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Discovery wire format cleanup

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Drop origin_coords from LookupRequest — unused since reverse-path
routing became primary. Saves 2+16*depth bytes per request.

Wire up min_mtu: populated from TUN MTU config (default 1280) at
origination. Transit nodes skip peers whose link MTU is below the
request's min_mtu requirement. path_mtu on LookupResponse was
already wired (transit min() applied).

Add TLV extension to LookupRequest (after min_mtu) and
LookupResponse (after proof). Uses same TlvEntry format as
negotiation. Transit nodes forward TLV bytes verbatim.
This commit is contained in:
Johnathan Corgan
2026-04-11 08:16:01 +00:00
parent 4aded9a238
commit e06015dd43
3 changed files with 245 additions and 74 deletions
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src/node/tests/discovery.rs
+7 -16
View File
@@ -32,9 +32,8 @@ async fn test_request_dedup() {
let from = make_node_addr(0xAA);
let target = make_node_addr(0xBB);
let origin = make_node_addr(0xCC);
let coords = TreeCoordinate::from_addrs(vec![origin, make_node_addr(0)]).unwrap();
let request = LookupRequest::new(999, target, origin, coords, 5, 0);
let request = LookupRequest::new(999, target, origin, 5, 0);
let payload = &request.encode()[1..]; // skip msg_type byte
// First request: accepted
@@ -52,10 +51,9 @@ async fn test_request_target_is_self() {
let from = make_node_addr(0xAA);
let origin = make_node_addr(0xCC);
let my_addr = *node.node_addr();
let coords = TreeCoordinate::from_addrs(vec![origin, make_node_addr(0)]).unwrap();
// Request targeting us
let request = LookupRequest::new(777, my_addr, origin, coords, 5, 0);
let request = LookupRequest::new(777, my_addr, origin, 5, 0);
let payload = &request.encode()[1..];
// Should succeed without panic (response send will fail silently
@@ -70,9 +68,8 @@ async fn test_request_ttl_zero_not_forwarded() {
let from = make_node_addr(0xAA);
let target = make_node_addr(0xBB);
let origin = make_node_addr(0xCC);
let coords = TreeCoordinate::from_addrs(vec![origin, make_node_addr(0)]).unwrap();
let request = LookupRequest::new(666, target, origin, coords, 0, 0);
let request = LookupRequest::new(666, target, origin, 0, 0);
let payload = &request.encode()[1..];
node.handle_lookup_request(&from, payload).await;
@@ -331,8 +328,7 @@ async fn test_recent_request_expiry() {
// Trigger purge via a new lookup request
let target = make_node_addr(0xBB);
let origin = make_node_addr(0xCC);
let coords = TreeCoordinate::from_addrs(vec![origin, make_node_addr(0)]).unwrap();
let request = LookupRequest::new(789, target, origin, coords, 3, 0);
let request = LookupRequest::new(789, target, origin, 3, 0);
let payload = &request.encode()[1..];
node.handle_lookup_request(&make_node_addr(0xAA), payload)
.await;
@@ -357,10 +353,8 @@ async fn test_request_forwarding_two_node() {
let node0_addr = *nodes[0].node.node_addr();
let target = *nodes[1].node.node_addr(); // target node1 (in bloom filters)
let root = make_node_addr(0);
let coords = TreeCoordinate::from_addrs(vec![node0_addr, root]).unwrap();
let request = LookupRequest::new(42, target, node0_addr, coords, 5, 0);
let request = LookupRequest::new(42, target, node0_addr, 5, 0);
let payload = &request.encode()[1..];
// Handle on node0 as if we received it from outside
@@ -481,10 +475,8 @@ async fn test_request_dedup_convergent_paths() {
let node0_addr = *nodes[0].node.node_addr();
let target = *nodes[2].node.node_addr(); // target node2 (in bloom filters)
let root = make_node_addr(0);
let coords = TreeCoordinate::from_addrs(vec![node0_addr, root]).unwrap();
let request = LookupRequest::new(300, target, node0_addr, coords, 5, 0);
let request = LookupRequest::new(300, target, node0_addr, 5, 0);
let payload = &request.encode()[1..];
// Node0 handles the request (forwards to peers whose bloom filter
@@ -841,9 +833,8 @@ async fn test_request_min_mtu_preserved_through_encode_decode() {
// Verify min_mtu survives encode/decode in the handler test context
let target = make_node_addr(0xBB);
let origin = make_node_addr(0xCC);
let coords = TreeCoordinate::from_addrs(vec![origin, make_node_addr(0)]).unwrap();
let request = LookupRequest::new(100, target, origin, coords, 5, 1386);
let request = LookupRequest::new(100, target, origin, 5, 1386);
let encoded = request.encode();
let decoded = LookupRequest::decode(&encoded[1..]).unwrap();
assert_eq!(decoded.min_mtu, 1386);