After a whole day of struggling I came to the conclusion that this is more
of a design flaw than a bug :
Appadmin is designed to check credentials with another application (admin).
The default behaviour of the credential checking system does not allow any
modification and has to be done with gluon/fileutils.py (i.e. a file-based
session management of the 'admin' application).
The only exception is Google App Engine (it is written in the code with a
big 'if' statement) which uses Google's SDK.
I think it is a shame that the implementation of GAE in web2py is so
restrictive : it would be so much better if the code was written to be more
open to other cloud services. Many services are emerging these days (e.g. :
http://www.paasify.it/vendors) and Google is not necessarily the best
answer for everyone. At least it is not the only answer that's for sure.
On the whole "session management" subject : I think it is an interesting
idea to be able to check for credentials through applications but as we
allow sessions to be stored in a database for any application, 'admin'
should also be able to manage sessions in a database... with all
corresponding functions that are currently file-based (e.g. appadmin.py).
[tl;dr]
So far the only solution to my issue was to :
1. Remove appadmin.py from my app
2. Disable 'admin' application
3. Rewrite gluon/contrib/heroku.py (I put my current file attached to
this reply)
Now basically if you use the "detect_heroku" function then you can apply
"session.connect(...)" in your model with no risk of sessions being lost no
matter how many dynos you deploy on heroku.
That's the best solution I found so far, although far from perfect.
On Wednesday, November 26, 2014 4:15:50 PM UTC+1, Anthony wrote:
>
> On Wednesday, November 26, 2014 8:34:58 AM UTC-5, Louis Amon wrote:
>>
>> I can’t find any documentation about settings.cfg.
>>
>> How does it work ? Where is it loaded ? Is it application-specific ?
>>
>
> settings.cfg is in /web2py/applications/admin/ and is specific to the
> admin app. Currently it only holds editor settings and is only read in when
> editing. I suppose we could add a setting to specify where to store
> sessions.
>
> Anthony
>
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"""
Usage: in web2py models/db.py
from gluon.contrib.heroku import get_db
db = get_db()
"""
import os
from gluon import *
from gluon.dal import ADAPTERS, UseDatabaseStoredFile,PostgreSQLAdapter
detect_heroku = lambda: bool([n for n in os.environ.keys() if n[:18]+n[-4:]=='HEROKU_POSTGRESQL__URL'])
class HerokuPostgresAdapter(UseDatabaseStoredFile,PostgreSQLAdapter):
drivers = ('psycopg2',)
#uploads_in_blob = True
#ADAPTERS['postgres'] = HerokuPostgresAdapter
def get_db(name = None, pool_size=10):
if not name:
names = [n for n in os.environ.keys()
if n[:18]+n[-4:]=='HEROKU_POSTGRESQL__URL']
if names:
name = names[0]
if name:
db = DAL(os.environ[name], pool_size=pool_size)
current.session.connect(current.request, current.response, db=db)
else:
db = DAL('sqlite://heroku.test.sqlite')
return db
def get_db_uri(name = None):
names = [n for n in os.environ.keys() if n[:18]+n[-4:]=='HEROKU_POSTGRESQL__URL']
if len(names) == 0:
raise RuntimeError('No database available')
if name is None:
name = names[0]
if not name in names:
raise RuntimeError(name + ' is not available')
uri = os.environ[name]
return uri
