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pinglist.go
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pinglist.go
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package bot
import (
"context"
"errors"
"fmt"
"net"
"os"
"strconv"
"time"
"github.com/maxsupermanhd/go-vmc/v762/data/packetid"
mcnet "github.com/maxsupermanhd/go-vmc/v762/net"
pk "github.com/maxsupermanhd/go-vmc/v762/net/packet"
)
// PingAndList check server status and list online player.
// Returns a JSON data with server status, and the delay.
//
// For more information for JSON format, see https://wiki.vg/Server_List_Ping#Response
func PingAndList(addr string) ([]byte, time.Duration, error) {
conn, err := mcnet.DialMC(addr)
if err != nil {
return nil, 0, LoginErr{"dial connection", err}
}
return pingAndList(context.Background(), addr, conn)
}
// PingAndListTimeout is the version of PingAndList with max request time.
func PingAndListTimeout(addr string, timeout time.Duration) ([]byte, time.Duration, error) {
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
return PingAndListContext(ctx, addr)
}
func PingAndListContext(ctx context.Context, addr string) ([]byte, time.Duration, error) {
conn, err := mcnet.DefaultDialer.DialMCContext(ctx, addr)
if err != nil {
return nil, 0, err
}
return pingAndList(ctx, addr, conn)
}
func pingAndList(ctx context.Context, addr string, conn *mcnet.Conn) (data []byte, delay time.Duration, err error) {
if deadline, hasDeadline := ctx.Deadline(); hasDeadline {
if err := conn.Socket.SetDeadline(deadline); err != nil {
return nil, 0, err
}
defer func() {
// Reset deadline
if err2 := conn.Socket.SetDeadline(time.Time{}); err2 != nil {
if err2 == nil {
err = err2
}
return
}
// Map error type
if errors.Is(err, os.ErrDeadlineExceeded) {
err = context.DeadlineExceeded
}
}()
}
// Split Host and Port
host, portStr, err := net.SplitHostPort(addr)
var port uint64
if err != nil {
var addrErr *net.AddrError
const missingPort = "missing port in address"
if errors.As(err, &addrErr) && addrErr.Err == missingPort {
host, port, err = addr, DefaultPort, nil
} else {
return nil, 0, LoginErr{"split address", err}
}
} else {
port, err = strconv.ParseUint(portStr, 0, 16)
if err != nil {
return nil, 0, LoginErr{"parse port", err}
}
}
const Handshake = 0x00
// 握手
err = conn.WritePacket(pk.Marshal(
Handshake, // Handshake packet ID
pk.VarInt(ProtocolVersion), // Protocol version
pk.String(host), // Server's address
pk.UnsignedShort(port),
pk.Byte(1),
))
if err != nil {
return nil, 0, fmt.Errorf("bot: send handshake packect fail: %v", err)
}
// LIST
// 请求服务器状态
err = conn.WritePacket(pk.Marshal(
packetid.StatusRequest,
))
if err != nil {
return nil, 0, fmt.Errorf("bot: send list packect fail: %v", err)
}
var p pk.Packet
// 服务器返回状态
if err := conn.ReadPacket(&p); err != nil {
return nil, 0, fmt.Errorf("bot: recv list packect fail: %v", err)
}
var s pk.String
err = p.Scan(&s)
if err != nil {
return nil, 0, fmt.Errorf("bot: scan list packect fail: %v", err)
}
// PING
startTime := time.Now()
err = conn.WritePacket(pk.Marshal(
packetid.StatusPingRequest,
pk.Long(startTime.Unix()),
))
if err != nil {
return nil, 0, fmt.Errorf("bot: send ping packect fail: %v", err)
}
if err = conn.ReadPacket(&p); err != nil {
return nil, 0, fmt.Errorf("bot: recv pong packect fail: %v", err)
}
var t pk.Long
err = p.Scan(&t)
if err != nil {
return nil, 0, fmt.Errorf("bot: scan pong packect fail: %v", err)
}
if t != pk.Long(startTime.Unix()) {
return nil, 0, fmt.Errorf("bot: pong packect no match: %v", err)
}
return []byte(s), time.Since(startTime), err
}