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forgejo/modules/graceful/restart_unix.go
zeripath cbaa1de9ec 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
2019-11-21 13:32:02 -05:00

81 lines
2.1 KiB
Go

// +build !windows
// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
// This code is heavily inspired by the archived gofacebook/gracenet/net.go handler
package graceful
import (
"fmt"
"os"
"os/exec"
"strings"
"sync"
"syscall"
)
var killParent sync.Once
// KillParent sends the kill signal to the parent process if we are a child
func KillParent() {
killParent.Do(func() {
if Manager.IsChild() {
ppid := syscall.Getppid()
if ppid > 1 {
_ = syscall.Kill(ppid, syscall.SIGTERM)
}
}
})
}
// RestartProcess starts a new process passing it the active listeners. It
// doesn't fork, but starts a new process using the same environment and
// arguments as when it was originally started. This allows for a newly
// deployed binary to be started. It returns the pid of the newly started
// process when successful.
func RestartProcess() (int, error) {
listeners := getActiveListeners()
// Extract the fds from the listeners.
files := make([]*os.File, len(listeners))
for i, l := range listeners {
var err error
// Now, all our listeners actually have File() functions so instead of
// individually casting we just use a hacky interface
files[i], err = l.(filer).File()
if err != nil {
return 0, err
}
// Remember to close these at the end.
defer files[i].Close()
}
// Use the original binary location. This works with symlinks such that if
// the file it points to has been changed we will use the updated symlink.
argv0, err := exec.LookPath(os.Args[0])
if err != nil {
return 0, err
}
// Pass on the environment and replace the old count key with the new one.
var env []string
for _, v := range os.Environ() {
if !strings.HasPrefix(v, listenFDs+"=") {
env = append(env, v)
}
}
env = append(env, fmt.Sprintf("%s=%d", listenFDs, len(listeners)))
allFiles := append([]*os.File{os.Stdin, os.Stdout, os.Stderr}, files...)
process, err := os.StartProcess(argv0, os.Args, &os.ProcAttr{
Dir: originalWD,
Env: env,
Files: allFiles,
})
if err != nil {
return 0, err
}
return process.Pid, nil
}