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//! Changes passed on in a full mesh (`swarm::relay`) to the members the writer can't
//! reach: those on none of its transports.
use std::time::Duration;
use serde_json::json;
use super::{SYNC_REPLY_TIMEOUT, Sim, read, write};
use crate::state::Timing;
use crate::swarm::bootstrap::Start;
use crate::swarm::topology;
use crate::transport::sim::DELIVERY_LIMIT;
const SOON: Duration = Duration::from_secs(30);
/// a on `sim` alone, c on `sim2` alone, b on both; a full mesh at each (every member
/// it reaches is its neighbour), so a pushes its write to b alone, and b, which only
/// received it, must announce it to c. With a long keepalive, the regular STATUS (every
/// third keepalive, 15 s) can't be what brings it: c has it within a second (an
/// announcement waits 200 ms, then c pulls). Without the announcement, a STATUS that
/// happens to fall into that second would pass it too, once in about 15 runs.
#[tokio::test(flavor = "multi_thread", worker_threads = 4)]
async fn changes_reach_members_the_writer_cant_reach_at_once() {
let keepalive = Duration::from_secs(5);
let slow = move |config: &mut crate::node::NodeConfig| {
config.timing = Timing::new(keepalive, SYNC_REPLY_TIMEOUT, DELIVERY_LIMIT);
};
let sim = Sim::with_identity(62);
let a = sim.start_on_with("a", &["sim"], &[], Start::Genesis, slow);
let b = sim.start_on_with("b", &["sim", "sim2"], &["a"], Start::Join, slow);
let c = sim.start_on_with("c", &["sim2"], &["b"], Start::Join, slow);
sim.wait_ready(&[&a, &b, &c], SOON).await;
let c_id = c.local_id().to_owned();
{
let (a, b, c_id) = (&a, &b, c_id.clone());
sim.wait_until(
"a and b know their neighbours, a full mesh, c beyond a's reach",
SOON,
move || {
let c_id = c_id.clone();
async move {
topology::view_known(a)
&& topology::view_known(b)
&& topology::is_full_mesh(a)
&& topology::is_full_mesh(b)
&& topology::is_neighbour(b, &c_id)
&& topology::transports_of(a, &c_id).contains("sim2")
&& !a.transport.can_reach(&c_id)
}
},
)
.await;
}
sim.wait_converged(&[&a, &b, &c], SOON).await;
write(&a, "x", json!(1)).await;
{
let c = &c;
sim.wait_until(
"c has a's write within a second",
Duration::from_secs(1),
move || async move { read(c, "x").await == Some(json!(1)) },
)
.await;
}
}
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