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acme/checkout-service#128Cache session validation in Redis4 of 4 changes explained

stop 01 / 04supporting

Introduce SessionCache interface

What. Defines get/set/delete for validation results with TTL.

Why. Isolates caching behind an interface so the in-process trial could be swapped for Redis without touching the middleware.

internal/auth/cache.go

@@ -0,0 +1,8 @@+package auth++type SessionCache interface {+	Get(k string) (bool, bool)+	Set(k string)+	Delete(k string)+}+// ... 38 lines total

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Coding session10:24 AM

$ git checkout -b feat/retry-logic

$ make test

Tests failed (2) …

$ vim src/api/client.py

# add exponential backoff …

$ make test

All tests passed (248)

Push to open a PRfeat/retry-logic →

Review AssistIntent Document

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Reason for the changeAddress transient API failures that cause user-facing errors and retries.Assumptions to challengeThat retries are safe for all endpoints, and won’t mask persistent failures.What was verifiedAdded unit tests for retry behavior, confirmed no regression in existing flows.

Guided reviewPR #4821

Review with context, not just code.

src/api/client.pyView file →

42try:

43+ for i in range(RETRIES):

44+ resp = self._request(...)

45+ if resp.ok:

46+ return resp

Check this change against the intent

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Tests cover the behavior

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