forked from holiman/goevmlab
/
geth.go
148 lines (136 loc) · 4.37 KB
/
geth.go
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// Copyright 2019 Martin Holst Swende
// This file is part of the goevmlab library.
//
// The library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the goevmlab library. If not, see <http://www.gnu.org/licenses/>.
package evms
import (
"bufio"
json "github.com/json-iterator/go"
"errors"
"fmt"
"io"
"os"
"os/exec"
"strings"
"github.com/ethereum/go-ethereum/core/vm"
)
// GethEVM is s Evm-interface wrapper around the `evm` binary, based on go-ethereum.
type GethEVM struct {
path string
}
func NewGethEVM(path string) *GethEVM {
return &GethEVM{
path: path,
}
}
// GetStateRoot runs the test and returns the stateroot
// This currently only works for non-filled statetests. TODO: make it work even if the
// test is filled. Either by getting the whole trace, or adding stateroot to exec std output
// even in success-case
func (evm *GethEVM) GetStateRoot(path string) (string, error) {
// In this mode, we can run it without tracing
cmd := exec.Command(evm.path, "statetest", path)
data, err := cmd.CombinedOutput()
if err != nil {
return "", err
}
start := strings.Index(string(data), "mismatch: got ")
end := strings.Index(string(data), ", want")
if start > 0 && end > 0 {
root := fmt.Sprintf("0x%v", string(data[start+len("mismatch: got "):end]))
return root, nil
}
return "", errors.New("no stateroot found")
}
// RunStateTest implements the Evm interface
func (evm *GethEVM) RunStateTest(path string, out io.Writer, speedTest bool) (string, error) {
var (
stderr io.ReadCloser
err error
cmd *exec.Cmd
)
if speedTest {
cmd = exec.Command(evm.path, "--nomemory", "--noreturndata", "--nostack", "statetest", path)
} else {
cmd = exec.Command(evm.path, "--json", "--noreturndata", "--nomemory", "statetest", path)
}
if stderr, err = cmd.StderrPipe(); err != nil {
return cmd.String(), err
}
if err = cmd.Start(); err != nil {
return cmd.String(), err
}
// copy everything to the given writer
evm.Copy(out, stderr)
// release resources
return cmd.String(), cmd.Wait()
}
func (evm *GethEVM) Name() string {
return "geth"
}
func (vm *GethEVM) Close() {
}
// feed reads from the reader, does some geth-specific filtering and
// outputs items onto the channel
func (evm *GethEVM) Copy(out io.Writer, input io.Reader) {
var stateRoot stateRoot
scanner := bufio.NewScanner(input)
buf := make([]byte, 4*1024*1024)
scanner.Buffer(buf, cap(buf))
for scanner.Scan() {
data := scanner.Bytes()
//fmt.Printf("geth: %v\n", string(data))
var elem vm.StructLog
err := json.Unmarshal(data, &elem)
if err != nil {
fmt.Printf("geth err: %v, line\n\t%v\n", err, string(data))
continue
}
// If the output cannot be marshalled, all fields will be blanks.
// We can detect that through 'depth', which should never be less than 1
// for any actual opcode
if elem.Depth == 0 {
if stateRoot.StateRoot == "" {
if err := json.Unmarshal(data, &stateRoot); err == nil {
// geth doesn't 0x-prefix stateroot
if r := stateRoot.StateRoot; len(r) > 0 {
stateRoot.StateRoot = fmt.Sprintf("0x%v", r)
}
}
}
/* Most likely one of these:
{"output":"","gasUsed":"0x2d1cc4","time":233624,"error":"gas uint64 overflow"}
{"stateRoot": "a2b3391f7a85bf1ad08dc541a1b99da3c591c156351391f26ec88c557ff12134"}
*/
// For now, just ignore these
continue
}
// When geth encounters end of code, it continues anyway, on a 'virtual' STOP.
// In order to handle that, we need to drop all STOP opcodes.
if elem.Op == 0x0 {
continue
}
RemoveUnsupportedElems(&elem)
jsondata, _ := json.Marshal(elem)
if _, err := out.Write(append(jsondata, '\n')); err != nil {
fmt.Fprintf(os.Stderr, "Error writing to out: %v\n", err)
return
}
}
root, _ := json.Marshal(stateRoot)
if _, err := out.Write(append(root, '\n')); err != nil {
fmt.Fprintf(os.Stderr, "Error writing to out: %v\n", err)
return
}
}