193 lines
5.9 KiB
Rust
193 lines
5.9 KiB
Rust
//! The `packet` module defines data structures and methods to pull data from the network.
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use {
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crate::{
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recvmmsg::{recv_mmsg, NUM_RCVMMSGS},
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socket::SocketAddrSpace,
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},
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solana_metrics::inc_new_counter_debug,
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std::{
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io::Result,
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net::UdpSocket,
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time::{Duration, Instant},
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},
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};
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pub use {
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solana_perf::packet::{
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to_packet_batches, PacketBatch, PacketBatchRecycler, NUM_PACKETS, PACKETS_PER_BATCH,
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},
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solana_sdk::packet::{Meta, Packet, PACKET_DATA_SIZE},
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};
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pub fn recv_from(batch: &mut PacketBatch, socket: &UdpSocket, max_wait: Duration) -> Result<usize> {
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let mut i = 0;
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//DOCUMENTED SIDE-EFFECT
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//Performance out of the IO without poll
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// * block on the socket until it's readable
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// * set the socket to non blocking
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// * read until it fails
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// * set it back to blocking before returning
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socket.set_nonblocking(false)?;
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trace!("receiving on {}", socket.local_addr().unwrap());
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let start = Instant::now();
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loop {
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batch.resize(
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std::cmp::min(i + NUM_RCVMMSGS, PACKETS_PER_BATCH),
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Packet::default(),
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);
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match recv_mmsg(socket, &mut batch[i..]) {
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Err(_) if i > 0 => {
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if start.elapsed() > max_wait {
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break;
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}
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}
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Err(e) => {
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trace!("recv_from err {:?}", e);
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return Err(e);
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}
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Ok(npkts) => {
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if i == 0 {
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socket.set_nonblocking(true)?;
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}
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trace!("got {} packets", npkts);
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i += npkts;
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// Try to batch into big enough buffers
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// will cause less re-shuffling later on.
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if start.elapsed() > max_wait || i >= PACKETS_PER_BATCH {
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break;
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}
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}
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}
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}
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batch.truncate(i);
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inc_new_counter_debug!("packets-recv_count", i);
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Ok(i)
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}
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pub fn send_to(
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batch: &PacketBatch,
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socket: &UdpSocket,
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socket_addr_space: &SocketAddrSpace,
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) -> Result<()> {
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for p in batch.iter() {
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let addr = p.meta().socket_addr();
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if socket_addr_space.check(&addr) {
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if let Some(data) = p.data(..) {
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socket.send_to(data, addr)?;
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}
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}
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}
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Ok(())
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}
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#[cfg(test)]
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mod tests {
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use {
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super::*,
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std::{
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io,
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io::Write,
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net::{SocketAddr, UdpSocket},
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},
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};
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#[test]
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fn test_packets_set_addr() {
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// test that the address is actually being updated
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let send_addr: SocketAddr = "127.0.0.1:123".parse().unwrap();
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let packets = vec![Packet::default()];
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let mut packet_batch = PacketBatch::new(packets);
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packet_batch.set_addr(&send_addr);
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assert_eq!(packet_batch[0].meta().socket_addr(), send_addr);
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}
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#[test]
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pub fn packet_send_recv() {
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solana_logger::setup();
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let recv_socket = UdpSocket::bind("127.0.0.1:0").expect("bind");
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let addr = recv_socket.local_addr().unwrap();
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let send_socket = UdpSocket::bind("127.0.0.1:0").expect("bind");
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let saddr = send_socket.local_addr().unwrap();
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let packet_batch_size = 10;
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let mut batch = PacketBatch::with_capacity(packet_batch_size);
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batch.resize(packet_batch_size, Packet::default());
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for m in batch.iter_mut() {
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m.meta_mut().set_socket_addr(&addr);
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m.meta_mut().size = PACKET_DATA_SIZE;
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}
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send_to(&batch, &send_socket, &SocketAddrSpace::Unspecified).unwrap();
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batch
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.iter_mut()
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.for_each(|pkt| *pkt.meta_mut() = Meta::default());
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let recvd = recv_from(
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&mut batch,
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&recv_socket,
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Duration::from_millis(1), // max_wait
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)
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.unwrap();
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assert_eq!(recvd, batch.len());
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for m in batch.iter() {
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assert_eq!(m.meta().size, PACKET_DATA_SIZE);
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assert_eq!(m.meta().socket_addr(), saddr);
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}
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}
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#[test]
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pub fn debug_trait() {
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write!(io::sink(), "{:?}", Packet::default()).unwrap();
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write!(io::sink(), "{:?}", PacketBatch::default()).unwrap();
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}
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#[test]
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fn test_packet_partial_eq() {
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let mut p1 = Packet::default();
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let mut p2 = Packet::default();
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p1.meta_mut().size = 1;
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p1.buffer_mut()[0] = 0;
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p2.meta_mut().size = 1;
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p2.buffer_mut()[0] = 0;
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assert!(p1 == p2);
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p2.buffer_mut()[0] = 4;
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assert!(p1 != p2);
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}
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#[test]
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fn test_packet_resize() {
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solana_logger::setup();
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let recv_socket = UdpSocket::bind("127.0.0.1:0").expect("bind");
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let addr = recv_socket.local_addr().unwrap();
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let send_socket = UdpSocket::bind("127.0.0.1:0").expect("bind");
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let mut batch = PacketBatch::with_capacity(PACKETS_PER_BATCH);
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batch.resize(PACKETS_PER_BATCH, Packet::default());
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// Should only get PACKETS_PER_BATCH packets per iteration even
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// if a lot more were sent, and regardless of packet size
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for _ in 0..2 * PACKETS_PER_BATCH {
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let batch_size = 1;
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let mut batch = PacketBatch::with_capacity(batch_size);
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batch.resize(batch_size, Packet::default());
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for p in batch.iter_mut() {
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p.meta_mut().set_socket_addr(&addr);
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p.meta_mut().size = 1;
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}
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send_to(&batch, &send_socket, &SocketAddrSpace::Unspecified).unwrap();
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}
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let recvd = recv_from(
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&mut batch,
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&recv_socket,
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Duration::from_millis(100), // max_wait
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)
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.unwrap();
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// Check we only got PACKETS_PER_BATCH packets
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assert_eq!(recvd, PACKETS_PER_BATCH);
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assert_eq!(batch.capacity(), PACKETS_PER_BATCH);
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}
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}
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