Unless you’re running your camping app as a CGI script, the ruby instance keeps
running, so you could just create a looping thread to do it every now and then:
hours = 2 # cleanup every two hours
Thread.new do
loop do
# some database cleanup stuff
sleep hours * 60 * 60
end
end
The only trouble with that is you’d have it happening multiple times if you run
multiple ruby servers behind a proxy like nginx, which is a pretty common
configuration. Probably cron is the best way to go if you can easily do that.
Otherwise you could attach it to some other event - like you could spawn a
thread whenever a user logs in, which cleans up the sessions. If you wanted it
to happen less frequently you could use rand() to generate a random number,
then, say, cleanup if rand < 0.01 if you only wanted to cleanup sessions every
1 out of 100 times someone logs in, roughly. That’s a stratergy people use a
lot with systems like PHP where cron can be difficult to setup and access.
I wouldn’t worry about it too much though. Your sessions will probably still be
quite small (only a couple dozen kilobytes, right?) so you can probably just
let them build up and then every six months or year or so go and delete all the
database records that are more than a week old in that table. Storage is so
cheap these days!
—
Bluebie
On Tuesday, 10 December 2013 at 9:29 pm, Francois Sery wrote:
> Bonjour,
> Thanks for your help. Here is how i've modified my app.
> now i have
> - a 'session' model
> - a "sessions" table with a column for my data...
> - a session cookie: @state[:sessionid]=SecureRandom.hex
> It works as wanted but i have one more question.
>
> how do you handle all the obsolete sessions in the database ? my code
> already delete some sessions. but some other sessions can't be deleted from
> the "flow" of my app. What are the available solutions? cron ? or something
> else maybe?
>
> Merci.
>
>
>
>
> 2013/12/7 Bluebie <a...@creativepony.com (mailto:a...@creativepony.com)>
> > If you fill the session cookie with 4kb of data, that means every http
> > request after that to that domain will require the user to upload 4kb of
> > data, which may not seem like much, but on a mobile phone for instance,
> > loading a page with 50 images, that becomes 4*50 = 200kb - pretty
> > significant considering most home internet connections do not have very
> > fast upload in many countries. On my own internet on a good day that’s at
> > least 2 seconds of uploading.
> >
> > So it is best to use session cookies only to store a very small identifier,
> > then store more information in a local database or file. If you have a look
> > in the rack project you’ll see some other session handlers which do exactly
> > this, so you can keep writing data in to the ‘session’ but have it stored
> > locally, with only a small cookie with an ID number to lookup the local
> > data stored in to the browser.
> >
> > —
> > Bluebie
> >
> >
> > On Saturday, 7 December 2013 at 8:27 am, Charles McKnight wrote:
> >
> > > Sure wish the W3C would devise a better state mechanism than cookies...
> > >
> > > On Dec 6, 2013, at 12:49 PM, Magnus Holm <judo...@gmail.com
> > > (mailto:judo...@gmail.com)> wrote:
> > >
> > > > You should not store a large amount of data in the session. The
> > > > session is stored in a cookie, and everything you store there has to
> > > > be sent back and forth over the network. You can however store an ID
> > > > in the session and lookup data in your database.
> > > >
> > > > // Magnus Holm
> > > >
> > > >
> > > > On Tue, Dec 3, 2013 at 12:04 PM, Francois Sery <sery.franc...@gmail.com
> > > > (mailto:sery.franc...@gmail.com)> wrote:
> > > > > hi , i need some advices.
> > > > > I a little Camping app i have to store a cart in a session . i tried
> > > > > achieving it using the default camping/session but it is limited to
> > > > > 4K and
> > > > > my card miss some data.
> > > > > how can store more than 4k in a session ? thanks.
> > > > >
> > > > > _______________________________________________
> > > > > Camping-list mailing list
> > > > > Camping-list@rubyforge.org (mailto:Camping-list@rubyforge.org)
> > > > > http://rubyforge.org/mailman/listinfo/camping-list
> > > > >
> > > >
> > > > _______________________________________________
> > > > Camping-list mailing list
> > > > Camping-list@rubyforge.org (mailto:Camping-list@rubyforge.org)
> > > > http://rubyforge.org/mailman/listinfo/camping-list
> > > >
> > >
> > >
> > > "The game's afoot. Follow your spirit, and upon this charge, cry God for
> > > Harry, England, and St. George." --- Sherlock Holmes
> > >
> > > _______________________________________________
> > > Camping-list mailing list
> > > Camping-list@rubyforge.org (mailto:Camping-list@rubyforge.org)
> > > http://rubyforge.org/mailman/listinfo/camping-list
> > >
> > >
> > >
> >
> >
> >
> > _______________________________________________
> > Camping-list mailing list
> > Camping-list@rubyforge.org (mailto:Camping-list@rubyforge.org)
> > http://rubyforge.org/mailman/listinfo/camping-list
>
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>
>
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