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use std::net::SocketAddr;
use std::net::ToSocketAddrs;
use std::pin::Pin;
use log::info;
use serde::Serialize;
use futures::Stream;
use tokio::sync::watch;
use crate::message::SerializeMessage;
/// A node's identifier, which is also its public cryptographic key
pub type NodeID = sodiumoxide::crypto::sign::ed25519::PublicKey;
/// A node's secret key
pub type NodeKey = sodiumoxide::crypto::sign::ed25519::SecretKey;
/// A network key
pub type NetworkKey = sodiumoxide::crypto::auth::Key;
/// A stream of associated data.
///
/// The Stream can continue after receiving an error.
/// When sent through Netapp, the Vec may be split in smaller chunk in such a way
/// consecutive Vec may get merged, but Vec and error code may not be reordered
///
/// Error code 255 means the stream was cut before its end. Other codes have no predefined
/// meaning, it's up to your application to define their semantic.
pub type ByteStream = Pin<Box<dyn Stream<Item = Packet> + Send>>;
pub type Packet = Result<Vec<u8>, u8>;
/// 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>, Option<ByteStream>), rmp_serde::encode::Error>
where
T: SerializeMessage + ?Sized,
{
let mut wr = Vec::with_capacity(128);
let mut se = rmp_serde::Serializer::new(&mut wr)
.with_struct_map()
.with_string_variants();
let (val, stream) = val.serialize_msg();
val.serialize(&mut se)?;
Ok((wr, stream))
}
/// 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:
/// ```ignore
/// 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;
}
}
}
/// Creates a watch that contains `false`, and that changes
/// to `true` when a Ctrl+C signal is received.
pub fn watch_ctrl_c() -> watch::Receiver<bool> {
let (send_cancel, watch_cancel) = watch::channel(false);
tokio::spawn(async move {
tokio::signal::ctrl_c()
.await
.expect("failed to install CTRL+C signal handler");
info!("Received CTRL+C, shutting down.");
send_cancel.send(true).unwrap();
});
watch_cancel
}
/// Parse a peer's address including public key, written in the format:
/// `<public key hex>@<ip>:<port>`
pub fn parse_peer_addr(peer: &str) -> Option<(NodeID, SocketAddr)> {
let delim = peer.find('@')?;
let (key, ip) = peer.split_at(delim);
let pubkey = NodeID::from_slice(&hex::decode(&key).ok()?)?;
let ip = ip[1..].parse::<SocketAddr>().ok()?;
Some((pubkey, ip))
}
/// Parse and resolve a peer's address including public key, written in the format:
/// `<public key hex>@<ip or hostname>:<port>`
pub fn parse_and_resolve_peer_addr(peer: &str) -> Option<(NodeID, Vec<SocketAddr>)> {
let delim = peer.find('@')?;
let (key, host) = peer.split_at(delim);
let pubkey = NodeID::from_slice(&hex::decode(&key).ok()?)?;
let hosts = host[1..].to_socket_addrs().ok()?.collect::<Vec<_>>();
if hosts.is_empty() {
return None;
}
Some((pubkey, hosts))
}
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