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use bytes::BytesMut;
use tokio::{
net::UdpSocket,
sync::{mpsc, watch},
};
use crate::{
channel::{command::DatagramCommand, DatagramChannel},
context::{BusinessContext, DatagramContext, DatagramInfo, InboundContext, OutboundContext},
life::Life,
pipeline::datagram::runtime::{
flush_datagrams, queue_datagram, DatagramRuntimePipeline, PendingDatagrams,
},
transport::{shutdown, udp::config::UdpSocketConfig},
Error, Result,
};
pub(crate) struct DatagramSocketRuntime<P>
where
P: DatagramRuntimePipeline,
{
pub id: u64,
pub socket: UdpSocket,
pub pipeline: P,
pub config: UdpSocketConfig,
pub channel: DatagramChannel<P::Write>,
pub rx: mpsc::Receiver<DatagramCommand<P::Write>>,
pub shutdown_rx: Option<watch::Receiver<bool>>,
}
pub(crate) async fn run_datagram_socket_with_life<P, L>(
runtime: DatagramSocketRuntime<P>,
life: L,
) -> Result<()>
where
P: DatagramRuntimePipeline,
L: Life,
{
let DatagramSocketRuntime {
id,
socket,
mut pipeline,
config,
channel,
mut rx,
mut shutdown_rx,
} = runtime;
let local_addr = socket.local_addr()?;
let read_buffer_capacity = config
.read_buffer_capacity
.max(config.max_datagram_size)
.max(1);
let mut read_buf = vec![0_u8; read_buffer_capacity];
let mut write_buf = BytesMut::with_capacity(config.write_buffer_capacity);
let mut pending_datagrams = PendingDatagrams::new();
if let Err(err) = life.udp_socket_started(local_addr).await {
tracing::warn!(
socket_id = id,
local_addr = %local_addr,
error = ?err,
"udp socket start life hook failed"
);
return Err(err);
}
let result: Result<()> = async {
loop {
if shutdown::requested(&shutdown_rx) {
break;
}
tokio::select! {
read = socket.recv_from(&mut read_buf) => {
let (read_len, peer_addr) = match read {
Ok(read) => read,
Err(err) => {
tracing::warn!(
socket_id = id,
local_addr = %local_addr,
stage = "recv_from",
error = ?err,
"udp socket runtime error"
);
return Err(err.into());
}
};
if read_len > config.max_datagram_size {
let err = Error::DatagramTooLarge {
current: read_len,
max: config.max_datagram_size,
};
tracing::warn!(
socket_id = id,
local_addr = %local_addr,
peer_addr = %peer_addr,
stage = "datagram_size_check",
error = ?err,
"udp socket runtime error"
);
return Err(err);
}
let msg = match pipeline.decode_datagram(&read_buf[..read_len]) {
Ok(msg) => msg,
Err(err) => {
tracing::warn!(
socket_id = id,
local_addr = %local_addr,
peer_addr = %peer_addr,
stage = "decode_datagram",
error = ?err,
"udp socket runtime error"
);
return Err(err);
}
};
let info = DatagramInfo::new(id, peer_addr, local_addr);
let mut inbound_ctx = InboundContext::new_datagram(info);
let mut business_ctx = BusinessContext::new_datagram(info);
let mut ctx = DatagramContext::new(info, channel.clone());
let mut outbound_ctx = OutboundContext::new_datagram(info);
if let Err(err) = pipeline
.process_inbound_flushable(
&mut inbound_ctx,
&mut business_ctx,
&mut outbound_ctx,
&mut ctx,
&socket,
&mut write_buf,
&mut pending_datagrams,
msg,
)
.await
{
tracing::warn!(
socket_id = id,
local_addr = %local_addr,
peer_addr = %peer_addr,
stage = "inbound_pipeline",
error = ?err,
"udp socket runtime error"
);
return Err(err);
}
if ctx.close_requested() {
return Ok(());
}
}
cmd = rx.recv() => {
match cmd {
Some(DatagramCommand::WriteTo(peer_addr, msg)) => {
let info = DatagramInfo::new(id, peer_addr, local_addr);
let mut outbound_ctx = OutboundContext::new_datagram(info);
if let Err(err) = pipeline
.process_outbound(&mut outbound_ctx, msg, &mut write_buf)
.await
{
tracing::warn!(
socket_id = id,
local_addr = %local_addr,
peer_addr = %peer_addr,
stage = "outbound_pipeline",
error = ?err,
"udp socket runtime error"
);
return Err(err);
}
queue_datagram(peer_addr, &mut write_buf, &mut pending_datagrams);
}
Some(DatagramCommand::Flush(done)) => {
let result = flush_datagrams(&socket, &mut pending_datagrams).await;
let ack = match &result {
Ok(()) => Ok(()),
Err(err) => Err(Error::Pipeline(format!("flush failed: {err}"))),
};
let _ = done.send(ack);
result?;
}
Some(DatagramCommand::WriteToAndFlush(peer_addr, msg, done)) => {
let info = DatagramInfo::new(id, peer_addr, local_addr);
let mut outbound_ctx = OutboundContext::new_datagram(info);
let result = async {
if let Err(err) = pipeline
.process_outbound(&mut outbound_ctx, msg, &mut write_buf)
.await
{
tracing::warn!(
socket_id = id,
local_addr = %local_addr,
peer_addr = %peer_addr,
stage = "outbound_pipeline",
error = ?err,
"udp socket runtime error"
);
return Err(err);
}
queue_datagram(peer_addr, &mut write_buf, &mut pending_datagrams);
if let Err(err) = flush_datagrams(&socket, &mut pending_datagrams).await {
tracing::warn!(
socket_id = id,
local_addr = %local_addr,
peer_addr = %peer_addr,
stage = "flush_datagrams",
error = ?err,
"udp socket runtime error"
);
return Err(err);
}
Ok(())
}
.await;
let ack = match &result {
Ok(()) => Ok(()),
Err(err) => Err(Error::Pipeline(format!(
"write_to_and_flush failed: {err}"
))),
};
let _ = done.send(ack);
result?;
}
Some(DatagramCommand::Close) | None => {
break;
}
}
}
_ = shutdown::wait(&mut shutdown_rx) => {
break;
}
}
}
Ok(())
}
.await;
match result {
Ok(()) => {
tracing::debug!(
socket_id = id,
local_addr = %local_addr,
"udp socket stopped"
);
life.udp_socket_stopped(local_addr).await
}
Err(err) => {
tracing::warn!(
socket_id = id,
local_addr = %local_addr,
error = ?err,
"udp socket stopped with error"
);
if let Err(life_err) = life.udp_socket_stopped(local_addr).await {
tracing::debug!(
local_addr = %local_addr,
error = ?life_err,
"udp life hook failed while stopping errored socket"
);
}
Err(err)
}
}
}