github.com/sberex/go-sberex@v1.8.2-0.20181113200658-ed96ac38f7d7/internal/debug/trace.go (about) 1 // This file is part of the go-sberex library. The go-sberex library is 2 // free software: you can redistribute it and/or modify it under the terms 3 // of the GNU Lesser General Public License as published by the Free 4 // Software Foundation, either version 3 of the License, or (at your option) 5 // any later version. 6 // 7 // The go-sberex library is distributed in the hope that it will be useful, 8 // but WITHOUT ANY WARRANTY; without even the implied warranty of 9 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser 10 // General Public License <http://www.gnu.org/licenses/> for more details. 11 12 //+build go1.5 13 14 package debug 15 16 import ( 17 "errors" 18 "os" 19 "runtime/trace" 20 21 "github.com/Sberex/go-sberex/log" 22 ) 23 24 // StartGoTrace turns on tracing, writing to the given file. 25 func (h *HandlerT) StartGoTrace(file string) error { 26 h.mu.Lock() 27 defer h.mu.Unlock() 28 if h.traceW != nil { 29 return errors.New("trace already in progress") 30 } 31 f, err := os.Create(expandHome(file)) 32 if err != nil { 33 return err 34 } 35 if err := trace.Start(f); err != nil { 36 f.Close() 37 return err 38 } 39 h.traceW = f 40 h.traceFile = file 41 log.Info("Go tracing started", "dump", h.traceFile) 42 return nil 43 } 44 45 // StopTrace stops an ongoing trace. 46 func (h *HandlerT) StopGoTrace() error { 47 h.mu.Lock() 48 defer h.mu.Unlock() 49 trace.Stop() 50 if h.traceW == nil { 51 return errors.New("trace not in progress") 52 } 53 log.Info("Done writing Go trace", "dump", h.traceFile) 54 h.traceW.Close() 55 h.traceW = nil 56 h.traceFile = "" 57 return nil 58 }