889 lines
30 KiB
Rust
889 lines
30 KiB
Rust
// Copyright 2015, 2016 Ethcore (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use aster;
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use syntax::ast::{
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MetaItem,
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Item,
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ImplItemKind,
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MethodSig,
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Arg,
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PatKind,
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FunctionRetTy,
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Ty,
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TraitRef,
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Ident,
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Generics,
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TraitItemKind,
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};
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use syntax::ast;
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use syntax::codemap::Span;
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use syntax::ext::base::{Annotatable, ExtCtxt};
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use syntax::ptr::P;
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pub struct Error;
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const RESERVED_MESSAGE_IDS: u16 = 16;
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pub fn expand_ipc_implementation(
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cx: &mut ExtCtxt,
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span: Span,
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meta_item: &MetaItem,
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annotatable: &Annotatable,
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push: &mut FnMut(Annotatable)
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) {
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let item = match *annotatable {
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Annotatable::Item(ref item) => item,
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_ => {
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cx.span_err(meta_item.span, "`#[derive(Ipc)]` may only be applied to struct implementations");
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return;
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},
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};
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let builder = aster::AstBuilder::new().span(span);
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let interface_map = match implement_interface(cx, &builder, &item, push) {
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Ok(interface_map) => interface_map,
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Err(Error) => { return; },
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};
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push_client(cx, &builder, &interface_map, push);
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push(Annotatable::Item(interface_map.item));
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}
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fn field_name(builder: &aster::AstBuilder, arg: &Arg) -> ast::Ident {
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match arg.pat.node {
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PatKind::Ident(_, ref ident, _) => builder.id(ident.node),
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_ => { panic!("unexpected param in interface: {:?}", arg.pat.node) }
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}
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}
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pub fn replace_slice_u8(builder: &aster::AstBuilder, ty: &P<ast::Ty>) -> P<ast::Ty> {
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if ::syntax::print::pprust::ty_to_string(&strip_ptr(ty)) == "[u8]" {
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return builder.ty().id("Vec<u8>")
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}
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ty.clone()
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}
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struct NamedSignature<'a> {
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sig: &'a MethodSig,
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ident: &'a Ident,
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}
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fn push_invoke_signature_aster(
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builder: &aster::AstBuilder,
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named_signature: &NamedSignature,
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push: &mut FnMut(Annotatable),
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) -> Dispatch {
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let inputs = &named_signature.sig.decl.inputs;
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let (input_type_name, input_arg_names, input_arg_tys) = if inputs.len() > 0 {
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let first_field_name = field_name(builder, &inputs[0]).name.as_str();
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if first_field_name == "self" && inputs.len() == 1 { (None, vec![], vec![]) }
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else {
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let skip = if first_field_name == "self" { 2 } else { 1 };
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let name_str = format!("{}_input", named_signature.ident.name.as_str());
