mirror of https://github.com/miniflux/v2.git
75 lines
2.0 KiB
Go
75 lines
2.0 KiB
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 systemd // import "miniflux.app/systemd"
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
"os"
|
|
"strconv"
|
|
"time"
|
|
)
|
|
|
|
const (
|
|
// SdNotifyReady tells the service manager that service startup is
|
|
// finished, or the service finished loading its configuration.
|
|
// https://www.freedesktop.org/software/systemd/man/sd_notify.html#READY=1
|
|
SdNotifyReady = "READY=1"
|
|
|
|
// SdNotifyWatchdog the service manager to update the watchdog timestamp.
|
|
// https://www.freedesktop.org/software/systemd/man/sd_notify.html#WATCHDOG=1
|
|
SdNotifyWatchdog = "WATCHDOG=1"
|
|
)
|
|
|
|
// HasNotifySocket checks if the process is supervised by Systemd and has the notify socket.
|
|
func HasNotifySocket() bool {
|
|
return os.Getenv("NOTIFY_SOCKET") != ""
|
|
}
|
|
|
|
// HasSystemdWatchdog checks if the watchdog is configured in Systemd unit file.
|
|
func HasSystemdWatchdog() bool {
|
|
return os.Getenv("WATCHDOG_USEC") != ""
|
|
}
|
|
|
|
// WatchdogInterval returns the watchdog interval configured in systemd unit file.
|
|
func WatchdogInterval() (time.Duration, error) {
|
|
s, err := strconv.Atoi(os.Getenv("WATCHDOG_USEC"))
|
|
if err != nil {
|
|
return 0, fmt.Errorf(`systemd: error converting WATCHDOG_USEC: %v`, err)
|
|
}
|
|
|
|
if s <= 0 {
|
|
return 0, fmt.Errorf(`systemd: error WATCHDOG_USEC must be a positive number`)
|
|
}
|
|
|
|
return time.Duration(s) * time.Microsecond, nil
|
|
}
|
|
|
|
// 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 is 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
|
|
}
|