fix(dpp)!: version-gate distribution function floating-point evaluation - #3462
fix(dpp)!: version-gate distribution function floating-point evaluation#3462PastaPastaPasta wants to merge 10 commits into
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📝 WalkthroughWalkthroughThe PR adds platform-version-controlled math operations for token distribution evaluation. It pins ChangesToken Distribution Math Versioning
Priority: ➖ Normal — Impact reflects medium issue severity. Estimated code review effort: 3 (Moderate) | ~25 minutes Severity of issue fixed: Medium Merge Risk: 🟡 Moderate · up to Token reward interval requests using an unsupported evaluation version can inconsistently succeed for fixed or empty intervals while failing for other distributions. This fail-closed versioning gap should be corrected before merge. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## v4.2-dev #3462 +/- ##
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- Coverage 85.36% 84.95% -0.42%
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Files 2792 2792
Lines 370547 372559 +2012
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+ Hits 316331 316502 +171
- Misses 54216 56057 +1841
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Code Review
PR correctly version-gates four f64 transcendental call sites in DistributionFunction::evaluate behind a new distribution_function_evaluate_version field, with the new libm path activated only by TOKEN_VERSIONS_V3 (which is intentionally not yet wired to any PlatformVersion). The change is consensus-safe (v0 path preserved bit-for-bit) and threaded cleanly through evaluate_interval/rewards_in_interval. Main feedback is that the new version dispatch uses a wildcard fallback instead of the codebase's explicit-arms + UnknownVersionMismatch convention; plus minor test-comment and orphan-constant nits.
🟡 1 suggestion(s) | 💬 2 nitpick(s)
🤖 Prompt for all review comments with AI agents
These findings are from an automated code review. Verify each finding against the current code and only fix it if needed.
In `packages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/evaluate.rs`:
- [SUGGESTION] packages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/evaluate.rs:228-235: Wildcard `_ =>` dispatch diverges from the repo's fail-closed version pattern
All four new version gates (lines 228-235, 339-346, 421-428, 566-573) match `0 => std` and `_ => libm`, so any future `distribution_function_evaluate_version` value (2, 3, …) silently executes the v1 libm semantics instead of failing closed. Elsewhere in `rs-dpp` (e.g. `document/extended_document/v0/serialize.rs:130-133`, `document/serialization_traits/cbor_conversion/mod.rs:40-43`, `document/v0/serialize.rs:1457`) the codebase consistently enumerates known versions and ends with `version => Err(ProtocolError::UnknownVersionMismatch { method: ..., known_versions, received: version })`. Since this is consensus-critical reward math, a future protocol version bump that intends a third algorithm (e.g. fixed-point) but forgets to update this site would silently pay rewards under v1 semantics on this code path rather than producing a clean version-mismatch error. Tightening to explicit `1 => libm` + `version => Err(UnknownVersionMismatch …)` makes any future version change a typechecked code edit. Apply to all four call sites in this file.
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🧹 Nitpick comments (4)
packages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/evaluate.rs (1)
670-678: ⚡ Quick winPin the baseline assertions to an explicit evaluation version.
Most of this suite uses
PlatformVersion::latest(), so once a future PR pointslatest()atTOKEN_VERSIONS_V3, these tests will silently stop exercising v0 semantics and some expectations may flip without any change in this file. A small helper that cloneslatest()and forcesdistribution_function_evaluate_version = 0would keep the legacy-path coverage stable, while the version-1 determinism cases stay explicit.♻️ Example helper
mod tests { use super::*; use platform_version::version::PlatformVersion; use std::collections::BTreeMap; + + fn legacy_distribution_math_version() -> PlatformVersion { + let mut version = PlatformVersion::latest().clone(); + version + .dpp + .token_versions + .distribution_function_evaluate_version = 0; + version + }🤖 Prompt for 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. In `@packages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/evaluate.rs` around lines 670 - 678, The tests call DistributionFunction::evaluate(...) with PlatformVersion::latest(), which will change behavior when latest() advances; update the tests (e.g., test_fixed_amount and other evaluate tests) to pin the legacy evaluation path by cloning PlatformVersion::latest() into a mutable variable and setting distribution_function_evaluate_version = 0 before passing it to distribution.evaluate so the assertions remain stable; locate uses of PlatformVersion::latest() in the evaluate tests and replace them with the cloned-and-modified PlatformVersion instance referenced when calling DistributionFunction::evaluate.packages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/evaluate_interval.rs (1)
1903-1920: ⚡ Quick winPin these explanation tests to a fixed math version too.
