some degree of connection loss resistance

fw-local/database.py

@@ -35,7 +35,12 @@ def storeToString(self):
   def softUpdate(self):
     self.callback(0) #display the progress bar
     # ask the API how many items should there be and how many are there per page
-    first_request = self.api.getNumOf(self.itemtype)
+    try:
+      # in case there are network problems
+      first_request = self.api.getNumOf(self.itemtype)
+    except self.api.ConnectionError:
+      self.callback(-1)
+      return None
     if first_request is None:
       #this will happen if the user fails to log in
       return None

fw-local/filmweb.py

@@ -18,19 +18,23 @@ def getUserPage(username):
     def getUserMoviePage(username, page=1):
       userpage = FilmwebAPI.Constants.getUserPage(username)
       return userpage + '/films?page=' + str(page)
+  ConnectionError = requests_html.requests.ConnectionError
 
   @staticmethod
   def login(username, password):
     session = requests_html.HTMLSession()
-    log = session.post(
-      FilmwebAPI.Constants.login_path,
-      data={'j_username': username, 'j_password': password}
-    )
+    try:
+      log = session.post(
+        FilmwebAPI.Constants.login_path,
+        data={'j_username': username, 'j_password': password}
+      )
+    except FilmwebAPI.ConnectionError:
+      return (False, True) # login error, connection error
     if FilmwebAPI.Constants.auth_error in log.text:
       print('BŁĄD LOGOWANIA')
-      return None
+      return (False, False)
     else:
-      return session
+      return (True, session)
 
   #@staticmethod -- but not actually a static method, see:
   # https://stackoverflow.com/q/21382801/6919631
@@ -152,10 +156,14 @@ def getMoviesPage(self, page=1):
 
   def __fetchPage(self, url):
     #fetch the page and return its parsed representation
-    page = self.session.get(url)
+    try:
+      page = self.session.get(url)
+    except:
+      raise ConnectionError
     if not page.ok:
       status = page.status_code
-      #we should probably do something about this
+      print("FETCH ERROR {}".format(status))
+      raise ConnectionError
     else:
       return BS(page.html.html, 'lxml')
 

fw-local/gui.py

@@ -16,6 +16,8 @@ class Login(object):
   # the API. That function blocks until user enters data and clicks to log in.
   # It then calls API again to do the actual backend login stuff.
   default_message = 'Zaloguj się do filmweb.pl'
+  logerr_message = 'Niepowodzenie logowania!'
+  conerr_message = 'Sprawdź połączenie z internetem!'
 
   def __init__(self, root):
     self.__construct()
@@ -83,8 +85,9 @@ def centerWindow(self):
     self.window.geometry('+{:.0f}+{:.0f}'.format(x, y))
 
   #CALLBACKS
-  def _setStateBad(self, event=None):
-    self.infoLabel['text'] = 'Niepowodzenie logowania!'
+  def _setStateBad(self, event=None, connection=False):
+    message = self.conerr_message if connection else self.logerr_message
+    self.infoLabel['text'] = message
     self.stateGood = False
   def _setStateGood(self, event=None):
     if not self.stateGood:
@@ -99,9 +102,10 @@ def _loginClick(self):
     password = self.passwordEntry.get()
     self.passwordEntry.delete(0, tk.END)  #always clear the password field
     #attempt to log in
-    session = FilmwebAPI.login(username, password)
-    if session is None:
-      self._setStateBad()
+    success, session = FilmwebAPI.login(username, password)
+    if not success:
+      # in this case, "session" is actually a connection error flag
+      self._setStateBad(connection=session)
     else:
       #clear&hide, store session/username and pass control back to the caller
       self.usernameEntry.delete(0, tk.END)

fw-local/posterman.py

@@ -24,7 +24,10 @@ def makePosterPath(self, pid:int):
     return os.path.join(self.CACHE_DIR, '{}.png'.format(pid))
   def downloadPoster(self, url:str, path:str):
     # downloads from url, stores under path
-    response = self.session.get(url)
+    try:
+      response = self.session.get(url)
+    except:
+      return False
     if not response.ok:
       return False
     with open(path, 'wb') as ifile: