Support Windows service with go-svc
parent
bba0bb6613
commit
f6449feb55
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@ -0,0 +1,6 @@
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module "github.com/productionwentdown/forward"
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require (
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"github.com/judwhite/go-svc" v1.0.0
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"golang.org/x/sys" v0.0.0-20180322165403-91ee8cde4354
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)
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100
main.go
100
main.go
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@ -1,68 +1,66 @@
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package main
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import (
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"flag"
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"io"
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"log"
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"net"
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"os"
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"path/filepath"
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"sync"
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"github.com/judwhite/go-svc/svc"
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)
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var listen string
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var connect string
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type program struct {
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logFile *os.File
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wg sync.WaitGroup
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}
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func main() {
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flag.StringVar(&listen, "listen", ":8000", "listen on ip and port")
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flag.StringVar(&connect, "connect", "", "forward to ip and port")
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flag.Parse()
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prg := &program{}
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// check and parse address
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conn, err := net.ResolveTCPAddr("tcp", connect)
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if err != nil {
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flag.PrintDefaults()
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if err := svc.Run(prg); err != nil {
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log.Fatal(err)
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}
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// listen on address
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ln, err := net.Listen("tcp", listen)
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if err != nil {
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flag.PrintDefaults()
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log.Fatal(err)
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}
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log.Printf("listening on %v", ln.Addr())
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log.Printf("will connect to %v", conn)
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for i := 0; ; i++ {
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// accept new connection
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c, err := ln.Accept()
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if err != nil {
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log.Fatal(err)
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}
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log.Printf("connection %v from %v", i, c.RemoteAddr())
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cn, err := net.DialTCP("tcp", nil, conn)
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if err != nil {
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c.Close()
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log.Print(err)
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continue
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}
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go pipe(c, cn, i)
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go pipe(cn, c, i)
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}
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}
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func pipe(w io.WriteCloser, r io.ReadCloser, count int) {
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n, err := io.Copy(w, r)
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func (p *program) Init(env svc.Environment) error {
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if env.IsWindowsService() {
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dir, err := filepath.Abs(filepath.Dir(os.Args[0]))
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if err != nil {
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return err
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}
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logPath := filepath.Join(dir, "forward.log")
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r.Close()
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w.Close()
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f, err := os.OpenFile(logPath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
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if err != nil {
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return err
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}
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log.Printf("connection %v closed, %v bytes", count, n)
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opError, ok := err.(*net.OpError)
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if err != nil && (!ok || opError.Op != "readfrom") {
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log.Printf("warning! %v", err)
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p.logFile = f
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log.SetOutput(f)
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}
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setup()
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return nil
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}
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func (p *program) Start() error {
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p.wg.Add(1)
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go func() {
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serve()
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p.wg.Done()
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}()
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log.Print("started")
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return nil
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}
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func (p *program) Stop() error {
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log.Print("stopping...")
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ln.Close()
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p.wg.Wait()
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log.Print("stopped")
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return nil
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}
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@ -0,0 +1,76 @@
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package main
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import (
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"flag"
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"io"
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"log"
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"net"
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)
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var listen string
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var connect string
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var ln net.Listener
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var conn *net.TCPAddr
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func setup() {
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flag.StringVar(&listen, "listen", ":8000", "listen on ip and port")
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flag.StringVar(&connect, "connect", "", "forward to ip and port")
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flag.Parse()
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var err error
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// check and parse address
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conn, err = net.ResolveTCPAddr("tcp", connect)
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if err != nil {
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flag.PrintDefaults()
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log.Fatal(err)
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}
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// listen on address
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ln, err = net.Listen("tcp", listen)
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if err != nil {
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flag.PrintDefaults()
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log.Fatal(err)
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}
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log.Printf("listening on %v", ln.Addr())
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log.Printf("will connect to %v", conn)
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}
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func serve() {
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for i := 0; ; i++ {
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// accept new connection
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c, err := ln.Accept()
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if err != nil {
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log.Print(err)
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break
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}
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log.Printf("connection %v from %v", i, c.RemoteAddr())
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cn, err := net.DialTCP("tcp", nil, conn)
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if err != nil {
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c.Close()
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log.Print(err)
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continue
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}
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go pipe(c, cn, i)
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go pipe(cn, c, i)
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}
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}
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func pipe(w io.WriteCloser, r io.ReadCloser, count int) {
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n, err := io.Copy(w, r)
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r.Close()
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w.Close()
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log.Printf("connection %v closed, %v bytes", count, n)
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opError, ok := err.(*net.OpError)
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if err != nil && (!ok || opError.Op != "readfrom") {
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log.Printf("warning! %v", err)
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}
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}
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