Sorry for being picky on this. I think the database is not a suitable
place either to store a 'application instance initialized flag'.
Reason:
1) the db can be used by more than one instance of the app
2) if the app stops execution without setting back the 'db record' to
'app not initialized' - like it happens when you remove the power -
then the application will not work any more because the code will
refer to objects which are not created yet because the one-time-
initialization per app was not executed.
I'm not aware how application wide vars in web2py cache are working,
but I assume it could be a viable option.
what do you think?
On Jun 8, 2:43 pm, mdipierro <mdipie...@cs.depaul.edu> wrote:
> You are right. Not in session. You can store an application wide var
> in cache but I would suggest using the db for this. Anyway, I will
> post an example.
>
> On Jun 8, 4:27 am, Hans <johann.scheibelho...@easytouch-edv.com>
> wrote:
>
> > The log file initialization code must be executed once when the
> > application starts and should not be executed multiple times (e.g. not
> > once per user and not once per controller execution).
>
> > I'm not aware that in a session I can store a application-wide global
> > variable - independent of the user.
>
> > Can you provide a link or example code for execution only once per
> > application (e.g. initialization function) ?
>
> > On Jun 5, 10:19 pm, mdipierro <mdipie...@cs.depaul.edu> wrote:
>
> > > can you store it into a session?
>
> > > On Jun 5, 2:11 pm, Hans <johann.scheibelho...@easytouch-edv.com>
> > > wrote:
>
> > > > The problem I have with my code for generating log files that the part
> > > > of the code (see first posting in this thread) which is outside any
> > > > function in the controller (because it should be available for all
> > > > functions in this controller) is executed every time a function is
> > > > called. I have not found a way to execute it only once intitially and
> > > > prevent multiple executions. Hence it registeres log handlers every
> > > > time the controller is executed which causes every log line to be
> > > > written multiple times into the log file.
>
> > > > The following did not work:
>
> > > > try:
> > > > done_once
> > > > except:
> > > > place code to be executed only once here
> > > > global done_once
> > > > done_once=true
>
> > > > because the variable done_once is undefined each time the controller
> > > > is executed again.
>
> > > > How can a code in the controller be executed only once?
> > > > Also completely different approach suggestions are welcome!
>
> > > > Thanks,
> > > > Hans
> > > > On Jun 5, 4:36 pm, mdipierro <mdipie...@cs.depaul.edu> wrote:
>
> > > > > Sorry Hans, I still do not understand the problem.
>
> > > > > code outside function is executed when a function in the controller is
> > > > > called (whatever the function) code in the function is executed only
> > > > > when that function is called. A call to redirect causes the browser to
> > > > > make another request thus the controller is executed again.
>
> > > > > Massimo
>
> > > > > On Jun 5, 8:08 am, Hans <johann.scheibelho...@easytouch-edv.com>
> > > > > wrote:
>
> > > > > > Correction: redirect() usage is NOT causing the problem. Every call
> > > > > > of
> > > > > > a controller function also executes
> > > > > > 1) general parts of the model (db.py)
> > > > > > 2) general parts of the controller (default.py)
> > > > > > 3) the requested function in controller
>
> > > > > > In my case every click to an menu function adds another multiple for
> > > > > > log entries.
>
> > > > > > Thinking about the response.menu example which gives you different
> > > > > > menu options depending on the user being logged in or not I'm
> > > > > > convinced that the general controller sections are executed before
> > > > > > each requested function. That's good for the dynamically changing
> > > > > > menu
> > > > > > and other needs.
>
> > > > > > For a log file function which should be available for the entire
> > > > > > controller I need to make sure its executed only once. Is there a
> > > > > > simple way to do that or a different way to achieve a log file
> > > > > > function (similar like my example up in this thread) available for
> > > > > > the
> > > > > > entire controller?
>
> > > > > > Thanks,
> > > > > > Hans
> > > > > > On Jun 5, 2:34 pm, Hans <johann.scheibelho...@easytouch-edv.com>
> > > > > > wrote:
>
> > > > > > > yes confirmed, the controller is called multiple times. the
> > > > > > > reason I
> > > > > > > found is that the redirect() statements I use cause this. every
> > > > > > > redirect() seems to call the controller, not only the redirection
> > > > > > > target function.
