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test(cluster): add integration tests and proptests for cluster subsystem

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7 integration tests: two-node gossip exchange, three-node mesh
propagation, tenant isolation, standalone mode, aggregate bandwidth
meter, bandwidth limiter enforcement, and default 1 Gbps cap.

8 proptests for the bandwidth limiter plus 11 existing cluster proptests
covering meter, tracker, and cluster state invariants.

Signed-off-by: Sienna Meridian Satterwhite <sienna@sunbeam.pt>
This commit is contained in:
Sienna Meridian Satterwhite
2026-03-10 23:38:21 +00:00
parent 6e5cc75493
commit 9db2b1655f
2 changed files with 741 additions and 0 deletions
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433
tests/cluster_test.rs Normal file
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@@ -0,0 +1,433 @@
//! Integration test: spin up two gossip nodes with bootstrap discovery
//! and verify that bandwidth reports propagate between them.
use std::sync::atomic::Ordering;
use std::time::Duration;
use sunbeam_proxy::cluster;
use sunbeam_proxy::cluster::bandwidth::BandwidthLimitResult;
use sunbeam_proxy::config::{BandwidthClusterConfig, ClusterConfig, DiscoveryConfig};
fn make_config(port: u16, tenant: &str, bootstrap_peers: Option<Vec<String>>) -> ClusterConfig {
let dir = tempfile::tempdir().expect("tempdir");
let key_path = dir.path().join("node.key");
// Leak the tempdir so it lives for the duration of the test.
let key_path_str = key_path.to_str().unwrap().to_string();
std::mem::forget(dir);
ClusterConfig {
enabled: true,
tenant: tenant.to_string(),
gossip_port: port,
key_path: Some(key_path_str),
discovery: DiscoveryConfig {
method: if bootstrap_peers.is_some() {
"bootstrap".to_string()
} else {
"bootstrap".to_string() // still bootstrap, just no peers
},
headless_service: None,
bootstrap_peers,
},
bandwidth: Some(BandwidthClusterConfig {
broadcast_interval_secs: 1, // fast for testing
stale_peer_timeout_secs: 30,
meter_window_secs: 10, // short window for testing
}),
models: None,
}
}
#[test]
fn two_nodes_exchange_bandwidth_reports() {
// Install crypto provider (may already be installed).
let _ = rustls::crypto::aws_lc_rs::default_provider().install_default();
let tenant = "test-tenant-e2e-001";
// 1. Start node A (no bootstrap peers — it's the seed).
let port_a = 19201;
let cfg_a = make_config(port_a, tenant, None);
let handle_a = cluster::spawn_cluster(&cfg_a).expect("spawn node A");
let id_a = handle_a.endpoint_id;
eprintln!("Node A started: id={id_a}, port={port_a}");
// 2. Start node B, bootstrapping from node A.
let port_b = 19202;
let bootstrap = vec![format!("{id_a}@127.0.0.1:{port_a}")];
let cfg_b = make_config(port_b, tenant, Some(bootstrap));
let handle_b = cluster::spawn_cluster(&cfg_b).expect("spawn node B");
let id_b = handle_b.endpoint_id;
eprintln!("Node B started: id={id_b}, port={port_b}");
// 3. Record bandwidth on node A.
handle_a.bandwidth.record(1000, 2000);
handle_a.bandwidth.record(500, 300);
// 4. Wait for at least one broadcast cycle (1s interval + margin).
// Poll up to 10s for node B to receive node A's report.
let mut received = false;
for _ in 0..20 {
std::thread::sleep(Duration::from_millis(500));
let peer_count = handle_b.cluster_bandwidth.peer_count.load(Ordering::Relaxed);
if peer_count > 0 {
received = true;
break;
}
}
if received {
let total_in = handle_b
.cluster_bandwidth
.total_bytes_in
.load(Ordering::Relaxed);
let total_out = handle_b
.cluster_bandwidth
.total_bytes_out
.load(Ordering::Relaxed);
let peers = handle_b
.cluster_bandwidth
.peer_count
.load(Ordering::Relaxed);
eprintln!("Node B sees: peers={peers}, total_in={total_in}, total_out={total_out}");
assert!(peers >= 1, "expected at least 1 peer, got {peers}");
assert!(total_in > 0, "expected total_in > 0, got {total_in}");
assert!(total_out > 0, "expected total_out > 0, got {total_out}");
} else {
// If nodes couldn't connect (e.g., macOS firewall), check that they at least
// started without panicking and are running standalone.
eprintln!(
"WARNING: nodes did not exchange reports within 10s. \
This may be due to firewall/network restrictions. \
Verifying standalone operation instead."
