75 lines
2 KiB
Go
75 lines
2 KiB
Go
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// Copyright 2021 Frédéric Guillot. All rights reserved.
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// Use of this source code is governed by the Apache 2.0
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// license that can be found in the LICENSE file.
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package systemd // import "miniflux.app/systemd"
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import (
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"fmt"
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"net"
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"os"
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"strconv"
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"time"
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)
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const (
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// SdNotifyReady tells the service manager that service startup is
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// finished, or the service finished loading its configuration.
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// https://www.freedesktop.org/software/systemd/man/sd_notify.html#READY=1
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SdNotifyReady = "READY=1"
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// SdNotifyWatchdog the service manager to update the watchdog timestamp.
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// https://www.freedesktop.org/software/systemd/man/sd_notify.html#WATCHDOG=1
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SdNotifyWatchdog = "WATCHDOG=1"
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)
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// HasNotifySocket checks if the process is supervised by Systemd and has the notify socket.
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func HasNotifySocket() bool {
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return os.Getenv("NOTIFY_SOCKET") != ""
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}
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// HasSystemdWatchdog checks if the watchdog is configured in Systemd unit file.
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func HasSystemdWatchdog() bool {
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return os.Getenv("WATCHDOG_USEC") != ""
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}
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// WatchdogInterval returns the watchdog interval configured in systemd unit file.
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func WatchdogInterval() (time.Duration, error) {
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s, err := strconv.Atoi(os.Getenv("WATCHDOG_USEC"))
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if err != nil {
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return 0, fmt.Errorf(`systemd: error converting WATCHDOG_USEC: %v`, err)
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}
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if s <= 0 {
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return 0, fmt.Errorf(`systemd: error WATCHDOG_USEC must be a positive number`)
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}
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return time.Duration(s) * time.Microsecond, nil
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}
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// SdNotify sends a message to systemd using the sd_notify protocol.
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// See https://www.freedesktop.org/software/systemd/man/sd_notify.html.
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func SdNotify(state string) error {
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addr := &net.UnixAddr{
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Net: "unixgram",
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Name: os.Getenv("NOTIFY_SOCKET"),
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}
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if addr.Name == "" {
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// We're not running under systemd (NOTIFY_SOCKET is not set).
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return nil
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}
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conn, err := net.DialUnix(addr.Net, nil, addr)
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if err != nil {
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return err
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}
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defer conn.Close()
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if _, err = conn.Write([]byte(state)); err != nil {
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return err
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}
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return nil
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}
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