54 lines
2.0 KiB
Nim
54 lines
2.0 KiB
Nim
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from stew/objects import isZeroMemory
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import ./eth2_merkleization
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from ./datatypes/base import Eth1Data, DepositContractState
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from ./digest import Eth2Digest
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export
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depositCountBytes, depositCountU64
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type
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OldDepositContractSnapshot* = object
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eth1Block*: Eth2Digest
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depositContractState*: DepositContractState
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DepositTreeSnapshot* = object
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## https://eips.ethereum.org/EIPS/eip-4881
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eth1Block*: Eth2Digest
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depositContractState*: DepositContractState
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blockHeight*: uint64
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func toDepositTreeSnapshot*(d: OldDepositContractSnapshot,
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blockHeight: uint64): DepositTreeSnapshot =
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DepositTreeSnapshot(
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eth1Block: d.eth1Block,
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depositContractState: d.depositContractState,
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blockHeight: blockHeight)
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func toOldDepositContractSnapshot*(d: DepositTreeSnapshot): OldDepositContractSnapshot =
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OldDepositContractSnapshot(eth1Block: d.eth1Block,
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depositContractState: d.depositContractState)
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template getDepositCountU64*(d: OldDepositContractSnapshot |
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DepositTreeSnapshot): uint64 =
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depositCountU64(d.depositContractState.deposit_count)
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func getDepositRoot*(d: OldDepositContractSnapshot |
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DepositTreeSnapshot): Eth2Digest =
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let merk = DepositsMerkleizer.init(d.depositContractState)
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let hash = merk.getFinalHash()
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# TODO: mixInLength should accept unsigned int instead of int as
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# this right now cuts in half the theoretical number of deposits.
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return mixInLength(hash, int(merk.totalChunks))
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func isValid*(d: DepositTreeSnapshot, wantedDepositRoot: Eth2Digest): bool =
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## `isValid` requires the snapshot to be self-consistent and
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## to point to a specific Ethereum block
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return not (d.eth1Block.isZeroMemory or
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d.blockHeight == 0 or
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d.getDepositRoot() != wantedDepositRoot)
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func matches*(snapshot: DepositTreeSnapshot, eth1_data: Eth1Data): bool =
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snapshot.getDepositCountU64() == eth1_data.deposit_count and
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snapshot.getDepositRoot() == eth1_data.deposit_root
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