetNextUniqueId(), Recursion, DnsOpCode.Query);
var request = new DnsRequestMessage(head, question);
var handler = UseTcpOnly ? _tcpFallbackHandler : _messageHandler;
if (_cache.Enabled)
{
var cacheKey = ResponseCache.GetCacheKey(question);
var item = _cache.Get(cacheKey);
if (item == null)
{
item = await ResolveQueryAsync(handler, request, cancellationToken).ConfigureAwait(false);
_cache.Add(cacheKey, item);
}
return(item);
}
else
{
return(await ResolveQueryAsync(handler, request, cancellationToken).ConfigureAwait(false));
}
}
private IDnsQueryResponse Query(DnsQuestion question)
{
if (question == null)
{
throw new ArgumentNullException(nameof(question));
}
var head = new DnsRequestHeader(GetNextUniqueId(), Recursion, DnsOpCode.Query);
var request = new DnsRequestMessage(head, question);
var handler = UseTcpOnly ? _tcpFallbackHandler : _messageHandler;
if (_cache.Enabled)
{
var cacheKey = ResponseCache.GetCacheKey(question);
var item = _cache.Get(cacheKey);
if (item == null)
{
item = ResolveQuery(handler, request);
_cache.Add(cacheKey, item);
}
return(item);
}
else
{
return(ResolveQuery(handler, request));
}
}
public DnsRequestMessage(DnsRequestHeader header, DnsQuestion question)
{
if (header == null)
{
throw new ArgumentNullException(nameof(header));
}
if (question == null)
{
throw new ArgumentNullException(nameof(question));
}
Header = header;
Question = question;
}
public DnsRequestMessage(DnsRequestHeader header, DnsQuestion question, DnsQuerySettings dnsQuerySettings = null)
{
Header = header ?? throw new ArgumentNullException(nameof(header));
Question = question ?? throw new ArgumentNullException(nameof(question));
QuerySettings = dnsQuerySettings ?? new DnsQuerySettings(new DnsQueryOptions());
}
public DnsRequestMessage(DnsRequestHeader header, DnsQuestion question)
{
Header = header ?? throw new ArgumentNullException(nameof(header));
Question = question ?? throw new ArgumentNullException(nameof(question));
}