77 lines
2.6 KiB
Nim
77 lines
2.6 KiB
Nim
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# Nimbus
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# Copyright (c) 2024 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
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# http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
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# http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except
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# according to those terms.
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{.push raises: [].}
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import
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eth/common,
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stew/arrayops,
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stew/endians2,
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results,
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../constants
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# -----------------------------------------------------------------------------
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# Private helpers
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# -----------------------------------------------------------------------------
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# UnpackIntoDeposit unpacks a serialized DepositEvent.
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func unpackIntoDeposit(data: openArray[byte]): Result[Request, string] =
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if data.len != 576:
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return err("deposit wrong length: want 576, have " & $data.len)
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# The ABI encodes the position of dynamic elements first. Since there
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# are 5 elements, skip over the positional data. The first 32 bytes of
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# dynamic elements also encode their actual length. Skip over that value too.
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const
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b = 32*5 + 32
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c = b + 48 + 16 + 32
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d = c + 32 + 32
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e = d + 8 + 24 + 32
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f = e + 96 + 32
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template copyFrom(T: type, input, a, b): auto =
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T.initCopyFrom(input.toOpenArray(a, b))
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let res = Request(
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requestType: DepositRequestType,
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deposit: DepositRequest(
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# PublicKey is the first element. ABI encoding pads values to 32 bytes,
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# so despite BLS public keys being length 48, the value length
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# here is 64. Then skip over the next length value.
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pubkey: array[48, byte].copyFrom(data, b, b+47),
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# WithdrawalCredentials is 32 bytes. Read that value then skip over next
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# length.
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withdrawalCredentials: array[32, byte].copyFrom(data, c, c+31),
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# Amount is 8 bytes, but it is padded to 32. Skip over it and the next
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# length.
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amount: uint64.fromBytesLE(data.toOpenArray(d, d+7)),
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# Signature is 96 bytes. Skip over it and the next length.
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signature: array[96, byte].copyFrom(data, e, e+95),
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# Amount is 8 bytes.
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index: uint64.fromBytesLE(data.toOpenArray(f, f+7)),
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)
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)
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ok(res)
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# -----------------------------------------------------------------------------
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# Public functions
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# -----------------------------------------------------------------------------
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func parseDepositLogs*(logs: openArray[Log]): Result[seq[Request], string] =
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var res: seq[Request]
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for log in logs:
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if log.address == DEPOSIT_CONTRACT_ADDRESS:
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res.add ?unpackIntoDeposit(log.data)
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ok(res)
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