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feat(types): add Fulu cell dissemination SSZ types#284

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lodekeeper-z wants to merge 3 commits intoChainSafe:mainfrom
lodekeeper-z:feat/cell-dissemination-types
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feat(types): add Fulu cell dissemination SSZ types#284
lodekeeper-z wants to merge 3 commits intoChainSafe:mainfrom
lodekeeper-z:feat/cell-dissemination-types

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Add PartialDataColumnSidecar, PartialDataColumnPartsMetadata, and PartialDataColumnHeader types from consensus-specs #4558 (merged 2026-03-25).

These types support cell-level dissemination via Gossipsub partial messages, allowing individual cells to be sent instead of full data columns for more efficient data availability sampling.

New types

Type Description
PartialDataColumnSidecar Column sidecar with bitmap indicating which cells are present + optional header for eager pushes
PartialDataColumnPartsMetadata Bitmap pair (available/requests) for peer cell negotiation
PartialDataColumnHeader Header with KZG commitments, signed block header, and inclusion proof

Spec reference

🤖 Generated with AI assistance

Add PartialDataColumnSidecar, PartialDataColumnPartsMetadata, and
PartialDataColumnHeader types from consensus-specs #4558.

These types support cell-level dissemination via Gossipsub partial
messages, allowing individual cells to be sent instead of full data
columns for more efficient data availability sampling.

🤖 Generated with AI assistance
@lodekeeper-z lodekeeper-z requested a review from a team as a code owner March 27, 2026 05:36
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Summary of Changes

Hello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces new SSZ data structures required for the Fulu upgrade's cell dissemination mechanism. These types facilitate more efficient peer-to-peer data transmission by allowing for partial column communication rather than full data columns, aligning the codebase with the latest consensus specifications.

Highlights

  • New SSZ Types: Added PartialDataColumnSidecar, PartialDataColumnPartsMetadata, and PartialDataColumnHeader to support Fulu cell dissemination.
  • Spec Compliance: Implemented types based on consensus-specs PR #4558 to enable efficient data availability sampling.

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Code Review

This pull request introduces new SSZ container types for cell dissemination in src/consensus_types/fulu.zig, including PartialDataColumnSidecar, PartialDataColumnPartsMetadata, and PartialDataColumnHeader. Feedback focuses on adhering to the repository style guide, specifically ensuring that comments are formatted as complete sentences with proper punctuation and that line lengths do not exceed the 100-column limit.

Comment thread src/consensus_types/fulu.zig Outdated
row_index: RowIndex,
});

// Cell Dissemination types (consensus-specs #4558)
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medium

Per the repository style guide (line 304), comments on their own line should be complete sentences with proper capitalization and punctuation. This comment appears to be a section header; please rephrase it as a complete sentence.

// Defines types for cell dissemination (consensus-specs #4558).
References
  1. Comments should be formatted as complete sentences with proper capitalization and punctuation. (link)

Comment thread src/consensus_types/fulu.zig Outdated
cells_present_bitmap: ssz.BitListType(preset.MAX_BLOB_COMMITMENTS_PER_BLOCK),
partial_column: ssz.FixedListType(Cell, preset.MAX_BLOB_COMMITMENTS_PER_BLOCK),
kzg_proofs: ssz.FixedListType(p.KZGProof, preset.MAX_BLOB_COMMITMENTS_PER_BLOCK),
// Optional header, only sent on eager pushes
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medium

Per the repository style guide (line 304), comments on their own line should be complete sentences with proper capitalization and punctuation. Please update this comment to follow that rule.

// The header is optional and is only sent on eager pushes.
References
  1. Comments should be formatted as complete sentences with proper capitalization and punctuation. (link)

Comment thread src/consensus_types/fulu.zig Outdated
pub const PartialDataColumnHeader = ssz.VariableContainerType(struct {
kzg_commitments: ssz.FixedListType(p.KZGCommitment, preset.MAX_BLOB_COMMITMENTS_PER_BLOCK),
signed_block_header: SignedBeaconBlockHeader,
kzg_commitments_inclusion_proof: ssz.FixedVectorType(p.Bytes32, preset.KZG_COMMITMENTS_INCLUSION_PROOF_DEPTH),
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medium

This line exceeds the 100-column limit specified in the repository style guide (line 400). Please reformat it to adhere to the style guide. zig fmt should handle this automatically if you break the line inside the function call's arguments.

    kzg_commitments_inclusion_proof: ssz.FixedVectorType(
        p.Bytes32,
        preset.KZG_COMMITMENTS_INCLUSION_PROOF_DEPTH,
    ),
References
  1. All lines must be at most 100 columns long. To wrap a function signature, call or data structure, add a trailing comma and let zig fmt do the rest. (link)

From Fulu p2p-interface spec — used for DataColumnSidecarsByRoot requests.

🤖 Generated with AI assistance
- Rephrase section header as complete sentence
- Add proper punctuation to inline comment
- Break long line to stay within 100-column limit

🤖 Generated with AI assistance
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