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	cleaners = append(cleaners, f)
19	if !active {
20		active = true
21		go func() {
22			ch := make(chan os.Signal, 1)
23			signal.Notify(ch, syscall.SIGINT, syscall.SIGTERM, os.Interrupt)
24			<-ch
25			// Prevent un-terminated ^C character in terminal
26			fmt.Println()
27			clean()
28			os.Exit(1)
29		}()
30	}
31}
32
33// Clean invokes all registered cleanup functions
34func clean() {
35	fmt.Println("Cleaning")
36	for _, f := range cleaners {
37		_ = f()
38	}
39	cleaners = []Cleaner{}
40}