nimbus-eth1/premix/parser.nim

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Nim
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import
json, strutils, times, options, os,
eth/[rlp, common], httputils, nimcrypto,
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stint, stew/byteutils
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import ../nimbus/transaction, ../nimbus/utils/ec_recover
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from ../nimbus/rpc/hexstrings import encodeQuantity
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func hexToInt*(s: string, T: typedesc[SomeInteger]): T =
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var i = 0
if s[i] == '0' and (s[i+1] in {'x', 'X'}): inc(i, 2)
if s.len - i > sizeof(T) * 2:
raise newException(ValueError, "input hex too big for destination int")
while i < s.len:
result = result shl 4 or readHexChar(s[i]).T
inc(i)
proc prefixHex*(x: Hash256): string =
"0x" & toLowerAscii($x)
proc prefixHex*(x: int64 | uint64 | byte | int): string =
toLowerAscii(encodeQuantity(x.uint64).string)
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proc prefixHex*(x: openArray[byte]): string =
"0x" & toHex(x, true)
proc prefixHex*(x: UInt256): string =
"0x" & stint.toHex(x)
proc prefixHex*(x: string): string =
"0x" & toLowerAscii(x)
type
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SomeData* = EthAddress | BloomFilter | BlockNonce
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proc fromJson*(n: JsonNode, name: string, x: var SomeData) =
let node = n[name]
if node.kind == JString:
hexToByteArray(node.getStr(), x)
doAssert(x.prefixHex == toLowerAscii(node.getStr()), name)
else:
hexToByteArray(node["value"].getStr(), x)
doAssert(x.prefixHex == toLowerAscii(node["value"].getStr()), name)
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proc fromJson*(n: JsonNode, name: string, x: var Hash256) =
let node = n[name]
if node.kind == JString:
hexToByteArray(node.getStr(), x.data)
doAssert(x.prefixHex == toLowerAscii(node.getStr()), name)
else:
hexToByteArray(node["value"].getStr(), x.data)
doAssert(x.prefixHex == toLowerAscii(node["value"].getStr()), name)
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proc fromJson*(n: JsonNode, name: string, x: var Blob) =
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x = hexToSeqByte(n[name].getStr())
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doAssert(x.prefixHex == toLowerAscii(n[name].getStr()), name)
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proc fromJson*(n: JsonNode, name: string, x: var UInt256) =
let node = n[name]
if node.kind == JString:
x = UInt256.fromHex(node.getStr())
doAssert(x.prefixHex == toLowerAscii(node.getStr()), name)
else:
x = node.getInt().u256
doAssert($x == $node.getInt, name)
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proc fromJson*(n: JsonNode, name: string, x: var SomeInteger) =
let node = n[name]
if node.kind == JString:
x = hexToInt(node.getStr(), type(x))
doAssert(x.prefixHex == toLowerAscii(node.getStr()), name)
else:
type T = type x
x = T(node.getInt)
doAssert($x == $node.getInt, name)
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proc fromJson*(n: JsonNode, name: string, x: var EthTime) =
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x = initTime(hexToInt(n[name].getStr(), int64), 0)
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doAssert(x.toUnix.prefixHex == toLowerAscii(n[name].getStr()), name)
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proc fromJson*[T](n: JsonNode, name: string, x: var Option[T]) =
if name in n:
var val: T
n.fromJson(name, val)
x = some(val)
proc fromJson*(n: JsonNode, name: string, x: var TxType) =
let node = n[name]
if node.kind == JInt:
x = TxType(node.getInt)
else:
x = hexToInt(node.getStr(), int).TxType
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proc parseBlockHeader*(n: JsonNode): BlockHeader =
n.fromJson "parentHash", result.parentHash
n.fromJson "sha3Uncles", result.ommersHash
n.fromJson "miner", result.coinbase
n.fromJson "stateRoot", result.stateRoot
n.fromJson "transactionsRoot", result.txRoot
n.fromJson "receiptsRoot", result.receiptRoot
n.fromJson "logsBloom", result.bloom
n.fromJson "difficulty", result.difficulty
n.fromJson "number", result.blockNumber
n.fromJson "gasLimit", result.gasLimit
n.fromJson "gasUsed", result.gasUsed
n.fromJson "timestamp", result.timestamp
n.fromJson "extraData", result.extraData
n.fromJson "mixHash", result.mixDigest
n.fromJson "nonce", result.nonce
n.fromJson "baseFeePerGas", result.fee
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if result.baseFee == 0.u256:
# probably geth bug
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result.fee = none(UInt256)
proc parseAccessPair(n: JsonNode): AccessPair =
n.fromJson "address", result.address
let keys = n["storageKeys"]
for kn in keys:
result.storageKeys.add hexToByteArray[32](kn.getStr())
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proc parseTransaction*(n: JsonNode): Transaction =
var tx = Transaction(txType: TxLegacy)
n.fromJson "nonce", tx.nonce
n.fromJson "gasPrice", tx.gasPrice
n.fromJson "gas", tx.gasLimit
if n["to"].kind != JNull:
var to: EthAddress
n.fromJson "to", to
tx.to = some(to)
n.fromJson "value", tx.value
n.fromJson "input", tx.payload
n.fromJson "v", tx.V
n.fromJson "r", tx.R
n.fromJson "s", tx.S
if n.hasKey("type") and n["type"].kind != JNull:
n.fromJson "type", tx.txType
if tx.txType >= TxEip1559:
n.fromJson "maxPriorityFeePerGas", tx.maxPriorityFee
n.fromJson "maxFeePerGas", tx.maxFee
if tx.txType >= TxEip2930:
if n.hasKey("chainId"):
let id = hexToInt(n["chainId"].getStr(), int)
tx.chainId = ChainId(id)
let accessList = n["accessList"]
if accessList.len > 0:
for acn in accessList:
tx.accessList.add parseAccessPair(acn)
tx
proc validateTxSenderAndHash*(n: JsonNode, tx: Transaction) =
var sender = tx.getSender()
var fromAddr: EthAddress
n.fromJson "from", fromAddr
doAssert sender.prefixHex == fromAddr.prefixHex
doAssert n["hash"].getStr() == tx.rlpHash().prefixHex
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proc parseLog(n: JsonNode): Log =
n.fromJson "address", result.address
n.fromJson "data", result.data
let topics = n["topics"]
result.topics = newSeqOfCap[Topic](n.len)
var topicHash: Topic
for tp in topics:
hexToByteArray(tp.getStr(), topicHash)
result.topics.add topicHash
proc parseLogs(n: JsonNode): seq[Log] =
if n.len > 0:
result = newSeqOfCap[Log](n.len)
for log in n:
result.add parseLog(log)
else:
result = @[]
proc parseReceipt*(n: JsonNode): Receipt =
var rec = Receipt(receiptType: LegacyReceipt)
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if n.hasKey("root"):
var hash: Hash256
n.fromJson "root", hash
rec.isHash = true
rec.hash = hash
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else:
var status: int
n.fromJson "status", status
rec.isHash = false
rec.status = status == 1
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n.fromJson "cumulativeGasUsed", rec.cumulativeGasUsed
n.fromJson "logsBloom", rec.bloom
rec.logs = parseLogs(n["logs"])
rec
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proc headerHash*(n: JsonNode): Hash256 =
n.fromJson "hash", result
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proc parseAccount*(n: JsonNode): Account =
n.fromJson "nonce", result.nonce
n.fromJson "balance", result.balance
n.fromJson "storageRoot", result.storageRoot
n.fromJson "codeHash", result.codeHash