fix: emit generic metas as a rain meta document, not a bare cbor map - #272
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generate_emit_meta_calldata built emitMeta calldata whose meta was item.cbor_encode() — the bare cbor map, no 0xff0a89c674ee7874 prefix. IMetaBoardV1_2.emitMeta reverts NotRainMetaV1 on exactly that, so every call this function generated was unsubmittable. Closes #192 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Walkthrough
ChangesMetadata calldata validation
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The PR corrects the metadata wire format without introducing new runtime or security risk, but merge readiness is currently blocked by required legal metadata and formatting checks that fail on the changed files. Sequence Diagram(s)sequenceDiagram
participant RustTest
participant RustEncoder
participant Fixture
participant SolidityTest
participant TestMetaBoard
RustTest->>RustEncoder: generate emitMeta calldata
RustEncoder->>Fixture: write or compare encoded calldata
SolidityTest->>Fixture: read calldata case
SolidityTest->>TestMetaBoard: call emitMeta
TestMetaBoard-->>SolidityTest: emit MetaV1_2 event
SolidityTest->>SolidityTest: verify decoded event arguments
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Linked Issues checkExplanation The changes satisfy issue Full details: Docstring CoverageExplanation Docstring coverage is 88.89% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 2 files. (3 skipped: 3 unsupported.) ✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
📝 Generate docstrings
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The defect this branch fixes lived in the seam between the two halves of
the repo: rust builds `emitMeta` calldata, solidity decides whether it is
acceptable, and nothing tested the join. Both suites were green
throughout. `testEmitMetaNotRainMeta` proved the contract reverts on
unprefixed bytes; the rust test asserted the bytes were unprefixed;
neither knew about the other.
The assertion this branch already added pins the wire literal
`ff0a89c674ee7874` on the emitted calldata, which would have caught it -
but that is still two sides agreeing about a constant rather than the
contract being asked.
Now it is asked.
- `crates/cli/tests/emit_calldata_fixture.rs` writes the calldata rust
actually produces, for both producers, to
`test/fixtures/emit-calldata.json`. Run plain it asserts the committed
fixture still matches what the encoders emit, so the file cannot go
stale; `BLESS=1` regenerates it. Same shape as `CopyArtifacts.sol` and
the committed abis, checked by the same git-clean lane.
- `test/lib/EmitCalldataFixture.t.sol` reads that fixture and `call`s a
real `TestMetaBoard` with it, asserting the call succeeds, emits
exactly one `MetaV1_2`, and carries the calldata's own subject and meta
arguments back out of the log verbatim. What accepts the bytes is
`LibMeta.checkMetaUnhashedV1` rather than an assertion restating the
encoder.
Discriminating, measured: reverting `generate_emit_meta_calldata` to
`meta.cbor_encode()` - the bare cbor map this branch fixes - and
regenerating the fixture gives
[FAIL: metaboard rejected calldata for generic_item]
testGenericItemCalldataIsAcceptable
Suite result: FAILED. 1 passed; 1 failed
`dotrain_source` stays green under that mutation because it comes from
the other producer, which already prefixed correctly - so the two cases
are independent rather than redundant.
`foundry.toml` gains read access to `test/fixtures/`.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014RoHV66knQy6ya7NNkFLpK
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In `@test/fixtures/emit-calldata.json`:
- Line 1: Register emit-calldata.json in the repository’s REUSE metadata, adding
the required SPDX-FileCopyrightText and SPDX-License-Identifier entries without
modifying the JSON fixture content.
In `@test/lib/EmitCalldataFixture.t.sol`:
- Around line 49-50: Reformat the tuple assignment in the test so the full
assignment appears on one line, then run forge fmt to apply the repository’s
formatting.
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Fix all unresolved CodeRabbit comments on this PR:
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crates/cli/src/metaboard.rscrates/cli/tests/emit_calldata_fixture.rsfoundry.tomltest/fixtures/emit-calldata.jsontest/lib/EmitCalldataFixture.t.sol
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The previous commit claimed the fixture was "checked by the same
git-clean lane" as the committed abis. It was not. `git-clean.yaml`
delegates to rainix `rainix-copy-artifacts.yaml`, which runs forge
scripts and then `git diff --exit-code`; it never ran cargo, so it could
not have regenerated this fixture or seen it drift. Only the rust test's
own assertion caught staleness, in a different lane.
That workflow does have the hook for this, guarded on the file existing:
- name: Regenerate derived artifacts
if: hashFiles('script/build.sh') != ''
run: ./script/build.sh
`script/build.sh` now exists and blesses the fixture, so git-clean
regenerates it between the forge steps and the diff, exactly as it does
the abis. Change a producer without committing what it now emits and the
lane goes red.
