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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"
"runtime"
"github.com/codegangsta/cli"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
)
var (
verbosityFlag = cli.GenericFlag{
Name: "verbosity",
Usage: "Logging verbosity: 0=silent, 1=error, 2=warn, 3=info, 4=core, 5=debug, 6=detail",
Value: glog.GetVerbosity(),
}
vmoduleFlag = cli.GenericFlag{
Name: "vmodule",
Usage: "Per-module verbosity: comma-separated list of <pattern>=<level> (e.g. eth/*=6,p2p=5)",
Value: glog.GetVModule(),
}
backtraceAtFlag = cli.GenericFlag{
Name: "backtrace",
Usage: "Request a stack trace at a specific logging statement (e.g. \"block.go:271\")",
Value: glog.GetTraceLocation(),
}
pprofFlag = cli.BoolFlag{
Name: "pprof",
Usage: "Enable the pprof HTTP server",
}
pprofPortFlag = cli.IntFlag{
Name: "pprofport",
Usage: "pprof HTTP server listening port",
Value: 6060,
}
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{
verbosityFlag, vmoduleFlag, backtraceAtFlag,
pprofFlag, pprofPortFlag,
memprofilerateFlag, blockprofilerateFlag, cpuprofileFlag, traceFlag,
}
// 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 {
// logging
glog.CopyStandardLogTo("INFO")
glog.SetToStderr(true)
// profiling, tracing
runtime.MemProfileRate = ctx.GlobalInt(memprofilerateFlag.Name)
Handler.SetBlockProfileRate(ctx.GlobalInt(blockprofilerateFlag.Name))
if traceFile := ctx.GlobalString(traceFlag.Name); traceFile != "" {
if err := Handler.StartTrace(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("127.0.0.1:%d", ctx.GlobalInt(pprofPortFlag.Name))
go func() {
glog.V(logger.Info).Infof("starting pprof server at http://%s/debug/pprof", address)
glog.Errorln(http.ListenAndServe(address, nil))
}()
}
return nil
}
// Exit stops all running profiles, flushing their output to the
// respective file.
func Exit() {
Handler.StopCPUProfile()
Handler.StopTrace()
}
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