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4meta5
2023-12-15 16:46:28 -05:00
parent 795b63e686
commit a461a7d959
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docs/modules/ROOT/pages/pallet_transaction_payment.adoc
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@@ -8,16 +8,18 @@
`pallet-transaction-payment` implements transaction fee logic. `pallet-transaction-payment` implements transaction fee logic.
To implement this pallet, the runtime configures a mapping between the minimum unit of computation/block space (*Weight*) and the minimum unit of fees ([`Config::WeightToFee`]). In substrate, every transaction has an associated `pallet::call`, and each `pallet::call` has a weight function. The weight function estimates the time it takes to execute the call.
This pallet also exposes [`Config::WeightToFee`] is set to a mapping between the smallest unit of compute (*Weight*) and smallest unit of fee.
The pallet also exposes
- how to update fees for the next block based on past fees ([`Config::FeeMultiplierUpdate`]). - how to update fees for the next block based on past fees ([`Config::FeeMultiplierUpdate`]).
- how fees are paid ([`Config::OnChargeTransaction`]). - how fees are paid ([`Config::OnChargeTransaction`]).
The base fee and adjusted weight and length fees constitute the _inclusion fee_, which is The base fee and adjusted weight and length fees constitute the _inclusion fee_, which is
the minimum fee for a transaction to be included in a block. the minimum fee for a transaction to be included in a block.
The formula of final fee: The formula of final fee:
```ignore ```rust,ignore
inclusion_fee = base_fee + length_fee + [targeted_fee_adjustment * weight_fee]; inclusion_fee = base_fee + length_fee + [targeted_fee_adjustment * weight_fee];
final_fee = inclusion_fee + tip; final_fee = inclusion_fee + tip;
``` ```
@@ -37,7 +39,7 @@ chance to be included by the transaction queue.
== config == config
- [`Config::WeightToFee`]: The mapping between one unit of weight to one unit of fee. - [`Config::WeightToFee`]: mapping between the smallest unit of weight and smallest unit of fee
- [`Config::FeeMultiplierUpdate`]: A means of updating the fee for the next block, via defining a multiplier, based on the - [`Config::FeeMultiplierUpdate`]: A means of updating the fee for the next block, via defining a multiplier, based on the
final state of the chain at the end of the previous block. Possible values include `ConstantFee`, SlowAdjustingFee`, FastAdjustingFee`, etc. final state of the chain at the end of the previous block. Possible values include `ConstantFee`, SlowAdjustingFee`, FastAdjustingFee`, etc.
- [`Config::OnChargeTransaction`]: A means of defining the storage and state changes associated with paying transaction fees. - [`Config::OnChargeTransaction`]: A means of defining the storage and state changes associated with paying transaction fees.