wshub.go

package main

import (
	"fmt"
	"time"

	"github.com/gorilla/websocket"
	"github.com/zignig/cohort/world"
)

// player hub
type hub struct {
	// Registered connections.
	connections map[*connection]bool

	// Inbound messages from the connections.
	broadcast chan []byte

	// Register requests from the connections.
	register chan *connection

	// Unregister requests from connections.
	unregister chan *connection

	world *world.World
}

// readPump pumps messages from the websocket connection to the hub.
func (c *connection) readPump() {
	defer func() {
		u.h.unregister <- c
		c.ws.Close()
	}()
	//
	c.ws.SetReadLimit(maxMessageSize)
	c.ws.SetReadDeadline(time.Now().Add(pongWait))
	c.ws.SetPongHandler(func(string) error { c.ws.SetReadDeadline(time.Now().Add(pongWait)); return nil })
	for {
		_, message, err := c.ws.ReadMessage()
		if err != nil {
			break
		}
		// push the data into the player object
		c.play.InMess <- message
		//h.broadcast <- message
	}
}

// write writes a message with the given message type and payload.
func (c *connection) write(mt int, payload []byte) error {
	c.ws.SetWriteDeadline(time.Now().Add(writeWait))
	return c.ws.WriteMessage(mt, payload)
}

const (
	// Time allowed to write a message to the peer.
	writeWait = 10 * time.Second

	// Time allowed to read the next pong message from the peer.
	pongWait = 60 * time.Second

	// Send pings to peer with this period. Must be less than pongWait.
	pingPeriod = (pongWait * 9) / 10

	// Maximum message size allowed from peer.
	maxMessageSize = 512
)

// writePump pumps messages from the hub to the websocket connection.
func (c *connection) writePump() {
	ticker := time.NewTicker(pingPeriod)
	defer func() {
		ticker.Stop()
		c.ws.Close()
	}()
	for {
		select {
		case message := <-c.play.OutMess:
			if err := c.write(websocket.TextMessage, message); err != nil {
				return
			}
		case message, ok := <-c.send:
			if !ok {
				c.write(websocket.CloseMessage, []byte{})
				return
			}
			if err := c.write(websocket.TextMessage, message); err != nil {
				return
			}
		case <-ticker.C:
			if err := c.write(websocket.PingMessage, []byte{}); err != nil {
				return
			}
		}
	}
}

// lifted from  The Gorilla WebSocket Authors. All rights reserved.
type connection struct {
	// The websocket connection.
	ws   *websocket.Conn
	play *world.Player
	// Buffered channel of outbound messages.
	send chan []byte
}

func NewConnection(h *hub, conn *websocket.Conn) (c *connection) {
	c = &connection{send: make(chan []byte, 256), ws: conn}
	newPlayer := h.world.NewPlayer()
	c.play = newPlayer
	// start the player gorouting
	go newPlayer.Run()
	return c
}

func NewHub(w *world.World) (h *hub) {
	h = &hub{}
	h.broadcast = make(chan []byte)
	h.register = make(chan *connection)
	h.unregister = make(chan *connection)
	h.connections = make(map[*connection]bool)
	h.world = w
	return h
}

func (h *hub) run() {
	for {
		select {
		case c := <-h.register:
			fmt.Println("new connection")
			h.connections[c] = true
			c.send <- []byte("load")

		case c := <-h.unregister:
			if _, ok := h.connections[c]; ok {
				c.play.Closer <- true
				delete(h.connections, c)
				close(c.send)
			}
			//case m := <-h.broadcast:
			//fmt.Println(string(m))
			//for c := range h.connections {
			//	select {
			//	case c.send <- m:
			//	default:
			//		close(c.send)
			//		delete(h.connections, c)
			//	}
			//}
		}
	}
}