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Merge pull request #1049 from ethereum/JustinDrake-patch-20 

Cosmetic genesis cleanups
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Danny Ryan 2019-05-06 10:06:15 -06:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -93,7 +93,10 @@
- [Routines for updating validator status](#routines-for-updating-validator-status) - [Routines for updating validator status](#routines-for-updating-validator-status)
- [`initiate_validator_exit`](#initiate_validator_exit) - [`initiate_validator_exit`](#initiate_validator_exit)
- [`slash_validator`](#slash_validator) - [`slash_validator`](#slash_validator)
- [On genesis](#on-genesis) - [Genesis](#genesis)
- [`Eth2Genesis`](#eth2genesis)
- [Genesis state](#genesis-state)
- [Genesis block](#genesis-block)
- [Beacon chain state transition function](#beacon-chain-state-transition-function) - [Beacon chain state transition function](#beacon-chain-state-transition-function)
- [State caching](#state-caching) - [State caching](#state-caching)
- [Per-epoch processing](#per-epoch-processing) - [Per-epoch processing](#per-epoch-processing)
@ -1171,30 +1174,29 @@ def slash_validator(state: BeaconState, slashed_index: ValidatorIndex, whistlebl
decrease_balance(state, slashed_index, whistleblowing_reward) decrease_balance(state, slashed_index, whistleblowing_reward)
``` ```
## On genesis ## Genesis
When enough full deposits have been made to the deposit contract, an `Eth2Genesis` log is emitted. Construct a corresponding `genesis_state` and `genesis_block` as follows: ### `Eth2Genesis`
* Let `genesis_validator_deposits` be the list of deposits, ordered chronologically, up to and including the deposit that triggered the `Eth2Genesis` log. When enough deposits of size `MAX_EFFECTIVE_BALANCE` have been made to the deposit contract an `Eth2Genesis` log is emitted triggering the genesis of the beacon chain. Let:
* Let `genesis_time` be the timestamp specified in the `Eth2Genesis` log.
* Let `genesis_eth1_data` be the `Eth1Data` object where: * `eth2genesis` be the object corresponding to `Eth2Genesis`
* `genesis_eth1_data.deposit_root` is the `deposit_root` contained in the `Eth2Genesis` log. * `genesis_eth1_data` be object of type `Eth1Data` where
* `genesis_eth1_data.deposit_count` is the `deposit_count` contained in the `Eth2Genesis` log. * `genesis_eth1_data.deposit_root = eth2genesis.deposit_root`
* `genesis_eth1_data.block_hash` is the hash of the Ethereum 1.0 block that emitted the `Eth2Genesis` log. * `genesis_eth1_data.deposit_count = eth2genesis.deposit_count`
* Let `genesis_state = get_genesis_beacon_state(genesis_validator_deposits, genesis_time, genesis_eth1_data)`. * `genesis_eth1_data.block_hash` is the hash of the Ethereum 1.0 block that emitted the `Eth2Genesis` log
* Let `genesis_block = BeaconBlock(state_root=hash_tree_root(genesis_state))`. * `genesis_deposits` be the object of type `List[Deposit]` with deposits ordered chronologically up to and including the deposit that triggered the `Eth2Genesis` log
### Genesis state
Let `genesis_state = get_genesis_beacon_state(genesis_deposits, eth2genesis.genesis_time, genesis_eth1_data)`.
```python ```python
def get_genesis_beacon_state(genesis_validator_deposits: List[Deposit], def get_genesis_beacon_state(deposits: List[Deposit], genesis_time: int, genesis_eth1_data: Eth1Data) -> BeaconState:
genesis_time: int,
genesis_eth1_data: Eth1Data) -> BeaconState:
"""
Get the genesis ``BeaconState``.
"""
state = BeaconState(genesis_time=genesis_time, latest_eth1_data=genesis_eth1_data) state = BeaconState(genesis_time=genesis_time, latest_eth1_data=genesis_eth1_data)
# Process genesis deposits # Process genesis deposits
for deposit in genesis_validator_deposits: for deposit in deposits:
process_deposit(state, deposit) process_deposit(state, deposit)
# Process genesis activations # Process genesis activations
@ -1203,6 +1205,7 @@ def get_genesis_beacon_state(genesis_validator_deposits: List[Deposit],
validator.activation_eligibility_epoch = GENESIS_EPOCH validator.activation_eligibility_epoch = GENESIS_EPOCH
validator.activation_epoch = GENESIS_EPOCH validator.activation_epoch = GENESIS_EPOCH
# Populate latest_active_index_roots
genesis_active_index_root = hash_tree_root(get_active_validator_indices(state, GENESIS_EPOCH)) genesis_active_index_root = hash_tree_root(get_active_validator_indices(state, GENESIS_EPOCH))
for index in range(LATEST_ACTIVE_INDEX_ROOTS_LENGTH): for index in range(LATEST_ACTIVE_INDEX_ROOTS_LENGTH):
state.latest_active_index_roots[index] = genesis_active_index_root state.latest_active_index_roots[index] = genesis_active_index_root
@ -1210,6 +1213,10 @@ def get_genesis_beacon_state(genesis_validator_deposits: List[Deposit],
return state return state
``` ```
### Genesis block
Let `genesis_block = BeaconBlock(state_root=hash_tree_root(genesis_state))`.
## Beacon chain state transition function ## Beacon chain state transition function
We now define the state transition function. At a high level, the state transition is made up of four parts: We now define the state transition function. At a high level, the state transition is made up of four parts: