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//! A testing implementation of [`NetDirProvider`].
use std::sync::{Arc, Mutex};
use crate::{DirEvent, Error, NetDir, NetDirProvider, Result};
use postage::broadcast::{self, Receiver, Sender};
use postage::sink::Sink as _;
/// Helper implementation of a [`NetDirProvider`].
///
/// A [`TestNetDirProvider`] can be used to provide a netdir in a single
/// situation that requires a [`NetDirProvider`].
///
/// It notifies its owner of changes
/// by firing a [`NewConsensus`](DirEvent::NewConsensus) event
/// each time [`TestNetDirProvider::set_netdir_and_notify`] is called.
///
/// Calling [`TestNetDirProvider::set_netdir`] will **not** trigger a notification.
#[derive(Debug)]
pub struct TestNetDirProvider {
/// The mutable inner state.
inner: Mutex<Inner>,
}
/// The inner part of a TestNetDirProvider.
#[derive(Debug)]
struct Inner {
/// The latest netdir that this will return.
current: Option<Arc<NetDir>>,
/// The event sender, which fires every time the netdir is updated.
event_tx: Sender<DirEvent>,
/// The event receiver.
_event_rx: Receiver<DirEvent>,
}
#[allow(clippy::new_without_default)]
impl TestNetDirProvider {
/// Create a new [`TestNetDirProvider`] with no netdir available.
pub fn new() -> Self {
let (event_tx, _event_rx) = broadcast::channel(128);
let inner = Inner {
current: None,
event_tx,
_event_rx,
};
Self {
inner: Mutex::new(inner),
}
}
/// Replace the `NetDir` in this [`TestNetDirProvider`].
pub fn set_netdir(&self, dir: impl Into<Arc<NetDir>>) {
let mut inner = self.inner.lock().expect("lock poisoned");
inner.current = Some(dir.into());
}
/// Replace the `NetDir` in this [`TestNetDirProvider`],
/// firing a [`NewConsensus`](DirEvent::NewConsensus) event.
pub async fn set_netdir_and_notify(&self, dir: impl Into<Arc<NetDir>>) {
let mut event_tx = {
let mut inner = self.inner.lock().expect("lock poisoned");
inner.current = Some(dir.into());
inner.event_tx.clone()
};
event_tx
.send(DirEvent::NewConsensus)
.await
.expect("receivers were dropped");
}
}
impl From<NetDir> for TestNetDirProvider {
fn from(nd: NetDir) -> Self {
let rv = Self::new();
rv.set_netdir(nd);
rv
}
}
impl NetDirProvider for TestNetDirProvider {
fn netdir(&self, _timeliness: crate::Timeliness) -> Result<Arc<NetDir>> {
match self.inner.lock().expect("lock poisoned").current.as_ref() {
Some(netdir) => Ok(Arc::clone(netdir)),
None => Err(Error::NoInfo),
}
}
fn events(&self) -> futures::stream::BoxStream<'static, DirEvent> {
let inner = self.inner.lock().expect("lock poisoned");
let events = inner.event_tx.subscribe();
Box::pin(events)
}
fn params(&self) -> Arc<dyn AsRef<crate::params::NetParameters>> {
if let Ok(nd) = self.netdir(crate::Timeliness::Unchecked) {
nd
} else {
Arc::new(crate::params::NetParameters::default())
}
}
}
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