add player package with key client-side player functionality, update protocol codecs, and refactor metadata definitions and slot usage

pkg/client/handler.go

@@ -0,0 +1,42 @@
+package client
+
+import (
+	"context"
+
+	"git.konjactw.dev/patyhank/minego/pkg/bot"
+	"git.konjactw.dev/patyhank/minego/pkg/protocol/packet/game/client"
+	"github.com/Tnze/go-mc/data/packetid"
+)
+
+func newPacketHandler() bot.PacketHandler {
+	return &packetHandler{
+		handlerMap: make(map[packetid.ClientboundPacketID][]func(ctx context.Context, p client.ClientboundPacket)),
+	}
+}
+
+type packetHandler struct {
+	handlerMap map[packetid.ClientboundPacketID][]func(ctx context.Context, p client.ClientboundPacket)
+	genericMap []func(ctx context.Context, p client.ClientboundPacket)
+}
+
+func (ph *packetHandler) AddPacketHandler(id packetid.ClientboundPacketID, handler func(ctx context.Context, p client.ClientboundPacket)) {
+	f := ph.handlerMap[id]
+	f = append(f, handler)
+	ph.handlerMap[id] = f
+}
+
+func (ph *packetHandler) AddGenericPacketHandler(handler func(ctx context.Context, p client.ClientboundPacket)) {
+	ph.genericMap = append(ph.genericMap, handler)
+}
+
+func (ph *packetHandler) HandlePacket(ctx context.Context, p client.ClientboundPacket) {
+	f := ph.handlerMap[p.PacketID()]
+	if f != nil {
+		for _, handler := range f {
+			handler(ctx, p)
+		}
+	}
+	for _, handler := range ph.genericMap {
+		handler(ctx, p)
+	}
+}