private bool reinitialize()
{
// If we are already initialized and the settings file hasn’t changed, we don’t need to do anything.
var firstRunEver = _server == null;
if (_server != null && File.GetLastWriteTimeUtc(_settingsPath) <= _settingsLastChangedTime)
{
return(false);
}
// This may load *and re-write* the settings file...
var newSettings = PropellerUtil.LoadSettings(_settingsPath, firstRunEver ? new ConsoleLogger() : _log, firstRunEver);
// ... so remember the file date/time stamp *after* the writing
_settingsLastChangedTime = File.GetLastWriteTimeUtc(_settingsPath);
_log = PropellerUtil.GetLogger(true, newSettings.LogFile, newSettings.LogVerbosity);
_log.Info(firstRunEver ? "Initializing Propeller" : "Reinitializing Propeller");
// If either port number or the bind-to address have changed, stop and restart the server’s listener.
var startListening = false;
if (_server == null || CurrentSettings == null ||
!CurrentSettings.ServerOptions.Endpoints.Values.SequenceEqual(newSettings.ServerOptions.Endpoints.Values))
{
var removed = CurrentSettings == null ? new HttpEndpoint[0] : CurrentSettings.ServerOptions.Endpoints.Values.Except(newSettings.ServerOptions.Endpoints.Values).ToArray();
var added = CurrentSettings == null?newSettings.ServerOptions.Endpoints.Values.ToArray() : newSettings.ServerOptions.Endpoints.Values.Except(CurrentSettings.ServerOptions.Endpoints.Values).ToArray();
if (_server == null || removed.Length > 0 || added.Length > 0)
{
if (removed.Length > 0)
{
_log.Info("Disabling {0}".Fmt(removed.Select(ep => "HTTP{0} on port {1}".Fmt(ep.Secure ? "S" : null, ep.Port)).JoinString(", ", lastSeparator: " and ")));
}
if (added.Length > 0)
{
_log.Info("Enabling {0}".Fmt(added.Select(ep => "HTTP{0} on port {1}".Fmt(ep.Secure ? "S" : null, ep.Port)).JoinString(", ", lastSeparator: " and ")));
}
if (_server == null)
{
_server = new HttpServer
{
Options = newSettings.ServerOptions,
ErrorHandler = errorHandler,
ResponseExceptionHandler = responseExceptionHandler
}
}
;
else
{
_server.StopListening();
}
startListening = true;
}
}
CurrentSettings = newSettings;
// Create a new instance of all the modules
var newAppDomains = new HashSet <AppDomainInfo>();
foreach (var module in newSettings.Modules)
{
_log.Info("Initializing module: " + module.ModuleName);
try
{
var inf = new AppDomainInfo(_log, newSettings, module, new SettingsSaver(s =>
{
module.Settings = s;
_settingsSavedByModule = true;
}));
newAppDomains.Add(inf);
}
catch (Exception e)
{
_log.Error("Failed to initialize module {0}:".Fmt(module.ModuleName));
_log.Exception(e);
}
}
// Switcheroo!
lock (_lockObject)
{
_log.Info("AppDomain Switcheroo");
_inactiveAppDomains.AddRange(_activeAppDomains);
_activeAppDomains = newAppDomains;
_server.Options = newSettings.ServerOptions;
_server.Handler = createResolver().Handle;
_server.Log = PropellerUtil.GetLogger(newSettings.HttpAccessLogToConsole, newSettings.HttpAccessLogFile, newSettings.HttpAccessLogVerbosity);
if (startListening)
{
_server.StartListening();
}
}
// Delete any remaining temp folders no longer in use
HashSet <string> tempFoldersInUse;
lock (_lockObject)
tempFoldersInUse = _activeAppDomains.Concat(_inactiveAppDomains).Select(ad => ad.TempPathUsed).ToHashSet();
foreach (var tempFolder in Directory.EnumerateDirectories(CurrentSettings.TempFolder ?? Path.GetTempPath(), "propeller-tmp-*"))
{
if (tempFoldersInUse.Contains(tempFolder))
{
continue;
}
try { Directory.Delete(tempFolder, recursive: true); }
catch { }
}
return(true);
}
private void checkSettingsChanges()
{
try
{
// ① If the server settings have changed, reinitialize everything.
if (reinitialize())
{
return;
}
// ② If a module rewrote its settings, save the settings file.
if (_settingsSavedByModule)
{
_log.Debug("A module saved the settings.");
try
{
lock (_lockObject)
CurrentSettings.Save(_settingsPath);
}
catch (Exception e)
{
_log.Error("Error saving Propeller settings:");
PropellerUtil.LogException(_log, e);
}
_settingsSavedByModule = false;
_settingsLastChangedTime = File.GetLastWriteTimeUtc(_settingsPath);
}
// ③ If any module wants to reinitialize, do it
AppDomainInfo[] actives;
lock (_lockObject)
actives = _activeAppDomains.ToArray();
foreach (var active in actives)
{
if (!active.MustReinitialize) // this adds a log message if it returns true
{
continue;
}
_log.Info("Module says it must reinitialize: {0} ({1})".Fmt(active.ModuleSettings.ModuleName, active.GetHashCode()));
var newAppDomain = new AppDomainInfo(_log, CurrentSettings, active.ModuleSettings, active.Saver);
lock (_lockObject)
{
_inactiveAppDomains.Add(active);
_activeAppDomains.Remove(active);
_activeAppDomains.Add(newAppDomain);
_server.Handler = createResolver().Handle;
_log.Info(" --- {0} replaced with {1}, {0} shutting down".Fmt(active.GetHashCode(), newAppDomain.GetHashCode()));
active.RunnerProxy.Shutdown();
}
}
// ④ Try to clean up as many inactive AppDomains as possible
AppDomainInfo[] inactives;
lock (_lockObject)
inactives = _inactiveAppDomains.ToArray();
foreach (var inactive in inactives)
{
// Ask the runner if it has active connections; if this throws, it’s in a broken state anyway, so unload it by force.
bool disposeAllowed;
try { disposeAllowed = inactive.HasActiveConnections; }
catch { disposeAllowed = true; }
if (disposeAllowed)
{
_log.Info("Disposing inactive module: {0} ({1})".Fmt(inactive.ModuleSettings.ModuleName, inactive.GetHashCode()));
lock (_lockObject)
_inactiveAppDomains.Remove(inactive);
try { inactive.Dispose(); }
catch { }
}
else
{
_log.Info("Inactive module still has active connections: {0} ({1})".Fmt(inactive.ModuleSettings.ModuleName, inactive.GetHashCode()));
}
}
}
catch (Exception e)
{
PropellerUtil.LogException(_log, e);
}
}