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let mut arg_names = Vec::new();
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let mut arg_tys = Vec::new();
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let arg_name = format!("{}", field_name(builder, &inputs[skip-1]).name);
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let arg_ty = &inputs[skip-1].ty;
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let mut tree = builder.item()
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.attr().word("derive(Binary)")
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.attr().word("allow(non_camel_case_types)")
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.struct_(name_str.as_str())
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.field(arg_name.as_str())
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.ty().build(replace_slice_u8(builder, &strip_ptr(arg_ty)));
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arg_names.push(arg_name);
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arg_tys.push(arg_ty.clone());
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for arg in inputs.iter().skip(skip) {
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let arg_name = format!("{}", field_name(builder, &arg));
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let arg_ty = &arg.ty;
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tree = tree.field(arg_name.as_str()).ty().build(replace_slice_u8(builder, &strip_ptr(arg_ty)));
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arg_names.push(arg_name);
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arg_tys.push(arg_ty.clone());
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}
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push(Annotatable::Item(tree.build()));
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(Some(name_str.to_owned()), arg_names, arg_tys)
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}
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}
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else {
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(None, vec![], vec![])
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};
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let return_type_ty = match named_signature.sig.decl.output {
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FunctionRetTy::Ty(ref ty) => {
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let name_str = format!("{}_output", named_signature.ident.name.as_str());
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let tree = builder.item()
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.attr().word("derive(Binary)")
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.attr().word("allow(non_camel_case_types)")
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.struct_(name_str.as_str())
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.field(format!("payload")).ty().build(ty.clone());
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push(Annotatable::Item(tree.build()));
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Some(ty.clone())
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}
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_ => None
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};
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Dispatch {
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function_name: format!("{}", named_signature.ident.name.as_str()),
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input_type_name: input_type_name,
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input_arg_names: input_arg_names,
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input_arg_tys: input_arg_tys,
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return_type_ty: return_type_ty,
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}
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}
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struct Dispatch {
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function_name: String,
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input_type_name: Option<String>,
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input_arg_names: Vec<String>,
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input_arg_tys: Vec<P<Ty>>,
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return_type_ty: Option<P<Ty>>,
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}
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// This is the expanded version of this:
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//
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// let invoke_serialize_stmt = quote_stmt!(cx, {
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// ::bincode::serde::serialize(& $output_type_id { payload: self. $function_name ($hand_param_a, $hand_param_b) }, ::bincode::SizeLimit::Infinite).unwrap()
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// });
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//
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// But the above does not allow comma-separated expressions for arbitrary number
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// of parameters ...$hand_param_a, $hand_param_b, ... $hand_param_n
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fn implement_dispatch_arm_invoke_stmt(
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cx: &ExtCtxt,
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builder: &aster::AstBuilder,
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dispatch: &Dispatch,
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) -> ast::Stmt
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{
