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// Copyright 2015 Daniel Theophanes.
// Use of this source code is governed by a zlib-style
// license that can be found in the LICENSE file.
// Simple service that only works by printing a log message every few seconds.
package main
import (
"encoding/json"
"flag"
"fmt"
"log"
"os"
"os/exec"
"path/filepath"
"github.com/kardianos/osext"
"github.com/kardianos/service"
)
// Config is the runner app config structure.
type Config struct {
Name, DisplayName, Description string
Dir string
Exec string
Args []string
Env []string
Stderr, Stdout string
}
var logger service.Logger
type program struct {
exit chan struct{}
service service.Service
*Config
cmd *exec.Cmd
}
func (p *program) Start(s service.Service) error {
// Look for exec.
// Verify home directory.
fullExec, err := exec.LookPath(p.Exec)
if err != nil {
return fmt.Errorf("Failed to find executable %q: %v", p.Exec, err)
}
p.cmd = exec.Command(fullExec, p.Args...)
p.cmd.Dir = p.Dir
p.cmd.Env = append(os.Environ(), p.Env...)
go p.run()
return nil
}
func (p *program) run() {
logger.Info("Starting ", p.DisplayName)
defer func() {
if service.Interactive() {
p.Stop(p.service)
} else {
p.service.Stop()
}
}()
if p.Stderr != "" {
f, err := os.OpenFile(p.Stderr, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0777)
if err != nil {
logger.Warningf("Failed to open std err %q: %v", p.Stderr, err)
return
}
defer f.Close()
p.cmd.Stderr = f
}
if p.Stdout != "" {
f, err := os.OpenFile(p.Stdout, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0777)
if err != nil {
logger.Warningf("Failed to open std out %q: %v", p.Stdout, err)
return
}
defer f.Close()
p.cmd.Stdout = f
}
err := p.cmd.Run()
if err != nil {
logger.Warningf("Error running: %v", err)
}
return
}
func (p *program) Stop(s service.Service) error {
close(p.exit)
logger.Info("Stopping ", p.DisplayName)
if p.cmd.ProcessState.Exited() == false {
p.cmd.Process.Kill()
}
if service.Interactive() {
os.Exit(0)
}
return nil
}
func getConfigPath() (string, error) {
fullexecpath, err := osext.Executable()
if err != nil {
return "", err
}
dir, execname := filepath.Split(fullexecpath)
ext := filepath.Ext(execname)
name := execname[:len(execname)-len(ext)]
return filepath.Join(dir, name+".json"), nil
}
func getConfig(path string) (*Config, error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
defer f.Close()
conf := &Config{}
r := json.NewDecoder(f)
err = r.Decode(&conf)
if err != nil {
return nil, err
}
return conf, nil
}
func main() {
svcFlag := flag.String("service", "", "Control the system service.")
flag.Parse()
configPath, err := getConfigPath()
if err != nil {
log.Fatal(err)
}
config, err := getConfig(configPath)
if err != nil {
log.Fatal(err)
}
svcConfig := &service.Config{
Name: config.Name,
DisplayName: config.DisplayName,
Description: config.Description,
}
prg := &program{
exit: make(chan struct{}),
Config: config,
}
s, err := service.New(prg, svcConfig)
if err != nil {
log.Fatal(err)
}
prg.service = s
errs := make(chan error, 5)
logger, err = s.Logger(errs)
if err != nil {
log.Fatal(err)
}
go func() {
for {
err := <-errs
if err != nil {
log.Print(err)
}
}
}()
if len(*svcFlag) != 0 {
err := service.Control(s, *svcFlag)
if err != nil {
log.Printf("Valid actions: %q\n", service.ControlAction)
log.Fatal(err)
}
return
}
err = s.Run()
if err != nil {
logger.Error(err)
}
}
|
