236 lines
6.7 KiB
Go
236 lines
6.7 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package debug interfaces Go runtime debugging facilities.
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// This package is mostly glue code making these facilities available
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// through the CLI and RPC subsystem. If you want to use them from Go code,
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// use package runtime instead.
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package debug
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import (
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"errors"
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"io"
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"os"
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"os/user"
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"path/filepath"
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"runtime"
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"runtime/debug"
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"runtime/pprof"
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"strings"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/log"
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)
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// Handler is the global debugging handler.
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var Handler = new(HandlerT)
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// HandlerT implements the debugging API.
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// Do not create values of this type, use the one
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// in the Handler variable instead.
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type HandlerT struct {
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mu sync.Mutex
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cpuW io.WriteCloser
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cpuFile string
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traceW io.WriteCloser
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traceFile string
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}
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// Verbosity sets the log verbosity ceiling. The verbosity of individual packages
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// and source files can be raised using Vmodule.
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func (*HandlerT) Verbosity(level int) {
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glogger.Verbosity(log.Lvl(level))
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}
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// Vmodule sets the log verbosity pattern. See package log for details on the
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// pattern syntax.
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func (*HandlerT) Vmodule(pattern string) error {
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return glogger.Vmodule(pattern)
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}
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// BacktraceAt sets the log backtrace location. See package log for details on
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// the pattern syntax.
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func (*HandlerT) BacktraceAt(location string) error {
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return glogger.BacktraceAt(location)
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}
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// MemStats returns detailed runtime memory statistics.
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func (*HandlerT) MemStats() *runtime.MemStats {
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s := new(runtime.MemStats)
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runtime.ReadMemStats(s)
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return s
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}
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// GcStats returns GC statistics.
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func (*HandlerT) GcStats() *debug.GCStats {
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s := new(debug.GCStats)
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debug.ReadGCStats(s)
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return s
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}
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// CpuProfile turns on CPU profiling for nsec seconds and writes
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// profile data to file.
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func (h *HandlerT) CpuProfile(file string, nsec uint) error {
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if err := h.StartCPUProfile(file); err != nil {
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return err
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}
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time.Sleep(time.Duration(nsec) * time.Second)
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h.StopCPUProfile()
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return nil
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}
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// StartCPUProfile turns on CPU profiling, writing to the given file.
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func (h *HandlerT) StartCPUProfile(file string) error {
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h.mu.Lock()
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defer h.mu.Unlock()
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if h.cpuW != nil {
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return errors.New("CPU profiling already in progress")
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}
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f, err := os.Create(expandHome(file))
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if err != nil {
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return err
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}
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if err := pprof.StartCPUProfile(f); err != nil {
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f.Close()
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return err
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}
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h.cpuW = f
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h.cpuFile = file
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log.Info("CPU profiling started", "dump", h.cpuFile)
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return nil
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}
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// StopCPUProfile stops an ongoing CPU profile.
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func (h *HandlerT) StopCPUProfile() error {
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h.mu.Lock()
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defer h.mu.Unlock()
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pprof.StopCPUProfile()
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if h.cpuW == nil {
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return errors.New("CPU profiling not in progress")
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}
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log.Info("Done writing CPU profile", "dump", h.cpuFile)
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h.cpuW.Close()
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h.cpuW = nil
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h.cpuFile = ""
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return nil
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}
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// GoTrace turns on tracing for nsec seconds and writes
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// trace data to file.
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func (h *HandlerT) GoTrace(file string, nsec uint) error {
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if err := h.StartGoTrace(file); err != nil {
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return err
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}
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time.Sleep(time.Duration(nsec) * time.Second)
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h.StopGoTrace()
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return nil
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}
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// BlockProfile turns on goroutine profiling for nsec seconds and writes profile data to
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// file. It uses a profile rate of 1 for most accurate information. If a different rate is
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// desired, set the rate and write the profile manually.
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func (*HandlerT) BlockProfile(file string, nsec uint) error {
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runtime.SetBlockProfileRate(1)
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time.Sleep(time.Duration(nsec) * time.Second)
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defer runtime.SetBlockProfileRate(0)
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return writeProfile("block", file)
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}
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// SetBlockProfileRate sets the rate of goroutine block profile data collection.
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// rate 0 disables block profiling.
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func (*HandlerT) SetBlockProfileRate(rate int) {
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runtime.SetBlockProfileRate(rate)
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}
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// WriteBlockProfile writes a goroutine blocking profile to the given file.
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func (*HandlerT) WriteBlockProfile(file string) error {
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return writeProfile("block", file)
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}
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// MutexProfile turns on mutex profiling for nsec seconds and writes profile data to file.
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// It uses a profile rate of 1 for most accurate information. If a different rate is
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// desired, set the rate and write the profile manually.
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func (*HandlerT) MutexProfile(file string, nsec uint) error {
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runtime.SetMutexProfileFraction(1)
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time.Sleep(time.Duration(nsec) * time.Second)
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defer runtime.SetMutexProfileFraction(0)
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return writeProfile("mutex", file)
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}
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// SetMutexProfileFraction sets the rate of mutex profiling.
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func (*HandlerT) SetMutexProfileFraction(rate int) {
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runtime.SetMutexProfileFraction(rate)
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}
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// WriteMutexProfile writes a goroutine blocking profile to the given file.
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func (*HandlerT) WriteMutexProfile(file string) error {
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return writeProfile("mutex", file)
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}
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// WriteMemProfile writes an allocation profile to the given file.
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// Note that the profiling rate cannot be set through the API,
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// it must be set on the command line.
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func (*HandlerT) WriteMemProfile(file string) error {
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return writeProfile("heap", file)
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}
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// Stacks returns a printed representation of the stacks of all goroutines.
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func (*HandlerT) Stacks() string {
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buf := make([]byte, 1024*1024)
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buf = buf[:runtime.Stack(buf, true)]
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return string(buf)
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}
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// FreeOSMemory returns unused memory to the OS.
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func (*HandlerT) FreeOSMemory() {
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debug.FreeOSMemory()
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}
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// SetGCPercent sets the garbage collection target percentage. It returns the previous
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// setting. A negative value disables GC.
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func (*HandlerT) SetGCPercent(v int) int {
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return debug.SetGCPercent(v)
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}
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func writeProfile(name, file string) error {
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p := pprof.Lookup(name)
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log.Info("Writing profile records", "count", p.Count(), "type", name, "dump", file)
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f, err := os.Create(expandHome(file))
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if err != nil {
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return err
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}
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defer f.Close()
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return p.WriteTo(f, 0)
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}
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// expands home directory in file paths.
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// ~someuser/tmp will not be expanded.
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func expandHome(p string) string {
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if strings.HasPrefix(p, "~/") || strings.HasPrefix(p, "~\\") {
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home := os.Getenv("HOME")
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if home == "" {
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if usr, err := user.Current(); err == nil {
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home = usr.HomeDir
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}
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}
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if home != "" {
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p = home + p[1:]
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}
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}
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return filepath.Clean(p)
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}
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