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Spawn an async test per P2P message to try and resolve latency issues

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This commit is contained in:
Luke Parker
2023-08-31 02:35:50 -04:00
parent 3af9dc5d6f
commit 9bf24480f4
3 changed files with 107 additions and 105 deletions
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194
coordinator/src/main.rs
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@@ -330,115 +330,103 @@ pub async fn handle_p2p<D: Db, P: P2p>(
) {
loop {
let mut msg = p2p.receive().await;
match msg.kind {
P2pMessageKind::KeepAlive => {}
// Spawn a dedicated task to handle this message, ensuring any singularly latent message
// doesn't hold everything up
// TODO2: Move to one task per tributary
tokio::spawn({
let p2p = p2p.clone();
let tributaries = tributaries.clone();
async move {
match msg.kind {
P2pMessageKind::KeepAlive => {}
P2pMessageKind::Tributary(genesis) => {
let tributaries = tributaries.read().await;
let Some(tributary) = tributaries.get(&genesis) else {
log::debug!("received p2p message for unknown network");
continue;
};
P2pMessageKind::Tributary(genesis) => {
let tributaries = tributaries.read().await;
let Some(tributary) = tributaries.get(&genesis) else {
log::debug!("received p2p message for unknown network");
return;
};
log::trace!("handling message for tributary {:?}", tributary.spec.set());
if tributary.tributary.read().await.handle_message(&msg.msg).await {
P2p::broadcast(&p2p, msg.kind, msg.msg).await;
}
}
// TODO2: Rate limit this per timestamp
P2pMessageKind::Heartbeat(genesis) => {
if msg.msg.len() != 40 {
log::error!("validator sent invalid heartbeat");
continue;
}
let tributaries = tributaries.read().await;
let Some(tributary) = tributaries.get(&genesis) else {
log::debug!("received heartbeat message for unknown network");
continue;
};
let tributary_read = tributary.tributary.read().await;
/*
// Have sqrt(n) nodes reply with the blocks
let mut responders = (tributary.spec.n() as f32).sqrt().floor() as u64;
// Try to have at least 3 responders
if responders < 3 {
responders = tributary.spec.n().min(3).into();
}
*/
// Have up to three nodes respond
let responders = u64::from(tributary.spec.n().min(3));
// Decide which nodes will respond by using the latest block's hash as a mutually agreed
// upon entropy source
// This isn't a secure source of entropy, yet it's fine for this
let entropy = u64::from_le_bytes(tributary_read.tip().await[.. 8].try_into().unwrap());
// If n = 10, responders = 3, we want start to be 0 ..= 7 (so the highest is 7, 8, 9)
// entropy % (10 + 1) - 3 = entropy % 8 = 0 ..= 7
let start =
usize::try_from(entropy % (u64::from(tributary.spec.n() + 1) - responders)).unwrap();
let mut selected = false;
for validator in
&tributary.spec.validators()[start .. (start + usize::try_from(responders).unwrap())]
{
if our_key == validator.0 {
selected = true;
break;
log::trace!("handling message for tributary {:?}", tributary.spec.set());
if tributary.tributary.read().await.handle_message(&msg.msg).await {
P2p::broadcast(&p2p, msg.kind, msg.msg).await;
}
}
}
if !selected {
log::debug!("received heartbeat and not selected to respond");
continue;
}
log::debug!("received heartbeat and selected to respond");
// TODO2: Rate limit this per timestamp
P2pMessageKind::Heartbeat(genesis) => {
if msg.msg.len() != 40 {
log::error!("validator sent invalid heartbeat");
return;
}
let reader = tributary_read.reader();
drop(tributary_read);
let tributaries = tributaries.read().await;
let Some(tributary) = tributaries.get(&genesis) else {
log::debug!("received heartbeat message for unknown network");
return;
};
let tributary_read = tributary.tributary.read().await;
let mut latest = msg.msg[.. 32].try_into().unwrap();
while let Some(next) = reader.block_after(&latest) {
