iframe-proxy

poulet42 · 2026-08-29T21:47:09Z

as per @zkochan feedback here. This PR updates the cache system so:

every run saves cache under a unique key, regardless if a cache entry already exists for the current lockfile
cache restoration looks for the most recent lockfile match

Summary by CodeRabbit

Bug Fixes
- Improved cache restoration and saving to prevent partial or failed installations from being reused incorrectly.
- Cache saves now use unique run-specific keys while restoring the latest valid cache for the current lockfile.
- Clarified cache-hit reporting to indicate an exact lockfile match rather than a fallback cache.
Documentation
- Updated documentation describing cache key behavior and lockfile requirements.

coderabbitai · 2026-08-29T21:47:20Z

No actionable comments were generated in the recent review. 🎉

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src/cache-restore/keys.test.mjs
src/cache-restore/keys.ts
src/cache-restore/run.ts

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🔇 Additional comments (3)

src/cache-restore/keys.ts (1)

22-31: LGTM!

Also applies to: 33-35

src/cache-restore/keys.test.mjs (1)

3-3: LGTM!

Also applies to: 34-45, 105-119

src/cache-restore/run.ts (1)

10-10: LGTM!

Also applies to: 51-51, 65-76

📝 Walkthrough

Walkthrough

The cache flow now uses a lockfile-specific restore prefix and run-unique save keys. cache-hit checks lockfile matching. Cache saving no longer skips based on restored state. Documentation and tests cover the new behavior.

Changes

Cache key and restore flow

Layer / File(s)	Summary
Save key contract and tests `src/cache-restore/keys.ts`, `src/cache-restore/keys.test.mjs`	`getPrimaryCacheKey` is replaced by `getSaveCacheKey`. Save keys include the run ID and resolved runtime versions. Tests cover runtime, run, retry, restore-prefix, and exact-hit behavior.
Lockfile restore and cache-hit flow `src/cache-restore/run.ts`	Restore uses a lockfile-specific prefix with a plain-prefix fallback. Finalization creates a run-attempt-specific save key and reports whether the restored key matches the lockfile prefix.
Cache save behavior and documentation `src/cache-save/run.ts`, `README.md`, `action.yml`	Saving no longer skips work when restored state matches the primary key. Documentation describes run-unique save keys, fallback restoration, and lockfile-based `cache-hit` semantics.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: 🔵 Low · up to 641dc

Each run now creates a restorable cache and later runs prefer the freshest matching lockfile cache. If a workflow fails after its cache key is finalized, a partial store could be restored by a later matching run; this is bounded but should remain an explicit owner follow-up.

Suggested reviewers: blankparticle, stanzilla

Sequence Diagram(s)

sequenceDiagram
  participant CacheRestore
  participant CacheService
  participant CacheFinalize
  CacheRestore->>CacheService: Restore with lockfile prefix and runtime-store fallback
  CacheService-->>CacheRestore: Return restored key
  CacheRestore->>CacheFinalize: Pass lockfile prefix and resolved runtimes
  CacheFinalize->>CacheService: Save with run ID and run attempt

Poem

A rabbit checks the lockfile bright
Each run saves with a key in sight
Partial stores cannot claim the way
Runtime paths remain distinct each day
The hit flag shows what matched today

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies both main changes: adding the run ID to cache keys and restoring the freshest matching lockfile entry. It is concise and specific.
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.

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qodo-code-review · 2026-08-30T06:45:57Z

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greptile-apps · 2026-08-30T06:48:27Z

Confidence Score: 4/5

The PR is not yet safe to merge because equivalent cache-writing jobs in one workflow attempt can still target the same immutable cache key and prevent one job’s final store from being published.

The current key includes workflow run and attempt identity but no job or matrix identity, so concurrent equivalent jobs still compute the same save key and only one resulting snapshot can be retained.

Files Needing Attention: src/cache-restore/run.ts, src/cache-restore/keys.ts, src/cache-save/run.ts

_{Reviews (3): Last reviewed commit: "dedupe save keys across re-runs, extract..." | Re-trigger Greptile}

greptile-apps · 2026-08-30T06:48:30Z

+  const runId = process.env.GITHUB_RUN_ID ?? ''
+  const primaryKey = getSaveCacheKey(cache.lockfileKeyPrefix, resolvedRuntimes, runId)


Workflow-wide cache key collisions

If two cache-writing jobs in one workflow run share the same OS, architecture, runtime identity, and lockfile, GITHUB_RUN_ID gives them identical immutable save keys. The second job cannot publish its final store, leaving the first snapshot in place or causing the post action to report a reservation conflict.

