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besubatcher.go
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besubatcher.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 (
"fmt"
"io"
"os/exec"
"sync"
"time"
)
// BesuBatchVM is s Evm-interface wrapper around the `evmtool` binary, based on Besu.
// The BatchVM spins up one 'master' instance of the VM, and uses that to execute tests
type BesuBatchVM struct {
BesuVM
cmd *exec.Cmd // the 'master' process
stdout io.ReadCloser
stdin io.WriteCloser
mu sync.Mutex
}
func NewBesuBatchVM(path, name string) *BesuBatchVM {
return &BesuBatchVM{
BesuVM: BesuVM{
path: path,
name: name,
stats: new(VmStat),
},
}
}
func (evm *BesuBatchVM) Instance(threadId int) Evm {
return &BesuBatchVM{
BesuVM: BesuVM{
path: evm.path,
name: fmt.Sprintf("%v-%d", evm.name, threadId),
stats: evm.stats,
},
}
}
// RunStateTest implements the Evm interface
func (evm *BesuBatchVM) RunStateTest(path string, out io.Writer, speedTest bool) (*tracingResult, error) {
var (
t0 = time.Now()
err error
cmd *exec.Cmd
stdout io.ReadCloser
stdin io.WriteCloser
)
if evm.cmd == nil {
if speedTest {
cmd = exec.Command(evm.path, "--nomemory", "--notime", "state-test")
} else {
cmd = exec.Command(evm.path, "--nomemory", "--notime", "--json", "state-test")
}
if stdout, err = cmd.StdoutPipe(); err != nil {
return &tracingResult{Cmd: cmd.String()}, err
}
if stdin, err = cmd.StdinPipe(); err != nil {
return &tracingResult{Cmd: cmd.String()}, err
}
if err = cmd.Start(); err != nil {
return &tracingResult{Cmd: cmd.String()}, err
}
evm.cmd = cmd
evm.stdout = stdout
evm.stdin = stdin
}
evm.mu.Lock()
defer evm.mu.Unlock()
_, _ = evm.stdin.Write([]byte(fmt.Sprintf("%v\n", path)))
// copy everything for the _current_ statetest to the given writer
evm.copyUntilEnd(out, evm.stdout)
duration, slow := evm.stats.TraceDone(t0)
return &tracingResult{
Slow: slow,
ExecTime: duration,
Cmd: evm.cmd.String(),
}, nil
}
func (vm *BesuBatchVM) Close() {
if vm.stdin != nil {
vm.stdin.Close()
}
if vm.cmd != nil {
_ = vm.cmd.Wait()
}
}
func (evm *BesuBatchVM) GetStateRoot(path string) (root, command string, err error) {
if evm.cmd == nil {
evm.cmd = exec.Command(evm.path, "--nomemory", "--notime", "state-test")
// The stateroot is delivered on stdout
if evm.stdout, err = evm.cmd.StdoutPipe(); err != nil {
return "", evm.cmd.String(), err
}
if evm.stdin, err = evm.cmd.StdinPipe(); err != nil {
return "", evm.cmd.String(), err
}
if err = evm.cmd.Start(); err != nil {
return "", evm.cmd.String(), err
}
}
evm.mu.Lock()
defer evm.mu.Unlock()
_, _ = evm.stdin.Write([]byte(fmt.Sprintf("%v\n", path)))
sRoot := evm.copyUntilEnd(io.Discard, evm.stdout)
return sRoot.StateRoot, evm.cmd.String(), nil
}