Redis on Heroku not respond

Question

I'm pretty new to Redis queuing job task. I tried to do some function on the queue by using Redis To Go Add-on. But after I push some task on queue it seems to disappear.

Here is my code

import Flask
import redis
from rq import Queue

REDIS_URL = os.getenv('REDISTOGO_URL', None)
if REDIS_URL!=None:
    r = redis.from_url(REDIS_URL)
else:
    r = redis.Redis()

q = Queue(connection=r)

def function(pam1):
    print("Checkpoint1")
    return 0

@main.route('/name', methods=['GET', 'POST'])
def displayname():
    job = q.enqueue(function, pam1=0)
    return job.id

Additional info on queue: There still give the job id eg.7344337b-cca0-442a-b43a-abcdc88f012c.

but no sign of "Checkpoint1" on heroku log at all.

Answer 1

Thanks to @v25. The real reason that Redis not responds because I don't have a WORKER. After get thu see the Heroku guide on launching a worker now my problem solved.

Answer 2

I'm not sure about Heroku's logging implementation, but assuming you're looking at the wrong log (or something) you could try this...

Instead of printing 'Checkpoint', increment the value of a custom redis key:

def function(pam1):
    r.incr('job_ran', 1)
    return 0

Then create a route where you can check this value:

@app.route('/show_count')
def show_count():
    n = r.get('job_ran')

    if n is None:
        n = 0
    else:
        n = n.decode('utf-8')

    return f'Job has run {n} times'

Now enqueue a few jobs, and check the /show_count route to make sure it has incremented accordingly.