diff --git a/common/eth2_network_config/built_in_network_configs/gnosis/config.yaml b/common/eth2_network_config/built_in_network_configs/gnosis/config.yaml index 940fad361..18a08ed12 100644 --- a/common/eth2_network_config/built_in_network_configs/gnosis/config.yaml +++ b/common/eth2_network_config/built_in_network_configs/gnosis/config.yaml @@ -105,3 +105,4 @@ MESSAGE_DOMAIN_VALID_SNAPPY: 0x01000000 ATTESTATION_SUBNET_COUNT: 64 ATTESTATION_SUBNET_EXTRA_BITS: 0 ATTESTATION_SUBNET_PREFIX_BITS: 6 +ATTESTATION_SUBNET_SHUFFLING_PREFIX_BITS: 3 diff --git a/common/eth2_network_config/built_in_network_configs/holesky/config.yaml b/common/eth2_network_config/built_in_network_configs/holesky/config.yaml index 0bb72ebd8..1104791ed 100644 --- a/common/eth2_network_config/built_in_network_configs/holesky/config.yaml +++ b/common/eth2_network_config/built_in_network_configs/holesky/config.yaml @@ -105,6 +105,7 @@ ATTESTATION_SUBNET_COUNT: 64 ATTESTATION_SUBNET_EXTRA_BITS: 0 # ceillog2(ATTESTATION_SUBNET_COUNT) + ATTESTATION_SUBNET_EXTRA_BITS ATTESTATION_SUBNET_PREFIX_BITS: 6 +ATTESTATION_SUBNET_SHUFFLING_PREFIX_BITS: 3 # Deneb # `2**7` (=128) diff --git a/common/eth2_network_config/built_in_network_configs/mainnet/config.yaml b/common/eth2_network_config/built_in_network_configs/mainnet/config.yaml index ed96df291..019eda432 100644 --- a/common/eth2_network_config/built_in_network_configs/mainnet/config.yaml +++ b/common/eth2_network_config/built_in_network_configs/mainnet/config.yaml @@ -105,3 +105,4 @@ MESSAGE_DOMAIN_VALID_SNAPPY: 0x01000000 ATTESTATION_SUBNET_COUNT: 64 ATTESTATION_SUBNET_EXTRA_BITS: 0 ATTESTATION_SUBNET_PREFIX_BITS: 6 +ATTESTATION_SUBNET_SHUFFLING_PREFIX_BITS: 3 diff --git a/common/eth2_network_config/built_in_network_configs/prater/config.yaml b/common/eth2_network_config/built_in_network_configs/prater/config.yaml index 1928aeb30..ac94b6386 100644 --- a/common/eth2_network_config/built_in_network_configs/prater/config.yaml +++ b/common/eth2_network_config/built_in_network_configs/prater/config.yaml @@ -115,6 +115,7 @@ ATTESTATION_SUBNET_COUNT: 64 ATTESTATION_SUBNET_EXTRA_BITS: 0 # ceillog2(ATTESTATION_SUBNET_COUNT) + ATTESTATION_SUBNET_EXTRA_BITS ATTESTATION_SUBNET_PREFIX_BITS: 6 +ATTESTATION_SUBNET_SHUFFLING_PREFIX_BITS: 3 # Deneb # `2**7` (=128) diff --git a/common/eth2_network_config/built_in_network_configs/sepolia/config.yaml b/common/eth2_network_config/built_in_network_configs/sepolia/config.yaml index 33a5ccb3f..89b51ba76 100644 --- a/common/eth2_network_config/built_in_network_configs/sepolia/config.yaml +++ b/common/eth2_network_config/built_in_network_configs/sepolia/config.yaml @@ -104,6 +104,7 @@ ATTESTATION_SUBNET_COUNT: 64 ATTESTATION_SUBNET_EXTRA_BITS: 0 # ceillog2(ATTESTATION_SUBNET_COUNT) + ATTESTATION_SUBNET_EXTRA_BITS ATTESTATION_SUBNET_PREFIX_BITS: 6 +ATTESTATION_SUBNET_SHUFFLING_PREFIX_BITS: 3 # Deneb # `2**7` (=128) diff --git a/consensus/types/src/chain_spec.rs b/consensus/types/src/chain_spec.rs index b2120fb04..ebaec6370 100644 --- a/consensus/types/src/chain_spec.rs +++ b/consensus/types/src/chain_spec.rs @@ -189,6 +189,7 @@ pub struct ChainSpec { pub attestation_subnet_count: u64, pub attestation_subnet_extra_bits: u8, pub attestation_subnet_prefix_bits: u8, + pub attestation_subnet_shuffling_prefix_bits: u8, /* * Networking Deneb @@ -701,6 +702,8 @@ impl ChainSpec { message_domain_valid_snappy: default_message_domain_valid_snappy(), attestation_subnet_extra_bits: default_attestation_subnet_extra_bits(), attestation_subnet_prefix_bits: default_attestation_subnet_prefix_bits(), + attestation_subnet_shuffling_prefix_bits: + default_attestation_subnet_shuffling_prefix_bits(), max_request_blocks: default_max_request_blocks(), /* @@ -962,6 +965,8 @@ impl ChainSpec { message_domain_valid_snappy: default_message_domain_valid_snappy(), attestation_subnet_extra_bits: default_attestation_subnet_extra_bits(), attestation_subnet_prefix_bits: default_attestation_subnet_prefix_bits(), + attestation_subnet_shuffling_prefix_bits: + default_attestation_subnet_shuffling_prefix_bits(), max_request_blocks: default_max_request_blocks(), /* @@ -1139,6 +1144,9 @@ pub struct Config { #[serde(default = "default_attestation_subnet_prefix_bits")] #[serde(with = "serde_utils::quoted_u8")] attestation_subnet_prefix_bits: u8, + #[serde(default = "default_attestation_subnet_shuffling_prefix_bits")] + #[serde(with = "serde_utils::quoted_u8")] + attestation_subnet_shuffling_prefix_bits: u8, #[serde(default = "default_max_request_blocks_deneb")] #[serde(with = "serde_utils::quoted_u64")] max_request_blocks_deneb: u64, @@ -1236,6 +1244,10 @@ const fn default_attestation_subnet_prefix_bits() -> u8 { 6 } +const fn default_attestation_subnet_shuffling_prefix_bits() -> u8 { + 3 +} + const fn default_max_request_blocks() -> u64 { 1024 } @@ -1414,6 +1426,7 @@ impl Config { message_domain_valid_snappy: spec.message_domain_valid_snappy, attestation_subnet_extra_bits: spec.attestation_subnet_extra_bits, attestation_subnet_prefix_bits: spec.attestation_subnet_prefix_bits, + attestation_subnet_shuffling_prefix_bits: spec.attestation_subnet_shuffling_prefix_bits, max_request_blocks_deneb: spec.max_request_blocks_deneb, max_request_blob_sidecars: spec.max_request_blob_sidecars, min_epochs_for_blob_sidecars_requests: spec.min_epochs_for_blob_sidecars_requests, @@ -1474,6 +1487,7 @@ impl Config { message_domain_valid_snappy, attestation_subnet_extra_bits, attestation_subnet_prefix_bits, + attestation_subnet_shuffling_prefix_bits, max_request_blocks, epochs_per_subnet_subscription, attestation_propagation_slot_range, @@ -1531,6 +1545,7 @@ impl Config { message_domain_valid_snappy, attestation_subnet_extra_bits, attestation_subnet_prefix_bits, + attestation_subnet_shuffling_prefix_bits, max_request_blocks, epochs_per_subnet_subscription, attestation_propagation_slot_range, @@ -1817,6 +1832,7 @@ mod yaml_tests { check_default!(message_domain_valid_snappy); check_default!(attestation_subnet_extra_bits); check_default!(attestation_subnet_prefix_bits); + check_default!(attestation_subnet_shuffling_prefix_bits); assert_eq!(chain_spec.bellatrix_fork_epoch, None); } diff --git a/consensus/types/src/subnet_id.rs b/consensus/types/src/subnet_id.rs index 2752e3109..82e12b7ec 100644 --- a/consensus/types/src/subnet_id.rs +++ b/consensus/types/src/subnet_id.rs @@ -72,36 +72,43 @@ impl SubnetId { .into()) } - #[allow(clippy::arithmetic_side_effects)] /// Computes the set of subnets the node should be subscribed to during the current epoch, /// along with the first epoch in which these subscriptions are no longer valid. + #[allow(clippy::arithmetic_side_effects)] pub fn compute_subnets_for_epoch( node_id: ethereum_types::U256, epoch: Epoch, spec: &ChainSpec, ) -> Result<(impl Iterator, Epoch), &'static str> { - // Simplify the variable name + // simplify variable naming let subscription_duration = spec.epochs_per_subnet_subscription; + let prefix_bits = spec.attestation_subnet_prefix_bits as u64; + let shuffling_prefix_bits = spec.attestation_subnet_shuffling_prefix_bits as u64; - let node_id_prefix = - (node_id >> (256 - spec.attestation_subnet_prefix_bits as usize)).as_usize(); + // calculate