WSGI: Start timerserver from wsgi script

This is a step to be able to run ERP5 on zope4, where servers are no longer started by ZConfig.

This will be used by nexedi/slapos!1114

See merge request nexedi/erp5!1529

product/ERP5/bin/zopewsgi.py

@@ -158,6 +158,7 @@ def runwsgi():
     parser.add_argument('-w', '--webdav', action='store_true')
     parser.add_argument('address', help='<ip>:<port>')
     parser.add_argument('zope_conf', help='path to zope.conf')
+    parser.add_argument('--timerserver-interval', help='Interval for timerserver', type=float)
     args = parser.parse_args()
 
     startup = os.path.dirname(Zope2.Startup.__file__)
@@ -169,6 +170,13 @@ def runwsgi():
     from Signals.SignalHandler import SignalHandler
     SignalHandler.registerHandler(signal.SIGTERM, sys.exit)
 
+    if args.timerserver_interval:
+      import Products.TimerService
+      Products.TimerService.timerserver.TimerServer.TimerServer(
+          module='Zope2',
+          interval=args.timerserver_interval,
+      )
+
     ip, port = splitport(args.address)
     port = int(port)
     createServer(

product/TimerService/timerserver/TimerServer.py

@@ -101,8 +101,8 @@ class TimerServer(threading.Thread):
                 err = StringIO()
                 response = TimerResponse(out, err)
                 handle(module, TimerRequest(response, interval), response)
-            except:
-                pass
+            except Exception:
+                logger.warn("Ignoring exception in run loop", exc_info=True)
 
 
 TIMER_SERVICE_PATH = '/Control_Panel/timer_service'
@@ -110,7 +110,7 @@ TIMER_ENVIRON = {
     'REQUEST_METHOD': 'GET',
     'SERVER_SOFTWARE': 'TimerServer for Zope',
     'SERVER_NAME': '',
-    'SERVER_PORT': '',
+    'SERVER_PORT': '-1',
     'REMOTE_ADDR': '',
     'GATEWAY_INTERFACE': 'CGI/1.1',
     'SERVER_PROTOCOL': 'HTTP/1.0',