// Run a query and wait for the predicate to be satisfied.
// Return the list of resources which satisfied the predicate or null if canceled before the predicate was satisfied.
public static IEnumerable <IDiscoveryResource> QueryAndWaitForResourcesPredicate(
IDiscoveryAgent svc, string type,
Func <IEnumerable <IDiscoveryResource>, bool> pred, CancellationToken token)
{
using (var discovery = svc.Subscribe(type))
{
return(QueryAndWaitForResourcesPredicate(discovery, pred, token));
}
}
private void SendAndReceive(IDiscoveryAgent agent)
{
// Do simple operations to verify that sending and receiving packets doesn't fail.
using (var cts = new CancellationTokenSource(Utils.TestTimeoutMs))
{
var _ = agent.PublishAsync("Test", "http://resource1", null, cts.Token).Result;
}
using (var task = agent.Subscribe("Category")) { }
}
/// <summary>
/// Factory method for creating a DiscoveryTransport. The Discovery Transport wraps the
/// given ICompositeTransport and will add and remove Transport URIs as they are discovered.
/// </summary>
public static DiscoveryTransport CreateTransport(ICompositeTransport compositeTransport, URISupport.CompositeData compositeData, StringDictionary options)
{
DiscoveryTransport transport = new DiscoveryTransport(compositeTransport);
URISupport.SetProperties(transport, options, "transport.");
transport.Properties = options;
Uri discoveryAgentURI = compositeData.Components[0];
IDiscoveryAgent discoveryAgent = DiscoveryAgentFactory.CreateAgent(discoveryAgentURI);
transport.DiscoveryAgent = discoveryAgent;
return(transport);
}
public void Run(string username, IPAddress broadcastAddress)
{
_username = username;
_localAddrString = GetLocalIPAddress().ToString();
_chatServer = new TcpListener(IPAddress.Any, ChatPort);
_chatServer.Start();
Task.Run(ListenForConnections);
// Initialize the discovery agent
_discoveryAgent = new PeerDiscoveryAgent(new UdpPeerDiscoveryTransport(broadcastAddress, DiscoveryPort));
// Publish a resource exposing the local IP address for connections and the user name as an attribute.
var connection = GetLocalIPAddress().ToString();
var attributes = new Dictionary <string, string> {
[NameKey] = username
};
_discoveryAgent.PublishAsync(ParticipantCategory, connection, attributes);
// Subscribe to other participant resources.
_discoverySubscription = _discoveryAgent.Subscribe(ParticipantCategory);
_discoverySubscription.Updated +=
(IDiscoverySubscription subscription) =>
{
// Parse discovered resources.
var activePeers = new Dictionary <IPAddress, string>();
foreach (var res in subscription.Resources)
{
if (res.Connection == _localAddrString)
{
// Exclude the local resource.
continue;
}
try
{
var address = IPAddress.Parse(res.Connection);
var name = res.Attributes[NameKey];
activePeers.Add(address, name);
}
catch (Exception e)
{
// Invalid resource format, or multiple resources per host.
Debug.WriteLine($"Invalid resource: {e}");
continue;
}
}
// Create reader connections to the active peers.
RefreshReaderConnections(activePeers);
};
// Loop waiting for input.
Console.CursorTop = Console.WindowHeight;
Console.Write(Prompt);
while (true)
{
string message = Console.ReadLine();
PostLocalMessageToConsole(message);
PostLocalMessageToPeers(message);
}
}