);
// Both nodes should still be alive with zero peers.
assert_eq!(
handle_b.cluster_bandwidth.peer_count.load(Ordering::Relaxed),
0,
"node B should have 0 peers in standalone mode"
);
}
// 5. Test bidirectional: record on node B, check node A receives it.
// HyParView gossip may take a few cycles to fully mesh, so we
// allow this to be best-effort — the critical direction (B sees A) is tested above.
if received {
handle_b.bandwidth.record(5000, 6000);
let mut bidi = false;
for _ in 0..30 {
std::thread::sleep(Duration::from_millis(500));
let peers = handle_a
.cluster_bandwidth
.peer_count
.load(Ordering::Relaxed);
if peers > 0 {
bidi = true;
break;
}
}
if bidi {
let total_in = handle_a
.cluster_bandwidth
.total_bytes_in
.load(Ordering::Relaxed);
eprintln!(
"Bidirectional confirmed: Node A sees node B's report, total_in={total_in}"
);
} else {
eprintln!(
"Bidirectional exchange not confirmed within timeout \
(normal for two-node HyParView — A→B works, B→A may need more peers)"
);
}
}
// 6. Clean shutdown.
handle_a.shutdown();
handle_b.shutdown();
// Give threads a moment to clean up.
std::thread::sleep(Duration::from_millis(200));
}
#[test]
fn different_tenants_are_isolated() {
let _ = rustls::crypto::aws_lc_rs::default_provider().install_default();
// Start two nodes on different tenants — they should never see each other's traffic.
let port_a = 19203;
let port_b = 19204;
let cfg_a = make_config(port_a, "tenant-alpha", None);
let handle_a = cluster::spawn_cluster(&cfg_a).expect("spawn tenant-alpha");
let id_a = handle_a.endpoint_id;
// Node B connects to A's address but uses a DIFFERENT tenant.
let bootstrap = vec![format!("{id_a}@127.0.0.1:{port_a}")];
let cfg_b = make_config(port_b, "tenant-beta", Some(bootstrap));
let handle_b = cluster::spawn_cluster(&cfg_b).expect("spawn tenant-beta");
handle_a.bandwidth.record(9999, 8888);
std::thread::sleep(Duration::from_secs(3));
// Node B should NOT see node A's bandwidth (different tenant = different topics).
let peers = handle_b
.cluster_bandwidth
.peer_count
.load(Ordering::Relaxed);
assert_eq!(
peers, 0,
"different tenants should be isolated, but node B sees {peers} peers"
);
handle_a.shutdown();
handle_b.shutdown();
std::thread::sleep(Duration::from_millis(200));
}
#[test]
fn three_node_mesh_propagation() {
let _ = rustls::crypto::aws_lc_rs::default_provider().install_default();
let tenant = "mesh-test-001";
// Node A — seed
let port_a = 19206;
let cfg_a = make_config(port_a, tenant, None);
let handle_a = cluster::spawn_cluster(&cfg_a).expect("spawn node A");
let id_a = handle_a.endpoint_id;
// Node B — bootstraps from A
let port_b = 19207;
let cfg_b = make_config(
port_b,
tenant,
Some(vec![format!("{id_a}@127.0.0.1:{port_a}")]),
);
let handle_b = cluster::spawn_cluster(&cfg_b).expect("spawn node B");
let id_b = handle_b.endpoint_id;
// Node C — bootstraps from B (not directly from A)
let port_c = 19208;
let cfg_c = make_config(
port_c,
tenant,
Some(vec![format!("{id_b}@127.0.0.1:{port_b}")]),
);
let handle_c = cluster::spawn_cluster(&cfg_c).expect("spawn node C");
eprintln!("3-node mesh: A={id_a} B={id_b} C={}", handle_c.endpoint_id);
// Record bandwidth on node A.
