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server.go
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server.go
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package main
import (
"embed"
"flag"
"fmt"
"log"
"net/http"
"sync"
"github.com/olahol/melody"
)
var (
//go:embed jsnes/source/*.js
jsnesSourceDir embed.FS
//go:embed jsnes/lib/*.js
jsnesLibDir embed.FS
//go:embed index.html
indexHTML []byte
)
func main() {
port := flag.Int("p", 5000, "port to listen on")
flag.Parse()
rom := flag.Arg(0)
if rom == "" {
log.Fatalln("no rom file")
}
http.Handle("/jsnes/source/", http.FileServer(http.FS(jsnesSourceDir)))
http.Handle("/jsnes/lib/", http.FileServer(http.FS(jsnesLibDir)))
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
w.Write(indexHTML)
})
http.HandleFunc("/rom", func(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, rom)
})
m := melody.New()
m.Upgrader.ReadBufferSize = 65536
m.Upgrader.WriteBufferSize = 65536
m.Config.MaxMessageSize = 65536
m.Config.MessageBufferSize = 2048
http.HandleFunc("/ws", func(w http.ResponseWriter, r *http.Request) {
m.HandleRequest(w, r)
})
var mutex sync.Mutex
pairs := make(map[*melody.Session]*melody.Session)
m.HandleConnect(func(s *melody.Session) {
log.Println("connect")
mutex.Lock()
var partner *melody.Session
for player1, player2 := range pairs {
if player2 == nil {
partner = player1
pairs[partner] = s
log.Println("start")
partner.Write([]byte("join 1"))
s.Write([]byte("join 2"))
break
}
}
pairs[s] = partner
mutex.Unlock()
})
m.HandleDisconnect(func(s *melody.Session) {
log.Println("disconnect")
mutex.Lock()
partner := pairs[s]
if partner != nil {
pairs[partner] = nil
log.Println("stop")
partner.Write([]byte("part"))
}
delete(pairs, s)
mutex.Unlock()
})
relay := func(fn func(*melody.Session, []byte) error) func(*melody.Session, []byte) {
return func(s *melody.Session, msg []byte) {
partner := pairs[s]
if partner != nil {
fn(partner, msg)
}
}
}
m.HandleMessage(relay((*melody.Session).Write))
m.HandleMessageBinary(relay((*melody.Session).WriteBinary))
log.Printf("listening on http://localhost:%d", *port)
http.ListenAndServe(fmt.Sprint(":", *port), nil)
}