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First pass at macro

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This commit is contained in:
Lucio Franco
2019-08-15 17:50:25 -04:00
parent 0a8aaa8071
commit 5e208d9da2
10 changed files with 470 additions and 155 deletions
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tonic-macros/src/lib.rs
+168 -130
View File
@@ -2,155 +2,193 @@
#![recursion_limit = "256"]
extern crate proc_macro;
mod service;
use proc_macro::TokenStream;
use prost_build::{Comments, Method, Service};
use quote::quote;
use syn::{ImplItem, ImplItemMethod, ItemImpl, Type};
use serde::Deserialize;
use syn::{AttributeArgs, ItemImpl};
#[proc_macro_attribute]
pub fn server(attr: TokenStream, item: TokenStream) -> TokenStream {
let service = load_service(attr);
let mut original = item.clone();
let ItemImpl { self_ty, items, .. } = syn::parse_macro_input!(item as ItemImpl);
let item = syn::parse_macro_input!(item as ItemImpl);
let args = syn::parse_macro_input!(attr as AttributeArgs);
let s = if let Type::Path(t) = *self_ty {
t.path.segments.iter().next().unwrap().clone()
} else {
panic!("wrong type!")
};
let service = load_service(args);
let service_def = service::parse_service_impl(item, service);
let output = service::generate(service_def);
let mut m_ident = None;
for item in items {
if let ImplItem::Method(method) = item {
// println!("{:?}", method);
original.extend(TokenStream::from(output));
original
let ImplItemMethod { sig, .. } = method;
// let mut original = item.clone();
// let ItemImpl { self_ty, items, .. } = syn::parse_macro_input!(item as ItemImpl);
if sig.asyncness.is_some() {
let name = format!("{}", sig.ident);
// let mut m_ident = None;
// for item in items {
// if let ImplItem::Method(method) = item {
// // println!("{:?}", method);
if let Some(_method) = service.methods.iter().find(|method| method.name == name) {
// println!("found method!");
m_ident = Some(sig.ident.clone());
}
}
}
}
// let ImplItemMethod { sig, .. } = method;
// if sig.asyncness.is_some() {
// let name = format!("{}", sig.ident);
// if let Some(_method) = service.methods.iter().find(|method| method.name == name) {
// // println!("found method!");
// m_ident = Some(sig.ident.clone());
// }
// }
// }
// }
// let service_name = service.proto_name.clone();
let ts = quote! {
use tonic::_codegen;
use proto::*;
// let ts = quote! {
// use tonic::_codegen;
// use proto::*;
#[derive(Clone)]
pub struct GrpcServer {
inner: std::sync::Arc<#s>,
}
// #[derive(Clone)]
// pub struct GrpcServer {
// inner: std::sync::Arc<#s>,
// }
impl GrpcServer {
fn new(t: #s) -> Self {
Self { inner: std::sync::Arc::new(t) }
// impl GrpcServer {
// fn new(t: #s) -> Self {
// Self { inner: std::sync::Arc::new(t) }
// }
// }
// impl _codegen::Service<()> for GrpcServer {
// type Response = Self;
// type Error = tonic::error::Never;
// type Future = _codegen::Ready<Result<Self::Response, Self::Error>>;
// fn poll_ready(&mut self, _cx: &mut _codegen::Context<'_>) -> _codegen::Poll<Result<(), Self::Error>> {
// std::task::Poll::Ready(Ok(()))
// }
// fn call(&mut self, _: ()) -> Self::Future {
// _codegen::ok(self.clone())
// }
// }
// impl _codegen::Service<_codegen::http::Request<tower_h2::RecvBody>> for GrpcServer {
// type Response = _codegen::http::Response<tonic::body::BoxAsyncBody>;
// type Error = tonic::error::Never;
// type Future = _codegen::ResponseFuture2<Self::Response, Self::Error>;
// fn poll_ready(&mut self, _cx: &mut _codegen::Context<'_>) -> _codegen::Poll<Result<(), Self::Error>> {
// Ok(()).into()
// }
// fn call(&mut self, request: _codegen::http::Request<tower_h2::RecvBody>) -> Self::Future {
// let inner = self.inner.clone();
// match request.uri().path() {
// "/helloworld.Greeter/SayHello" => {
// use tonic::_codegen::*;
// use tonic::*;
// pub struct SayHello(pub std::sync::Arc<#s>);
// impl tonic::server::UnaryService<HelloRequest> for SayHello {
// type Response = HelloReply;
// type Future = Pin<Box<dyn Future<Output = Result<Response<Self::Response>, Status>> + Send + 'static>>;
// fn call(&mut self, request: Request<HelloRequest>) -> Self::Future {
// let inner = self.0.clone();
// let fut = async move {
// inner.#m_ident(request).await
// };
// Box::pin(fut)
// }
// }
// let inner = self.inner.clone();
// let fut = async move {
// let method = SayHello(inner);
// let codec = tonic::codec::ProstCodec::new();
