define execution engine protocol
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protolambda
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@ -22,6 +22,9 @@
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- [New containers](#new-containers)
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- [`ExecutionPayload`](#executionpayload)
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- [`ExecutionPayloadHeader`](#executionpayloadheader)
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- [Protocols](#protocols)
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- [`ExecutionEngine`](#executionengine)
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- [`new_block`](#new_block)
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- [Helper functions](#helper-functions)
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- [Misc](#misc)
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- [`is_execution_enabled`](#is_execution_enabled)
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@ -30,7 +33,6 @@
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- [`compute_time_at_slot`](#compute_time_at_slot)
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- [Block processing](#block-processing)
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- [Execution payload processing](#execution-payload-processing)
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- [`verify_execution_state_transition`](#verify_execution_state_transition)
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- [`process_execution_payload`](#process_execution_payload)
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<!-- END doctoc generated TOC please keep comment here to allow auto update -->
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@ -137,6 +139,30 @@ class ExecutionPayloadHeader(Container):
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transactions_root: Root
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```
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## Protocols
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### `ExecutionEngine`
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The `ExecutionEngine` protocol separates the consensus and execution sub-systems.
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The consensus implementation references an instance of this sub-system with `EXECUTION_ENGINE`.
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The following methods are added to the `ExecutionEngine` protocol for use in the state transition:
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#### `new_block`
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Verifies the given `ExecutionPayload` with respect to execution state transition, and persists changes if valid.
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The body of this function is implementation dependent.
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The Consensus API may be used to implement this with an external execution engine.
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```python
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def new_block(self: ExecutionEngine, execution_payload: ExecutionPayload) -> bool:
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"""
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Returns True if the ``execution_payload`` was verified and processed successfully, False otherwise.
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"""
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...
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```
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## Helper functions
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### Misc
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@ -182,20 +208,15 @@ def process_block(state: BeaconState, block: BeaconBlock) -> None:
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process_operations(state, block.body)
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# Pre-merge, skip execution payload processing
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if is_execution_enabled(state, block):
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process_execution_payload(state, block.body.execution_payload) # [New in Merge]
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process_execution_payload(state, block.body.execution_payload, EXECUTION_ENGINE) # [New in Merge]
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```
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#### Execution payload processing
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##### `verify_execution_state_transition`
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Let `verify_execution_state_transition(execution_payload: ExecutionPayload) -> bool` be the function that verifies given `ExecutionPayload` with respect to execution state transition.
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The body of the function is implementation dependent.
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##### `process_execution_payload`
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```python
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def process_execution_payload(state: BeaconState, execution_payload: ExecutionPayload) -> None:
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def process_execution_payload(state: BeaconState, execution_payload: ExecutionPayload, execution_engine: ExecutionEngine) -> None:
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"""
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Note: This function is designed to be able to be run in parallel with the other `process_block` sub-functions
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"""
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@ -205,7 +226,7 @@ def process_execution_payload(state: BeaconState, execution_payload: ExecutionPa
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assert execution_payload.timestamp == compute_time_at_slot(state, state.slot)
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assert verify_execution_state_transition(execution_payload)
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assert execution_engine.new_block(execution_payload)
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state.latest_execution_payload_header = ExecutionPayloadHeader(
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block_hash=execution_payload.block_hash,
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@ -8,8 +8,13 @@
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<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
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- [Introduction](#introduction)
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- [Helpers](#helpers)
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- [Protocols](#protocols)
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- [`ExecutionEngine`](#executionengine)
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- [`set_head`](#set_head)
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- [`finalize_block`](#finalize_block)
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- [Containers](#containers)
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- [`PowBlock`](#powblock)
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- [Helper functions](#helper-functions)
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- [`get_pow_block`](#get_pow_block)
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- [`is_valid_transition_block`](#is_valid_transition_block)
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- [Updated fork-choice handlers](#updated-fork-choice-handlers)
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@ -24,7 +29,44 @@ This is the modification of the fork choice according to the executable beacon c
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*Note*: It introduces the process of transition from the last PoW block to the first PoS block.
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### Helpers
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## Protocols
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### `ExecutionEngine`
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The following methods are added to the `ExecutionEngine` protocol for use in the fork choice:
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#### `set_head`
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Re-organizes the execution payload chain and corresponding state to make `block_hash` the head.
