Moving from Python 2 -> 3 and hit snag with webob and JSON serializer, pickle works #431
Comments
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It sounds like you've written a custom serializer and it's not returning bytes. |
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@mmerickel thanks for the rapid call out, here is another snippet: from pyramid.config import Configurator
# Cookie only session, not encrypted but signed to prevent tampering.
from pyramid.session import SignedCookieSessionFactory
from miscutils import get_children_settings
def session_serializer(serializer_name):
if serializer_name == "json":
import json
return json
import pickle
return pickle
def main(global_config, **settings):
"""This function returns a Pyramid WSGI application."""
# setup session factory to use unencrypted but signed cookies
session_settings = get_children_settings(settings, "session")
session_settings["serializer"] = session_serializer(
session_settings.get("serializer")
)
session_factory = SignedCookieSessionFactory(**session_settings)
with Configurator(settings=settings, session_factory=session_factory) as config:
# all of the models for persisting data into our database.
config.include(".models")
# all of the web application routes.
config.include(".routes")
# all of the data we attach to each inbound request.
config.include(".request_methods")
# enable jinja2 templating engine.
config.include(".config_jinja2")
# scan each of these includes for additional configuration.
config.scan()
return config.make_wsgi_app() |
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Thanks, I figured as much. Here is a first pass at making First I created a new file / module which I may import and pass to the session configurator: import json
loads = json.loads
def dumps(obj, *args, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, cls=None, indent=None, separators=None, default=None, sort_keys=False, **kw):
result = json.dumps(obj, *args, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, cls=None, indent=None, separators=None, default=None, sort_keys=False, **kw)
return result.encode("utf-8")and then in my def session_serializer(serializer_name):
if serializer_name == "json":
import make_post_sell.lib.json_session_serializer as json_serializer
return json_serializer
import pickle
return pickleThis appears to work so I will close this issue. Please feel free to comment after closing if my approach is bad. |
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Actually looks like we already have a batteries included solution, see: https://docs.pylonsproject.org/projects/pyramid/en/latest/api/session.html#pyramid.session.JSONSerializer def session_serializer(serializer_name):
if serializer_name == "json":
from pyramid.session import JSONSerializer
return JSONSerializer()
from pyramid.session import PickleSerializer
return PickleSerializer() |
I'm taking the time to try to upgrade some of my Pyramid projects from Python 2.7 to 3.9, things are going well but I hit a snag with
webob, and I'm wondering if it is a defect or something obvious I'm doing wrong.I have a work around by falling back the the pickle serializer so there is no rush but I would prefer to use the JSON serializer for signed cookie based sessions.
Here is a snippet of my code in question and the full traceback.
Thanks again for anything you can do to nudge me in the right direction. This code works in Python 2 with JSON serializer.
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