netapp/src/util.rs

40 lines
1.1 KiB
Rust

use serde::Serialize;
use tokio::sync::watch;
pub type NodeID = sodiumoxide::crypto::sign::ed25519::PublicKey;
/// Utility function: encodes any serializable value in MessagePack binary format
/// using the RMP library.
///
/// Field names and variant names are included in the serialization.
/// This is used internally by the netapp communication protocol.
pub fn rmp_to_vec_all_named<T>(val: &T) -> Result<Vec<u8>, rmp_serde::encode::Error>
where
T: Serialize + ?Sized,
{
let mut wr = Vec::with_capacity(128);
let mut se = rmp_serde::Serializer::new(&mut wr)
.with_struct_map()
.with_string_variants();
val.serialize(&mut se)?;
Ok(wr)
}
/// This async function returns only when a true signal was received
/// from a watcher that tells us when to exit.
/// Usefull in a select statement to interrupt another
/// future:
/// ```
/// select!(
/// _ = a_long_task() => Success,
/// _ = await_exit(must_exit) => Interrupted,
/// )
/// ```
pub async fn await_exit(mut must_exit: watch::Receiver<bool>) {
while !*must_exit.borrow_and_update() {
if must_exit.changed().await.is_err() {
break;
}
}
}