use systemd watchdog

archiver.py

@@ -7,6 +7,7 @@ from pathlib import Path
 
 import humanize
 import yaml
+from sdnotify import SystemdNotifier
 
 from iarchiver.database import EmailDatabase
 from iarchiver.email import unix_timestamp_since_to_imap_timestamp
@@ -33,6 +34,7 @@ def main(args):
     attachments_dir = Path(config['attachments_path'])
     attachments_dir.mkdir(parents=True, exist_ok=True)
 
+    notifier = SystemdNotifier()
     database = EmailDatabase(Path(config['database_path']))
     mail = MailConnection(config['server'], config['username'], config['password'], attachments_dir, save_inline_attachments=save_inline_attachments)
     mail.load_folders()
@@ -43,12 +45,12 @@ def main(args):
     num_folders_to_sync = len(mail.folder_structure)
     logger.info(f'Syncing {num_folders_to_sync} folders...')
 
+    last_refresh_imap_date = None
     if args.full:
         last_refresh = None
         logger.info('Performing full sync...')
     else:
         last_refresh = database.have_we_done_a_full_sync_at_all()
-        last_refresh_imap_date = None
     if last_refresh:
         last_refresh_imap_date = unix_timestamp_since_to_imap_timestamp(last_refresh)
         logger.info(f'Syncing emails received after {last_refresh_imap_date}')
@@ -76,6 +78,7 @@ def main(args):
                 new_emails += 1
             if len(attachments):
                 new_attachments += 1
+            notifier.notify("WATCHDOG=1")
 
     elapsed = datetime.now() - sync_start_time
     database.finish_sync('refresh' if not did_full_sync else 'full', new_emails, new_attachments, int(elapsed.total_seconds()))

requirements.txt

@@ -4,4 +4,5 @@ humanize==4.9.0
 mmh3==4.1.0
 flask==3.0.2
 python-magic==0.4.27
-flask_httpauth==4.8.0
+flask_httpauth==4.8.0
+sdnotify==0.3.2

systemd/imaparchiver.service

@@ -8,7 +8,8 @@ User=emailsync
 Group=emailsync
 ExecStart=/srv/email/imap-archiver/venv/bin/python3 /srv/email/imap-archiver/run.py --config /srv/email/imap-archiver/config.yml
 SyslogIdentifier=imap-archiver
-Restart=on-failure
+Restart=always
+WatchdogSec=60
 
 [Install]
 WantedBy=multi-user.target

systemd/imapviewer.service

@@ -9,7 +9,7 @@ Group=emailsync
 EnvironmentFile=/etc/secrets/imapviewer
 ExecStart=/srv/email/imap-archiver/venv/bin/python3 /srv/email/imap-archiver/server.py
 SyslogIdentifier=imap-viewer
-Restart=on-failure
+Restart=always
 
 [Install]
 WantedBy=multi-user.target