def dispatch(self, *args, **kwargs):
"""Do setup for cron handlers.
- Jsons output
- logs exception traces
- Initializes Api-like Cron object
"""
# There's no true sense of a current user making a request in cron
# jobs, so invent an admin to run them. Don't get whether they've ever
# been created before in unique index of users, because crons run all
# the time. The user won't be saved to the datastore anyway.
admin_user = User.create(check_uniqueness=False,
email='',
auth_id='',
first_name='Cron',
last_name='Job',
is_admin=True)
# The testing flag allows us to use unsaved user entities to create an
# api. Normal operation requires that the user be saved to the
# datastore. This is the only effect; e.g. a testing api still affects
# the datastore.
self.api = Api(admin_user, testing=True)
self.cron = Cron(self.api)
self.response.headers['Content-Type'] = (
'application/json; charset=utf-8')
try:
# Call the descendant handler.
BaseHandler.dispatch(self)
# self.write_json(self.do(*args, **kwargs))
except Exception as error:
trace = traceback.format_exc()
logging.error("{}\n{}".format(error, trace))
response = {
'error': True,
'message': '{}: {}'.format(error.__class__.__name__, error),
'trace': trace,
}
self.response.write(json.dumps(response))
else:
# If everything about the request worked out, but no data was
# returned, put out a standard empty response.
if not self.response.body:
self.write(None)
def dispatch(self):
try:
logging.info("ViewHandler.dispatch()")
# Call the overridden dispatch(), which has the effect of running
# the get() or post() etc. of the inheriting class.
BaseHandler.dispatch(self)
except Exception as error:
trace = traceback.format_exc()
# We don't want to tell the public about our exception messages.
# Just provide the exception type to the client, but log the full
# details on the server.
logging.error("{}\n{}".format(error, trace))
response = {
'success': False,
'message': error.__class__.__name__,
}
if debug:
self.response.write('<pre>{}</pre>'.format(
traceback.format_exc()))
else:
self.response.write("We are having technical difficulties.")
return
def dispatch(self, *args, **kwargs):
"""Wrap all api calls in a try/catch so the server never breaks when
the client hits an api URL."""
self.response.headers['Content-Type'] = (
'application/json; charset=utf-8')
# https://stackoverflow.com/questions/45643161/how-to-return-status-code-418-in-webapp2
webob_util.status_reasons[429] = "Too Many Requests"
httplib.responses[429] = "Too Many Requests"
try:
# Call the descendant handler.
# super(ApiHandler, self).dispatch()
BaseHandler.dispatch(self)
except Exception as error:
trace = traceback.format_exc()
# We don't want to tell the public about our exception messages.
# Just provide the exception type to the client, but log the full
# details on the server.
logging.error("{}\n{}".format(error, trace))
response = {
'error': True,
'message': error.__class__.__name__,
}
if debug:
response['message'] = "{}: {}".format(error.__class__.__name__,
error)
response['trace'] = trace
self.response.write(json.dumps(response))
else:
# If everything about the request worked out, but no data was
# returned, put out a standard empty response.
if not self.response.body:
self.write(None)