let mut res = reader.block(&next).unwrap().serialize();
res.extend(reader.commit(&next).unwrap());
// Also include the timestamp used within the Heartbeat
res.extend(&msg.msg[32 .. 40]);
p2p.send(msg.sender, P2pMessageKind::Block(tributary.spec.genesis()), res).await;
latest = next;
}
}
/*
// Have sqrt(n) nodes reply with the blocks
let mut responders = (tributary.spec.n() as f32).sqrt().floor() as u64;
// Try to have at least 3 responders
if responders < 3 {
responders = tributary.spec.n().min(3).into();
}
*/
P2pMessageKind::Block(genesis) => {
let mut msg_ref: &[u8] = msg.msg.as_ref();
let Ok(block) = Block::<Transaction>::read(&mut msg_ref) else {
log::error!("received block message with an invalidly serialized block");
continue;
};
// Get just the commit
msg.msg.drain(.. (msg.msg.len() - msg_ref.len()));
msg.msg.drain((msg.msg.len() - 8) ..);
// Have up to three nodes respond
let responders = u64::from(tributary.spec.n().min(3));
// Decide which nodes will respond by using the latest block's hash as a mutually agreed
// upon entropy source
// This isn't a secure source of entropy, yet it's fine for this
let entropy = u64::from_le_bytes(tributary_read.tip().await[.. 8].try_into().unwrap());
// If n = 10, responders = 3, we want start to be 0 ..= 7 (so the highest is 7, 8, 9)
// entropy % (10 + 1) - 3 = entropy % 8 = 0 ..= 7
let start =
usize::try_from(entropy % (u64::from(tributary.spec.n() + 1) - responders)).unwrap();
let mut selected = false;
for validator in
&tributary.spec.validators()[start .. (start + usize::try_from(responders).unwrap())]
{
if our_key == validator.0 {
selected = true;
break;
}
}
if !selected {
log::debug!("received heartbeat and not selected to respond");
return;
}
log::debug!("received heartbeat and selected to respond");
let reader = tributary_read.reader();
drop(tributary_read);
let mut latest = msg.msg[.. 32].try_into().unwrap();
while let Some(next) = reader.block_after(&latest) {
let mut res = reader.block(&next).unwrap().serialize();
res.extend(reader.commit(&next).unwrap());
// Also include the timestamp used within the Heartbeat
res.extend(&msg.msg[32 .. 40]);
p2p.send(msg.sender, P2pMessageKind::Block(tributary.spec.genesis()), res).await;
latest = next;
}
}
P2pMessageKind::Block(genesis) => {
let mut msg_ref: &[u8] = msg.msg.as_ref();
let Ok(block) = Block::<Transaction>::read(&mut msg_ref) else {
log::error!("received block message with an invalidly serialized block");
return;
};
// Get just the commit
msg.msg.drain(.. (msg.msg.len() - msg_ref.len()));
msg.msg.drain((msg.msg.len() - 8) ..);
// Spawn a dedicated task to add this block, as it may take a notable amount of time
// While we could use a long-lived task to add each block, that task would only add one
// block at a time *across all tributaries*
// We either need:
// 1) One task per tributary
// 2) Background tasks
// 3) For sync_block to return instead of waiting for provided transactions which are
// missing
// sync_block waiting is preferable since we know the block is valid by its commit, meaning
// we are the node behind
// As for 1/2, 1 may be preferable since this message may frequently occur
// This is suitably performant, as tokio HTTP servers will even spawn a new task per
// connection
// In order to reduce congestion though, we should at least check if we take value from
// this message before running spawn
// TODO2
tokio::spawn({
let tributaries = tributaries.clone();
async move {
let tributaries = tributaries.read().await;
let Some(tributary) = tributaries.get(&genesis) else {
log::debug!("received block message for unknown network");
@@ -448,9 +436,9 @@ pub async fn handle_p2p<D: Db, P: P2p>(
let res = tributary.tributary.read().await.sync_block(block, msg.msg).await;
log::debug!("received block from {:?}, sync_block returned {}", msg.sender, res);
}
});
}
}
}
});
}
}