Too many reviewers are requested (sometimes) when manually requesting reviewers

[James-Firth]

Potential Webhook Race Condition causes too many reviews to be requested.

The opened event sometimes has no users in it. This opened event causes two more request events to be be generated as Git Slackin requests X more reviews to hit the required number.

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Reproduction

• Click Open PR
• Request reviews from 2 people (if 2 is the required number of reviewers for you)
• Open PR

Git Slackin will receive 3 webhook events:

• PR Opened
• Review Requested 1
• Review Requested 2

The PR Opened event will cause Git Slackin' to look for 2 random folks to review causing 2-4 (because it may overlap with the ones manually assigned) Reviewers to be requested.

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Solution

This could be fixed by putting a setTimeout after receiving an opened PR event for a few seconds. Generally it looks like within 1 second all the events will come in, so call it 4 seconds to be safe?

I can use the PR as the unique identifier so we can cancel/reset the timeout if necessary.

This may be a good time to try implementing #31 as well?

[James-Firth]

May tie-in well with the Review Request revamp required for #38 and #25