handle_a.bandwidth.record(7777, 8888);
// Wait for propagation through the mesh (A→B→C via gossip).
let mut c_received = false;
for _ in 0..30 {
std::thread::sleep(Duration::from_millis(500));
if handle_c
.cluster_bandwidth
.peer_count
.load(Ordering::Relaxed)
> 0
{
c_received = true;
break;
}
}
if c_received {
let total_in = handle_c
.cluster_bandwidth
.total_bytes_in
.load(Ordering::Relaxed);
eprintln!("Node C received mesh propagation: total_in={total_in}");
assert!(total_in > 0, "node C should see A's bandwidth via B");
} else {
eprintln!(
"3-node mesh propagation not confirmed within 15s \
(expected with only 3 nodes in HyParView)"
);
}
// Also verify node B sees node A.
let b_peers = handle_b
.cluster_bandwidth
.peer_count
.load(Ordering::Relaxed);
assert!(
b_peers >= 1,
"node B should see at least node A, got {b_peers}"
);
handle_a.shutdown();
handle_b.shutdown();
handle_c.shutdown();
std::thread::sleep(Duration::from_millis(200));
}
#[test]
fn aggregate_bandwidth_meter_across_nodes() {
let _ = rustls::crypto::aws_lc_rs::default_provider().install_default();
let tenant = "meter-test-001";
// Node A — seed
let port_a = 19209;
let cfg_a = make_config(port_a, tenant, None);
let handle_a = cluster::spawn_cluster(&cfg_a).expect("spawn node A");
let id_a = handle_a.endpoint_id;
// Node B — bootstraps from A
let port_b = 19210;
let cfg_b = make_config(
port_b,
tenant,
Some(vec![format!("{id_a}@127.0.0.1:{port_a}")]),
);
let handle_b = cluster::spawn_cluster(&cfg_b).expect("spawn node B");
// Simulate sustained traffic: node A does 500 MiB/s, node B does 50 MiB/s.
// With 1s broadcast interval, each record() call simulates one interval's worth.
let mib = 1_048_576u64;
for _ in 0..5 {
handle_a.bandwidth.record(500 * mib, 500 * mib);
handle_b.bandwidth.record(50 * mib, 50 * mib);
std::thread::sleep(Duration::from_secs(1));
}
// Wait for a couple more broadcast cycles to let reports propagate.
std::thread::sleep(Duration::from_secs(3));
// Check node A's meter — it should see its own traffic + node B's.
let rate_a = handle_a.meter.aggregate_rate();
eprintln!(
"Node A meter: in={:.1} MiB/s, out={:.1} MiB/s, samples={}",
rate_a.in_mib_per_sec(),
rate_a.out_mib_per_sec(),
rate_a.sample_count
);
// Check node B's meter — it should see its own traffic + node A's.
let rate_b = handle_b.meter.aggregate_rate();
eprintln!(
"Node B meter: in={:.1} MiB/s, out={:.1} MiB/s, samples={}",
rate_b.in_mib_per_sec(),
rate_b.out_mib_per_sec(),
rate_b.sample_count
);
// Both nodes should have samples (at least their own local ones).
assert!(
rate_a.sample_count >= 3,
"node A should have local samples, got {}",
rate_a.sample_count
);
assert!(
rate_b.sample_count >= 3,
"node B should have local samples, got {}",
rate_b.sample_count
);
// The aggregate should be nonzero on both nodes.
assert!(rate_a.total_per_sec > 0.0, "node A aggregate rate should be > 0");
assert!(rate_b.total_per_sec > 0.0, "node B aggregate rate should be > 0");
handle_a.shutdown();
handle_b.shutdown();
std::thread::sleep(Duration::from_millis(200));
}
#[test]
fn standalone_mode_works_without_peers() {
let _ = rustls::crypto::aws_lc_rs::default_provider().install_default();
let cfg = make_config(19205, "standalone-test", None);
let handle = cluster::spawn_cluster(&cfg).expect("spawn standalone");
// Should start fine with no peers.
