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#6946 uncached-var dedupe: every uncached var is re-sent once right after hydrate, dict key order defeats the dedupe, and the _UNKEYABLE_VALUE branch is unreachable

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Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
55/100
Tipo di issue
Bug
Chiarezza
Abbastanza chiara
Stato di attività
Attiva
Stack tecnologico
python
Ambito
backend-api-design, testing-qa

Direzione di ricerca

Start with State.hydrate, _get_resolved_delta, and _delta_value_key, then reproduce the behavior using event_loop/scripts/wsdrive.py and the /dedupe page, including Unkeyable.u_obj. Compare the hydrate and subsequent frames, dict ordering, and null-serializing values; done means the three reported cases match the expected behavior and the existing #6946 scenarios remain valid.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

Describe the bug

Three polish items in the #6946 delta dedupe for @rx.var(cache=False), found while verifying it end to end (the feature itself works: ~42% fewer inbound websocket bytes on the campaign's click sequence, correct per client token, survives reload and redis multi-worker).

  1. Every uncached var is re-sent once right after hydrate. State.hydrate emits self.dict(), which does not go through the delta recording, so the very next event (on_load_internal, fired immediately) re-sends all of them: a 3 318 B hydrate frame followed by a 447 B frame containing only the uncached vars. One redundant frame per page load; on reconnect with a warm memo it does not appear.
  2. Dict key order defeats the dedupe. _delta_value_key digests the JSON text, so {"a": 1, "b": 2} and {"b": 2, "a": 1} have different keys and such a var is re-sent on every event, while the changelog says the value is "only included in the delta when it actually changed". Either canonicalize (sort_keys=True) or document it.
  3. The _UNKEYABLE_VALUE branch is dead, and unserializable values dedupe against each other. _delta_value_key treats a json_dumps exception as "always send", but reflex's json_dumps never raises for unknown types; it returns null for complex, a bare object() or an arbitrary class instance. Two different unserializable values therefore key identically: a complex(n, 1) var is never re-sent across three bumps.

To Reproduce

The campaign's elapp app and websocket-frame driver: event_loop/ (scripts/wsdrive.py, the /dedupe page; the Unkeyable.u_obj var for item 3), NOTES.md sections "#6946" and "anomalies" 1 to 3.

Expected behavior

Hydrate records what it sends (or on_load_internal skips values the hydrate frame carried); dict values are keyed canonically or the changelog states the limitation; values that serialize to null are either always sent or keyed by identity.

Specifics

  • Reflex 0.9.12a1 and 0.9.12a2 (#6946 is new in 0.9.12, so no baseline); after #7216 the recording moved to _get_resolved_delta, which does not change any of the three
  • Python 3.11.15, Linux

Additional context

0.9.12a1 pre-release QA, event_loop cluster, LOW. Full write-up: FINDINGS.md.

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