nimbus-eth1/nimbus/stateless_runner.nim

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import
chronos,
options,
times,
nimcrypto,
stew/results,
json_rpc/rpcclient,
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eth/[common/eth_types, p2p],
core/chain/[chain_desc],
core/executor/process_block,
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db/[db_chain, select_backend, accounts_cache],
eth/trie/[db, trie_defs],
evm/async/[data_sources, operations, data_sources/json_rpc_data_source],
./vm_state, ./vm_types,
chronicles
from strutils import parseInt, startsWith
from common/common import initializeEmptyDb
proc coinbasesOfThisBlockAndUncles(header: BlockHeader, body: BlockBody): seq[EthAddress] =
result.add header.coinbase
for uncle in body.uncles:
result.add(uncle.coinbase)
proc createVmStateForStatelessMode*(com: CommonRef, header: BlockHeader, body: BlockBody,
parentHeader: BlockHeader, asyncFactory: AsyncOperationFactory): Result[BaseVMState, string]
{.inline.} =
let vmState = BaseVMState()
if not vmState.statelessInit(parentHeader, header, com, asyncFactory, {}):
return err("Cannot initialise VmState for block number " & $(header.blockNumber))
waitFor(ifNecessaryGetAccounts(vmState, coinbasesOfThisBlockAndUncles(header, body)))
ok(vmState)
proc statelesslyRunBlock*(asyncDataSource: AsyncDataSource, com: CommonRef, header: BlockHeader, body: BlockBody): Result[Hash256, string] =
try:
let t0 = now()
# FIXME-Adam: this doesn't feel like the right place for this; where should it go?
com.db.db.put(emptyRlpHash.data, emptyRlp)
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let blockHash: Hash256 = header.blockHash
let asyncFactory = AsyncOperationFactory(maybeDataSource: some(asyncDataSource))
let parentHeader = waitFor(asyncDataSource.fetchBlockHeaderWithHash(header.parentHash))
com.db.persistHeaderToDbWithoutSetHeadOrScore(parentHeader)
info("statelessly running block", blockNumber=header.blockNumber, blockHash=blockHash, parentHash=header.parentHash, parentStateRoot=parentHeader.stateRoot, desiredNewStateRoot=header.stateRoot)
let vmState = createVmStateForStatelessMode(com, header, body, parentHeader, asyncFactory).get
let vres = processBlockNotPoA(vmState, header, body)
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let elapsedTime = now() - t0
let headerStateRoot = header.stateRoot
let vmStateRoot = rootHash(vmState.stateDB)
info("finished statelessly running the block", vres=vres, elapsedTime=elapsedTime, durationSpentDoingFetches=durationSpentDoingFetches, fetchCounter=fetchCounter, headerStateRoot=headerStateRoot, vmStateRoot=vmStateRoot)
if headerStateRoot != vmStateRoot:
return err("State roots do not match: header says " & $(headerStateRoot) & ", vmState says " & $(vmStateRoot))
else:
if vres == ValidationResult.OK:
return ok(blockHash)
else:
return err("Error while statelessly running a block")
except:
let ex = getCurrentException()
echo getStackTrace(ex)
error "Got an exception while statelessly running a block", exMsg = ex.msg
return err("Error while statelessly running a block: " & $(ex.msg))
proc statelesslyRunBlock*(asyncDataSource: AsyncDataSource, com: CommonRef, blockHash: Hash256): Result[Hash256, string] =
let (header, body) = waitFor(asyncDataSource.fetchBlockHeaderAndBodyWithHash(blockHash))
let r = statelesslyRunBlock(asyncDataSource, com, header, body)
if r.isErr:
error("stateless execution failed", hash=blockHash, error=r.error)
else:
info("stateless execution succeeded", hash=blockHash, resultingHash=r.value)
return r
proc fetchBlockHeaderAndBodyForHashOrNumber(asyncDataSource: AsyncDataSource, hashOrNum: string): Future[(BlockHeader, BlockBody)] {.async.} =
if hashOrNum.startsWith("0x"):
return await asyncDataSource.fetchBlockHeaderAndBodyWithHash(hashOrNum.toHash)
else:
return await asyncDataSource.fetchBlockHeaderAndBodyWithNumber(u256(parseInt(hashOrNum)))
proc statelesslyRunSequentialBlocks*(asyncDataSource: AsyncDataSource, com: CommonRef, initialBlockNumber: BlockNumber): Result[Hash256, string] =
info("sequential stateless execution beginning", initialBlockNumber=initialBlockNumber)
var n = initialBlockNumber
while true:
let (header, body) = waitFor(asyncDataSource.fetchBlockHeaderAndBodyWithNumber(n))
let r = statelesslyRunBlock(asyncDataSource, com, header, body)
if r.isErr:
error("stateless execution failed", n=n, h=header.blockHash, error=r.error)
return r
else:
info("stateless execution succeeded", n=n, h=header.blockHash, resultingHash=r.value)
n = n + 1
proc statelesslyRunBlock*(asyncDataSource: AsyncDataSource, com: CommonRef, hashOrNum: string): Result[Hash256, string] =
let (header, body) = waitFor(fetchBlockHeaderAndBodyForHashOrNumber(asyncDataSource, hashOrNum))
return statelesslyRunBlock(asyncDataSource, com, header, body)
proc statelesslyRunTransaction*(asyncDataSource: AsyncDataSource, com: CommonRef, headerHash: Hash256, tx: Transaction) =
let t0 = now()
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let (header, body) = waitFor(asyncDataSource.fetchBlockHeaderAndBodyWithHash(headerHash))
# FIXME-Adam: this doesn't feel like the right place for this; where should it go?
com.db.db.put(emptyRlpHash.data, emptyRlp)
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#let blockHash: Hash256 = header.blockHash
let transaction = com.db.db.beginTransaction()
defer: transaction.rollback() # intentionally throwing away the result of this execution
let asyncFactory = AsyncOperationFactory(maybeDataSource: some(asyncDataSource))
let parentHeader = waitFor(asyncDataSource.fetchBlockHeaderWithHash(header.parentHash))
com.db.persistHeaderToDbWithoutSetHeadOrScore(parentHeader)
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let vmState = createVmStateForStatelessMode(com, header, body, parentHeader, asyncFactory).get
let r = processTransactions(vmState, header, @[tx])
if r.isErr:
error("error statelessly running tx", tx=tx, error=r.error)
else:
let elapsedTime = now() - t0
let gasUsed = vmState.cumulativeGasUsed
info("finished statelessly running the tx", elapsedTime=elapsedTime, gasUsed=gasUsed)