Exemple #1
0
        /// <summary>
        /// Supervises your application and if it exits or crashes it will be automatically restarted.
        /// NB! This method _MUST_ be invoked after <see cref="ProcessEvents"/>. You can stop the supervisor
        /// process by invoking <see cref="StopSupervisor"/> before exiting the application.
        /// </summary>
        /// <param name="restartArguments"></param>
        public static bool StartSupervisor(List <string> restartArguments = null)
        {
            StopSupervisor();

            if (!SnapOs.Filesystem.FileExists(SuperVisorProcessExeDirectory))
            {
                Logger.Error($"Unable to find supervisor executable: {SuperVisorProcessExeDirectory}");
                return(false);
            }

            var superVisorId = Current.SuperVisorId;

            var coreRunArgument = $"--corerun-supervise-pid={SnapOs.ProcessManager.Current.Id} --corerun-supervise-id={superVisorId}";

            SuperVisorProcess = SnapOs.ProcessManager.StartNonBlocking(new ProcessStartInfoBuilder(SuperVisorProcessExeDirectory)
                                                                       .AddRange(restartArguments ?? new List <string>())
                                                                       .Add(coreRunArgument)
                                                                       );

            SupervisorProcessRestartArguments = restartArguments ?? new List <string>();

            Logger.Debug($"Enabled supervision of process with id: {SnapOs.ProcessManager.Current.Id}. Supervisor id: {superVisorId}. " +
                         $"Restart arguments({SupervisorProcessRestartArguments.Count}): {string.Join(",", SupervisorProcessRestartArguments)}. ");

            SuperVisorProcess.Refresh();

            return(!SuperVisorProcess.HasExited);
        }
Exemple #2
0
        public static bool StopSupervisor()
        {
            try
            {
                if (SuperVisorProcess == null)
                {
                    return(false);
                }

                SuperVisorProcess.Refresh();
                var supervisorRunning = !SuperVisorProcess.HasExited;
                if (!supervisorRunning)
                {
                    return(false);
                }

                if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                {
                    // ReSharper disable once InconsistentNaming
                    const int SIGTERM = 15;
                    // We have to signal the supervisor so we can release the machine wide semaphore.
                    var killResult  = CoreRunLib.NativeMethodsUnix.kill(SuperVisorProcess.Id, SIGTERM);
                    var killSuccess = killResult == 0;

                    if (!killSuccess)
                    {
                        Logger.Warn($"Failed to signal ({nameof(SIGTERM)}) supervisor. Return code: {killResult}.");
                        return(false);
                    }

                    Logger.Info($"Successfully signaled ({nameof(SIGTERM)}) supervisor.");

                    var attempts = 3;
                    while (attempts-- >= 0)
                    {
                        SuperVisorProcess.Refresh();

                        supervisorRunning = !SuperVisorProcess.HasExited;
                        if (!supervisorRunning)
                        {
                            break;
                        }

                        Thread.Sleep(100);
                    }

                    return(!supervisorRunning);
                }

                SuperVisorProcess.Kill();
                SuperVisorProcess.Refresh();
                supervisorRunning = !SuperVisorProcess.HasExited;

                return(!supervisorRunning);
            }
            catch (Exception e)
            {
                Logger.ErrorException($"Exception thrown when killing supervisor process with pid: {SuperVisorProcess?.Id}", e);
            }
            SuperVisorProcess = null;
            return(false);
        }