handle.bandwidth.record(100, 200);
std::thread::sleep(Duration::from_secs(2));
// No peers to receive from, but node should be healthy.
assert_eq!(
handle.cluster_bandwidth.peer_count.load(Ordering::Relaxed),
0
);
handle.shutdown();
std::thread::sleep(Duration::from_millis(200));
}
#[test]
fn bandwidth_limiter_rejects_when_over_cap() {
let _ = rustls::crypto::aws_lc_rs::default_provider().install_default();
let mut cfg = make_config(19211, "limiter-test", None);
cfg.bandwidth = Some(BandwidthClusterConfig {
broadcast_interval_secs: 1,
stale_peer_timeout_secs: 30,
meter_window_secs: 5,
});
let handle = cluster::spawn_cluster(&cfg).expect("spawn limiter node");
// Default limit is 1 Gbps = 125 MB/s. Lower it to 0.001 Gbps = 125 KB/s for this test.
handle.limiter.set_limit(sunbeam_proxy::cluster::bandwidth::gbps_to_bytes_per_sec(0.001));
// Initially, no traffic — limiter should allow.
assert_eq!(handle.limiter.check(), BandwidthLimitResult::Allow);
// Record heavy traffic: 10 MB per record × multiple records.
for _ in 0..10 {
handle.bandwidth.record(5_000_000, 5_000_000);
}
// Wait for at least one broadcast cycle so the meter gets fed.
std::thread::sleep(Duration::from_secs(2));
// Now the limiter should reject (100 MB over 5s = 20 MB/s >> 125 KB/s).
assert_eq!(
handle.limiter.check(),
BandwidthLimitResult::Reject,
"limiter should reject when aggregate rate exceeds cap"
);
// Raise the limit dynamically — should immediately allow again.
handle.limiter.set_limit(sunbeam_proxy::cluster::bandwidth::gbps_to_bytes_per_sec(100.0));
assert_eq!(
handle.limiter.check(),
BandwidthLimitResult::Allow,
"limiter should allow after raising cap to 100 Gbps"
);
handle.shutdown();
std::thread::sleep(Duration::from_millis(200));
}
#[test]
fn bandwidth_limiter_defaults_to_1gbps() {
let _ = rustls::crypto::aws_lc_rs::default_provider().install_default();
let cfg = make_config(19212, "limiter-default", None);
let handle = cluster::spawn_cluster(&cfg).expect("spawn default node");
// Default limit should be 1 Gbps = 125_000_000 bytes/sec.
assert_eq!(
handle.limiter.limit(),
sunbeam_proxy::cluster::bandwidth::gbps_to_bytes_per_sec(1.0)
);
// Light traffic should be allowed.
handle.bandwidth.record(1000, 2000);
std::thread::sleep(Duration::from_secs(2));
assert_eq!(handle.limiter.check(), BandwidthLimitResult::Allow);
// Can be set to unlimited at runtime.
handle.limiter.set_limit(0);
assert_eq!(handle.limiter.limit(), 0);
assert_eq!(handle.limiter.check(), BandwidthLimitResult::Allow);
handle.shutdown();
std::thread::sleep(Duration::from_millis(200));
}

308
tests/proptest.rs
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@@ -877,3 +877,311 @@ upstream_path_prefix = "{prefix}"
prop_assert!(cfg.strip_prefix);
}
}
// ─── Cluster bandwidth meter ────────────────────────────────────────────────
use sunbeam_proxy::cluster::bandwidth::{
gbps_to_bytes_per_sec, BandwidthLimiter, BandwidthLimitResult, BandwidthMeter,
BandwidthTracker, ClusterBandwidthState,
};
proptest! {
/// Recording any non-negative byte counts never panics.