These assertions currently inherit whatever
PlatformVersion::latest()means at the time the test runs. Whenlatest()eventually switches to the deterministic token version, this suite will stop validating the legacy interval totals by default. Mirroring the explicit v0/v1 fixtures here would keep the call-chain coverage stable across future platform bumps.🤖 Prompt for 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. In `@packages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/evaluate_interval.rs` around lines 1903 - 1920, The test uses PlatformVersion::latest() which makes it float as the platform evolves; change the call in test_fixed_amount_explanation_first_claim (and sibling explanation tests) to use an explicit legacy math platform version instead of latest() so the assertions remain fixed — replace PlatformVersion::latest() with a pinned PlatformVersion representing the legacy math (e.g., the v0/v1 fixture you use elsewhere such as PlatformVersion::v0() or PlatformVersion::new(0), depending on your API) when calling DistributionFunction::evaluate_interval_with_explanation to ensure deterministic behavior.packages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/validation.rs (1)
1825-1825: ⚡ Quick winPin the platform version in this exact-value test.
evaluate()is version-gated now, soPlatformVersion::latest()will make this assertion drift when a later protocol version flipsdistribution_function_evaluate_version. Prefer a fixed platform version here, or explicitly override just the distribution-function evaluation version used by the test.🤖 Prompt for 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. In `@packages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/validation.rs` at line 1825, The test calls dist.evaluate(0, 4, PlatformVersion::latest()), which will drift as distribution_function_evaluate_version changes; replace PlatformVersion::latest() with a pinned PlatformVersion instance (or construct a PlatformVersion and explicitly set distribution_function_evaluate_version to the expected version) so that evaluate() is invoked with a fixed protocol version; update the call site (the evaluate invocation) to pass that pinned/overridden PlatformVersion instead of PlatformVersion::latest().packages/rs-drive-abci/src/execution/validation/state_transition/state_transitions/batch/tests/token/distribution/perpetual/block_based.rs (1)
2296-2335: ⚡ Quick winAvoid
PlatformVersion::latest()in exact numeric regression checks.These assertions now depend on version-gated math behavior, so they will become brittle as soon as
latest()starts consuming the deterministic evaluator. Pin the platform version used by the test, or construct a test-only version with the intendeddistribution_function_evaluate_version, so the expected constants stay stable.Also applies to: 2413-2416
🤖 Prompt for 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. In `@packages/rs-drive-abci/src/execution/validation/state_transition/state_transitions/batch/tests/token/distribution/perpetual/block_based.rs` around lines 2296 - 2335, The test uses PlatformVersion::latest() when calling InvertedLogarithmic::evaluate (and in other nearby assertions), which makes numeric expectations brittle; change those calls to a pinned PlatformVersion that encodes the deterministic distribution evaluation you expect (or build a test-only PlatformVersion with the intended distribution_function_evaluate_version) instead of PlatformVersion::latest(); update all evaluate invocations in this test (and the similar calls at the other assertions) to pass that pinned/versioned PlatformVersion so the InvertedLogarithmic::evaluate results remain stable for the asserted constants.
🤖 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.
Nitpick comments:
In
`@packages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/evaluate_interval.rs`:
- Around line 1903-1920: The test uses PlatformVersion::latest() which makes it
float as the platform evolves; change the call in
test_fixed_amount_explanation_first_claim (and sibling explanation tests) to use
an explicit legacy math platform version instead of latest() so the assertions
remain fixed — replace PlatformVersion::latest() with a pinned PlatformVersion
representing the legacy math (e.g., the v0/v1 fixture you use elsewhere such as
PlatformVersion::v0() or PlatformVersion::new(0), depending on your API) when
calling DistributionFunction::evaluate_interval_with_explanation to ensure
deterministic behavior.
