System Config
Table of Contents
Overview
The SystemConfig is updated to allow for dynamic EIP-1559 parameters.
ConfigUpdate
The following ConfigUpdate event is defined where the CONFIG_VERSION is uint256(0):
| Name | Value | Definition | Usage |
|---|---|---|---|
BATCHER | uint8(0) | abi.encode(address) | Modifies the account that is authorized to progress the safe chain |
FEE_SCALARS | uint8(1) | (uint256(0x01) << 248) | (uint256(_blobbasefeeScalar) << 32) | _basefeeScalar | Modifies the fee scalars |
GAS_LIMIT | uint8(2) | abi.encode(uint64 _gasLimit) | Modifies the L2 gas limit |
UNSAFE_BLOCK_SIGNER | uint8(3) | abi.encode(address) | Modifies the account that is authorized to progress the unsafe chain |
EIP_1559_PARAMS | uint8(4) | (uint256(_denominator) << 32) | _elasticity | Modifies the EIP-1559 denominator and elasticity |
Initialization
The following actions should happen during the initialization of the SystemConfig:
emit ConfigUpdate.BATCHERemit ConfigUpdate.FEE_SCALARSemit ConfigUpdate.GAS_LIMITemit ConfigUpdate.UNSAFE_BLOCK_SIGNERemit ConfigUpdate.EIP_1559_PARAMS
Modifying EIP-1559 Parameters
A new SystemConfig UpdateType is introduced that enables the modification of
EIP-1559 parameters. This allows for the chain
operator to modify the BASE_FEE_MAX_CHANGE_DENOMINATOR and the ELASTICITY_MULTIPLIER.
Interface
EIP-1559 Params
setEIP1559Params
This function MUST only be callable by the chain governor.
function setEIP1559Params(uint32 _denominator, uint32 _elasticity)
The _denominator and _elasticity MUST be set to values greater to than 0.
It is possible for the chain operator to set EIP-1559 parameters that result in poor user experience.
eip1559Elasticity
This function returns the currently configured EIP-1559 elasticity.
function eip1559Elasticity()(uint32)
eip1559Denominator
This function returns the currently configured EIP-1559 denominator.
function eip1559Denominator()(uint32)