Add Graceful shutdown for Windows and hooks for shutdown of goroutines (#8964)

* Graceful Shutdown for windows and others

Restructures modules/graceful, adding shutdown for windows, removing and
replacing the old minwinsvc code.

Creates a new waitGroup - terminate which allows for goroutines to
finish up after the shutdown of the servers.

Shutdown and terminate hooks are added for goroutines.

* Remove unused functions - these can be added in a different PR

* Add startup timeout functionality

* Document STARTUP_TIMEOUT

5 files changed, 0 insertions, 143 deletions

diff --git a/modules/minwinsvc/LICENSE b/modules/minwinsvc/LICENSE
deleted file mode 100644
index fce91b4e1a..0000000000
--- a/modules/minwinsvc/LICENSE
+++ /dev/null
@@ -1,20 +0,0 @@
-Copyright (c) 2015 Daniel Theophanes
-
-This software is provided 'as-is', without any express or implied
-warranty. In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
-   1. The origin of this software must not be misrepresented; you must not
-   claim that you wrote the original software. If you use this software
-   in a product, an acknowledgment in the product documentation would be
-   appreciated but is not required.
-
-   2. Altered source versions must be plainly marked as such, and must not be
-   misrepresented as being the original software.
-
-   3. This notice may not be removed or altered from any source
-   distribution.
diff --git a/modules/minwinsvc/README.md b/modules/minwinsvc/README.md
deleted file mode 100644
index 260dceeac3..0000000000
--- a/modules/minwinsvc/README.md
+++ /dev/null
@@ -1,18 +0,0 @@
-### Minimal windows service stub
-
-Programs designed to run from most *nix style operating systems
-can import this package to enable running programs as services without modifying
-them.
-
-```
-import _ "github.com/kardianos/minwinsvc"
-```
-
-If you need more control over the exit behavior, set
-```
-minwinsvc.SetOnExit(func() {
-	// Do something.
-	// Within 10 seconds call:
-	os.Exit(0)
-})
-```
diff --git a/modules/minwinsvc/minwinsvc.go b/modules/minwinsvc/minwinsvc.go
deleted file mode 100644
index 4cd89ffdb4..0000000000
--- a/modules/minwinsvc/minwinsvc.go
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright 2015 Daniel Theophanes.
-// Use of this source code is governed by a zlib-style
-// license that can be found in the LICENSE file.package service
-
-// Package minwinsvc is a minimal non-invasive windows only service stub.
-//
-// Import to allow running as a windows service.
-//   import _ "github.com/kardianos/minwinsvc"
-// This will detect if running as a windows service
-// and install required callbacks for windows.
-package minwinsvc
-
-// SetOnExit sets the function to be called when the windows service
-// requests an exit. If this is not called, or if it is called where
-// f == nil, then it defaults to calling "os.Exit(0)".
-func SetOnExit(f func()) {
-	setOnExit(f)
-}
diff --git a/modules/minwinsvc/svc_other.go b/modules/minwinsvc/svc_other.go
deleted file mode 100644
index 197d30021f..0000000000
--- a/modules/minwinsvc/svc_other.go
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright 2015 Daniel Theophanes.
-// Use of this source code is governed by a zlib-style
-// license that can be found in the LICENSE file.package service
-
-//+build !windows
-
-package minwinsvc
-
-func setOnExit(f func()) {
-	// Nothing.
-}
diff --git a/modules/minwinsvc/svc_windows.go b/modules/minwinsvc/svc_windows.go
deleted file mode 100644
index 609bf06d3a..0000000000
--- a/modules/minwinsvc/svc_windows.go
+++ /dev/null
@@ -1,76 +0,0 @@
-// Copyright 2015 Daniel Theophanes.
-// Use of this source code is governed by a zlib-style
-// license that can be found in the LICENSE file.package service
-
-//+build windows
-
-package minwinsvc
-
-import (
-	"os"
-	"strconv"
-	"sync"
-
-	"golang.org/x/sys/windows/svc"
-)
-
-var (
-	onExit  func()
-	guard   sync.Mutex
-	skip, _ = strconv.ParseBool(os.Getenv("SKIP_MINWINSVC"))
-	isSSH   = os.Getenv("SSH_ORIGINAL_COMMAND") != ""
-)
-
-func init() {
-	if skip || isSSH {
-		return
-	}
-	interactive, err := svc.IsAnInteractiveSession()
-	if err != nil {
-		panic(err)
-	}
-	if interactive {
-		return
-	}
-	go func() {
-		_ = svc.Run("", runner{})
-
-		guard.Lock()
-		f := onExit
-		guard.Unlock()
-
-		// Don't hold this lock in user code.
-		if f != nil {
-			f()
-		}
-		// Make sure we exit.
-		os.Exit(0)
-	}()
-}
-
-func setOnExit(f func()) {
-	guard.Lock()
-	onExit = f
-	guard.Unlock()
-}
-
-type runner struct{}
-
-func (runner) Execute(args []string, r <-chan svc.ChangeRequest, changes chan<- svc.Status) (bool, uint32) {
-	const cmdsAccepted = svc.AcceptStop | svc.AcceptShutdown
-	changes <- svc.Status{State: svc.StartPending}
-
-	changes <- svc.Status{State: svc.Running, Accepts: cmdsAccepted}
-	for {
-		c := <-r
-		switch c.Cmd {
-		case svc.Interrogate:
-			changes <- c.CurrentStatus
-		case svc.Stop, svc.Shutdown:
-			changes <- svc.Status{State: svc.StopPending}
-			return false, 0
-		}
-	}
-
-	return false, 0
-}