From: Matt Corallo <git@bluematt.me>
Date: Thu, 15 Oct 2020 17:05:34 +0000 (-0400)
Subject: Fewer full vec allocations
X-Git-Url: http://git.bitcoin.ninja/?a=commitdiff_plain;h=ca19f8036d82bcc7a4100219bad3f16b9a91d69a;p=dnsseed-rust

Fewer full vec allocations
---

diff --git a/src/datastore.rs b/src/datastore.rs
index 6f43458..90ebbd9 100644
--- 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());
 				}