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//! Implementation of [`EIP-7910`](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-7910.md).
use crate::{eip2935, eip4788, eip6110, eip7002, eip7251, eip7840::BlobParams};
use alloc::{
collections::BTreeMap,
string::{String, ToString},
};
use alloy_primitives::{Address, Bytes};
use core::{cmp::Ordering, convert::Infallible, fmt, str};
/// Response type for `eth_config`
#[derive(Clone, Debug, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[cfg_attr(feature = "serde", serde(rename_all = "camelCase"))]
pub struct EthConfig {
/// Fork configuration of the current active fork.
pub current: EthForkConfig,
/// Fork configuration of the next scheduled fork.
pub next: Option<EthForkConfig>,
/// Fork configuration of the last fork (before current).
pub last: Option<EthForkConfig>,
}
/// The fork configuration object as defined by [`EIP-7910`](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-7910.md).
#[derive(Clone, Debug, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[cfg_attr(feature = "serde", serde(rename_all = "camelCase"))]
pub struct EthForkConfig {
/// The fork activation timestamp, represented as a JSON number in Unix epoch seconds (UTC).
/// For the "current" configuration, this reflects the actual activation time; for "next," it
/// is the scheduled time. Activation time is required. If a fork is activated at genesis
/// the value `0` is used. If the fork is not scheduled to be activated or its activation time
/// is unknown it should not be in the rpc results.
pub activation_time: u64,
/// The blob configuration parameters for the specific fork, as defined in the genesis file.
/// This is a JSON object with three members — `baseFeeUpdateFraction`, `max`, and `target` —
/// all represented as JSON numbers.
pub blob_schedule: BlobParams,
/// The chain ID of the current network, presented as a string with an unsigned 0x-prefixed
/// hexadecimal number, with all leading zeros removed. This specification does not support
/// chains without a chain ID or with a chain ID of zero.
///
/// For purposes of canonicalization this value must always be a string.
#[cfg_attr(feature = "serde", serde(with = "alloy_serde::quantity"))]
pub chain_id: u64,
/// The `FORK_HASH` value as specified in [EIP-6122](https://eips.ethereum.org/EIPS/eip-6122) of the specific fork,
/// presented as an unsigned 0x-prefixed hexadecimal numbers, with zeros left padded to a four
/// byte length, in lower case.
pub fork_id: Bytes,
/// A representation of the active precompile contracts for the fork. If a precompile is
/// replaced by an on-chain contract, or removed, then it is not included.
///
/// This is a JSON object where the members are the 20-byte 0x-prefixed hexadecimal addresses
/// of the precompiles (with zeros preserved), and the values are agreed-upon names for each
/// contract, typically specified in the EIP defining that contract.
///
/// For Cancun, the contract names are (in order): `ECREC`, `SHA256`, `RIPEMD160`, `ID`,
/// `MODEXP`, `BN256_ADD`, `BN256_MUL`, `BN256_PAIRING`, `BLAKE2F`, `KZG_POINT_EVALUATION`.
///
/// For Prague, the added contracts are (in order): `BLS12_G1ADD`, `BLS12_G1MSM`,
/// `BLS12_G2ADD`, `BLS12_G2MSM`, `BLS12_PAIRING_CHECK`, `BLS12_MAP_FP_TO_G1`,
/// `BLS12_MAP_FP2_TO_G2`.
pub precompiles: BTreeMap<String, Address>,
/// A JSON object representing system-level contracts relevant to the fork, as introduced in
/// their defining EIPs. Keys are the contract names (e.g., BEACON_ROOTS_ADDRESS) from the
/// first EIP where they appeared, sorted alphabetically. Values are 20-byte addresses in
/// 0x-prefixed hexadecimal form, with leading zeros preserved. Omitted for forks before
/// Cancun.
///
/// For Cancun the only system contract is `BEACON_ROOTS_ADDRESS`.
///
/// For Prague the system contracts are (in order) `BEACON_ROOTS_ADDRESS`,
/// `CONSOLIDATION_REQUEST_PREDEPLOY_ADDRESS`, `DEPOSIT_CONTRACT_ADDRESS`,
/// `HISTORY_STORAGE_ADDRESS`, and `WITHDRAWAL_REQUEST_PREDEPLOY_ADDRESS`.
///
/// Future forks MUST define the list of system contracts in their meta-EIPs.
pub system_contracts: BTreeMap<SystemContract, Address>,
}
/// System-level contracts for [`EthForkConfig`].
#[derive(PartialEq, Eq, Clone, Debug)]
#[cfg_attr(feature = "serde", derive(serde_with::SerializeDisplay, serde_with::DeserializeFromStr))]
pub enum SystemContract {
/// Beacon roots system contract.
BeaconRoots,
/// Consolidation requests predeploy system contract.
ConsolidationRequestPredeploy,
/// Deposit system contract.
DepositContract,
/// History storage system contract.
HistoryStorage,
/// Withdrawal requests predeploy system contract.
WithdrawalRequestPredeploy,
/// A custom system contract not defined by a known EIP.