In
`@packages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/evaluate.rs`:
- Around line 670-678: The tests call DistributionFunction::evaluate(...) with
PlatformVersion::latest(), which will change behavior when latest() advances;
update the tests (e.g., test_fixed_amount and other evaluate tests) to pin the
legacy evaluation path by cloning PlatformVersion::latest() into a mutable
variable and setting distribution_function_evaluate_version = 0 before passing
it to distribution.evaluate so the assertions remain stable; locate uses of
PlatformVersion::latest() in the evaluate tests and replace them with the
cloned-and-modified PlatformVersion instance referenced when calling
DistributionFunction::evaluate.
In
`@packages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/validation.rs`:
- Line 1825: The test calls dist.evaluate(0, 4, PlatformVersion::latest()),
which will drift as distribution_function_evaluate_version changes; replace
PlatformVersion::latest() with a pinned PlatformVersion instance (or construct a
PlatformVersion and explicitly set distribution_function_evaluate_version to the
expected version) so that evaluate() is invoked with a fixed protocol version;
update the call site (the evaluate invocation) to pass that pinned/overridden
PlatformVersion instead of PlatformVersion::latest().
In
`@packages/rs-drive-abci/src/execution/validation/state_transition/state_transitions/batch/tests/token/distribution/perpetual/block_based.rs`:
- Around line 2296-2335: The test uses PlatformVersion::latest() when calling
InvertedLogarithmic::evaluate (and in other nearby assertions), which makes
numeric expectations brittle; change those calls to a pinned PlatformVersion
that encodes the deterministic distribution evaluation you expect (or build a
test-only PlatformVersion with the intended
distribution_function_evaluate_version) instead of PlatformVersion::latest();
update all evaluate invocations in this test (and the similar calls at the other
assertions) to pass that pinned/versioned PlatformVersion so the
InvertedLogarithmic::evaluate results remain stable for the asserted constants.
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packages/rs-dpp/Cargo.tomlpackages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/evaluate.rspackages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/evaluate_interval.rspackages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/validation.rspackages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/reward_distribution_type/evaluate_interval.rspackages/rs-drive-abci/src/execution/validation/state_transition/state_transitions/batch/tests/token/distribution/perpetual/block_based.rspackages/rs-drive/src/state_transition_action/batch/batched_transition/token_transition/token_claim_transition_action/v0/transformer.rspackages/rs-platform-version/src/version/dpp_versions/dpp_token_versions/mod.rspackages/rs-platform-version/src/version/dpp_versions/dpp_token_versions/v1.rspackages/rs-platform-version/src/version/dpp_versions/dpp_token_versions/v2.rspackages/rs-platform-version/src/version/dpp_versions/dpp_token_versions/v3.rs
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Code Review
Latest commit 2e06247 resolves all three prior findings: the four version-dispatch sites in evaluate.rs now fail closed with ProtocolError::UnknownVersionMismatch (explicit 0/1 arms), v3.rs has a doc comment documenting the deferred PLATFORM_V13 activation, and the inverted-log test comment matches the actual call. One in-scope suggestion remains: the new error path has no regression test. The TOKEN_VERSIONS_V3-unwired nitpicks are intentionally staged per the PR description and not actionable here.
🟡 1 suggestion(s)
🤖 Prompt for all review comments with AI agents
These findings are from an automated code review. Verify each finding against the current code and only fix it if needed.
In `packages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/evaluate.rs`:
- [SUGGESTION] packages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/evaluate.rs:228-242: No regression test for the new UnknownVersionMismatch error path
The four new version-dispatch sites (Polynomial 228-242, Exponential 346-360, Logarithmic 435-449, InvertedLogarithmic 587-602) correctly fail closed with `ProtocolError::UnknownVersionMismatch` for any value other than 0 or 1, but the test suite only exercises the happy paths (`test_*_deterministic_libm_path` at version 1, plus the existing version-0 tests). A grep for `UnknownVersionMismatch` in this file matches only the four production sites — zero tests. Since this is consensus-critical reward math and the new behavior is specifically about rejecting unknown protocol versions, a future edit could reintroduce a wildcard arm at any of the four sites without breaking any test. Add at least one unit test that constructs a `PlatformVersion` with `distribution_function_evaluate_version = 2` (or similar) and asserts `Err(ProtocolError::UnknownVersionMismatch { .. })` for each transcendental variant, or a table-driven test across all four branches.
