81 lines
1.3 KiB
Go
81 lines
1.3 KiB
Go
package goshutdowner
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import (
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"os"
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"os/signal"
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"sync"
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"syscall"
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)
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// Simple struct, use like a sync.Mutex
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//
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// var s goshutdowner.Shutdowner
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// s.Add(func() {
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// log.Println("Shutting down")
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// })
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type Shutdowner struct {
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initialized bool
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quit chan os.Signal
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funcs []ShutdownFunc
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wg sync.WaitGroup
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mutex sync.RWMutex
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}
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type ShutdownFunc func()
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// Internal method
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func (s *Shutdowner) init() {
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if s.initialized {
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return
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}
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s.quit = make(chan os.Signal, 1)
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signal.Notify(s.quit,
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os.Interrupt,
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syscall.SIGINT,
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syscall.SIGTERM, // e.g. Docker stop
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)
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go func() {
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<-s.quit
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s.Shutdown()
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}()
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s.initialized = true
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}
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// Add a func, that should be called with s.Shutdown() or when receiving a shutdown signal
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func (s *Shutdowner) Add(f ShutdownFunc) {
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s.init()
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s.mutex.Lock()
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s.wg.Add(1)
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s.funcs = append(s.funcs, f)
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s.mutex.Unlock()
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}
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// Trigger shutdown directly
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func (s *Shutdowner) Shutdown() {
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s.init()
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s.mutex.RLock()
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for _, f := range s.funcs {
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go func(f func()) {
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defer s.wg.Done()
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f()
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}(f)
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}
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s.mutex.RUnlock()
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s.wg.Wait()
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}
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// Wait till all functions finished
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func (s *Shutdowner) Wait() {
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s.init()
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s.wg.Wait()
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}
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// Shutdown and wait till shutdown finished. Shorthand for:
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//
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// s.Shutdown()
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// s.Wait()
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func (s *Shutdowner) ShutdownAndWait() {
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s.Shutdown()
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s.Wait()
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}
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