[ADD] base: add support for custom imbus & cron_trigger postgres notifications

This patch provides the possibility to implement a custom security layer on top
of Odoo's imbus notification system and ir_cron live triggering system.

The key addition is the `ODOO_NOTIFY_FUNCTION` environment variable (opt-in),
which can now define a custom postgresql function to be called instead of the
default `pg_notify` function. This allows for greater flexibility and control
over the notification and triggering mechanisms within Odoo.

closes odoo/odoo#140089

Signed-off-by: Fabien Meghazi (fme) <fme@odoo.com>

addons/bus/models/bus.py

@@ -3,11 +3,12 @@ import contextlib
 import datetime
 import json
 import logging
+import os
 import random
 import selectors
 import threading
 import time
-from psycopg2 import InterfaceError
+from psycopg2 import InterfaceError, sql
 
 import odoo
 from odoo import api, fields, models
@@ -20,6 +21,9 @@ _logger = logging.getLogger(__name__)
 # longpolling timeout connection
 TIMEOUT = 50
 
+# custom function to call instead of default PostgreSQL's `pg_notify`
+ODOO_NOTIFY_FUNCTION = os.getenv('ODOO_NOTIFY_FUNCTION', 'pg_notify')
+
 #----------------------------------------------------------
 # Bus
 #----------------------------------------------------------
@@ -77,7 +81,8 @@ class ImBus(models.Model):
             @self.env.cr.postcommit.add
             def notify():
                 with odoo.sql_db.db_connect('postgres').cursor() as cr:
-                    cr.execute("notify imbus, %s", (json_dump(list(channels)),))
+                    query = sql.SQL("SELECT {}('imbus', %s)").format(sql.Identifier(ODOO_NOTIFY_FUNCTION))
+                    cr.execute(query, (json_dump(list(channels)), ))
 
     @api.model
     def _sendone(self, channel, notification_type, message):