1package interrupt
 2
 3import (
 4	"fmt"
 5	"os"
 6	"os/signal"
 7	"syscall"
 8)
 9
10// Cleaner type referes to a function with no inputs that returns an error
11type Cleaner func() error
12
13var cleaners []Cleaner
14var active = false
15
16// RegisterCleaner is responsible for regisreting a cleaner function. When a function is registered, the Signal watcher is started in a goroutine.
17func RegisterCleaner(f ...Cleaner) {
18	for _, fn := range f {
19		cleaners = append(cleaners, fn)
20		if !active {
21			active = true
22			go func() {
23				ch := make(chan os.Signal, 1)
24				signal.Notify(ch, syscall.SIGINT, syscall.SIGTERM, os.Interrupt)
25				<-ch
26				// Prevent un-terminated ^C character in terminal
27				fmt.Println()
28				clean()
29				os.Exit(1)
30			}()
31		}
32	}
33}
34
35// Clean invokes all registered cleanup functions
36func clean() {
37	fmt.Println("Cleaning")
38	for _, f := range cleaners {
39		_ = f()
40	}
41	cleaners = []Cleaner{}
42}