2019-06-13 23:57:29 +00:00
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from eth2spec.test.helpers.block import sign_block
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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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2019-05-30 20:57:18 +00:00
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def next_slot(spec, state):
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2019-05-15 16:36:32 +00:00
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"""
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Transition to the next slot.
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"""
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2019-05-30 20:57:18 +00:00
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spec.process_slots(state, state.slot + 1)
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2019-05-15 16:36:32 +00:00
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2019-05-30 20:57:18 +00:00
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def next_epoch(spec, state):
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2019-05-15 16:36:32 +00:00
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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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2019-05-30 20:57:18 +00:00
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spec.process_slots(state, slot)
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2019-05-15 16:36:32 +00:00
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2019-05-30 20:57:18 +00:00
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def get_state_root(spec, state, slot) -> bytes:
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2019-05-15 16:36:32 +00:00
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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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2019-06-09 19:41:21 +00:00
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return state.state_roots[slot % spec.SLOTS_PER_HISTORICAL_ROOT]
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2019-06-13 23:57:29 +00:00
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def state_transition_and_sign_block(spec, state, block):
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"""
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State transition via the provided ``block``
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then package the block with the state root and signature.
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"""
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spec.state_transition(state, block)
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block.state_root = state.hash_tree_root()
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sign_block(spec, state, block)
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