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Added adaptive NS server selection with RTT banding.

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This commit is contained in:
Revertron
2026-03-29 18:15:06 +02:00
parent eee73be58e
commit 9624484b29
4 changed files with 114 additions and 34 deletions
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Cargo.lock
Generated
+5 -20
View File
@@ -77,7 +77,7 @@ dependencies = [
"thread-priority",
"time",
"tinyfiledialogs",
"toml 0.9.12+spec-1.1.0",
"toml 1.0.7+spec-1.1.0",
"tray-icon",
"ureq",
"uuid",
@@ -3166,17 +3166,17 @@ dependencies = [
[[package]]
name = "toml"
version = "0.9.12+spec-1.1.0"
version = "1.0.7+spec-1.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "cf92845e79fc2e2def6a5d828f0801e29a2f8acc037becc5ab08595c7d5e9863"
checksum = "dd28d57d8a6f6e458bc0b8784f8fdcc4b99a437936056fa122cb234f18656a96"
dependencies = [
"indexmap",
"serde_core",
"serde_spanned 1.0.4",
"toml_datetime 0.7.5+spec-1.1.0",
"toml_datetime 1.0.1+spec-1.1.0",
"toml_parser",
"toml_writer",
"winnow 0.7.15",
"winnow 1.0.0",
]
[[package]]
@@ -3188,15 +3188,6 @@ dependencies = [
"serde",
]
[[package]]
name = "toml_datetime"
version = "0.7.5+spec-1.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "92e1cfed4a3038bc5a127e35a2d360f145e1f4b971b551a2ba5fd7aedf7e1347"
dependencies = [
"serde_core",
]
[[package]]
name = "toml_datetime"
version = "1.0.1+spec-1.1.0"
@@ -4066,12 +4057,6 @@ dependencies = [
"memchr",
]
[[package]]
name = "winnow"
version = "0.7.15"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "df79d97927682d2fd8adb29682d1140b343be4ac0f08fd68b7765d9c059d3945"
[[package]]
name = "winnow"
version = "1.0.0"
Cargo.toml
+1 -1
View File
@@ -14,7 +14,7 @@ exclude = ["blockchain.db", "alfis.toml"]
getopts = "0.2.24"
log = "0.4.28"
simplelog = "0.12.2"
toml = "0.9.12+spec-1.1.0"
toml = "1.0.7"
sha2 = "0.10.9"
ed25519-dalek = "2.2.0"
x25519-dalek = { version = "2.0.1", features = ["reusable_secrets"] }
src/blockchain/filter.rs
+107 -12
View File
@@ -1,8 +1,11 @@
use std::collections::HashMap;
use std::net::{IpAddr, SocketAddr};
use std::sync::{Arc, Mutex};
use std::time::Instant;
#[allow(unused_imports)]
use log::{debug, error, info, trace, warn};
use rand::seq::SliceRandom;
use crate::blockchain::transaction::DomainData;
use crate::dns::filter::DnsFilter;
@@ -13,13 +16,32 @@ use crate::dns::client::{DnsClient, DnsNetworkClient};
const NAME_SERVER: &str = "ns.alfis.name";
const SERVER_ADMIN: &str = "admin.alfis.name";
/// Unbound-style RTT band width in milliseconds.
/// Servers within min_rtt + BAND are considered equally good.
const RTT_BAND_MS: f64 = 100.0;
/// EWMA smoothing factor: 87.5% history, 12.5% new measurement.
const EWMA_WEIGHT: f64 = 7.0 / 8.0;
/// Penalty RTT assigned on timeout/failure (ms).
const TIMEOUT_PENALTY_MS: f64 = 5000.0;
/// Stats older than this are expired so the server gets re-probed.
const STATS_EXPIRE_SECS: u64 = 900;
struct NsStats {
rtt: f64,
last_update: Instant,
}
pub struct BlockchainFilter {
context: Arc<Mutex<Context>>
context: Arc<Mutex<Context>>,
ns_stats: Arc<Mutex<HashMap<IpAddr, NsStats>>>,
}
impl BlockchainFilter {
pub fn new(context: Arc<Mutex<Context>>) -> Self {
BlockchainFilter { context }
BlockchainFilter {
context,
ns_stats: Arc::new(Mutex::new(HashMap::new())),
}
}
fn add_soa_record(zone: String, serial: u32, packet: &mut DnsPacket) {
@@ -44,22 +66,95 @@ impl BlockchainFilter {
have_zone
}
fn lookup_from_ns(qname: &str, qtype: QueryType, servers: &Vec<IpAddr>) -> Option<DnsPacket> {
fn lookup_from_ns(qname: &str, qtype: QueryType, servers: &[IpAddr], ns_stats: &Arc<Mutex<HashMap<IpAddr, NsStats>>>) -> Option<DnsPacket> {
let mut dns_client = DnsNetworkClient::new();
dns_client.run().unwrap();
let timeout = std::time::Duration::from_secs(5);
let timeout = std::time::Duration::from_secs(2);
for server in servers {
let addr = SocketAddr::new(server.to_owned(), 53);
if let Ok(res) = dns_client.send_udp_query(qname, qtype, addr, false, timeout) {
dns_client.stop();
return Some(res);
// Build ordered server list using RTT banding
let ordered = Self::select_servers(servers, ns_stats);
for server in &ordered {
let addr = SocketAddr::new(*server, 53);
let start = Instant::now();
match dns_client.send_udp_query(qname, qtype, addr, false, timeout) {
Ok(res) => {
let elapsed = start.elapsed().as_secs_f64() * 1000.0;
Self::update_ns_stats(ns_stats, *server, elapsed);
dns_client.stop();
return Some(res);
}
Err(_) => {
Self::update_ns_stats(ns_stats, *server, TIMEOUT_PENALTY_MS);
}
}
}
dns_client.stop();
None
}
/// Select servers using Unbound-style RTT banding.
