public async Task <bool> Status()
{
try
{
var request = new StatusRequest();
var response = await _client.StatusASync(request);
return(response != null);
}
catch (Exception e)
{
Console.WriteLine(e);
return(false);
}
}
/// <summary>
/// Optional connection warm-up to speed up initial access.
/// </summary>
public async Task <bool> ConnectAsync()
{
try
{
var statusRequest = new StatusRequest();
StatusResponse response = await _etcdClient.StatusASync(statusRequest);
_logger.LogDebug("Successfully connected to etcd: {response}", response.ToString());
}
catch (Exception e)
{
_logger.LogWarning(e, "Error connecting to etcd using {client}", _etcdClient);
return(false);
}
return(true);
}
/// <summary>
/// Initialise etcd client
/// </summary>
/// <param name="options"></param>
private async Task <EtcdClient> CreateClient(EtcdConfigurationRepositoryOptions options)
{
EtcdClient etcdClient = null;
var lookup = new LookupClient();
if (options.UseEtcdClientDiscovery)
{
var dnsHostName = string.IsNullOrEmpty(options.DnsHostOverride)
? $"_etcd-client${(options.UseTLS ? "-ssl" : "")}.${options.EtcdClientDiscoveryDomain}"
: options.DnsHostOverride;
_logger.LogInformation("Attempting service discovery using hostname {dnsHostName}", dnsHostName);
var dnsResponse = await lookup.QueryAsync(dnsHostName, QueryType.SRV);
if (dnsResponse.Answers.Count > 0)
{
foreach (var srvRecord in dnsResponse.Answers.SrvRecords())
{
_logger.LogInformation($"Connecting to etcd host {srvRecord.Target} using port {options.PortOverride ?? srvRecord.Port}.");
var tmpEtcdClient = new EtcdClient(srvRecord.Target, options.PortOverride ?? srvRecord.Port, options.Username, options.Password);
try
{
await tmpEtcdClient.StatusASync(new Etcdserverpb.StatusRequest());
etcdClient = tmpEtcdClient;
break;
}
catch (Exception ex)
{
_logger.LogWarning(ex, "Failed to connect to etcd cluster.");
tmpEtcdClient.Dispose();
}
}
}
if (etcdClient == null)
{
if (!options.UseTLS) //Try again with TLS
{
_logger.LogInformation("Retrying discovery etcd cluster using TLS.");
options.UseTLS = true;
etcdClient = await CreateClient(options);
}
else
{
throw new InvalidOperationException("Unable to connect to a etcd cluster because service discovery operations failed.");
}
}
}
else if (!string.IsNullOrEmpty(options.DnsHostOverride))
{
_logger.LogInformation($"Connecting to etcd host {options.DnsHostOverride} using port {options.PortOverride ?? 2379}.");
etcdClient = new EtcdClient(options.DnsHostOverride, options.PortOverride ?? 2379, options.Username, options.Password);
}
else
{
throw new ArgumentException("Must specify 'DnsHostOverride option' if 'UseEtcdDiscovery' option is set to false.");
}
return(etcdClient);
}
