255 lines
9.3 KiB
Go
255 lines
9.3 KiB
Go
package full
|
|
|
|
import (
|
|
"bytes"
|
|
|
|
"github.com/multiformats/go-multicodec"
|
|
cbg "github.com/whyrusleeping/cbor-gen"
|
|
"golang.org/x/xerrors"
|
|
|
|
"github.com/filecoin-project/go-state-types/builtin"
|
|
"github.com/filecoin-project/go-state-types/builtin/v10/evm"
|
|
|
|
builtinactors "github.com/filecoin-project/lotus/chain/actors/builtin"
|
|
"github.com/filecoin-project/lotus/chain/state"
|
|
"github.com/filecoin-project/lotus/chain/types"
|
|
"github.com/filecoin-project/lotus/chain/types/ethtypes"
|
|
)
|
|
|
|
// decodePayload is a utility function which decodes the payload using the given codec
|
|
func decodePayload(payload []byte, codec uint64) (ethtypes.EthBytes, error) {
|
|
if len(payload) == 0 {
|
|
return nil, nil
|
|
}
|
|
|
|
switch multicodec.Code(codec) {
|
|
case multicodec.Identity:
|
|
return nil, nil
|
|
case multicodec.DagCbor, multicodec.Cbor:
|
|
buf, err := cbg.ReadByteArray(bytes.NewReader(payload), uint64(len(payload)))
|
|
if err != nil {
|
|
return nil, xerrors.Errorf("decodePayload: failed to decode cbor payload: %w", err)
|
|
}
|
|
return buf, nil
|
|
case multicodec.Raw:
|
|
return ethtypes.EthBytes(payload), nil
|
|
}
|
|
|
|
return nil, xerrors.Errorf("decodePayload: unsupported codec: %d", codec)
|
|
}
|
|
|
|
// buildTraces recursively builds the traces for a given ExecutionTrace by walking the subcalls
|
|
func buildTraces(traces *[]*ethtypes.EthTrace, parent *ethtypes.EthTrace, addr []int, et types.ExecutionTrace, height int64, st *state.StateTree) error {
|
|
// lookup the eth address from the from/to addresses. Note that this may fail but to support
|
|
// this we need to include the ActorID in the trace. For now, just log a warning and skip
|
|
// this trace.
|
|
//
|
|
// TODO: Add ActorID in trace, see https://github.com/filecoin-project/lotus/pull/11100#discussion_r1302442288
|
|
from, err := lookupEthAddress(et.Msg.From, st)
|
|
if err != nil {
|
|
log.Warnf("buildTraces: failed to lookup from address %s: %v", et.Msg.From, err)
|
|
return nil
|
|
}
|
|
to, err := lookupEthAddress(et.Msg.To, st)
|
|
if err != nil {
|
|
log.Warnf("buildTraces: failed to lookup to address %s: %w", et.Msg.To, err)
|
|
return nil
|
|
}
|
|
|
|
// Skip the trace if we never reached the point where we invoked this actor.
