Translate call input/output into Solidity ABI
This commit is contained in:
Fridrik Asmundsson
parent
1b0f54a61b
commit
c1eaa2f864
@ -1,14 +1,22 @@
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package full
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import (
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"bytes"
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"context"
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"encoding/binary"
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"encoding/hex"
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"fmt"
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"io"
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"go.uber.org/fx"
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"golang.org/x/xerrors"
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"github.com/filecoin-project/go-state-types/abi"
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"github.com/filecoin-project/go-state-types/exitcode"
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"github.com/ipfs/go-cid"
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builtin2 "github.com/filecoin-project/go-state-types/builtin"
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builtinactors "github.com/filecoin-project/lotus/chain/actors/builtin"
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"github.com/filecoin-project/lotus/api"
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"github.com/filecoin-project/lotus/chain/stmgr"
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@ -69,6 +77,9 @@ type Action struct {
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Gas ethtypes.EthUint64 `json:"gas"`
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Input string `json:"input"`
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Value ethtypes.EthBigInt `json:"value"`
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Method abi.MethodNum `json:"method"`
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CodeCid cid.Cid `json:"codeCid"`
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}
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type Result struct {
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@ -136,7 +147,7 @@ func (e *EthTrace) TraceBlock(ctx context.Context, blkNum string) (interface{},
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}
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traces := []*Trace{}
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buildTraces(&traces, []int{}, ir.ExecutionTrace)
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buildTraces(&traces, []int{}, ir.ExecutionTrace, nil, int64(ts.Height()))
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traceBlocks := make([]*TraceBlock, 0, len(trace))
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for _, trace := range traces {
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@ -193,7 +204,7 @@ func (e *EthTrace) TraceReplayBlockTransactions(ctx context.Context, blkNum stri
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VmTrace: nil,
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}
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buildTraces(&t.Trace, []int{}, ir.ExecutionTrace)
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buildTraces(&t.Trace, []int{}, ir.ExecutionTrace, nil, int64(ts.Height()))
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allTraces = append(allTraces, &t)
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}
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@ -201,19 +212,97 @@ func (e *EthTrace) TraceReplayBlockTransactions(ctx context.Context, blkNum stri
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return allTraces, nil
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}
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func write_padded[T any](w io.Writer, data T, size int) error {
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tmp := &bytes.Buffer{}
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// first write data to tmp buffer to get the size
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err := binary.Write(tmp, binary.BigEndian, data)
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if err != nil {
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return err
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}
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if tmp.Len() > size {
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return fmt.Errorf("data is larger than size")
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}
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// write tailing zeros to pad up to size
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cnt := size - tmp.Len()
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for i := 0; i < cnt; i++ {
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err = binary.Write(w, binary.BigEndian, uint8(0))
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if err != nil {
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return err
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}
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}
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// finally write the actual value
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err = binary.Write(w, binary.BigEndian, tmp.Bytes())
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if err != nil {
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return err
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}
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return nil
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}
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func handle_filecoin_method_input(method abi.MethodNum, codec uint64, params []byte) ([]byte, error) {
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NATIVE_METHOD_SELECTOR := []byte{0x86, 0x8e, 0x10, 0xc4}
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EVM_WORD_SIZE := 32
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staticArgs := []uint64{
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uint64(method),
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codec,
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uint64(EVM_WORD_SIZE) * 3,
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uint64(len(params)),
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}
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totalWords := len(staticArgs) + (len(params) / EVM_WORD_SIZE)
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if len(params)%EVM_WORD_SIZE != 0 {
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totalWords += 1
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}
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len := 4 + totalWords*EVM_WORD_SIZE
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w := &bytes.Buffer{}
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err := binary.Write(w, binary.BigEndian, NATIVE_METHOD_SELECTOR)
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if err != nil {
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return nil, err
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}
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for _, arg := range staticArgs {
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err := write_padded(w, arg, 32)
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if err != nil {
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return nil, err
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}
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}
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binary.Write(w, binary.BigEndian, params)
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remain := len - w.Len()
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for i := 0; i < remain; i++ {
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binary.Write(w, binary.BigEndian, uint8(0))
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}
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return w.Bytes(), nil
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}
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func handle_filecoin_method_output(exitCode exitcode.ExitCode, codec uint64, data []byte) ([]byte, error) {
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w := &bytes.Buffer{}
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values := []interface{}{uint32(exitCode), codec, uint32(w.Len()), uint32(len(data))}
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for _, v := range values {
