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exit.go
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exit.go
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package gsignal
import (
// import for a
_ "net/http/pprof"
"os"
"os/signal"
"sync"
"sync/atomic"
"syscall"
)
// syscall.SIGTNT (os.Interrupt): ctrl +c
// syscall.SIGTERM: kill, killall
// syscall.SIGHUP: hangup (terminal closed)
var reged = func() atomic.Value { s := atomic.Value{}; s.Store(false); return s }()
var exitSigCh = make(chan os.Signal, 1)
var closeCh = make(chan string)
var onExitCallbacks = make([]ExitHandler, 0)
var onExitMu sync.Mutex
type ExitHandler func(sig os.Signal, closemsg string)
// adds exit callback, callbacks will be executed before exit
// Notice:
// Can catch kill / killall / Hangup(close terminal)
// Can't catch os.Exit, main() return and exception panic crash
func RegisterExitCallback(f ExitHandler) {
onExitMu.Lock()
onExitCallbacks = append(onExitCallbacks, f)
onExitMu.Unlock()
// catch signals
if !reged.Load().(bool) {
signal.Notify(exitSigCh, os.Interrupt, syscall.SIGKILL, syscall.SIGTERM, syscall.SIGQUIT, syscall.SIGHUP)
reged.Store(true)
go waitExitSignals()
}
}
// Wait the signals for exit
// Return caught signal
func waitExitSignals() {
var sig os.Signal
var closemsg string
// wait
select {
case sig = <-exitSigCh:
case closemsg = <-closeCh:
}
// execute callback functions
onExitMu.Lock()
cbs := onExitCallbacks
onExitMu.Unlock()
for _, f := range cbs {
f(sig, closemsg)
}
// quit application
os.Exit(0)
}
// Exit send close signal with given message
func CloseWaiter(message string) {
closeCh <- message
}