I am preparing a web service using django in python. When I start web service, I would like to have a main function to run. However, code below did not work in web service. I want to have an initializer function which will fill the structures defined global. I can achieve it by directly defining an init function and call it end of the module but I don't know whether this is the proper way of doing so.
if __name__ == '__main__':
main()
Here similar question was posted. As I understand there is no clear solution for that and I find my way to do this. I defined a dummy function in web service module like:
def warmup(request):
response = HttpResponse()
response.write("ok")
return response
We start application with command sudo python manage.py runserver 0.0.0.0:8081 so I add a piece of code in manage.py such that:
#!/usr/bin/env python
import os
import sys
import requests
import threading
import time
def warmup_request():
print "warmup.."
time.sleep(1)
try:
r = requests.get("http://localhost:8081/warmup/")
if r.content == "ok":
return
except Exception, e:
pass
threading.Timer(0,warmup_request).start()
if __name__ == "__main__":
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "mysite.settings")
from django.core.management import execute_from_command_line
warmup_request()
execute_from_command_line(sys.argv)
If warmup service API returns ok it means loading initial data process has finished. By defining a global flag, we can block all other service API requests before warming up has finished. Or instead defining global flag we may use request_started signal stated here to block all incoming requests with more little effort.
