celery: celery 4.X support. Fixes #4169

- update tasks
- enabled celerybeat to function
- check and cleanup code for 4.X

configs/production.ini

@@ -271,28 +271,15 @@ labs_settings_active = true
 ###        CELERY CONFIG        ####
 ####################################
 use_celery = false
-broker.host = localhost
-broker.vhost = rabbitmqhost
-broker.port = 5672
-broker.user = rabbitmq
-broker.password = qweqwe
 
-celery.imports = rhodecode.lib.celerylib.tasks
+# connection url to the message broker (default rabbitmq)
+celery.broker_url = amqp://rabbitmq:qweqwe@localhost:5672/rabbitmqhost
 
-celery.result.backend = amqp
-celery.result.dburi = amqp://
-celery.result.serialier = json
-
-#celery.send.task.error.emails = true
-#celery.amqp.task.result.expires = 18000
-
-celeryd.concurrency = 2
-#celeryd.log.file = celeryd.log
-celeryd.log.level = debug
-celeryd.max.tasks.per.child = 1
+# maximum tasks to execute before worker restart
+celery.max_tasks_per_child = 100
 
 ## tasks will never be sent to the queue, but executed locally instead.
-celery.always.eager = false
+celery.task_always_eager = false
 
 ####################################
 ###         BEAKER CACHE        ####
@@ -619,7 +606,7 @@ custom.conf = 1
 ### LOGGING CONFIGURATION   ####
 ################################
 [loggers]
-keys = root, sqlalchemy, beaker, rhodecode, ssh_wrapper
+keys = root, sqlalchemy, beaker, rhodecode, ssh_wrapper, celery
 
 [handlers]
 keys = console, console_sql
@@ -658,6 +645,11 @@ handlers =
 qualname = ssh_wrapper
 propagate = 1
 
+[logger_celery]
+level = DEBUG
+handlers =
+qualname = celery
+
 
 ##############
 ## HANDLERS ##