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Replace get_pow_chain_head with get_pow_block_at_total_difficulty in validator.md

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Mikhail Kalinin 2021-07-17 12:33:06 +06:00
parent a4a050e97a
commit add00ad2e0
2 changed files with 18 additions and 11 deletions
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1
setup.py
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@ -496,6 +496,7 @@ class MergeSpecBuilder(Phase0SpecBuilder):
from typing import Protocol
from eth2spec.phase0 import {preset_name} as phase0
from eth2spec.utils.ssz.ssz_typing import Bytes20, ByteList, ByteVector, uint256, Union
from typing import Union as PyUnion
'''
@classmethod

28
specs/merge/validator.md
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@ -19,7 +19,6 @@
- [Block proposal](#block-proposal)
- [Constructing the `BeaconBlockBody`](#constructing-the-beaconblockbody)
- [Execution Payload](#execution-payload)
- [`get_pow_chain_head`](#get_pow_chain_head)
<!-- END doctoc generated TOC please keep comment here to allow auto update -->
<!-- /TOC -->
@ -63,13 +62,20 @@ All validator responsibilities remain unchanged other than those noted below. Na
##### Execution Payload
###### `get_pow_chain_head`
Let `get_pow_chain_head() -> PowBlock` be the function that returns the head of the PoW chain. The body of the function is implementation specific.
* Set `block.body.execution_payload = get_execution_payload(state, transition_store, execution_engine)` where:
* Set `block.body.execution_payload = get_execution_payload(state, transition_store, execution_engine, pow_chain)` where:
```python
def get_pow_block_at_total_difficulty(total_difficulty: uint256,
pow_chain: Sequence[PowBlock]) -> PyUnion[PowBlock, None]:
# `pow_chain` abstractly represents all blocks in the PoW chain
for block in pow_chain:
parent = get_pow_block(block.parent_hash)
if block.total_difficulty >= total_difficulty and parent.total_difficulty < total_difficulty:
return block
return None
def compute_randao_mix(state: BeaconState, randao_reveal: BLSSignature) -> Bytes32:
epoch = get_current_epoch(state)
return xor(get_randao_mix(state, epoch), hash(randao_reveal))
@ -87,16 +93,16 @@ def produce_execution_payload(state: BeaconState,
def get_execution_payload(state: BeaconState,
transition_store: TransitionStore,
randao_reveal: BLSSignature,
execution_engine: ExecutionEngine) -> ExecutionPayload:
execution_engine: ExecutionEngine,
pow_chain: Sequence[PowBlock]) -> ExecutionPayload:
if not is_merge_complete(state):
pow_block = get_pow_chain_head()
pow_parent = get_pow_block(pow_block.parent_hash)
if not is_valid_terminal_pow_block(transition_store, pow_block, pow_parent):
terminal_pow_block = get_pow_block_at_total_difficulty(transition_store.transition_total_difficulty, pow_chain)
if terminal_pow_block is None:
# Pre-merge, empty payload
return ExecutionPayload()
else:
# Signify merge via producing on top of the last PoW block
return produce_execution_payload(state, pow_block.block_hash, randao_reveal, execution_engine)
return produce_execution_payload(state, terminal_pow_block.block_hash, randao_reveal, execution_engine)
# Post-merge, normal payload
parent_hash = state.latest_execution_payload_header.block_hash