94 lines
2.5 KiB
Go
94 lines
2.5 KiB
Go
package bot
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import (
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"fmt"
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"time"
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"github.com/Tnze/go-mc/net"
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pk "github.com/Tnze/go-mc/net/packet"
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)
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// PingAndList check server status and list online player.
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// Returns a JSON data with server status, and the delay.
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//
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// For more information for JSON format, see https://wiki.vg/Server_List_Ping#Response
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func PingAndList(addr string, port int) ([]byte, time.Duration, error) {
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conn, err := net.DialMC(fmt.Sprintf("%s:%d", addr, port))
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if err != nil {
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return nil, 0, fmt.Errorf("bot: dial fail: %v", err)
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}
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return pingAndList(addr, port, conn)
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}
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// PingAndListTimeout PingAndLIstTimeout is the version of PingAndList with max request time.
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func PingAndListTimeout(addr string, port int, timeout time.Duration) ([]byte, time.Duration, error) {
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deadLine := time.Now().Add(timeout)
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conn, err := net.DialMCTimeout(fmt.Sprintf("%s:%d", addr, port), timeout)
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if err != nil {
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return nil, 0, fmt.Errorf("bot: dial fail: %v", err)
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}
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err = conn.Socket.SetDeadline(deadLine)
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if err != nil {
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return nil, 0, fmt.Errorf("bot: set deadline fail: %v", err)
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}
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return pingAndList(addr, port, conn)
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}
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func pingAndList(addr string, port int, conn *net.Conn) ([]byte, time.Duration, error) {
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//握手
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err := conn.WritePacket(
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//Handshake Packet
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pk.Marshal(
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0x00, //Handshake packet ID
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pk.VarInt(ProtocolVersion), //Protocol version
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pk.String(addr), //Server's address
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pk.UnsignedShort(port),
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pk.Byte(1),
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))
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if err != nil {
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return nil, 0, fmt.Errorf("bot: send handshake packect fail: %v", err)
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}
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//LIST
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//请求服务器状态
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err = conn.WritePacket(pk.Marshal(0))
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if err != nil {
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return nil, 0, fmt.Errorf("bot: send list packect fail: %v", err)
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}
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var p pk.Packet
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//服务器返回状态
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if err := conn.ReadPacket(&p); err != nil {
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return nil, 0, fmt.Errorf("bot: recv list packect fail: %v", err)
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}
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var s pk.String
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err = p.Scan(&s)
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if err != nil {
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return nil, 0, fmt.Errorf("bot: scan list packect fail: %v", err)
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}
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//PING
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startTime := time.Now()
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err = conn.WritePacket(pk.Marshal(0x01, pk.Long(startTime.Unix())))
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if err != nil {
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return nil, 0, fmt.Errorf("bot: send ping packect fail: %v", err)
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}
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if err = conn.ReadPacket(&p); err != nil {
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return nil, 0, fmt.Errorf("bot: recv pong packect fail: %v", err)
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}
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var t pk.Long
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err = p.Scan(&t)
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if err != nil {
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return nil, 0, fmt.Errorf("bot: scan pong packect fail: %v", err)
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}
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if t != pk.Long(startTime.Unix()) {
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return nil, 0, fmt.Errorf("bot: pong packect no match: %v", err)
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}
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return []byte(s), time.Since(startTime), err
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}
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