// 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/log" ) // StartGoTrace turns on tracing, writing to the given file. func (h *HandlerT) StartGoTrace(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 log.Info("Go tracing started", "dump", h.traceFile) return nil } // StopTrace stops an ongoing trace. func (h *HandlerT) StopGoTrace() error { h.mu.Lock() defer h.mu.Unlock() trace.Stop() if h.traceW == nil { return errors.New("trace not in progress") } log.Info("Done writing Go trace", "dump", h.traceFile) h.traceW.Close() h.traceW = nil h.traceFile = "" return nil }