public static Result <ServiceOfflineDurationTracker> Create(
OperationContext context,
IClock clock,
IAbsFileSystem fileSystem,
int?logIntervalSeconds,
AbsolutePath logFilePath)
{
return(context.PerformOperation(Tracer,
() =>
{
if (logIntervalSeconds == null)
{
return new Result <ServiceOfflineDurationTracker>($"{nameof(ServiceOfflineDurationTracker)} is disabled");
}
var serviceTracker = new ServiceOfflineDurationTracker(context, clock, fileSystem, logIntervalSeconds.Value, logFilePath);
// We can't log current timestamp here, because it will mess up with the following GetOfflineDuration call.
// Instead, the caller of GetOfflineDuration may specify whether to update the file or not.
return new Result <ServiceOfflineDurationTracker>(serviceTracker);
}));
}
public static Result <ServiceOfflineDurationTracker> Create(
OperationContext context,
IClock clock,
IAbsFileSystem fileSystem,
DistributedCacheServiceConfiguration configuration)
{
return(context.PerformOperation(Tracer,
() =>
{
var logIntervalSeconds = configuration.DistributedContentSettings.ServiceRunningLogInSeconds;
if (logIntervalSeconds == null)
{
return new Result <ServiceOfflineDurationTracker>($"{nameof(ServiceOfflineDurationTracker)} is disabled");
}
var logFilePath = configuration.LocalCasSettings.GetCacheRootPathWithScenario(LocalCasServiceSettings.DefaultCacheName) / FileName;
var serviceTracker = new ServiceOfflineDurationTracker(context, clock, fileSystem, logIntervalSeconds.Value, logFilePath);
serviceTracker.LogCurrentTimeStampToFile(context);
return new Result <ServiceOfflineDurationTracker>(serviceTracker);
}));
}
/// <summary>
/// Creates and runs a distributed cache service
/// </summary>
/// <exception cref="CacheException">thrown when cache startup fails</exception>
public static async Task RunAsync(DistributedCacheServiceArguments arguments)
{
// Switching to another thread.
await Task.Yield();
var host = arguments.Host;
var timer = Stopwatch.StartNew();
InitializeGlobalLifetimeManager(host);
// NOTE(jubayard): this is the entry point for running CASaaS. At this point, the Logger inside the
// arguments holds the client's implementation of our logging interface ILogger. Here, we may override the
// client's decision with our own.
// The disposableToken helps ensure that we shutdown properly and all logs are sent to their final
// destination.
var loggerReplacement = CreateReplacementLogger(arguments);
arguments.Logger = loggerReplacement.Logger;
using var disposableToken = loggerReplacement.DisposableToken;
AdjustCopyInfrastructure(arguments);
var context = new Context(arguments.Logger);
await ReportStartingServiceAsync(context, host);
var factory = new CacheServerFactory(arguments);
var operationContext = new OperationContext(context);
ServiceOfflineDurationTracker serviceRunningTracker = null;
// Technically, this method doesn't own the file copier, but no one actually owns it.
// So to clean up the resources (and print some stats) we dispose it here.
using (arguments.Copier as IDisposable)
using (var server = factory.Create())
{
try
{
var startupResult = await server.StartupAsync(context);
if (!startupResult)
{
throw new CacheException(startupResult.ToString());
}
var serviceRunningTrackerResult = ServiceOfflineDurationTracker.Create(
operationContext,
SystemClock.Instance,
new PassThroughFileSystem(),
arguments.Configuration);
ReportServiceStarted(operationContext, host, serviceRunningTrackerResult, timer.Elapsed);
serviceRunningTracker = serviceRunningTrackerResult.GetValueOrDefault();
await arguments.Cancellation.WaitForCancellationAsync();
ReportShuttingDownService(context);
}
catch (Exception e)
{
ReportServiceStartupFailed(context, e, timer.Elapsed);
throw;
}
finally
{
// Writing the current time before shutting the service down.
serviceRunningTracker?.LogCurrentTimeStampToFile(operationContext);
timer.Reset();
var timeoutInMinutes = arguments.Configuration?.DistributedContentSettings?.MaxShutdownDurationInMinutes ?? 30;
var result = await server
.ShutdownAsync(context)
.WithTimeoutAsync("Server shutdown", TimeSpan.FromMinutes(timeoutInMinutes));
serviceRunningTracker?.Dispose();
ReportServiceStopped(context, host, result, timer.Elapsed);
}
}
}
