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// Copyright 2012-2018 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"fmt"
"os"
"os/signal"
"time"
"golang.org/x/sys/windows/svc"
"golang.org/x/sys/windows/svc/mgr"
)
// Signal Handling
func (s *Server) handleSignals() {
if s.getOpts().NoSigs {
return
}
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
for sig := range c {
s.Debugf("Trapped %q signal", sig)
s.Noticef("Server Exiting..")
os.Exit(0)
}
}()
}
// ProcessSignal sends the given signal command to the running gnatsd service.
// If service is empty, this signals the "gnatsd" service. This returns an
// error is the given service is not running or the command is invalid.
func ProcessSignal(command Command, service string) error {
if service == "" {
service = serviceName
}
m, err := mgr.Connect()
if err != nil {
return err
}
defer m.Disconnect()
s, err := m.OpenService(service)
if err != nil {
return fmt.Errorf("could not access service: %v", err)
}
defer s.Close()
var (
cmd svc.Cmd
to svc.State
)
switch command {
case CommandStop, CommandQuit:
cmd = svc.Stop
to = svc.Stopped
case CommandReopen:
cmd = reopenLogCmd
to = svc.Running
case CommandReload:
cmd = svc.ParamChange
to = svc.Running
case commandLDMode:
cmd = ldmCmd
to = svc.Running
default:
return fmt.Errorf("unknown signal %q", command)
}
status, err := s.Control(cmd)
if err != nil {
return fmt.Errorf("could not send control=%d: %v", cmd, err)
}
timeout := time.Now().Add(10 * time.Second)
for status.State != to {
if timeout.Before(time.Now()) {
return fmt.Errorf("timeout waiting for service to go to state=%d", to)
}
time.Sleep(300 * time.Millisecond)
status, err = s.Query()
if err != nil {
return fmt.Errorf("could not retrieve service status: %v", err)
}
}
return nil
}
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