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Further decouple justification and finalisation (#958)

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Addresses @djrtwo's comment [here](https://github.com/ethereum/eth2.0-specs/pull/925#issuecomment-484123950).
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Justin 2019-04-18 13:31:19 +10:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -1683,7 +1683,8 @@ def update_justification_and_finalization(state: BeaconState) -> None:
if get_current_epoch(state) <= GENESIS_EPOCH + 1:
return
antepenultimate_justified_epoch = state.previous_justified_epoch
old_previous_justified_epoch = state.previous_justified_epoch
old_current_justified_epoch = state.current_justified_epoch
# Process justifications
state.previous_justified_epoch = state.current_justified_epoch
@ -1704,20 +1705,20 @@ def update_justification_and_finalization(state: BeaconState) -> None:
bitfield = state.justification_bitfield
current_epoch = get_current_epoch(state)
# The 2nd/3rd/4th most recent epochs are justified, the 2nd using the 4th as source
if (bitfield >> 1) % 8 == 0b111 and antepenultimate_justified_epoch == current_epoch - 3:
state.finalized_epoch = antepenultimate_justified_epoch
if (bitfield >> 1) % 8 == 0b111 and old_previous_justified_epoch == current_epoch - 3:
state.finalized_epoch = old_previous_justified_epoch
state.finalized_root = get_block_root(state, get_epoch_start_slot(state.finalized_epoch))
# The 2nd/3rd most recent epochs are justified, the 2nd using the 3rd as source
if (bitfield >> 1) % 4 == 0b11 and antepenultimate_justified_epoch == current_epoch - 2:
state.finalized_epoch = antepenultimate_justified_epoch
if (bitfield >> 1) % 4 == 0b11 and old_previous_justified_epoch == current_epoch - 2:
state.finalized_epoch = old_previous_justified_epoch
state.finalized_root = get_block_root(state, get_epoch_start_slot(state.finalized_epoch))
# The 1st/2nd/3rd most recent epochs are justified, the 1st using the 3rd as source
if (bitfield >> 0) % 8 == 0b111 and state.previous_justified_epoch == current_epoch - 2:
state.finalized_epoch = state.previous_justified_epoch
if (bitfield >> 0) % 8 == 0b111 and old_current_justified_epoch == current_epoch - 2:
state.finalized_epoch = old_current_justified_epoch
state.finalized_root = get_block_root(state, get_epoch_start_slot(state.finalized_epoch))
# The 1st/2nd most recent epochs are justified, the 1st using the 2nd as source
if (bitfield >> 0) % 4 == 0b11 and state.previous_justified_epoch == current_epoch - 1:
state.finalized_epoch = state.previous_justified_epoch
if (bitfield >> 0) % 4 == 0b11 and old_current_justified_epoch == current_epoch - 1:
state.finalized_epoch = old_current_justified_epoch
state.finalized_root = get_block_root(state, get_epoch_start_slot(state.finalized_epoch))
```