Fix: Handle broken toolboxes

wxPyphant no longer raises an exception when
loading a broken toolbox or recipe.
Instead an error message is displayed to the user
and wxPyphant starts up allowing for an update.
If the recipe was broken, an empty recipe with an
altered filename is opened to prevent data loss.

src/pyphant/pyphant/wxgui2/wxPyphantApplication.py

@@ -138,10 +138,6 @@ def __init__(self, _wxPyphantApp):
                                     id2=self.ID_WINDOW_BOTTOM)
         #self.Bind(wx.EVT_SIZE, self.onSize)
         self.compositeWorkerStack = []
-        wx.MessageBox("Located log directory at %s.\n"
-                      "Logging will go to %s." %
-                      (LOGDIR, os.path.join(LOGDIR, 'pyphant.log')),
-                      "Logging info")
 
     def _initSash(self):
         self._workerRepository = wx.SashLayoutWindow(
@@ -152,7 +148,23 @@ def _initSash(self):
         #self._workerRepository.SetAlignment(wx.LAYOUT_RIGHT)
         #self._workerRepository.SetSashVisible(wx.SASH_LEFT, True)
         #self._workerRepository.SetExtraBorderSize(10)
-        WorkerRepository.WorkerRepository(self._workerRepository)
+        try:
+            WorkerRepository.WorkerRepository(self._workerRepository)
+        except:
+            import sys
+            self._wxPyphantApp._logger.debug(u"An exception occured while "\
+                                             "loading the toolboxes.",
+                                             exc_info=sys.exc_info())
+            wx.MessageBox("An error has occurred while importing "\
+                          "the toolboxes.\nPlease investigate the logfile "\
+                          "for further details.\nThe logfile is located at %s\n"\
+                          "You may also try to update and restart wxPyphant."\
+                          % os.path.join(LOGDIR, 'pyphant.log'),
+                          "Toolbox Error!")
+            self._workerRepository = wx.SashLayoutWindow(
+                self, self.ID_WINDOW_RIGHT, wx.DefaultPosition,
+                wx.Size(220,1000),
+                wx.NO_BORDER)
 
     def _initAui(self):
         self._auiManager = wx.aui.AuiManager(self)
@@ -182,8 +194,9 @@ def emit(self, record):
             "d:%(module)s.%(funcName)s(l %(lineno)d):%(message)s"))
         logbuffer.setTarget(handler)
         logbuffer.flush()
-        self._auiManager.AddPane(self._logpane, wx.BOTTOM, 'Logfile '\
-                                 '(click into text to update)')
+        self._auiManager.AddPane(self._logpane, wx.BOTTOM, 'Logfile @ %s'\
+                                 ' (click into text to update)' \
+                                 % os.path.join(LOGDIR, 'pyphant.log'))
         self._auiManager.AddPane(self._workerRepository, wx.RIGHT,
                                  'Worker Repository')
         self._auiManager.AddPane(self._remainingSpace, wx.CENTER, 'Main')
@@ -234,27 +247,33 @@ def onOpenCompositeWorker(self, event):
                     self._wxPyphantApp.pathToRecipe = path
             dlg.Destroy()
         import PyphantCanvas
-        try:
-            if self._wxPyphantApp.pathToRecipe[-3:] == '.h5':
-                if os.path.exists(self._wxPyphantApp.pathToRecipe):
+        if self._wxPyphantApp.pathToRecipe[-3:] == '.h5':
+            if os.path.exists(self._wxPyphantApp.pathToRecipe):
+                try:
                     recipe = pyphant.core.PyTablesPersister.loadRecipeFromHDF5File(
                         self._wxPyphantApp.pathToRecipe)
                     self._remainingSpace = PyphantCanvas.PyphantCanvas(self, recipe)
-                else:
+                except:
+                    self._wxPyphantApp._logger.debug(u"An exception occured while "\
+                                       "loading a recipe.",
+                                       exc_info=sys.exc_info())
+                    wx.MessageBox("An error has occurred while opening "\
+                                  "the recipe.\nRecipe has been set to an "\
+                                  "empty file in order to prevent data loss.\n"\
+                                  "Please investigate the logfile "\
+                                  "for further details.\nThe logfile is located at %s"\
+                                  % os.path.join(LOGDIR, 'pyphant.log'),
+                                  "Recipe broken, unknown format or outdated!")
+                    self._wxPyphantApp.pathToRecipe += ".error.h5"
                     self._remainingSpace = PyphantCanvas.PyphantCanvas(self)
-                from pyphant.core.WebInterface import shorten
-                self.SetTitle(self.titleStr \
-                              % shorten(self._wxPyphantApp.pathToRecipe, 30, 30))
             else:
-                raise IOError('Unknown file format in file "%s"'\
+                self._remainingSpace = PyphantCanvas.PyphantCanvas(self)
+            from pyphant.core.WebInterface import shorten
+            self.SetTitle(self.titleStr \
+                          % shorten(self._wxPyphantApp.pathToRecipe, 30, 30))
+        else:
+            raise IOError('Unknown file format in file "%s"'\
                               % self._wxPyphantApp.pathToRecipe)
-        except:
-            wx.MessageBox("An error has occurred while opening "\
-                          "the recipe.\nPlease investigate the logfile "\
-                          "for further details.\nThe logfile is located at %s"\
-                          % os.path.join(LOGDIR, 'pyphant.log'),
-                          "Recipe broken, unknown format or outdated!")
-            raise
         self.recipeState = 'clean'
         self._remainingSpace.diagram.recipe.registerListener(self.recipeChanged)