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trace.go
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trace.go
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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum 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.
//
// The go-ethereum 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
//go:build go1.5
// +build go1.5
package debug
import (
"errors"
"os"
"runtime/trace"
stderrors "github.com/pkg/errors"
)
// StartGoTrace turns on tracing, writing to the given file.
func (a *API) StartGoTrace(file string) error {
a.logger.Debug("debug_startGoTrace", "file", file)
a.handler.mu.Lock()
defer a.handler.mu.Unlock()
if a.handler.traceFile != nil {
a.logger.Debug("trace already in progress")
return errors.New("trace already in progress")
}
fp, err := ExpandHome(file)
if err != nil {
a.logger.Debug("failed to get filepath for the CPU profile file", "error", err.Error())
return err
}
f, err := os.Create(fp)
if err != nil {
a.logger.Debug("failed to create go trace file", "error", err.Error())
return err
}
if err := trace.Start(f); err != nil {
a.logger.Debug("Go tracing already started", "error", err.Error())
if err := f.Close(); err != nil {
a.logger.Debug("failed to close trace file")
return stderrors.Wrap(err, "failed to close trace file")
}
return err
}
a.handler.traceFile = f
a.handler.traceFilename = file
a.logger.Info("Go tracing started", "dump", a.handler.traceFilename)
return nil
}
// StopGoTrace stops an ongoing trace.
func (a *API) StopGoTrace() error {
a.logger.Debug("debug_stopGoTrace")
a.handler.mu.Lock()
defer a.handler.mu.Unlock()
trace.Stop()
if a.handler.traceFile == nil {
a.logger.Debug("trace not in progress")
return errors.New("trace not in progress")
}
a.logger.Info("Done writing Go trace", "dump", a.handler.traceFilename)
if err := a.handler.traceFile.Close(); err != nil {
a.logger.Debug("failed to close trace file")
return stderrors.Wrap(err, "failed to close trace file")
}
a.handler.traceFile = nil
a.handler.traceFilename = ""
return nil
}