Merge is_genesis_trigger into get_genesis_state
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Justin Drake
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@ -94,7 +94,6 @@
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- [`initiate_validator_exit`](#initiate_validator_exit)
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- [`slash_validator`](#slash_validator)
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- [Genesis](#genesis)
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- [Genesis trigger](#genesis-trigger)
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- [Genesis state](#genesis-state)
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- [Genesis block](#genesis-block)
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- [Beacon chain state transition function](#beacon-chain-state-transition-function)
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@ -190,7 +189,7 @@ The following values are (non-configurable) constants used throughout the specif
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| `MIN_PER_EPOCH_CHURN_LIMIT` | `2**2` (= 4) |
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| `CHURN_LIMIT_QUOTIENT` | `2**16` (= 65,536) |
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| `SHUFFLE_ROUND_COUNT` | `90` |
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| `GENESIS_ACTIVE_VALIDATOR_COUNT` | `2**16` (= 65,536) |
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| `MIN_GENESIS_ACTIVE_VALIDATOR_COUNT` | `2**16` (= 65,536) |
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| `MIN_GENESIS_TIME` | `1578009600` (Jan 3, 2020) |
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| `JUSTIFICATION_BITS_LENGTH` | `4` |
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@ -1091,35 +1090,28 @@ def slash_validator(state: BeaconState,
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## Genesis
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### Genesis trigger
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### Genesis state
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Before genesis has been triggered and for every Ethereum 1.0 block call `is_genesis_trigger(deposits: Sequence[Deposit], timestamp: uint64) -> bool` where:
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Before the Ethereum 2.0 genesis has been triggered and for every Ethereum 1.0 block, call `get_genesis_beacon_state(eth1_block_hash, eth1_timestamp, deposits)` where:
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* `deposits` is the sequence of all deposits, ordered chronologically, up to and including the deposit triggering the latest `Deposit` log
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* `timestamp` is the Unix timestamp in the Ethereum 1.0 block that emitted the latest `Deposit` log
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* `eth1_block_hash` is the hash of the Ethereum 1.0 block
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* `eth1_timestamp` is the Unix timestamp corresponding to `eth1_block_hash`
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* `deposits` is the sequence of all deposits, ordered chronologically, up to the block with hash `eth1_block_hash`
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When `is_genesis_trigger(deposits, timestamp) is True` for the first time, let:
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The genesis state `genesis_state` is defined as the return value of the first call to `get_genesis_beacon_state` that does not trigger an `assert`.
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* `genesis_deposits = deposits`
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* `genesis_time = timestamp - timestamp % SECONDS_PER_DAY + 2 * SECONDS_PER_DAY`
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* `genesis_eth1_block_hash` is the Ethereum 1.0 block hash that emitted the log for the last deposit in `deposits`
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*Note*: The function `is_genesis_trigger` has yet to be agreed upon by the community, and can be updated as necessary. We define the following testing placeholder:
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*Note*: The two constants `MIN_GENESIS_TIME` and `MIN_GENESIS_ACTIVE_VALIDATOR_COUNT` in `get_genesis_beacon_state` have yet to be agreed upon by the community, and can be updated as necessary.
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```python
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def is_genesis_trigger(deposits: Sequence[Deposit], timestamp: uint64) -> bool:
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# Do not deploy too early
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if timestamp - timestamp % SECONDS_PER_DAY + 2 * SECONDS_PER_DAY < MIN_GENESIS_TIME:
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return False
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# Process genesis deposits
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state = BeaconState()
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process_genesis_deposits(state, deposits)
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# Check active validator count
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return len(get_active_validator_indices(state, GENESIS_EPOCH)) >= GENESIS_ACTIVE_VALIDATOR_COUNT
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```
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def get_genesis_beacon_state(eth1_block_hash: Hash, eth1_timestamp: int, deposits: Sequence[Deposit]) -> BeaconState:
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state = BeaconState(
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genesis_time=timestamp - timestamp % SECONDS_PER_DAY + 2 * SECONDS_PER_DAY,
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eth1_data=Eth1Data(block_hash=genesis_eth1_block_hash),
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latest_block_header=BeaconBlockHeader(body_root=hash_tree_root(BeaconBlockBody())),
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)
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assert state.genesis_time >= MIN_GENESIS_TIME
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```python
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def process_genesis_deposits(state: BeaconState, deposits: Sequence[Deposit]) -> None:
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# Process deposits
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leaves = list(map(lambda deposit: deposit.data, deposits))
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for deposit_index, deposit in enumerate(deposits):
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state.eth1_data.deposit_root = hash_tree_root(
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@ -1133,23 +1125,7 @@ def process_genesis_deposits(state: BeaconState, deposits: Sequence[Deposit]) ->
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if validator.effective_balance == MAX_EFFECTIVE_BALANCE:
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validator.activation_eligibility_epoch = GENESIS_EPOCH
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validator.activation_epoch = GENESIS_EPOCH
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```
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### Genesis state
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Let `genesis_state = get_genesis_beacon_state(genesis_deposits, genesis_time, genesis_eth1_block_hash)`.
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```python
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def get_genesis_beacon_state(deposits: Sequence[Deposit],
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genesis_time: int,
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genesis_eth1_block_hash: Hash) -> BeaconState:
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# Process genesis deposits
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state = BeaconState(
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genesis_time=genesis_time,
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eth1_data=Eth1Data(block_hash=genesis_eth1_block_hash),
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latest_block_header=BeaconBlockHeader(body_root=hash_tree_root(BeaconBlockBody())),
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)
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process_genesis_deposits(state, deposits)
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assert len(get_active_validator_indices(state, GENESIS_EPOCH)) >= MIN_GENESIS_ACTIVE_VALIDATOR_COUNT
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# Populate active_index_roots
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genesis_active_index_root = hash_tree_root(
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