pub type RpcResult<T> = Result<T, RpcError>;
#[derive(Debug, thiserror::Error)]
pub enum RpcError {
    #[error("transport: {0}")]
    Transport(#[from] std::io::Error),
    #[error("encoding: {0}")]
    Encoding(#[from] serde_json::Error),
    #[error("frame of {actual} byte(s) exceeds the {limit} byte limit")]
    FrameTooLarge { actual: usize, limit: usize },
    #[error("peer closed the connection")]
    Closed,
    #[error("service rejected the call: {0}")]
    Rejected(String),
    #[error("service is unavailable: {0}")]
    Unavailable(String),
}