func SetupCPUProfile(app *cli.App) {
app.Flags = append(app.Flags, cli.StringFlag{
Name: "cpuprofile",
Usage: "write cpu profile to file",
EnvVar: "CPU_PROFILE",
})
appBefore := app.Before
appAfter := app.After
app.Before = func(c *cli.Context) error {
if cpuProfile := c.String("cpuprofile"); cpuProfile != "" {
f, err := os.Create(cpuProfile)
if err != nil {
return err
}
pprof.StartCPUProfile(f)
}
if appBefore != nil {
return appBefore(c)
}
return nil
}
app.After = func(c *cli.Context) error {
pprof.StopCPUProfile()
if appAfter != nil {
return appAfter(c)
}
return nil
}
}