[FIX] google_calendar: synchronization cron timeout

In a database with many users / events to synchronize, the cron
`ir_cron_sync_all_cals` may time out. Consequently, even if a `commit`
is performed for each user, some users are never synchronized.

In this commit, we first sort the users by last synchronization date,
meaning that all users will ultimately be synchronized, even if the cron
times out. On top of that, we introduce the context key
`last_sync_hours` to prevent the synchronization in case the cron is
restarted after timeout.

opw-2158372

closes odoo/odoo#45017

X-original-commit: 2f21def6
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>
Co-authored-by: Nicolas Martinelli <nim@odoo.com>

addons/google_calendar/data/google_calendar_data.xml

@@ -5,7 +5,13 @@
             <field name="name">Google Calendar: synchronization</field>
             <field name="model_id" ref="model_google_calendar"/>
             <field name="state">code</field>
-            <field name="code">model.synchronize_events_cron()</field>
+            <field name="code">
+# The context key 'last_sync_hours' allows specifying the minimum delay between consecutive syncs.
+# Indeed, in case there are many users / events to sync, the cron might time out. In this case, the
+# solution is to force the last_sync_hours to the expected synchronization interval expected. This
+# will avoid the synchronization of users that succeeded in the previous failing cron.
+model.synchronize_events_cron()
+            </field>
             <field name="user_id" ref="base.user_root" />
             <field name="interval_number">12</field>
             <field name="interval_type">hours</field>
@@ -13,4 +19,4 @@
             <field eval="False" name="doall" />
         </record>
     </data>
-</odoo>
\ No newline at end of file
+</odoo>

addons/google_calendar/models/google_calendar.py

@@ -12,6 +12,7 @@ import pytz
 from werkzeug import urls
 
 from odoo import api, fields, models, tools, _
+from odoo.osv import expression
 from odoo.tools import exception_to_unicode
 
 _logger = logging.getLogger(__name__)
@@ -551,7 +552,15 @@ class GoogleCalendar(models.AbstractModel):
     @api.model
     def synchronize_events_cron(self):
         """ Call by the cron. """
-        users = self.env['res.users'].search([('google_calendar_last_sync_date', '!=', False)])
+        domain = [('google_calendar_last_sync_date', '!=', False)]
+        if self.env.context.get('last_sync_hours'):
+            last_sync_hours = self.env.context['last_sync_hours']
+            last_sync_date = datetime.now() - timedelta(hours=last_sync_hours)
+            domain = expression.AND([
+                domain,
+                [('google_calendar_last_sync_date', '<=', fields.Datetime.to_string(last_sync_date))]
+            ])
+        users = self.env['res.users'].search(domain, order='google_calendar_last_sync_date')
         _logger.info("Calendar Synchro - Started by cron")
 
         for user_to_sync in users.ids: