chore: improve error handling in production env

Antoine Goutenoir
1 parent 9c034dd2
Showing 2 changed files with 43 additions and 34 deletions Show diff stats
flaskr/controllers/main_controller.py
flaskr/models.py
@@ -254,7 +254,6 @@ def estimate():  # register new estimation request, more accurately
             public_id=estimation.public_id,
             extension='html'
         ))
-        # return render_template("estimate-debrief.html", form=form)
  
     return show_form()
  
@@ -720,9 +719,6 @@ def compute():  # process the queue of estimation requests
         return _respond(errmsg)
  
  
-unavailable_statuses = [StatusEnum.pending, StatusEnum.working]
-
-
 @main.route("/estimation/<public_id>.<extension>")
 def consult_estimation(public_id, extension):
     try:
@@ -741,13 +737,16 @@ def consult_estimation(public_id, extension):
  
     if extension in ['xhtml', 'html', 'htm']:
  
-        if estimation.status in unavailable_statuses:
+        if estimation.status in estimation.unavailable_statuses:
             return render_template(
                 "estimation-queue-wait.html",
                 estimation=estimation
             )
         else:
-            estimation_output = estimation.get_output_dict()
+            try:
+                estimation_output = estimation.get_output_dict()
+            except Exception as e:
+                return abort(404)
             estimation_sum = 0
             if estimation_output:
                 for city in estimation_output['cities']:
@@ -762,16 +761,16 @@ def consult_estimation(public_id, extension):
  
     elif extension in ['yaml', 'yml']:
  
-        if estimation.status in unavailable_statuses:
-            abort(404)
+        if not estimation.is_available():
+            return abort(404)
  
         return u"%s" % yaml_dump(estimation.get_output_dict())
         # return estimation.output_yaml
  
     elif 'csv' == extension:
  
-        if estimation.status in unavailable_statuses:
-            abort(404)
+        if not estimation.is_available():
+            return abort(404)
  
         si = StringIO()
         cw = csv.writer(si, quoting=csv.QUOTE_ALL)
@@ -811,7 +810,7 @@ def consult_estimation(public_id, extension):
         )
  
     else:
-        abort(404)
+        return abort(404)
  
  
 def get_locations(addresses):
@@ -877,8 +876,8 @@ def get_trips_csv(public_id, destination_index=0):
     except Exception as e:
         return abort(500)
  
-    if estimation.status in unavailable_statuses:
-        abort(404)
+    if not estimation.is_available():
+        return abort(404)
  
     si = StringIO()
     cw = csv.writer(si, quoting=csv.QUOTE_ALL)
@@ -891,12 +890,12 @@ def get_trips_csv(public_id, destination_index=0):
     results = estimation.get_output_dict()
  
     if not 'cities' in results:
-        abort(500)
+        return abort(500)
  
     cities_length = len(results['cities'])
  
     if 0 == cities_length:
-        abort(500, Response("No cities in results."))
+        return abort(500, Response("No cities in results."))
  
     destination_index = min(destination_index, cities_length - 1)
     destination_index = max(destination_index, 0)
@@ -42,6 +42,8 @@ class Estimation(db.Model):
         default=lambda: generate_unique_id(),
         unique=True
     )
+
+    unavailable_statuses = [StatusEnum.pending, StatusEnum.working]
     status = db.Column(db.Enum(StatusEnum), default=StatusEnum.pending)
  
     email = db.Column(db.Unicode(1024))
@@ -121,8 +123,6 @@ class Estimation(db.Model):
         return join(runs_dir, self.public_id)
  
     def set_output_dict(self, output):
-        # with shelve.open(filename=self.get_output_filename(), protocol=2) as shelf:
-        #     shelf['output'] = output
         shelf = shelve.open(
             filename=self.get_output_filename(),
             flag='c',  # read/write, create if needed
@@ -139,21 +139,25 @@ class Estimation(db.Model):
                 output_filename = self.get_output_filename()
                 if isfile(output_filename):
  
-                    # Perhaps we'll need a mutex around here
-                    # from threading import Lock
-                    # mutex = Lock()
-                    # mutex.acquire()
-
-                    # Not using the `with …` syntax, but we may in python3
-                    shelf = shelve.open(
-                        filename=output_filename,
-                        flag='r',
-                        protocol=2
-                    )
-                    self._output_dict = shelf['output']
-                    shelf.close()
-
-                    # mutex.release()
+                    try:
+                        # Perhaps we'll need a mutex around here
+                        # from threading import Lock
+                        # mutex = Lock()
+                        # mutex.acquire()
+
+                        # Not using the `with …` syntax, but we may in python3
+                        shelf = shelve.open(
+                            filename=output_filename,
+                            flag='r',
+                            protocol=2
+                        )
+                        self._output_dict = shelf['output']
+                        shelf.close()
+
+                        # mutex.release()
+                    except Exception as e:
+
+                        return None
                 else:
                     self._output_dict = None
             else:
@@ -176,10 +180,16 @@ class Estimation(db.Model):
  
     def get_models(self):
         if self._models is None:
-            mdl_slugs = self.models_slugs.split("\n")
-            self._models = [m for m in models if m.slug in mdl_slugs]
+            slugs = self.models_slugs.split("\n")
+            self._models = [m for m in models if m.slug in slugs]
         return self._models
  
+    def is_available(self):
+        if self.status in self.unavailable_statuses:
+            return False
+        # We might add more conditions here, such as file data availability
+        return True
+
  
 # BACKOFFICE CONFIGURATION ####################################################