[fix] checker: don't run the checker when uwsgi is not properly configured

Before this commit, even with the scheduler disabled, the checker was running
at least once for each uwsgi worker.

searx/search/checker/background.py

@@ -40,7 +40,8 @@ def get_result():
         return json.loads(serialized_result)
 
 
-def _set_result(result):
+def _set_result(result, include_timestamp=True):
+    if include_timestamp:
         result['timestamp'] = int(time.time() / 3600) * 3600
     storage.set_str(CHECKER_RESULT, json.dumps(result))
 
@@ -82,7 +83,7 @@ def _run_with_delay():
 
 def _start_scheduling():
     every = _get_every()
-    schedule(every[0], _run_with_delay)
+    if schedule(every[0], _run_with_delay):
         run()
 
 
@@ -111,7 +112,7 @@ def initialize():
         return
 
     #
-    _set_result({'status': 'unknown'})
+    _set_result({'status': 'unknown'}, include_timestamp=False)
 
     start_after = scheduling.get('start_after', (300, 1800))
     start_after = _get_interval(start_after, 'checker.scheduling.start_after is not a int or list')

searx/shared/__init__.py

@@ -22,7 +22,7 @@ else:
         from .shared_simple import SimpleSharedDict as SharedDict
 
         def schedule(delay, func, *args):
-            pass
+            return False
     else:
         # uwsgi
         from .shared_uwsgi import UwsgiCacheSharedDict as SharedDict, schedule

searx/shared/shared_simple.py

@@ -36,3 +36,4 @@ def schedule(delay, func, *args):
         func(*args)
 
     call_later()
+    return True

searx/shared/shared_uwsgi.py

@@ -61,3 +61,4 @@ def schedule(delay, func, *args):
     _last_signal += 1
     uwsgi.register_signal(signal_num, 'worker', sighandler)
     uwsgi.add_timer(signal_num, delay)
+    return True