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Allow harness to produce fork blocks

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This commit is contained in:
Paul Hauner 2019-06-23 10:05:12 +10:00
parent e904e0a5a8
commit 8ed03e391d
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GPG Key ID: 303E4494BB28068C
1 changed files with 32 additions and 192 deletions
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224
beacon_node/beacon_chain/src/test_utils.rs
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@ -22,7 +22,12 @@ pub enum BlockStrategy {
/// Ignore the canonical head and produce blocks upon the block at the given slot.
///
/// Useful for simulating forks.
ForkCanonicalChainAt(Slot),
ForkCanonicalChainAt {
/// The slot of the parent of the first block produced.
previous_slot: Slot,
/// The slot of the first block produced (must be higher than `previous_slot`.
first_slot: Slot,
},
}
/// Indicates how the `BeaconChainHarness` should produce attestations.
@ -62,7 +67,7 @@ where
L: LmdGhost<MemoryStore, E>,
E: EthSpec,
{
chain: BeaconChain<CommonTypes<L, E>>,
pub chain: BeaconChain<CommonTypes<L, E>>,
keypairs: Vec<Keypair>,
spec: ChainSpec,
}
@ -130,29 +135,20 @@ where
block_strategy: BlockStrategy,
attestation_strategy: AttestationStrategy,
) {
// Get an initial state to build the block upon, based on the build strategy.
let mut state = match block_strategy {
BlockStrategy::OnCanonicalHead => self.chain.current_state().clone(),
BlockStrategy::ForkCanonicalChainAt(fork_slot) => {
let state_root = self
.chain
.rev_iter_state_roots(self.chain.head().beacon_state.slot - 1)
.find(|(_hash, slot)| *slot == fork_slot)
.map(|(hash, _slot)| hash)
.expect("could not find state root for fork");
let mut state = {
// Determine the slot for the first block (or skipped block).
let state_slot = match block_strategy {
BlockStrategy::OnCanonicalHead => self.chain.read_slot_clock().unwrap() - 1,
BlockStrategy::ForkCanonicalChainAt { previous_slot, .. } => previous_slot,
};
self.chain
.store
.get(&state_root)
.expect("should read db")
.expect("should find state root")
}
self.get_state_at_slot(state_slot)
};
// Get an initial slot to build upon, based on the build strategy.
// Determine the first slot where a block should be built.
let mut slot = match block_strategy {
BlockStrategy::OnCanonicalHead => self.chain.read_slot_clock().unwrap(),
BlockStrategy::ForkCanonicalChainAt(slot) => slot,
BlockStrategy::ForkCanonicalChainAt { first_slot, .. } => first_slot,
};
for _ in 0..num_blocks {
@ -175,7 +171,7 @@ where
slot,
);
} else {
panic!("block should be successfully processed");
panic!("block should be successfully processed: {:?}", outcome);
}
state = new_state;
@ -183,6 +179,21 @@ where
}
}
fn get_state_at_slot(&self, state_slot: Slot) -> BeaconState<E> {
let state_root = self
.chain
.rev_iter_state_roots(self.chain.current_state().slot)
.find(|(_hash, slot)| *slot == state_slot)
.map(|(hash, _slot)| hash)
.expect("could not find state root");
self.chain
.store
.get(&state_root)
.expect("should read db")
.expect("should find state root")
}
/// Returns a newly created block, signed by the proposer for the given slot.
fn build_block(
&self,
@ -322,174 +333,3 @@ where
&self.keypairs[validator_index].sk
}
}
#[cfg(test)]
// #[cfg(not(debug_assertions))]
mod test {
use super::*;
use lmd_ghost::ThreadSafeReducedTree;
use types::MinimalEthSpec;
// Should ideally be divisible by 3.
pub const VALIDATOR_COUNT: usize = 24;
fn get_harness(
validator_count: usize,
) -> BeaconChainHarness<ThreadSafeReducedTree<MemoryStore, MinimalEthSpec>, MinimalEthSpec>
{
let harness = BeaconChainHarness::new(validator_count);
// Move past the zero slot.
