2022-12-10 12:53:24 +00:00
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# Nimbus
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# Copyright (c) 2022 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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2022-12-08 05:17:14 +00:00
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import
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eth/common
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from stew/objects
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import checkedEnumAssign
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# these procs are duplicates of nim-eth/eth_types_rlp.nim
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# both `readTxLegacy` and `readTxTyped` are exported here
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template read[T](rlp: var Rlp, val: var T)=
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val = rlp.read(type val)
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proc read[T](rlp: var Rlp, val: var Option[T])=
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if rlp.blobLen != 0:
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val = some(rlp.read(T))
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else:
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rlp.skipElem
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proc readTxLegacy*(rlp: var Rlp, tx: var Transaction)=
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tx.txType = TxLegacy
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rlp.tryEnterList()
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rlp.read(tx.nonce)
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rlp.read(tx.gasPrice)
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rlp.read(tx.gasLimit)
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rlp.read(tx.to)
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rlp.read(tx.value)
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rlp.read(tx.payload)
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rlp.read(tx.V)
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rlp.read(tx.R)
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rlp.read(tx.S)
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proc readTxEip2930(rlp: var Rlp, tx: var Transaction)=
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tx.txType = TxEip2930
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rlp.tryEnterList()
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tx.chainId = rlp.read(uint64).ChainId
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rlp.read(tx.nonce)
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rlp.read(tx.gasPrice)
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rlp.read(tx.gasLimit)
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rlp.read(tx.to)
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rlp.read(tx.value)
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rlp.read(tx.payload)
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rlp.read(tx.accessList)
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rlp.read(tx.V)
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rlp.read(tx.R)
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rlp.read(tx.S)
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proc readTxEip1559(rlp: var Rlp, tx: var Transaction)=
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tx.txType = TxEip1559
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rlp.tryEnterList()
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tx.chainId = rlp.read(uint64).ChainId
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rlp.read(tx.nonce)
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rlp.read(tx.maxPriorityFee)
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rlp.read(tx.maxFee)
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rlp.read(tx.gasLimit)
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rlp.read(tx.to)
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rlp.read(tx.value)
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rlp.read(tx.payload)
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rlp.read(tx.accessList)
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rlp.read(tx.V)
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rlp.read(tx.R)
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rlp.read(tx.S)
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proc readTxTyped*(rlp: var Rlp, tx: var Transaction) {.inline.} =
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# EIP-2718: We MUST decode the first byte as a byte, not `rlp.read(int)`.
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# If decoded with `rlp.read(int)`, bad transaction data (from the network)
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# or even just incorrectly framed data for other reasons fails with
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# any of these misleading error messages:
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# - "Message too large to fit in memory"
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# - "Number encoded with a leading zero"
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# - "Read past the end of the RLP stream"
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# - "Small number encoded in a non-canonical way"
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# - "Attempt to read an Int value past the RLP end"
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# - "The RLP contains a larger than expected Int value"
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if not rlp.isSingleByte:
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if not rlp.hasData:
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raise newException(MalformedRlpError,
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"Transaction expected but source RLP is empty")
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raise newException(MalformedRlpError,
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"TypedTransaction type byte is out of range, must be 0x00 to 0x7f")
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let txType = rlp.getByteValue
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rlp.position += 1
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var txVal: TxType
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if checkedEnumAssign(txVal, txType):
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case txVal:
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of TxEip2930:
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rlp.readTxEip2930(tx)
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return
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of TxEip1559:
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rlp.readTxEip1559(tx)
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return
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else:
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discard
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raise newException(UnsupportedRlpError,
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"TypedTransaction type must be 1 or 2 in this version, got " & $txType)
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