Allow aborting currently shown asset via SIGUSR1

viewer.py

@@ -10,14 +10,15 @@
 from datetime import datetime, timedelta
 from glob import glob
 from os import path, getenv, remove, makedirs
-from os import stat as os_stat, utime
+from os import stat as os_stat, utime, system
 from platform import machine
 from random import shuffle
 from requests import get as req_get
 from stat import S_ISFIFO
 from subprocess import Popen, call
 from time import sleep, time
 import logging
+import signal
 
 from settings import settings
 import html_templates
@@ -31,6 +32,14 @@
 last_settings_refresh = None
 
 
+#This is the signal handler for SIGUSR1
+#After this returns all sleep() calls are aborted
+#Since we also kill omxplayer it means we abort 
+#displaying the current asset
+def sigusr1(signum, frame):
+	logging.info("Skip current asset")
+        system("killall omxplayer.bin")
+
 class Scheduler(object):
     def __init__(self, *args, **kwargs):
         logging.debug('Scheduler init')
@@ -249,6 +258,10 @@ def reload_settings():
 
 if __name__ == "__main__":
 
+    #Install signal handler
+    signal.signal(signal.SIGUSR1, sigusr1)
+
+
     # Before we start, reload the settings.
     reload_settings()