/
trace.go
61 lines (52 loc) · 1.3 KB
/
trace.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
// Copyright 2024 Jetify Inc. and contributors. All rights reserved.
// Use of this source code is governed by the license in the LICENSE file.
package midcobra
import (
"context"
"os"
"runtime/trace"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
)
type TraceMiddleware struct {
tracef *os.File
flag *pflag.Flag
task *trace.Task
}
var _ Middleware = (*DebugMiddleware)(nil)
func (t *TraceMiddleware) AttachToFlag(flags *pflag.FlagSet, flagName string) {
flags.String(flagName, "", "write a trace to a file")
t.flag = flags.Lookup(flagName)
t.flag.Hidden = true
t.flag.NoOptDefVal = "trace.out"
}
func (t *TraceMiddleware) preRun(cmd *cobra.Command, _ []string) {
if t == nil {
return
}
path := t.flag.Value.String()
if path == "" {
return
}
var err error
t.tracef, err = os.Create(path)
if err != nil {
panic("error enabling tracing: " + err.Error())
}
if err := trace.Start(t.tracef); err != nil {
panic("error enabling tracing: " + err.Error())
}
var ctx context.Context
ctx, t.task = trace.NewTask(cmd.Context(), "cliCommand")
cmd.SetContext(ctx)
}
func (t *TraceMiddleware) postRun(*cobra.Command, []string, error) {
if t.tracef == nil {
return
}
t.task.End()
trace.Stop()
if err := t.tracef.Close(); err != nil {
panic("error closing trace file: " + err.Error())
}
}