nimbus-eth1/nimbus/rpc/rpc_utils.nim

329 lines
11 KiB
Nim

# Nimbus
# Copyright (c) 2018 Status Research & Development GmbH
# Licensed under either of
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
# * MIT license ([LICENSE-MIT](LICENSE-MIT))
# at your option.
# This file may not be copied, modified, or distributed except according to
# those terms.
import hexstrings, eth/[common, rlp, keys, trie/db], stew/byteutils, nimcrypto,
../db/[db_chain, accounts_cache], strutils, algorithm, options, times, json,
../constants, stint, hexstrings, rpc_types, ../config,
../vm_state_transactions, ../vm_state, ../vm_types, ../vm/interpreter/vm_forks,
../vm/computation, ../p2p/executor, ../utils, ../transaction
type
UnsignedTx* = object
nonce* : AccountNonce
gasPrice*: GasInt
gasLimit*: GasInt
to* {.rlpCustomSerialization.}: EthAddress
value * : UInt256
payload* : Blob
contractCreation* {.rlpIgnore.}: bool
CallData* = object
source: EthAddress
to: EthAddress
gas: GasInt
gasPrice: GasInt
value: UInt256
data: seq[byte]
contractCreation: bool
proc read(rlp: var Rlp, t: var UnsignedTx, _: type EthAddress): EthAddress {.inline.} =
if rlp.blobLen != 0:
result = rlp.read(EthAddress)
else:
t.contractCreation = true
proc append(rlpWriter: var RlpWriter, t: UnsignedTx, a: EthAddress) {.inline.} =
if t.contractCreation:
rlpWriter.append("")
else:
rlpWriter.append(a)
func toAddress*(value: EthAddressStr): EthAddress = hexToPaddedByteArray[20](value.string)
func toHash*(value: array[32, byte]): Hash256 {.inline.} =
result.data = value
func toHash*(value: EthHashStr): Hash256 {.inline.} =
result = hexToPaddedByteArray[32](value.string).toHash
func hexToInt*(s: string, T: typedesc[SomeInteger]): T =
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 headerFromTag*(chain: BaseChainDB, blockTag: string): BlockHeader =
let tag = blockTag.toLowerAscii
case tag
of "latest": result = chain.getCanonicalHead()
of "earliest": result = chain.getBlockHeader(GENESIS_BLOCK_NUMBER)
of "pending":
#TODO: Implement get pending block
raise newException(ValueError, "Pending tag not yet implemented")
else:
# Raises are trapped and wrapped in JSON when returned to the user.
tag.validateHexQuantity
let blockNum = stint.fromHex(UInt256, tag)
result = chain.getBlockHeader(blockNum.toBlockNumber)
proc calculateMedianGasPrice*(chain: BaseChainDB): GasInt =
var prices = newSeqOfCap[GasInt](64)
let header = chain.getCanonicalHead()
for encodedTx in chain.getBlockTransactionData(header.txRoot):
let tx = rlp.decode(encodedTx, Transaction)
prices.add(tx.gasPrice)
if prices.len > 0:
sort(prices)
let middle = prices.len div 2
if prices.len mod 2 == 0:
# prevent overflow
let price = prices[middle].uint64 + prices[middle - 1].uint64
result = (price div 2).GasInt
else:
result = prices[middle]
proc unsignedTx*(tx: TxSend, chain: BaseChainDB, defaultNonce: AccountNonce): UnsignedTx =
if tx.to.isSome:
result.to = toAddress(tx.to.get())
result.contractCreation = false
else:
result.contractCreation = true
if tx.gas.isSome:
result.gasLimit = hexToInt(tx.gas.get().string, GasInt)
else:
result.gasLimit = 90000.GasInt
if tx.gasPrice.isSome:
result.gasPrice = hexToInt(tx.gasPrice.get().string, GasInt)
else:
result.gasPrice = calculateMedianGasPrice(chain)
if tx.value.isSome:
