kanau-macro 0.1.0

Proc macros for kanau.
Documentation 
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use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, DeriveInput};

pub fn derive_proto_des(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);
    let name = &input.ident;

    quote! {
        impl kanau::message::MessageDe for #name {
            type DeError = prost::DecodeError;

            fn from_bytes(bytes: &[u8]) -> Result<Self, Self::DeError> {
                use prost::Message;
                Self::decode(bytes)
            }
        }
    }.into()
}

pub fn derive_proto_ser(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);
    let name = &input.ident;

    quote! {
        impl kanau::message::MessageSer for #name {
            type SerError = prost::EncodeError;

            fn to_bytes(self) -> Result<Box<[u8]>, Self::SerError> {
                use prost::Message;
                let mut buf = Vec::new();
                self.encode(&mut buf)?;
                Ok(buf.into_boxed_slice())
            }
        }
    }.into()
}