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dwelling-radio/internal/radio/liquidsoap/liquidsoap.go

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package liquidsoap
import (
"os"
"os/exec"
"syscall"
"time"
"github.com/pkg/errors"
)
var ErrNotRunning = errors.New("liquidsoap is not running")
type Liquidsoap struct {
command *exec.Cmd
}
func NewLiquidsoap(liquidsoapPath, scriptPath string) (*Liquidsoap, error) {
if _, err := exec.LookPath(liquidsoapPath); err != nil {
return nil, err
}
cmd := exec.Command(liquidsoapPath, scriptPath)
if err := cmd.Start(); err != nil {
return nil, err
}
// If there are errors in a script this time will be sufficient to wait
// for them to occure.
time.Sleep(4 * time.Second)
if _, err := os.FindProcess(cmd.Process.Pid); err != nil {
if err_wait := cmd.Wait(); err != nil {
return nil, errors.Wrap(err, err_wait.Error())
}
return nil, err
}
return &Liquidsoap{
command: cmd}, nil
}
func (l *Liquidsoap) Stop() error {
if !l.IsRunning() {
return ErrNotRunning
}
if err := l.command.Process.Signal(syscall.SIGINT); err != nil {
return err
}
if err := l.command.Wait(); err != nil {
return err
}
return nil
}
func (l *Liquidsoap) IsRunning() bool {
return l.command.Process != nil && l.command.ProcessState == nil
}