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import random
import time
body = u'''
onactivate = (e) => e.waitUntil(clients.claim());
var resolve_wait_until;
var wait_until = new Promise(resolve => {
resolve_wait_until = resolve;
});
onmessage = (e) => {
if (e.data == 'wait')
e.waitUntil(wait_until);
if (e.data == 'go')
resolve_wait_until();
};'''
def main(request, response):
headers = [(b'Cache-Control', b'no-cache, must-revalidate'),
(b'Pragma', b'no-cache'),
(b'Content-Type', b'application/javascript')]
skipWaiting = u''
if b'skip-waiting' in request.GET:
skipWaiting = u'skipWaiting();'
return headers, u'/* %s %s */ %s %s' % (time.time(), random.random(), skipWaiting, body)