36 lines
1.1 KiB
Rust
36 lines
1.1 KiB
Rust
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use int_to_bytes::int_to_bytes8;
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use ssz::ssz_encode;
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use types::{AttestationData, BeaconState, ChainSpec, Domain, Epoch, EthSpec};
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/// Serialized `AttestationData` augmented with a domain to encode the fork info.
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#[derive(PartialEq, Eq, Clone, Hash, Debug)]
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pub struct AttestationId(Vec<u8>);
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/// Number of domain bytes that the end of an attestation ID is padded with.
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const DOMAIN_BYTES_LEN: usize = 8;
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impl AttestationId {
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pub fn from_data<T: EthSpec>(
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attestation: &AttestationData,
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state: &BeaconState<T>,
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spec: &ChainSpec,
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) -> Self {
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let mut bytes = ssz_encode(attestation);
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let epoch = attestation.target_epoch;
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bytes.extend_from_slice(&AttestationId::compute_domain_bytes(epoch, state, spec));
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AttestationId(bytes)
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}
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pub fn compute_domain_bytes<T: EthSpec>(
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epoch: Epoch,
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state: &BeaconState<T>,
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spec: &ChainSpec,
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) -> Vec<u8> {
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int_to_bytes8(spec.get_domain(epoch, Domain::Attestation, &state.fork))
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}
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pub fn domain_bytes_match(&self, domain_bytes: &[u8]) -> bool {
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&self.0[self.0.len() - DOMAIN_BYTES_LEN..] == domain_bytes
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}
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}
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