118 lines
4.8 KiB
Nim
118 lines
4.8 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2022 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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import
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# Beacon chain internals
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../../beacon_chain/spec/
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[forks, helpers, signatures, state_transition, validator],
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../../beacon_chain/spec/datatypes/[phase0, altair, bellatrix],
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# Test utilities
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../testblockutil
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# Routines for mocking blocks
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# ---------------------------------------------------------------
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# https://github.com/ethereum/consensus-specs/blob/v1.1.8/tests/core/pyspec/eth2spec/test/helpers/block.py#L26-L35
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func apply_randao_reveal(state: ForkyBeaconState, blck: var ForkySignedBeaconBlock) =
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doAssert state.slot <= blck.message.slot
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let
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proposer_index = blck.message.proposer_index.ValidatorIndex
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privkey = MockPrivKeys[proposer_index]
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blck.message.body.randao_reveal = get_epoch_signature(
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state.fork,
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state.genesis_validators_root,
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blck.message.slot.epoch,
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privkey).toValidatorSig()
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# https://github.com/ethereum/consensus-specs/blob/v1.1.8/tests/core/pyspec/eth2spec/test/helpers/block.py#L38-L54
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func sign_block(state: ForkyBeaconState, blck: var ForkySignedBeaconBlock) =
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let
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proposer_index = blck.message.proposer_index.ValidatorIndex
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privkey = MockPrivKeys[proposer_index]
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blck.root = blck.message.hash_tree_root()
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blck.signature = get_block_signature(
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state.fork,
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state.genesis_validators_root,
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blck.message.slot,
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blck.root,
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privkey).toValidatorSig()
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# https://github.com/ethereum/consensus-specs/blob/v1.1.8/tests/core/pyspec/eth2spec/test/helpers/execution_payload.py#L1-L31
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func build_empty_execution_payload(state: bellatrix.BeaconState): ExecutionPayload =
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## Assuming a pre-state of the same slot, build a valid ExecutionPayload
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## without any transactions.
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let
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latest = state.latest_execution_payload_header
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timestamp = compute_timestamp_at_slot(state, state.slot)
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randao_mix = get_randao_mix(state, get_current_epoch(state))
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var payload = ExecutionPayload(
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parent_hash: latest.block_hash,
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state_root: latest.state_root, # no changes to the state
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receipts_root: Eth2Digest(data: cast[array[32, uint8]](
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"no receipts here\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0")),
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block_number: latest.block_number + 1,
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random: randao_mix,
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gas_limit: latest.gas_limit, # retain same limit
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gas_used: 0, # empty block, 0 gas
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timestamp: timestamp,
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base_fee_per_gas: latest.base_fee_per_gas) # retain same base_fee
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payload.block_hash = withEth2Hash:
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h.update payload.hash_tree_root().data
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h.update cast[array[13, uint8]]("FAKE RLP HASH")
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payload
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# https://github.com/ethereum/consensus-specs/blob/v1.1.8/tests/core/pyspec/eth2spec/test/helpers/block.py#L75-L104
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proc mockBlock*(
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state: ForkedHashedBeaconState,
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slot: Slot,
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cfg = defaultRuntimeConfig): ForkedSignedBeaconBlock =
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## TODO don't do this gradual construction, for exception safety
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## Mock a BeaconBlock for the specific slot
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var
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cache = StateCache()
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tmpState = assignClone(state)
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if getStateField(state, slot) != slot:
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var info = ForkedEpochInfo()
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process_slots(cfg, tmpState[], slot, cache, info, flags = {}).expect("no failure")
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result.kind = case tmpState[].kind
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of BeaconStateFork.Phase0: BeaconBlockFork.Phase0
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of BeaconStateFork.Altair: BeaconBlockFork.Altair
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of BeaconStateFork.Bellatrix: BeaconBlockFork.Bellatrix
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withStateAndBlck(tmpState[], result):
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blck.message.slot = slot
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blck.message.proposer_index =
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get_beacon_proposer_index(state.data, cache, slot).get.uint64
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blck.message.body.eth1_data.deposit_count = state.data.eth1_deposit_index
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blck.message.parent_root = block:
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var previous_block_header = state.data.latest_block_header
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if previous_block_header.state_root == ZERO_HASH:
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previous_block_header.state_root = state.data.hash_tree_root()
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previous_block_header.hash_tree_root()
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apply_randao_reveal(state.data, blck)
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when stateFork >= BeaconStateFork.Altair:
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blck.message.body.sync_aggregate = SyncAggregate.init()
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when stateFork >= BeaconStateFork.Bellatrix:
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blck.message.body.execution_payload =
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build_empty_execution_payload(state.data)
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sign_block(state.data, blck)
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# https://github.com/ethereum/consensus-specs/blob/v1.1.8/tests/core/pyspec/eth2spec/test/helpers/block.py#L107-L108
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proc mockBlockForNextSlot*(
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state: ForkedHashedBeaconState): ForkedSignedBeaconBlock =
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## Mock a BeaconBlock for the next slot
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mockBlock(state, getStateField(state, slot) + 1)
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