increase reply to address validation timeout on preview

Celery/SQS underperforms in low-traffic environments. Tasks will sit on
celery queues for several seconds before getting picked up if they're
the only thing on the queue. This is observable in our test environments
like preview and staging, but we've got enough load on production that
this isn't an issue.

When we validate reply to email addresses, we expect a delivery receipt
to have been processed within 45 seconds of the button being pressed. On
preview, we often observe times over that, possibly due to the several
queues involved in sending an email and processing its receipt. So, to
ensure that functional tests can pass (when we don't really care how
fast things are, just that the flow doesn't break), bump this timeout up
to 120 seconds on preview. The functional tests were waiting for 120
seconds for the reply to address to be validated anyway.

app/config.py

@@ -72,6 +72,8 @@ class Config(object):
     ACTIVITY_STATS_LIMIT_DAYS = 7
     TEST_MESSAGE_FILENAME = 'Report'
 
+    REPLY_TO_EMAIL_ADDRESS_VALIDATION_TIMEOUT = 45
+
     NOTIFY_ENVIRONMENT = 'development'
     LOGO_UPLOAD_BUCKET_NAME = 'public-logos-local'
     MOU_BUCKET_NAME = 'local-mou'
@@ -147,6 +149,9 @@ class Preview(Config):
     ASSET_DOMAIN = 'static.notify.works'
     ASSET_PATH = 'https://static.notify.works/'
 
+    # On preview, extend the validation timeout to allow more leniency when running functional tests
+    REPLY_TO_EMAIL_ADDRESS_VALIDATION_TIMEOUT = 120
+
 
 class Staging(Config):
     SHOW_STYLEGUIDE = False

app/main/views/service_settings.py

@@ -478,7 +478,8 @@ def get_service_verify_reply_to_address_partials(service_id, notification_id):
     created_at_no_tz = notification["created_at"][:-6]
     seconds_since_sending = (datetime.utcnow() - datetime.strptime(created_at_no_tz, '%Y-%m-%dT%H:%M:%S.%f')).seconds
     if notification["status"] in FAILURE_STATUSES or (
-        notification["status"] in SENDING_STATUSES and seconds_since_sending > 45
+        notification["status"] in SENDING_STATUSES and
+        seconds_since_sending > current_app.config['REPLY_TO_EMAIL_ADDRESS_VALIDATION_TIMEOUT']
     ):
         verification_status = "failure"
         form.email_address.data = notification['to']