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use std::{fmt, ops::Deref};
use derive_more::From;
use serde::{
de::{self, Deserializer},
ser::Serializer,
Deserialize, Serialize,
};
/// Messages must be instances of `Serialize` and `Deserialize` because of
/// network communication and message dumping. However, in some cases, it's
/// desired to have messages that cannot be serialized. For instance, when
/// sharding TCP sockets.
///
/// `Local<T>` implements `Serialize` and `Deserialize` for any `T`. Meanwhile,
/// it can be serialized (but w/o useful information), it cannot be deserialized
/// (it returns an error on attempts).
#[derive(Clone, Copy, PartialEq, Eq, Default, From)]
pub struct Local<T>(T);
impl<T> Local<T> {
#[inline]
pub fn into_inner(self) -> T {
self.0
}
}
impl<T> Deref for Local<T> {
type Target = T;
#[inline]
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<T> fmt::Debug for Local<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "<local>")
}
}
impl<T> Serialize for Local<T> {
#[inline]
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
// TODO: fail to serialize in the network context.
// TODO: practically `T` is `Debug`, use it?
serializer.serialize_unit_struct("Local")
}
}
impl<'de, T> Deserialize<'de> for Local<T> {
fn deserialize<D>(_deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
Err(de::Error::custom("Local<T> cannot be deserialized"))
}
}