public LoadBalancingService(IConfiguration configuration)
{
KnownAgents.Configure(configuration);
_loadBalancerConfig = new LoadBalancerConfig();
configuration.GetSection(nameof(LoadBalancerConfig)).Bind(_loadBalancerConfig);
if (string.IsNullOrEmpty(_loadBalancerConfig.HostName))
{
_logger.LogWarning("Invalid configuration: Hostname is null.");
}
}
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 void ConfigureEnvironment(IConfiguration configuration)
{
_logger.LogInformation("Configuring cluster agents...");
KnownAgents.ConfigureAgents(configuration);
if (_clusterConfig == null)
{
_clusterConfig = new ClusterConfig();
}
configuration.GetSection(nameof(ClusterConfig)).Bind(_clusterConfig);
if (_cluster != null)
{
ConfigureClusterAgents();
}
}
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);
}
