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Tidy BeaconStateBuilder struct

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This commit is contained in:
Paul Hauner 2019-03-10 12:56:57 +11:00
parent c33e299176
commit e99da31da8
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1 changed files with 4 additions and 149 deletions
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153
eth2/types/src/beacon_state/builder.rs
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@ -1,24 +1,14 @@
use super::BeaconStateError;
use crate::validator_registry::get_active_validator_indices;
use crate::*;
use crate::{validator_registry::get_active_validator_indices, *};
use bls::create_proof_of_possession;
use rayon::prelude::*;
use ssz::TreeHash;
/// Builds a `BeaconState` for use in testing or benchmarking.
/// Builds a `BeaconState` for use in production.
///
/// Building the `BeaconState` is a three step processes:
/// This struct should not be modified for use in testing scenarios. Use `TestingBeaconStateBuilder` for that purpose.
///
/// 1. Create a new `BeaconStateBuilder`.
/// 2. Call `Self::build()` or `Self::build_fast()` generate a `BeaconState`.
/// 3. (Optional) Use builder functions to modify the `BeaconState`.
/// 4. Call `Self::cloned_state()` to obtain a `BeaconState` cloned from this struct.
///
/// Step (2) happens prior to step (3) because some functionality requires an existing
/// `BeaconState`.
///
/// Step (4) produces a clone of the BeaconState and doesn't consume the `BeaconStateBuilder` to
/// allow access to `self.keypairs` and `self.spec`.
/// This struct should remain safe and sensible for production usage.
pub struct BeaconStateBuilder {
pub state: BeaconState,
}
@ -105,139 +95,4 @@ impl BeaconStateBuilder {
Ok(self.state)
}
/*
/// Sets the `BeaconState` to be in the last slot of the given epoch.
///
/// Sets all justification/finalization parameters to be be as "perfect" as possible (i.e.,
/// highest justified and finalized slots, full justification bitfield, etc).
pub fn teleport_to_end_of_epoch(&mut self, epoch: Epoch, spec: &ChainSpec) {
let state = &mut self.state;
let slot = epoch.end_slot(spec.slots_per_epoch);
state.slot = slot;
state.validator_registry_update_epoch = epoch - 1;
state.previous_shuffling_epoch = epoch - 1;
state.current_shuffling_epoch = epoch;
state.previous_shuffling_seed = Hash256::from_low_u64_le(0);
state.current_shuffling_seed = Hash256::from_low_u64_le(1);
state.previous_justified_epoch = epoch - 2;
state.justified_epoch = epoch - 1;
state.justification_bitfield = u64::max_value();
state.finalized_epoch = epoch - 1;
}
/// Creates a full set of attestations for the `BeaconState`. Each attestation has full
/// participation from its committee and references the expected beacon_block hashes.
///
/// These attestations should be fully conducive to justification and finalization.
pub fn insert_attestations(&mut self) {
let state = &mut self.state;
state
.build_epoch_cache(RelativeEpoch::Previous, &self.spec)
.unwrap();
state
.build_epoch_cache(RelativeEpoch::Current, &self.spec)
.unwrap();
let current_epoch = state.current_epoch(&self.spec);
let previous_epoch = state.previous_epoch(&self.spec);
let current_epoch_depth =
(state.slot - current_epoch.end_slot(self.spec.slots_per_epoch)).as_usize();
let previous_epoch_slots = previous_epoch.slot_iter(self.spec.slots_per_epoch);
let current_epoch_slots = current_epoch
.slot_iter(self.spec.slots_per_epoch)
.take(current_epoch_depth);
for slot in previous_epoch_slots.chain(current_epoch_slots) {
let committees = state
.get_crosslink_committees_at_slot(slot, &self.spec)
.unwrap()
.clone();
for (committee, shard) in committees {
state
.latest_attestations
.push(committee_to_pending_attestation(
state, &committee, shard, slot, &self.spec,
))
}
}
}
/// Returns a cloned `BeaconState`.
pub fn cloned_state(&self) -> BeaconState {
self.state.as_ref().expect("Genesis required").clone()
}
*/
}
/*
/// Builds a valid PendingAttestation with full participation for some committee.
fn committee_to_pending_attestation(
state: &BeaconState,
committee: &[usize],
shard: u64,
slot: Slot,
spec: &ChainSpec,
) -> PendingAttestation {
let current_epoch = state.current_epoch(spec);
let previous_epoch = state.previous_epoch(spec);
let mut aggregation_bitfield = Bitfield::new();
let mut custody_bitfield = Bitfield::new();
for (i, _) in committee.iter().enumerate() {
aggregation_bitfield.set(i, true);
custody_bitfield.set(i, true);
}
let is_previous_epoch =
state.slot.epoch(spec.slots_per_epoch) != slot.epoch(spec.slots_per_epoch);
let justified_epoch = if is_previous_epoch {
state.previous_justified_epoch
} else {
state.justified_epoch
};
let epoch_boundary_root = if is_previous_epoch {
*state
.get_block_root(previous_epoch.start_slot(spec.slots_per_epoch), spec)
.unwrap()
} else {
*state
.get_block_root(current_epoch.start_slot(spec.slots_per_epoch), spec)
.unwrap()
};
let justified_block_root = *state
.get_block_root(justified_epoch.start_slot(spec.slots_per_epoch), &spec)
.unwrap();
PendingAttestation {
aggregation_bitfield,
data: AttestationData {
slot,
shard,
beacon_block_root: *state.get_block_root(slot, spec).unwrap(),
epoch_boundary_root,
crosslink_data_root: Hash256::zero(),
latest_crosslink: Crosslink {
epoch: slot.epoch(spec.slots_per_epoch),
crosslink_data_root: Hash256::zero(),
},
justified_epoch,
justified_block_root,
},
custody_bitfield,
inclusion_slot: slot,
}
}
*/