entities tickingggg

internal/server/server.go

@@ -94,6 +94,7 @@ func (s *Server) createSession(conn *websocket.Conn) *session {
 	}
 	s.waitOnSessions.Add(1)
 	s.sessions[sn.id] = sn
+	sn.entityID = s.world.SpawnPlayer(sn.id)
 	s.Info("created session %d, %d sessions active", sn.id, len(s.sessions))
 	return sn
 }
@@ -106,6 +107,7 @@ func (s *Server) dropSession(sn *session) {
 
 	close(sn.done)
 	delete(s.sessions, sn.id)
+	s.world.DespawnPlayer(sn.entityID)
 	s.waitOnSessions.Add(-1)
 
 	s.Info("dropped session %d after %v time connected, %d sessions active", sn.id, time.Since(sn.start), len(s.sessions))
@@ -146,6 +148,7 @@ func (s *Server) Shutdown() {
 
 	go func() {
 		defer wg.Done()
+
 		log := s.Child("http")
 		log.Info("shutting down http server")
 		if err := s.http.Shutdown(context.Background()); err != nil {

internal/server/session.go

@@ -13,6 +13,7 @@ import (
 type session struct {
 	*blammo.Log
 	id       int
+	entityID int
 	start    time.Time
 	conn     *websocket.Conn
 	outbox   chan wire.Response

internal/sim/entity.go

@@ -4,6 +4,8 @@ import "time"
 
 // entity is any entity that can be simulated.
 type entity interface {
+	id() int
+
 	// update is the standard tick function
 	update(time.Duration)
 }

internal/sim/player.go

@@ -1,5 +1,20 @@
 package sim
 
+import (
+	"time"
+
+	"github.com/jordanorelli/blammo"
+)
+
 // player represents a player character in the simulation
 type player struct {
+	*blammo.Log
+	sessionID int
+	entityID  int
 }
+
+func (p *player) update(dt time.Duration) {
+	p.Info("tick")
+}
+
+func (p *player) id() int { return p.entityID }

internal/sim/room.go

@@ -1,7 +1,25 @@
 package sim
 
+import (
+	"time"
+
+	"github.com/jordanorelli/blammo"
+)
+
 type room struct {
+	*blammo.Log
+	name   string
 	origin point
 	width  int
 	height int
+	tiles  []tile
+}
+
+func (r *room) update(dt time.Duration) {
+	r.Info("updating room")
+	for _, t := range r.tiles {
+		for _, e := range t.contents {
+			e.update(dt)
+		}
+	}
 }

internal/sim/tile.go

@@ -1,6 +1,30 @@
 package sim
 
+// tile is an individual cell within the world simulation. Everything happens
+// on a tile.
 type tile struct {
+	// floor is the surface for the tile. All things sit atop the floor. The
+	// floor informs clients how to draw the tile in the event that the tile's
+	// contents are empty. The floor also determins whether or not the tile is
+	// traversable.
 	floor floor
-	contents []entity
+
+	// contents is all of the entities on this tile. A given tile may have many
+	// entities.
+	contents map[int]entity
+}
+
+func (t *tile) addEntity(e entity) {
+	if t.contents == nil {
+		t.contents = make(map[int]entity)
+	}
+	t.contents[e.id()] = e
+}
+
+func (t *tile) removeEntity(id int) entity {
+	if e, here := t.contents[id]; here {
+		delete(t.contents, id)
+		return e
+	}
+	return nil
 }

internal/sim/world.go

@@ -1,6 +1,7 @@
 package sim
 
 import (
+	"strconv"
 	"time"
 
 	"github.com/jordanorelli/blammo"
@@ -11,18 +12,21 @@ type World struct {
 	*blammo.Log
 	rooms        []room
 	done         chan bool
+	lastEntityID int
 }
 
 func NewWorld(log *blammo.Log) *World {
-	return &World{
-		Log: log,
-		rooms: []room{
-			room{
+	foyer := room{
+		Log:    log.Child("foyer"),
+		name:   "foyer",
 		origin: point{0, 0},
 		width:  10,
 		height: 10,
-			},
-		},
+		tiles:  make([]tile, 100),
+	}
+	return &World{
+		Log:   log,
+		rooms: []room{foyer},
 		done:  make(chan bool),
 	}
 }
@@ -51,6 +55,36 @@ func (w *World) Stop() error {
 	return nil
 }
 
+func (w *World) SpawnPlayer(id int) int {
+	w.lastEntityID++
+	r := w.rooms[0]
+	w.Info("spawning player with id: %d into room %q", id, r.name)
+	t := &r.tiles[0]
+	p := player{
+		Log:       w.Child("players").Child(strconv.Itoa(id)),
+		sessionID: id,
+		entityID:  w.lastEntityID,
+	}
+	t.addEntity(&p)
+	return p.entityID
+}
+
+func (w *World) DespawnPlayer(id int) {
+	w.Info("despawning player with id: %d", id)
+	for _, r := range w.rooms {
+		for _, t := range r.tiles {
+			if e := t.removeEntity(id); e != nil {
+				w.Info("player removed from room %q", r.name)
+				return
+			}
+		}
+	}
+	w.Error("player was not found in any room")
+}
+
 func (w *World) tick(d time.Duration) {
 	w.Info("tick. elapsed: %v", d)
+	for _, r := range w.rooms {
+		r.update(d)
+	}
 }