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let function_name = builder.id(dispatch.function_name.as_str());
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let input_args_exprs = dispatch.input_arg_names.iter().enumerate().map(|(arg_index, arg_name)| {
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let arg_ident = builder.id(arg_name);
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let expr = quote_expr!(cx, input. $arg_ident);
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if has_ptr(&dispatch.input_arg_tys[arg_index]) { quote_expr!(cx, & $expr) }
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else { expr }
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}).collect::<Vec<P<ast::Expr>>>();
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let ext_cx = &*cx;
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::quasi::parse_stmt_panic(&mut ::syntax::parse::new_parser_from_tts(
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ext_cx.parse_sess(),
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ext_cx.cfg(),
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{
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let _sp = ext_cx.call_site();
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let mut tt = ::std::vec::Vec::new();
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::OpenDelim(::syntax::parse::token::Brace)));
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if dispatch.return_type_ty.is_some() {
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::ModSep));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Ident(ext_cx.ident_of("ipc"))));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::ModSep));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Ident(ext_cx.ident_of("binary"))));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::ModSep));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Ident(ext_cx.ident_of("serialize"))));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::OpenDelim(::syntax::parse::token::Paren)));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::BinOp(::syntax::parse::token::And)));
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}
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Ident(ext_cx.ident_of("self"))));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Dot));
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tt.extend(::quasi::ToTokens::to_tokens(&function_name, ext_cx).into_iter());
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::OpenDelim(::syntax::parse::token::Paren)));
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for arg_expr in input_args_exprs {
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tt.extend(::quasi::ToTokens::to_tokens(&arg_expr, ext_cx).into_iter());
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Comma));
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}
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::CloseDelim(::syntax::parse::token::Paren)));
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if dispatch.return_type_ty.is_some() {
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::CloseDelim(::syntax::parse::token::Paren)));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Dot));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Ident(ext_cx.ident_of("unwrap"))));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::OpenDelim(::syntax::parse::token::Paren)));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::CloseDelim(::syntax::parse::token::Paren)));
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}
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else {
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Semi));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Ident(ext_cx.ident_of("Vec"))));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::ModSep));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Ident(ext_cx.ident_of("new"))));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::OpenDelim(::syntax::parse::token::Paren)));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::CloseDelim(::syntax::parse::token::Paren)));
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}
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::CloseDelim(::syntax::parse::token::Brace)));
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tt
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})).unwrap()
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}
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fn implement_dispatch_arm_invoke(
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cx: &ExtCtxt,
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builder: &aster::AstBuilder,
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dispatch: &Dispatch,
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buffer: bool,
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) -> P<ast::Expr>
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{
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let deserialize_expr = if buffer {
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quote_expr!(cx, ::ipc::binary::deserialize(buf).expect("ipc deserialization error, aborting"))
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} else {
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quote_expr!(cx, ::ipc::binary::deserialize_from(r).expect("ipc deserialization error, aborting"))
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};
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let invoke_serialize_stmt = implement_dispatch_arm_invoke_stmt(cx, builder, dispatch);
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dispatch.input_type_name.as_ref().map(|val| {
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let input_type_id = builder.id(val.clone().as_str());
