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A wrapper around `exec.Command(...).Output()` to execute external commands / binaries with support for cancellation signals via channels (i.e. terminate the running process).
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| package main | |
| import ( | |
| "errors" | |
| "log" | |
| "os/exec" | |
| ) | |
| var ( | |
| ErrCmdCancelled = errors.New("command cancelled") | |
| ) | |
| func Execute(command []string, done <-chan struct{}) ([]byte, error) { | |
| cmd := exec.Command(command[0], command[1:]...) | |
| outCh := make(chan []byte, 1) | |
| errCh := make(chan error, 1) | |
| go func() { | |
| out, err := cmd.Output() | |
| if err != nil { | |
| errCh <- err | |
| return | |
| } | |
| outCh <- out | |
| }() | |
| select { | |
| case out := <-outCh: | |
| close(errCh) | |
| return out, nil | |
| case err := <-errCh: | |
| close(outCh) | |
| return nil, err | |
| case <-done: | |
| log.Println("exiting") | |
| // if (cmd.ProcessState == nil || cmd.ProcessState.Exited() == false) && cmd.Process != nil { | |
| if cmd.Process != nil { | |
| if err := cmd.Process.Kill(); err != nil { | |
| return nil, err | |
| } | |
| } | |
| return nil, ErrCmdCancelled | |
| } | |
| } |
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Pro-tip: use a
Contextinstead!