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use syn::{Attribute, Ident, ReturnType, PatType, Receiver, FnArg, ImplItem}; use proc_macro::TokenStream; use syn::export::TokenStream2; use quote::ToTokens; #[allow(dead_code)] struct RpcMethod { attrs: Vec<Attribute>, ident: Ident, args: Vec<PatType>, receiver: Receiver, output: ReturnType, } impl RpcMethod { fn ident_web_api(&self) -> Ident { quote::format_ident!( "{}_web_api", self.ident ) } fn req_type(&self) -> TokenStream2 { let args = &self.args; let all_arg_types: Vec<_> = args.iter().map(|x| &x.ty).collect(); if all_arg_types.len() > 0 { quote::quote! { (#( #all_arg_types ),*,) } } else { quote::quote! { () } } } fn resp_type(&self) -> TokenStream2 { let output = &self.output; let output = match output { ReturnType::Default => syn::Type::Verbatim(quote::quote! {()}), ReturnType::Type(_, t) => (**t).clone(), }; quote::quote! { #output } } fn client_method(&self, client_field: &Ident) -> TokenStream2 { let ident = &self.ident; let ident_compressed = quote::format_ident!("{}_compressed", ident); let req_args: Vec<_> = self.args.iter().map(|x| &x.pat).collect(); let original_args = self.args.clone(); let resp_type = self.resp_type(); let web_api_string_name = self.ident_web_api().to_string(); if req_args.len() > 0 { quote::quote! { pub async fn #ident(&self, #( #original_args, )*) -> Result<#resp_type, ::persia_rpc::PersiaRpcError> { let req = (#( #req_args, )*); self.#client_field.call_async(#web_api_string_name, req, false).await } pub async fn #ident_compressed(&self, #( #original_args, )*) -> Result<#resp_type, ::persia_rpc::PersiaRpcError> { let req = (#( #req_args, )*); self.#client_field.call_async(#web_api_string_name, req, true).await } } } else { quote::quote! { pub async fn #ident(&self) -> Result<#resp_type, ::persia_rpc::PersiaRpcError> { self.#client_field.call_async(#web_api_string_name, (), false).await } pub async fn #ident_compressed(&self) -> Result<#resp_type, ::persia_rpc::PersiaRpcError> { self.#client_field.call_async(#web_api_string_name, (), true).await } } } } fn service_method(&self) -> TokenStream2 { let method_ident = &self.ident; let web_api_ident = self.ident_web_api(); let web_api_ident_compressed = quote::format_ident!("{}_compressed", web_api_ident); let req_args: Vec<_> = self.args.iter().map(|x| &x.pat).collect(); let req_args2 = req_args.clone(); let req_type = self.req_type(); let call_line = if req_args.len() > 0 { quote::quote! { let input: #req_type = ::tokio::task::block_in_place(|| ::bincode::deserialize(body.as_ref())) .context(::persia_rpc::SerializationFailure {})?; let (#( #req_args, )*) = input; let output = self.#method_ident(#( #req_args2, )* ).await; } } else { quote::quote! { let output = self.#method_ident().await; } }; quote::quote! { pub async fn #web_api_ident(&self, req: ::hyper::Request<::hyper::Body>) -> Result<::hyper::Response<hyper::Body>, ::hyper::Error> { let result = async move { let body = ::hyper::body::to_bytes(req.into_body()) .await .context(::persia_rpc::TransportError { msg: "hyper read body error".to_string(), })?; #call_line let output = ::tokio::task::block_in_place(|| ::bincode::serialize(&output)) .context(::persia_rpc::SerializationFailure {})?; Ok::<_, ::persia_rpc::PersiaRpcError>(output) } .await; match result { Ok(x) => Ok(::hyper::Response::new(::hyper::body::Body::from(x))), Err(e) => { ::tracing::error!("server side error {:?}", e); let mut resp = ::hyper::Response::default(); *resp.status_mut() = ::hyper::StatusCode::INTERNAL_SERVER_ERROR; *resp.body_mut() = ::hyper::body::Body::from(format!("{:#?