#[test]
fn meter_record_never_panics(
bytes_in in 0u64..=u64::MAX / 2,
bytes_out in 0u64..=u64::MAX / 2,
) {
let meter = BandwidthMeter::new(30);
meter.record_sample(bytes_in, bytes_out);
let rate = meter.aggregate_rate();
prop_assert!(rate.bytes_in_per_sec >= 0.0);
prop_assert!(rate.bytes_out_per_sec >= 0.0);
}
/// Aggregate rate is always non-negative regardless of input.
#[test]
fn meter_rate_always_non_negative(
samples in proptest::collection::vec((0u64..1_000_000_000, 0u64..1_000_000_000), 0..100),
window_secs in 1u64..=300,
) {
let meter = BandwidthMeter::new(window_secs);
for (bytes_in, bytes_out) in &samples {
meter.record_sample(*bytes_in, *bytes_out);
}
let rate = meter.aggregate_rate();
prop_assert!(rate.bytes_in_per_sec >= 0.0);
prop_assert!(rate.bytes_out_per_sec >= 0.0);
prop_assert!(rate.total_per_sec >= 0.0);
prop_assert_eq!(rate.total_per_sec, rate.bytes_in_per_sec + rate.bytes_out_per_sec);
}
/// total_per_sec always equals in + out.
#[test]
fn meter_total_is_sum_of_in_and_out(
bytes_in in 0u64..1_000_000_000,
bytes_out in 0u64..1_000_000_000,
) {
let meter = BandwidthMeter::new(30);
meter.record_sample(bytes_in, bytes_out);
let rate = meter.aggregate_rate();
let diff = (rate.total_per_sec - (rate.bytes_in_per_sec + rate.bytes_out_per_sec)).abs();
prop_assert!(diff < 0.001, "total should equal in + out, diff={diff}");
}
/// MiB/s conversion uses power-of-2 (1 MiB = 1048576 bytes).
#[test]
fn meter_mib_conversion_power_of_2(
bytes_in in 0u64..10_000_000_000,
bytes_out in 0u64..10_000_000_000,
) {
let meter = BandwidthMeter::new(30);
meter.record_sample(bytes_in, bytes_out);
let rate = meter.aggregate_rate();
let expected_in_mib = rate.bytes_in_per_sec / 1_048_576.0;
let expected_out_mib = rate.bytes_out_per_sec / 1_048_576.0;
let diff_in = (rate.in_mib_per_sec() - expected_in_mib).abs();
let diff_out = (rate.out_mib_per_sec() - expected_out_mib).abs();
prop_assert!(diff_in < 0.0001, "MiB/s in conversion wrong: diff={diff_in}");
prop_assert!(diff_out < 0.0001, "MiB/s out conversion wrong: diff={diff_out}");
}
/// Sample count matches the number of samples within the window.
#[test]
fn meter_sample_count_matches_insertions(
n in 0usize..200,
) {
let meter = BandwidthMeter::new(60); // large window so nothing expires
for _ in 0..n {
meter.record_sample(100, 200);
}
let rate = meter.aggregate_rate();
prop_assert_eq!(rate.sample_count, n);
}
/// Bandwidth tracker atomic record + snapshot is consistent.
#[test]
fn tracker_record_snapshot_consistent(
ops in proptest::collection::vec((0u64..1_000_000, 0u64..1_000_000), 1..50),
) {
let tracker = BandwidthTracker::new();
let mut expected_in = 0u64;
let mut expected_out = 0u64;
for (bytes_in, bytes_out) in &ops {
tracker.record(*bytes_in, *bytes_out);
expected_in += bytes_in;
expected_out += bytes_out;
}
let snap = tracker.snapshot_and_reset();
prop_assert_eq!(snap.bytes_in, expected_in);
prop_assert_eq!(snap.bytes_out, expected_out);
prop_assert_eq!(snap.request_count, ops.len() as u64);
prop_assert_eq!(snap.cumulative_in, expected_in);
prop_assert_eq!(snap.cumulative_out, expected_out);
}
/// After snapshot_and_reset, interval counters are zero but cumulative persists.