// let mut grpc = tonic::server::Grpc::new(codec);
// let res = grpc.unary(method, request).await;
// Ok(res)
// };
// Box::pin(fut)
// },
// _ => unimplemented!("use grpc unimplemented")
// }
// }
// }
// };
}
fn load_service(attr: AttributeArgs) -> Service {
use syn::{Lit, Meta, MetaNameValue, NestedMeta};
let service = attr
.iter()
.filter_map(|i| match i {
NestedMeta::Meta(Meta::NameValue(MetaNameValue { path, lit, .. }))
if path.segments.first().unwrap().ident == "service" =>
{
Some(lit.clone())
}
}
impl _codegen::Service<()> for GrpcServer {
type Response = Self;
type Error = tonic::error::Never;
type Future = _codegen::Ready<Result<Self::Response, Self::Error>>;
fn poll_ready(&mut self, _cx: &mut _codegen::Context<'_>) -> _codegen::Poll<Result<(), Self::Error>> {
std::task::Poll::Ready(Ok(()))
}
fn call(&mut self, _: ()) -> Self::Future {
_codegen::ok(self.clone())
}
}
impl _codegen::Service<_codegen::http::Request<tower_h2::RecvBody>> for GrpcServer {
type Response = _codegen::http::Response<tonic::body::BoxAsyncBody>;
type Error = tonic::error::Never;
type Future = _codegen::ResponseFuture2<Self::Response, Self::Error>;
fn poll_ready(&mut self, _cx: &mut _codegen::Context<'_>) -> _codegen::Poll<Result<(), Self::Error>> {
Ok(()).into()
}
fn call(&mut self, request: _codegen::http::Request<tower_h2::RecvBody>) -> Self::Future {
let inner = self.inner.clone();
match request.uri().path() {
"/helloworld.Greeter/SayHello" => {
use tonic::_codegen::*;
use tonic::*;
pub struct SayHello(pub std::sync::Arc<#s>);
impl tonic::server::UnaryService<HelloRequest> for SayHello {
type Response = HelloReply;
type Future = Pin<Box<dyn Future<Output = Result<Response<Self::Response>, Status>> + Send + 'static>>;
fn call(&mut self, request: Request<HelloRequest>) -> Self::Future {
let inner = self.0.clone();
let fut = async move {
inner.#m_ident(request).await
};
Box::pin(fut)
}
}
let inner = self.inner.clone();
let fut = async move {
let method = SayHello(inner);
let codec = tonic::codec::ProstCodec::new();
let mut grpc = tonic::server::Grpc::new(codec);
let res = grpc.unary(method, request).await;
Ok(res)
};
Box::pin(fut)
},
_ => unimplemented!("use grpc unimplemented")
}
}
}
_ => None,
})
.next();
let service_name = match service {
Some(Lit::Str(s)) => s.value(),
Some(_) => panic!("expected a literal string"),
None => panic!("expected a `service = \"package.Service\" attribute"),
};
original.extend(TokenStream::from(ts));
original
let file = format!(
"{}/{}.json",
std::env::var("OUT_DIR").unwrap(),
service_name
);
let json = std::fs::read_to_string(file).unwrap();
serde_json::from_str(&json).unwrap()
}
fn load_service(_attr: TokenStream) -> Service {
Service {
name: "Greeter".into(),
proto_name: "greeter".into(),
package: "helloworld".into(),
comments: Comments {
leading_detached: Vec::new(),
leading: Vec::new(),
trailing: Vec::new(),
},
methods: vec![Method {
name: "say_hello".into(),
proto_name: "SayHello".into(),
comments: Comments {
leading_detached: Vec::new(),
leading: Vec::new(),
trailing: Vec::new(),
},
input_type: "HelloRequest".into(),
output_type: "HelloResponse".into(),
input_proto_type: "HelloRequest".into(),
output_proto_type: "HelloResponse".into(),
options: Default::default(),
client_streaming: false,
server_streaming: false,
}],
options: Default::default(),
}
/// A service descriptor.
#[derive(Debug, Deserialize)]
pub(crate) struct Service {
/// The service name in Rust style.
pub name: String,
/// The service name as it appears in the .proto file.
pub proto_name: String,
/// The package name as it appears in the .proto file.
pub package: String,
/// The service methods.
pub methods: Vec<Method>,
}
/// A service method descriptor.
#[derive(Debug, Deserialize)]
pub(crate) struct Method {
/// The name of the method in Rust style.
pub name: String,
/// The name of the method as it appears in the .proto file.
pub proto_name: String,
/// The input Rust type.
pub input_type: String,
/// The output Rust type.
pub output_type: String,
/// The input Protobuf type.
pub input_proto_type: String,
/// The output Protobuf type.
pub output_proto_type: String,
// /// The method options.
// pub options: prost_types::MethodOptions,
/// Identifies if client streams multiple client messages.
pub client_streaming: bool,
/// Identifies if server streams multiple server messages.
pub server_streaming: bool,
}