public static EventWaitHandleAccessRule CurrentUserFullControlRule()
{
var currentUser = UserUtilities.CurrentUserName();
return(new EventWaitHandleAccessRule(
currentUser,
EventWaitHandleRights.FullControl,
AccessControlType.Allow));
}
public static EventWaitHandleAccessRule PublicSynchronizeAccessRule()
{
var currentUser = UserUtilities.CurrentUserName();
return(new EventWaitHandleAccessRule(
new SecurityIdentifier(WellKnownSidType.WorldSid, null),
EventWaitHandleRights.Synchronize,
AccessControlType.Allow));
}
/// <summary>
/// Check if the service is running.
/// </summary>
public static bool EnsureRunning(Context context, string scenario, int waitMs)
{
var currentUser = UserUtilities.CurrentUserName();
#if !PLATFORM_OSX
context.TraceMessage(Severity.Debug, $"Opening ready event name=[{scenario}] for user=[{currentUser}] waitMs={waitMs}.");
var stopwatch = Stopwatch.StartNew();
bool running = ensureRunningCore();
if (running)
{
context.TraceMessage(Severity.Debug, $"Opened ready event name=[{scenario}] by {stopwatch.ElapsedMilliseconds}ms.");
}
return(running);
bool ensureRunningCore()
{
try
{
if (!IpcUtilities.TryOpenExistingReadyWaitHandle(scenario, out EventWaitHandle readyEvent, waitMs))
{
context.TraceMessage(Severity.Debug, "Ready event does not exist");
return(false);
}
using (readyEvent)
{
var waitMsRemaining = Math.Max(0, waitMs - (int)stopwatch.ElapsedMilliseconds);
if (!readyEvent.WaitOne(waitMsRemaining))
{
context.TraceMessage(Severity.Debug, "Ready event was opened but remained unset until timeout");
return(false);
}
return(true);
}
}
catch (UnauthorizedAccessException)
{
context.TraceMessage(Severity.Debug, "Ready event exists, but user does not have acceptable security access");
}
return(false);
}
#else
context.TraceMessage(Severity.Debug, $"Not validating ready event (OSX) name=[{scenario}] for user=[{currentUser}] waitMs={waitMs}");
return(true);
#endif
}
private static EventWaitHandle CreateShutdownEvent(ILogger logger, string scenario)
{
var currentUser = UserUtilities.CurrentUserName();
logger.Debug($"Creating shutdown event name=[{scenario}] for user=[{currentUser}]");
var shutdownEvent = IpcUtilities.GetShutdownWaitHandle(scenario);
if (shutdownEvent.WaitOne(0))
{
shutdownEvent.Dispose();
throw new CacheException($"Shutdown event name=[{scenario}] already exists");
}
return(shutdownEvent);
}
private static EventWaitHandle CreateReadyEvent(ILogger logger, string scenario)
{
var currentUser = UserUtilities.CurrentUserName();
logger.Debug($"Creating ready event name=[{scenario}] for user=[{currentUser}]");
var readyEvent = IpcUtilities.GetReadyWaitHandle(scenario);
if (readyEvent.WaitOne(0))
{
readyEvent.Dispose();
throw new CacheException("A service is already running");
}
return(readyEvent);
}
/// <summary>
/// Attempt to open event that will signal an imminent service shutdown or restart.
/// </summary>
public static EventWaitHandle OpenShutdownEvent(Context context, string scenario)
{
var currentUser = UserUtilities.CurrentUserName();
context.TraceMessage(Severity.Debug, $"Opening shutdown event name=[{scenario}] for user=[{currentUser}]");
EventWaitHandle handle = null;
try
{
if (!IpcUtilities.TryOpenExistingShutdownWaitHandle(scenario, out handle))
{
context.TraceMessage(Severity.Debug, "Shutdown event does not exist");
}
}
catch (UnauthorizedAccessException)
{
context.TraceMessage(Severity.Debug, "Shutdown event exists, but user does not have acceptable security access");
}
return(handle);
}
