Hi all,
I want to put a limit on the execution time of page requests, to
protect against some pages that might run large or inefficient
queries. I've looked around the docs and the Configuration Directives
but couldn't find out how to do it that way. I'm running the following
stack:
mod_wsgi 2.8 Apache/2.2.14 Ubuntu 10.04 Python 2.6.5 Linux
my httpd.conf is as follows:
ServerName 127.0.0.1
SetEnv no-gzip
WSGIDaemonProcess myapp processes=1 threads=1 python-path=/var/www/
WSGIProcessGroup myapp
WSGIScriptAlias /myapp /var/www/myapp.wsgi
I have implemented the following solution, and it seems to work but I
wanted to get peoples feedback on whether or not this is the best way
to do this:
this is the contents of /var/www/myapp.wsgi:
import time, os, threading, signal, Queue, cgi
class TimeoutMonitor(threading.Thread):
def __init__(self, timeoutQ, timeout):
threading.Thread.__init__(self)
self.timeoutQ = timeoutQ
self.timeout = timeout
def run(self):
try:
self.timeoutQ.get(timeout=self.timeout)
except Queue.Empty:
os.kill(os.getpid(), signal.SIGKILL)
def application(environ, start_response):
parameters = cgi.parse_qs(environ.get('QUERY_STRING', ''))
start_response('200 OK', [('Content-type', 'text/plain')])
timeoutQ = Queue.Queue()
TimeoutMonitor(timeoutQ, timeout=10).start()
for i in range(int(parameters['sleep'][0])):
time.sleep(1)
yield str(i) + '\n'
yield 'done'
timeoutQ.put('done')
I have a few questions:
- Is there another simpler or better way of doing this? maybe through
some configuration parameter?
- In general is it alright to spawn threads in modwsgi (in daemon
mode)?
- Is it better to send a SIGKILL, SIGTERM, or SIGINT signal?
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