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Merge pull request #738 from ethereum/JustinDrake-patch-4 

Semantic fork versions and signature domains
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Danny Ryan 2019-03-12 11:45:40 -06:00 committed by GitHub
parent 54fae53ce6 a68b050053
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1 changed files with 6 additions and 7 deletions
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specs/core/0_beacon-chain.md
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@ -290,9 +290,9 @@ The types are defined topologically to aid in facilitating an executable version
```python ```python
{ {
# Previous fork version # Previous fork version
'previous_version': 'uint64', 'previous_version': 'bytes4',
# Current fork version # Current fork version
'current_version': 'uint64', 'current_version': 'bytes4',
# Fork epoch number # Fork epoch number
'epoch': 'uint64', 'epoch': 'uint64',
} }
@ -1106,7 +1106,7 @@ def get_total_balance(state: BeaconState, validators: List[ValidatorIndex]) -> G
```python ```python
def get_fork_version(fork: Fork, def get_fork_version(fork: Fork,
epoch: Epoch) -> int: epoch: Epoch) -> bytes:
""" """
Return the fork version of the given ``epoch``. Return the fork version of the given ``epoch``.
""" """
@ -1125,8 +1125,7 @@ def get_domain(fork: Fork,
""" """
Get the domain number that represents the fork meta and signature domain. Get the domain number that represents the fork meta and signature domain.
""" """
fork_version = get_fork_version(fork, epoch) return bytes_to_int(get_fork_version(fork, epoch) + int_to_bytes4(domain_type))
return fork_version * 2**32 + domain_type
``` ```
### `get_bitfield_bit` ### `get_bitfield_bit`
@ -1518,8 +1517,8 @@ def get_genesis_beacon_state(genesis_validator_deposits: List[Deposit],
slot=GENESIS_SLOT, slot=GENESIS_SLOT,
genesis_time=genesis_time, genesis_time=genesis_time,
fork=Fork( fork=Fork(
previous_version=GENESIS_FORK_VERSION, previous_version=int_to_bytes4(GENESIS_FORK_VERSION),
current_version=GENESIS_FORK_VERSION, current_version=int_to_bytes4(GENESIS_FORK_VERSION),
epoch=GENESIS_EPOCH, epoch=GENESIS_EPOCH,
), ),