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package interrupt
import (
"fmt"
"os"
"os/signal"
"syscall"
)
// Cleaner type refers to a function with no inputs that returns an error
type Cleaner func() error
var cleaners []Cleaner
var active = false
// RegisterCleaner is responsible for registering a cleaner function. When a function is registered, the Signal watcher is started in a goroutine.
func RegisterCleaner(f ...Cleaner) {
for _, fn := range f {
cleaners = append([]Cleaner{fn}, cleaners...)
if !active {
active = true
go func() {
ch := make(chan os.Signal, 1)
signal.Notify(ch, syscall.SIGINT, syscall.SIGTERM, os.Interrupt)
<-ch
// Prevent un-terminated ^C character in terminal
fmt.Println()
errl := clean()
for _, err := range errl {
fmt.Println(err)
}
os.Exit(1)
}()
}
}
}
// clean invokes all registered cleanup functions, and returns a list of errors, if they exist.
func clean() (errorlist []error) {
for _, f := range cleaners {
err := f()
if err != nil {
errorlist = append(errorlist, err)
}
}
cleaners = []Cleaner{}
return
}
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