ECS

cmd/lastmudserver/main.go

@@ -7,6 +7,7 @@ import (
 	"os/signal"
 	"sync"
 	"syscall"
+	"time"
 
 	"code.haedhutner.dev/mvv/LastMUD/internal/server"
 
@@ -57,5 +58,7 @@ func processInput() {
 		if buf[0] == 'q' {
 			return
 		}
+
+		time.Sleep(50 * time.Millisecond)
 	}
 }

internal/game/db/repository.go

@@ -0,0 +1,17 @@
+package db
+
+import "github.com/google/uuid"
+
+type Identifier = uuid.UUID
+
+type Entity interface {
+	Id() Identifier
+}
+
+type Repository[T Entity] interface {
+	Create(entity T) (rowsAffected int, err error)
+	Delete(entity T) (rowsAffected int, err error)
+	Update(entity T) (rowsAffected int, err error)
+	FetchOne(id Identifier) (entity T, err error)
+	FetchAll() (entities []T, err error)
+}

internal/game/ecs/components.go

@@ -0,0 +1,31 @@
+package ecs
+
+type PlayerState = byte
+
+const (
+	PlayerStateJoining PlayerState = iota
+	PlayerStateLoggingIn
+	PlayerStateRegistering
+	PlayerStatePlaying
+	PlayerStateLeaving
+)
+
+type PlayerStateComponent struct {
+	State PlayerState
+}
+
+type NameComponent struct {
+	Name string
+}
+
+type DescriptionComponent struct {
+	Description string
+}
+
+type InRoomComponent struct {
+	InRoom Entity
+}
+
+type NeighboringRoomsComponent struct {
+	North, South, East, West Entity
+}

internal/game/ecs/entity.go

@@ -0,0 +1,19 @@
+package ecs
+
+import "github.com/google/uuid"
+
+type Entity uuid.UUID
+
+type Room struct {
+	Entity
+	NameComponent
+	DescriptionComponent
+	NeighboringRoomsComponent
+}
+
+type Player struct {
+	Entity
+	PlayerStateComponent
+	NameComponent
+	InRoomComponent
+}

internal/game/ecs/systems.go

@@ -0,0 +1 @@
+package ecs

internal/game/ecs/world.go

@@ -0,0 +1,15 @@
+package ecs
+
+type World struct {
+	Players     []*Player
+	Rooms       []*Room
+	DefaultRoom *Room
+}
+
+func CreateWorld() *World {
+	world := &World{
+		Players: []*Player{},
+		Rooms:   []*Room{},
+	}
+
+}

internal/game/event.go

@@ -45,9 +45,9 @@ type EventBus struct {
 	events chan GameEvent
 }
 
-func CreateEventBus() *EventBus {
+func CreateEventBus(capacity int) *EventBus {
 	return &EventBus{
-		events: make(chan GameEvent, 10),
+		events: make(chan GameEvent, capacity),
 	}
 }
 

internal/game/events.go

@@ -23,8 +23,10 @@ func (pje *PlayerJoinEvent) Type() EventType {
 }
 
 func (pje *PlayerJoinEvent) Handle(game *LastMUDGame, delta time.Duration) {
-	game.world.AddPlayerToDefaultRoom(CreatePlayer(pje.connectionId, nil))
-	game.enqeueOutput(game.CreateOutput(pje.connectionId, []byte("Welcome to LastMUD!")))
+	p := CreateJoiningPlayer(pje.connectionId)
+	game.world.AddPlayerToDefaultRoom(p)
+	game.enqeueOutput(game.CreateOutput(p.Identity(), []byte("Welcome to LastMUD!")))
+	game.enqeueOutput(game.CreateOutput(p.Identity(), []byte("Please enter your name:")))
 }
 
 type PlayerLeaveEvent struct {
@@ -51,7 +53,7 @@ type PlayerCommandEvent struct {
 }
 
 func (game *LastMUDGame) CreatePlayerCommandEvent(connId uuid.UUID, cmdString string) (event *PlayerCommandEvent, err error) {
-	cmdCtx, err := command.CreateCommandContext(game.CommandRegistry(), cmdString)
+	cmdCtx, err := command.CreateCommandContext(game.commandRegistry(), cmdString)
 
 	if err != nil {
 		return nil, err
@@ -77,17 +79,23 @@ func (pce *PlayerCommandEvent) Handle(game *LastMUDGame, delta time.Duration) {
 		return
 	}
 
+	event := pce.parseCommandIntoEvent(game, player)
+}
+
+func (pce *PlayerCommandEvent) parseCommandIntoEvent(game *LastMUDGame, player *Player) GameEvent {
 	switch pce.command.Command().Definition().Name() {
 	case SayCommand:
 		speech, err := pce.command.Command().Parameters()[0].AsString()
 
 		if err != nil {
 			logging.Error("Unable to handle player speech from player with id", pce.connectionId, ": Speech could not be parsed: ", err.Error())
-			return
+			return nil
 		}
 
-		game.EnqueueEvent(game.CreatePlayerSayEvent(player, speech))
+		return game.CreatePlayerSayEvent(player, speech)
 	}
+
+	return nil
 }
 
 type PlayerSayEvent struct {

internal/game/game.go

@@ -12,6 +12,9 @@ import (
 
 const TickRate = time.Duration(50 * time.Millisecond)
 