Measured, not assumed: with `generate_emit_meta_calldata` reverted to
`meta.cbor_encode()`, `./script/build.sh` followed by
`git diff --exit-code -- test/fixtures/` exits non-zero. Restoring the
encoder and rerunning leaves it clean.
The rust test keeps its own assertion, so staleness now fails two lanes
rather than one.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014RoHV66knQy6ya7NNkFLpK
Both failures were mine, and both are about the two files the previous commits added rather than anything they do. `legal` (REUSE lint): `test/fixtures/emit-calldata.json` carried no copyright or licence, and json has no comment syntax to put SPDX tags in, so it is covered by a `test/fixtures/**/` entry in `REUSE.toml` the way the other generated trees are. `script/build.sh` is a shell script and takes the tags inline. `reuse lint` now reports 133/133 with copyright and licence, up from 132/133. `static` (`forge fmt --check`): the log decode in `EmitCalldataFixture.t.sol` was split across two lines where fmt wants one. The two fixture tests still pass against a real metaboard. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014RoHV66knQy6ya7NNkFLpK
`emit_calldata_fixture.rs` both wrote the fixture under `BLESS=1` and asserted it was current otherwise. The assert half was left over from before `script/build.sh` existed: once git-clean regenerates and diffs, the assertion checks the same fact in a second lane, and the env var only exists to switch between them. It is also not how this repo treats generated artifacts. The committed abis have no self-checking test - `CopyArtifacts.sol` writes them and `git diff --exit-code` decides. The calldata fixture now works the same way, as `crates/cli/examples/emit-calldata-fixture.rs`. Regenerating produces a byte identical fixture, so nothing about what solidity consumes changed. Drift is still caught, re-measured against the writer: with `generate_emit_meta_calldata` reverted to `meta.cbor_encode()`, `./script/build.sh` then `git diff --exit-code -- test/fixtures/` exits non-zero; restoring the encoder and rerunning leaves it clean. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014RoHV66knQy6ya7NNkFLpK
The pre-commit rustfmt hook only sees staged files, so a freshly added example passed locally while `cargo fmt --all -- --check` in the rs-static lane did not. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014RoHV66knQy6ya7NNkFLpK
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Closes #192.
The issue filed this "flagged, not adjudicated" — the sol half adjudicates it
#192 asks whether the bare-map framing might be deliberate for this API. It is
not, and the deciding fact is in this repo rather than only in the spec.
generate_emit_meta_calldatabuilds calldata forIMetaBoardV1_2.emitMeta(subject, meta). That entry point isLibIMetaBoardV1_2.emitMeta, whose whole body is:checkMetaUnhashedV1revertsNotRainMetaV1unless the first 8 bytes are0xff0a89c674ee7874(src/lib/LibMeta.sol), andIMetaBoardV1_2states it asa contract-level MUST: "
IMetaBoardV1_2contracts MUST revert any metadata thatdoes not start with the Rain metadata magic number."
So this was not a spec-vs-implementation ambiguity with two liveable answers.
Every calldata this function has ever produced reverts on any conforming
metaboard. There is no exemption to document — a "documented exemption" would
have documented a function that cannot be used for its stated purpose.
Two further in-repo oracles agree:
Store::store_content(crates/cli/src/meta/mod.rs) caches inner items onlyif bytes.starts_with(&KnownMagic::RainMetaDocumentV1.to_prefix_bytes())—this repo's own reader already discards unprefixed blobs, which is the spec
MUST generate_emit_meta_calldata emits meta bytes without the rain-meta-document-v1 magic prefix the metadata-v1 spec requires #192 quotes, implemented.
generate_dotrain_source_emit_tx_data, the sibling emit path, has alwaysprefixed.
Changes
crates/cli/src/metaboard.rsonly:generate_emit_meta_calldata's meta is nowcbor_encode_seq(&vec![meta], KnownMagic::RainMetaDocumentV1)instead ofmeta.cbor_encode(). A one-item cbor-seq under the magic — which is whathash(true)andgenerate_dotrain_source_emit_tx_dataalready build, so itintroduces no new framing.
test_generate_emit_meta_calldata_success's meta pin follows.test_emit_meta_bytes_are_a_rain_meta_document.What deliberately did NOT change: the subject
The subject stays
meta.hash(false)— keccak256 of the BARE cbor item. #192 isabout the meta bytes only, and the bare item hash is the key
Storeinsertsinner items under (
keccak256(meta_map.cbor_encode())instore_content), soit is the item's identity in this codebase rather than an arbitrary third
digest. That the subject and the emitted bytes are now over different preimages
looks like an inconsistency at a glance, so the docstring says it is on purpose;
that is the whole of the comment added.
