minecraft-pinger 0.1.2

A high-performance, asynchronous Rust library for pinging Minecraft servers to retrieve status, players, and metadata.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55

use crate::common::protocol::{read_var_int, read_var_int_stream, write_string, write_var_int};
use crate::error::PingError;
use bytes::{BufMut, Bytes, BytesMut};
use log::debug;
use tokio::io::AsyncReadExt;

// Packets
pub(crate) fn write_ping_handshake(buffer: &mut BytesMut, hostname: &str, port: &u16, protocol_version: &i32) {
    let mut handshake = BytesMut::with_capacity(128);
    handshake.put_u8(0x00);
    write_var_int(&mut handshake, *protocol_version); // protocol version
    write_string(&mut handshake, hostname);
    handshake.put_u16(*port); // Server Port
    write_var_int(&mut handshake, 1); // next state = 1 status

    write_var_int(buffer, handshake.len() as i32);
    buffer.put(handshake.freeze());
}

pub(crate) fn write_ping_request(buffer: &mut BytesMut) {
    write_var_int(buffer, 1); // length
    write_var_int(buffer, 0x00); // packet id
}

pub(crate) struct Packet {
    id: u8,
    pub data: Bytes,
}

impl Packet {
    pub fn new(id: u8, data: Bytes) -> Packet {
        Packet { id, data }
    }

    pub fn id(&self) -> u8 {
        self.id
    }
}

pub(crate) async fn read_packet<R: AsyncReadExt + Unpin>(stream: &mut R) -> Result<Packet, PingError> {
    let length = read_var_int_stream(stream).await?;

    // Lire exactement `length` bytes
    let mut buf = vec![0u8; length as usize];
    stream.read_exact(&mut buf)
        .await
        .map_err(|e| {
            debug!("Read packet error 2 {e}");
            PingError::ReadPacket(e.to_string())
        })?;

    let mut data = Bytes::from(buf);

    Ok(Packet::new(read_var_int(&mut data)? as u8, data))
}