Log file usage in Web2py is now simpler than ever!
You want to monitor the activities of your cron-driven web2py
functions?
To use the per application log file with rotating file handler in
web2py you need to put log.py (below) into your models folder. The log
file itself is created in your_web2py_path/applications/
your_application/app.log
Writing into the log file from your controller works as follows:
def my_function():
logging.debug('my function abc is starting')
logging.error('huston we got a %s problem.' % 'major')
return ()
Viewing the log file through your application works as follows:
def show_log():
return get_log()
If required the GAE solution needs work.
A BIG thank you to Iceberg!
Feedback and usage is welcome ;-)
Hans
Here is the log.py model version I use to enable logging for web2py
apps.
import logging
def _init_log(level=logging.DEBUG,formatter="%(asctime)s %(levelname)s
%(funcName)s():%(lineno)d %(message)
s",filename='app.log',maxBytes=1024*1024,backupCount=2):
import os,logging.handlers
logger=logging.getLogger(request.application)
logger.setLevel(level)
if request.env.web2py_runtime_gae: # if running on Google App
Engine
handler=logging.handlers.HTTPHandler(request.env.http_host,URL
(r=request,f='log')) # assuming there is an optional log action
else:
handler=logging.handlers.RotatingFileHandler(os.path.join
(request.folder,filename),maxBytes=maxBytes,backupCount=backupCount)
handler.setLevel(level)
handler.setFormatter(logging.Formatter(formatter))
logger.addHandler(handler)
logger.debug("web2py application %s starting" %
request.application)
return logger
def get_log():
try:
f = open(logging.handlers[0].baseFilename, 'r')
c = f.readlines()
f.close()
return {'log':TABLE(*[TR(str(item)) for item in c])}
except:
return ()
logging=cache.ram('mylog',lambda:_init_log(),time_expire=99999999)
On Jun 11, 10:20 am, Iceberg <iceb...@21cn.com> wrote:
> Not at all.
>
> The cache.ram in log.py is to make sure the logger is inited only
> once, otherwise we will see more and more duplicate log appearing in
> the log file as Hans mentioned in his earlier posts. The only downside
> is that you need to restart web2py if you change (but usually you
> don't need to) log definition.
>
> As to the "OPTIONAL in controller" part, you can ignore it. They are
> just a rough demo and not necessary.
>
> On Jun11, 3:17am, mdipierro <mdipie...@cs.depaul.edu> wrote:
>
> > Why do you need to cache the logging module? Is this only for speed?
>
> > On Jun 10, 1:44 pm, Iceberg <iceb...@21cn.com> wrote:
>
> > > After changing from FileHandler to RotatingFileHandler, now I think
> > > the per-app log can be turned on by default (otherwise new comers
> > > won't notice this good feature).
>
> > > The only thing I am still not sure is whether one can use logging and
> > > its FileHander (or RotatingFileHander) on GAE's readonly filesystem.
> > > Tests are welcome.
>
> > > Anyway, this is my latest code. Maybe it can help you.
>
> > > import logging
> > > def _init_log(level=logging.DEBUG):
> > > import os,logging.handlers
> > > logger=logging.getLogger(request.application)
> > > logger.setLevel(level)
> > > if request.env.web2py_runtime_gae: # if running on Google App
> > > Engine
> > > handler=logging.handlers.HTTPHandler(
> > > request.env.http_host,URL(r=request,f='log')) # assuming there
> > > is an optional log action
> > > else:
> > > handler=logging.handlers.RotatingFileHandler(
> > > os.path.join
> > > (request.folder,'app.log'),maxBytes=1024*1024,backupCount=2)
> > > handler.setLevel(level)
> > > handler.setFormatter(logging.Formatter(
> > > "%(asctime)s %(levelname)s %(funcName)s():%(lineno)d %(message)
> > > s"))
> > > logger.addHandler(handler)
> > > return logger
> > > logging=cache.ram('mylog',lambda:_init_log(),time_expire=99999999)
>
> > > OPTIONAL in controller:
>
> > > def log():
> > > if request.vars: # append
> > > history=cache.ram('log_in_cache',lambda:[],time_expire=99999999)
> > > history.append(request.vars)
> > > cache.ram('log_in_cache',lambda h=history:h,time_expire=0)#set
> > > else: # show
> > > return {'':TABLE(*[TR(item) for item in
> > > cache.ram('log_in_cache',lambda:None,time_expire=99999999)])}
>
>
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