Posts tagged Plone

Remove broken portlets programmatically

If you have specific broken portlets that needs to be removed from your Plone site, you will have to reinstall the product that contains your portlets, otherwise you will get this error :

Traceback (innermost last):
Module ZPublisher.Publish, line 126, in publish
Module ZPublisher.mapply, line 77, in mapply
Module ZPublisher.Publish, line 46, in call_object
Module, line 66, in delete_portlet
Module zope.container.ordered, line 243, in __delitem__
Module zope.container.contained, line 647, in uncontained
Module OFS.Uninstalled, line 45, in __getattr__
AttributeError: __parent__

But what if you just can’t find / reinstall the product ?

You could already remove the broken portlet through Plone UI, thanks to packages like collective.braveportletsmanager. Now you will be able to do it without any additional package thanks to this change in

If you want to delete broken portlets programmatically, this is possible by disabling the error raised before your usual portlet removal function (see fixing_up in zope.container.contained) :

from zope.container import contained
contained.fixing_up = True
manager = getUtility(IPortletManager, name=u'plone.leftcolumn', context=portal)
assignments = getMultiAdapter((portal, manager), IPortletAssignmentMapping)
for portlet in assignments:
    del assignments[portlet]
contained.fixing_up = False

We used this in a migration step for a customer.
Enjoy !

Zope – how long does it take to serve a request?

For the moment only a reverse proxy (apache, ngnix) or a browser can show you how long a request took to be processed.

For monitoring or debugging purpose you might want to know what zope instance is slow.

The default access zope log file give you such a log format: - Anonymous [27/Oct/2010:16:44:04 +0100] "GET / HTTP/1.1" 200 1957 "" "Mozilla/5.0 (X11; U; Linux x86_64; fr; rv: Gecko/20101013 Ubuntu/10.10 (maverick) Firefox/3.6.11"

which doesn’t give you any information about how fast zope was to serve that request.

At the moment there is no way to add this number of seconds in the log format of zope 2. Unfortunately the zope http server (ZServer & medusa) cannot be easily overridden or monkey patched.

Here is a patch to apply on your zope 2 buildout to have such a log format: 0.008843 - Anonymous [27/Oct/2010:16:45:41 +0100] "GET / HTTP/1.1" 200 1957 "" "Mozilla/5.0 (X11; U; Linux x86_64; fr; rv: Gecko/20101013 Ubuntu/10.10 (maverick) Firefox/3.6.11"

You see here that it took 0.008843 seconds to compute the page on that zope instance.

Thanks to this number of seconds we have monitoring checks (using Nagios 3) and monitoring graph (using Cacti) of each instances within our zeo’s.

Patch for Zope 2.10

Patch for Zope 2.12

To apply the patch, install omelette in your buildout and run this command in the root of your buildout:

patch -p0 < responsetime-212.diff

It will patch the required methods in ZServer to give you the number of seconds the request took to be processed. A patch might sound (and is) hacky but that’s the easiest way to change such a low level module.

Maybe we should give the possiblility to have this in log format in Zope 2.1 / 2.13 default config ?