harness.advance_slot();
harness
}
#[test]
fn finalizes_with_full_participation() {
let num_blocks_produced = MinimalEthSpec::slots_per_epoch() * 5;
let harness = get_harness(VALIDATOR_COUNT);
harness.extend_chain(
num_blocks_produced as usize,
BlockStrategy::OnCanonicalHead,
AttestationStrategy::AllValidators,
);
let state = &harness.chain.head().beacon_state;
assert_eq!(
state.slot, num_blocks_produced,
"head should be at the current slot"
);
assert_eq!(
state.current_epoch(),
num_blocks_produced / MinimalEthSpec::slots_per_epoch(),
"head should be at the expected epoch"
);
assert_eq!(
state.current_justified_epoch,
state.current_epoch() - 1,
"the head should be justified one behind the current epoch"
);
assert_eq!(
state.finalized_epoch,
state.current_epoch() - 2,
"the head should be finalized two behind the current epoch"
);
}
#[test]
fn finalizes_with_two_thirds_participation() {
let num_blocks_produced = MinimalEthSpec::slots_per_epoch() * 5;
let harness = get_harness(VALIDATOR_COUNT);
let two_thirds = (VALIDATOR_COUNT / 3) * 2;
let attesters = (0..two_thirds).collect();
harness.extend_chain(
num_blocks_produced as usize,
BlockStrategy::OnCanonicalHead,
AttestationStrategy::SomeValidators(attesters),
);
let state = &harness.chain.head().beacon_state;
assert_eq!(
state.slot, num_blocks_produced,
"head should be at the current slot"
);
assert_eq!(
state.current_epoch(),
num_blocks_produced / MinimalEthSpec::slots_per_epoch(),
"head should be at the expected epoch"
);
// Note: the 2/3rds tests are not justifying the immediately prior epochs because the
// `MIN_ATTESTATION_INCLUSION_DELAY` is preventing an adequate number of attestations being
// included in blocks during that epoch.
assert_eq!(
state.current_justified_epoch,
state.current_epoch() - 2,
"the head should be justified two behind the current epoch"
);
assert_eq!(
state.finalized_epoch,
state.current_epoch() - 4,
"the head should be finalized three behind the current epoch"
);
}
#[test]
fn does_not_finalize_with_less_than_two_thirds_participation() {
let num_blocks_produced = MinimalEthSpec::slots_per_epoch() * 5;
let harness = get_harness(VALIDATOR_COUNT);
let two_thirds = (VALIDATOR_COUNT / 3) * 2;
let less_than_two_thirds = two_thirds - 1;
let attesters = (0..less_than_two_thirds).collect();
harness.extend_chain(
num_blocks_produced as usize,
BlockStrategy::OnCanonicalHead,
AttestationStrategy::SomeValidators(attesters),
);
let state = &harness.chain.head().beacon_state;
assert_eq!(
state.slot, num_blocks_produced,
"head should be at the current slot"
);
assert_eq!(
state.current_epoch(),
num_blocks_produced / MinimalEthSpec::slots_per_epoch(),
"head should be at the expected epoch"
);
assert_eq!(
state.current_justified_epoch, 0,
"no epoch should have been justified"
);
assert_eq!(
state.finalized_epoch, 0,
"no epoch should have been finalized"
);
}
#[test]
fn does_not_finalize_without_attestation() {
let num_blocks_produced = MinimalEthSpec::slots_per_epoch() * 5;
let harness = get_harness(VALIDATOR_COUNT);
harness.extend_chain(
num_blocks_produced as usize,
BlockStrategy::OnCanonicalHead,
AttestationStrategy::SomeValidators(vec![]),
);
let state = &harness.chain.head().beacon_state;
assert_eq!(
state.slot, num_blocks_produced,
"head should be at the current slot"
);
assert_eq!(
state.current_epoch(),
num_blocks_produced / MinimalEthSpec::slots_per_epoch(),
"head should be at the expected epoch"
);
assert_eq!(
state.current_justified_epoch, 0,
"no epoch should have been justified"
);
assert_eq!(
state.finalized_epoch, 0,
"no epoch should have been finalized"
);
}
}