/// <summary>
/// Resolves the contact point according to its type. If it is not an IP address, then considers it a hostname and
/// attempts to resolve it with DNS.
/// </summary>
private async Task <IEnumerable <IConnectionEndPoint> > ResolveContactPointAsync(string contactPointText)
{
if (_resolvedContactPoints.TryGetValue(contactPointText, out var ipEndPoints))
{
return(ipEndPoints);
}
if (IPAddress.TryParse(contactPointText, out var ipAddress))
{
var ipEndpoint = new IPEndPoint(ipAddress, _protocolOptions.Port);
var connectionEndPoint = new ConnectionEndPoint(ipEndpoint, GetServerName);
var listOfConnectionEndPoints = new List <IConnectionEndPoint> {
connectionEndPoint
};
_resolvedContactPoints.AddOrUpdate(
contactPointText,
key => listOfConnectionEndPoints,
(key, list) => listOfConnectionEndPoints);
return(listOfConnectionEndPoints);
}
IPHostEntry hostEntry = null;
try
{
hostEntry = await _dns.GetHostEntryAsync(contactPointText).ConfigureAwait(false);
}
catch (Exception)
{
Cluster.Logger.Warning($"Host '{contactPointText}' could not be resolved");
}
var connectionEndPoints = new List <IConnectionEndPoint>();
if (hostEntry != null && hostEntry.AddressList.Length > 0)
{
connectionEndPoints.AddRange(
hostEntry.AddressList.Select(resolvedAddress =>
new ConnectionEndPoint(new IPEndPoint(resolvedAddress, _protocolOptions.Port), GetServerName)));
}
_resolvedContactPoints.AddOrUpdate(
contactPointText,
key => connectionEndPoints,
(key, list) => connectionEndPoints);
return(connectionEndPoints);
}
/// <inheritdoc />
public override Task <IEnumerable <IConnectionEndPoint> > GetOrResolveContactPointAsync(object contactPoint)
{
if (contactPoint is IPEndPoint endpoint)
{
var connectionEndPoint = new ConnectionEndPoint(endpoint, GetServerName);
var listOfConnectionEndPoints = new List <IConnectionEndPoint> {
connectionEndPoint
};
return(Task.FromResult(listOfConnectionEndPoints.AsEnumerable()));
}
if (!(contactPoint is string contactPointText))
{
throw new InvalidOperationException("Contact points should be either string or IPEndPoint instances");
}
return(ResolveContactPointAsync(contactPointText));
}