cometbft-proto 0.1.0-alpha.2

A Rust implementation of the CometBFT proto structs.
Documentation 
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//! Serialize/deserialize `Option<T>` type where `T` has a serializer/deserializer.
//! Deserialize to `None` if the received value equals the `Default` value.
//! Serialize `None` as `Some` with the `Default` value for `T`.

// TODO: Rename this serializer to something like "default_eq_none" to mirror its purpose better.

use serde::{Deserialize, Deserializer, Serialize, Serializer};

/// Deserialize `Option<T>`
pub fn deserialize<'de, D, T>(deserializer: D) -> Result<Option<T>, D::Error>
where
    D: Deserializer<'de>,
    T: Deserialize<'de> + Default + PartialEq,
{
    Ok(Option::<T>::deserialize(deserializer)?.filter(|t| t != &T::default()))
}

/// Serialize `Option<T>`
pub fn serialize<S, T>(value: &Option<T>, serializer: S) -> Result<S::Ok, S::Error>
where
    S: Serializer,
    T: Default + Serialize,
{
    match value {
        Some(v) => serializer.serialize_some(v),
        None => serializer.serialize_some(&T::default()),
    }
}