app/send_mail.py

# Copyright 2010 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from google.appengine.api import mail
from google.appengine.api import mail_errors
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app
import logging


class EmailSender(webapp.RequestHandler):
    """Simple handler to send email; intended to be called from a taskqueue
    task so email sending can be throttled to stay below app engine quotas."""
    def post(self):
        self.send_mail(sender=self.request.get('sender'),
                       subject=self.request.get('subject'),
                       to=self.request.get('to'),
                       body=self.request.get('body'))

    @staticmethod
    def send_mail(sender, subject, to, body):
        """Send mail.
        """
        logging.info('Sending mail: recipient %r, subject %r' % (to, subject))
        try:
            mail.send_mail(sender=sender, subject=subject, to=to, body=body)
        except mail_errors.Error, e:
            # we swallow mail_error exceptions on send, since they're not ever
            # transient
            logging.error('EmailSender (to: %s, subject: %s), '
                          'failed with exception %s' % (to, subject, e))


if __name__ == '__main__':
    run_wsgi_app(webapp.WSGIApplication([('.*', EmailSender)]))