Official Go implementation of the Ethereum protocol
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go-ethereum/internal/debug/flags.go

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10 KiB

// 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/>.
package debug
import (
"fmt"
"io"
"net"
"net/http"
_ "net/http/pprof"
"os"
"path/filepath"
"runtime"
"github.com/ethereum/go-ethereum/internal/flags"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/metrics"
"github.com/ethereum/go-ethereum/metrics/exp"
"github.com/fjl/memsize/memsizeui"
"github.com/mattn/go-colorable"
"github.com/mattn/go-isatty"
"github.com/urfave/cli/v2"
"gopkg.in/natefinch/lumberjack.v2"
)
var Memsize memsizeui.Handler
var (
verbosityFlag = &cli.IntFlag{
Name: "verbosity",
Usage: "Logging verbosity: 0=silent, 1=error, 2=warn, 3=info, 4=debug, 5=detail",
Value: 3,
Category: flags.LoggingCategory,
}
logVmoduleFlag = &cli.StringFlag{
Name: "log.vmodule",
Usage: "Per-module verbosity: comma-separated list of <pattern>=<level> (e.g. eth/*=5,p2p=4)",
Value: "",
Category: flags.LoggingCategory,
}
vmoduleFlag = &cli.StringFlag{
Name: "vmodule",
Usage: "Per-module verbosity: comma-separated list of <pattern>=<level> (e.g. eth/*=5,p2p=4)",
Value: "",
Hidden: true,
Category: flags.LoggingCategory,
}
logjsonFlag = &cli.BoolFlag{
Name: "log.json",
Usage: "Format logs with JSON",
Hidden: true,
Category: flags.LoggingCategory,
}
logFormatFlag = &cli.StringFlag{
Name: "log.format",
Usage: "Log format to use (json|logfmt|terminal)",
Category: flags.LoggingCategory,
}
logFileFlag = &cli.StringFlag{
Name: "log.file",
Usage: "Write logs to a file",
Category: flags.LoggingCategory,
}
backtraceAtFlag = &cli.StringFlag{
Name: "log.backtrace",
Usage: "Request a stack trace at a specific logging statement (e.g. \"block.go:271\")",
Value: "",
Category: flags.LoggingCategory,
}
debugFlag = &cli.BoolFlag{
Name: "log.debug",
Usage: "Prepends log messages with call-site location (file and line number)",
Category: flags.LoggingCategory,
}
logRotateFlag = &cli.BoolFlag{
Name: "log.rotate",
Usage: "Enables log file rotation",
Category: flags.LoggingCategory,
}
logMaxSizeMBsFlag = &cli.IntFlag{
Name: "log.maxsize",
Usage: "Maximum size in MBs of a single log file",
Value: 100,
Category: flags.LoggingCategory,
}
logMaxBackupsFlag = &cli.IntFlag{
Name: "log.maxbackups",
Usage: "Maximum number of log files to retain",
Value: 10,
Category: flags.LoggingCategory,
}
logMaxAgeFlag = &cli.IntFlag{
Name: "log.maxage",
Usage: "Maximum number of days to retain a log file",
Value: 30,
Category: flags.LoggingCategory,
}
logCompressFlag = &cli.BoolFlag{
Name: "log.compress",
Usage: "Compress the log files",
Value: false,
Category: flags.LoggingCategory,
}
pprofFlag = &cli.BoolFlag{
Name: "pprof",
Usage: "Enable the pprof HTTP server",
Category: flags.LoggingCategory,
}
pprofPortFlag = &cli.IntFlag{
Name: "pprof.port",
Usage: "pprof HTTP server listening port",
Value: 6060,
Category: flags.LoggingCategory,
}
pprofAddrFlag = &cli.StringFlag{
Name: "pprof.addr",
Usage: "pprof HTTP server listening interface",
Value: "127.0.0.1",
Category: flags.LoggingCategory,
}
memprofilerateFlag = &cli.IntFlag{
Name: "pprof.memprofilerate",
Usage: "Turn on memory profiling with the given rate",
Value: runtime.MemProfileRate,
Category: flags.LoggingCategory,
}
blockprofilerateFlag = &cli.IntFlag{
Name: "pprof.blockprofilerate",
Usage: "Turn on block profiling with the given rate",
Category: flags.LoggingCategory,
}
cpuprofileFlag = &cli.StringFlag{
Name: "pprof.cpuprofile",
Usage: "Write CPU profile to the given file",
Category: flags.LoggingCategory,
}
traceFlag = &cli.StringFlag{
Name: "trace",
Usage: "Write execution trace to the given file",
Category: flags.LoggingCategory,
}
)
// Flags holds all command-line flags required for debugging.
