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Make generate_test_routes deterministic based on its seed #3754

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merged 1 commit into from
Apr 29, 2025
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Make generate_test_routes deterministic based on its seed #3754

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14 changes: 9 additions & 5 deletions lightning/src/routing/router.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -8843,16 +8843,20 @@ pub(crate) mod bench_utils {
let payer = payer_pubkey();
let random_seed_bytes = [42; 32];

let nodes = graph.read_only().nodes().clone();
let mut nodes = graph.read_only().nodes().clone();
let mut route_endpoints = Vec::new();
for _ in 0..route_count {
loop {
seed = seed.overflowing_mul(6364136223846793005).0.overflowing_add(1).0;
let src = PublicKey::from_slice(nodes.unordered_keys()
.skip((seed as usize) % nodes.len()).next().unwrap().as_slice()).unwrap();
let src_idx = (seed as usize) % nodes.len();
let src_key = nodes.range(..).skip(src_idx).next().unwrap().0;
let src = PublicKey::from_slice(src_key.as_slice()).unwrap();

seed = seed.overflowing_mul(6364136223846793005).0.overflowing_add(1).0;
let dst = PublicKey::from_slice(nodes.unordered_keys()
.skip((seed as usize) % nodes.len()).next().unwrap().as_slice()).unwrap();
let dst_idx = (seed as usize) % nodes.len();
let dst_key = nodes.range(..).skip(dst_idx).next().unwrap().0;
let dst = PublicKey::from_slice(dst_key.as_slice()).unwrap();

let params = PaymentParameters::from_node_id(dst, 42)
.with_bolt11_features(features.clone()).unwrap();
let first_hop = first_hop(src);
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