1 files changed, 117 insertions, 0 deletions
diff --git a/internal/debug/flags.go b/internal/debug/flags.go
new file mode 100644
index 000000000..22e524cd6
--- /dev/null
+++ b/internal/debug/flags.go
@@ -0,0 +1,117 @@
+// 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",
+	}
+	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()
+}