/// Servers with no stats or expired stats are treated as preferred (to be probed).
/// Among known servers, those within min_rtt + RTT_BAND_MS are preferred.
/// Each group is shuffled, then preferred servers come first.
fn select_servers(servers: &[IpAddr], ns_stats: &Arc<Mutex<HashMap<IpAddr, NsStats>>>) -> Vec<IpAddr> {
let now = Instant::now();
let stats = ns_stats.lock().unwrap();
// Separate into known (with valid stats) and unknown
let mut known: Vec<(IpAddr, f64)> = Vec::new();
let mut unknown: Vec<IpAddr> = Vec::new();
for &ip in servers {
match stats.get(&ip) {
Some(s) if now.duration_since(s.last_update).as_secs() < STATS_EXPIRE_SECS => {
known.push((ip, s.rtt));
}
_ => {
unknown.push(ip);
}
}
}
drop(stats);
let mut rng = rand::thread_rng();
if known.is_empty() {
// No stats yet — shuffle all and probe
unknown.shuffle(&mut rng);
return unknown;
}
let min_rtt = known.iter().map(|(_, rtt)| *rtt).fold(f64::INFINITY, f64::min);
let band_threshold = min_rtt + RTT_BAND_MS;
let mut preferred: Vec<IpAddr> = Vec::new();
let mut fallback: Vec<IpAddr> = Vec::new();
for (ip, rtt) in &known {
if *rtt <= band_threshold {
preferred.push(*ip);
} else {
fallback.push(*ip);
}
}
// Unknown servers join the preferred group to get probed
preferred.extend(unknown);
preferred.shuffle(&mut rng);
fallback.shuffle(&mut rng);
preferred.extend(fallback);
preferred
}
fn update_ns_stats(ns_stats: &Arc<Mutex<HashMap<IpAddr, NsStats>>>, ip: IpAddr, rtt_ms: f64) {
let mut stats = ns_stats.lock().unwrap();
let entry = stats.entry(ip).or_insert(NsStats {
rtt: rtt_ms,
last_update: Instant::now(),
});
entry.rtt = entry.rtt * EWMA_WEIGHT + rtt_ms * (1.0 - EWMA_WEIGHT);
entry.last_update = Instant::now();
}
fn create_packet(&self, qname: &str, qtype: QueryType, zone: String, answers: Vec<DnsRecord>, ns_records: Vec<DnsRecord>, glue_records: Vec<DnsRecord>) -> Option<DnsPacket> {
if !answers.is_empty() {
// Create DnsPacket with answers
@@ -92,7 +187,7 @@ impl BlockchainFilter {
}
}
fn resolve_by_ns(qname: &str, qtype: QueryType, top_domain: &String, data: &DomainData, recursive: bool) -> (bool, Option<DnsPacket>) {
fn resolve_by_ns(qname: &str, qtype: QueryType, top_domain: &String, data: &DomainData, recursive: bool, ns_stats: &Arc<Mutex<HashMap<IpAddr, NsStats>>>) -> (bool, Option<DnsPacket>) {
// First we search for NS records, collecting nameserver domains
let mut hosts = Vec::new();
for record in data.records.iter() {
@@ -156,7 +251,7 @@ impl BlockchainFilter {
if !servers.is_empty() {
trace!("Found NS servers for domain {}: {:?}", &qname, &servers);
let answer = BlockchainFilter::lookup_from_ns(qname, qtype, &servers);
let answer = BlockchainFilter::lookup_from_ns(qname, qtype, &servers, ns_stats);
if let Some(packet) = &answer {
trace!("Resolved {:?} from NS: {:?}", (qname, qtype), &packet.answers);
}
@@ -284,7 +379,7 @@ impl DnsFilter for BlockchainFilter {
// Check if this domain has NS records and needs to resolve all records through them
// But skip this if we're querying for NS records themselves - return them directly
if qtype != QueryType::NS {
let (has_ns, result) = Self::resolve_by_ns(qname, qtype, &top_domain, &data, recursive);
let (has_ns, result) = Self::resolve_by_ns(qname, qtype, &top_domain, &data, recursive, &self.ns_stats);
if has_ns {
return result;
}
src/commons/constants.rs
+1 -1
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@@ -45,7 +45,7 @@ pub const UI_REFRESH_DELAY_MS: u128 = 500;
pub const LOG_REFRESH_DELAY_SEC: u64 = 60;
pub const POLL_TIMEOUT: Option<Duration> = Some(Duration::from_millis(200));
pub const WAIT_FOR_INTERNET: Duration = Duration::from_secs(10);
pub const WAIT_FOR_INTERNET: Duration = Duration::from_secs(5);
/// We start syncing blocks only when we got 4 and more connected nodes
pub const MIN_CONNECTED_NODES_START_SYNC: usize = 4;
pub const MAX_READ_BLOCK_TIME: u128 = 100;