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// Copyright 2015 Matthew Holt and The Caddy Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package notify provides facilities for notifying process managers
// of state changes, mainly for when running as a system service.
package notify
import (
"io"
"net"
"os"
"strings"
)
// The documentation about this IPC protocol is available here:
// https://www.freedesktop.org/software/systemd/man/sd_notify.html
func sdNotify(path, payload string) error {
socketAddr := &net.UnixAddr{
Name: path,
Net: "unixgram",
}
conn, err := net.DialUnix(socketAddr.Net, nil, socketAddr)
if err != nil {
return err
}
defer conn.Close()
if _, err := io.Copy(conn, strings.NewReader(payload)); err != nil {
return err
}
return nil
}
// notifyReadiness notifies systemd that caddy has finished its
// initialization routines.
func notifyReadiness() error {
val, ok := os.LookupEnv("NOTIFY_SOCKET")
if !ok || val == "" {
return nil
}
if err := sdNotify(val, "READY=1"); err != nil {
return err
}
return nil
}
// notifyReloading notifies systemd that caddy is reloading its config.
func notifyReloading() error {
val, ok := os.LookupEnv("NOTIFY_SOCKET")
if !ok || val == "" {
return nil
}
if err := sdNotify(val, "RELOADING=1"); err != nil {
return err
}
return nil
}
// notifyStopping notifies systemd that caddy is stopping.
func notifyStopping() error {
val, ok := os.LookupEnv("NOTIFY_SOCKET")
if !ok || val == "" {
return nil
}
if err := sdNotify(val, "STOPPING=1"); err != nil {
return err
}
return nil
}
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