2019-05-15 16:36:32 +00:00
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# Access constants from spec pkg reference.
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import eth2spec.phase0.spec as spec
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2019-05-17 18:31:21 +00:00
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from eth2spec.phase0.state_transition import state_transition_to
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2019-05-15 16:36:32 +00:00
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def get_balance(state, index):
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return state.balances[index]
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def next_slot(state):
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"""
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Transition to the next slot.
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"""
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state_transition_to(state, state.slot + 1)
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def next_epoch(state):
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"""
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Transition to the start slot of the next epoch
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"""
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slot = state.slot + spec.SLOTS_PER_EPOCH - (state.slot % spec.SLOTS_PER_EPOCH)
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state_transition_to(state, slot)
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def get_state_root(state, slot) -> bytes:
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"""
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Return the state root at a recent ``slot``.
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"""
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assert slot < state.slot <= slot + spec.SLOTS_PER_HISTORICAL_ROOT
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return state.latest_state_roots[slot % spec.SLOTS_PER_HISTORICAL_ROOT]
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