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package signal
import (
"io"
"os"
"os/signal"
"syscall"
"github.com/mpolden/zdns/log"
)
// Reloader is the interface for types that need to act on a reload signal.
type Reloader interface {
Reload()
}
// Handler represents a signal handler and holds references to types that should act on operating system signals.
type Handler struct {
logger *log.Logger
signal chan os.Signal
reloaders []Reloader
closers []io.Closer
}
// NewHandler creates a new handler for handling operating system signals.
func NewHandler(c chan os.Signal, logger *log.Logger) *Handler {
h := &Handler{logger: logger, signal: c}
signal.Notify(h.signal)
go h.readSignal()
return h
}
// OnReload registers a reloader to call for the signal SIGHUP.
func (s *Handler) OnReload(r Reloader) { s.reloaders = append(s.reloaders, r) }
// OnClose registers a closer to call for signals SIGTERM and SIGINT.
func (s *Handler) OnClose(c io.Closer) { s.closers = append(s.closers, c) }
func (s *Handler) readSignal() {
for sig := range s.signal {
switch sig {
case syscall.SIGHUP:
s.logger.Printf("received signal %s: reloading", sig)
for _, r := range s.reloaders {
r.Reload()
}
case syscall.SIGTERM, syscall.SIGINT:
signal.Stop(s.signal)
s.logger.Printf("received signal %s: shutting down", sig)
for _, c := range s.closers {
if err := c.Close(); err != nil {
s.logger.Printf("close failed: %s", err)
}
}
default:
s.logger.Printf("received signal %s: ignoring", sig)
}
}
}
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