Plone classic "initialization code"

sgeulette · May 9, 2022, 7:47am

Hi,
I would like to add "some code" (like not persisted ramcache setting, etc.) when a plone instance has started and is ready.
I tried a subscriber on "zope.processlifetime.IProcessStarting", but it is too early.
Where is the best place to put this code ?
Thanks in advance

gotcha · May 9, 2022, 8:53am

What do you mean by "too early" ?

Did you check zope.processlifetime.IDatabaseOpened ?
or zope.processlifetime.IDatabaseOpenedWithRoot ?

alert · May 9, 2022, 9:08am

This works for me:

github.com

ploneintranet/ploneintranet/blob/8a41740b5b8a4e001b2054cade68f8b420d0f615/src/ploneintranet/themeswitcher/configure.zcml#L60-L62

      
        
            <subscriber for="zope.processlifetime.IProcessStarting"
                        handler=".dbconfig.dbconfig"
                        />

Note that you have to commit your changes!

sgeulette · May 9, 2022, 1:17pm

ramcache = queryUtility(IRAMCache)
ramcache.update(maxEntries=100000, maxAge=2400, cleanupInterval=600)

Does not work because ramcache is yet changed after that.

Tried a time ago but don't remember: I think some plone config (registry ?) wasn't yet loaded...

Other problem, we don't have a plone context.

zope.processlifetime.IDatabaseOpenedWithRoot is notified before IProcessStarting

alert · May 9, 2022, 1:33pm

You might want to pass a context to your getUtility:

github.com

ploneintranet/ploneintranet/blob/8a41740b5b8a4e001b2054cade68f8b420d0f615/src/ploneintranet/themeswitcher/dbconfig.py#L64

      
        
                    'ploneintranet.themeswitcher from buildout.'
                )
                return
            
            
plone = root_folder.get(instance_name)
            if plone is None:
                log.error('No Plone instance with instance_name "%s" found.'
                          % instance_name)
                return
            
            
registry = getUtility(IRegistry, context=plone)
            settings = registry.forInterface(IThemeSwitcherSettings, check=False)
            if conf.get('hostname_switchlist') or conf.get('hostname_default'):
                try:
                    if conf.get('hostname_switchlist'):
                        settings.hostname_switchlist = [
                            unicode(conf.get('hostname_switchlist')), ]
                        log.info('hostname_switchlist configured')
                    if conf.get('hostname_default'):
                        settings.hostname_default = unicode(
                            conf.get('hostname_default'))

Otherwise you could call zope.component.hooks.setSite (I guess it will work as well).

sgeulette · May 11, 2022, 2:36pm

Thanks @alert for your suggestions and the code references.
The ram cache setup is well kept after a commit.
I have added a product-config declaration with the site path.
Other operations work well after a setSite.
Thanks a lot