[FIX] bus: fix interface error on server stop

When stopping the server, all cursors are closed. The issue is that
the ImDispatch thread is kept alive until the main thread exits.

This can lead to errors during server stop: the ImDispatch thread
could try to poll an already closed connection thus raising a
`psycopg2.InterfaceError` exception.

This commit solves the issue by hiding the interface error when
it occurs during server stop.

closes odoo/odoo#100002

X-original-commit: 83777078f1be093c218267c8282e8c11f4fb4e8d
Signed-off-by: Julien Castiaux <juc@odoo.com>

addons/bus/models/bus.py

@@ -6,9 +6,11 @@ import random
 import selectors
 import threading
 import time
+from psycopg2 import InterfaceError
 
 import odoo
 from odoo import api, fields, models
+from odoo.service.server import CommonServer
 from odoo.tools.misc import DEFAULT_SERVER_DATETIME_FORMAT
 from odoo.tools import date_utils
 
@@ -150,7 +152,7 @@ class ImDispatch(threading.Thread):
             cr.commit()
             conn = cr._cnx
             sel.register(conn, selectors.EVENT_READ)
-            while True:
+            while not stop_event.is_set():
                 if sel.select(TIMEOUT):
                     conn.poll()
                     channels = []
@@ -165,14 +167,18 @@ class ImDispatch(threading.Thread):
                         websocket.trigger_notification_dispatching()
 
     def run(self):
-        while True:
+        while not stop_event.is_set():
             try:
                 self.loop()
-            except Exception:
+            except Exception as exc:
+                if isinstance(exc, InterfaceError) and stop_event.is_set():
+                    continue
                 _logger.exception("Bus.loop error, sleep and retry")
                 time.sleep(TIMEOUT)
 
 dispatch = None
+stop_event = threading.Event()
 if not odoo.multi_process or odoo.evented:
     # We only use the event dispatcher in threaded and gevent mode
     dispatch = ImDispatch()
+    CommonServer.on_stop(stop_event.set)