|
|
if et.InvokedActor == nil {
|
|
return nil
|
|
}
|
|
|
|
trace := ðtypes.EthTrace{
|
|
Action: ethtypes.EthTraceAction{
|
|
From: from,
|
|
To: to,
|
|
Gas: ethtypes.EthUint64(et.Msg.GasLimit),
|
|
Input: nil,
|
|
Value: ethtypes.EthBigInt(et.Msg.Value),
|
|
|
|
FilecoinFrom: et.Msg.From,
|
|
FilecoinTo: et.Msg.To,
|
|
FilecoinMethod: et.Msg.Method,
|
|
FilecoinCodeCid: et.InvokedActor.State.Code,
|
|
},
|
|
Result: ethtypes.EthTraceResult{
|
|
GasUsed: ethtypes.EthUint64(et.SumGas().TotalGas),
|
|
Output: nil,
|
|
},
|
|
Subtraces: 0, // will be updated by the children once they are added to the trace
|
|
TraceAddress: addr,
|
|
|
|
Parent: parent,
|
|
LastByteCode: nil,
|
|
}
|
|
|
|
trace.SetCallType("call")
|
|
|
|
if et.Msg.Method == builtin.MethodsEVM.InvokeContract {
|
|
log.Debugf("COND1 found InvokeContract call at height: %d", height)
|
|
|
|
// TODO: ignore return errors since actors can send gibberish and we don't want
|
|
// to fail the whole trace in that case
|
|
trace.Action.Input, err = decodePayload(et.Msg.Params, et.Msg.ParamsCodec)
|
|
if err != nil {
|
|
return xerrors.Errorf("buildTraces: %w", err)
|
|
}
|
|
trace.Result.Output, err = decodePayload(et.MsgRct.Return, et.MsgRct.ReturnCodec)
|
|
if err != nil {
|
|
return xerrors.Errorf("buildTraces: %w", err)
|
|
}
|
|
} else if et.Msg.To == builtin.EthereumAddressManagerActorAddr &&
|
|
et.Msg.Method == builtin.MethodsEAM.CreateExternal {
|
|
log.Debugf("COND2 found CreateExternal call at height: %d", height)
|
|
trace.Action.Input, err = decodePayload(et.Msg.Params, et.Msg.ParamsCodec)
|
|
if err != nil {
|
|
return xerrors.Errorf("buildTraces: %w", err)
|
|
}
|
|
|
|
if et.MsgRct.ExitCode.IsSuccess() {
|
|
// ignore return value
|
|
trace.Result.Output = nil
|
|
} else {
|
|
// return value is the error message
|
|
trace.Result.Output, err = decodePayload(et.MsgRct.Return, et.MsgRct.ReturnCodec)
|
|
if err != nil {
|
|
return xerrors.Errorf("buildTraces: %w", err)
|
|
}
|
|
}
|
|
|
|
// treat this as a contract creation
|
|
trace.SetCallType("create")
|
|
} else {
|
|
// we are going to assume a native method, but we may change it in one of the edge cases below
|
|
// TODO: only do this if we know it's a native method (optimization)
|
|
trace.Action.Input = encodeFilecoinParamsAsABI(et.Msg.Method, et.Msg.ParamsCodec, et.Msg.Params)
|
|
trace.Result.Output = encodeFilecoinReturnAsABI(et.MsgRct.ExitCode, et.MsgRct.ReturnCodec, et.MsgRct.Return)
|
|
}
|
|
|
|
// TODO: is it OK to check this here or is this only specific to certain edge case (evm to evm)?
|
|
if et.Msg.ReadOnly {
|
|
trace.SetCallType("staticcall")
|
|
}
|
|
|
|
// there are several edge cases that require special handling when displaying the traces. Note that while iterating over
|
|
// the traces we update the trace backwards (through the parent pointer)
|
|
if parent != nil {
|
|
// Handle Native actor creation
|
|
//
|
|
// Actor A calls to the init actor on method 2 and The init actor creates the target actor B then calls it on method 1
|
|
if parent.Action.FilecoinTo == builtin.InitActorAddr &&
|
|
parent.Action.FilecoinMethod == builtin.MethodsInit.Exec &&
|
|
et.Msg.Method == builtin.MethodConstructor {
|
|
log.Debugf("COND3 Native actor creation! method:%d, code:%s, height:%d", et.Msg.Method, et.InvokedActor.State.Code.String(), height)
|
|
parent.SetCallType("create")
|
|
parent.Action.To = to
|
|
parent.Action.Input = []byte{0xFE}
|
|
parent.Result.Output = nil
|
|
|
|
// there should never be any subcalls when creating a native actor
|
|
//
|
|
// TODO: add support for native actors calling another when created
|
|
return nil
|
|
}
|
|
|
|
// Handle EVM contract creation
|
|
//
|
|
// To detect EVM contract creation we need to check for the following sequence of events:
|
|
//
|
|
// 1) EVM contract A calls the EAM (Ethereum Address Manager) on method 2 (create) or 3 (create2).
|
|
// 2) The EAM calls the init actor on method 3 (Exec4).
|
|
// 3) The init actor creates the target actor B then calls it on method 1.