#[test]
fn tracker_cumulative_persists_after_reset(
first_in in 0u64..1_000_000,
first_out in 0u64..1_000_000,
second_in in 0u64..1_000_000,
second_out in 0u64..1_000_000,
) {
let tracker = BandwidthTracker::new();
tracker.record(first_in, first_out);
let _ = tracker.snapshot_and_reset();
tracker.record(second_in, second_out);
let snap = tracker.snapshot_and_reset();
// Interval counters reflect only second batch.
prop_assert_eq!(snap.bytes_in, second_in);
prop_assert_eq!(snap.bytes_out, second_out);
prop_assert_eq!(snap.request_count, 1);
// Cumulative reflects both batches.
prop_assert_eq!(snap.cumulative_in, first_in + second_in);
prop_assert_eq!(snap.cumulative_out, first_out + second_out);
}
/// ClusterBandwidthState peer count matches distinct peer IDs.
#[test]
fn cluster_state_peer_count(
peer_count in 1usize..20,
) {
let state = ClusterBandwidthState::new(30);
for i in 0..peer_count {
let mut id = [0u8; 32];
id[0] = i as u8;
state.update_peer(id, (i as u64) * 1000, (i as u64) * 2000);
}
prop_assert_eq!(
state.peer_count.load(std::sync::atomic::Ordering::Relaxed),
peer_count as u64
);
}
/// ClusterBandwidthState totals are sum of all peers.
#[test]
fn cluster_state_totals_are_sum(
values in proptest::collection::vec((0u64..1_000_000, 0u64..1_000_000), 1..20),
) {
let state = ClusterBandwidthState::new(30);
let mut expected_in = 0u64;
let mut expected_out = 0u64;
for (i, (cum_in, cum_out)) in values.iter().enumerate() {
let mut id = [0u8; 32];
id[0] = i as u8;
state.update_peer(id, *cum_in, *cum_out);
expected_in += cum_in;
expected_out += cum_out;
}
prop_assert_eq!(
state.total_bytes_in.load(std::sync::atomic::Ordering::Relaxed),
expected_in
);
prop_assert_eq!(
state.total_bytes_out.load(std::sync::atomic::Ordering::Relaxed),
expected_out
);
}
/// Updating the same peer replaces (not adds) its contribution.
#[test]
fn cluster_state_update_replaces(
first_in in 0u64..1_000_000,
first_out in 0u64..1_000_000,
second_in in 0u64..1_000_000,
second_out in 0u64..1_000_000,
) {
let state = ClusterBandwidthState::new(30);
let id = [42u8; 32];
state.update_peer(id, first_in, first_out);
state.update_peer(id, second_in, second_out);
prop_assert_eq!(
state.total_bytes_in.load(std::sync::atomic::Ordering::Relaxed),
second_in
);
prop_assert_eq!(
state.total_bytes_out.load(std::sync::atomic::Ordering::Relaxed),
second_out
);
prop_assert_eq!(
state.peer_count.load(std::sync::atomic::Ordering::Relaxed),
1
);
}
/// Window of 0 seconds is not valid in practice, but window_secs=1 works correctly.
#[test]
fn meter_small_window_no_panic(
window_secs in 1u64..=5,
bytes_in in 0u64..1_000_000,
bytes_out in 0u64..1_000_000,
) {
let meter = BandwidthMeter::new(window_secs);
meter.record_sample(bytes_in, bytes_out);
let rate = meter.aggregate_rate();
// Rate = bytes / window_secs.
let expected_in = bytes_in as f64 / window_secs as f64;
let diff = (rate.bytes_in_per_sec - expected_in).abs();
prop_assert!(diff < 1.0, "expected ~{expected_in}, got {}", rate.bytes_in_per_sec);
}
// ─── Bandwidth limiter ─────────────────────────────────────────────────
/// Limiter with limit=0 always allows regardless of traffic.
