mirror of
https://github.com/searxng/searxng.git
synced 2025-07-11 23:39:18 +02:00
f798ddd492
This patch migrates from `redis==5.2.1` [1] to `valkey==6.1.0` [2].
The migration to valkey is necessary because the company behind Redis has decided
to abandon the open source license. After experiencing a drop in user numbers,
they now want to run it under a dual license again. But this move demonstrates
once again how unreliable the company is and how it treats open source
developers.
To review first, read the docs::
$ make docs.live
Follow the instructions to remove redis:
- http://0.0.0.0:8000/admin/settings/settings_redis.html
Config and install a local valkey DB:
- http://0.0.0.0:8000/admin/settings/settings_valkey.html
[1] https://pypi.org/project/redis/
[2] https://pypi.org/project/valkey/
Co-authored-by: HLFH <gaspard@dhautefeuille.eu>
Co-authored-by: Markus Heiser <markus.heiser@darmarit.de>
58 lines
2.5 KiB
Python
58 lines
2.5 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
|
|
# pylint: disable=missing-module-docstring
|
|
"""Lame scheduler which use Valkey as a source of truth:
|
|
* the Valkey key SearXNG_checker_next_call_ts contains the next time the embedded checker should run.
|
|
* to avoid lock, a unique Valkey script reads and updates the Valkey key SearXNG_checker_next_call_ts.
|
|
* this Valkey script returns a list of two elements:
|
|
* the first one is a boolean. If True, the embedded checker must run now in this worker.
|
|
* the second element is the delay in second to wait before the next call to the Valkey script.
|
|
|
|
This scheduler is not generic on purpose: if more feature are required, a dedicate scheduler must be used
|
|
(= a better scheduler should not use the web workers)
|
|
"""
|
|
|
|
import logging
|
|
import time
|
|
from pathlib import Path
|
|
from typing import Callable
|
|
|
|
from searx.valkeydb import client as get_valkey_client
|
|
from searx.valkeylib import lua_script_storage
|
|
|
|
|
|
logger = logging.getLogger('searx.search.checker')
|
|
|
|
SCHEDULER_LUA = Path(__file__).parent / "scheduler.lua"
|
|
|
|
|
|
def scheduler_function(start_after_from: int, start_after_to: int, every_from: int, every_to: int, callback: Callable):
|
|
"""Run the checker periodically. The function never returns.
|
|
|
|
Parameters:
|
|
* start_after_from and start_after_to: when to call "callback" for the first on the Valkey instance
|
|
* every_from and every_to: after the first call, how often to call "callback"
|
|
|
|
There is no issue:
|
|
* to call this function is multiple workers
|
|
* to kill workers at any time as long there is one at least one worker
|
|
"""
|
|
scheduler_now_script = SCHEDULER_LUA.open().read()
|
|
while True:
|
|
# ask the Valkey script what to do
|
|
# the script says
|
|
# * if the checker must run now.
|
|
# * how to long to way before calling the script again (it can be call earlier, but not later).
|
|
script = lua_script_storage(get_valkey_client(), scheduler_now_script)
|
|
call_now, wait_time = script(args=[start_after_from, start_after_to, every_from, every_to])
|
|
|
|
# does the worker run the checker now?
|
|
if call_now:
|
|
# run the checker
|
|
try:
|
|
callback()
|
|
except Exception: # pylint: disable=broad-except
|
|
logger.exception("Error calling the embedded checker")
|
|
# only worker display the wait_time
|
|
logger.info("Next call to the checker in %s seconds", wait_time)
|
|
# wait until the next call
|
|
time.sleep(wait_time)
|