|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "github.com/gorilla/websocket" |
| 6 | + "github.com/labstack/echo/v4" |
| 7 | + "github.com/labstack/echo/v4/middleware" |
| 8 | + "github.com/ndthuan/websocketserver" |
| 9 | + "math/rand" |
| 10 | + "time" |
| 11 | +) |
| 12 | + |
| 13 | +// This map is not thread safe, it's for demonstration purpose only. You should implement your own lock mechanism. |
| 14 | +var authenticatedConnections map[*websocket.Conn]string |
| 15 | + |
| 16 | +func init() { |
| 17 | + authenticatedConnections = make(map[*websocket.Conn]string) |
| 18 | +} |
| 19 | + |
| 20 | +func broadcast(msg string, excluded *websocket.Conn) { |
| 21 | + for conn := range authenticatedConnections { |
| 22 | + if conn == excluded { |
| 23 | + continue |
| 24 | + } |
| 25 | + _ = conn.WriteJSON(websocketserver.Message{ |
| 26 | + Type: "system-broadcast", |
| 27 | + Payload: msg, |
| 28 | + }) |
| 29 | + } |
| 30 | +} |
| 31 | + |
| 32 | +func loginHandler() websocketserver.MessageHandler { |
| 33 | + return func(connection *websocket.Conn, listener *websocketserver.Server, message websocketserver.Message) error { |
| 34 | + username := message.Payload |
| 35 | + |
| 36 | + authenticatedConnections[connection] = username |
| 37 | + |
| 38 | + broadcast(fmt.Sprintf("Everyone, please welcome %s to our chat room!", username), connection) |
| 39 | + |
| 40 | + return nil |
| 41 | + } |
| 42 | +} |
| 43 | + |
| 44 | +func logoutHandler() websocketserver.MessageHandler { |
| 45 | + return func(connection *websocket.Conn, listener *websocketserver.Server, message websocketserver.Message) error { |
| 46 | + username, loggedIn := authenticatedConnections[connection] |
| 47 | + |
| 48 | + if loggedIn { |
| 49 | + delete(authenticatedConnections, connection) |
| 50 | + broadcast(fmt.Sprintf("%s left the room", username), connection) |
| 51 | + _ = connection.WriteMessage(websocket.CloseMessage, []byte{}) |
| 52 | + } |
| 53 | + |
| 54 | + return nil |
| 55 | + } |
| 56 | +} |
| 57 | + |
| 58 | +func disconnectedCallback() websocketserver.ConnectionCallback { |
| 59 | + return func(connection *websocket.Conn, listener *websocketserver.Server) error { |
| 60 | + loggedInUser, already := authenticatedConnections[connection] |
| 61 | + if already { |
| 62 | + broadcast(fmt.Sprintf("%s disconnected", loggedInUser), connection) |
| 63 | + delete(authenticatedConnections, connection) |
| 64 | + } |
| 65 | + return nil |
| 66 | + } |
| 67 | +} |
| 68 | + |
| 69 | +func connectedCallback() websocketserver.ConnectionCallback { |
| 70 | + return func(connection *websocket.Conn, listener *websocketserver.Server) error { |
| 71 | + return connection.WriteJSON(websocketserver.Message{ |
| 72 | + Type: "system-message", |
| 73 | + Payload: "Hi there, this is private message to you. Welcome!", |
| 74 | + }) |
| 75 | + } |
| 76 | +} |
| 77 | + |
| 78 | +func humanMessageHandler() websocketserver.MessageHandler { |
| 79 | + return func(connection *websocket.Conn, listener *websocketserver.Server, message websocketserver.Message) error { |
| 80 | + username, ok := authenticatedConnections[connection] |
| 81 | + |
| 82 | + if ok { |
| 83 | + broadcast(fmt.Sprintf("%s: %s", username, message.Payload), connection) |
| 84 | + } |
| 85 | + |
| 86 | + return nil |
| 87 | + } |
| 88 | +} |
| 89 | + |
| 90 | +func standaloneRunner() websocketserver.StandaloneRunner { |
| 91 | + return func(server *websocketserver.Server) { |
| 92 | + for { |
| 93 | + time.Sleep(time.Duration(rand.Intn(10)) * time.Second) |
| 94 | + |
| 95 | + server.Broadcast(func(conn *websocket.Conn) (*websocketserver.Message, bool) { |
| 96 | + if username, loggedIn := authenticatedConnections[conn]; loggedIn { |
| 97 | + now, _ := time.Now().MarshalText() |
| 98 | + |
| 99 | + msg := &websocketserver.Message{ |
| 100 | + Type: "system-broadcast", |
| 101 | + Payload: fmt.Sprintf("Hi %s, now is %s, how are you?", username, now), |
| 102 | + } |
| 103 | + |
| 104 | + return msg, true |
| 105 | + } |
| 106 | + |
| 107 | + return nil, false |
| 108 | + }) |
| 109 | + } |
| 110 | + } |
| 111 | +} |
| 112 | + |
| 113 | +func main() { |
| 114 | + wsServer := websocketserver.Server{ |
| 115 | + Upgrader: websocket.Upgrader{}, |
| 116 | + } |
| 117 | + |
| 118 | + wsServer.OnConnected(connectedCallback()) |
| 119 | + wsServer.OnDisconnected(disconnectedCallback()) |
| 120 | + wsServer.SetStandaloneRunner(standaloneRunner()) |
| 121 | + wsServer.On("login", loginHandler()) |
| 122 | + wsServer.On("logout", logoutHandler()) |
| 123 | + wsServer.On("human-message", humanMessageHandler()) |
| 124 | + |
| 125 | + e := echo.New() |
| 126 | + e.Use(middleware.Logger()) |
| 127 | + e.GET("/ws", func(c echo.Context) error { |
| 128 | + return wsServer.Start(c.Response(), c.Request(), nil) |
| 129 | + }) |
| 130 | + |
| 131 | + e.Logger.Fatal(e.Start(":8989")) |
| 132 | +} |
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