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err := write_padded(w, v, 32)
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if err != nil {
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return nil, err
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}
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}
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binary.Write(w, binary.BigEndian, []byte(data))
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return w.Bytes(), nil
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}
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// buildTraces recursively builds the traces for a given ExecutionTrace by walking the subcalls
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func buildTraces(traces *[]*Trace, addr []int, et types.ExecutionTrace) {
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func buildTraces(traces *[]*Trace, addr []int, et types.ExecutionTrace, parentEt *types.ExecutionTrace, height int64) {
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callType := "call"
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if et.Msg.ReadOnly {
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callType = "staticcall"
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}
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// TODO: add check for determining if this this should be delegatecall
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if false {
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callType = "delegatecall"
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}
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*traces = append(*traces, &Trace{
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trace := &Trace{
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Action: Action{
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CallType: callType,
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From: et.Msg.From.String(),
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@ -221,6 +310,8 @@ func buildTraces(traces *[]*Trace, addr []int, et types.ExecutionTrace) {
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Gas: ethtypes.EthUint64(et.Msg.GasLimit),
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Input: hex.EncodeToString(et.Msg.Params),
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Value: ethtypes.EthBigInt(et.Msg.Value),
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Method: et.Msg.Method,
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CodeCid: et.Msg.CodeCid,
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},
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Result: Result{
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GasUsed: ethtypes.EthUint64(et.SumGas().TotalGas),
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@ -229,10 +320,69 @@ func buildTraces(traces *[]*Trace, addr []int, et types.ExecutionTrace) {
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Subtraces: len(et.Subcalls),
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TraceAddress: addr,
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Type: callType,
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})
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}
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// Native calls
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//
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// When an EVM actor is invoked with a method number above 1023 that's not frc42(InvokeEVM)
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// then we need to format native calls in a way that makes sense to Ethereum tooling (convert
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// the input & output to solidity ABI format).
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if parentEt != nil {
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if builtinactors.IsEvmActor(parentEt.Msg.CodeCid) && et.Msg.Method > 1023 && et.Msg.Method != builtin2.MethodsEVM.InvokeContract {
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log.Infof("found Native call! method:%d, code:%s, height:%d", et.Msg.Method, et.Msg.CodeCid.String(), height)
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input, _ := handle_filecoin_method_input(et.Msg.Method, et.Msg.ParamsCodec, et.Msg.Params)
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trace.Action.Input = hex.EncodeToString(input)
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output, _ := handle_filecoin_method_output(et.MsgRct.ExitCode, et.MsgRct.ReturnCodec, et.MsgRct.Return)
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trace.Result.Output = hex.EncodeToString(output)
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}
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}
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// Native actor creation
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//
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// TODO...
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// EVM contract creation
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//
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// TODO...
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// EVM call special casing
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//
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// Any outbound call from an EVM actor on methods 1-1023 are side-effects from EVM instructions
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// and should be dropped from the trace.
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if parentEt != nil {
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if builtinactors.IsEvmActor(parentEt.Msg.CodeCid) && et.Msg.Method > 0 && et.Msg.Method <= 1023 {
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log.Infof("found outbound call from an EVM actor on method 1-1023 method:%d, code:%s, height:%d", et.Msg.Method, et.Msg.CodeCid.String(), height)
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// skip current trace but process subcalls
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for i, call := range et.Subcalls {
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buildTraces(traces, append(addr, i), call, &et, height)
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}
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return
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}
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}
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// EVM -> EVM calls
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//
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// Check for normal EVM to EVM calls and decode the params and return values
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if parentEt != nil {
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if builtinactors.IsEvmActor(parentEt.Msg.CodeCid) && builtinactors.IsEthAccountActor(et.Msg.CodeCid) && et.Msg.Method == builtin2.MethodsEVM.InvokeContract {
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log.Infof("evm to evm! ! ")
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input, _ := handle_filecoin_method_input(et.Msg.Method, et.Msg.ParamsCodec, et.Msg.Params)
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trace.Action.Input = hex.EncodeToString(input)
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output, _ := handle_filecoin_method_output(et.MsgRct.ExitCode, et.MsgRct.ReturnCodec, et.MsgRct.Return)
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trace.Result.Output = hex.EncodeToString(output)
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}
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}
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if et.Msg.From == et.Msg.To && et.Msg.Method == builtin2.MethodsEVM.InvokeContractDelegate {
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log.Info("from and to are the same, and method is InvokeContractDelegate!!!!!!!!, height:%d", height)
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}
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*traces = append(*traces, trace)
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for i, call := range et.Subcalls {
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buildTraces(traces, append(addr, i), call)
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buildTraces(traces, append(addr, i), call, &et, height)
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}
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}
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