public void StartService()
{
if (ServiceStarted)
{
return;
}
ServiceStarted = true;
MDNS.Start();
SD.ServiceInstanceDiscovered += (s, e) => MDNS.SendQuery(e.ServiceInstanceName, type: DnsType.SRV);
MDNS.AnswerReceived += (s, e) =>
{
var servers = e.Message.Answers.OfType <SRVRecord>();
foreach (var server in servers)
{
var target = server.Target.ToString();
var name = string.Join(".", server.Name.Labels.TakeLast(3));
lock (_dictLock)
{
if (TargetDictionary.ContainsKey(target))
{
if (!TargetDictionary[target].Contains(name))
{
TargetDictionary[target].Add(name);
}
}
else
{
TargetDictionary.Add(target, new HashSet <string> {
name
});
}
}
Logger.LogInformation($"Receive service record: {name} = {target}");
MDNS.SendQuery(server.Target, type: DnsType.A);
}
var addresses = e.Message.Answers.OfType <AddressRecord>();
foreach (var address in addresses)
{
if (!DomainNameDictionary.TryAdd(address.Name.ToString(), address.Address))
{
DomainNameDictionary[address.Name.ToString()] = address.Address;
}
Logger.LogInformation($"Receive address record: {address.Name} = {address.Address}");
if (TargetDictionary.ContainsKey(address.Name.ToString()))
{
TargetDictionary[address.Name.ToString()]
.Where(t => EventDictionary.ContainsKey(t))
.Foreach(t => EventDictionary[t].Invoke(this, new IPAddressEventArgs(address.Address)));
}
}
};
Logger.LogInformation("Service discovery started");
}
public EventProxy <IPAddressEventArgs> DiscoverService(string serviceName)
{
MDNS.SendQuery(serviceName, type: DnsType.PTR);
lock (_dictLock)
{
EventDictionary.TryAdd(serviceName, new EventProxy <IPAddressEventArgs>());
}
return(EventDictionary[serviceName]);
}