feat(gas-keys): rosetta, prefetcher, mirror support for DelegateV2 (3/3)#15906
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Pull request overview
This PR completes the “gas-keys / DelegateV2” integration across Rosetta, the runtime trie prefetcher, and the mirror tool, ensuring DelegateV2 actions (including gas-key nonce indexing) round-trip correctly and are handled consistently across these subsystems.
Changes:
- Rosetta: carries
DelegateV2gas-keynonce_indexthrough operation metadata and reconstructsDelegateV2when present (with a bijection test). - Runtime prefetcher: adds deterministic prefetching for the gas-key per-index nonce row for
DelegateV2during receipt processing. - Mirror: maps and re-signs
DelegateV2actions while preserving the versioned nonce semantics via shared delegate mapping logic.
Reviewed changes
Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.
Show a summary per file
| File | Description |
|---|---|
| tools/mirror/src/genesis.rs | Adds DelegateV2 mapping/re-signing support and factors remapping into a shared map_delegate_action helper. |
| runtime/runtime/src/prefetch.rs | Prefetches DelegateV2 access keys and gas-key nonce rows when applicable. |
| chain/rosetta-rpc/src/models.rs | Extends operation metadata with nonce_index for gas-key DelegateV2 round-tripping. |
| chain/rosetta-rpc/src/adapters/validated_operations/delegate_action.rs | Threads nonce_index through delegate action operation encoding/decoding. |
| chain/rosetta-rpc/src/adapters/mod.rs | Extracts shared delegate operation building and adds DelegateV2 conversion + bijection test. |
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Adds a 2.13.0 changelog entry for the new `DelegateV2` meta-transaction action (`ProtocolFeature::DelegateV2`, protocol version 85), which lets gas keys ([NEP-611](near/NEPs#611)) sign relayed meta transactions. ([#15904](#15904), [#15905](#15905), [#15906](#15906)) Sorry I forgot this as part of the feature.
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Last PR of the stack (on top of #15905).
DelegateV2's nonce index inOperationMetadata::nonce_index, so it round-trips through operations and the NEAR Actions -> Operations -> NEAR Actions bijection holds (test included). ADelegateV2with a plain nonce reconstructs as the semantically equivalent plainDelegate. The shared operation-building logic is extracted intopush_delegate_action_operations.DelegateV2actions like plainDelegateones, preserving the versioned nonce; the shared remapping moves intomap_delegate_actionoverVersionedDelegateActionRefwith a per-versionresignclosure.