95 lines
1.8 KiB
Go
95 lines
1.8 KiB
Go
package main
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import (
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"context"
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"fmt"
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"os"
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"os/signal"
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"path/filepath"
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"runtime/pprof"
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"time"
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"github.com/urfave/cli/v2"
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)
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func takeProfiles(ctx context.Context) (fname string, _err error) {
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dir, err := os.MkdirTemp(".", ".profiles-temp*")
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if err != nil {
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return "", err
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}
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if err := writeProfiles(ctx, dir); err != nil {
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_ = os.RemoveAll(dir)
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return "", err
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}
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fname = fmt.Sprintf("pprof-simulation-%s", time.Now().Format(time.RFC3339))
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if err := os.Rename(dir, fname); err != nil {
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_ = os.RemoveAll(dir)
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return "", err
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}
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return fname, nil
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}
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func writeProfiles(ctx context.Context, dir string) error {
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for _, profile := range pprof.Profiles() {
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file, err := os.Create(filepath.Join(dir, profile.Name()+".pprof.gz"))
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if err != nil {
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return err
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}
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if err := profile.WriteTo(file, 0); err != nil {
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_ = file.Close()
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return err
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}
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if err := file.Close(); err != nil {
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return err
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}
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if err := ctx.Err(); err != nil {
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return err
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}
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}
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file, err := os.Create(filepath.Join(dir, "cpu.pprof.gz"))
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if err != nil {
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return err
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}
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if err := pprof.StartCPUProfile(file); err != nil {
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_ = file.Close()
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return err
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}
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select {
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case <-time.After(30 * time.Second):
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case <-ctx.Done():
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}
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pprof.StopCPUProfile()
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err = file.Close()
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if err := ctx.Err(); err != nil {
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return err
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}
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return err
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}
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func profileOnSignal(cctx *cli.Context, signals ...os.Signal) {
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ch := make(chan os.Signal, 1)
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signal.Notify(ch, signals...)
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defer signal.Stop(ch)
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for {
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select {
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case <-ch:
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fname, err := takeProfiles(cctx.Context)
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switch err {
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case context.Canceled:
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return
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case nil:
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_, _ = fmt.Fprintf(cctx.App.ErrWriter, "Wrote profile to %q\n", fname)
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default:
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_, _ = fmt.Fprintf(cctx.App.ErrWriter, "ERROR: failed to write profile: %s\n", err)
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}
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case <-cctx.Done():
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return
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}
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}
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}
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