[IMP] web_assets_warmup: Add database lock in post_load_hook

With dedicated services for odoo web and odoo cron
we can get a serialize access error on startup

web_assets_warmup/hooks.py

@@ -1,9 +1,12 @@
 # Copyright 2020 Camptocamp SA
+# Copyright 2023 Michael Tietz (MT Software) <mtietz@mt-software.de>
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl)
 
 import logging
 import os
 
+import psycopg2
+
 from odoo import fields, registry
 
 logger = logging.getLogger(__name__)
@@ -32,6 +35,14 @@ def active_cron_assets():
             model, res_id = row
             if model != "ir.cron":
                 return
+            # if there is already someone doing the same or already being executed
+            # we can skip the update of ir_cron
+            try:
+                with cr.savepoint():
+                    cr.execute(
+                        "SELECT * FROM ir_cron WHERE id = %s FOR UPDATE NOWAIT;",
+                        (res_id,),
+                    )
                     query = """
                         UPDATE ir_cron
                         SET active=true, nextcall=%s, priority=%s
@@ -46,6 +57,13 @@ def active_cron_assets():
                         cron_ref,
                         nextcall,
                     )
+            except psycopg2.OperationalError as e:
+                if e.pgcode == "55P03":
+                    logger.info(
+                        "Cron '%s.%s' is currently being executed or updated",
+                        cron_module,
+                        cron_ref,
+                    )
 
 
 def post_load_hook():

web_assets_warmup/readme/CONTRIBUTORS.rst

@@ -1 +1,2 @@
 * Sébastien Alix <sebastien.alix@camptocamp.com>
+* Michael Tietz (MT Software) <mtietz@mt-software.de>