mirror of
https://github.com/gogrlx/nats-server.git
synced 2026-04-15 18:50:41 -07:00
2153a45050
for the process name and service name. This allows the reuse of this code in NATS Streaming Server by invoking the new setters to change the service and process names. Signed-off-by: Ivan Kozlovic <ivan@synadia.com>
128 lines
3.4 KiB
Go
128 lines
3.4 KiB
Go
// Copyright 2012-2018 The NATS Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package server
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import (
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"os"
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"time"
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"golang.org/x/sys/windows/svc"
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"golang.org/x/sys/windows/svc/debug"
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)
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const (
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reopenLogCode = 128
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reopenLogCmd = svc.Cmd(reopenLogCode)
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acceptReopenLog = svc.Accepted(reopenLogCode)
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)
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var serviceName = "gnatsd"
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// SetServiceName allows setting a different service name
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func SetServiceName(name string) {
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serviceName = name
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}
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// winServiceWrapper implements the svc.Handler interface for implementing
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// gnatsd as a Windows service.
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type winServiceWrapper struct {
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server *Server
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}
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var dockerized = false
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func init() {
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if v, exists := os.LookupEnv("NATS_DOCKERIZED"); exists && v == "1" {
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dockerized = true
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}
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}
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// Execute will be called by the package code at the start of
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// the service, and the service will exit once Execute completes.
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// Inside Execute you must read service change requests from r and
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// act accordingly. You must keep service control manager up to date
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// about state of your service by writing into s as required.
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// args contains service name followed by argument strings passed
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// to the service.
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// You can provide service exit code in exitCode return parameter,
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// with 0 being "no error". You can also indicate if exit code,
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// if any, is service specific or not by using svcSpecificEC
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// parameter.
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func (w *winServiceWrapper) Execute(args []string, changes <-chan svc.ChangeRequest,
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status chan<- svc.Status) (bool, uint32) {
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status <- svc.Status{State: svc.StartPending}
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go w.server.Start()
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// Wait for accept loop(s) to be started
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if !w.server.ReadyForConnections(10 * time.Second) {
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// Failed to start.
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return false, 1
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}
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status <- svc.Status{
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State: svc.Running,
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Accepts: svc.AcceptStop | svc.AcceptShutdown | svc.AcceptParamChange | acceptReopenLog,
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}
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loop:
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for change := range changes {
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switch change.Cmd {
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case svc.Interrogate:
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status <- change.CurrentStatus
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case svc.Stop, svc.Shutdown:
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w.server.Shutdown()
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break loop
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case reopenLogCmd:
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// File log re-open for rotating file logs.
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w.server.ReOpenLogFile()
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case svc.ParamChange:
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if err := w.server.Reload(); err != nil {
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w.server.Errorf("Failed to reload server configuration: %s", err)
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}
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default:
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w.server.Debugf("Unexpected control request: %v", change.Cmd)
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}
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}
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status <- svc.Status{State: svc.StopPending}
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return false, 0
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}
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// Run starts the NATS server as a Windows service.
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func Run(server *Server) error {
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if dockerized {
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server.Start()
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return nil
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}
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run := svc.Run
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isInteractive, err := svc.IsAnInteractiveSession()
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if err != nil {
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return err
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}
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if isInteractive {
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run = debug.Run
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}
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return run(serviceName, &winServiceWrapper{server})
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}
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// isWindowsService indicates if NATS is running as a Windows service.
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func isWindowsService() bool {
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if dockerized {
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return false
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}
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isInteractive, _ := svc.IsAnInteractiveSession()
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return !isInteractive
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}
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