perf(waves): stop sending an observer on anonymous waves requests - #1648
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Logged out, both waves views fell back to Ecency's moderation account as the observer. That fallback used to be what filtered the anonymous feed, but esync now applies the moderation mute list to every waves query on its own, so the parameter no longer changes a single row: the same 50 rows come back in the same order with and without it. What it does change is the cache tier. esync treats any request carrying an observer as personalised and skips its 60s shared response cache, on the grounds that a per-viewer key space is unbounded. Anonymous traffic is the opposite of that -- one key every visitor could share -- so every anonymous visitor was paying for a cache entry no one else could reuse. Uncached that request is ~8ms; served from the cache it is ~1.3ms. Pass undefined instead, so anonymous waves and shorts requests land on the shared entry.
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughWaves list and reels views no longer use ChangesWaves observer handling
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to Anonymous waves requests will use shared caching without changing their responses, while logged-in requests retain personalized behavior. No actionable merge-blocking risk remains after normal checks and review. Poem
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PR Summary by Qodoperf(waves): avoid observer on anonymous requests to hit shared cache
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Code Review by Qodo🐞 Bugs (0) 📘 Rule violations (0) 📎 Requirement gaps (0)
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Code Review by Qodo
1. Missing observer regression coverage
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| // marks a request personalised, and personalised requests skip the 60s shared | ||
| // response cache. Every anonymous visitor was paying for a per-viewer cache | ||
| // entry that no other viewer could ever reuse. | ||
| const observer = username; |
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1. Missing observer regression coverage 📘 Rule violation ▣ Testability
The changed waves and shorts request behavior is functional code, but this PR adds or updates no automated test that verifies anonymous requests omit observer while authenticated requests still pass username. This leaves the cache-tier change and logged-in behavior unprotected against regression.
Agent Prompt
## Issue description
The waves views now pass `undefined` for anonymous observers, but no test in this change exercises the new request behavior or verifies that authenticated usernames remain observers.
## Issue Context
Add tests for both `WavesListView` and `WavesReelsView` (or their query option integration) that assert anonymous requests omit `observer` and authenticated requests include the username. Cover the relevant feed and shorts paths.
## Fix Focus Areas
- apps/web/src/app/waves/_components/waves-list-view.tsx[50-53]
- apps/web/src/app/waves/_components/waves-reels-view.tsx[22-26]
- packages/sdk/src/modules/posts/queries/get-waves-feed-query-options.ts[120-128]
- packages/sdk/src/modules/posts/queries/get-shorts-feed-query-options.ts[131-139]
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Qodo is right that this change had no test behind it, and this is the kind of change that needs one: the response is byte-identical with and without the parameter, so a fallback creeping back in breaks nothing visible -- it only moves every anonymous request off the shared cache, silently. Five cases across both views: anonymous omits the observer, a logged-in viewer still sends their own name (or their personal mutes stop being applied), and neither view ever substitutes the moderation account for a missing viewer. Checked the tests fail for the right reason: restoring `username || DEFAULT_OBSERVER` turns the two anonymous cases red and leaves the logged-in ones green.
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Fair, and it is the right finding for this particular change. The response is byte-identical with and without the parameter, so if Added
It asserts on the arguments reaching I checked the tests fail for the right reason rather than trusting a green run: putting Restored, everything green: typecheck 0, 344 files / 3241 tests passed, lint 0, and all four script audits 0. Note for anyone reading the checks: CodeRabbit did not review this PR — it hit its free OSS review limit and posted a "Review limit reached" notice instead, so Qodo's pass is the only bot review here. |
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Actionable comments posted: 1
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Inline comments:
In `@apps/web/src/specs/app/waves/waves-observer.spec.tsx`:
- Around line 39-49: Update the mocked query options in the waves observer test
to use QueryKeys.posts.wavesFeed(params), QueryKeys.posts.shortsFeed(params),
and QueryKeys.posts.promoted("waves") instead of literal array keys, keeping the
mocks aligned with the SDK query options.
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📒 Files selected for processing (4)
apps/web/src/app/waves/_components/waves-list-view.tsxapps/web/src/app/waves/_components/waves-reels-view.tsxapps/web/src/consts/observer.tsapps/web/src/specs/app/waves/waves-observer.spec.tsx
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Checked the claim in point 1 instead of preserving it. It says an observer only marks content on the bridge, so swapping it never shortens a feed or a comment thread. The first half holds for ranked feeds; the second is wrong. Same thread, same call, three observers: ecency nodes= 60 depth1= 40 muted authors: none good-karma nodes=303 depth1=281 muted authors: present zzz-no-such-account-xyz nodes= 0 depth1= 0 bridge.get_discussion drops the observer's muted authors outright. That is load-bearing here: it is why the decks thread columns are filtered at all, since they read the bridge directly and pass no observer, so they resolve to CONFIG.defaultObserver and inherit Ecency's mutes. Reading the old comment, they look like a hole in the moderation filter and are not one. Also worth recording: an observer that is not a real account returns an empty thread rather than an unfiltered one.
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Adversarial pass over this PR. Two things came out of it, one a non-issue worth recording and one a doc correction. Checked first: does anything prefetch the waves feed server-side under the old key? If Then checked the claim in
That mattered for a real question. The decks thread columns read the bridge directly ( No behaviour change in this commit. typecheck 0, 344 files / 3241 tests green. |
CodeRabbit flagged the literal arrays, and it is more than style here. The real key carries the observer, so anonymous and logged-in renders are separate cache entries in production; a literal collapsed them onto one, which is the opposite of what this PR is about and would have quietly misled any later test that seeds or asserts cache state. Added a case pinning that: the two renders must not share a key, and the logged-in one must carry the viewer. It fails if the mocks drift back to a literal, so the alignment stays load-bearing rather than decorative.
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Good catch, and it is more than a style point here.
Switched all three mocks to Also added a case so the alignment stays load-bearing instead of decorative: It asserts the two renders do not share a key and that the logged-in one carries the viewer, so it fails if the mocks ever drift back to a literal. 344 files / 3242 tests green, typecheck 0, lint 0, all four script audits 0. |
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Follow-up from #1644 / ecency/esync-py#28, and safe to land now that the moderation filter is live in production.
Logged out,
WavesListViewandWavesReelsViewboth fell back toDEFAULT_OBSERVER("ecency"). That fallback used to be what filtered the anonymous feed. It no longer is: esync applies the moderation mute list to every waves query on its own, so the parameter changes nothing about the response.Confirmed against the live API rather than assumed:
What it does change is the cache tier. esync treats any request carrying an
observeras personalised and skips its 60s shared response cache — correct reasoning for a per-viewer key space, but anonymous traffic is the opposite: one key every visitor could share. So every anonymous visitor was paying for a cache entry no one else could reuse.Six consecutive requests, live API:
First request fills the cache, the rest serve from it at ~1.3ms instead of ~8ms. The larger win is upstream: N anonymous requests collapse to one database query per 60s per key instead of one each.
Logged-in behaviour is unchanged — the viewer's own username still goes as the observer, so their personal mutes still apply server-side and pages still arrive full.
Also updates the
DEFAULT_OBSERVERdoc to say the waves feed no longer sends it. Bridge reads still use it exactly as before; only the waves and shorts views changed.Checks
Summary by CodeRabbit
Bug Fixes
Tests