59 lines
1.6 KiB
Rust
59 lines
1.6 KiB
Rust
use serde::Serialize;
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use log::info;
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use tokio::sync::watch;
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/// A node's identifier, which is also its public cryptographic key
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pub type NodeID = sodiumoxide::crypto::sign::ed25519::PublicKey;
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/// Utility function: encodes any serializable value in MessagePack binary format
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/// using the RMP library.
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///
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/// Field names and variant names are included in the serialization.
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/// This is used internally by the netapp communication protocol.
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pub fn rmp_to_vec_all_named<T>(val: &T) -> Result<Vec<u8>, rmp_serde::encode::Error>
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where
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T: Serialize + ?Sized,
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{
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let mut wr = Vec::with_capacity(128);
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let mut se = rmp_serde::Serializer::new(&mut wr)
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.with_struct_map()
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.with_string_variants();
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val.serialize(&mut se)?;
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Ok(wr)
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}
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/// This async function returns only when a true signal was received
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/// from a watcher that tells us when to exit.
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///
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/// Usefull in a select statement to interrupt another
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/// future:
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/// ```ignore
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/// select!(
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/// _ = a_long_task() => Success,
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/// _ = await_exit(must_exit) => Interrupted,
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/// )
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/// ```
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pub async fn await_exit(mut must_exit: watch::Receiver<bool>) {
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while !*must_exit.borrow_and_update() {
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if must_exit.changed().await.is_err() {
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break;
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}
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}
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}
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/// Creates a watch that contains `false`, and that changes
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/// to `true` when a Ctrl+C signal is received.
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pub fn watch_ctrl_c() -> watch::Receiver<bool> {
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let (send_cancel, watch_cancel) = watch::channel(false);
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tokio::spawn(async move {
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tokio::signal::ctrl_c()
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.await
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.expect("failed to install CTRL+C signal handler");
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info!("Received CTRL+C, shutting down.");
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send_cancel.send(true).unwrap();
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});
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watch_cancel
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}
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