Avoid UnicodeEncodeError during generation of email with mail_admins logger

[Antoine Humbert]

When using localization (USE_L10N = True), generated message for mails triggered by the mail_admins logger may contains some non-ascii characters depending on current locale.

This is the case for the display of server_time if current locale is french :
In django.views.debug.py, the TECHNICAL_500_TEXT_TEMPLATE contains
Server time: {{server_time|date:"r"}}
which results, for example, in the following unicode string, for a french locale :
lun, 6 Fév 2017 15:15:32 +0100

A solution would be to use a locale independant format (as suggested by the use_l10n=False defined in Context object created at ExceptionReporter.get_traceback_text), such as "c" format.

[Tim Graham]

Can you provide the complete traceback? Does it happen on Python 3?

[Antoine Humbert]

The problem occurs in python 2.7.

The complete traceback is :

Traceback (most recent call last):
File "site-packages/django/core/handlers/wsgi.py", line 170, in __call__
 response = self.get_response(request)
File "site-packages/django/core/handlers/base.py", line 124, in get_response
 response = self._middleware_chain(request)
File "site-packages/django/core/handlers/exception.py", line 41, in inner
 response = response_for_exception(request, exc)
File "site-packages/django/core/handlers/exception.py", line 86, in response_for_exception
 response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
File "site-packages/django/core/handlers/exception.py", line 124, in handle_uncaught_exception
 extra={'status_code': 500, 'request': request},
File "/usr/lib64/python2.7/logging/__init__.py", line 1175, in error
 self._log(ERROR, msg, args, **kwargs)
File "/usr/lib64/python2.7/logging/__init__.py", line 1268, in _log
 self.handle(record)
File "/usr/lib64/python2.7/logging/__init__.py", line 1278, in handle
 self.callHandlers(record)
File "/usr/lib64/python2.7/logging/__init__.py", line 1318, in callHandlers
 hdlr.handle(record)
File "/usr/lib64/python2.7/logging/__init__.py", line 749, in handle
 self.emit(record)
File "site-packages/django/utils/log.py", line 121, in emit
 self.send_mail(subject, message, fail_silently=True, html_message=html_message)
File "site-packages/django/utils/log.py", line 124, in send_mail
 mail.mail_admins(subject, message, *args, connection=self.connection(), **kwargs)
File "site-packages/django/core/mail/__init__.py", line 103, in mail_admins
 mail.send(fail_silently=fail_silently)
File "site-packages/django/core/mail/message.py", line 342, in send
 return self.get_connection(fail_silently).send_messages([self])
File "site-packages/django/core/mail/backends/smtp.py", line 107, in send_messages
 sent = self._send(message)
File "site-packages/django/core/mail/backends/smtp.py", line 123, in _send
 self.connection.sendmail(from_email, recipients, message.as_bytes(linesep='\\r\\n'))
[Mon Feb 06 13:50:53.064235 2017]   File "site-packages/django/core/mail/message.py", line 180, in as_string
 g.flatten(self, unixfrom=unixfrom)
File "site-packages/email/generator.py", line 84, in flatten
self._write(msg)
File "site-packages/email/generator.py", line 109, in _write
 self._dispatch(msg)
File "site-packages/email/generator.py", line 135, in _dispatch
 meth(msg)
File "site-packages/email/generator.py", line 178, in _handle_text
 self._fp.write(payload)
UnicodeEncodeError: 'ascii' codec can't encode character u'\\xe9' in position 1124: ordinal not in range(128)`

[Tim Graham]

The Django master branch no longer supports Python 2, so I think the time for fixing this (if it's a valid issue -- I haven't investigated the details) has passed.