1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
#![recursion_limit = "128"]
extern crate proc_macro;
use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, DeriveInput};
#[proc_macro_derive(RpcxParam)]
pub fn rpcx_param(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as DeriveInput);
let name = input.ident;
let expanded = quote! {
impl RpcxParam for #name {
fn into_bytes(&self, st: SerializeType) -> Result<Vec<u8>> {
match st {
SerializeType::JSON => serde_json::to_vec(self).map_err(|err| Error::from(err)),
SerializeType::MsgPack => {
rmps::to_vec(self).map_err(|err| Error::new(ErrorKind::Other, err.description()))
}
_ => Err(Error::new(ErrorKind::Other, "unknown format")),
}
}
fn from_slice(&mut self, st: SerializeType, data: &[u8]) -> Result<()> {
match st {
SerializeType::JSON => {
let param: Self = serde_json::from_slice(data)?;
*self = param;
Ok(())
}
SerializeType::MsgPack => {
let param: Self = rmps::from_slice(data)
.map_err(|err| Error::new(ErrorKind::Other, err.description()))?;
*self = param;
Ok(())
}
_ => Err(Error::new(ErrorKind::Other, "unknown format")),
}
}
}
};
TokenStream::from(expanded)
}