Other(String),
}
impl PartialOrd for SystemContract {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl Ord for SystemContract {
fn cmp(&self, other: &Self) -> Ordering {
self.to_string().cmp(&other.to_string())
}
}
impl fmt::Display for SystemContract {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let str = match self {
Self::BeaconRoots => "BEACON_ROOTS",
Self::ConsolidationRequestPredeploy => "CONSOLIDATION_REQUEST_PREDEPLOY",
Self::DepositContract => "DEPOSIT_CONTRACT",
Self::HistoryStorage => "HISTORY_STORAGE",
Self::WithdrawalRequestPredeploy => "WITHDRAWAL_REQUEST_PREDEPLOY",
Self::Other(name) => return write!(f, "{name}"),
};
write!(f, "{str}_ADDRESS")
}
}
impl str::FromStr for SystemContract {
type Err = Infallible;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let system_contract = match s {
"BEACON_ROOTS_ADDRESS" => Self::BeaconRoots,
"CONSOLIDATION_REQUEST_PREDEPLOY_ADDRESS" => Self::ConsolidationRequestPredeploy,
"DEPOSIT_CONTRACT_ADDRESS" => Self::DepositContract,
"HISTORY_STORAGE_ADDRESS" => Self::HistoryStorage,
"WITHDRAWAL_REQUEST_PREDEPLOY_ADDRESS" => Self::WithdrawalRequestPredeploy,
_ => Self::Other(s.into()),
};
Ok(system_contract)
}
}
impl SystemContract {
/// Enumeration of all [`SystemContract`] variants.
pub const ALL: [Self; 5] = [
Self::BeaconRoots,
Self::ConsolidationRequestPredeploy,
Self::DepositContract,
Self::HistoryStorage,
Self::WithdrawalRequestPredeploy,
];
/// Returns Cancun system contracts.
pub const fn cancun() -> [(Self, Address); 1] {
[(Self::BeaconRoots, eip4788::BEACON_ROOTS_ADDRESS)]
}
/// Returns Prague system contracts.
/// Takes an optional deposit contract address. If it's `None`, mainnet deposit contract address
/// will be used instead.
pub fn prague(deposit_contract: Option<Address>) -> [(Self, Address); 4] {
[
(Self::HistoryStorage, eip2935::HISTORY_STORAGE_ADDRESS),
(Self::ConsolidationRequestPredeploy, eip7251::CONSOLIDATION_REQUEST_PREDEPLOY_ADDRESS),
(Self::WithdrawalRequestPredeploy, eip7002::WITHDRAWAL_REQUEST_PREDEPLOY_ADDRESS),
(
Self::DepositContract,
deposit_contract.unwrap_or(eip6110::MAINNET_DEPOSIT_CONTRACT_ADDRESS),
),
]
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn system_contract_str() {
assert_eq!(SystemContract::BeaconRoots.to_string(), "BEACON_ROOTS_ADDRESS");
assert_eq!(
SystemContract::ConsolidationRequestPredeploy.to_string(),
"CONSOLIDATION_REQUEST_PREDEPLOY_ADDRESS"
);
assert_eq!(SystemContract::DepositContract.to_string(), "DEPOSIT_CONTRACT_ADDRESS");
assert_eq!(SystemContract::HistoryStorage.to_string(), "HISTORY_STORAGE_ADDRESS");
assert_eq!(
SystemContract::WithdrawalRequestPredeploy.to_string(),
"WITHDRAWAL_REQUEST_PREDEPLOY_ADDRESS"
);
}
#[cfg(feature = "serde")]
#[test]
fn system_contract_serde_roundtrip() {
for contract in &SystemContract::ALL {
assert_eq!(
*contract,
serde_json::from_value::<SystemContract>(serde_json::to_value(contract).unwrap())
.unwrap()
);
}
}
#[cfg(feature = "serde")]
#[test]
fn hoodie_prague_eth_config() {
let raw = r#"
{
"activationTime": 1742999832,
"blobSchedule": {
"baseFeeUpdateFraction": 5007716,
"max": 9,
"target": 6
},
"chainId": "0x88bb0",
"forkId": "0x0929e24e",
"precompiles": {
"BLAKE2F": "0x0000000000000000000000000000000000000009",
"BLS12_G1ADD": "0x000000000000000000000000000000000000000b",
"BLS12_G1MSM": "0x000000000000000000000000000000000000000c",
"BLS12_G2ADD": "0x000000000000000000000000000000000000000d",
"BLS12_G2MSM": "0x000000000000000000000000000000000000000e",
"BLS12_MAP_FP2_TO_G2": "0x0000000000000000000000000000000000000011",
"BLS12_MAP_FP_TO_G1": "0x0000000000000000000000000000000000000010",
"BLS12_PAIRING_CHECK": "0x000000000000000000000000000000000000000f",
"BN254_ADD": "0x0000000000000000000000000000000000000006",
"BN254_MUL": "0x0000000000000000000000000000000000000007",
"BN254_PAIRING": "0x0000000000000000000000000000000000000008",
"ECREC": "0x0000000000000000000000000000000000000001",
"ID": "0x0000000000000000000000000000000000000004",
"KZG_POINT_EVALUATION": "0x000000000000000000000000000000000000000a",
"MODEXP": "0x0000000000000000000000000000000000000005",
"RIPEMD160": "0x0000000000000000000000000000000000000003",
"SHA256": "0x0000000000000000000000000000000000000002"
},
"systemContracts": {
"BEACON_ROOTS_ADDRESS": "0x000f3df6d732807ef1319fb7b8bb8522d0beac02",
"CONSOLIDATION_REQUEST_PREDEPLOY_ADDRESS": "0x0000bbddc7ce488642fb579f8b00f3a590007251",
"DEPOSIT_CONTRACT_ADDRESS": "0x00000000219ab540356cbb839cbe05303d7705fa",
"HISTORY_STORAGE_ADDRESS": "0x0000f90827f1c53a10cb7a02335b175320002935",
"WITHDRAWAL_REQUEST_PREDEPLOY_ADDRESS": "0x00000961ef480eb55e80d19ad83579a64c007002"
}
}
"#;
let fork_config = serde_json::from_str::<EthForkConfig>(raw).unwrap();
assert_eq!(
serde_json::to_string(&fork_config).unwrap(),
raw.chars().filter(|c| !c.is_whitespace()).collect::<String>()
);
}
}