var Flags = []cli.Flag{
verbosityFlag,
logVmoduleFlag,
vmoduleFlag,
backtraceAtFlag,
debugFlag,
logjsonFlag,
logFormatFlag,
logFileFlag,
logRotateFlag,
logMaxSizeMBsFlag,
logMaxBackupsFlag,
logMaxAgeFlag,
logCompressFlag,
pprofFlag,
pprofAddrFlag,
pprofPortFlag,
memprofilerateFlag,
blockprofilerateFlag,
cpuprofileFlag,
traceFlag,
}
var (
glogger *log.GlogHandler
logOutputStream log.Handler
)
func init() {
glogger = log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
glogger.Verbosity(log.LvlInfo)
log.Root().SetHandler(glogger)
}
// Setup initializes profiling and logging based on the CLI flags.
// It should be called as early as possible in the program.
func Setup(ctx *cli.Context) error {
var (
logfmt log.Format
output = io.Writer(os.Stderr)
logFmtFlag = ctx.String(logFormatFlag.Name)
)
switch {
case ctx.Bool(logjsonFlag.Name):
// Retain backwards compatibility with `--log.json` flag if `--log.format` not set
defer log.Warn("The flag '--log.json' is deprecated, please use '--log.format=json' instead")
logfmt = log.JSONFormat()
case logFmtFlag == "json":
logfmt = log.JSONFormat()
case logFmtFlag == "logfmt":
logfmt = log.LogfmtFormat()
case logFmtFlag == "", logFmtFlag == "terminal":
useColor := (isatty.IsTerminal(os.Stderr.Fd()) || isatty.IsCygwinTerminal(os.Stderr.Fd())) && os.Getenv("TERM") != "dumb"
if useColor {
output = colorable.NewColorableStderr()
}
logfmt = log.TerminalFormat(useColor)
default:
// Unknown log format specified
return fmt.Errorf("unknown log format: %v", ctx.String(logFormatFlag.Name))
}
var (
stdHandler = log.StreamHandler(output, logfmt)
ostream = stdHandler
logFile = ctx.String(logFileFlag.Name)
rotation = ctx.Bool(logRotateFlag.Name)
)
if len(logFile) > 0 {
if err := validateLogLocation(filepath.Dir(logFile)); err != nil {
return fmt.Errorf("failed to initiatilize file logger: %v", err)
}
}
context := []interface{}{"rotate", rotation}
if len(logFmtFlag) > 0 {
context = append(context, "format", logFmtFlag)
} else {
context = append(context, "format", "terminal")
}
if rotation {
// Lumberjack uses <processname>-lumberjack.log in is.TempDir() if empty.