|
|
if parent.Parent != nil {
|
|
calledCreateOnEAM := parent.Parent.Action.FilecoinTo == builtin.EthereumAddressManagerActorAddr &&
|
|
(parent.Parent.Action.FilecoinMethod == builtin.MethodsEAM.Create || parent.Parent.Action.FilecoinMethod == builtin.MethodsEAM.Create2)
|
|
eamCalledInitOnExec4 := parent.Action.FilecoinTo == builtin.InitActorAddr &&
|
|
parent.Action.FilecoinMethod == builtin.MethodsInit.Exec4
|
|
initCreatedActor := trace.Action.FilecoinMethod == builtin.MethodConstructor
|
|
|
|
// TODO: We need to handle failures in contract creations and support resurrections on an existing but dead EVM actor)
|
|
if calledCreateOnEAM && eamCalledInitOnExec4 && initCreatedActor {
|
|
log.Debugf("COND4 EVM contract creation method:%d, code:%s, height:%d", et.Msg.Method, et.InvokedActor.State.Code.String(), height)
|
|
|
|
if parent.Parent.Action.FilecoinMethod == builtin.MethodsEAM.Create {
|
|
parent.Parent.SetCallType("create")
|
|
} else {
|
|
parent.Parent.SetCallType("create2")
|
|
}
|
|
|
|
// update the parent.parent to make this
|
|
parent.Parent.Action.To = trace.Action.To
|
|
parent.Parent.Subtraces = 0
|
|
|
|
// delete the parent (the EAM) and skip the current trace (init)
|
|
*traces = (*traces)[:len(*traces)-1]
|
|
|
|
return nil
|
|
}
|
|
}
|
|
|
|
if builtinactors.IsEvmActor(parent.Action.FilecoinCodeCid) {
|
|
// Handle delegate calls
|
|
//
|
|
// 1) Look for trace from an EVM actor to itself on InvokeContractDelegate, method 6.
|
|
// 2) Check that the previous trace calls another actor on method 3 (GetByteCode) and they are at the same level (same parent)
|
|
// 3) Treat this as a delegate call to actor A.
|
|
if parent.LastByteCode != nil && trace.Action.From == trace.Action.To &&
|
|
trace.Action.FilecoinMethod == builtin.MethodsEVM.InvokeContractDelegate {
|
|
log.Debugf("COND7 found delegate call, height: %d", height)
|
|
prev := parent.LastByteCode
|
|
if prev.Action.From == trace.Action.From && prev.Action.FilecoinMethod == builtin.MethodsEVM.GetBytecode && prev.Parent == trace.Parent {
|
|
trace.SetCallType("delegatecall")
|
|
trace.Action.To = prev.Action.To
|
|
|
|
var dp evm.DelegateCallParams
|
|
err := dp.UnmarshalCBOR(bytes.NewReader(et.Msg.Params))
|
|
if err != nil {
|
|
return xerrors.Errorf("failed UnmarshalCBOR: %w", err)
|
|
}
|
|
trace.Action.Input = dp.Input
|
|
|
|
trace.Result.Output, err = decodePayload(et.MsgRct.Return, et.MsgRct.ReturnCodec)
|
|
if err != nil {
|
|
return xerrors.Errorf("failed decodePayload: %w", err)
|
|
}
|
|
}
|
|
} else {
|
|
// Handle EVM call special casing
|
|
//
|
|
// Any outbound call from an EVM actor on methods 1-1023 are side-effects from EVM instructions
|
|
// and should be dropped from the trace.
|
|
if et.Msg.Method > 0 &&
|
|
et.Msg.Method <= 1023 {
|
|
log.Debugf("Infof found outbound call from an EVM actor on method 1-1023 method:%d, code:%s, height:%d", et.Msg.Method, parent.Action.FilecoinCodeCid.String(), height)
|
|
|
|
if et.Msg.Method == builtin.MethodsEVM.GetBytecode {
|
|
// save the last bytecode trace to handle delegate calls
|
|
parent.LastByteCode = trace
|
|
}
|
|
|
|
return nil
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
// we are adding trace to the traces so update the parent subtraces count as it was originally set to zero
|
|
if parent != nil {
|
|
parent.Subtraces++
|
|
}
|
|
|
|
*traces = append(*traces, trace)
|
|
|
|
for i, call := range et.Subcalls {
|
|
err := buildTraces(traces, trace, append(addr, i), call, height, st)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|