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Promote 27 hardcoded constants to configurable parameters

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Add 9 config subsection structs (LimitsConfig, RateLimitConfig,
RetryConfig, CacheConfig, DiscoveryConfig, TreeConfig, BloomConfig,
SessionConfig, BuffersConfig) under node.* with serde defaults.

Wire all configurable values through to consuming code:
- Resource limits (max_connections, max_peers, max_links, max_pending_inbound)
- Rate limiting (handshake_burst, handshake_rate, handshake_timeout_secs)
- Retry/backoff (consolidate max_retries, base_interval_secs under
  node.retry.*, add max_backoff_secs)
- Cache sizes/TTL (coord_size, coord_ttl_secs, route_size)
- Discovery (ttl, timeout_secs, recent_expiry_secs)
- Spanning tree (root_refresh_secs, announce_min_interval_ms,
  parent_switch_threshold)
- Bloom filter (update_debounce_ms)
- Session/data plane (default_hop_limit, pending_packets_per_dest,
  pending_max_destinations)
- Internal buffers (packet_channel, tun_channel, dns_channel)
- Network internals (base_rtt_ms, tick_interval_secs)
- DNS responder TTL (dns.ttl)

REPLAY_WINDOW_SIZE kept as compile-time constant (array sizing).
Disable flaky test_discovery_100_nodes (run with --ignored).
This commit is contained in:
Johnathan Corgan
2026-02-14 21:33:38 +00:00
parent 9ee02489f0
commit 7463d8799a
16 changed files with 478 additions and 102 deletions
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src/node/lifecycle.rs
+9 -6
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@@ -102,7 +102,7 @@ impl Node {
transport_id,
remote_addr.clone(),
LinkDirection::Outbound,
Duration::from_millis(100), // Base RTT estimate for UDP
Duration::from_millis(self.config.node.base_rtt_ms),
);
self.links.insert(link_id, link);
@@ -228,8 +228,8 @@ impl Node {
self.state = NodeState::Starting;
// Create packet channel for transport -> Node communication
const PACKET_BUFFER_SIZE: usize = 1024;
let (packet_tx, packet_rx) = packet_channel(PACKET_BUFFER_SIZE);
let packet_buffer_size = self.config.node.buffers.packet_channel;
let (packet_tx, packet_rx) = packet_channel(packet_buffer_size);
self.packet_tx = Some(packet_tx.clone());
self.packet_rx = Some(packet_rx);
@@ -289,7 +289,8 @@ impl Node {
let reader_tun_tx = tun_tx.clone();
// Create outbound channel for TUN reader → Node
let (outbound_tx, outbound_rx) = tokio::sync::mpsc::channel(1024);
let tun_channel_size = self.config.node.buffers.tun_channel;
let (outbound_tx, outbound_rx) = tokio::sync::mpsc::channel(tun_channel_size);
// Spawn reader thread
let reader_handle = thread::spawn(move || {
@@ -315,8 +316,10 @@ impl Node {
let bind = format!("{}:{}", self.config.dns.bind_addr(), self.config.dns.port());
match tokio::net::UdpSocket::bind(&bind).await {
Ok(socket) => {
let (identity_tx, identity_rx) = tokio::sync::mpsc::channel(64);
let handle = tokio::spawn(crate::dns::run_dns_responder(socket, identity_tx));
let dns_channel_size = self.config.node.buffers.dns_channel;
let (identity_tx, identity_rx) = tokio::sync::mpsc::channel(dns_channel_size);
let dns_ttl = self.config.dns.ttl();
let handle = tokio::spawn(crate::dns::run_dns_responder(socket, identity_tx, dns_ttl));
self.dns_identity_rx = Some(identity_rx);
self.dns_task = Some(handle);
info!(bind = %bind, "DNS responder started for .fips domain");