New server framework, an example, and compressed packet fixed.

examples/frameworkServer/main.go

@@ -0,0 +1,159 @@
+package main
+
+import (
+	"container/list"
+	_ "embed"
+	"log"
+	"sync"
+
+	"github.com/Tnze/go-mc/chat"
+	"github.com/Tnze/go-mc/data/packetid"
+	"github.com/Tnze/go-mc/nbt"
+	"github.com/Tnze/go-mc/net"
+	pk "github.com/Tnze/go-mc/net/packet"
+	"github.com/Tnze/go-mc/server"
+	"github.com/google/uuid"
+)
+
+type MyServer struct {
+	PlayerList     *list.List
+	PlayerListLock sync.Mutex
+	server.MojangLoginHandler
+	Settings struct {
+		Name      string
+		MaxPlayer int
+		MOTD      chat.Message
+	}
+}
+
+func main() {
+	var ms MyServer
+	ms.PlayerList = list.New()
+	ms.MojangLoginHandler.OnlineMode = true
+	ms.MojangLoginHandler.Threshold = 256
+
+	ms.Settings.Name = "MyServer"
+	ms.Settings.MaxPlayer = 20
+	ms.Settings.MOTD = chat.Message{Text: "A Minecraft Server ", Extra: []chat.Message{{Text: "Powered by go-mc", Color: "yellow"}}}
+
+	s := server.Server{
+		ListPingHandler: &ms,
+		LoginHandler:    &ms,
+		GamePlay:        &ms,
+	}
+	if err := s.Listen(":25565"); err != nil {
+		log.Fatalf("Listen error: %v", err)
+	}
+}
+
+func (m *MyServer) Name() string {
+	return m.Settings.Name
+}
+
+func (m *MyServer) Protocol() int {
+	return server.ProtocolVersion
+}
+
+func (m *MyServer) MaxPlayer() int {
+	return m.Settings.MaxPlayer
+}
+
+func (m *MyServer) OnlinePlayer() int {
+	m.PlayerListLock.Lock()
+	defer m.PlayerListLock.Unlock()
+	return m.PlayerList.Len()
+}
+
+func (m *MyServer) PlayerSamples() (sample []server.PlayerSample) {
+	m.PlayerListLock.Lock()
+	defer m.PlayerListLock.Unlock()
+	// get first 10 players
+	sample = make([]server.PlayerSample, 0, 10)
+	v := m.PlayerList.Front()
+	for i := 0; i < 10; i++ {
+		if v == nil {
+			break
+		}
+		sample = append(sample, v.Value.(server.PlayerSample))
+		v = v.Next()
+	}
+	return
+}
+
+func (m *MyServer) Description() chat.Message {
+	return m.Settings.MOTD
+}
+
+func (m *MyServer) AcceptPlayer(name string, id uuid.UUID, protocol int32, conn *net.Conn) {
+	// Add player into PlayerList
+	m.PlayerListLock.Lock()
+	elem := m.PlayerList.PushBack(server.PlayerSample{
+		Name: name,
+		ID:   id,
+	})
+	m.PlayerListLock.Unlock()
+	defer func() {
+		m.PlayerListLock.Lock()
+		defer m.PlayerListLock.Unlock()
+		// remove player in PlayerList
+		m.PlayerList.Remove(elem)
+	}()
+
+	if err := m.joinGame(conn); err != nil {
+		log.Printf("Write packet fail: %v", err)
+		return
+	}
+	if err := m.playerPositionAndLook(conn); err != nil {
+		log.Printf("Write packet fail: %v", err)
+		return
+	}
+
+	var p pk.Packet
+	for {
+		err := conn.ReadPacket(&p)
+		if err != nil {
+			log.Printf("Read packet fail: %v", err)
+			break
+		}
+
+		log.Printf("Read packet: %#X", p.ID)
+	}
+}
+
+//go:embed DimensionCodec.snbt
+var dimensionCodecSNBT string
+
+//go:embed Dimension.snbt
+var dimensionSNBT string
+
+func (m *MyServer) joinGame(conn *net.Conn) error {
+	return conn.WritePacket(pk.Marshal(packetid.Login,
+		pk.Int(0),          // EntityID
+		pk.Boolean(false),  // Is hardcore
+		pk.UnsignedByte(1), // Gamemode
+		pk.Byte(1),         // Previous Gamemode
+		pk.VarInt(1),       // World Count
+		pk.Ary{Len: 1, Ary: []pk.Identifier{"world"}},      // World Names
+		pk.NBT(nbt.StringifiedMessage(dimensionCodecSNBT)), // Dimension codec
+		pk.NBT(nbt.StringifiedMessage(dimensionSNBT)),      // Dimension
+		pk.Identifier("world"),                             // World Name
+		pk.Long(0),                                         // Hashed Seed
+		pk.VarInt(m.Settings.MaxPlayer),                    // Max Players
+		pk.VarInt(15),                                      // View Distance
+		pk.Boolean(false),                                  // Reduced Debug Info
+		pk.Boolean(true),                                   // Enable respawn screen
+		pk.Boolean(false),                                  // Is Debug
+		pk.Boolean(true),                                   // Is Flat
+	))
+}
+
+func (m *MyServer) playerPositionAndLook(conn *net.Conn) error {
+	return conn.WritePacket(pk.Marshal(packetid.PositionClientbound,
+		// https://wiki.vg/index.php?title=Protocol&oldid=16067#Player_Position_And_Look_.28clientbound.29
+		pk.Double(0), pk.Double(0), pk.Double(0), // XYZ
+		pk.Float(0), pk.Float(0), // Yaw Pitch
+		pk.Byte(0),        // flag
+		pk.VarInt(0),      // TP ID
+		pk.Boolean(false), // Dismount vehicle
+	))
+}