private async Task <IKeyValueStore> InitializeKeyValueStoreAsync(
[NotNull] IEnumerable <IManagedProcess> managedProcesses,
[NotNull] ClusterHeartBeat heartbeat)
{
string etcdAgentType = WellKnownAgentType.KeyValueStore.ToString();
IEnumerable <IManagedProcess> kvsProcesses =
managedProcesses.Where(m => m.AgentType.Equals(etcdAgentType));
// For all well-known KVS agent processes...
foreach (var kvsProcess in kvsProcesses)
{
// Check if they live (reviving them, if necessary):
bool started = await heartbeat.CheckHeartBeatAsync(kvsProcess);
if (started)
{
// ... and try making contact
IServerProcess serverProcess = (IServerProcess)kvsProcess;
var keyValueStore = await EtcdKeyValueStore.TryConnectAsync(
serverProcess.HostName, serverProcess.Port, serverProcess.UseTls);
if (keyValueStore != null)
{
_logger.LogInformation("Using etcd based key-value store...");
return(keyValueStore);
}
}
}
// None is configured or none is running or none is responding:
_logger.LogInformation("Using in-memory key-value store...");
return(new LocalKeyValueStore());
}
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);
}