+const MaxEnqueuedOutputPerTick = 100
+const MaxEnqueuedGameEventsPerTick = 100
+
 type GameOutput struct {
 	connId   uuid.UUID
 	contents []byte
@@ -36,8 +39,9 @@ type LastMUDGame struct {
 	ctx context.Context
 	wg  *sync.WaitGroup
 
-	commandRegistry *command.CommandRegistry
-	world           *World
+	cmdRegistry *command.CommandRegistry
+
+	world *World
 
 	eventBus *EventBus
 
@@ -48,12 +52,12 @@ func CreateGame(ctx context.Context, wg *sync.WaitGroup) (game *LastMUDGame) {
 	game = &LastMUDGame{
 		wg:       wg,
 		ctx:      ctx,
-		eventBus: CreateEventBus(),
-		output:   make(chan GameOutput, 10),
+		eventBus: CreateEventBus(MaxEnqueuedGameEventsPerTick),
+		output:   make(chan GameOutput, MaxEnqueuedOutputPerTick),
 		world:    CreateWorld(),
 	}
 
-	game.commandRegistry = game.CreateGameCommandRegistry()
+	game.cmdRegistry = game.CreateGameCommandRegistry()
 
 	wg.Add(1)
 	go game.start()
@@ -61,6 +65,23 @@ func CreateGame(ctx context.Context, wg *sync.WaitGroup) (game *LastMUDGame) {
 	return
 }
 
+func (game *LastMUDGame) EnqueueEvent(event GameEvent) {
+	game.eventBus.Push(event)
+}
+
+func (game *LastMUDGame) ConsumeNextOutput() *GameOutput {
+	select {
+	case output := <-game.output:
+		return &output
+	default:
+		return nil
+	}
+}
+
+func (game *LastMUDGame) commandRegistry() *command.CommandRegistry {
+	return game.cmdRegistry
+}
+
 func (game *LastMUDGame) start() {
 	defer game.wg.Done()
 	defer game.shutdown()
@@ -102,27 +123,10 @@ func (game *LastMUDGame) shouldStop() bool {
 	}
 }
 
-func (game *LastMUDGame) EnqueueEvent(event GameEvent) {
-	game.eventBus.Push(event)
-}
-
 func (game *LastMUDGame) enqeueOutput(output GameOutput) {
 	game.output <- output
 }
 
-func (game *LastMUDGame) ConsumeNextOutput() *GameOutput {
-	select {
-	case output := <-game.output:
-		return &output
-	default:
-		return nil
-	}
-}
-
-func (game *LastMUDGame) CommandRegistry() *command.CommandRegistry {
-	return game.commandRegistry
-}
-
 func (g *LastMUDGame) tick(delta time.Duration) {
 	for {
 		event := g.eventBus.Pop()

internal/game/player.go

@@ -5,12 +5,23 @@ import "github.com/google/uuid"
 type Player struct {
 	id uuid.UUID
 
+	state PlayerState
+
 	currentRoom *Room
 }
 
-func CreatePlayer(identity uuid.UUID, room *Room) *Player {
+func CreateJoiningPlayer(identity uuid.UUID) *Player {
 	return &Player{
 		id:          identity,
+		state:       PlayerStateJoining,
+		currentRoom: nil,
+	}
+}
+
+func CreatePlayer(identity uuid.UUID, state PlayerState, room *Room) *Player {
+	return &Player{
+		id:          identity,
+		state:       state,
 		currentRoom: room,
 	}
 }

internal/game/traits.go

@@ -1 +0,0 @@
-package game

internal/server/connection.go

@@ -11,7 +11,11 @@ import (
 	"github.com/google/uuid"
 )
 
-const MaxLastSeenTime = 120 * time.Second
+const MaxLastSeenTime = 90 * time.Second
+
+const CheckAlivePeriod = 50 * time.Millisecond
+
+const DeleteBeforeAndMoveToStartOfLine = "\033[1K\r"
 
 type Connection struct {
 	ctx context.Context
@@ -53,6 +57,13 @@ func (c *Connection) Id() uuid.UUID {
 	return c.identity
 }
 
+func (c *Connection) Write(output []byte) (err error) {
+	output = append([]byte(DeleteBeforeAndMoveToStartOfLine+"< "), output...)
+	output = append(output, []byte("\n> ")...)
+	_, err = c.conn.Write(output)
+	return
+}
+
 func (c *Connection) listen() {
 	defer c.wg.Done()
 
@@ -100,6 +111,8 @@ func (c *Connection) checkAlive() {
 		if err != nil {
 			break
 		}
+
+		time.Sleep(CheckAlivePeriod)
 	}
 }
 
@@ -119,10 +132,3 @@ func (c *Connection) closeConnection() {
 
 	logging.Info("Disconnected: ", c.conn.RemoteAddr())
 }
-
-func (c *Connection) Write(output []byte) (err error) {
-	output = append([]byte("< "), output...)
-	output = append(output, []byte("\n> ")...)
-	_, err = c.conn.Write(output)
-	return
-}

internal/server/error.go

@@ -1,15 +0,0 @@
-package server
-
-type inputEmptyError struct {
-	msg string
-}
-
-func newInputEmptyError() *inputEmptyError {
-	return &inputEmptyError{
-		msg: "No input available at this moment",
-	}
-}
-
-func (err *inputEmptyError) Error() string {
-	return err.msg
-}