| start_from_moment_for_distribution, | ||
| max_cycle_moment, | ||
| None, | ||
| platform_version, |
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Activation will retroactively re-price already-emitted cycles, making payouts depend on when an identity claims.
rewards_in_interval walks from start_from_moment_for_distribution (the last-paid moment, arbitrarily far in the past) to max_cycle_moment and calls evaluate(..., platform_version) for every step — using the version active at claim time, not the version active at each cycle's own moment. The single &PlatformVersion reaching evaluate() makes per-moment gating impossible by construction.
Scenario at the distribution_function_evaluate_version 0→1 flip: identities X and Y hold identical Polynomial { m: 1, n: 3 } perpetual distributions that accrued entirely before the fork. X claims at height N-1 and is paid on the std path; Y claims at N+1 and every one of those same pre-fork cycles is recomputed with libm. Using the measured values above, that is 5 vs 4 per cycle — over a long unclaimed interval (bounded by max_token_redemption_cycles, and the step loop by MAX_DISTRIBUTION_CYCLES_PARAM = 32_767) the gap compounds.
This is not a chain split — all nodes at a given height agree — but realized emission for a fixed block range becomes a function of claim timing, and the token's pre-fork history is rewritten for anyone who had not yet claimed. If that is the accepted tradeoff, please say so in the PR description / activation PR so it is a recorded decision rather than an emergent one.
🤖 Posted autonomously by Claude on behalf of pasta.
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Leaving this open; it needs a maintainer decision rather than a mechanical fix. Option A: accept that activation re-prices unclaimed pre-fork cycles at claim time (simple, but two identical distributions can pay different totals depending on which side of activation they claim on). Option B: derive the evaluation version from each cycle's own moment inside rewards_in_interval, which requires threading a moment-to-protocol-version mapping into evaluate_interval and changes this PR's scope. Note that 8d4afc8 wires the gate to PLATFORM_V14, so whichever option is chosen now determines v14 behavior.
🤖 Posted autonomously by Claude on behalf of pasta.
| max_value: *max_value, | ||
| } | ||
| .evaluate(0, start_moment)?; | ||
| .evaluate(0, start_moment, platform_version)?; |
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Registration-time validation and payout-time evaluation can straddle the activation boundary.
This call computes start_token_amount, which then drives the coherence checks a few lines below (start_token_amount == *max → InvalidTokenDistributionFunctionIncoherenceError). Pre-PR there was exactly one implementation, so those checks provably described the numbers emission would later produce. Now validation runs under the version active at registration and emission under the version active at claim.
Concretely: a contract registered under PLATFORM_V12 whose start_token_amount via powf is max_value - 1 passes the incoherence check; after activation libm::pow returns max_value, so the distribution is pinned at its cap from cycle 0 — precisely the degenerate state this validation exists to reject. It is now permanently on-chain in a state the validator would have refused, and there is no re-validation path that catches it.
The mirror case is worse: the accept/reject boundary for new contracts silently moves at the fork, with no version gate on the validation rule itself. Same at lines 447, 637, 815 and 979. Worth confirming this is understood and bounded (the window is narrow — it needs the value to land within one ulp of a clamp boundary), or gating the validation rule alongside the math.
🤖 Posted autonomously by Claude on behalf of pasta.
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Leaving this open; it needs a maintainer decision rather than a mechanical fix. Option A: accept the 1-ulp window where a contract validated under v0 can sit exactly at its cap under v1 (any version gate on evaluation implies this, and the degenerate shape only affects that contract's own emission). Option B: re-validate or clamp at claim time under the current version, which adds a consensus check on the payout path. This is now concrete since 8d4afc8 activates version 1 at PLATFORM_V14.
