perf: cache product version archive inspection

[superdav42]

Summary

• cache product version lists and remote archive metadata in the dedicated WordPress object-cache group
• cache failed archive inspections for one hour so unavailable or malformed archives are not downloaded on every page request
• retain transient-based cross-request caching when no persistent object-cache backend is active
• preserve product cache invalidation and privacy-safe hashed remote cache keys

Verification

• composer test
• ../../../../vendor/bin/phpcs inc/class-product-versions.php tests/product-versions-remote-download-regression.php
• git diff --check origin/main...HEAD

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Summary by CodeRabbit

• Bug Fixes

  • Improved product version checks by reducing repeated remote lookups and improving response times.
  • Product download metadata is now cached more reliably, including unavailable or failed checks.
  • Cache invalidation is handled more consistently when product information changes.
  • Added fallback behavior to preserve reliable version checking when enhanced caching is unavailable.

• Tests

  • Expanded coverage for product downloads, cache behavior, failure handling, and cache invalidation.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: ed8ba6b9-be97-49c6-bed9-45f215c0bbf0

📥 Commits

Reviewing files that changed from the base of the PR and between 5d3ad38 and 2ce7838.

📒 Files selected for processing (2)

• inc/class-product-versions.php
• tests/product-versions-remote-download-regression.php

📝 Walkthrough

Walkthrough

Product version caching now uses shared WordPress object caching with transient fallback. Remote archive metadata supports positive and negative cache entries with separate expiration periods. Regression tests cover cache hits, failures, invalidation, and fallback behavior.

Changes

Product Version Caching

Layer / File(s)	Summary
Shared cache abstraction inc/class-product-versions.php	Product version cache reads, writes, and deletion use the wu_product_versions object-cache group with transient fallback. Cached empty arrays remain distinguishable from cache misses.
Remote metadata caching inc/class-product-versions.php	Remote archive inspection caches successful metadata and failures. Invalid or unreadable files receive one-hour negative cache entries.
Cache regression coverage tests/product-versions-remote-download-regression.php	Regression fixtures and assertions cover grouped object caching, transient fallback, negative caching, product-version invalidation, and remote download failures.

Estimated code review effort: 4 (Complex) | ~45 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Product_Versions
  participant SharedCache
  participant RemoteArchive
  Product_Versions->>SharedCache: Read remote metadata
  alt Cache hit
    SharedCache-->>Product_Versions: Return positive or negative result
  else Cache miss
    Product_Versions->>RemoteArchive: Inspect archive
    RemoteArchive-->>Product_Versions: Return metadata or failure
    Product_Versions->>SharedCache: Store result with expiration
  end

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Possibly related PRs

• Ultimate-Multisite/ultimate-update-server-plugin#33: Adds the earlier remote archive metadata caching and Product_Versions cache behavior extended by this change.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: caching product version archive inspection.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch perf/cache-product-version-inspection

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@inc/class-product-versions.php`:
- Line 791: Update clear_cache() around self::delete_cached_value('versions_' .
$product_id) to also invalidate the current product’s remote_version_* download
metadata keys, ensuring archive replacements with unchanged identifiers do not
reuse stale remote metadata. Use the existing product download metadata key
scheme and preserve the current versions cache invalidation.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: bea13144-0e21-419d-8c9e-af16548b5cde

📥 Commits

Reviewing files that changed from the base of the PR and between 515ca0f and 5d3ad38.

📒 Files selected for processing (2)

• inc/class-product-versions.php
• tests/product-versions-remote-download-regression.php