private static async Task DoResolveAsync(IDnsResolverStrategy dnsResolverStrategy, DnsQuestion dnsQuestion,
IWriteDnsContext dnsWriteContext, CancellationToken cancellationToken)
{
var answer = await dnsResolverStrategy
.ResolveAsync(dnsQuestion, cancellationToken)
.ConfigureAwait(false);
var response = (DnsMessage)dnsWriteContext.Response;
response.AnswerRecords.AddRange(answer.Cast <DnsRecordBase>());
}
private static async Task DoStrategyAsync(IDnsResolverStrategy dnsResolverStrategy, DnsQuestion dnsQuestion,
IWriteDnsContext dnsWriteContext, CancellationToken joinedGlobalCtx)
{
if (!dnsWriteContext.Response.AnswerRecords.Any() && dnsResolverStrategy != null)
{
try
{
if (!dnsResolverStrategy.NeedsQueryTimeout)
{
await DoResolveAsync(dnsResolverStrategy, dnsQuestion, dnsWriteContext, joinedGlobalCtx).ConfigureAwait(false);
}
else
{
using (var strategyQueryTimeoutCts = new CancellationTokenSource(dnsResolverStrategy.Rule.QueryTimeout * 2))
using (var joinedStrategyCts = CancellationTokenSource.CreateLinkedTokenSource(strategyQueryTimeoutCts.Token, joinedGlobalCtx))
{
await DoResolveAsync(dnsResolverStrategy, dnsQuestion, dnsWriteContext, joinedStrategyCts.Token).ConfigureAwait(false);
}
}
}
catch (ArgumentOutOfRangeException aoore)
{
dnsWriteContext.Logger.LogWarning(aoore, "A mapping is not supported [{0}] for that dns question! >> [{1}]",
aoore.ActualValue, aoore.Message);
}
catch (Exception e)
{
dnsWriteContext.Logger.LogError(e, "A strategy error for the dns question {0} with the error message >> [{1}]",
dnsQuestion?.Name?.ToString(), e.Message);
}
}
else
{
dnsWriteContext.Logger.LogInformation("Query is found! {0}", dnsResolverStrategy?.GetType()?.ToString());
}
}
