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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/>.
//+build go1.5
package debug
import (
"errors"
"os"
"runtime/trace"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
)
// StartTrace turns on tracing, writing to the given file.
func (h *HandlerT) StartTrace(file string) error {
h.mu.Lock()
defer h.mu.Unlock()
if h.traceW != nil {
return errors.New("trace already in progress")
}
f, err := os.Create(expandHome(file))
if err != nil {
return err
}
if err := trace.Start(f); err != nil {
f.Close()
return err
}
h.traceW = f
h.traceFile = file
glog.V(logger.Info).Infoln("trace started, writing to", h.traceFile)
return nil
}
// StopTrace stops an ongoing trace.
func (h *HandlerT) StopTrace() error {
h.mu.Lock()
defer h.mu.Unlock()
trace.Stop()
if h.traceW == nil {
return errors.New("trace not in progress")
}
glog.V(logger.Info).Infoln("done writing trace to", h.traceFile)
h.traceW.Close()
h.traceW = nil
h.traceFile = ""
return nil
}
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