some fixes for stuck when alert

ansible/roles/screenly/files/uzbl-config

@@ -1,2 +1,6 @@
 set show_status = 0
-set ssl_verify = 1
+set ssl_verify  = 1
+set on_event    = request ON_EVENT
+
+@on_event   LOAD_START         js alert=function(e){return true};confirm=function(e){return true};prompt=function(e){return true};
+@on_event   LOAD_COMMIT        js alert=function(e){return true};confirm=function(e){return true};prompt=function(e){return true};

viewer.py

@@ -44,6 +44,7 @@ INTRO = '/screenly/intro-template.html'
 
 current_browser_url = None
 browser = None
+browser_focus_lost = False
 
 VIDEO_TIMEOUT = 20  # secs
 
@@ -175,13 +176,14 @@ class Scheduler(object):
         # Try to keep the same position in the play list. E.g. if a new asset is added to the end of the list, we
         # don't want to start over from the beginning.
         self.index = self.index % len(self.assets) if self.assets else 0
-        logging.debug('update_playlist done, count %s, counter %s, index %s, deadline %s', len(self.assets), self.counter, self.index, self.deadline)
+        logging.debug('update_playlist done, count %s, counter %s, index %s, deadline %s', len(self.assets),
+                      self.counter, self.index, self.deadline)
 
     def get_db_mtime(self):
         # get database file last modification time
         try:
             return path.getmtime(settings['database'])
-        except:
+        except (OSError, TypeError):
             return 0
 
 
@@ -240,13 +242,21 @@ def load_browser(url=None):
 
 
 def browser_send(command, cb=lambda _: True):
+    global browser_focus_lost
     if not (browser is None) and browser.process.alive:
         while not browser.process._pipe_queue.empty():  # flush stdout
             browser.next()
 
         browser.process.stdin.put(command + '\n')
         while True:  # loop until cb returns True
-            if cb(browser.next()):
+            try:
+                event = browser.next()
+            except StopIteration:
+                break
+            if 'FOCUS_LOST' in event:
+                browser_focus_lost = True
+                break
+            if cb(event):
                 break
     else:
         logging.info('browser found dead, restarting')
@@ -374,6 +384,7 @@ def load_settings():
 
 
 def asset_loop(scheduler):
+    global browser_focus_lost
     disable_update_check = getenv("DISABLE_UPDATE_CHECK", False)
     if not disable_update_check:
         check_update()
@@ -395,7 +406,7 @@ def asset_loop(scheduler):
         elif 'web' in mime:
             # FIXME If we want to force periodic reloads of repeated web assets, force=True could be used here.
             # See e38e6fef3a70906e7f8739294ffd523af6ce66be.
-            browser_url(uri)
+            browser_url(uri, cb=lambda b: 'LOAD_FINISH' in b)
         elif 'video' or 'streaming' in mime:
             view_video(uri, asset['duration'])
         else:
@@ -405,6 +416,9 @@ def asset_loop(scheduler):
             duration = int(asset['duration'])
             logging.info('Sleeping for %s', duration)
             sleep(duration)
+            if browser_focus_lost:
+                browser_focus_lost = False
+                browser_send('exit')
     else:
         logging.info('Asset %s at %s is not available, skipping.', asset['name'], asset['uri'])
         sleep(0.5)
@@ -458,6 +472,6 @@ def main():
 if __name__ == "__main__":
     try:
         main()
-    except:
+    except Exception:
         logging.exception("Viewer crashed.")
         raise