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@@ -0,0 +1,192 @@
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+package main
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+
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+import (
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+ "bytes"
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+ "excalidraw-backend/core"
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+ "excalidraw-backend/documents/memory"
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+ "fmt"
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+ "io"
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+ "net/http"
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+ "os"
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+ "os/signal"
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+ "syscall"
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+
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+ "github.com/go-chi/chi/v5"
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+ "github.com/go-chi/chi/v5/middleware"
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+ "github.com/go-chi/cors"
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+ "github.com/go-chi/render"
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+ "github.com/oklog/ulid/v2"
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+ "github.com/zishang520/engine.io/v2/types"
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+ socketio "github.com/zishang520/socket.io/v2/socket"
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+)
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+
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+type (
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+ DocumentCreateResponse struct {
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+ ID string `json:"id"`
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+ }
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+
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+ UserToFollow struct {
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+ SocketId string
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+ Username string
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+ }
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+ OnUserFollowedPayload struct {
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+ UserToFollow UserToFollow
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+ action string
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+ }
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+)
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+
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+func main() {
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+ opts := socketio.DefaultServerOptions()
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+ opts.SetMaxHttpBufferSize(5000000)
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+ opts.SetPath("/socket.io")
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+ opts.SetAllowEIO3(true)
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+ opts.SetCors(&types.Cors{
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+ Origin: "*",
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+ Credentials: true,
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+ })
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+ ioo := socketio.NewServer(nil, opts)
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+ ioo.On("connection", func(clients ...any) {
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+ socket := clients[0].(*socketio.Socket)
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+ ioo.To(socketio.Room(socket.Id())).Emit("init-room")
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+ me := socket.Id()
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+ socket.On("join-room", func(datas ...any) {
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+ room := socketio.Room(datas[0].(string))
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+ fmt.Printf("Socket %v has joined %v\n", me, room)
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+ socket.Join(room)
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+ ioo.In(room).FetchSockets()(func(sockets []*socketio.RemoteSocket, _ error) {
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+
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+ if len(sockets) <= 1 {
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+ ioo.To(socketio.Room(socket.Id())).Emit("first-in-room")
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+ } else {
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+ fmt.Printf("emit new user %v in room %v\n", me, room)
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+ socket.Broadcast().To(room).Emit("new-user", me)
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+ }
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+
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+ data := []socketio.SocketId{}
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+ for _, osocket := range sockets {
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+ data = append(data, osocket.Id())
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+ }
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+ fmt.Printf(" room %v has users %v\n", room, data)
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+
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+ ioo.In(room).Emit(
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+ "room-user-change",
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+ data,
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+ )
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+
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+ })
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+ })
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+ socket.On("server-broadcast", func(datas ...any) {
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+ roomID := datas[0].(string)
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+ fmt.Printf(" user %v sends update to room %v\n", me, roomID)
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+ socket.Broadcast().To(socketio.Room(roomID)).Emit("client-broadcast", datas[1], datas[2])
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+ })
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+ socket.On("server-volatile-broadcast", func(datas ...any) {
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+ roomID := datas[0].(string)
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+ fmt.Printf(" user %v sends volatile update to room %v\n", me, roomID)
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+ socket.Volatile().Broadcast().To(socketio.Room(roomID)).Emit("client-broadcast", datas[1], datas[2])
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+ })
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+
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+ socket.On("user-follow", func(datas ...any) {
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+ // TODO()
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+
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+ })
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+ socket.On("disconnecting", func(datas ...any) {
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+ for _, oroom := range socket.Rooms().Keys() {
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+ ioo.In(oroom).FetchSockets()(func(sockets []*socketio.RemoteSocket, _ error) {
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+ otherClients := []socketio.SocketId{}
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+ fmt.Printf("disconnecting %v from room %v", me, oroom)
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+ for _, osocket := range sockets {
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+ if osocket.Id() != me {
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+ otherClients = append(otherClients, osocket.Id())
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+ fmt.Println("other", osocket.Id())
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+ }
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+ }
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+ if len(otherClients) > 0 {
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+ ioo.In(oroom).Emit(
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+ "room-user-change",
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+ otherClients,
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+ )
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+
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+ }
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+
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+ })
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+
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+ }
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+
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+ })
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+ socket.On("disconnect", func(datas ...any) {
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+ socket.RemoveAllListeners("")
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+ socket.Disconnect(true)
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+ })
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+ })
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+
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+ r := chi.NewRouter()
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+ r.Use(middleware.Logger)
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+
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+ r.Use(cors.Handler(cors.Options{
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+ AllowedOrigins: []string{"https://*", "http://*"},
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+ AllowedMethods: []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
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+ AllowedHeaders: []string{"Accept", "Authorization", "Content-Type", "Content-Length", "X-CSRF-Token", "Token", "session", "Origin", "Host", "Connection", "Accept-Encoding", "Accept-Language", "X-Requested-With"},
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+ AllowCredentials: true,
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+ MaxAge: 300, // Maximum value not ignored by any of major browsers
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+ }))
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+
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+ documentStore := memory.NewDocumentStore()
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+
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+ r.Get("/", func(w http.ResponseWriter, r *http.Request) {
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+ w.Write([]byte("you are all set"))
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+ fmt.Println(ulid.Make())
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+ render.Status(r, http.StatusOK)
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+ })
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+
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+ r.Route("/api/v2", func(r chi.Router) {
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+ r.Post("/post/", func(w http.ResponseWriter, r *http.Request) {
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+ data := new(bytes.Buffer)
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+ _, err := io.Copy(data, r.Body)
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+ if err != nil {
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+ http.Error(w, "Failed to copy", http.StatusInternalServerError)
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+ return
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+ }
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+ id, err := documentStore.Create(r.Context(), &core.Document{Data: *data})
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+ if err != nil {
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+ http.Error(w, "Failed to save", http.StatusInternalServerError)
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+ return
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+ }
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+
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+ render.JSON(w, r, DocumentCreateResponse{ID: id})
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+ render.Status(r, http.StatusOK)
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+ })
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+ r.Route("/{id}", func(r chi.Router) {
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+ r.Get("/", func(w http.ResponseWriter, r *http.Request) {
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+ id := chi.URLParam(r, "id")
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+ document, err := documentStore.FindID(r.Context(), id)
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+ if err != nil {
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+ http.Error(w, "not found", http.StatusNotFound)
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+ return
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+ }
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+ w.Write(document.Data.Bytes())
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+ })
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+ })
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+ })
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+
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+ r.Handle("/socket.io/", ioo.ServeHandler(nil))
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+ go http.ListenAndServe(":3002", r)
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+
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+ exit := make(chan struct{})
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+ SignalC := make(chan os.Signal)
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+
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+ signal.Notify(SignalC, os.Interrupt, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
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+ go func() {
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+ for s := range SignalC {
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+ switch s {
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+ case os.Interrupt, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT:
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+ close(exit)
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+ return
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+ }
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+ }
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+ }()
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+
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+ <-exit
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+ ioo.Close(nil)
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+ os.Exit(0)
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+}
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