Fewer full vec allocations

[dnsseed-rust] / src / datastore.rs

diff --git a/src/datastore.rs b/src/datastore.rs
index 6f4345883faca87005ab68984cb5a674827677e2..90ebbd923585b74b340bdd21a7784b6493d2b034 100644 (file)
--- a/src/datastore.rs
+++ b/src/datastore.rs
@@ -1,4 +1,4 @@
-use std::{cmp, mem};
+use std::cmp;
 use std::collections::{HashSet, HashMap, hash_map};
 use std::sync::{Arc, RwLock};
 use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
@@ -608,9 +608,7 @@ impl Store {
                                let split_point = cmp::min(cmp::min(SECS_PER_SCAN_RESULTS * state_nodes.len() as u64 / rescan_interval,
                                                        SECS_PER_SCAN_RESULTS * MAX_CONNS_PER_SEC_PER_STATUS),
                                                state_nodes.len() as u64);
-                               let mut new_nodes = state_nodes.split_off(split_point as usize);
-                               mem::swap(&mut new_nodes, state_nodes);
-                               for node in new_nodes.drain(..) {
+                               for node in state_nodes.drain(..split_point as usize) {
                                        nodes.nodes_to_state.get_mut(&node).unwrap().queued = false;
                                        res.push((&node).into());
                                }