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quote_expr!(cx, {
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let input: $input_type_id = $deserialize_expr;
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$invoke_serialize_stmt
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})
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}).unwrap_or(quote_expr!(cx, { $invoke_serialize_stmt }))
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}
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/// generates dispatch match for method id
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fn implement_dispatch_arm(
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cx: &ExtCtxt,
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builder: &aster::AstBuilder,
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index: u32,
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dispatch: &Dispatch,
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buffer: bool,
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) -> ast::Arm
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{
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let index_ident = builder.id(format!("{}", index + (RESERVED_MESSAGE_IDS as u32)).as_str());
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let invoke_expr = implement_dispatch_arm_invoke(cx, builder, dispatch, buffer);
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let dispatching_trace = "Dispatching: ".to_owned() + &dispatch.function_name;
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let dispatching_trace_literal = builder.expr().lit().str::<&str>(&dispatching_trace);
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quote_arm!(cx, $index_ident => {
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trace!(target: "ipc", $dispatching_trace_literal);
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$invoke_expr
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})
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}
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fn implement_dispatch_arms(
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cx: &ExtCtxt,
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builder: &aster::AstBuilder,
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dispatches: &[Dispatch],
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buffer: bool,
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) -> Vec<ast::Arm>
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{
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let mut index = -1;
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dispatches.iter()
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.map(|dispatch| { index = index + 1; implement_dispatch_arm(cx, builder, index as u32, dispatch, buffer) }).collect()
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}
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pub fn strip_ptr(ty: &P<ast::Ty>) -> P<ast::Ty> {
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if let ast::TyKind::Rptr(_, ref ptr_mut) = ty.node {
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ptr_mut.ty.clone()
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}
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else { ty.clone() }
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}
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pub fn has_ptr(ty: &P<ast::Ty>) -> bool {
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if let ast::TyKind::Rptr(_, ref _ptr_mut) = ty.node {
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true
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}
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else { false }
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}
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/// returns an expression with the body for single operation that is being sent to server
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/// operation itself serializes input, writes to socket and waits for socket to respond
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/// (the latter only if original method signature returns anyting)
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///
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/// assuming expanded class contains method
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/// fn commit(&self, f: u32) -> u32
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///
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/// the expanded implementation will generate method for the client like that
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/// #[derive(Serialize)]
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/// struct Request<'a> {
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/// f: &'a u32,
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/// }
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/// let payload = Request{f: &f,};
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/// let mut socket_ref = self.socket.borrow_mut();
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/// let mut socket = socket_ref.deref_mut();
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/// let serialized_payload = ::bincode::serde::serialize(&payload, ::bincode::SizeLimit::Infinite).unwrap();
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/// ::ipc::invoke(0, &Some(serialized_payload), &mut socket);
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/// while !socket.ready().load(::std::sync::atomic::Ordering::Relaxed) { }
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/// ::bincode::serde::deserialize_from::<_, u32>(&mut socket, ::bincode::SizeLimit::Infinite).unwrap()
