Code RoomIdempotency check after side effects

HardPrep Room Coding #2129

Idempotency check after side effects

Code reviewNetworking & APIsSenior–Staff~20 min

Review this Python webhook consumer that should process each event exactly once.

What a strong answer looks like

Separate real bugs from style. Rank issues by severity, point at the root cause rather than the symptom, and suggest a concrete fix, specific and kind.

0:00 of about 20 min

Mark a line and say what kind of problem it is.0 findings

1def handle(event):

2 if seen.exists(event.id):

3 return

4 send_fulfillment_email(event) # external side effect

5 charge_customer(event) # external side effect

6 seen.add(event.id) # mark processed

Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.