add initial attestation validation structure
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@ -15,3 +15,4 @@ pub mod crosslink_record;
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pub mod shard_and_committee;
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pub mod transition;
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pub mod validator_record;
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pub mod validation;
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66
lighthouse/state/validation/attestation_validation.rs
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66
lighthouse/state/validation/attestation_validation.rs
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@ -0,0 +1,66 @@
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use super::super::crystallized_state::CrystallizedState;
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use super::super::active_state::ActiveState;
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use super::super::attestation_record::AttestationRecord;
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use super::super::block::Block;
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use super::super::chain_config::ChainConfig;
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use ::utils::errors::AttestationValidationError;
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// implementation of validate_attestation in the v2.1 python reference implementation
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// see: https://github.com/ethereum/beacon_chain/blob/a79ab2c6f03cbdabf2b6d9d435c26e2b216e09a5/beacon_chain/state/state_transition.py#L61
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pub fn validate_attestation(
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crystallized_state: &CrystallizedState,
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active_state: &ActiveState,
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attestation: &AttestationRecord,
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block: &Block,
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chain_config: &ChainConfig)
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-> Result<bool, AttestationValidationError> {
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if !(attestation.slot < block.slot_number) {
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return Err(AttestationValidationError::SlotTooHigh);
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}
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if !(attestation.slot > (block.slot_number - chain_config.cycle_length as u64)) {
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return Err(AttestationValidationError::SlotTooLow(format!("Attestation slot number too low\n\tFound: {:?}, Needed greater than: {:?}", attestation.slot, block.slot_number - chain_config.cycle_length as u64)));
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}
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return Ok(true);
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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// test helper functions
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fn generate_standard_state() -> (
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CrystallizedState,
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ActiveState,
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AttestationRecord,
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Block,
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ChainConfig) {
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let mut crystallized_state = CrystallizedState::zero();
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let mut active_state = ActiveState::zero();
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let mut attestation_record = AttestationRecord::zero();
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let mut block = Block::zero();
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let chain_config = ChainConfig::standard();
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return (crystallized_state, active_state, attestation_record, block, chain_config);
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}
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#[test]
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fn test_attestation_validation_slot_high() {
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// generate standard state
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let (mut crystallized_state, mut active_state, mut attestation_record, mut block, mut chain_config) = generate_standard_state();
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// set slot too high
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attestation_record.slot = 30;
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block.slot_number = 10;
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let result = validate_attestation(&crystallized_state, &active_state, &attestation_record, &block, &chain_config);
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assert_eq!(result, Err(AttestationValidationError::SlotTooHigh));
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}
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}
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1
lighthouse/state/validation/mod.rs
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1
lighthouse/state/validation/mod.rs
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@ -0,0 +1 @@
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mod attestation_validation;
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12
lighthouse/utils/errors.rs
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12
lighthouse/utils/errors.rs
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@ -0,0 +1,12 @@
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// Collection of custom errors
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#[derive(Debug,PartialEq)]
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pub enum AttestationValidationError {
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SlotTooHigh,
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SlotTooLow(String),
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IncorrectBitField,
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NonZeroTrailingBits,
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AggregateSignatureFail
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}
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@ -7,3 +7,4 @@ pub mod types;
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pub mod bls;
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pub mod test_helpers;
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pub mod logging;
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pub mod errors;
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