1) ok 2) this would be the cron.master file. Sadly, it must be a file as otherwise multiprocess setups (like wsgi) would trip over each other. 3) I'm thinking of deprecating posttasks in favor of being able to daisy-chain controllers. So you would not have posttasks, but you could specify a controller that would be called automatically after the current controller is finished. That would be a lot cleaner but would keep the functionality.
On Feb 8, 4:25 pm, mdipierro <mdipie...@cs.depaul.edu> wrote: > I agree that Popen is a better solution and I would not change > anything in cron.py. > > I would only like: > 1) move crontype into gluon.settings and use the variable to determine > the type of cron. Currently this is a global variable almost useless > to determine which type of cron is on. > 2) add a variable that tells if cron is being executed > 3) remove posttasks since it is misleading (they are executed after > ever action for every app). May not be thread safe. > > On Feb 8, 7:40 am, AchipA <attila.cs...@gmail.com> wrote: > > > Fiddling with this now, but have a few concerns, so I'd like Massimo > > to chime is as the exec expert. The main reason for going POpen is to > > have a clean, thread safe environment, and with exec I'm not sure we > > won't hit race conditions or deadlock possibilities, especially if we > > touch on models. Some help how to exec stuff with the proper > > environment would be welcome :) > > > Another thing to note is that when execing, we no longer have control > > over what we execute - i.e. while we can kill/clean zombie POpened > > processes, if we get stuck in just another thread (=with exec) it's > > stuck there until the whole web2py/webserver is restarted. > > > On Jan 31, 7:27 am, John Heenan <johnmhee...@gmail.com> wrote: > > > > I have not get my point across. > > > > By 'Python exec' I mean using the 'exec' internal Python command. I > > > don't mean 'Python exec' as a shorthand for 'execute a new Unix, > > > Windows or Mac OS process under the ownership of the cron code written > > > in Python'. > > > > I have just examined the most recent trunk version of cron.py > > > inhttp://code.google.com/p/web2py/source/browse/gluon/contrib/cron.py > > > > For .py files the Popen command is still executed using the > > > cronlauncher class that uses Popen > > > > For those of us trying ot keep RAM usage down, who don't want to use a > > > regular crontab and who only want to run Python files, using Popen is > > > not necessasry. > > > > My point is can we have an option to: > > > > 1) Just do an Python exec on an opened file contents (with ot without > > > the models envrionment), instead of doing a Popen > > > 2) Have an option to do an Python exec on a string, such as on "import > > > a; a.mycronaction()" > > > > Thanks > > > > John Heenan > > > > On Jan 31, 2:17 pm, mdipierro <mdipie...@cs.depaul.edu> wrote: > > > > > Unless we misunderstand we have that already. The file just needs to > > > > end in .py as in > > > > > * * * * * root myscript.py > > > > > You can also call actions > > > > > * * * * * root *myscript.py > > > > > so that models are imported. > > > > > On Jan 30, 8:36 pm, John Heenan <johnmhee...@gmail.com> wrote: > > > > > > Hi AchipA > > > > > > Another feature request, if the cron file is a python file, how about > > > > > a cron option to open the file and do an exec on the file contents? > > > > > > Thanks > > > > > > John Heenan > > > > > > On Jan 31, 12:33 pm, John Heenan <johnmhee...@gmail.com> wrote: > > > > > > > Hi AchipA > > > > > > > Your cron is nice work and neatly deals with the messy side of > > > > > > launching an independent OS process and waiting for it to finish. > > > > > > > For those of us who do not wish to launch an independent process (to > > > > > > keep down memory use) and are happy to stick with Python for cron > > > > > > jobs, following is a request to add in the following feature to your > > > > > > cron fpr web2py. > > > > > > > Provide a mechanism to just perform a Python exec on a string > > > > > > statment. > > > > > > > For example a string statement might be > > > > > > "import a; a.mycronaction()" > > > > > > > Thanks > > > > > > > John Heenan > > > > > > > On Jan 31, 6:52 am, AchipA <attila.cs...@gmail.com> wrote: > > > > > > > > Just to chime in, I'm still alive and preparing an update to cron > > > > > > > as > > > > > > > quite a few things changed since I last touched it. As for the > > > > > > > questions - all cron modes support the * and ** syntax, and yes, > > > > > > > cron > > > > > > > files can be modified on the fly. > > > > > > > > On Jan 26, 4:00 pm, mdipierro <mdipie...@cs.depaul.edu> wrote: > > > > > > > > > I did not write cron personally and I am still trying to > > > > > > > > understand > > > > > > > > some of it, Attila did. > > > > > > > > I am in the looking at cron these days to treamline it a bit > > > > > > > > and I am > > > > > > > > trying to understand better as it works. > > > > > > > > > Since windows does not have cron, you should use web2py > > > > > > > > hardcron. It > > > > > > > > should work on windows 7 but I have not tried it. The "root" is > > > > > > > > the > > > > > > > > username that should run the cron task. It is only used by > > > > > > > > extcron and > > > > > > > > ignored otherwise (but must be there, for compatibility of > > > > > > > > syntax). > > > > > > > > > I am not sure if tasks staring with * or ** run under extcron > > > > > > > > so I > > > > > > > > suggest not using pycron. Given hardcron you do not need pycron > > > > > > > > anyway. > > > > > > > > > Mind that this is in the process of being refactored a bit. > > > > > > > > Perhaps > > > > > > > > you can help with testing and debugging so you can be sure it > > > > > > > > works as > > > > > > > > you need it. > > > > > > > > > On Jan 26, 4:27 am, Oguz Yarimtepe <oguzyarimt...@gmail.com> > > > > > > > > wrote: > > > > > > > > > > Hi, > > > > > > > > > > I was trying to use the cron property of web2py at my > > > > > > > > > project. I am > > > > > > > > > using web2py under windows 7. I had installed wamp server > > > > > > > > > with mod_wsgi. > > > > > > > > > According to the documentation it is suggested to use the > > > > > > > > > external cron. > > > > > > > > > I tried to test the soft cron issue so i added the below line > > > > > > > > > to my > > > > > > > > > application crontab > > > > > > > > > > #crontab > > > > > > > > > */2 * * * * root *decrease/ > > > > > > > > > > and at the controllers directory the decrease file is as is > > > > > > > > > > # coding: utf8 > > > > > > > > > > def index(): > > > > > > > > > > f=file("C:\\Users\\oguz\\hede.txt", "w+") > > > > > > > > > f.write("ok") > > > > > > > > > f.close() > > > > > > > > > > return dict() > > > > > > > > > > So when the application is loaded shouldn't i see the txt is > > > > > > > > > created at > > > > > > > > > every 2 minutes? > > > > > > > > > > What is the usage of the root keyword at the crontab file? > > > > > > > > > For windows > > > > > > > > > application what should it be? > > > > > > > > > > And if i want to use the external cron method, it says i > > > > > > > > > should add a > > > > > > > > > line to system cron file. This doesn't sound me so effective > > > > > > > > > at my > > > > > > > > > application so i will be prefering to use something like > > > > > > > > > pycron. Anybody > > > > > > > > > tested these things at windows 7? > > -- You received this message because you are subscribed to the Google Groups "web2py-users" group. To post to this group, send email to web...@googlegroups.com. To unsubscribe from this group, send email to web2py+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/web2py?hl=en.
