add error mail

app.py

@@ -6,6 +6,7 @@ from depicts import (utils, wdqs, commons, mediawiki, painting, saam, database,
                      wd_catalog)
 from depicts.pager import Pagination, init_pager
 from depicts.model import DepictsItem, DepictsItemAltLabel, Edit, PaintingItem
+from depicts.error_mail import setup_error_mail
 from requests_oauthlib import OAuth1Session
 from urllib.parse import urlencode
 from werkzeug.exceptions import InternalServerError
@@ -26,6 +27,7 @@ app = Flask(__name__)
 app.config.from_object('config.default')
 database.init_db(app.config['DB_URL'])
 init_pager(app)
+setup_error_mail(app)
 
 find_more_props = {
     'P135': 'movement',

depicts/error_mail.py

@@ -0,0 +1,32 @@
+import logging
+from logging.handlers import SMTPHandler
+from logging import Formatter
+
+PROJECT = 'depicts'
+
+class MatcherSMTPHandler(SMTPHandler):
+    def getSubject(self, record):  # noqa: N802
+        return (f'{PROJECT} error: {record.exc_info[0].__name__}'
+                if (record.exc_info and record.exc_info[0])
+                else f'{PROJECT} error: {record.pathname}:{record.lineno:d}')
+
+def setup_error_mail(app):
+    mail_handler = MatcherSMTPHandler(app.config['SMTP_HOST'],
+                                      app.config['MAIL_FROM'],
+                                      app.config['ADMINS'],
+                                      app.name + ' error')
+    mail_handler.setFormatter(Formatter('''
+    Message type:       %(levelname)s
+    Location:           %(pathname)s:%(lineno)d
+    Module:             %(module)s
+    Function:           %(funcName)s
+    Time:               %(asctime)s
+
+    Message:
+
+    %(message)s
+    '''))
+
+    mail_handler.setLevel(logging.ERROR)
+    app.logger.propagate = True
+    app.logger.addHandler(mail_handler)