>
> > > > > > > for example my index is mainly a redirect function, based on
> > > > > > > settings
> > > > > > > its for instance doing
> > > > > > > redirect(URL(r=request,f='f1'))
>
> > > > > > > then also in other functions I use redirects e.g. based on rights/
> > > > > > > settings.
>
> > > > > > > I'm using 1.63.5 on WinXP SP3.
>
> > > > > > > Is there a better function than redirect() for avoiding to call
> > > > > > > the
> > > > > > > general controller stuff multiple times?
> > > > > > > Is redirect() supposed to also call the general controller stuff
> > > > > > > or
> > > > > > > only directly the redirection target function ?
>
> > > > > > > Thanks,
> > > > > > > Hans
> > > > > > > On Jun 4, 10:48 pm, mdipierro <mdipie...@cs.depaul.edu> wrote:
>
> > > > > > > > Odd I think your controller is being called 3 times. Is that
> > > > > > > > possible?
> > > > > > > > I would add a print statement to check.
>
> > > > > > > > On Jun 4, 2:29 pm, Hans <johann.scheibelho...@easytouch-edv.com>
> > > > > > > > wrote:
>
> > > > > > > > > I tried to define a global logging for a web2py app. The
> > > > > > > > > problem with
> > > > > > > > > that is that if I place the following code in my default.py
> > > > > > > > > controller
> > > > > > > > > or db.py model then in both cases its executed more than
> > > > > > > > > once...resulting into having every log line written multiple
> > > > > > > > > times
> > > > > > > > > into the log file.
>
> > > > > > > > > either starting the default.py or db.py with those lines is
> > > > > > > > > yielding
> > > > > > > > > the same result
> > > > > > > > > import logging, logging.handlers
>
> > > > > > > > > # Make a global logging object.
> > > > > > > > > lox = logging.getLogger("log")
> > > > > > > > > lox.setLevel(logging.DEBUG)
>
> > > > > > > > > # This handler writes everything to a file.
> > > > > > > > > h1 = logging.FileHandler("/var/log/myapp.log")
> > > > > > > > > f = logging.Formatter("%(levelname)s %(asctime)s
> > > > > > > > > %(funcName)s %
> > > > > > > > > (lineno)d %(message)s")
> > > > > > > > > h1.setFormatter(f)
> > > > > > > > > h1.setLevel(logging.DEBUG)
> > > > > > > > > lox.addHandler(h1)
>
> > > > > > > > > # This handler emails me anything that is an error or
> > > > > > > > > worse.
> > > > > > > > > h2 = logging.handlers.SMTPHandler('localhost',
> > > > > > > > > '....@test.com',
> > > > > > > > > ['tobenotif...@test.com'], 'ERROR log')
> > > > > > > > > h2.setLevel(logging.ERROR)
> > > > > > > > > h2.setFormatter(f)
> > > > > > > > > lox.addHandler(h2)
>
> > > > > > > > > log usage example in controller...
> > > > > > > > > def index():
> > > > > > > > > log = logging.getLogger("log")
> > > > > > > > > log.debug("starting...")
> > > > > > > > > ....do something
> > > > > > > > > log.debug("finishing...")
> > > > > > > > > return()
>
> > > > > > > > > log file looks like:
> > > > > > > > > DEBUG 2009-06-04 20:27:45,617 index 1 starting...
> > > > > > > > > DEBUG 2009-06-04 20:27:45,617 index 1 starting...
> > > > > > > > > DEBUG 2009-06-04 20:27:45,617 index 1 starting...
> > > > > > > > > DEBUG 2009-06-04 20:27:50,617 index 1 finishing...
> > > > > > > > > DEBUG 2009-06-04 20:27:50,617 index 1 finishing...
> > > > > > > > > DEBUG 2009-06-04 20:27:50,617 index 1 finishing...
>
> > > > > > > > > how can I fix the 'multiple problem' ?
>
>
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