Add 'ww debug trace' command.

internal/cmd/debug/debug.go

@@ -24,7 +24,7 @@ var subcommands = []*cli.Command{
 	env(),
 	info(),
 	profile(),
-	// trace(),
+	trace(),
 }
 
 func Command() *cli.Command {

internal/cmd/debug/profile.go

@@ -2,10 +2,8 @@ package debug
 
 import (
 	"bytes"
-	"errors"
 	"fmt"
 	"io"
-	"os"
 	"time"
 
 	"github.com/urfave/cli/v2"
@@ -93,15 +91,3 @@ func runPprof() cli.ActionFunc {
 		}
 	}
 }
-
-func writer(c *cli.Context) (*os.File, error) {
-	if c.Bool("stdout") {
-		return os.Stdout, nil
-	}
-
-	if c.IsSet("out") {
-		return os.Create(c.Path("out"))
-	}
-
-	return nil, errors.New("must pass -out or -stdout")
-}

internal/cmd/debug/trace.go

@@ -0,0 +1,59 @@
+package debug
+
+import (
+	"time"
+
+	"github.com/urfave/cli/v2"
+)
+
+func trace() *cli.Command {
+	return &cli.Command{
+		Name:      "trace",
+		Usage:     "perform a runtime trace on a live host",
+		ArgsUsage: "<peer>",
+		Flags: []cli.Flag{
+			&cli.PathFlag{
+				Name:  "out",
+				Usage: "output file",
+			},
+			&cli.DurationFlag{
+				Name:    "duration",
+				Aliases: []string{"dur"},
+				Usage:   "sampling duration for CPU profile",
+				Value:   time.Second,
+			},
+			&cli.BoolFlag{
+				Name:    "stdout",
+				Aliases: []string{"s"},
+				Usage:   "output samples to stdout",
+			},
+		},
+		Action: runTrace(),
+	}
+}
+
+func runTrace() cli.ActionFunc {
+	return func(c *cli.Context) error {
+		// a, release := node.Walk(c.Context, target(c))
+		// defer release()
+
+		// d, release := anchor.Host(a).Debug(c.Context)
+		// defer release()
+
+		// TEST
+		d, release := node.Debug(c.Context)
+		defer release()
+		// -- TEST
+
+		tracer, release := d.Tracer(c.Context)
+		defer release()
+
+		w, err := writer(c)
+		if err != nil {
+			return err
+		}
+		defer w.Close()
+
+		return tracer.Sample(c.Context, w, c.Duration("dur"))
+	}
+}

internal/cmd/debug/util.go

@@ -0,0 +1,20 @@
+package debug
+
+import (
+	"errors"
+	"os"
+
+	"github.com/urfave/cli/v2"
+)
+
+func writer(c *cli.Context) (*os.File, error) {
+	if c.Bool("stdout") {
+		return os.Stdout, nil
+	}
+
+	if c.IsSet("out") {
+		return os.Create(c.Path("out"))
+	}
+
+	return nil, errors.New("must pass -out or -stdout")
+}