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fn implement_client_method_body(
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cx: &ExtCtxt,
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builder: &aster::AstBuilder,
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index: u16,
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interface_map: &InterfaceMap,
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) -> P<ast::Expr>
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{
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let dispatch = &interface_map.dispatches[index as usize];
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let index_ident = builder.id(format!("{}", index + RESERVED_MESSAGE_IDS).as_str());
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let request = if dispatch.input_arg_names.len() > 0 {
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let arg_name = dispatch.input_arg_names[0].as_str();
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let static_ty = strip_ptr(&dispatch.input_arg_tys[0]);
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let arg_ty = builder
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.ty().ref_()
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.lifetime("'a")
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.ty()
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.build(static_ty.clone());
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let mut tree = builder.item()
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.attr().word("derive(Binary)")
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.struct_("Request")
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.generics()
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.lifetime_name("'a")
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.build()
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.field(arg_name).ty()
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.build(arg_ty);
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for arg_idx in 1..dispatch.input_arg_names.len() {
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let arg_name = dispatch.input_arg_names[arg_idx].as_str();
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let static_ty = strip_ptr(&dispatch.input_arg_tys[arg_idx]);
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let arg_ty = builder
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.ty().ref_()
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.lifetime("'a")
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.ty()
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.build(static_ty);
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tree = tree.field(arg_name).ty().build(arg_ty);
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}
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let mut request_serialization_statements = Vec::new();
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let struct_tree = tree.build();
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let struct_stmt = quote_stmt!(cx, $struct_tree);
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request_serialization_statements.push(struct_stmt);
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// actually this is just expanded version of this:
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// request_serialization_statements.push(quote_stmt!(cx, let payload = Request { p1: &p1, p2: &p2, ... pn: &pn, }));
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// again, cannot dynamically create expression with arbitrary number of comma-separated members
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request_serialization_statements.push({
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let ext_cx = &*cx;
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::quasi::parse_stmt_panic(&mut ::syntax::parse::new_parser_from_tts(
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ext_cx.parse_sess(),
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ext_cx.cfg(),
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{
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let _sp = ext_cx.call_site();
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let mut tt = ::std::vec::Vec::new();
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Ident(ext_cx.ident_of("let"))));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Ident(ext_cx.ident_of("payload"))));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Eq));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Ident(ext_cx.ident_of("Request"))));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::OpenDelim(::syntax::parse::token::Brace)));
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for arg in dispatch.input_arg_names.iter() {
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Ident(ext_cx.ident_of(arg.as_str()))));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Colon));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::BinOp(::syntax::parse::token::And)));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Ident(ext_cx.ident_of(arg.as_str()))));
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Comma));
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}
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tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::CloseDelim(::syntax::parse::token::Brace)));
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tt
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}))
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});
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request_serialization_statements.push(
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quote_stmt!(cx, let mut socket = self.socket.write().unwrap(); ));