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The body of this function is implementation dependent.
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The Consensus API may be used to implement this with an external execution engine.
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```python
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def set_head(self: ExecutionEngine, block_hash: Hash32) -> bool:
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"""
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Returns True if the ``block_hash`` was successfully set as head of the execution payload chain.
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"""
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...
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```
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#### `finalize_block`
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Applies finality to the execution state: it irreversibly persists the chain of all execution payloads
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and corresponding state, up to and including `block_hash`.
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The body of this function is implementation dependent.
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The Consensus API may be used to implement this with an external execution engine.
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```python
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def finalize_block(self: ExecutionEngine, block_hash: Hash32) -> bool:
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"""
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Returns True if the data up to and including ``block_hash`` was successfully finalized.
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"""
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...
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```
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## Containers
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#### `PowBlock`
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@ -36,6 +78,8 @@ class PowBlock(Container):
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total_difficulty: uint256
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```
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## Helper functions
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#### `get_pow_block`
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Let `get_pow_block(block_hash: Hash32) -> PowBlock` be the function that given the hash of the PoW block returns its data.
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@ -52,7 +96,7 @@ def is_valid_transition_block(block: PowBlock) -> bool:
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return block.is_valid and is_total_difficulty_reached
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```
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### Updated fork-choice handlers
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## Updated fork-choice handlers
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#### `on_block`
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@ -12,6 +12,9 @@
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- [Introduction](#introduction)
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- [Prerequisites](#prerequisites)
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- [Protocols](#protocols)
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- [`ExecutionEngine`](#executionengine)
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- [`assemble_block`](#assemble_block)
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- [Beacon chain responsibilities](#beacon-chain-responsibilities)
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- [Block proposal](#block-proposal)
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- [Constructing the `BeaconBlockBody`](#constructing-the-beaconblockbody)
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@ -32,6 +35,25 @@ This document is an extension of the [Phase 0 -- Validator](../phase0/validator.
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All terminology, constants, functions, and protocol mechanics defined in the updated Beacon Chain doc of [The Merge](./beacon-chain.md) are requisite for this document and used throughout. Please see related Beacon Chain doc before continuing and use them as a reference throughout.
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## Protocols
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### `ExecutionEngine`
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The following methods are added to the `ExecutionEngine` protocol for use as a validator:
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#### `assemble_block`
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Produces a new instance of an execution payload, with the specified timestamp,
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on top of the execution payload chain tip identified by `block_head`.
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The body of this function is implementation dependent.
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The Consensus API may be used to implement this with an external execution engine.
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```python
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def assemble_block(self: ExecutionEngine, block_hash: Hash32, timestamp: uint64) -> ExecutionPayload:
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...
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```
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## Beacon chain responsibilities
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All validator responsibilities remain unchanged other than those noted below. Namely, the transition block handling and the addition of `ExecutionPayload`.
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@ -49,12 +71,12 @@ Let `get_pow_chain_head() -> PowBlock` be the function that returns the head of
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###### `produce_execution_payload`
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Let `produce_execution_payload(parent_hash: Hash32, timestamp: uint64) -> ExecutionPayload` be the function that produces new instance of execution payload.
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The body of this function is implementation dependent.
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The `ExecutionEngine` protocol is used for the implementation specific part of execution payload proposals.
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* Set `block.body.execution_payload = get_execution_payload(state)` where:
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```python
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def get_execution_payload(state: BeaconState) -> ExecutionPayload:
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def get_execution_payload(state: BeaconState, execution_engine: ExecutionEngine) -> ExecutionPayload:
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if not is_transition_completed(state):
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pow_block = get_pow_chain_head()
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if not is_valid_transition_block(pow_block):
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@ -63,7 +85,7 @@ def get_execution_payload(state: BeaconState) -> ExecutionPayload:
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else:
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# Signify merge via producing on top of the last PoW block
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timestamp = compute_time_at_slot(state, state.slot)
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return produce_execution_payload(pow_block.block_hash, timestamp)
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return execution_engine.assemble_block(pow_block.block_hash, timestamp)
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# Post-merge, normal payload
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execution_parent_hash = state.latest_execution_payload_header.block_hash
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