Archive for the ‘PHP’ Category

The next steps for Phorum

Now that Phorum-5.2 has finally gone stable there will be hopefully some better modules as the possibilities have been vastly increased. One of the new modules for 5.2 which show quite some of the abilities is the rewritten user-avatar module for 5.2.
With modules you can use now (not everything is new in 5.2!!!):

  • use a supported API for files, users, custom profile fields and similar stuff
  • ability to hook the module-css into the css loaded by phorum for valid (x)html pages and not loading it separately (saving requests)
  • ability to hook the module-javascript into the javascript loaded by phorum for … see above 😉
    (both can use raw files, templates, functions for including it)
  • can do database calls without writing database dependent code (could still be because of the queries themselves)
  • use module-templates which are included in the module itself, no need to copy them to the template folder(s)
  • language files in the modules themselfes
  • adding controlcenter panels without copying files around

Also our module list for 5.2 is now auto-generated from the modules posted into the 5.2-modules forum in the right format.
Make sure to add categories too as listed in the docs!

So, now that we (could) have better modules, whats next?

Dan Langille has been working on a postgresql-layer for 5.2/5.3 which will probably be included in one of the later 5.2 release as a beta of this layer.
The next big release will be Phorum-5.3. Our plan for Phorum-5.3 is “just” to add even more APIs, changing large parts of the backend without touching much of the frontend code.
Therefore templates from 5.2 should work without a hitch with 5.3. Maybe there will be added features missing in the old template but otherwise it will continue to work as before.
I know we made it hard for some admins with the switch from 5.0 to 5.1 and 5.1 to 5.2 but all these changes were done for flexibility in the templates and making them far more consistent and therefore easier to implement.
Some of the APIs will be about forum handling and similar stuff so that you can build a new admin or an admin in another page far easier than before.
As usual you can see the tickets on the table for 5.3 in our ticket-list (from the 5.3-milestone).

And further in the future?
There is lots and lots of stuff in the ever growing Ideas-milestone.
We’ll see if any of this will see the light in 5.3 already or in a later release but we surely won’t get bored ;-).
I’m pretty sure that lots of stuff will be done at the MySQL Conference 2008 like last year where we’ve been coding and presenting there with lots of feature tickets closed for 5.2. You can help us to get there with donating to phorum.org!

Advertisements

building a HA/LB solution

I’m currently in the process of trying to build a HA/LB solution for my forums.
Currently HA (HighAvailability) is created by running heartbeat on the two webserver-“nodes” with automatic ip-takeover and a mysql-slave which gets all the data from the main-db-server (but needs manual takeover).
LB (LoadBalancing) is done with FastCGI-Loadbalancing in LiteSpeed-Webserver but I’m not satisfied with the results as it seems that the first host is getting much more load than the second one.

Therefore I played with some Virtual Machines, one running haproxy ( http://haproxy.1wt.eu/ ), two running lighttpd with fcgi-php.
So far it worked good but taking down one of the webservers still gave me some failed requests if it was running under “siege”. Thats something I wanted to avoid.
Lighttpd was simply choosen because of mod_extforward so that I could keep the original hosts ip in the REMOTE_ADDR and its support for fcgi-php.

But as I wrote in an earlier post there is one feature I’d badly miss in lighttpd and which really keeps me from switching:
.htaccess-support or generally spoken: dynamic configuration changes without changing the main-configuration and the need for a webserver reload.
I found one thread in the lighttpd-forums which sounds promising.
Reading dynamic configuration from mysql is something I’d love to see. It would kick ass :).
Yeah, sure. Lighttpd would have to work without mysql-connection too, some fallback mechanism needs to be in place but that would solve at least most of my problems.
For my own DoS functionality I need a way to block connections on the webserver-level before it even reaches PHP.

So there are some problems or lets better call it “tasks” left to solve for my HA/LB solution:
– find the right webserver to implement that
– build a solution to merge the logs and process them for statistics
– find out how to get haproxy (or another loadbalancing solution) to send failed requests to another backend in case of one going down

And the big task:
– find some automatic solution for mysql-takeover (without DRBD, which I don’t trust because of its network-based nature ;))
Any ideas anyone?

The DateTime object is “the next big thing”?

We’ve (the folks from Phorum) been talking in the last days about using the new DateTime object in PHP for Phorum as it has a nice way to use timezones including their DST setting.
Up to now we have just a setting where the user select if DST is current active or not as there isn’t really an easy way for use to enable/disable DST automatically.
Using that object would allow us to let the user select its timezone (with the timezone-select generated from that DateTime Object) and have DST automatically adjusted or better, we would not have to care about DST once a timezone is selected as its done automatically.

But unfortunately there is no localization of the date/time formats names in that new object.
Derick tells that “It’s intentional for PHP 5.2, not for PHP 6.0.” which is not really satisfying in my opinion.
In Phorum we are using strftime which formats time and date by the locale settings which are done through our language-files too.
So we can’t really get this behaviour through the new DateTime stuff and therefore I can’t really agree with Brian that its the feature we want in Phorum and that would require PHP-5.2.
It would only work half-way, too bad. A good idea which wasn’t completely finished.

Charset hell (and mysql-upgrades)

Oh yeah, some people will remember me talking about charset hell when it wasn’t really that bad (yet).
But in the near future I will surely have to solve some charset problems for MySnip.de.
It is still running MySQL-4.0.x which didn’t support charsets like MySQL-4.1 did and even more MySQL-5 is doing now.
But as MySQL-4.0 support has run out I really need to upgrade soon and then I’ll probably find myself in a lot of charset troubles ;).
First one will start with the upgrade itself. How will it look like after the upgrade? Default charset will probably be latin1 so it *should* be fine. But will it?
Beside that this upgrade is already some trouble as I will need to dump/restore the whole databases which are quite some GB’s and I hate to take the services down for some hours.

For now I’m finding enough excuses like I need to wait for Phorum-5.2 until I can upgrade but in the end I can’t do it all at once.
I still hope that Phorum-5.2 will still run on MySQL4 so that I can upgrade Phorum first and then convert to MySQL5 (for now I see no problems with that).
But Brian has announced that he doesn’t care about PHP4 and MySQL4 either as we are all developing on MySQL5 and PHP5.2 (which is correct, my development environment is like that too) – we’ll see what I can do about it ;).

Seems like I’m running a really explosive mixture with PHP4.4.x, MySQL4.0.x on my production boxes and doing development mostly on PHP-5.2.x and MySQL5.0.x.
Fortunately it seems like Phorum itself is not as vulnerable to changes in PHP itself as other apps because of its NON-OO-code and up to now we had always MySQL4 in mind as it was the requirement for Phorum-5.1 which is the current stable version.

Somewhen I’ll run into walls, thats for sure …