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Update 0_beacon-chain.md

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Justin 2019-05-07 10:33:51 +01:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -75,7 +75,7 @@
- [`compute_committee`](#compute_committee)
- [`get_crosslink_committee`](#get_crosslink_committee)
- [`get_attesting_indices`](#get_attesting_indices)
- [`int_to_bytes1`, `int_to_bytes2`, ...](#int_to_bytes1-int_to_bytes2-)
- [`int_to_bytes`](#int_to_bytes)
- [`bytes_to_int`](#bytes_to_int)
- [`get_total_balance`](#get_total_balance)
- [`get_domain`](#get_domain)
@ -194,8 +194,8 @@ These configurations are updated for releases, but may be out of sync during `de
| `GENESIS_SLOT` | `0` |
| `GENESIS_EPOCH` | `0` |
| `FAR_FUTURE_EPOCH` | `2**64 - 1` |
| `ZERO_HASH` | `int_to_bytes32(0)` |
| `BLS_WITHDRAWAL_PREFIX_BYTE` | `int_to_bytes1(0)` |
| `ZERO_HASH` | `int_to_bytes(0, length=32)` |
| `BLS_WITHDRAWAL_PREFIX_BYTE` | `int_to_bytes(0, length=1)` |
### Time parameters
@ -830,7 +830,7 @@ def generate_seed(state: BeaconState,
return hash(
get_randao_mix(state, epoch + LATEST_RANDAO_MIXES_LENGTH - MIN_SEED_LOOKAHEAD) +
get_active_index_root(state, epoch) +
int_to_bytes32(epoch)
int_to_bytes(epoch, length=32)
)
```
@ -851,7 +851,7 @@ def get_beacon_proposer_index(state: BeaconState) -> ValidatorIndex:
i = 0
while True:
candidate_index = first_committee[(epoch + i) % len(first_committee)]
random_byte = hash(seed + int_to_bytes8(i // 32))[i % 32]
random_byte = hash(seed + int_to_bytes(i // 32, length=8))[i % 32]
effective_balance = state.validator_registry[candidate_index].effective_balance
if effective_balance * MAX_RANDOM_BYTE >= MAX_EFFECTIVE_BALANCE * random_byte:
return candidate_index
@ -888,10 +888,10 @@ def get_shuffled_index(index: ValidatorIndex, index_count: int, seed: Bytes32) -
# Swap or not (https://link.springer.com/content/pdf/10.1007%2F978-3-642-32009-5_1.pdf)
# See the 'generalized domain' algorithm on page 3
for round in range(SHUFFLE_ROUND_COUNT):
pivot = bytes_to_int(hash(seed + int_to_bytes1(round))[0:8]) % index_count
pivot = bytes_to_int(hash(seed + int_to_bytes(round, length=1))[0:8]) % index_count
flip = (pivot - index) % index_count
position = max(index, flip)
source = hash(seed + int_to_bytes1(round) + int_to_bytes4(position // 256))
source = hash(seed + int_to_bytes(round, length=1) + int_to_bytes(position // 256, length=4))
byte = source[(position % 256) // 8]
bit = (byte >> (position % 8)) % 2
index = flip if bit else index
@ -934,9 +934,12 @@ def get_attesting_indices(state: BeaconState,
return sorted([index for i, index in enumerate(committee) if get_bitfield_bit(bitfield, i) == 0b1])
```
### `int_to_bytes1`, `int_to_bytes2`, ...
### `int_to_bytes`
`int_to_bytes1(x): return x.to_bytes(1, 'little')`, `int_to_bytes2(x): return x.to_bytes(2, 'little')`, and so on for all integers, particularly 1, 2, 3, 4, 8, 32, 48, 96.
```python
def int_to_bytes(integer: int, length: int) -> bytes:
return integer.to_bytes(length, 'little')
```
### `bytes_to_int`
@ -966,7 +969,7 @@ def get_domain(state: BeaconState,
"""
epoch = get_current_epoch(state) if message_epoch is None else message_epoch
fork_version = state.fork.previous_version if epoch < state.fork.epoch else state.fork.current_version
return bytes_to_int(fork_version + int_to_bytes4(domain_type))
return bytes_to_int(fork_version + int_to_bytes(domain_type, length=4))
```
### `get_bitfield_bit`