Knowledge Base Used: pnpm store cache save

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

greptile-apps · 2026-08-30T06:48:31Z

+  // We don't need to download everything again if only one dependency changed.
+  // We can still re-use a previous store to cache the rest of the unchanged
+  // dependencies. Saves are keyed by run id (see getSaveCacheKey), so
+  // lockfileKeyPrefix itself never matches exactly: every restore falls
+  // through to the prefix search and picks up the most recent matching entry.


Comments replace cache behavior tests

These new comments narrate restore ordering and save control flow, while focused tests do not cover freshest-prefix selection, fallback cache-hit reporting, or missing-primary-key save handling. Refactor the behavior to be self-explanatory and add executable coverage so these contracts cannot silently drift.

Context Used: Comments and docs in code are suspicious. Is test ... (source)

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

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Actionable comments posted: 1

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Inline comments:
In `@src/cache-restore/run.ts`:
- Line 71: Update the save-key construction in getSaveCacheKey to include
GITHUB_RUN_ATTEMPT alongside GITHUB_RUN_ID, ensuring each workflow attempt
produces a distinct immutable key. Add a regression test covering two attempts
with the same run ID and verifying different save keys.

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action.yml
src/cache-restore/keys.test.mjs
src/cache-restore/keys.ts
src/cache-restore/run.ts
src/cache-save/run.ts

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…tests

barclayadam · 2026-09-15T13:15:29Z

One thing worth checking before this lands: the run id does not discriminate between jobs, so on a large fan-out this does not stop the reservation races — and it multiplies entries.

GITHUB_RUN_ID and GITHUB_RUN_ATTEMPT are properties of the workflow run, not the job. Every job in a matrix, and every job in a called reusable workflow, sees the same pair. So for a workflow whose jobs share a lockfile and runtime, getSaveCacheKey returns an identical string for all of them:

pnpm-cache-<os>-<arch>-<runtimes>-<lockfileHash>-<resolvedRuntimes>-<runId>-<runAttempt>

With the primaryKey === restoredKey skip removed, every one of those jobs now reaches saveCache unconditionally, all targeting that one key. One wins the reservation and the rest log:

##[warning]Failed to save: Unable to reserve cache with key …, another job may be creating this cache.

which is the same failure mode the current keying produces, just arrived at differently. On a fan-out of roughly a hundred jobs that is ~100 warnings per run, and ~99 full store uploads that are built and compressed before being discarded — in the region of 18s of job time each, against a store of several hundred MB.

The quota point you raised on #40 also gets sharper here. Today a given lockfile occupies one entry and is refreshed in place; with a run id it becomes one entry per run. A repository doing several deploys a day, with a store in the hundreds of MB, will hold many copies of near-identical content and push out entries that are still useful — including, in the worst case, the store the next run wanted to restore from.

Adding a per-job discriminator would fix the collision but makes the entry growth considerably worse, so that does not seem like the way out either.

The lever that would actually help this shape of workload is letting a job restore without saving — an input such as save: false (or cache: 'restore'). One warm upstream job publishes the store, the fan-out consumes it and skips the post step entirely. That removes the races by construction rather than by key uniqueness, and it reduces entries instead of adding them. Happy to open that as a separate feature request if it is useful — it is orthogonal to the partial-store problem this PR is solving, and would compose with it.

include runid in cache key, restore freshest lockfile match

67d91ee

poulet42 force-pushed the new-caching-strategy branch from 1a81520 to 67d91ee Compare August 30, 2026 06:45

poulet42 marked this pull request as ready for review August 30, 2026 06:45

greptile-apps Bot reviewed Aug 30, 2026

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coderabbitai Bot requested changes Aug 30, 2026

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Comment thread src/cache-restore/run.ts

dedupe save keys across re-runs, extract restore/cache-hit logic for …

641dc61

…tests

poulet42 force-pushed the new-caching-strategy branch from 36b07a7 to 641dc61 Compare September 2, 2026 20:32

coderabbitai Bot approved these changes Sep 2, 2026

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Neonsy mentioned this pull request Sep 14, 2026

Post step caches lockfile verification log rejected by the install step #55

Open

barclayadam mentioned this pull request Sep 15, 2026

Allow restoring the store cache without saving it (e.g. a save input) #56

Open

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include runid in cache key, restore freshest lockfile match - #43

include runid in cache key, restore freshest lockfile match#43
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		const runId = process.env.GITHUB_RUN_ID ?? ''
		const primaryKey = getSaveCacheKey(cache.lockfileKeyPrefix, resolvedRuntimes, runId)

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