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flags.go
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flags.go
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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/>.
package debug
import (
"fmt"
"net/http"
_ "net/http/pprof"
"os"
"runtime"
"bitbucket.org/cpchain/chain/commons/log"
"github.com/ethereum/go-ethereum/metrics"
"github.com/ethereum/go-ethereum/metrics/exp"
"github.com/fjl/memsize/memsizeui"
"github.com/urfave/cli"
)
var Memsize memsizeui.Handler
var (
pprofFlag = cli.BoolFlag{
Name: "pprof",
Usage: "Enable the pprof HTTP server",
}
pprofPortFlag = cli.IntFlag{
Name: "pprofport",
Usage: "pprof HTTP server listening port",
Value: 6060,
}
pprofAddrFlag = cli.StringFlag{
Name: "pprofaddr",
Usage: "pprof HTTP server listening interface",
Value: "127.0.0.1",
}
memprofilerateFlag = cli.IntFlag{
Name: "memprofilerate",
Usage: "Turn on memory profiling with the given rate",
Value: runtime.MemProfileRate,
}
blockprofilerateFlag = cli.IntFlag{
Name: "blockprofilerate",
Usage: "Turn on block profiling with the given rate",
}
cpuprofileFlag = cli.StringFlag{
Name: "cpuprofile",
Usage: "Write CPU profile to the given file",
}
traceFlag = cli.StringFlag{
Name: "trace",
Usage: "Write execution trace to the given file",
}
)
// Flags holds all command-line flags required for debugging.
var Flags = []cli.Flag{
pprofFlag, pprofAddrFlag, pprofPortFlag,
memprofilerateFlag, blockprofilerateFlag, cpuprofileFlag, traceFlag,
}
func init() {
log.SetLevel(log.InfoLevel)
log.SetOutput(os.Stderr)
}
// 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 {
// profiling, tracing
runtime.MemProfileRate = ctx.GlobalInt(memprofilerateFlag.Name)
Handler.SetBlockProfileRate(ctx.GlobalInt(blockprofilerateFlag.Name))
if traceFile := ctx.GlobalString(traceFlag.Name); traceFile != "" {
if err := Handler.StartGoTrace(traceFile); err != nil {
return err
}
}
if cpuFile := ctx.GlobalString(cpuprofileFlag.Name); cpuFile != "" {
if err := Handler.StartCPUProfile(cpuFile); err != nil {
return err
}
}
// pprof server
if ctx.GlobalBool(pprofFlag.Name) {
address := fmt.Sprintf("%s:%d", ctx.GlobalString(pprofAddrFlag.Name), ctx.GlobalInt(pprofPortFlag.Name))
StartPProf(address)
}
return nil
}
func StartPProf(address string) {
// Hook go-metrics into expvar on any /debug/metrics request, load all vars
// from the registry into expvar, and execute regular expvar handler.
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()
}