Add account key base asset transfer support.

[Neopallium]

changelog

new features

• Add support for account based asset transfers.

new external API

• Added extrinsics transfer_asset and receiver_affirm_asset_transfer to the Asset pallet.

new events

• Added events Transferred { asset_id: AssetId, from: AccountId, to: AccountId, amount: u128, memo: Option<Memo> } and TransferPending { pending_transfer_id: PendingTransferId, asset_id: AssetId, from: AccountId, to: AccountId, amount: u128, memo: Option<Memo> } to the Assets pallet.

[Copilot]

Pull request overview

This PR adds support for account-based asset transfers by introducing new extrinsics transfer_asset and receiver_affirm_asset_transfer to the Asset pallet. The implementation leverages the settlement engine to handle transfers between default portfolios, with support for receiver affirmations when required.

Key changes include:

• New settlement trait (SettlementFnTrait) providing a unified interface for asset and NFT transfers
• Modified WeightMeter::from_limit API to auto-adjust limits instead of returning errors
• New pending transfer storage and events for tracking transfers awaiting receiver affirmation

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
primitives/src/weight_meter.rs	Changed from_limit to return Self instead of Result, auto-adjusting limit when below minimum
primitives/src/traits/settlement.rs	New trait defining settlement functions for transferring fungible and non-fungible assets
primitives/src/traits.rs	Added exports for the new settlement trait module
pallets/weights/src/pallet_asset.rs	Added weight functions for the new transfer extrinsics
pallets/settlement/src/lib.rs	Implemented SettlementFnTrait, added new error type, and updated weight meter validation
pallets/runtime/common/src/runtime.rs	Configured the Asset pallet to use the Settlement pallet for transfers
pallets/asset/src/lib.rs	Added new extrinsics, events, storage, and implementation for account-based asset transfers
pallets/asset/src/benchmarking.rs	Added benchmarks for new transfer functions and updated existing benchmarks with new parameter
pallets/sto/src/benchmarking.rs	Updated benchmark calls with new move_to_sender_portfolio parameter
pallets/settlement/src/benchmarking.rs	Updated benchmark calls with new move_to_sender_portfolio parameter

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