static async Task <int> Main(string[] args)
{
IOperator basicOperator = null;
// Setup logging
using var loggerFactory = SetupLogging(args);
var logger = loggerFactory.CreateLogger <Program>();
try
{
logger.LogDebug($"Environment variables: {JsonConvert.SerializeObject(Environment.GetEnvironmentVariables())}");
// Setup termination handlers
SetupSignalHandlers();
// Setup the Kubernetes client
using var client = SetupClient(args);
// Setup the operator
var configuration = GetOperatorConfiguration();
basicOperator = new Operator(configuration, client, loggerFactory);
basicOperator.AddControllerOfType <MyResourceController>();
// Start the operator
return(await basicOperator.StartAsync());
}
catch (Exception exception)
{
logger.LogError(exception, "Operator error");
return(1);
}
IKubernetes SetupClient(string[] args)
{
// Load the Kubernetes configuration
KubernetesClientConfiguration config = null;
if (KubernetesClientConfiguration.IsInCluster())
{
logger.LogDebug("Loading cluster configuration");
config = KubernetesClientConfiguration.InClusterConfig();
}
else
{
logger.LogDebug("Loading local configuration");
config = KubernetesClientConfiguration.BuildConfigFromConfigFile();
}
if (logger.IsEnabled(LogLevel.Debug))
{
logger.LogDebug($"Client configuration: {JsonConvert.SerializeObject(config)}");
}
return(new Kubernetes(config));
}
ILoggerFactory SetupLogging(string[] args)
{
if (!System.Enum.TryParse <LogLevel>(Environment.GetEnvironmentVariable("LOG_LEVEL"), true, out LogLevel logLevel))
{
logLevel = LogLevel.Debug;
}
var loggerFactory = LoggerFactory.Create(builder => builder
.AddConsole(options => options.Format = ConsoleLoggerFormat.Systemd)
.SetMinimumLevel(logLevel)
);
// Enable Kubernetes client logging if level = DEBUG
ServiceClientTracing.IsEnabled = logLevel <= LogLevel.Debug;
ServiceClientTracing.AddTracingInterceptor(new ConsoleTracingInterceptor());
return(loggerFactory);
}
void SetupSignalHandlers()
{
// SIGTERM: signal the operator to shut down gracefully
AppDomain.CurrentDomain.ProcessExit += (s, e) =>
{
logger.LogDebug("Received SIGTERM");
basicOperator?.Stop();
};
// SIGINT: try to shut down gracefully on the first attempt
Console.CancelKeyPress += (s, e) =>
{
bool isFirstSignal = !basicOperator.IsDisposing;
logger.LogDebug($"Received SIGINT, first signal: {isFirstSignal}");
if (isFirstSignal)
{
e.Cancel = true;
Environment.Exit(0);
}
};
}
}