// so typically /tmp/geth-lumberjack.log on linux
if len(logFile) > 0 {
context = append(context, "location", logFile)
} else {
context = append(context, "location", filepath.Join(os.TempDir(), "geth-lumberjack.log"))
}
ostream = log.MultiHandler(log.StreamHandler(&lumberjack.Logger{
Filename: logFile,
MaxSize: ctx.Int(logMaxSizeMBsFlag.Name),
MaxBackups: ctx.Int(logMaxBackupsFlag.Name),
MaxAge: ctx.Int(logMaxAgeFlag.Name),
Compress: ctx.Bool(logCompressFlag.Name),
}, logfmt), stdHandler)
} else if logFile != "" {
if logOutputStream, err := log.FileHandler(logFile, logfmt); err != nil {
return err
} else {
ostream = log.MultiHandler(logOutputStream, stdHandler)
context = append(context, "location", logFile)
}
}
glogger.SetHandler(ostream)
// logging
verbosity := ctx.Int(verbosityFlag.Name)
glogger.Verbosity(log.Lvl(verbosity))
vmodule := ctx.String(logVmoduleFlag.Name)
if vmodule == "" {
// Retain backwards compatibility with `--vmodule` flag if `--log.vmodule` not set
vmodule = ctx.String(vmoduleFlag.Name)
if vmodule != "" {
defer log.Warn("The flag '--vmodule' is deprecated, please use '--log.vmodule' instead")
}
}
glogger.Vmodule(vmodule)
debug := ctx.Bool(debugFlag.Name)
if ctx.IsSet(debugFlag.Name) {
debug = ctx.Bool(debugFlag.Name)
}
log.PrintOrigins(debug)
backtrace := ctx.String(backtraceAtFlag.Name)
glogger.BacktraceAt(backtrace)
log.Root().SetHandler(glogger)
// profiling, tracing
runtime.MemProfileRate = memprofilerateFlag.Value
if ctx.IsSet(memprofilerateFlag.Name) {
runtime.MemProfileRate = ctx.Int(memprofilerateFlag.Name)
}
blockProfileRate := ctx.Int(blockprofilerateFlag.Name)
Handler.SetBlockProfileRate(blockProfileRate)
if traceFile := ctx.String(traceFlag.Name); traceFile != "" {
if err := Handler.StartGoTrace(traceFile); err != nil {
return err
}
}
if cpuFile := ctx.String(cpuprofileFlag.Name); cpuFile != "" {
if err := Handler.StartCPUProfile(cpuFile); err != nil {
return err
}
}
// pprof server
if ctx.Bool(pprofFlag.Name) {
listenHost := ctx.String(pprofAddrFlag.Name)
port := ctx.Int(pprofPortFlag.Name)
address := net.JoinHostPort(listenHost, fmt.Sprintf("%d", port))
// This context value ("metrics.addr") represents the utils.MetricsHTTPFlag.Name.
// It cannot be imported because it will cause a cyclical dependency.
StartPProf(address, !ctx.IsSet("metrics.addr"))
}
if len(logFile) > 0 || rotation {
log.Info("Logging configured", context...)
}
return nil
}
func StartPProf(address string, withMetrics bool) {
// Hook go-metrics into expvar on any /debug/metrics request, load all vars
// from the registry into expvar, and execute regular expvar handler.
if withMetrics {
exp.Exp(metrics.DefaultRegistry)
}
http.Handle("/memsize/", http.StripPrefix("/memsize", &Memsize))
log.Info("Starting pprof server", "addr", fmt.Sprintf("http://%s/debug/pprof", address))
go func() {
if err := http.ListenAndServe(address, nil); err != nil {
log.Error("Failure in running pprof server", "err", err)
}
}()
}
// Exit stops all running profiles, flushing their output to the
// respective file.
func Exit() {
Handler.StopCPUProfile()
Handler.StopGoTrace()
if closer, ok := logOutputStream.(io.Closer); ok {
closer.Close()
}
}
func validateLogLocation(path string) error {
if err := os.MkdirAll(path, os.ModePerm); err != nil {
return fmt.Errorf("error creating the directory: %w", err)
}
// Check if the path is writable by trying to create a temporary file
tmp := filepath.Join(path, "tmp")
if f, err := os.Create(tmp); err != nil {
return err
} else {
f.Close()
}
return os.Remove(tmp)
}