[server] introduce a scheduler class to run repository "looping tasks"
We just use the sched module from the standard library and introduce a tiny
Python2/3 compatibility layer (more for convenience actually). The "looping"
aspect of tasks (previously in LoopTask class) is re-implemeted as a
`schedule_periodic_task` function. This is a reasonably thin layer as compared
to LoopTask/TasksManager classes. Only the "restart" aspect of LoopTask is no
longer present as I'm not sure it's worth keeping.
The advantage of using this (in addition to eventually dropping our custom
code) is that this scheduler class provides a `run` method that blocks the
process while running tasks in its queue. So we can rely on this to have a
'scheduler' ctl command (see forthcoming patch) that would only run "looping
tasks" without having to implement the "blocking" aspect ourself.
Related to #17057223.
include README
include README.pyramid.rst
include COPYING
include COPYING.LESSER
include pylintrc
include jshintrc
include tox.ini
include flake8-ok-files.txt
include bin/cubicweb-*
include man/cubicweb-ctl.1
recursive-include extras *.bash_completion
include doc/*.rst
include doc/*.txt
include doc/Makefile
recursive-include doc/book *
recursive-include doc/tools *.py
recursive-include doc/tutorials *.rst *.py
recursive-include doc/api *.rst
recursive-include doc/_themes *
recursive-include doc/_static *
include doc/_templates/*.html
include doc/changes/*.rst
recursive-include doc/dev *.txt *.rst
recursive-include doc/images *.png *.svg
include doc/conf.py
include cubicweb/devtools/fix_po_encoding
recursive-include cubicweb/misc *.py *.png *.display
include cubicweb/web/views/*.pt
recursive-include cubicweb/web/data external_resources *.js *.css *.py *.png *.gif *.ico *.ttf *.svg *.woff *.eot
recursive-include cubicweb/web/wdoc *.rst *.png *.xml
recursive-include cubicweb/devtools/data *.js *.css *.sh
recursive-include cubicweb/i18n *.po
recursive-include cubicweb/schemas *.py *.sql
recursive-include requirements *.txt
recursive-include cubicweb/test/data bootstrap_cubes *.py *.sql
recursive-include cubicweb/test/data-rewrite bootstrap_cubes *.py
recursive-include cubicweb/test/data_schemareader *.py
recursive-include cubicweb/dataimport/test/data *.py *.csv *.txt
recursive-include cubicweb/dataimport/test/data-massimport *.py
recursive-include cubicweb/devtools/test/data *.py *.txt *.js *.po.ref
recursive-include cubicweb/entities/test/data *.py
recursive-include cubicweb/etwist/test/data *.py
recursive-include cubicweb/ext/test/data *.py
recursive-include cubicweb/hooks/test/data-computed *.py
recursive-include cubicweb/hooks/test/data *.py
recursive-include cubicweb/sobjects/test/data bootstrap_cubes *.py
recursive-include cubicweb/server/test/data bootstrap_cubes *.py source* *.conf.in *.ldif
recursive-include cubicweb/server/test/data-cwep002 *.py
recursive-include cubicweb/server/test/datacomputed *.py
recursive-include cubicweb/server/test/data-schema2sql toignore
recursive-include cubicweb/server/test/data-migractions bootstrap_cubes *.py
recursive-include cubicweb/server/test/data-schemaserial *.py
include cubicweb/web/test/testutils.js
recursive-include cubicweb/web/test/data bootstrap_cubes pouet.css *.py
recursive-include cubicweb/web/test/data/static/jstests *.js *.html *.json
include cubicweb/web/data/jquery-treeview/*.md
recursive-include cubicweb/skeleton *.py *.css *.js *.po compat *.tmpl rules
prune cubicweb/misc/cwfs