use core::{cmp, fmt};
use core::convert::TryFrom;
use crate::sync::{RwLock, RwLockReadGuard, LockTestExt};
-#[cfg(feature = "std")]
use core::sync::atomic::{AtomicUsize, Ordering};
use crate::sync::Mutex;
use core::ops::{Bound, Deref};
// Lock order: channels -> nodes
channels: RwLock<IndexedMap<u64, ChannelInfo>>,
nodes: RwLock<IndexedMap<NodeId, NodeInfo>>,
+ removed_node_counters: Mutex<Vec<u32>>,
+ next_node_counter: AtomicUsize,
// Lock order: removed_channels -> removed_nodes
//
// NOTE: In the following `removed_*` maps, we use seconds since UNIX epoch to track time instead
}
}
-#[derive(Clone, Debug, PartialEq, Eq)]
+#[derive(Clone, Debug, Eq)]
/// Details about a node in the network, known from the network announcement.
pub struct NodeInfo {
/// All valid channels a node has announced
/// More information about a node from node_announcement.
/// Optional because we store a Node entry after learning about it from
/// a channel announcement, but before receiving a node announcement.
- pub announcement_info: Option<NodeAnnouncementInfo>
+ pub announcement_info: Option<NodeAnnouncementInfo>,
+ /// In memory, each node is assigned a unique ID. They are eagerly reused, ensuring they remain
+ /// relatively dense.
+ ///
+ /// These IDs allow the router to avoid a `HashMap` lookup by simply using this value as an
+ /// index in a `Vec`, skipping a big step in some of the hottest code when routing.
+ pub(crate) node_counter: u32,
+}
+
+impl PartialEq for NodeInfo {
+ fn eq(&self, o: &NodeInfo) -> bool {
+ self.channels == o.channels && self.announcement_info == o.announcement_info
+ }
}
impl fmt::Display for NodeInfo {
Ok(NodeInfo {
announcement_info: announcement_info_wrap.map(|w| w.0),
channels,
+ node_counter: u32::max_value(),
})
}
}
impl<L: Deref> Writeable for NetworkGraph<L> where L::Target: Logger {
fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
+ self.test_node_counter_consistency();
+
write_ver_prefix!(writer, SERIALIZATION_VERSION, MIN_SERIALIZATION_VERSION);
self.chain_hash.write(writer)?;
channels.insert(chan_id, chan_info);
}
let nodes_count: u64 = Readable::read(reader)?;
+ if nodes_count > u32::max_value() as u64 / 2 { return Err(DecodeError::InvalidValue); }
// In Nov, 2023 there were about 69K channels; we cap allocations to 1.5x that.
let mut nodes = IndexedMap::with_capacity(cmp::min(nodes_count as usize, 103500));
- for _ in 0..nodes_count {
+ for i in 0..nodes_count {
let node_id = Readable::read(reader)?;
- let node_info = Readable::read(reader)?;
+ let mut node_info: NodeInfo = Readable::read(reader)?;
+ node_info.node_counter = i as u32;
nodes.insert(node_id, node_info);
}
logger,
channels: RwLock::new(channels),
nodes: RwLock::new(nodes),
+ removed_node_counters: Mutex::new(Vec::new()),
+ next_node_counter: AtomicUsize::new(nodes_count as usize),
last_rapid_gossip_sync_timestamp: Mutex::new(last_rapid_gossip_sync_timestamp),
removed_nodes: Mutex::new(HashMap::new()),
removed_channels: Mutex::new(HashMap::new()),
logger,
channels: RwLock::new(IndexedMap::new()),
nodes: RwLock::new(IndexedMap::new()),
+ next_node_counter: AtomicUsize::new(0),
+ removed_node_counters: Mutex::new(Vec::new()),
last_rapid_gossip_sync_timestamp: Mutex::new(None),
removed_channels: Mutex::new(HashMap::new()),
removed_nodes: Mutex::new(HashMap::new()),
}
}
+ fn test_node_counter_consistency(&self) {
+ #[cfg(debug_assertions)] {
+ let nodes = self.nodes.read().unwrap();
+ let removed_node_counters = self.removed_node_counters.lock().unwrap();
+ let next_counter = self.next_node_counter.load(Ordering::Acquire);
+ assert!(next_counter < (u32::max_value() as usize) / 2);
+ let mut used_node_counters = vec![0u8; next_counter / 8 + 1];
+
+ for counter in removed_node_counters.iter() {
+ let pos = (*counter as usize) / 8;
+ let bit = 1 << (counter % 8);
+ assert_eq!(used_node_counters[pos] & bit, 0);
+ used_node_counters[pos] |= bit;
+ }
+ for (_, node) in nodes.unordered_iter() {
+ assert!((node.node_counter as usize) < next_counter);
+ let pos = (node.node_counter as usize) / 8;
+ let bit = 1 << (node.node_counter % 8);
+ assert_eq!(used_node_counters[pos] & bit, 0);
+ used_node_counters[pos] |= bit;
+ }
+ }
+ }
+
/// Returns a read-only view of the network graph.
