nimbus-eth1/nimbus/vm_state.nim

135 lines
4.6 KiB
Nim

# Nimbus
# Copyright (c) 2018 Status Research & Development GmbH
# Licensed under either of
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
# at your option. This file may not be copied, modified, or distributed except according to those terms.
import
macros, strformat, tables, sets, options,
eth/common,
vm/interpreter/[vm_forks, gas_costs],
./constants, ./db/[db_chain, state_db],
./utils, json, vm_types, vm/transaction_tracer
proc newAccessLogs*: AccessLogs =
AccessLogs(reads: initTable[string, string](), writes: initTable[string, string]())
proc update*[K, V](t: var Table[K, V], elements: Table[K, V]) =
for k, v in elements:
t[k] = v
proc `$`*(vmState: BaseVMState): string =
if vmState.isNil:
result = "nil"
else:
result = &"VMState {vmState.name}:\n header: {vmState.blockHeader}\n chaindb: {vmState.chaindb}"
proc init*(self: BaseVMState, prevStateRoot: Hash256, header: BlockHeader,
chainDB: BaseChainDB, tracerFlags: set[TracerFlags] = {}) =
self.prevHeaders = @[]
self.name = "BaseVM"
self.accessLogs = newAccessLogs()
self.blockHeader = header
self.chaindb = chainDB
self.tracer.initTracer(tracerFlags)
self.tracingEnabled = TracerFlags.EnableTracing in tracerFlags
self.logEntries = @[]
self.accountDb = newAccountStateDB(chainDB.db, prevStateRoot, chainDB.pruneTrie)
self.touchedAccounts = initHashSet[EthAddress]()
proc newBaseVMState*(prevStateRoot: Hash256, header: BlockHeader,
chainDB: BaseChainDB, tracerFlags: set[TracerFlags] = {}): BaseVMState =
new result
result.init(prevStateRoot, header, chainDB, tracerFlags)
proc setupTxContext*(vmState: BaseVMState, origin: EthAddress, gasPrice: GasInt, forkOverride=none(Fork)) =
## this proc will be called each time a new transaction
## is going to be executed
vmState.txOrigin = origin
vmState.txGasPrice = gasPrice
vmState.fork =
if forkOverride.isSome:
forkOverride.get
else:
vmState.blockHeader.blockNumber.toFork
vmState.gasCosts = vmState.fork.forkToSchedule
method blockhash*(vmState: BaseVMState): Hash256 {.base, gcsafe.} =
vmState.blockHeader.hash
method coinbase*(vmState: BaseVMState): EthAddress {.base, gcsafe.} =
vmState.blockHeader.coinbase
method timestamp*(vmState: BaseVMState): EthTime {.base, gcsafe.} =
vmState.blockHeader.timestamp
method blockNumber*(vmState: BaseVMState): BlockNumber {.base, gcsafe.} =
# it should return current block number
# and not head.blockNumber
vmState.blockHeader.blockNumber
method difficulty*(vmState: BaseVMState): UInt256 {.base, gcsafe.} =
vmState.blockHeader.difficulty
method gasLimit*(vmState: BaseVMState): GasInt {.base, gcsafe.} =
vmState.blockHeader.gasLimit
method getAncestorHash*(vmState: BaseVMState, blockNumber: BlockNumber): Hash256 {.base, gcsafe.} =
var ancestorDepth = vmState.blockHeader.blockNumber - blockNumber - 1
if ancestorDepth >= constants.MAX_PREV_HEADER_DEPTH:
return
if blockNumber >= vmState.blockHeader.blockNumber:
return
result = vmState.chainDB.getBlockHash(blockNumber)
#TODO: should we use deque here?
# someday we may revive this code when
# we already have working miner
when false:
let idx = ancestorDepth.toInt
if idx >= vmState.prevHeaders.len:
return
var header = vmState.prevHeaders[idx]
result = header.hash
proc readOnlyStateDB*(vmState: BaseVMState): ReadOnlyStateDB {.inline.} =
ReadOnlyStateDB(vmState.accountDb)
template mutateStateDB*(vmState: BaseVMState, body: untyped) =
block:
var db {.inject.} = vmState.accountDb
body
proc getTracingResult*(vmState: BaseVMState): JsonNode =
doAssert(vmState.tracingEnabled)
vmState.tracer.trace
proc addLogs*(vmState: BaseVMState, logs: seq[Log]) =
shallowCopy(vmState.logEntries, logs)
proc getAndClearLogEntries*(vmState: BaseVMState): seq[Log] =
shallowCopy(result, vmState.logEntries)
vmState.logEntries = @[]
proc enableTracing*(vmState: BaseVMState) =
vmState.tracingEnabled = true
proc disableTracing*(vmState: BaseVMState) =
vmState.tracingEnabled = false
iterator tracedAccounts*(vmState: BaseVMState): EthAddress =
for acc in vmState.tracer.accounts:
yield acc
iterator tracedAccountsPairs*(vmState: BaseVMState): (int, EthAddress) =
var idx = 0
for acc in vmState.tracer.accounts:
yield (idx, acc)
inc idx
proc removeTracedAccounts*(vmState: BaseVMState, accounts: varargs[EthAddress]) =
for acc in accounts:
vmState.tracer.accounts.excl acc