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request_serialization_statements.push(
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quote_stmt!(cx, let serialized_payload = ::ipc::binary::serialize(&payload).unwrap()));
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request_serialization_statements.push(
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quote_stmt!(cx, ::ipc::invoke($index_ident, &Some(serialized_payload), &mut *socket)));
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request_serialization_statements
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}
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else {
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let mut request_serialization_statements = Vec::new();
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request_serialization_statements.push(
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quote_stmt!(cx, let mut socket = self.socket.write().unwrap(); ));
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request_serialization_statements.push(
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quote_stmt!(cx, ::ipc::invoke($index_ident, &None, &mut *socket)));
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request_serialization_statements
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};
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let invocation_trace = "Invoking: ".to_owned() + &dispatch.function_name;
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let invocation_trace_literal = builder.expr().lit().str::<&str>(&invocation_trace);
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if let Some(ref return_ty) = dispatch.return_type_ty {
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let return_expr = quote_expr!(cx,
|
|
::ipc::binary::deserialize_from::<$return_ty, _>(&mut *socket).unwrap()
|
|
);
|
|
quote_expr!(cx, {
|
|
trace!(target: "ipc", $invocation_trace_literal);
|
|
$request
|
|
$return_expr
|
|
})
|
|
}
|
|
else {
|
|
quote_expr!(cx, {
|
|
trace!(target: "ipc", $invocation_trace_literal);
|
|
$request
|
|
})
|
|
}
|
|
}
|
|
|
|
/// Generates signature and body (see `implement_client_method_body`)
|
|
/// for the client (signature is identical to the original method)
|
|
fn implement_client_method(
|
|
cx: &ExtCtxt,
|
|
builder: &aster::AstBuilder,
|
|
index: u16,
|
|
interface_map: &InterfaceMap,
|
|
)
|
|
-> ast::ImplItem
|
|
{
|
|
let dispatch = &interface_map.dispatches[index as usize];
|
|
let method_name = builder.id(dispatch.function_name.as_str());
|
|
let body = implement_client_method_body(cx, builder, index, interface_map);
|
|
|
|
let ext_cx = &*cx;
|
|
// expanded version of this
|
|
// pub fn $method_name(&self, p1: p1_ty, p2: p2_ty ... pn: pn_ty, ) [-> return_ty] { $body }
|
|
// looks like it's tricky to build function declaration with aster if body already generated
|
|
let signature = ::syntax::parse::parser::Parser::parse_impl_item(
|
|
&mut ::syntax::parse::new_parser_from_tts(
|
|
ext_cx.parse_sess(),
|
|
ext_cx.cfg(),
|
|
{
|
|
let _sp = ext_cx.call_site();
|
|
let mut tt = ::std::vec::Vec::new();
|
|
tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Ident(ext_cx.ident_of("fn"))));
|
|
tt.extend(::quasi::ToTokens::to_tokens(&method_name, ext_cx).into_iter());
|
|
tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::OpenDelim(::syntax::parse::token::Paren)));
|
|
tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::BinOp(::syntax::parse::token::And)));
|
|
tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Ident(ext_cx.ident_of("self"))));
|
|
tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Comma));
|
|
|
|
for arg_idx in 0..dispatch.input_arg_names.len() {
|
|
let arg_name = dispatch.input_arg_names[arg_idx].as_str();
|
|
let arg_ty = dispatch.input_arg_tys[arg_idx].clone();
|
|
|
|
tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Ident(ext_cx.ident_of(arg_name))));
|
|
tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Colon));
|
|
tt.extend(::quasi::ToTokens::to_tokens(&arg_ty, ext_cx).into_iter());
|
|
tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::Comma));
|
|
}
|
|
tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::CloseDelim(::syntax::parse::token::Paren)));
|
|
|
|
if let Some(ref return_ty) = dispatch.return_type_ty {
|
|
tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::RArrow));
|
|
tt.extend(::quasi::ToTokens::to_tokens(return_ty, ext_cx).into_iter());
|
|
}
|
|
|
|
tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::OpenDelim(::syntax::parse::token::Brace)));
|
|
tt.extend(::quasi::ToTokens::to_tokens(&body, ext_cx).into_iter());
|
|
tt.push(::syntax::ast::TokenTree::Token(_sp, ::syntax::parse::token::CloseDelim(::syntax::parse::token::Brace)));
|
|
|
|
tt
|
|
}));
|
|
|
|
signature.unwrap()
|
|
}
|
|
|
|
fn client_generics(builder: &aster::AstBuilder, interface_map: &InterfaceMap) -> Generics {
|
|
let ty_param = aster::ty_param::TyParamBuilder::new(
|
|
builder.id("S")).trait_bound(
|
|
builder.path().global().ids(&["ipc", "IpcSocket"]).build()
|
|
).build().build();
|
|
|
|
builder.from_generics(interface_map.generics.clone())
|
|
.with_ty_param(ty_param)
|
|
.build()
|
|
}
|
|
|
|
fn client_qualified_ident(cx: &ExtCtxt, builder: &aster::AstBuilder, interface_map: &InterfaceMap) -> P<Ty> {
|
|
let generics = client_generics(builder, interface_map);
|
|
aster::ty::TyBuilder::new().path().segment(interface_map.ident_map.client_ident(cx, builder, &interface_map.original_item))
|
|
.with_generics(generics).build()
|
|
.build()
|
|
}
|
|
|
|
fn client_phantom_ident(builder: &aster::AstBuilder, interface_map: &InterfaceMap) -> P<Ty> {
|
|
let generics = client_generics(builder, interface_map);