the prefixes used to compute the subnet and shuffling + let node_id_prefix = (node_id >> (256 - prefix_bits)).as_u64(); + let shuffling_prefix = (node_id >> (256 - (prefix_bits + shuffling_prefix_bits))).as_u64(); - // NOTE: The as_u64() panics if the number is larger than u64::max_value(). This cannot be - // true as spec.epochs_per_subnet_subscription is a u64. - let node_offset = (node_id % ethereum_types::U256::from(subscription_duration)).as_u64(); + // number of groups the shuffling creates + let shuffling_groups = 1 << shuffling_prefix_bits; + // shuffling group for this node + let shuffling_bits = shuffling_prefix % shuffling_groups; + let epoch_transition = (node_id_prefix + + (shuffling_bits * (subscription_duration >> shuffling_prefix_bits))) + % subscription_duration; // Calculate at which epoch this node needs to re-evaluate let valid_until_epoch = epoch.as_u64() + subscription_duration - .saturating_sub((epoch.as_u64() + node_offset) % subscription_duration); + .saturating_sub((epoch.as_u64() + epoch_transition) % subscription_duration); - let subscription_event_idx = (epoch.as_u64() + node_offset) / subscription_duration; + let subscription_event_idx = (epoch.as_u64() + epoch_transition) / subscription_duration; let permutation_seed = ethereum_hashing::hash(&int_to_bytes::int_to_bytes8(subscription_event_idx)); let num_subnets = 1 << spec.attestation_subnet_prefix_bits; let permutated_prefix = compute_shuffled_index( - node_id_prefix, + node_id_prefix as usize, num_subnets, &permutation_seed, spec.shuffle_round_count, @@ -180,38 +187,33 @@ mod tests { "60930578857433095740782970114409273483106482059893286066493409689627770333527", "103822458477361691467064888613019442068586830412598673713899771287914656699997", ] - .into_iter() - .map(|v| ethereum_types::U256::from_dec_str(v).unwrap()) - .collect::>(); + .map(|v| ethereum_types::U256::from_dec_str(v).unwrap()); let epochs = [ 54321u64, 1017090249, 1827566880, 846255942, 766597383, 1204990115, 1616209495, 1774367616, 1484598751, 3525502229, ] - .into_iter() - .map(Epoch::from) - .collect::>(); + .map(Epoch::from); // Test mainnet let spec = ChainSpec::mainnet(); // Calculated by hand - let expected_valid_time: Vec = [ - 54528, 1017090371, 1827567108, 846256076, 766597570, 1204990135, 1616209582, - 1774367723, 1484598953, 3525502371, - ] - .into(); + let expected_valid_time = [ + 54528u64, 1017090255, 1827567030, 846256049, 766597387, 1204990287, 1616209536, + 1774367857, 1484598847, 3525502311, + ]; // Calculated from pyspec - let expected_subnets = vec![ + let expected_subnets = [ vec![4u64, 5u64], - vec![61, 62], - vec![23, 24], + vec![31, 32], + vec![39, 40], vec![38, 39], vec![53, 54], - vec![39, 40], + vec![57, 58], vec![48, 49], - vec![39, 40], + vec![1, 2], vec![34, 35], vec![37, 38], ]; @@ -228,11 +230,11 @@ mod tests { >(node_ids[x], epochs[x], &spec) .unwrap(); - assert_eq!(Epoch::from(expected_valid_time[x]), valid_time); assert_eq!( expected_subnets[x], computed_subnets.map(SubnetId::into).collect::>() ); + assert_eq!(Epoch::from(expected_valid_time[x]), valid_time); } } } diff --git a/lighthouse/environment/tests/testnet_dir/config.yaml b/lighthouse/environment/tests/testnet_dir/config.yaml index dbb6819cd..86f4dce23 100644 --- a/lighthouse/environment/tests/testnet_dir/config.yaml +++ b/lighthouse/environment/tests/testnet_dir/config.yaml @@ -97,3 +97,4 @@ MESSAGE_DOMAIN_VALID_SNAPPY: 0x01000000 ATTESTATION_SUBNET_COUNT: 64 ATTESTATION_SUBNET_EXTRA_BITS: 0 ATTESTATION_SUBNET_PREFIX_BITS: 6 +ATTESTATION_SUBNET_SHUFFLING_PREFIX_BITS: 3