initial spectator implementation

game.go

@@ -14,6 +14,9 @@ type game struct {
 	unregister  chan *player
 	id          chan int
 	turn        int
+	spectators  map[*Spectator]bool
+	sregister    chan *Spectator
+	sunregister  chan *Spectator
 }
 
 type Config struct {
@@ -55,6 +58,12 @@ func (g *game) run() {
 		case p := <-g.unregister:
 			delete(g.players, p)
 			close(p.send)
+		case s := <-g.sregister:
+			log.Printf("registering a spectator: %+v", s)
+			g.spectators[s] = true
+		case s := <-g.sunregister:
+			delete(g.spectators, s)
+			close(s.send)
 		case <-time.Tick(time.Duration(*tick) * time.Millisecond):
 			g.turn++
 			t0 := time.Now()
@@ -111,6 +120,9 @@ func (g *game) run() {
 			for p := range g.players {
 				p.send <- payload
 			}
+			for s := range g.spectators {
+				s.send <- payload
+			}
 
 			t1 = time.Now()
 			if *verbose {