miniflux-v2/cli/sd_notify.go
Ilya Mateyko 89c1b3b4d8 Systemd readiness notification
This change implements the systemd readiness notification, using
the sd_notify protocol.

See https://www.freedesktop.org/software/systemd/man/sd_notify.html.
2021-03-16 20:14:43 -07:00

43 lines
957 B
Go

// Copyright 2021 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
package cli // import "miniflux.app/cli"
import (
"net"
"os"
)
const (
// sdNotifyReady tells the service manager that service startup is
// finished, or the service finished loading its configuration.
sdNotifyReady = "READY=1"
)
// sdNotify sends a message to systemd using the sd_notify protocol.
// See https://www.freedesktop.org/software/systemd/man/sd_notify.html.
func sdNotify(state string) error {
addr := &net.UnixAddr{
Net: "unixgram",
Name: os.Getenv("NOTIFY_SOCKET"),
}
if addr.Name == "" {
// We're not running under systemd (NOTIFY_SOCKET has not set).
return nil
}
conn, err := net.DialUnix(addr.Net, nil, addr)
if err != nil {
return err
}
defer conn.Close()
if _, err = conn.Write([]byte(state)); err != nil {
return err
}
return nil
}