[FIX] hw_scale: Adam scale wait time

When opening the weight screen in PoS it can take up to 10 seconds
until the weighting starts. This can be resolved by using a
Threading.Event instead to reset the 10 second sleep time.

Using exit_flag.wait(timeout=DELAY) will be more responsive, because
you'll break out of the while loop instantly when exit_flag is set. With
time.sleep(timeout=DELAY), even after the event is set, you're going to wait around in
the time.sleep call until you've slept for DELAY seconds.

closes odoo/odoo#32389

Signed-off-by: Olivier Dony (odo) <odo@openerp.com>

addons/hw_scale/controllers/main.py

@@ -8,7 +8,7 @@ import time
 
 from collections import namedtuple
 from os import listdir
-from threading import Thread, Lock
+from threading import Event, Lock, Thread
 
 from odoo import http
 
@@ -134,6 +134,7 @@ class Scale(Thread):
         self.path_to_scale = ''
         self.protocol = None
         self.disabled = False
+        self.weight_request_event = Event()
 
     def lockedstart(self):
         with self.lock:
@@ -261,8 +262,8 @@ class Scale(Thread):
             return None
 
     def get_weight(self):
-        self.repeats = 5
         self.disabled = False
+        self.weight_request_event.set()
         self.lockedstart()
         return self.weight
 
@@ -361,11 +362,13 @@ class Scale(Thread):
                         self.device = self.get_device()
                     if not self.device:
                         # retry later to support "plug and play"
-                        time.sleep(10)
+                        self.weight_request_event.clear()
+                        self.weight_request_event.wait(10)
                     else: 
                         self.disabled = self.protocol.disable
             else:
-                time.sleep(10)
+                self.weight_request_event.clear()
+                self.weight_request_event.wait(10)
 
 
 scale_thread = None