|
|
aster::ty::TyBuilder::new().phantom_data()
|
|
.tuple().with_tys(generics.ty_params.iter().map(|x| aster::ty::TyBuilder::new().id(x.ident)))
|
|
.build()
|
|
}
|
|
|
|
/// generates client type for specified server type
|
|
/// for say `Service` it generates `ServiceClient`
|
|
fn push_client_struct(cx: &ExtCtxt, builder: &aster::AstBuilder, interface_map: &InterfaceMap, push: &mut FnMut(Annotatable)) {
|
|
let generics = client_generics(builder, interface_map);
|
|
let client_short_ident = interface_map.ident_map.client_ident(cx, builder, &interface_map.original_item);
|
|
let phantom = client_phantom_ident(builder, interface_map);
|
|
|
|
let client_struct_item = quote_item!(cx,
|
|
pub struct $client_short_ident $generics {
|
|
socket: ::std::sync::RwLock<S>,
|
|
phantom: $phantom,
|
|
});
|
|
|
|
push(Annotatable::Item(client_struct_item.expect(&format!("could not generate client struct for {:?}", client_short_ident.name))));
|
|
}
|
|
|
|
/// pushes generated code for the client class (type declaration and method invocation implementations)
|
|
fn push_client(
|
|
cx: &ExtCtxt,
|
|
builder: &aster::AstBuilder,
|
|
interface_map: &InterfaceMap,
|
|
push: &mut FnMut(Annotatable),
|
|
) {
|
|
push_client_struct(cx, builder, interface_map, push);
|
|
push_client_implementation(cx, builder, interface_map, push);
|
|
push_with_socket_client_implementation(cx, builder, interface_map, push);
|
|
}
|
|
|
|
|
|
fn push_with_socket_client_implementation(
|
|
cx: &ExtCtxt,
|
|
builder: &aster::AstBuilder,
|
|
interface_map: &InterfaceMap,
|
|
push: &mut FnMut(Annotatable))
|
|
{
|
|
let generics = client_generics(builder, interface_map);
|
|
let client_ident = client_qualified_ident(cx, builder, interface_map);
|
|
let where_clause = &generics.where_clause;
|
|
let client_short_ident = interface_map.ident_map.client_ident(cx, builder, &interface_map.original_item);
|
|
|
|
let implement = quote_item!(cx,
|
|
impl $generics ::ipc::WithSocket<S> for $client_ident $where_clause {
|
|
fn init(socket: S) -> $client_ident {
|
|
$client_short_ident {
|
|
socket: ::std::sync::RwLock::new(socket),
|
|
phantom: ::std::marker::PhantomData,
|
|
}
|
|
}
|
|
}).unwrap();
|
|
push(Annotatable::Item(implement));
|
|
}
|
|
|
|
/// pushes full client side code for the original class exposed via ipc
|
|
fn push_client_implementation(
|
|
cx: &ExtCtxt,
|
|
builder: &aster::AstBuilder,
|
|
interface_map: &InterfaceMap,
|
|
push: &mut FnMut(Annotatable),
|
|
) {
|
|
let mut index = -1i32;
|
|
let items = interface_map.dispatches.iter()
|
|
.map(|_| { index = index + 1; P(implement_client_method(cx, builder, index as u16, interface_map)) })
|
|
.collect::<Vec<P<ast::ImplItem>>>();
|
|
|
|
let generics = client_generics(builder, interface_map);
|
|
let client_ident = client_qualified_ident(cx, builder, interface_map);
|
|
let where_clause = &generics.where_clause;
|
|
let endpoint = interface_map.endpoint;
|
|
|
|
let handshake_item = quote_impl_item!(cx,
|
|
pub fn handshake(&self) -> Result<(), ::ipc::Error> {
|
|
let payload = ::ipc::Handshake {
|
|
protocol_version: $endpoint::protocol_version(),
|
|
api_version: $endpoint::api_version(),
|
|
};
|
|
|
|
::ipc::invoke(
|
|
0,
|
|
&Some(::ipc::binary::serialize(&::ipc::BinHandshake::from(payload)).unwrap()),
|
|
&mut *self.socket.write().unwrap());
|
|
|
|
let mut result = vec![0u8; 1];
|
|
if try!(self.socket.write().unwrap().read(&mut result).map_err(|_| ::ipc::Error::HandshakeFailed)) == 1 {
|
|
match result[0] {
|
|
1 => Ok(()),
|
|
_ => Err(::ipc::Error::RemoteServiceUnsupported),
|
|
}
|
|
}
|
|
else { Err(::ipc::Error::HandshakeFailed) }
|
|
}).unwrap();
|
|
|
|
let socket_item = quote_impl_item!(cx,
|
|
#[cfg(test)]
|
|
pub fn socket(&self) -> &::std::sync::RwLock<S> {
|
|
&self.socket
|
|
}).unwrap();
|
|
|
|
let generic_items = vec![P(handshake_item), P(socket_item)];
|
|
|
|
if interface_map.impl_trait.is_some() {
|
|
let trait_ty = builder.id(
|
|
::syntax::print::pprust::path_to_string(
|
|
&interface_map.impl_trait.as_ref().unwrap().path));
|
|
|
|
let implement_trait =
|
|
quote_item!(cx,
|
|
impl $generics $trait_ty for $client_ident $where_clause {
|
|
$items
|
|
}
|
|
).unwrap();
|
|
push(Annotatable::Item(implement_trait));
|
|
|
|
let implement =
|
|
quote_item!(cx,
|
|
impl $generics $client_ident $where_clause {
|
|
$generic_items
|
|
}
|
|
).unwrap();
|
|
push(Annotatable::Item(implement));
|
|
}
|
|
else {
|
|
let pub_items = items.iter().map(|item| {
|
|
let pub_item = item.clone();
|
|
pub_item.map(|mut val| { val.vis = ast::Visibility::Public; val })
|
|
}).collect::<Vec<P<ast::ImplItem>>>();
|
|
|
|
let implement = quote_item!(cx,
|
|
impl $generics $client_ident $where_clause {
|
|
$pub_items
|
|
$generic_items
|
|
}).unwrap();
|
|
push(Annotatable::Item(implement));
|
|
}
|
|
|
|
}
|
|
|
|
/// implements dispatching of system handshake invocation (method_num 0)
|
|
fn implement_handshake_arm(
|
|
cx: &ExtCtxt,
|
|
) -> (ast::Arm, ast::Arm)
|
|
{
|
|
let handshake_deserialize = quote_stmt!(&cx,
|
|
let handshake_payload = ::ipc::binary::deserialize_from::<::ipc::BinHandshake, _>(r).unwrap();
|
|
);
|
|
|
|
let handshake_deserialize_buf = quote_stmt!(&cx,
|
|
let handshake_payload = ::ipc::binary::deserialize::<::ipc::BinHandshake>(buf).unwrap();
|
|
);
|
|
|
|
let handshake_serialize = quote_expr!(&cx,
|
|
::ipc::binary::serialize::<bool>(&Self::handshake(&handshake_payload.to_semver())).unwrap()
|
|
);
|
|
|
|
(
|
|
quote_arm!(&cx, 0 => {
|
|
$handshake_deserialize
|
|
$handshake_serialize
|
|
}),
|
|
quote_arm!(&cx, 0 => {
|
|
$handshake_deserialize_buf
|
|
$handshake_serialize
|
|
}),
|
|
)
|
|
}
|
|
|
|
|
|
fn get_str_from_lit(cx: &ExtCtxt, name: &str, lit: &ast::Lit) -> Result<String, ()> {
|
|
match lit.node {
|
|
