public ProcessWatchdog(
ILogger <ProcessWatchdog> logger,
ITimeService time,
IProcessService process,
IFileSystemService filesystem,
IOptions <ProcessWatchdogOptions> options)
{
_logger = logger;
_time = time;
_process = process;
_filesystem = filesystem;
_options = options.Value ?? throw new ArgumentNullException(nameof(options));
State = ProcessWatchdogStates.Initing;
}
public async Task Step()
{
var path = _options.ProcessInfo.FullPath;
//var processWasRunning = false;
if (State == ProcessWatchdogStates.Initing && !_filesystem.FileExists(path))
{
_logger.LogCritical($"Could not find file '{path}'");
State = ProcessWatchdogStates.FileNotFound;
}
else if (State == ProcessWatchdogStates.FileNotFound)
{
_failCounter++;
await _time.Delay(_options.RestartInterval);
if (_filesystem.FileExists(path))
{
State = ProcessWatchdogStates.Initing;
}
}
else
{
//check if its already running
var processes = GetProcesses();
if (processes.Count == 0)
{
if (State == ProcessWatchdogStates.Running)
{
_failCounter++;
_logger.LogError($"Process unexpectedly quit '{path}'.");
//await _time.Delay(_options.RestartInterval);
State = ProcessWatchdogStates.Initing;
}
else
{
if (State == ProcessWatchdogStates.Starting)
{
_failCounter++;
_logger.LogError($"Failed to start '{path}', trying again.");
//await _time.Delay(_options.RestartInterval);
}
State = ProcessWatchdogStates.Starting;
//needs started
_logger.LogInformation($"Starting process '{path}'");
_process.Run(_options.ProcessInfo);
await _time.Delay(_options.WarmupInterval);
}
}
else if (processes.Count == 1)
{
//already running, monitor
if (State != ProcessWatchdogStates.Running)
{
_logger.LogInformation($"Found instance of '{path}'.");
}
_failCounter = 0;
State = ProcessWatchdogStates.Running;
await _time.Delay(_options.CheckInterval);
}
else
{
if (State != ProcessWatchdogStates.MultipleProcesses)
{
//more than 1 running ?!?!
_logger.LogCritical($"More than one instance of '{path}', waiting for exit.");
//if (!await StopAll())
_failCounter++;
}
State = ProcessWatchdogStates.MultipleProcesses;
await _time.Delay(_options.RestartInterval);
}
}
}
