aboutsummaryrefslogtreecommitdiff
path: root/jsonrpc/jsonrpc_macro/src
diff options
context:
space:
mode:
Diffstat (limited to 'jsonrpc/jsonrpc_macro/src')
-rw-r--r--jsonrpc/jsonrpc_macro/src/lib.rs47
1 files changed, 47 insertions, 0 deletions
diff --git a/jsonrpc/jsonrpc_macro/src/lib.rs b/jsonrpc/jsonrpc_macro/src/lib.rs
new file mode 100644
index 0000000..f2015d4
--- /dev/null
+++ b/jsonrpc/jsonrpc_macro/src/lib.rs
@@ -0,0 +1,47 @@
+use proc_macro::TokenStream;
+use proc_macro2::{Ident, TokenStream as TokenStream2};
+use quote::quote;
+use syn::{parse_macro_input, spanned::Spanned, ImplItem, ItemImpl, Type};
+
+macro_rules! err {
+ ($($tt:tt)*) => {
+ return syn::Error::new($($tt)*).to_compile_error().into()
+ };
+}
+
+#[proc_macro_attribute]
+pub fn rpc_impl(_attr: TokenStream, item: TokenStream) -> TokenStream {
+ let mut methods: Vec<Ident> = vec![];
+
+ let item2 = item.clone();
+ let parsed_input = parse_macro_input!(item2 as ItemImpl);
+
+ let self_ty = match *parsed_input.self_ty {
+ Type::Path(p) => p,
+ _ => err!(
+ parsed_input.span(),
+ "implementing the trait `RPCService` on this type is unsupported"
+ ),
+ };
+
+ if parsed_input.items.is_empty() {
+ err!(self_ty.span(), "At least one method should be implemented");
+ }
+
+ for item in parsed_input.items {
+ match item {
+ ImplItem::Method(method) => {
+ methods.push(method.sig.ident);
+ }
+ _ => err!(item.span(), "unexpected item"),
+ }
+ }
+
+ let item2: TokenStream2 = item.into();
+ let quoted = quote! {
+ karyon_jsonrpc_internal::impl_rpc_service!(#self_ty, #(#methods),*);
+ #item2
+ };
+
+ quoted.into()
+}