🤖 Posted autonomously by Claude on behalf of pasta.
| start_from_moment_for_distribution, | ||
| max_cycle_moment, | ||
| None, | ||
| platform_version, |
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Activation retroactively re-prices historical cycles. rewards_in_interval walks every cycle from the last-paid moment (bounded by max redemption cycles) and evaluates each with the platform version active at claim time, not at the cycle's own moment. At the v0→v1 flip, two identities with identical distributions and identical unclaimed pre-fork cycles get different totals depending solely on whether they claim one block before or after activation (e.g. a Polynomial{m:1,n:3} cycle paying 5 under std powf and 4 under libm, or vice versa). Realized emission for a fixed historical range stops being a function of the range.
This may be an acceptable trade-off (per-moment gating would require threading the moment→version mapping through here), but it changes already-accrued rewards and deserves an explicit decision in the PR description / activation plan rather than being implicit.
🤖 Posted autonomously by Claude on behalf of pasta.
| start_from_moment_for_distribution, | ||
| max_cycle_moment, | ||
| None, | ||
| platform_version, |
There was a problem hiding this comment.
Activation will retroactively re-price already-accrued cycles. rewards_in_interval walks every unclaimed cycle from the last-paid moment (bounded only by max redemption cycles) and evaluates each one with the platform version active at claim time, not at the cycle's own moment. When distribution_function_evaluate_version flips 0→1, two identities with identical pre-fork accrual get different totals depending on whether they claim before or after activation (e.g. the Polynomial{m:1,n:3} boundary case pays 5/cycle under libm where std paid 4). If that's acceptable, it's worth stating in the activation PR; if not, the version used per cycle would need to derive from the cycle's moment rather than the claim's.
🤖 Posted autonomously by Claude on behalf of pasta.
| max_value: *max_value, | ||
| } | ||
| .evaluate(0, start_moment)?; | ||
| .evaluate(0, start_moment, platform_version)?; |
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Registration-time validation and payout evaluation can disagree across the activation boundary. These coherence checks (e.g. rejecting a contract whose start_token_amount already sits at max_value) run once, at registration, with the version active then; payout runs forever with the version active at claim time. A contract validated pre-activation whose std-powf start value is one ulp below max_value can, post-activation, evaluate to exactly max_value under libm — the precise degenerate shape this check exists to reject, now permanently on-chain. Probably acceptable (the divergence window is 1 ulp), but worth a conscious decision in the activation PR rather than an accident.
🤖 Posted autonomously by Claude on behalf of pasta.
| max_value: *max_value, | ||
| } | ||
| .evaluate(0, start_moment)?; | ||
| .evaluate(0, start_moment, platform_version)?; |
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Registration-time validation and payout evaluation can disagree across the activation boundary. These coherence checks (e.g. rejecting a contract whose start_token_amount already sits at max_value) now evaluate with whatever version is active at registration. A contract registered pre-activation whose v0 (powf) start value is one ulp below max_value passes validation; post-activation, v1 (pow) can put the same contract exactly at max_value from cycle 0 — the degenerate shape this check exists to reject — and it is permanently on-chain with no re-validation. Probably acceptable (any version gate on evaluation implies this), but worth stating as a known consequence, since validation runs once and evaluation runs forever.
🤖 Posted autonomously by Claude on behalf of pasta.
DistributionFunction::evaluate() uses f64 transcendental functions (pow/exp/log) to compute consensus-critical token rewards. The std implementations are platform-dependent, risking consensus divergence between nodes with different architectures or libm versions. Gate these operations behind distribution_function_evaluate_version in DPPTokenVersions. Version 0 preserves the original std behavior (.powf/.exp/.ln) for existing protocol versions. Version 1+ uses deterministic libm functions for cross-platform consistency. Changes: - Add distribution_function_evaluate_version field to DPPTokenVersions - Create TOKEN_VERSIONS_V3 with deterministic evaluation enabled - Add libm 0.2 dependency to rs-dpp - Thread platform_version through evaluate() -> evaluate_interval() -> rewards_in_interval() call chain - Version-gate 4 transcendental call sites: Polynomial (pow), Exponential (exp), Logarithmic (log), InvertedLogarithmic (log) - Add determinism regression tests for all 4 affected variants
Replace wildcard libm dispatch with explicit version arms (0/1) ending in UnknownVersionMismatch across all four evaluate.rs call sites. Fix a misleading determinism-test comment and document that TOKEN_VERSIONS_V3 has no PlatformVersion consumer yet.
