private async Task ConnectSocketAsync(Uri uri)
{
var innerErrors = new List <Exception>();
var addresses = await _resolver.ResolveAsync(uri.Host).ConfigureAwait(false);
foreach (var address in addresses)
{
try
{
await ConnectSocketAsync(address, uri.Port).ConfigureAwait(false);
return;
}
catch (Exception e)
{
var actualException = e;
if (actualException is AggregateException)
{
actualException = ((AggregateException)actualException).GetBaseException();
}
innerErrors.Add(new IOException(
$"Failed to connect to server '{uri}' via IP address '{address}': {actualException.Message}",
actualException));
}
}
// all failed
throw new IOException(
$"Failed to connect to server '{uri}' via IP addresses'{addresses.ToContentString()}' at port '{uri.Port}'.",
new AggregateException(innerErrors));
}
public Task <IPAddress[]> ResolveAsync(string hostname)
{
if (_getHostByNameMethod != null)
{
return(Task.FromResult(Resolve(hostname)));
}
return(_fallBackResolver.ResolveAsync(hostname));
}
public Task <IPAddress[]> ResolveAsync(string hostname)
{
return(_original.ResolveAsync(_target.Host));
}
