AppFlowy/frontend/rust-lib/lib-dispatch/src/byte_trait.rs

use crate::errors::{DispatchError, InternalError};
use bytes::Bytes;

// To bytes
pub trait ToBytes {
    fn into_bytes(self) -> Result<Bytes, DispatchError>;
}

#[cfg(feature = "use_protobuf")]
impl<T> ToBytes for T
where
    T: std::convert::TryInto<Bytes, Error = protobuf::ProtobufError>,
{
    fn into_bytes(self) -> Result<Bytes, DispatchError> {
        match self.try_into() {
            Ok(data) => Ok(data),
            Err(e) => Err(InternalError::ProtobufError(format!(
                "Serial {:?} to bytes failed:{:?}",
                std::any::type_name::<T>(),
                e
            ))
            .into()),
        }
    }
}

#[cfg(feature = "use_serde")]
impl<T> ToBytes for T
where
    T: serde::Serialize,
{
    fn into_bytes(self) -> Result<Bytes, DispatchError> {
        match serde_json::to_string(&self.0) {
            Ok(s) => Ok(Bytes::from(s)),
            Err(e) => Err(InternalError::SerializeToBytes(format!("{:?}", e)).into()),
        }
    }
}

// From bytes

pub trait FromBytes: Sized {
    fn parse_from_bytes(bytes: Bytes) -> Result<Self, DispatchError>;
}

#[cfg(feature = "use_protobuf")]
impl<T> FromBytes for T
where
    // // https://stackoverflow.com/questions/62871045/tryfromu8-trait-bound-in-trait
    // T: for<'a> std::convert::TryFrom<&'a Bytes, Error =
    // protobuf::ProtobufError>,
    T: std::convert::TryFrom<Bytes, Error = protobuf::ProtobufError>,
{
    fn parse_from_bytes(bytes: Bytes) -> Result<Self, DispatchError> {
        match T::try_from(bytes) {
            Ok(data) => Ok(data),
            Err(e) => {
                tracing::error!(
                    "Parse payload to {} failed with error: {:?}",
                    std::any::type_name::<T>(),
                    e
                );
                Err(e.into())
            }
        }
    }
}

#[cfg(feature = "use_serde")]
impl<T> FromBytes for T
where
    T: serde::de::DeserializeOwned + 'static,
{
    fn parse_from_bytes(bytes: Bytes) -> Result<Self, String> {
        let s = String::from_utf8_lossy(&bytes);

        match serde_json::from_str::<T>(s.as_ref()) {
            Ok(data) => Ok(data),
            Err(e) => Err(format!("{:?}", e)),
        }
    }
}