Trait pallet_transaction_payment::pallet::DefaultConfig

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pub trait DefaultConfig: DefaultConfig {
    type RuntimeEvent;
    type FeeMultiplierUpdate: MultiplierUpdate;
    type OperationalFeeMultiplier: Get<u8>;
}
Expand description

Based on Config. Auto-generated by #[pallet::config(with_default)]. Can be used in tandem with #[register_default_config] and #[derive_impl] to derive test config traits based on existing pallet config traits in a safe and developer-friendly way.

See here for more information and caveats about the auto-generated DefaultConfig trait and how it is generated.

Required Associated Types§

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type RuntimeEvent

The overarching event type.

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type FeeMultiplierUpdate: MultiplierUpdate

Update the multiplier of the next block, based on the previous block’s weight.

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type OperationalFeeMultiplier: Get<u8>

A fee multiplier for Operational extrinsics to compute “virtual tip” to boost their priority

This value is multiplied by the final_fee to obtain a “virtual tip” that is later added to a tip component in regular priority calculations. It means that a Normal transaction can front-run a similarly-sized Operational extrinsic (with no tip), by including a tip value greater than the virtual tip.

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// For `Normal`
let priority = priority_calc(tip);

// For `Operational`
let virtual_tip = (inclusion_fee + tip) * OperationalFeeMultiplier;
let priority = priority_calc(tip + virtual_tip);

Note that since we use final_fee the multiplier applies also to the regular tip sent with the transaction. So, not only does the transaction get a priority bump based on the inclusion_fee, but we also amplify the impact of tips applied to Operational transactions.

Object Safety§

This trait is not object safe.

Implementors§