ast::LitKind::Str(ref s, _) => Ok(format!("{}", s)),
|
|
_ => {
|
|
cx.span_err(
|
|
lit.span,
|
|
&format!("ipc client_ident annotation `{}` must be a string, not `{}`",
|
|
name,
|
|
::syntax::print::pprust::lit_to_string(lit)));
|
|
|
|
return Err(());
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn get_ipc_meta_items(attr: &ast::Attribute) -> Option<&[P<ast::MetaItem>]> {
|
|
match attr.node.value.node {
|
|
ast::MetaItemKind::List(ref name, ref items) if name == &"ipc" => {
|
|
Some(items)
|
|
}
|
|
_ => None
|
|
}
|
|
}
|
|
|
|
fn client_ident_renamed(cx: &ExtCtxt, item: &ast::Item) -> Option<String> {
|
|
for meta_items in item.attrs().iter().filter_map(get_ipc_meta_items) {
|
|
for meta_item in meta_items {
|
|
match meta_item.node {
|
|
ast::MetaItemKind::NameValue(ref name, ref lit) if name == &"client_ident" => {
|
|
if let Ok(s) = get_str_from_lit(cx, name, lit) {
|
|
return Some(s);
|
|
}
|
|
}
|
|
_ => {
|
|
cx.span_err(
|
|
meta_item.span,
|
|
&format!("unknown client_ident container attribute `{}`",
|
|
::syntax::print::pprust::meta_item_to_string(meta_item)));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
None
|
|
}
|
|
|
|
struct InterfaceMap {
|
|
pub original_item: Item,
|
|
pub item: P<ast::Item>,
|
|
pub dispatches: Vec<Dispatch>,
|
|
pub generics: Generics,
|
|
pub impl_trait: Option<TraitRef>,
|
|
pub ident_map: IdentMap,
|
|
pub endpoint: Ident,
|
|
}
|
|
|
|
struct IdentMap {
|
|
original_path: ast::Path,
|
|
}
|
|
|
|
impl IdentMap {
|
|
fn ident(&self, builder: &aster::AstBuilder) -> Ident {
|
|
builder.id(format!("{}", ::syntax::print::pprust::path_to_string(&self.original_path)))
|
|
}
|
|
|
|
fn client_ident(&self, cx: &ExtCtxt, builder: &aster::AstBuilder, item: &ast::Item) -> Ident {
|
|
if let Some(new_name) = client_ident_renamed(cx, item) {
|
|
builder.id(new_name)
|
|
}
|
|
else {
|
|
builder.id(format!("{}Client", self.original_path.segments[0].identifier))
|
|
}
|
|
}
|
|
}
|
|
|
|
fn ty_ident_map(original_ty: &P<Ty>) -> IdentMap {
|
|
let original_path = match original_ty.node {
|
|
::syntax::ast::TyKind::Path(_, ref path) => path.clone(),
|
|
_ => { panic!("incompatible implementation"); }
|
|
};
|
|
let ident_map = IdentMap { original_path: original_path };
|
|
ident_map
|
|
}
|
|
|
|
/// implements `IpcInterface` for the given class `C`
|
|
fn implement_interface(
|
|
cx: &ExtCtxt,
|
|
builder: &aster::AstBuilder,
|
|
item: &Item,
|
|
push: &mut FnMut(Annotatable),
|
|
) -> Result<InterfaceMap, Error> {
|
|
let (generics, impl_trait, original_ty, dispatch_table) = match item.node {
|
|
ast::ItemKind::Impl(_, _, ref generics, ref impl_trait, ref ty, ref impl_items) => {
|
|
let mut method_signatures = Vec::new();
|
|
for impl_item in impl_items {
|
|
if let ImplItemKind::Method(ref signature, _) = impl_item.node {
|
|
method_signatures.push(NamedSignature { ident: &impl_item.ident, sig: signature });
|
|
}
|
|
}
|
|
|
|
let dispatch_table = method_signatures.iter().map(|named_signature|
|
|
push_invoke_signature_aster(builder, named_signature, push))
|
|
.collect::<Vec<Dispatch>>();
|
|
|
|
(generics, impl_trait.clone(), ty.clone(), dispatch_table)
|
|
},
|
|
ast::ItemKind::Trait(_, ref generics, _, ref trait_items) => {
|
|
let mut method_signatures = Vec::new();
|
|
for trait_item in trait_items {
|
|
if let TraitItemKind::Method(ref signature, _) = trait_item.node {
|
|
method_signatures.push(NamedSignature { ident: &trait_item.ident, sig: signature });
|
|
}
|
|
}
|
|
|
|
let dispatch_table = method_signatures.iter().map(|named_signature|
|
|
push_invoke_signature_aster(builder, named_signature, push))
|
|
.collect::<Vec<Dispatch>>();
|
|
|
|
(
|
|
generics,
|
|
Some(ast::TraitRef {
|
|
path: builder.path().ids(&[item.ident.name]).build(),
|
|
ref_id: item.id,
|
|
}),
|
|
builder.ty().id(item.ident),
|
|
dispatch_table
|
|
)
|
|
},
|
|
_ => {
|
|
cx.span_err(
|
|
item.span,
|
|
"`#[derive(Ipc)]` may only be applied to item implementations");
|
|
return Err(Error);
|
|
},
|
|
};
|
|
let impl_generics = builder.from_generics(generics.clone()).build();
|
|
let where_clause = &impl_generics.where_clause;
|
|
|
|
let dispatch_arms = implement_dispatch_arms(cx, builder, &dispatch_table, false);
|
|
let dispatch_arms_buffered = implement_dispatch_arms(cx, builder, &dispatch_table, true);
|
|
|
|
let (handshake_arm, handshake_arm_buf) = implement_handshake_arm(cx);
|
|
|
|
let ty = ty_ident_map(&original_ty).ident(builder);
|
|
let (interface_endpoint, host_generics) = match impl_trait {
|
|
Some(ref trait_) => (builder.id(::syntax::print::pprust::path_to_string(&trait_.path)), None),
|
|
None => (ty, Some(&impl_generics)),
|
|
};
|
|
|
|
let ipc_item = quote_item!(cx,
|
|
impl $host_generics ::ipc::IpcInterface for $interface_endpoint $where_clause {
|
|
fn dispatch<R>(&self, r: &mut R) -> Vec<u8>
|
|
where R: ::std::io::Read
|
|
{
|
|
let mut method_num = vec![0u8;2];
|
|
match r.read(&mut method_num) {
|
|
Ok(size) if size == 0 => { panic!("method id not supplied" ); }
|
|
Err(e) => { panic!("ipc read error: {:?}, aborting", e); }
|
|
_ => { }
|
|
}
|
|
|
|
// method_num is a 16-bit little-endian unsigned number
|
|
match method_num[1] as u16 + (method_num[0] as u16)*256 {
|
|
// handshake
|
|
$handshake_arm
|
|
// user methods
|
|
$dispatch_arms
|
|
_ => vec![]
|
|
}
|
|
}
|
|
|
|
fn dispatch_buf(&self, method_num: u16, buf: &[u8]) -> Vec<u8>
|
|
{
|
|
match method_num {
|
|
$handshake_arm_buf
|
|
$dispatch_arms_buffered
|
|
_ => vec![]
|
|
}
|
|
}
|
|
}
|
|
).unwrap();
|
|
|
|
Ok(InterfaceMap {
|
|
ident_map: ty_ident_map(&original_ty),
|
|
original_item: item.clone(),
|
|
item: ipc_item,
|
|
dispatches: dispatch_table,
|
|
generics: generics.clone(),
|
|
impl_trait: impl_trait.clone(),
|
|
endpoint: interface_endpoint,
|
|
})
|
|
}
|