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command.go
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command.go
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// Copyright 2016 Documize Inc. <legal@documize.com>. All rights reserved.
//
// This software (Documize Community Edition) is licensed under
// GNU AGPL v3 http://www.gnu.org/licenses/agpl-3.0.en.html
//
// You can operate outside the AGPL restrictions by purchasing
// Documize Enterprise Edition and obtaining a commercial license
// by contacting <sales@documize.com>.
//
// https://documize.com
package osutil
import (
"bytes"
"errors"
"os/exec"
"time"
"github.com/documize/community/core/log"
)
var errTimeout = errors.New("conversion timelimit exceeded")
// CommandWithTimeout runs a command but stops it if it does not finish within the timout above.
func CommandWithTimeout(command *exec.Cmd, timeout time.Duration) ([]byte, error) {
var output bytes.Buffer
//fmt.Println("DEBUG CommandWithTimeout: %v", command.Args)
command.Stdout = &output
command.Stderr = &output
if err := command.Start(); err != nil {
return nil, err
}
done := make(chan error, 1)
defer close(done)
go func() {
done <- command.Wait()
}()
select {
case <-time.After(timeout):
if err := command.Process.Kill(); err != nil {
log.Error("failed to kill: ", err)
}
<-done // prevent memory leak
//fmt.Println("DEBUG timeout")
return nil, errTimeout
case err := <-done:
if err != nil {
//fmt.Println("DEBUG error return")
return output.Bytes(), err
}
if !command.ProcessState.Success() {
err = errors.New(string(output.Bytes()))
//fmt.Println("DEBUG not successful")
return nil, err
}
//fmt.Println("DEBUG successful return")
return output.Bytes(), nil
}
}