nimbus-eth1/nimbus/vm/transaction_tracer.nim

96 lines
2.9 KiB
Nim

import
json, strutils, sets,
chronicles, nimcrypto, eth_common, stint,
../vm_types, memory, stack, ../db/[db_chain, state_db],
eth_trie/hexary, ./message, ranges/typedranges,
./interpreter/opcode_values
logScope:
topics = "vm opcode"
proc initTracer*(tracer: var TransactionTracer, flags: set[TracerFlags] = {}) =
tracer.trace = newJObject()
# make appear at the top of json object
tracer.trace["gas"] = %0
tracer.trace["failed"] = %false
tracer.trace["returnValue"] = %""
tracer.trace["structLogs"] = newJArray()
tracer.flags = flags
tracer.accounts = initSet[EthAddress]()
proc traceOpCodeStarted*(tracer: var TransactionTracer, c: BaseComputation, op: Op) =
if unlikely tracer.trace.isNil:
tracer.initTracer()
let j = newJObject()
tracer.trace["structLogs"].add(j)
j["op"] = %(($op).toUpperAscii)
j["pc"] = %(c.code.pc - 1)
j["depth"] = %1 # stub
j["gas"] = %c.gasMeter.gasRemaining
tracer.gasRemaining = c.gasMeter.gasRemaining
# log stack
if TracerFlags.DisableStack notin tracer.flags:
let st = newJArray()
for v in c.stack.values:
st.add(%v.dumpHex())
j["stack"] = st
# log memory
if TracerFlags.DisableMemory notin tracer.flags:
let mem = newJArray()
const chunkLen = 32
let numChunks = c.memory.len div chunkLen
for i in 0 ..< numChunks:
mem.add(%c.memory.bytes.toOpenArray(i * chunkLen, (i + 1) * chunkLen - 1).toHex())
j["memory"] = mem
if TracerFlags.EnableAccount in tracer.flags:
case op
of Call, CallCode, DelegateCall, StaticCall:
assert(c.stack.values.len > 2)
tracer.accounts.incl c.stack[^2, EthAddress]
of ExtCodeCopy, ExtCodeSize, Balance, SelfDestruct:
assert(c.stack.values.len > 1)
tracer.accounts.incl c.stack[^1, EthAddress]
else:
discard
proc traceOpCodeEnded*(tracer: var TransactionTracer, c: BaseComputation, op: Op) =
let j = tracer.trace["structLogs"].elems[^1]
# TODO: figure out how to get storage
# when contract execution interrupted by exception
if TracerFlags.DisableStorage notin tracer.flags:
var storage = newJObject()
var stateDB = c.vmState.accountDb
for key, value in stateDB.storage(c.msg.storageAddress):
storage[key.dumpHex] = %(value.dumpHex)
j["storage"] = storage
j["gasCost"] = %(tracer.gasRemaining - c.gasMeter.gasRemaining)
if op in {Return, Revert}:
let returnValue = %("0x" & toHex(c.rawOutput, true))
j["returnValue"] = returnValue
tracer.trace["returnValue"] = returnValue
trace "Op", json = j.pretty()
proc traceError*(tracer: var TransactionTracer, c: BaseComputation) =
let j = tracer.trace["structLogs"].elems[^1]
# TODO: figure out how to get gasCost
# when contract execution failed before traceOpCodeEnded called
# because exception raised
#j["gasCost"] = %
j["error"] = %(c.error.info)
tracer.trace["failed"] = %true
trace "Error", json = j.pretty()