bot can receive chunks now

bot/world/chunks.go

@@ -0,0 +1,66 @@
+package world
+
+import (
+	"github.com/Tnze/go-mc/bot"
+	"github.com/Tnze/go-mc/bot/basic"
+	"github.com/Tnze/go-mc/data/packetid"
+	"github.com/Tnze/go-mc/level"
+	pk "github.com/Tnze/go-mc/net/packet"
+)
+
+type World struct {
+	c      *bot.Client
+	p      *basic.Player
+	events EventsListener
+
+	Columns map[level.ChunkPos]*level.Chunk
+}
+
+func NewWorld(c *bot.Client, p *basic.Player, events EventsListener) (w *World) {
+	w = &World{
+		c: c, p: p,
+		events:  events,
+		Columns: make(map[level.ChunkPos]*level.Chunk),
+	}
+	c.Events.AddListener(
+		bot.PacketHandler{Priority: 64, ID: packetid.ClientboundLogin, F: w.onPlayerSpawn},
+		bot.PacketHandler{Priority: 64, ID: packetid.ClientboundRespawn, F: w.onPlayerSpawn},
+		bot.PacketHandler{Priority: 0, ID: packetid.ClientboundLevelChunkWithLight, F: w.handleLevelChunkWithLightPacket},
+		bot.PacketHandler{Priority: 0, ID: packetid.ClientboundForgetLevelChunk, F: w.handleForgetLevelChunkPacket},
+	)
+	return
+}
+
+func (w *World) onPlayerSpawn(pk.Packet) error {
+	// unload all chunks
+	w.Columns = make(map[level.ChunkPos]*level.Chunk)
+	return nil
+}
+
+func (w *World) handleLevelChunkWithLightPacket(packet pk.Packet) error {
+	var pos level.ChunkPos
+	chunk := level.EmptyChunk(int(w.p.WorldInfo.Dimension.Height / 16))
+	if err := packet.Scan(&pos, chunk); err != nil {
+		return err
+	}
+	w.Columns[pos] = chunk
+	if w.events.LoadChunk != nil {
+		if err := w.events.LoadChunk(pos); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (w *World) handleForgetLevelChunkPacket(packet pk.Packet) error {
+	var pos level.ChunkPos
+	if err := packet.Scan(&pos); err != nil {
+		return err
+	}
+	var err error
+	if w.events.UnloadChunk != nil {
+		err = w.events.UnloadChunk(pos)
+	}
+	delete(w.Columns, pos)
+	return err
+}

bot/world/events.go

@@ -0,0 +1,8 @@
+package world
+
+import "github.com/Tnze/go-mc/level"
+
+type EventsListener struct {
+	LoadChunk   func(pos level.ChunkPos) error
+	UnloadChunk func(pos level.ChunkPos) error
+}