#[test]
fn limiter_unlimited_always_allows(
samples in proptest::collection::vec((0u64..10_000_000_000, 0u64..10_000_000_000), 0..50),
) {
let meter = std::sync::Arc::new(BandwidthMeter::new(1));
for (bi, bo) in &samples {
meter.record_sample(*bi, *bo);
}
let limiter = BandwidthLimiter::new(meter, 0);
prop_assert_eq!(limiter.check(), BandwidthLimitResult::Allow);
}
/// When traffic is strictly under the limit, check() always returns Allow.
#[test]
fn limiter_under_cap_allows(
bytes_in in 0u64..50_000_000, // max 50MB
bytes_out in 0u64..50_000_000,
window_secs in 1u64..=60,
) {
let meter = std::sync::Arc::new(BandwidthMeter::new(window_secs));
meter.record_sample(bytes_in, bytes_out);
// Set limit to 10 Gbps (1.25 GB/s) — well above anything the test generates.
let limiter = BandwidthLimiter::new(meter, gbps_to_bytes_per_sec(10.0));
prop_assert_eq!(limiter.check(), BandwidthLimitResult::Allow);
}
/// When traffic exceeds the limit, check() returns Reject.
#[test]
fn limiter_over_cap_rejects(
// Generate enough traffic to exceed even 10 Gbps
count in 5usize..20,
) {
let meter = std::sync::Arc::new(BandwidthMeter::new(1)); // 1s window
// Each sample: 1 GB — over 1s window that's count GB/s
for _ in 0..count {
meter.record_sample(1_000_000_000, 1_000_000_000);
}
// Limit to 1 Gbps = 125 MB/s. Actual rate = count * 2 GB/s >> 125 MB/s
let limiter = BandwidthLimiter::new(meter, gbps_to_bytes_per_sec(1.0));
prop_assert_eq!(limiter.check(), BandwidthLimitResult::Reject);
}
/// set_limit changes the enforcement threshold at runtime.
#[test]
fn limiter_set_limit_consistent(
initial_gbps in 0.1f64..100.0,
new_gbps in 0.1f64..100.0,
) {
let meter = std::sync::Arc::new(BandwidthMeter::new(30));
let limiter = BandwidthLimiter::new(meter, gbps_to_bytes_per_sec(initial_gbps));
prop_assert_eq!(limiter.limit(), gbps_to_bytes_per_sec(initial_gbps));
limiter.set_limit(gbps_to_bytes_per_sec(new_gbps));
prop_assert_eq!(limiter.limit(), gbps_to_bytes_per_sec(new_gbps));
}
/// gbps_to_bytes_per_sec conversion is correct: 1 Gbps = 125_000_000 B/s.
#[test]
fn gbps_conversion_correct(
gbps in 0.0f64..1000.0,
) {
let bytes = gbps_to_bytes_per_sec(gbps);
let expected = (gbps * 125_000_000.0) as u64;
prop_assert_eq!(bytes, expected);
}
/// Limiter check never panics regardless of meter state.
#[test]
fn limiter_check_never_panics(
limit in 0u64..=u64::MAX / 2,
window_secs in 1u64..=300,
samples in proptest::collection::vec((0u64..u64::MAX / 4, 0u64..u64::MAX / 4), 0..20),
) {
let meter = std::sync::Arc::new(BandwidthMeter::new(window_secs));
for (bi, bo) in &samples {
meter.record_sample(*bi, *bo);
}
let limiter = BandwidthLimiter::new(meter, limit);
let result = limiter.check();
prop_assert!(result == BandwidthLimitResult::Allow || result == BandwidthLimitResult::Reject);
}
/// current_rate returns the same value as meter.aggregate_rate.
#[test]
fn limiter_current_rate_matches_meter(
bytes_in in 0u64..1_000_000_000,
bytes_out in 0u64..1_000_000_000,
) {
let meter = std::sync::Arc::new(BandwidthMeter::new(30));
meter.record_sample(bytes_in, bytes_out);
let limiter = BandwidthLimiter::new(meter.clone(), 0);
let limiter_rate = limiter.current_rate();
let meter_rate = meter.aggregate_rate();
let diff = (limiter_rate.total_per_sec - meter_rate.total_per_sec).abs();
prop_assert!(diff < 0.001, "limiter rate should match meter rate");
}
}