refactor: one axis_row_payload for every writer and checker (#809 audit follow-up) - #811
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The #809 audit's finding A: the per-axis secondary payload was hand-copied at five sites — the batch mirror row, the direct-path mirror closure, reconcile's desired map, verify_grovedb's expected payload, and the cost estimator's worst-case row — and three of the surrounding comments still described the pre-#809 empty-Item shape. The enforcement of "these five must stay byte-identical" was human discipline; a contributor trusting the stale comment and "restoring" the old payload at one site would either false-flag healthy databases or make two entry points commit different root hashes for identical writes. The lockstep is now structural: one pub(crate) axis_row_payload in operations::indexed_tree, called from all five sites (the estimator feeds it worst-case aggregates, which stay within count_value_as_sum's domain by construction). A grid test pins the payload per (axis, count, sum) — including that each axis IGNORES the aggregate it doesn't store, and the fail-closed bound — plus golden serialized bytes, so any change to the shape is a deliberate, reviewed event. The stale comments are gone, replaced by pointers to the one definition. Also from the audit (finding C): axis_secondary_tree_type now documents that dual-aggregate secondaries are a SECURITY requirement — node_hash_with_count and node_hash_with_sum share an untagged preimage layout, so a single-aggregate secondary would make a band Total forgeable from a Population proof by node-type relabeling. The comment forbids "optimizing" any axis back to a single-aggregate tree without first adding domain separation. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughIndexed-tree secondary payload construction is centralized in ChangesIndexed secondary payload consistency
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to Direct and batch mirroring may produce different authenticated tree shapes and root hashes for the same final data, so this PR is not merge-ready until the behavior is aligned or the difference is explicitly accepted by the owner. Possibly related PRs
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In `@grovedb/src/operations/indexed_tree.rs`:
- Around line 2677-2707: Update serialized_bytes_are_stable to compare
count_bytes, sum_bytes, and avg_bytes against fixed recorded byte vectors rather
than serializing Element values at assertion time; retain one golden vector for
each IndexAxis representative so serialization changes cause the test to fail.
- Around line 2448-2452: Update the direct indexed-tree write path so a same-key
payload change replaces the existing element in place instead of deleting and
reinserting it, while preserving delete/reinsert behavior when the key changes.
Add a direct-versus-batch root-equality test covering the Avg transition from
(count, sum) (1, 5) to (2, 10), plus the required proof-verification,
cost-accounting, reference-integrity, and applicable batch-atomicity coverage.
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📒 Files selected for processing (5)
grovedb/src/batch/indexed_tree/mirror.rsgrovedb/src/estimated_costs/average_case_costs.rsgrovedb/src/lib.rsgrovedb/src/operations/indexed_tree.rsgrovedb/src/operations/proof/indexed_axis/generate.rs
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## develop #811 +/- ##
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Coverage 92.21% 92.21%
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Files 267 267
Lines 81658 81683 +25
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+ Hits 75300 75326 +26
+ Misses 6358 6357 -1
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… bytes Two review findings on the audit follow-up, both real: The direct write path DELETED AND REINSERTED an avg-secondary row whose payload changed at a fixed sort key ((1, 29) -> (2, 58) keeps avg = 29), while the batch mirror emits a single replacement write. Delete+reinsert rebalances the AVL twice and can settle a different shape: reproduced red on an interior node — the two write paths committed DIFFERENT grove roots for identical data (a leaf-position first attempt stayed green, which is why the test pins the modified key mid-range). The direct path now skips the delete when the key does not move, so the insert replaces in place exactly like the batch put. Pre-existing since the avg axis existed; surfaced by this PR's diff region. The golden-bytes test serialized both sides at assertion time, so a serialization-format change would move both and pass. The vectors are now fixed literals per axis; a failure here means payload bytes in authenticated state changed — a consensus event, not a refactor. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Follow-up to the #809 security audit — findings A and C — plus one live consensus fix found during review.
An avg-secondary payload change at a fixed sort key (
(1, 29) → (2, 58)keeps avg = 29) diverged between the two write paths: the batch mirror emits a single replacement write, but the direct propagation path deleted and reinserted — a double rebalance that can settle a different AVL shape. Reproduced on an interior node: two databases applying the same logical mutation committed different grove roots. Existed since the avg axis did. The direct path now skips the delete when the key doesn't move;direct_and_batch_agree_on_root_for_a_fixed_key_avg_payload_changepins root equality across both paths (with the modified key deliberately mid-range — an edge-position repro stays green by rebalancing luck). Count/sum axes are structurally immune: their keys encode the stored aggregate.Finding A — the payload lockstep becomes structural
One
pub(crate) axis_row_payload(axis, count, sum)called from all five writer/checker sites (batch mirror, direct mirror, reconcile,verify_grovedb, cost estimator's worst-case row). Grid test pins the payload per(axis, count, sum)including the fail-closed overflow bound; golden test pins the serialized bytes as fixed literals ([3,14,0]/[3,5,0]/[9,0,10,0]) so a format change fails loudly instead of moving both sides of a circular comparison. Stale pre-#809 comments deleted.Finding C — the invariant written where it lives
axis_secondary_tree_typedocuments that dual-aggregate secondaries are a security requirement:node_hash_with_count/_with_sumshare an untagged preimage layout, so a single-aggregate secondary would make a bandTotalforgeable from aPopulationproof by node-type relabeling. Reverting any axis to single-aggregate requires domain separation first.Verification
Exit-code validated:
cargo test --workspace --all-features0,cargo clippy --workspace --all-features -- -D warnings0, verify-only build 0. The payload bytes are identical before and after the refactor (golden-pinned); the only behavior change is the divergence fix, which makes the direct path match what the batch path always did.🤖 Generated with Claude Code