pub fn read_only(&'_ self) -> ReadOnlyNetworkGraph<'_> {
+ self.test_node_counter_consistency();
let channels = self.channels.read().unwrap();
let nodes = self.nodes.read().unwrap();
ReadOnlyNetworkGraph {
// b) we don't track UTXOs of channels we know about and remove them if they
// get reorg'd out.
// c) it's unclear how to do so without exposing ourselves to massive DoS risk.
- Self::remove_channel_in_nodes(&mut nodes, &entry.get(), short_channel_id);
+ self.remove_channel_in_nodes(&mut nodes, &entry.get(), short_channel_id);
*entry.get_mut() = channel_info;
} else {
return Err(LightningError{err: "Already have knowledge of channel".to_owned(), action: ErrorAction::IgnoreDuplicateGossip});
node_entry.into_mut().channels.push(short_channel_id);
},
IndexedMapEntry::Vacant(node_entry) => {
+ let mut removed_node_counters = self.removed_node_counters.lock().unwrap();
+ let node_counter = removed_node_counters.pop()
+ .unwrap_or(self.next_node_counter.fetch_add(1, Ordering::Relaxed) as u32);
node_entry.insert(NodeInfo {
channels: vec!(short_channel_id),
announcement_info: None,
+ node_counter,
});
}
};
if let Some(chan) = channels.remove(&short_channel_id) {
let mut nodes = self.nodes.write().unwrap();
self.removed_channels.lock().unwrap().insert(short_channel_id, current_time_unix);
- Self::remove_channel_in_nodes(&mut nodes, &chan, short_channel_id);
+ self.remove_channel_in_nodes(&mut nodes, &chan, short_channel_id);
}
}
let mut removed_nodes = self.removed_nodes.lock().unwrap();
if let Some(node) = nodes.remove(&node_id) {
+ let mut removed_node_counters = self.removed_node_counters.lock().unwrap();
for scid in node.channels.iter() {
if let Some(chan_info) = channels.remove(scid) {
let other_node_id = if node_id == chan_info.node_one { chan_info.node_two } else { chan_info.node_one };
*scid != *chan_id
});
if other_node_entry.get().channels.is_empty() {
+ removed_node_counters.push(other_node_entry.get().node_counter);
other_node_entry.remove_entry();
}
}
removed_channels.insert(*scid, current_time_unix);
}
}
+ removed_node_counters.push(node.node_counter);
removed_nodes.insert(node_id, current_time_unix);
}
}
let mut nodes = self.nodes.write().unwrap();
for scid in scids_to_remove {
let info = channels.remove(&scid).expect("We just accessed this scid, it should be present");
- Self::remove_channel_in_nodes(&mut nodes, &info, scid);
+ self.remove_channel_in_nodes(&mut nodes, &info, scid);
self.removed_channels.lock().unwrap().insert(scid, Some(current_time_unix));
}
}
Ok(())
}
- fn remove_channel_in_nodes(nodes: &mut IndexedMap<NodeId, NodeInfo>, chan: &ChannelInfo, short_channel_id: u64) {
+ fn remove_channel_in_nodes(&self, nodes: &mut IndexedMap<NodeId, NodeInfo>, chan: &ChannelInfo, short_channel_id: u64) {
macro_rules! remove_from_node {
($node_id: expr) => {
if let IndexedMapEntry::Occupied(mut entry) = nodes.entry($node_id) {
short_channel_id != *chan_id
});
if entry.get().channels.is_empty() {
+ self.removed_node_counters.lock().unwrap().push(entry.get().node_counter);
entry.remove_entry();
}
} else {
let valid_node_info = NodeInfo {
channels: Vec::new(),
announcement_info: Some(valid_node_ann_info),
+ node_counter: 0,
};
let mut encoded_valid_node_info = Vec::new();
projects / rust-lightning / commitdiff