Fix issue around on_attestation validation by skipping epoch scope
validation if attestation is from a block message
This commit is contained in:
Hsiao-Wei Wang
parent
cd3d2ce692
commit
f643554aa5
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@ -22,6 +22,7 @@
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- [`get_head`](#get_head)
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- [`should_update_justified_checkpoint`](#should_update_justified_checkpoint)
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- [`on_attestation` helpers](#on_attestation-helpers)
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- [`validate_target_epoch_scope`](#validate_target_epoch_scope)
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- [`validate_on_attestation`](#validate_on_attestation)
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- [`store_target_checkpoint_state`](#store_target_checkpoint_state)
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- [`update_latest_messages`](#update_latest_messages)
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@ -257,10 +258,11 @@ def should_update_justified_checkpoint(store: Store, new_justified_checkpoint: C
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#### `on_attestation` helpers
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##### `validate_on_attestation`
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##### `validate_target_epoch_scope`
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```python
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def validate_on_attestation(store: Store, attestation: Attestation) -> None:
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def validate_target_epoch_scope(store: Store, attestation: Attestation) -> None:
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target = attestation.data.target
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# Attestations must be from the current or previous epoch
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@ -269,6 +271,15 @@ def validate_on_attestation(store: Store, attestation: Attestation) -> None:
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previous_epoch = current_epoch - 1 if current_epoch > GENESIS_EPOCH else GENESIS_EPOCH
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# If attestation target is from a future epoch, delay consideration until the epoch arrives
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assert target.epoch in [current_epoch, previous_epoch]
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```
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##### `validate_on_attestation`
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```python
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def validate_on_attestation(store: Store, attestation: Attestation) -> None:
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target = attestation.data.target
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# Check that the epoch number and slot number are matching
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assert target.epoch == compute_epoch_at_slot(attestation.data.slot)
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# Attestations target be for a known block. If target block is unknown, delay consideration until the block is found
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@ -378,7 +389,7 @@ def on_block(store: Store, signed_block: SignedBeaconBlock) -> None:
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#### `on_attestation`
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```python
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def on_attestation(store: Store, attestation: Attestation) -> None:
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def on_attestation(store: Store, attestation: Attestation, is_from_block: bool=False) -> None:
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"""
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Run ``on_attestation`` upon receiving a new ``attestation`` from either within a block or directly on the wire.
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@ -386,6 +397,10 @@ def on_attestation(store: Store, attestation: Attestation) -> None:
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consider scheduling it for later processing in such case.
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"""
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validate_on_attestation(store, attestation)
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if not is_from_block:
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# If the given attestation is not from a beacon block message, we have to check the target epoch scope.
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validate_target_epoch_scope(store, attestation)
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store_target_checkpoint_state(store, attestation.data.target)
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# Get state at the `target` to fully validate attestation
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@ -23,7 +23,7 @@ def add_block_to_store(spec, store, signed_block):
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spec.on_block(store, signed_block)
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def tick_and_add_block(spec, store, signed_block, test_steps, valid=True, allow_invalid_attestations=False,
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def tick_and_add_block(spec, store, signed_block, test_steps, valid=True,
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merge_block=False, block_not_found=False):
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pre_state = store.block_states[signed_block.message.parent_root]
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block_time = pre_state.genesis_time + signed_block.message.slot * spec.config.SECONDS_PER_SLOT
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@ -36,14 +36,13 @@ def tick_and_add_block(spec, store, signed_block, test_steps, valid=True, allow_
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post_state = yield from add_block(
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spec, store, signed_block, test_steps,
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valid=valid,
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allow_invalid_attestations=allow_invalid_attestations,
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block_not_found=block_not_found,
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)
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return post_state
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def tick_and_run_on_attestation(spec, store, attestation, test_steps):
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def tick_and_run_on_attestation(spec, store, attestation, test_steps, is_from_block=False):
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parent_block = store.blocks[attestation.data.beacon_block_root]
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pre_state = store.block_states[spec.hash_tree_root(parent_block)]
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block_time = pre_state.genesis_time + parent_block.slot * spec.config.SECONDS_PER_SLOT
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@ -53,40 +52,21 @@ def tick_and_run_on_attestation(spec, store, attestation, test_steps):
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spec.on_tick(store, next_epoch_time)
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test_steps.append({'tick': int(next_epoch_time)})
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spec.on_attestation(store, attestation)
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spec.on_attestation(store, attestation, is_from_block=is_from_block)
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yield get_attestation_file_name(attestation), attestation
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test_steps.append({'attestation': get_attestation_file_name(attestation)})
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def add_attestation(spec, store, attestation, test_steps, valid=True):
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yield get_attestation_file_name(attestation), attestation
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def run_on_attestation(spec, store, attestation, is_from_block=False, valid=True):
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if not valid:
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try:
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run_on_attestation(spec, store, attestation, valid=True)
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except AssertionError:
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test_steps.append({
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'attestation': get_attestation_file_name(attestation),
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'valid': False,
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})
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return
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else:
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assert False
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run_on_attestation(spec, store, attestation, valid=True)