The added platform_version argument pushed 44 hunks in evaluate.rs, evaluate_interval.rs and the drive-abci block_based tests past 100 columns, which failed CI at the fmt gate before any Rust test ran. Also allow clippy::too_many_arguments on evaluate_interval_with_explanation (now 8 args) so the -D warnings clippy step passes, and import PlatformVersion in the drive-abci inverted_logarithmic test module, which the rebase onto v4.2-dev left without it. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
The v1 evaluation path exists so that every node computes bit-identical rewards, and libm 0.2.x patch releases have changed pow/exp/log. A caret range lets a refreshed lockfile or a downstream consumer resolve a different implementation, re-creating the divergence through Cargo resolution instead of the OS libm. Cargo.lock already resolves 0.2.16, so this is a manifest-only change. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
The 15-line version dispatch was copy-pasted into the Polynomial, Exponential, Logarithmic and InvertedLogarithmic arms, each with its own known_versions literal, and the integer-only variants never checked the version at all. Select a FloatOps { pow, exp, ln } table once at the top of evaluate() from a single KNOWN_EVALUATE_VERSIONS constant, so an unknown version is rejected uniformly for every variant and a future version is one edit.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
The Logarithmic arm's six overflow error strings said InvertedLogarithmic, a copy-paste from the real InvertedLogarithmic arm, so an overflow from either branch was indistinguishable in logs. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
…known-version path Baseline tests now run under an explicit evaluation version 0 instead of PlatformVersion::latest(), so their expectations do not silently move when latest() does. Add a regression test that every DistributionFunction variant fails closed with UnknownVersionMismatch on an unknown version, and a fixture test evaluating the drive-abci block-based inverted-log and polynomial shapes under both v0 and v1 so the size of the std -> libm change is pinned rather than implicit. Rewrite the 125^(1/3) boundary test comment: the exponent rounds below 1/3, so the exact value is 4.99999999999999955... and a correctly-rounded pow returns 4.999999999999999 (truncating to 4); libm 0.2.16 returning exactly 5.0 is the implementation this test locks in as the consensus answer, not the mathematically closer one. The v0 result is only sanity-checked as 4 or 5 since it is platform-dependent by construction. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
…protocol v14 TOKEN_VERSIONS_V3 (distribution_function_evaluate_version 1) had no consumer, so the fix shipped inert: every reachable PlatformVersion, including latest(), still took the std powf/exp/ln path. Wire it into PLATFORM_V14, the next unreleased protocol version on v4.2-dev, document it as the sixth v14 consensus change, and add a test pinning v13 at version 0 and v14 at version 1 so the activation cannot be silently lost. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Inline comments:
In
`@packages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/evaluate_interval.rs`:
- Line 1573: In both interval evaluation methods around the signatures at
evaluate_interval.rs lines 1573-1573 and 1722-1722, validate
distribution_function_evaluate_version immediately on entry before any
FixedAmount, explanation-path, or empty-interval early return, matching
DistributionFunction::evaluate behavior.