}", e)); Ok(resp) } } } pub async fn #web_api_ident_compressed(&self, req: ::hyper::Request<::hyper::Body>) -> Result<::hyper::Response<hyper::Body>, ::hyper::Error> { let result = async move { let body = ::hyper::body::to_bytes(req.into_body()) .await .context(::persia_rpc::TransportError { msg: "hyper read body error".to_string(), })?; let body = ::tokio::task::block_in_place(|| ::lz4::block::decompress(&body, None)) .context(::persia_rpc::IOFailure {})?; #call_line let output = ::tokio::task::block_in_place(|| ::bincode::serialize(&output)) .context(::persia_rpc::SerializationFailure {})?; let output = ::tokio::task::block_in_place(|| ::lz4::block::compress(&output, None, true)) .context(::persia_rpc::IOFailure {})?; Ok::<_, ::persia_rpc::PersiaRpcError>(output) } .await; match result { Ok(x) => Ok(::hyper::Response::new(::hyper::body::Body::from(x))), Err(e) => { ::tracing::error!("server side error {:?}", e); let mut resp = ::hyper::Response::default(); *resp.status_mut() = ::hyper::StatusCode::INTERNAL_SERVER_ERROR; *resp.body_mut() = ::hyper::body::Body::from(format!("{:#?}", e)); Ok(resp) } } } } } } struct Service { rpcs: Vec<RpcMethod>, service_type_name: String, } impl Service { fn client_impl(&self) -> TokenStream2 { let client_type_name = quote::format_ident!("{}Client", self.service_type_name); let client_field = quote::format_ident!("inner_rpc_client"); let client_methods: Vec<_> = self.rpcs.iter().map(|x| x.client_method(&client_field)).collect(); quote::quote! { pub struct #client_type_name { #client_field: ::persia_rpc::RpcClient } impl #client_type_name { pub fn new(client: ::persia_rpc::RpcClient) -> Self { Self { #client_field: client } } #( #client_methods )* } } } fn service_impl(&self) -> TokenStream2 { let service_ident = quote::format_ident!("{}", self.service_type_name); let service_web_api_impl: Vec<_> = self.rpcs.iter().map(|x| x.service_method()).collect(); let match_arms: Vec<_> = self.rpcs.iter().map(|x| { let web_api_string_name = "/".to_string() + x.ident_web_api().to_string().as_str(); let ident_web_api = x.ident_web_api(); quote::quote! { #web_api_string_name => { Box::pin(async move { server.#ident_web_api(req).await }) } } }).collect(); quote::quote! { use std::task::{Context, Poll}; impl #service_ident { #( #service_web_api_impl )* } impl ::hyper::service::Service<::hyper::Request<::hyper::Body>> for #service_ident { type Response = ::hyper::Response<::hyper::Body>; type Error = ::hyper::Error; type Future = std::pin::Pin<Box<dyn std::future::Future<Output = Result<Self::Response, Self::Error>> + Send>>; fn poll_ready(&mut self, _ctx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> { Poll::Ready(Ok(())) } fn call(&mut self, req: ::hyper::Request<::hyper::Body>) -> Self::Future { let server = self.clone(); match req.uri().path() { #( #match_arms )* _ => { Box::pin( async move { let mut not_found = hyper::Response::default(); *not_found.status_mut() = hyper::StatusCode::NOT_FOUND; Ok(not_found) } ) } } } } } } } #[proc_macro_attribute] pub fn service(_attr: TokenStream, tokens: TokenStream) -> TokenStream { let item = syn::parse_macro_input!(tokens as syn::ItemImpl); let service_name = item.self_ty.clone().into_token_stream().to_string(); let rpc_methods: Vec<_> = item.items.iter() .filter_map(|item| match item { ImplItem::Method(m) => Some(m), _ => None, }) .map(|m| { let mut args = vec![]; let mut receiver = None; for arg in &m.sig.inputs { match arg { FnArg::Receiver(captures) => { if captures.mutability.is_some() { panic!("should be &self"); } else if receiver.is_some() { panic!("duplicated self"); } else { receiver = Some(captures.clone()); } } FnArg::Typed(captures) => match *captures.pat { syn::Pat::Ident(_) => args.push(captures.clone()), _ => panic!("patterns aren't allowd in RPC args"), }, } } RpcMethod { attrs: m.attrs.clone(), ident: m.sig.ident.clone(), args, receiver: receiver.unwrap(), output: m.sig.output.clone(), } }) .collect(); let s = Service { rpcs: rpc_methods, service_type_name: service_name, }; let client_impl = s.client_impl(); let service_impl = s.service_impl(); (quote::quote! { #item #service_impl #client_impl }).into() }