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use crate::{protocols::ReturnableConnection, Pea2Pea};
use async_trait::async_trait;
use parking_lot::RwLock;
use tokio::{
io::{AsyncWrite, AsyncWriteExt},
sync::mpsc,
};
use tracing::*;
use std::{any::Any, collections::HashMap, io, net::SocketAddr};
#[async_trait]
pub trait Writing: Pea2Pea
where
Self: Clone + Send + Sync + 'static,
{
type Message: Send;
fn enable_writing(&self) {
let (conn_sender, mut conn_receiver) = mpsc::channel::<ReturnableConnection>(
self.node().config().protocol_handler_queue_depth,
);
let self_clone = self.clone();
let writing_task = tokio::spawn(async move {
trace!(parent: self_clone.node().span(), "spawned the Writing handler task");
while let Some((mut conn, conn_returner)) = conn_receiver.recv().await {
let addr = conn.addr;
let mut writer = conn.writer.take().unwrap();
let mut buffer = Vec::new();
let (outbound_message_sender, mut outbound_message_receiver) =
mpsc::channel(self_clone.node().config().outbound_queue_depth);
if let Some(handler) = self_clone.node().protocols.writing_handler.get() {
handler
.senders
.write()
.insert(addr, outbound_message_sender);
} else {
unreachable!();
}
let writer_clone = self_clone.clone();
let writer_task = tokio::spawn(async move {
let node = writer_clone.node();
trace!(parent: node.span(), "spawned a task for writing messages to {}", addr);
while let Some(msg) = outbound_message_receiver.recv().await {
let msg = msg.downcast::<Self::Message>().unwrap();
match writer_clone
.write_to_stream(*msg, addr, &mut buffer, &mut writer)
.await
{
Ok(len) => {
node.known_peers().register_sent_message(addr, len);
node.stats().register_sent_message(len);
trace!(parent: node.span(), "sent {}B to {}", len, addr);
}
Err(e) => {
node.known_peers().register_failure(addr);
error!(parent: node.span(), "couldn't send a message to {}: {}", addr, e);
if node.config().fatal_io_errors.contains(&e.kind()) {
node.disconnect(addr).await;
break;
}
}
}
}
});
conn.tasks.push(writer_task);
if conn_returner.send(Ok(conn)).is_err() {
unreachable!("could't return a Connection to the Node");
}
}
});
self.node().tasks.lock().push(writing_task);
let hdl = WritingHandler {
handler: conn_sender,
senders: Default::default(),
};
assert!(
self.node().protocols.writing_handler.set(hdl).is_ok(),
"the Writing protocol was enabled more than once!"
);
}
async fn write_to_stream<W: AsyncWrite + Unpin + Send>(
&self,
message: Self::Message,
addr: SocketAddr,
buffer: &mut Vec<u8>,
writer: &mut W,
) -> io::Result<usize> {
self.write_message(addr, &message, buffer)?;
let len = buffer.len();
writer.write_all(buffer).await?;
buffer.clear();
Ok(len)
}
fn write_message<W: io::Write>(
&self,
target: SocketAddr,
message: &Self::Message,
writer: &mut W,
) -> io::Result<()>;
fn send_direct_message(&self, addr: SocketAddr, message: Self::Message) -> io::Result<()> {
if let Some(sender) = self
.node()
.protocols
.writing_handler
.get()
.and_then(|h| h.senders.read().get(&addr).cloned())
{
sender.try_send(Box::new(message)).map_err(|e| {
error!(parent: self.node().span(), "can't send a message to {}: {}", addr, e);
self.node().stats().register_failure();
io::ErrorKind::Other.into()
})
} else {
Err(io::ErrorKind::Unsupported.into())
}
}
fn send_broadcast(&self, message: Self::Message)
where
Self::Message: Clone,
{
if let Some(handler) = self.node().protocols.writing_handler.get() {
let senders = handler.senders.read().clone();
for (addr, message_sender) in senders {
let _ = message_sender.try_send(Box::new(message.clone())).map_err(|e| {
error!(parent: self.node().span(), "can't send a message to {}: {}", addr, e);
self.node().stats().register_failure();
});
}
}
}
}
pub struct WritingHandler {
handler: mpsc::Sender<ReturnableConnection>,
pub(crate) senders: RwLock<HashMap<SocketAddr, mpsc::Sender<Box<dyn Any + Send>>>>,
}
impl WritingHandler {
pub(crate) async fn trigger(&self, item: ReturnableConnection) {
if self.handler.send(item).await.is_err() {
unreachable!();
}
}
}