Relation to #247 (
2026-08-25-issue-158)#247 touches the same module and no overlapping line. It changes only
generate_dotrain_source_emit_tx_data's subject (cbor item hash → contenthash) and leaves that path's meta bytes prefixed as they already were. This PR
changes only
generate_emit_meta_calldata's meta bytes and leaves itssubject alone. #247's body names the split itself: "the generic
generate_emit_meta_calldatastill keys onmeta.hash(false), which is adifferent question (#192)."
Both branch off the same
origin/main(45ca96c). Their metaboard.rs hunks aredisjoint — #247 rewrites the impl body of
generate_dotrain_source_emit_tx_dataand the tail of
test_generate_dotrain_source_emit_tx_data_success; this onerewrites the body of
generate_emit_meta_calldataand the head oftest_generate_emit_meta_calldata_success— so whichever merges second shouldmerge clean, and neither changes a value the other asserts.
Behaviour change
generate_emit_meta_calldataispuband re-exported at the crate root, sothis is wire-visible on a shipped library API: same input, different calldata,
8 bytes longer meta. Called out rather than buried. No in-org consumer exists —
gh search code "generate_emit_meta_calldata org:rainlanguage"returns thisrepo's own module and nothing else — and the previous output could not have been
successfully submitted anywhere, so no working caller can regress.
QA
metaboard::tests::test_emit_meta_bytes_are_a_rain_meta_document(new) and
metaboard::tests::test_generate_emit_meta_calldata_success(metapin rewritten) — each fails on base, verified by reverting only the impl hunk
in place (
let meta_bytes = meta.cbor_encode()?, tests untouched) andre-running: both FAILED, 8 passed / 2 failed. On the fixed tree
cargo test -p rain-metadata --lib metaboard::is 10 passed / 0 failed.crates/cli/src/metaboard.rslet meta_bytes = RainMetaDocumentV1Item::cbor_encode_seq(&vec![meta], crate::KnownMagic::RainMetaDocumentV1)?;→
let meta_bytes = meta.cbor_encode()?;(the original bug is the mutant) →killed by
test_emit_meta_bytes_are_a_rain_meta_document(
left: "a3004c7465737420", the bare cbor map header, vsright: "ff0a89c674ee7874") and bytest_generate_emit_meta_calldata_success(emitted meta 8 bytes short).KnownMagic::RainMetaDocumentV1→KnownMagic::DotrainSourceV1— prefixed but with the WRONG magic → killedby both (
left: "ffa15ef0fc437099"), so the new test pins the specificmagic and not merely "has some prefix".
in one file and the working tree is clean against it.
ff0a89c674ee7874asserted directly against the emittedbytes, not routed through
KnownMagic— the same constanttest/interface/MetaMagicNumberV1.t.solpins on the sol side, and the valuequoted in generate_emit_meta_calldata emits meta bytes without the rain-meta-document-v1 magic prefix the metadata-v1 spec requires #192 and in
rainprotocol/specsmetadata-v1.md. The new test alsoround-trips
cbor_decodeback to the original item and assertsemitted[8..] == meta.cbor_encode(), so the prefix is added and nothing elseis. The behavioural authority is
LibMeta.isRainMetaV1in this repo, which iswhat actually accepts or rejects the calldata.
rain-meta-document-v1 magic the spec requires, and (B) an explicit decision
between prefixing here too and documenting why this path is exempt. Covered A
by prefixing. Covered B by deciding, with the reason on the record: exempting
is not available, because
IMetaBoardV1_2.emitMeta— the only consumer ofthis calldata — reverts
NotRainMetaV1on unprefixed meta. generate_emit_meta_calldata emits meta bytes without the rain-meta-document-v1 magic prefix the metadata-v1 spec requires #192's own"possibly deliberate" hypotheses are both refuted: there is no wrapping
caller (no in-org consumer at all), and whether the subgraph checks the prefix
is moot since the event it indexes is never emitted. The subject question
generate_emit_meta_calldata emits meta bytes without the rain-meta-document-v1 magic prefix the metadata-v1 spec requires #192 does not ask is left alone and stated above.
CopyArtifactsor manifestcoupling is in play.
cargo fmt --all -- --checkandcargo clippy --workspace --all-targets -- -D warningsare both clean. Perthe task brief the wider suite is left to CI (~70 sibling agents on this box).
🤖 Generated with Claude Code
CI
rainix-rs / static / rs-staticfails on therustfmt-conditionalhook with"Failed to find targets" before it reads a single file. It fails the same way on
mainitself (45ca96c, 6fe2e2b, 9c65a23 allfailure) and on unrelated PRs,so it is a rainix hook bug and not this change. Every other lane is green.
Summary by CodeRabbit
Bug Fixes
Tests