[FIX] server.py: cron trigger in recovery

When setting up the PG replication, the slave is considered in recovery
mode. However, `LISTEN / NOTIFY` is not supported in this mode, leading
to an endless loop of crashes.

In recovery mode, we simply deactivate the feature.

closes odoo/odoo#87619

X-original-commit: 6389a64953081130d62f2a1703a27ddfa751098b
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

odoo/service/server.py

@@ -430,7 +430,13 @@ class ThreadedServer(CommonServer):
         conn = odoo.sql_db.db_connect('postgres')
         with conn.cursor() as cr:
             pg_conn = cr._cnx
-            cr.execute("LISTEN cron_trigger")
+            # LISTEN / NOTIFY doesn't work in recovery mode
+            cr.execute("SELECT pg_is_in_recovery()")
+            in_recovery = cr.fetchone()[0]
+            if not in_recovery:
+                cr.execute("LISTEN cron_trigger")
+            else:
+                _logger.warning("PG cluster in recovery mode, cron trigger not activated")
             cr.commit()
 
             while True:
@@ -1162,7 +1168,13 @@ class WorkerCron(Worker):
 
         dbconn = odoo.sql_db.db_connect('postgres')
         self.dbcursor = dbconn.cursor()
-        self.dbcursor.execute("LISTEN cron_trigger")
+        # LISTEN / NOTIFY doesn't work in recovery mode
+        self.dbcursor.execute("SELECT pg_is_in_recovery()")
+        in_recovery = self.dbcursor.fetchone()[0]
+        if not in_recovery:
+            self.dbcursor.execute("LISTEN cron_trigger")
+        else:
+            _logger.warning("PG cluster in recovery mode, cron trigger not activated")
         self.dbcursor.commit()
 
     def stop(self):