automate match making

[JnBrymn]

what

• created initialize_automated_matching command
• it sets up a periodic task to request matches (send a message to topic channels to allow users to sign up for the next round of matches)
• each time matches are requested a single follow-on task is created to make the matches (find matches for users using the algorithm from my last PR and then create a direct message to the users and let them know they should match)
• each time ☝️ that is run a single follow-on task is created to remind users to set up a chat if they haven't done so already
• ALSO each time the periodic request matches task runs it connects to the django background_tasks task_failed signal. If a task fails then the request matches is restarted. This is janky, but it seems like the best thing we have so that we don't have to restart everything by hand if there is a failure
• I also am capturing exceptions and sending them to sentry.
• I added documentation

why

closes https://github.com/penny-university/penny_university/issues/299

[JnBrymn]

I'm checking on my QA to see if it works:

from background_task.models import Task
print('\n'.join([f'{t.task_name}: {t.task_params}' for t in Task.objects.all()]))

# this is correct:
# matchmaking.tasks._request_matches_task: [[], {"slack_team_id": "TNJ631DFU"}]

#so we run it
from matchmaking.tasks import _request_matches_task
_request_matches_task.now(**{"slack_team_id": "TNJ631DFU"})

# and it worked and everyone requested a match

# So we check and then run the matches
print('\n'.join([f'{t.task_name}: {t.task_params}' for t in Task.objects.all()]))

# matchmaking.tasks._make_matches_task: [[], {"slack_team_id": "TNJ631DFU"}]
# correct - running it manually

from matchmaking.tasks import _make_matches_task
_make_matches_task.now(**{"slack_team_id": "TNJ631DFU"})
# logged: "make_matches for TNJ631DFU"

Two more steps to go.

[JnBrymn]

If you'll recall, before the break I set up my QA environment to do automated tests and we saw that _request_matches_task worked because Colin, Sydney, Nick and I were able to sign up to meet in a few different channels.

Today I made a couple of small changes and deployed to QA and ran this test there:

>>> from matchmaking.tasks import _make_matches_task, _remind_matches_task
>>> _make_matches_task.now('TNJ631DFU')  # this is me manually calling the the next step which makes the matches

# here's the output
make_matches for TNJ631DFU: ['colin@cpdev.me', 'jfberryman@gmail.com'] in  penny-university
make_matches for TNJ631DFU: ['nick.chouard@gmail.com', 'sydneycnoh@gmail.com'] in  general
set up _remind_matches_task for TNJ631DFU

I looked in slack and it sent me this message

Then I ran the next step:

>>> _remind_matches_task.now('TNJ631DFU')
remind_matches for TNJ631DFU

And I received this message in slack

I think I'll deploy it!