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
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159

//! The `packet` module defines data structures and methods to pull data from the network.
use crate::recvmmsg::{recv_mmsg, NUM_RCVMMSGS};
pub use solana_perf::packet::{
    limited_deserialize, to_packets, to_packets_chunked, Packets, PacketsRecycler, NUM_PACKETS,
    PACKETS_BATCH_SIZE, PACKETS_PER_BATCH,
};

use solana_metrics::inc_new_counter_debug;
pub use solana_sdk::packet::{Meta, Packet, PACKET_DATA_SIZE};
use std::{io::Result, net::UdpSocket, time::Instant};

pub fn recv_from(obj: &mut Packets, socket: &UdpSocket, max_wait_ms: usize) -> Result<usize> {
    let mut i = 0;
    //DOCUMENTED SIDE-EFFECT
    //Performance out of the IO without poll
    //  * block on the socket until it's readable
    //  * set the socket to non blocking
    //  * read until it fails
    //  * set it back to blocking before returning
    socket.set_nonblocking(false)?;
    trace!("receiving on {}", socket.local_addr().unwrap());
    let start = Instant::now();
    loop {
        obj.packets.resize(
            std::cmp::min(i + NUM_RCVMMSGS, PACKETS_PER_BATCH),
            Packet::default(),
        );
        match recv_mmsg(socket, &mut obj.packets[i..]) {
            Err(_) if i > 0 => {
                if start.elapsed().as_millis() > 1 {
                    break;
                }
            }
            Err(e) => {
                trace!("recv_from err {:?}", e);
                return Err(e);
            }
            Ok((_, npkts)) => {
                if i == 0 {
                    socket.set_nonblocking(true)?;
                }
                trace!("got {} packets", npkts);
                i += npkts;
                // Try to batch into big enough buffers
                // will cause less re-shuffling later on.
                if start.elapsed().as_millis() > max_wait_ms as u128 || i >= PACKETS_PER_BATCH {
                    break;
                }
            }
        }
    }
    obj.packets.truncate(i);
    inc_new_counter_debug!("packets-recv_count", i);
    Ok(i)
}

pub fn send_to(obj: &Packets, socket: &UdpSocket) -> Result<()> {
    for p in &obj.packets {
        let a = p.meta.addr();
        socket.send_to(&p.data[..p.meta.size], &a)?;
    }
    Ok(())
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::io;
    use std::io::Write;
    use std::net::{SocketAddr, UdpSocket};

    #[test]
    fn test_packets_set_addr() {
        // test that the address is actually being updated
        let send_addr: SocketAddr = "127.0.0.1:123".parse().unwrap();
        let packets = vec![Packet::default()];
        let mut msgs = Packets::new(packets);
        msgs.set_addr(&send_addr);
        assert_eq!(msgs.packets[0].meta.addr(), send_addr);
    }

    #[test]
    pub fn packet_send_recv() {
        solana_logger::setup();
        let recv_socket = UdpSocket::bind("127.0.0.1:0").expect("bind");
        let addr = recv_socket.local_addr().unwrap();
        let send_socket = UdpSocket::bind("127.0.0.1:0").expect("bind");
        let saddr = send_socket.local_addr().unwrap();
        let mut p = Packets::default();

        p.packets.resize(10, Packet::default());

        for m in p.packets.iter_mut() {
            m.meta.set_addr(&addr);
            m.meta.size = PACKET_DATA_SIZE;
        }
        send_to(&p, &send_socket).unwrap();

        let recvd = recv_from(&mut p, &recv_socket, 1).unwrap();

        assert_eq!(recvd, p.packets.len());

        for m in &p.packets {
            assert_eq!(m.meta.size, PACKET_DATA_SIZE);
            assert_eq!(m.meta.addr(), saddr);
        }
    }

    #[test]
    pub fn debug_trait() {
        write!(io::sink(), "{:?}", Packet::default()).unwrap();
        write!(io::sink(), "{:?}", Packets::default()).unwrap();
    }

    #[test]
    fn test_packet_partial_eq() {
        let mut p1 = Packet::default();
        let mut p2 = Packet::default();

        p1.meta.size = 1;
        p1.data[0] = 0;

        p2.meta.size = 1;
        p2.data[0] = 0;

        assert!(p1 == p2);

        p2.data[0] = 4;
        assert!(p1 != p2);
    }

    #[test]
    fn test_packet_resize() {
        solana_logger::setup();
        let recv_socket = UdpSocket::bind("127.0.0.1:0").expect("bind");
        let addr = recv_socket.local_addr().unwrap();
        let send_socket = UdpSocket::bind("127.0.0.1:0").expect("bind");
        let mut p = Packets::default();
        p.packets.resize(PACKETS_PER_BATCH, Packet::default());

        // Should only get PACKETS_PER_BATCH packets per iteration even
        // if a lot more were sent, and regardless of packet size
        for _ in 0..2 * PACKETS_PER_BATCH {
            let mut p = Packets::default();
            p.packets.resize(1, Packet::default());
            for m in p.packets.iter_mut() {
                m.meta.set_addr(&addr);
                m.meta.size = 1;
            }
            send_to(&p, &send_socket).unwrap();
        }

        let recvd = recv_from(&mut p, &recv_socket, 100).unwrap();

        // Check we only got PACKETS_PER_BATCH packets
        assert_eq!(recvd, PACKETS_PER_BATCH);
        assert_eq!(p.packets.capacity(), PACKETS_PER_BATCH);
    }
}