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packages/rs-dpp/Cargo.tomlpackages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/evaluate.rspackages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/evaluate_interval.rspackages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/validation.rspackages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/reward_distribution_type/evaluate_interval.rspackages/rs-drive-abci/src/execution/validation/state_transition/state_transitions/batch/tests/token/distribution/perpetual/block_based.rspackages/rs-drive/src/state_transition_action/batch/batched_transition/token_transition/token_claim_transition_action/v0/transformer.rspackages/rs-platform-version/src/version/dpp_versions/dpp_token_versions/mod.rspackages/rs-platform-version/src/version/dpp_versions/dpp_token_versions/v1.rspackages/rs-platform-version/src/version/dpp_versions/dpp_token_versions/v2.rspackages/rs-platform-version/src/version/dpp_versions/dpp_token_versions/v3.rspackages/rs-platform-version/src/version/v14.rs
🚧 Files skipped from review as they are similar to previous changes (9)
- packages/rs-platform-version/src/version/dpp_versions/dpp_token_versions/v1.rs
- packages/rs-platform-version/src/version/dpp_versions/dpp_token_versions/v2.rs
- packages/rs-platform-version/src/version/dpp_versions/dpp_token_versions/v3.rs
- packages/rs-platform-version/src/version/dpp_versions/dpp_token_versions/mod.rs
- packages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/reward_distribution_type/evaluate_interval.rs
- packages/rs-dpp/Cargo.toml
- packages/rs-drive/src/state_transition_action/batch/batched_transition/token_transition/token_claim_transition_action/v0/transformer.rs
- packages/rs-drive-abci/src/execution/validation/state_transition/state_transitions/batch/tests/token/distribution/perpetual/block_based.rs
- packages/rs-dpp/src/data_contract/associated_token/token_perpetual_distribution/distribution_function/validation.rs
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Assert v0 == v1 on the inverted-log fixtures instead of pinning platform-dependent v0 values, drop the perfect-square Polynomial fixture that could never diverge, make the all-variants unknown-version test fail to compile when a variant is added, and remove an unused Copy derive on FloatOps. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Follow-up 09edb90 (after the review pass on the commits above): the fixture test now asserts v0 == v1 on the inverted-log shapes instead of pinning platform-dependent v0 values, the perfect-square Polynomial fixture that could never diverge is dropped, the all-variants unknown-version test fails to compile if a variant is added, and an unused Copy derive on FloatOps is removed. fmt, clippy (-D warnings), and the 491 dpp distribution tests are still green. Not done, flagged for a maintainer: block_based.rs pins its inverted-log values via PlatformVersion::latest(), which is now v14 (evaluation version 1), so drive-abci-level coverage of the v0 replay path moved to the dpp fixture test; pinning one block_based case to an explicit pre-v14 version would restore it. 🤖 Posted autonomously by Claude on behalf of pasta. |
evaluate() rejects an unknown distribution_function_evaluate_version before dispatch, but evaluate_interval and evaluate_interval_with_explanation return Ok early for FixedAmount and for empty intervals without ever calling it, so an unsupported version succeeded or failed depending on distribution type and bounds. Factor the check into check_evaluate_version, used by FloatOps::for_version and now called at the entry of both interval methods before any early return. Test covers both fast paths through both entry points. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
3 participants
Issue being fixed or feature implemented
DistributionFunction::evaluate()uses f64 transcendental functions (powf/exp/ln) to compute consensus-critical token rewards. The std implementations are platform-dependent (varying across CPU architectures and libm versions), risking consensus divergence between nodes computing different integer rewards for the same claim.Concrete proof:
125^(1/3)yields 4 on some platforms (stdpowf) vs 5 on others. The deterministiclibmpath always returns 5.What was done?
Gate transcendental float operations behind
distribution_function_evaluate_versioninDPPTokenVersions:.powf(),.exp(),.ln())libmfunctions (pow,exp,log)Changes:
distribution_function_evaluate_versionfield toDPPTokenVersionsTOKEN_VERSIONS_V3with deterministic evaluation enabled (for use in a future protocol version)libm = "0.2"dependency to rs-dppplatform_versionthroughevaluate()→evaluate_interval()→rewards_in_interval()call chainpow), Exponential (exp), Logarithmic (log), InvertedLogarithmic (log)Note:
TOKEN_VERSIONS_V3is created but not yet assigned to a platform version. A future PR creatingPLATFORM_V13should reference it to activate deterministic evaluation on the network.How Has This Been Tested?
evaluate()unit tests pass (47 existing + 3 new determinism tests)validation.rstests passevaluate_intervaltests pass (withtoken-reward-explanationsfeature)distribution_function_evaluate_version = 1cargo check -p dpp -p drivecompiles cleanBreaking Changes
Function signature changes (compile-time only, no behavioral change for existing protocol versions):
DistributionFunction::evaluate()now requiresplatform_version: &PlatformVersionDistributionFunction::evaluate_interval()now requiresplatform_version: &PlatformVersionRewardDistributionType::rewards_in_interval()now requiresplatform_version: &PlatformVersionChecklist:
Summary by CodeRabbit
New Features
Improvements