private static async Task <IKeyValueStore> TryGetEtcdKeyValueStore()
{
foreach (var kvsAgent in KnownAgents.Get(WellKnownAgentType.KeyValueStore))
{
IKeyValueStore keyValueStore = await EtcdKeyValueStore.TryConnectAsync(kvsAgent);
if (keyValueStore != null)
{
return(keyValueStore);
}
}
// Do not just try the default address - Etcd might be running with a different purpose
return(null);
}
private async Task <ServiceRegistry> CreateServiceRegistryAsync()
{
Stopwatch watch = Stopwatch.StartNew();
IKeyValueStore keyValueStore = await TryGetEtcdKeyValueStore();
List <AgentConfiguration> serviceAgents = new List <AgentConfiguration>();
if (keyValueStore != null)
{
_logger.LogInformation("Connected to distributed key-value store in {millis}ms",
watch.ElapsedMilliseconds);
}
else
{
_logger.LogWarning(
"Unable to connect to distributed key-value store. Using Worker agents from configuration:");
keyValueStore = new LocalKeyValueStore();
_keyValueStoreIsLocal = true;
serviceAgents.AddRange(KnownAgents.Get(WellKnownAgentType.Worker));
}
ServiceRegistry serviceRegistry = new ServiceRegistry(keyValueStore, string.Empty);
AddServices(serviceRegistry, serviceAgents);
int endpointCount = serviceRegistry.GetTotalEndpointCount(out var serviceCount);
_logger.LogInformation(
"Service registry contains {serviceCount} service type(s) at {endpointCount} " +
"different endpoints.", serviceCount, endpointCount);
return(serviceRegistry);
}