result.value = UInt256.fromHex(tx.value.get().string)
else:
result.value = 0.u256
if tx.nonce.isSome:
result.nonce = hexToInt(tx.nonce.get().string, AccountNonce)
else:
result.nonce = defaultNonce
result.payload = hexToSeqByte(tx.data.string)
func rlpEncode(tx: UnsignedTx, chainId: ChainId): auto =
rlp.encode(Transaction(
accountNonce: tx.nonce,
gasPrice: tx.gasPrice,
gasLimit: tx.gasLimit,
to: tx.to,
value: tx.value,
payload: tx.payload,
isContractCreation: tx.contractCreation,
V: chainId.byte,
R: 0.u256,
S: 0.u256
))
proc signTransaction*(tx: UnsignedTx, chain: BaseChainDB, privateKey: PrivateKey): Transaction =
let eip155 = chain.currentBlock >= chain.config.eip155Block
let rlpTx = if eip155:
rlpEncode(tx, chain.config.chainId)
else:
rlp.encode(tx)
let sig = sign(privateKey, rlpTx).toRaw
let v = if eip155:
byte(sig[64].uint + chain.config.chainId.uint * 2'u + 35'u)
else:
sig[64] + 27.byte
result = Transaction(
accountNonce: tx.nonce,
gasPrice: tx.gasPrice,
gasLimit: tx.gasLimit,
to: tx.to,
value: tx.value,
payload: tx.payload,
isContractCreation: tx.contractCreation,
V: v,
R: Uint256.fromBytesBE(sig[0..31]),
S: Uint256.fromBytesBE(sig[32..63])
)
proc callData*(call: EthCall, callMode: bool = true, chain: BaseChainDB): CallData =
if call.source.isSome:
result.source = toAddress(call.source.get)
if call.to.isSome:
result.to = toAddress(call.to.get)
else:
if callMode:
raise newException(ValueError, "call.to required for eth_call operation")
else:
result.contractCreation = true
if call.gas.isSome:
result.gas = hexToInt(call.gas.get.string, GasInt)
if call.gasPrice.isSome:
result.gasPrice = hexToInt(call.gasPrice.get.string, GasInt)
else:
if not callMode:
result.gasPrice = calculateMedianGasPrice(chain)
if call.value.isSome:
result.value = UInt256.fromHex(call.value.get.string)
if call.data.isSome:
result.data = hexToSeqByte(call.data.get.string)
proc setupComputation(vmState: BaseVMState, call: CallData, fork: Fork) : Computation =
vmState.setupTxContext(
origin = call.source,
gasPrice = call.gasPrice,
forkOverride = some(fork)
)
let msg = Message(
kind: evmcCall,
depth: 0,
gas: call.gas,
sender: call.source,
contractAddress: call.to,
codeAddress: call.to,
value: call.value,
data: call.data
)
result = newComputation(vmState, msg)
proc doCall*(call: CallData, header: BlockHeader, chain: BaseChainDB): HexDataStr =
var
# we use current header stateRoot, unlike block validation
# which use previous block stateRoot
vmState = newBaseVMState(header.stateRoot, header, chain)
fork = toFork(chain.config, header.blockNumber)
comp = setupComputation(vmState, call, fork)
comp.execComputation()
result = hexDataStr(comp.output)
# TODO: handle revert and error
# TODO: handle contract ABI
proc estimateGas*(call: CallData, header: BlockHeader, chain: BaseChainDB, haveGasLimit: bool): HexQuantityStr =
var
# we use current header stateRoot, unlike block validation
# which use previous block stateRoot
vmState = newBaseVMState(header.stateRoot, header, chain)
fork = toFork(chain.config, header.blockNumber)
tx = Transaction(
accountNonce: vmState.accountdb.getNonce(call.source),
gasPrice: call.gasPrice,
gasLimit: if haveGasLimit: call.gas else: header.gasLimit - vmState.cumulativeGasUsed,
to : call.to,
value : call.value,
