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server.go
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server.go
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package main
import (
"errors"
"fmt"
"io"
"os"
ma "github.com/ipsn/go-ipfs/gxlibs/github.com/multiformats/go-multiaddr"
manet "github.com/ipsn/go-ipfs/gxlibs/github.com/multiformats/go-multiaddr-net"
)
var usageText = `usage: %s <multiaddr>
Listen for incoming connections on <multiaddr>, and print when
we have received any. Don't write, or close them.
`
func hang(i int, c manet.Conn) {
buf := make([]byte, 1024)
for {
_, err := c.Read(buf)
if err == io.EOF {
fmt.Printf("conn %d closed from %s\n", i, c.RemoteMultiaddr())
return
}
if err != nil {
fmt.Printf("conn %d read failed: %s\n", i, err)
return
}
}
}
func listenAndHang(a ma.Multiaddr) error {
l, err := manet.Listen(a)
if err != nil {
return err
}
fmt.Printf("listening at %s\n", a)
for i := 0; ; i++ {
i := i
c, err := l.Accept()
if err != nil {
return err
}
fmt.Printf("conn %d accepted from %s\n", i, c.RemoteMultiaddr())
go hang(i, c)
}
}
func run(args []string) error {
m, err := ma.NewMultiaddr(args[0])
if err != nil {
return errors.New("<multiaddr> argument must be a valid multiaddr")
}
return listenAndHang(m)
}
func main() {
usageAndExit := func(code int) {
p := os.Args[0]
fmt.Printf(usageText, p)
os.Exit(code)
}
for _, arg := range os.Args {
if arg == "-h" || arg == "--help" {
usageAndExit(0)
return
}
}
if len(os.Args) != 2 {
usageAndExit(-1)
return
}
if err := run(os.Args[1:]); err != nil {
fmt.Fprintf(os.Stderr, "error: %s\n", err)
os.Exit(-1)
}
}