github.com/Elemental-core/elementalcore@v0.0.0-20191206075037-63891242267a/internal/debug/flags.go (about)

     1  // Copyright 2016 The elementalcore Authors
     2  // This file is part of the elementalcore library.
     3  //
     4  // The elementalcore library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The elementalcore library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the elementalcore library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package debug
    18  
    19  import (
    20  	"fmt"
    21  	"io"
    22  	"net/http"
    23  	_ "net/http/pprof"
    24  	"os"
    25  	"runtime"
    26  
    27  	"github.com/Elemental-core/elementalcore/log"
    28  	"github.com/Elemental-core/elementalcore/log/term"
    29  	colorable "github.com/mattn/go-colorable"
    30  	"gopkg.in/urfave/cli.v1"
    31  )
    32  
    33  var (
    34  	verbosityFlag = cli.IntFlag{
    35  		Name:  "verbosity",
    36  		Usage: "Logging verbosity: 0=silent, 1=error, 2=warn, 3=info, 4=debug, 5=detail",
    37  		Value: 3,
    38  	}
    39  	vmoduleFlag = cli.StringFlag{
    40  		Name:  "vmodule",
    41  		Usage: "Per-module verbosity: comma-separated list of <pattern>=<level> (e.g. eth/*=5,p2p=4)",
    42  		Value: "",
    43  	}
    44  	backtraceAtFlag = cli.StringFlag{
    45  		Name:  "backtrace",
    46  		Usage: "Request a stack trace at a specific logging statement (e.g. \"block.go:271\")",
    47  		Value: "",
    48  	}
    49  	debugFlag = cli.BoolFlag{
    50  		Name:  "debug",
    51  		Usage: "Prepends log messages with call-site location (file and line number)",
    52  	}
    53  	pprofFlag = cli.BoolFlag{
    54  		Name:  "pprof",
    55  		Usage: "Enable the pprof HTTP server",
    56  	}
    57  	pprofPortFlag = cli.IntFlag{
    58  		Name:  "pprofport",
    59  		Usage: "pprof HTTP server listening port",
    60  		Value: 6060,
    61  	}
    62  	pprofAddrFlag = cli.StringFlag{
    63  		Name:  "pprofaddr",
    64  		Usage: "pprof HTTP server listening interface",
    65  		Value: "127.0.0.1",
    66  	}
    67  	memprofilerateFlag = cli.IntFlag{
    68  		Name:  "memprofilerate",
    69  		Usage: "Turn on memory profiling with the given rate",
    70  		Value: runtime.MemProfileRate,
    71  	}
    72  	blockprofilerateFlag = cli.IntFlag{
    73  		Name:  "blockprofilerate",
    74  		Usage: "Turn on block profiling with the given rate",
    75  	}
    76  	cpuprofileFlag = cli.StringFlag{
    77  		Name:  "cpuprofile",
    78  		Usage: "Write CPU profile to the given file",
    79  	}
    80  	traceFlag = cli.StringFlag{
    81  		Name:  "trace",
    82  		Usage: "Write execution trace to the given file",
    83  	}
    84  )
    85  
    86  // Flags holds all command-line flags required for debugging.
    87  var Flags = []cli.Flag{
    88  	verbosityFlag, vmoduleFlag, backtraceAtFlag, debugFlag,
    89  	pprofFlag, pprofAddrFlag, pprofPortFlag,
    90  	memprofilerateFlag, blockprofilerateFlag, cpuprofileFlag, traceFlag,
    91  }
    92  
    93  var glogger *log.GlogHandler
    94  
    95  func init() {
    96  	usecolor := term.IsTty(os.Stderr.Fd()) && os.Getenv("TERM") != "dumb"
    97  	output := io.Writer(os.Stderr)
    98  	if usecolor {
    99  		output = colorable.NewColorableStderr()
   100  	}
   101  	glogger = log.NewGlogHandler(log.StreamHandler(output, log.TerminalFormat(usecolor)))
   102  }
   103  
   104  // Setup initializes profiling and logging based on the CLI flags.
   105  // It should be called as early as possible in the program.
   106  func Setup(ctx *cli.Context) error {
   107  	// logging
   108  	log.PrintOrigins(ctx.GlobalBool(debugFlag.Name))
   109  	glogger.Verbosity(log.Lvl(ctx.GlobalInt(verbosityFlag.Name)))
   110  	glogger.Vmodule(ctx.GlobalString(vmoduleFlag.Name))
   111  	glogger.BacktraceAt(ctx.GlobalString(backtraceAtFlag.Name))
   112  	log.Root().SetHandler(glogger)
   113  
   114  	// profiling, tracing
   115  	runtime.MemProfileRate = ctx.GlobalInt(memprofilerateFlag.Name)
   116  	Handler.SetBlockProfileRate(ctx.GlobalInt(blockprofilerateFlag.Name))
   117  	if traceFile := ctx.GlobalString(traceFlag.Name); traceFile != "" {
   118  		if err := Handler.StartGoTrace(traceFile); err != nil {
   119  			return err
   120  		}
   121  	}
   122  	if cpuFile := ctx.GlobalString(cpuprofileFlag.Name); cpuFile != "" {
   123  		if err := Handler.StartCPUProfile(cpuFile); err != nil {
   124  			return err
   125  		}
   126  	}
   127  
   128  	// pprof server
   129  	if ctx.GlobalBool(pprofFlag.Name) {
   130  		address := fmt.Sprintf("%s:%d", ctx.GlobalString(pprofAddrFlag.Name), ctx.GlobalInt(pprofPortFlag.Name))
   131  		go func() {
   132  			log.Info("Starting pprof server", "addr", fmt.Sprintf("http://%s/debug/pprof", address))
   133  			if err := http.ListenAndServe(address, nil); err != nil {
   134  				log.Error("Failure in running pprof server", "err", err)
   135  			}
   136  		}()
   137  	}
   138  	return nil
   139  }
   140  
   141  // Exit stops all running profiles, flushing their output to the
   142  // respective file.
   143  func Exit() {
   144  	Handler.StopCPUProfile()
   145  	Handler.StopGoTrace()
   146  }