payload : call.data,
isContractCreation: call.contractCreation
)
var dbTx = chain.db.beginTransaction()
defer: dbTx.dispose()
let gasUsed = processTransaction(tx, call.source, vmState, fork)
result = encodeQuantity(gasUsed.uint64)
dbTx.dispose()
# TODO: handle revert and error
proc populateTransactionObject*(tx: Transaction, header: BlockHeader, txIndex: int): TransactionObject =
result.blockHash = some(header.hash)
result.blockNumber = some(encodeQuantity(header.blockNumber))
result.`from` = tx.getSender()
result.gas = encodeQuantity(tx.gasLimit.uint64)
result.gasPrice = encodeQuantity(tx.gasPrice.uint64)
result.hash = tx.rlpHash
result.input = tx.payLoad
result.nonce = encodeQuantity(tx.accountNonce.uint64)
if not tx.isContractCreation:
result.to = some(tx.to)
result.transactionIndex = some(encodeQuantity(txIndex.uint64))
result.value = encodeQuantity(tx.value)
result.v = encodeQuantity(tx.V.uint)
result.r = encodeQuantity(tx.R)
result.s = encodeQuantity(tx.S)
proc populateBlockObject*(header: BlockHeader, chain: BaseChainDB, fullTx: bool, isUncle = false): BlockObject =
let blockHash = header.blockHash
result.number = some(encodeQuantity(header.blockNumber))
result.hash = some(blockHash)
result.parentHash = header.parentHash
result.nonce = some(hexDataStr(header.nonce))
result.sha3Uncles = header.ommersHash
result.logsBloom = some(header.bloom)
result.transactionsRoot = header.txRoot
result.stateRoot = header.stateRoot
result.receiptsRoot = header.receiptRoot
result.miner = header.coinbase
result.difficulty = encodeQuantity(header.difficulty)
result.extraData = hexDataStr(header.extraData)
# discard sizeof(seq[byte]) of extraData and use actual length
let size = sizeof(BlockHeader) - sizeof(Blob) + header.extraData.len
result.size = encodeQuantity(size.uint)
result.gasLimit = encodeQuantity(header.gasLimit.uint64)
result.gasUsed = encodeQuantity(header.gasUsed.uint64)
result.timestamp = encodeQuantity(header.timeStamp.toUnix.uint64)
if not isUncle:
result.totalDifficulty = encodeQuantity(chain.getScore(blockHash))
result.uncles = chain.getUncleHashes(header)
if fullTx:
var i = 0
for tx in chain.getBlockTransactions(header):
result.transactions.add %(populateTransactionObject(tx, header, i))
inc i
else:
for x in chain.getBlockTransactionHashes(header):
result.transactions.add %(x)
proc populateReceipt*(receipt: Receipt, gasUsed: GasInt, tx: Transaction, txIndex: int, header: BlockHeader): ReceiptObject =
result.transactionHash = tx.rlpHash
result.transactionIndex = encodeQuantity(txIndex.uint)
result.blockHash = header.hash
result.blockNumber = encodeQuantity(header.blockNumber)
result.`from` = tx.getSender()
if tx.isContractCreation:
result.to = some(tx.to)
result.cumulativeGasUsed = encodeQuantity(receipt.cumulativeGasUsed.uint64)
result.gasUsed = encodeQuantity(gasUsed.uint64)
if tx.isContractCreation:
var sender: EthAddress
if tx.getSender(sender):
let contractAddress = generateAddress(sender, tx.accountNonce)
result.contractAddress = some(contractAddress)
result.logs = receipt.logs
result.logsBloom = receipt.bloom
# post-transaction stateroot (pre Byzantium).
if receipt.hasStateRoot:
result.root = some(receipt.stateRoot)
else:
# 1 = success, 0 = failure.
result.status = some(receipt.status)