/
main.go
156 lines (136 loc) · 2.96 KB
/
main.go
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package main
import (
"flag"
"fmt"
"github.com/kardianos/service"
_ "golang.org/x/tools/go/ssa"
"log"
"os"
"runtime"
"sync"
)
var (
logger service.Logger
loggerLock sync.Mutex
svcFlag *string
portFlag *int
)
func logInfof(format string, a ...interface{}) error {
loggerLock.Lock()
defer loggerLock.Unlock()
if logger != nil {
return logger.Infof(format, a...)
}
return nil
}
func logError(v ...interface{}) error {
loggerLock.Lock()
defer loggerLock.Unlock()
if logger != nil {
return logger.Error(v)
}
return nil
}
// Program structures.
// Define Start and Stop methods.
type program struct {
exit chan struct{}
}
func (p *program) Start(s service.Service) error {
if service.Interactive() {
logInfof("Service \"%s\" is running in terminal.", serviceDisplayName())
} else {
logInfof("Service \"%s\" is running under service manager.", serviceDisplayName())
}
p.exit = make(chan struct{})
// Start should not block. Do the actual work async.
go p.run()
return nil
}
func (p *program) run() {
start()
logInfof("Service \"%s\" is started.", serviceDisplayName())
for {
select {
case <-p.exit:
return
}
}
}
func (p *program) Stop(s service.Service) error {
// Any work in Stop should be quick, usually a few seconds at most.
logInfof("Service \"%s\" is stopped.", serviceDisplayName())
close(p.exit)
return nil
}
// Service setup.
// Define service config.
// Create the service.
// Setup the logger.
// Handle service controls (optional).
// Run the service.
func main() {
runtime.GOMAXPROCS(runtime.NumCPU())
flag.Usage = usage
svcFlag = flag.String("service", "", fmt.Sprintf("Control the system service. Valid actions: %q\n", service.ControlAction))
portFlag = flag.Int("port", 17000, " Port number")
flag.Parse()
if *portFlag == 0 {
usage()
os.Exit(2)
}
svcConfig := &service.Config{
Name: serviceName(),
DisplayName: serviceDisplayName(),
Description: serviceDisplayName(),
Arguments: []string{fmt.Sprintf("-port=%d", *portFlag)},
}
prg := &program{}
s, err := service.New(prg, svcConfig)
if err != nil {
log.Fatal(err)
}
errs := make(chan error, 5)
func() {
loggerLock.Lock()
defer loggerLock.Unlock()
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 {
logError(err)
}
}
func serviceName() string {
return fmt.Sprintf("ipdf_%d", *portFlag)
}
func serviceDisplayName() string {
return fmt.Sprintf("Internet/Intranet HTML to Pdf Converter (Port = %d)", *portFlag)
}
const usageTemplate = `ipdf is Internet/Intranet HTML to Pdf Converter
Usage: ipdf commands
The commands are:
`
func usage() {
fmt.Fprintln(os.Stderr, usageTemplate)
flag.PrintDefaults()
}