track player's last access time

server/src/application/application.go

@@ -22,5 +22,7 @@ func NewApplication(config applicationConfig.ApplicationConfig) (*Application, e
 		return nil, err
 	}
 
+	go app.expireInactivePlayersThread()
+
 	return &app, nil
 }

server/src/application/expireInactivePlayers.go

@@ -0,0 +1,35 @@
+package application
+
+import (
+	"fmt"
+	"time"
+)
+
+func (app *Application) expireInactivePlayersThread() {
+	for {
+		time.Sleep(5 * time.Second)
+
+		removedIds := app.expireInactivePlayers()
+		for _, usrId := range removedIds {
+			fmt.Printf("expired %s\n", usrId)
+		}
+	}
+}
+
+func (app *Application) expireInactivePlayers() []string {
+	now := time.Now()
+	removedIds := make([]string, 0)
+
+	app.mu.Lock()
+	defer app.mu.Unlock()
+
+	for usrId, atime := range app.playerATime {
+		elapsed := now.Sub(atime)
+		if elapsed.Seconds() > 10 {
+			delete(app.playerATime, usrId)
+			removedIds = append(removedIds, usrId)
+		}
+	}
+
+	return removedIds
+}

server/src/application/playerATime.go

@@ -10,7 +10,22 @@ func (app *Application) updatePlayerATime(usr *user.User) {
 	usrId := usr.GetId()
 
 	app.mu.Lock()
-	fmt.Printf("updatePlayerATime \"%v\"\n", app.playerATime[usrId])
+	prevTime := app.playerATime[usrId]
+	if prevTime.IsZero() {
+		fmt.Printf("new Player %s\n", usr.GetName())
+	}
 	app.playerATime[usrId] = time.Now()
 	app.mu.Unlock()
 }
+
+func (app *Application) getActivePlayerIds() []string {
+	app.mu.Lock()
+	defer app.mu.Unlock()
+
+	playerIds := make([]string, 0)
+	for usrId, _ := range app.playerATime {
+		playerIds = append(playerIds, usrId)
+	}
+
+	return playerIds
+}