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use bincode::{Decode, Encode};
use rand::{rngs::OsRng, RngCore};
use sha2::{Digest, Sha256};
use karyons_core::key_pair::PublicKey;
use crate::Error;
/// Represents a unique identifier for a peer.
#[derive(Clone, Debug, Eq, PartialEq, Hash, Decode, Encode)]
pub struct PeerID(pub [u8; 32]);
impl std::fmt::Display for PeerID {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
let id = self.0[0..8]
.iter()
.map(|b| format!("{:x}", b))
.collect::<Vec<String>>()
.join("");
write!(f, "{}", id)
}
}
impl PeerID {
/// Creates a new PeerID.
pub fn new(src: &[u8]) -> Self {
let mut hasher = Sha256::new();
hasher.update(src);
Self(hasher.finalize().into())
}
/// Generates a random PeerID.
pub fn random() -> Self {
let mut id: [u8; 32] = [0; 32];
OsRng.fill_bytes(&mut id);
Self(id)
}
}
impl From<[u8; 32]> for PeerID {
fn from(b: [u8; 32]) -> Self {
PeerID(b)
}
}
impl TryFrom<PublicKey> for PeerID {
type Error = Error;
fn try_from(pk: PublicKey) -> Result<Self, Self::Error> {
let pk: [u8; 32] = pk
.as_bytes()
.try_into()
.map_err(|_| Error::TryFromPublicKey("Failed to convert public key to [u8;32]"))?;
Ok(PeerID(pk))
}
}
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