Rename cmd -> examples

examples/simpleServer/status.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"encoding/json"
+	"github.com/Tnze/go-mc/chat"
+	"github.com/Tnze/go-mc/net"
+	pk "github.com/Tnze/go-mc/net/packet"
+	"github.com/google/uuid"
+	"log"
+)
+
+func acceptListPing(conn net.Conn) {
+	var p pk.Packet
+	for i := 0; i < 2; i++ { // ping or list. Only accept twice
+		err := conn.ReadPacket(&p)
+		if err != nil {
+			return
+		}
+
+		switch p.ID {
+		case 0x00: //List
+			err = conn.WritePacket(pk.Marshal(0x00, pk.String(listResp())))
+		case 0x01: //Ping
+			err = conn.WritePacket(p)
+		}
+		if err != nil {
+			return
+		}
+	}
+}
+
+type player struct {
+	Name string    `json:"name"`
+	ID   uuid.UUID `json:"id"`
+}
+
+// listResp return server status as JSON string
+func listResp() string {
+	var list struct {
+		Version struct {
+			Name     string `json:"name"`
+			Protocol int    `json:"protocol"`
+		} `json:"version"`
+		Players struct {
+			Max    int      `json:"max"`
+			Online int      `json:"online"`
+			Sample []player `json:"sample"`
+		} `json:"players"`
+		Description chat.Message `json:"description"`
+		FavIcon     string       `json:"favicon,omitempty"`
+	}
+
+	list.Version.Name = "Chat Server"
+	list.Version.Protocol = ProtocolVersion
+	list.Players.Max = MaxPlayer
+	list.Players.Online = 123
+	list.Players.Sample = []player{} // must init. can't be nil
+	list.Description = chat.Message{Text: "Powered by go-mc", Color: "blue"}
+
+	data, err := json.Marshal(list)
+	if err != nil {
+		log.Panic("Marshal JSON for status checking fail")
+	}
+	return string(data)
+}