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test_steps.append({'attestation': get_attestation_file_name(attestation)})
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def run_on_attestation(spec, store, attestation, valid=True):
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if not valid:
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try:
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spec.on_attestation(store, attestation)
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spec.on_attestation(store, attestation, is_from_block)
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except AssertionError:
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return
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else:
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assert False
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spec.on_attestation(store, attestation)
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spec.on_attestation(store, attestation, is_from_block)
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def get_genesis_forkchoice_store(spec, genesis_state):
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@ -131,7 +111,6 @@ def add_block(spec,
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signed_block,
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test_steps,
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valid=True,
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allow_invalid_attestations=False,
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block_not_found=False):
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"""
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Run on_block and on_attestation
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@ -156,14 +135,8 @@ def add_block(spec,
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test_steps.append({'block': get_block_file_name(signed_block)})
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# An on_block step implies receiving block's attestations
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try:
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for attestation in signed_block.message.body.attestations:
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run_on_attestation(spec, store, attestation, valid=True)
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except AssertionError:
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if allow_invalid_attestations:
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pass
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else:
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raise
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for attestation in signed_block.message.body.attestations:
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run_on_attestation(spec, store, attestation, is_from_block=True, valid=True)
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block_root = signed_block.message.hash_tree_root()
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print(encode_hex(block_root))
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@ -543,21 +543,19 @@ def test_new_justified_is_later_than_store_justified(spec, state):
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assert fork_3_state.finalized_checkpoint.epoch == 3
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assert fork_3_state.current_justified_checkpoint.epoch == 4
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# FIXME: pending on the `on_block`, `on_attestation` fix
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# # Apply blocks of `fork_3_state` to `store`
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# for block in all_blocks:
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# if store.time < spec.compute_time_at_slot(fork_2_state, block.message.slot):
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# time = store.genesis_time + block.message.slot * spec.config.SECONDS_PER_SLOT
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# on_tick_and_append_step(spec, store, time, test_steps)
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# # valid_attestations=False because the attestations are outdated (older than previous epoch)
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# yield from add_block(spec, store, block, test_steps, allow_invalid_attestations=False)
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# Apply blocks of `fork_3_state` to `store`
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for block in all_blocks:
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if store.time < spec.compute_time_at_slot(fork_2_state, block.message.slot):
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time = store.genesis_time + block.message.slot * spec.config.SECONDS_PER_SLOT
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on_tick_and_append_step(spec, store, time, test_steps)
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yield from add_block(spec, store, block, test_steps)
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# assert store.finalized_checkpoint == fork_3_state.finalized_checkpoint
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# assert (store.justified_checkpoint
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# == fork_3_state.current_justified_checkpoint
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# != store.best_justified_checkpoint)
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# assert (store.best_justified_checkpoint
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# == fork_2_state.current_justified_checkpoint)
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assert store.finalized_checkpoint == fork_3_state.finalized_checkpoint
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assert (store.justified_checkpoint
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== fork_3_state.current_justified_checkpoint
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!= store.best_justified_checkpoint)
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assert (store.best_justified_checkpoint
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== fork_2_state.current_justified_checkpoint)
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yield 'steps', test_steps
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@ -628,7 +626,7 @@ def test_new_finalized_slot_is_not_justified_checkpoint_ancestor(spec, state):
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# # Apply blocks of `another_state` to `store`
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# for block in all_blocks:
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# # NOTE: Do not call `on_tick` here
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# yield from add_block(spec, store, block, test_steps, allow_invalid_attestations=True)
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# yield from add_block(spec, store, block, test_steps)
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# finalized_slot = spec.compute_start_slot_at_epoch(store.finalized_checkpoint.epoch)
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# ancestor_at_finalized_slot = spec.get_ancestor(store, pre_store_justified_checkpoint_root, finalized_slot)
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@ -704,7 +702,7 @@ def test_new_finalized_slot_is_justified_checkpoint_ancestor(spec, state):
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for block in all_blocks:
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# FIXME: Once `on_block` and `on_attestation` logic is fixed,
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# fix test case and remove allow_invalid_attestations flag
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yield from tick_and_add_block(spec, store, block, test_steps, allow_invalid_attestations=True)
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yield from tick_and_add_block(spec, store, block, test_steps)
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finalized_slot = spec.compute_start_slot_at_epoch(store.finalized_checkpoint.epoch)
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ancestor_at_finalized_slot = spec.get_ancestor(store, pre_store_justified_checkpoint_root, finalized_slot)
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@ -712,8 +710,9 @@ def test_new_finalized_slot_is_justified_checkpoint_ancestor(spec, state):
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assert store.finalized_checkpoint == another_state.finalized_checkpoint
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# Thus should fail with the fix. Once show fail, swap to ==
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assert store.justified_checkpoint != another_state.current_justified_checkpoint
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# assert store.justified_checkpoint != another_state.current_justified_checkpoint
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print(store.finalized_checkpoint)
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print(store.justified_checkpoint)
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print('spec.get_head(store)', spec.get_head(store))
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yield 'steps', test_steps
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