Porting Basic Script on Google App Engine

Question

I came across google app engine a week ago and wanted to play around with it a bit. I wrote a dummy application which checks a url and based on the return code it logs to a file if the site is "up" or "down"

I wanted to deploy it on to app engine and schedule cron jobs ( for example every one minute). I came across this example. I complete understand the app.yaml file but I am not sure about the 'url' int he cron.yaml file. WHat it is purpose? can it be skipped in the file?

Morover the example uses the webapp2 module. Do I wrap my code in that module?

Code given below:

import requests
import logging

logger = logging.getLogger('testapp')
hdlr = logging.FileHandler('/Users/me/Desktop/testlog.log')
formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s')
hdlr.setFormatter(formatter)
logger.addHandler(hdlr) 
logger.setLevel(logging.INFO)

try:
    r = requests.head("http://www.redcafe.com")
    code = (r.status_code)
except requests.ConnectionError:
    logger.error('URL Error')

if code == 200:
    logger.info('Up and running')
else:
    logger.error('Cant find website')

Community · Accepted Answer · 2017-05-23 11:44:26Z

According to the cron.yaml doc:

The url field specifies a URL in your application that will be invoked by the Cron Service.

Basically your app will register a handler for that URL which will be invoked when the GAE cron service requests it.

You probably want to spend some time getting familiar at least with:

the GAE python runtime constraints (you can't directly write to a file, for example)
cron/scheduled tasks in GAE
the GAE python tutorial which explains how webapp2 fits into the picture

Using the requests library in GAE may be tricky: Can Python Requests library be used on Google App Engine? You may want to take a look at the GAE sockets or URL fetch services as alternatives.

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