AdGuardHome/internal/next/cmd/signal.go

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package cmd
import (
"io/fs"
"os"
"time"
"github.com/AdguardTeam/AdGuardHome/internal/aghos"
"github.com/AdguardTeam/AdGuardHome/internal/next/agh"
"github.com/AdguardTeam/AdGuardHome/internal/next/configmgr"
"github.com/AdguardTeam/golibs/log"
)
// signalHandler processes incoming signals and shuts services down.
type signalHandler struct {
// signal is the channel to which OS signals are sent.
signal chan os.Signal
// confFile is the path to the configuration file.
confFile string
// frontend is the filesystem with the frontend and other statically
// compiled files.
frontend fs.FS
// start is the time at which AdGuard Home has been started.
start time.Time
// services are the services that are shut down before application exiting.
services []agh.Service
}
// handle processes OS signals.
func (h *signalHandler) handle() {
defer log.OnPanic("signalHandler.handle")
for sig := range h.signal {
log.Info("sighdlr: received signal %q", sig)
if aghos.IsReconfigureSignal(sig) {
h.reconfigure()
} else if aghos.IsShutdownSignal(sig) {
status := h.shutdown()
log.Info("sighdlr: exiting with status %d", status)
os.Exit(status)
}
}
}
// reconfigure rereads the configuration file and updates and restarts services.
func (h *signalHandler) reconfigure() {
log.Info("sighdlr: reconfiguring adguard home")
status := h.shutdown()
if status != statusSuccess {
log.Info("sighdlr: reconfiguring: exiting with status %d", status)
os.Exit(status)
}
// TODO(a.garipov): This is a very rough way to do it. Some services can be
// reconfigured without the full shutdown, and the error handling is
// currently not the best.
confMgr, err := configmgr.New(h.confFile, h.frontend, h.start)
check(err)
web := confMgr.Web()
err = web.Start()
check(err)
dns := confMgr.DNS()
err = dns.Start()
check(err)
h.services = []agh.Service{
dns,
web,
}
log.Info("sighdlr: successfully reconfigured adguard home")
}
// Exit status constants.
const (
statusSuccess = 0
statusError = 1
)
// shutdown gracefully shuts down all services.
func (h *signalHandler) shutdown() (status int) {
ctx, cancel := ctxWithDefaultTimeout()
defer cancel()
status = statusSuccess
log.Info("sighdlr: shutting down services")
for i, service := range h.services {
err := service.Shutdown(ctx)
if err != nil {
log.Error("sighdlr: shutting down service at index %d: %s", i, err)
status = statusError
}
}
return status
}
// newSignalHandler returns a new signalHandler that shuts down svcs.
func newSignalHandler(
confFile string,
frontend fs.FS,
start time.Time,
svcs ...agh.Service,
) (h *signalHandler) {
h = &signalHandler{
signal: make(chan os.Signal, 1),
confFile: confFile,
frontend: frontend,
start: start,
services: svcs,
}
aghos.NotifyShutdownSignal(h.signal)
aghos.NotifyReconfigureSignal(h.signal)
return h
}