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use std::{
borrow::Borrow,
fmt,
hash::{Hash, Hasher},
ops::Deref,
sync::Arc,
};
use libp2p::core::upgrade;
pub mod event;
#[derive(Debug, Clone)]
pub enum ProtocolName {
Static(&'static str),
OnHeap(Arc<str>),
}
impl From<&'static str> for ProtocolName {
fn from(name: &'static str) -> Self {
Self::Static(name)
}
}
impl From<Arc<str>> for ProtocolName {
fn from(name: Arc<str>) -> Self {
Self::OnHeap(name)
}
}
impl From<String> for ProtocolName {
fn from(name: String) -> Self {
Self::OnHeap(Arc::from(name))
}
}
impl Deref for ProtocolName {
type Target = str;
fn deref(&self) -> &str {
match self {
Self::Static(name) => name,
Self::OnHeap(name) => &name,
}
}
}
impl Borrow<str> for ProtocolName {
fn borrow(&self) -> &str {
self
}
}
impl PartialEq for ProtocolName {
fn eq(&self, other: &Self) -> bool {
(self as &str) == (other as &str)
}
}
impl Eq for ProtocolName {}
impl Hash for ProtocolName {
fn hash<H: Hasher>(&self, state: &mut H) {
(self as &str).hash(state)
}
}
impl fmt::Display for ProtocolName {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str(self)
}
}
impl upgrade::ProtocolName for ProtocolName {
fn protocol_name(&self) -> &[u8] {
(self as &str).as_bytes()
}
}
#[cfg(test)]
mod tests {
use super::ProtocolName;
use std::{
borrow::Borrow,
collections::hash_map::DefaultHasher,
hash::{Hash, Hasher},
};
#[test]
fn protocol_name_keys_are_equivalent_to_str_keys() {
const PROTOCOL: &'static str = "/some/protocol/1";
let static_protocol_name = ProtocolName::from(PROTOCOL);
let on_heap_protocol_name = ProtocolName::from(String::from(PROTOCOL));
assert_eq!(<ProtocolName as Borrow<str>>::borrow(&static_protocol_name), PROTOCOL);
assert_eq!(<ProtocolName as Borrow<str>>::borrow(&on_heap_protocol_name), PROTOCOL);
assert_eq!(static_protocol_name, on_heap_protocol_name);
assert_eq!(hash(static_protocol_name), hash(PROTOCOL));
assert_eq!(hash(on_heap_protocol_name), hash(PROTOCOL));
}
#[test]
fn different_protocol_names_do_not_compare_equal() {
const PROTOCOL1: &'static str = "/some/protocol/1";
let static_protocol_name1 = ProtocolName::from(PROTOCOL1);
let on_heap_protocol_name1 = ProtocolName::from(String::from(PROTOCOL1));
const PROTOCOL2: &'static str = "/some/protocol/2";
let static_protocol_name2 = ProtocolName::from(PROTOCOL2);
let on_heap_protocol_name2 = ProtocolName::from(String::from(PROTOCOL2));
assert_ne!(<ProtocolName as Borrow<str>>::borrow(&static_protocol_name1), PROTOCOL2);
assert_ne!(<ProtocolName as Borrow<str>>::borrow(&on_heap_protocol_name1), PROTOCOL2);
assert_ne!(static_protocol_name1, static_protocol_name2);
assert_ne!(static_protocol_name1, on_heap_protocol_name2);
assert_ne!(on_heap_protocol_name1, on_heap_protocol_name2);
}
fn hash<T: Hash>(x: T) -> u64 {
let mut hasher = DefaultHasher::new();
x.hash(&mut hasher);
hasher.finish()
}
}