Daniel Theophanes
126 lines
2.2 KiB
Go
126 lines
2.2 KiB
Go
package service
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import (
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"fmt"
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"log/syslog"
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"os"
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"os/signal"
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"text/template"
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)
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func newService(name, displayName, description string) (s *linuxUpstartService, err error) {
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s = &linuxUpstartService{
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name: name,
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displayName: displayName,
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description: description,
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}
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s.logger, err = syslog.New(syslog.LOG_INFO, name)
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if err != nil {
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return nil, err
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}
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return s, nil
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}
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type linuxUpstartService struct {
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name, displayName, description string
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logger *syslog.Writer
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}
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func (s *linuxUpstartService) Install() error {
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var confPath = "/etc/init/" + s.name + ".conf"
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_, err := os.Stat(confPath)
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if err == nil {
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return fmt.Errorf("Init already exists: %s", confPath)
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}
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f, err := os.Create(confPath)
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if err != nil {
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return err
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}
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defer f.Close()
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path, err := getExePath()
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if err != nil {
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return err
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}
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var to = &struct {
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Display string
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Description string
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Path string
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}{
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s.displayName,
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s.description,
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path,
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}
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t := template.Must(template.New("upstartScript").Parse(upstartScript))
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err = t.Execute(f, to)
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if err != nil {
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return err
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}
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return nil
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}
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func (s *linuxUpstartService) Remove() error {
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return os.Remove("/etc/init/" + s.name + ".conf")
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}
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func (s *linuxUpstartService) Run(onStart, onStop func() error) error {
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var err error
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err = onStart()
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if err != nil {
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return err
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}
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var sigChan = make(chan os.Signal, 3)
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signal.Notify(sigChan, os.Interrupt, os.Kill)
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<-sigChan
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return onStop()
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}
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func (s *linuxUpstartService) LogError(format string, a ...interface{}) error {
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return s.logger.Err(fmt.Sprintf(format, a...))
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}
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func (s *linuxUpstartService) LogWarning(format string, a ...interface{}) error {
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return s.logger.Warning(fmt.Sprintf(format, a...))
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}
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func (s *linuxUpstartService) LogInfo(format string, a ...interface{}) error {
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return s.logger.Info(fmt.Sprintf(format, a...))
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}
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func getExePath() (exePath string, err error) {
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return os.Readlink(`/proc/self/exe`)
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}
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var upstartScript = `# {{.Description}}
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description "{{.Display}}"
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start on filesystem or runlevel [2345]
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stop on runlevel [!2345]
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kill signal INT
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respawn
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respawn limit 10 5
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umask 022
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console none
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pre-start script
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test -x {{.Path}} || { stop; exit 0; }
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end script
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# Start
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exec {{.Path}}
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`
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