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use crate::packet::{Packet, PacketsRecycler};
use crate::streamer::{self, PacketReceiver, PacketSender};
use solana_ledger::blockstore::MAX_DATA_SHREDS_PER_SLOT;
use solana_ledger::shred::{OFFSET_OF_SHRED_INDEX, SIZE_OF_SHRED_INDEX};
use solana_perf::cuda_runtime::PinnedVec;
use solana_perf::packet::limited_deserialize;
use solana_perf::recycler::Recycler;
use std::net::UdpSocket;
use std::sync::atomic::AtomicBool;
use std::sync::mpsc::channel;
use std::sync::Arc;
use std::thread::{self, Builder, JoinHandle};
pub struct ShredFetchStage {
thread_hdls: Vec<JoinHandle<()>>,
}
impl ShredFetchStage {
fn modify_packets<F>(recvr: PacketReceiver, sendr: PacketSender, modify: F)
where
F: Fn(&mut Packet),
{
while let Some(mut p) = recvr.iter().next() {
let index_start = OFFSET_OF_SHRED_INDEX;
let index_end = index_start + SIZE_OF_SHRED_INDEX;
p.packets.iter_mut().for_each(|p| {
p.meta.discard = true;
if index_end <= p.meta.size {
if let Ok(index) = limited_deserialize::<u32>(&p.data[index_start..index_end]) {
if index < MAX_DATA_SHREDS_PER_SLOT as u32 {
p.meta.discard = false;
modify(p);
} else {
inc_new_counter_warn!("shred_fetch_stage-shred_index_overrun", 1);
}
}
}
});
if sendr.send(p).is_err() {
break;
}
}
}
fn packet_modifier<F>(
sockets: Vec<Arc<UdpSocket>>,
exit: &Arc<AtomicBool>,
sender: PacketSender,
recycler: Recycler<PinnedVec<Packet>>,
modify: F,
) -> (Vec<JoinHandle<()>>, JoinHandle<()>)
where
F: Fn(&mut Packet) + Send + 'static,
{
let (packet_sender, packet_receiver) = channel();
let streamers = sockets
.into_iter()
.map(|s| {
streamer::receiver(
s,
&exit,
packet_sender.clone(),
recycler.clone(),
"packet_modifier",
)
})
.collect();
let modifier_hdl = Builder::new()
.name("solana-tvu-fetch-stage-packet-modifier".to_string())
.spawn(|| Self::modify_packets(packet_receiver, sender, modify))
.unwrap();
(streamers, modifier_hdl)
}
pub fn new(
sockets: Vec<Arc<UdpSocket>>,
forward_sockets: Vec<Arc<UdpSocket>>,
repair_socket: Arc<UdpSocket>,
sender: &PacketSender,
exit: &Arc<AtomicBool>,
) -> Self {
let recycler: PacketsRecycler = Recycler::warmed(100, 1024);
let tvu_threads = sockets.into_iter().map(|socket| {
streamer::receiver(
socket,
&exit,
sender.clone(),
recycler.clone(),
"shred_fetch_stage",
)
});
let (tvu_forwards_threads, fwd_thread_hdl) = Self::packet_modifier(
forward_sockets,
&exit,
sender.clone(),
recycler.clone(),
|p| p.meta.forward = true,
);
let (repair_receiver, repair_handler) = Self::packet_modifier(
vec![repair_socket],
&exit,
sender.clone(),
recycler.clone(),
|p| p.meta.repair = true,
);
let mut thread_hdls: Vec<_> = tvu_threads
.chain(tvu_forwards_threads.into_iter())
.collect();
thread_hdls.extend(repair_receiver.into_iter());
thread_hdls.push(fwd_thread_hdl);
thread_hdls.push(repair_handler);
Self { thread_hdls }
}
pub fn join(self) -> thread::Result<()> {
for thread_hdl in self.thread_hdls {
thread_hdl.join()?;
}
Ok(())
}
}