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use proc_macro2::TokenStream as TokenStream2;
use quote::{quote};
use syn::{FnArg, ImplItem, ItemImpl, Visibility};
use syn::spanned::Spanned;
use crate::common::is_tokens_empty;
/// 在deploy时需要调用`new`构造出对象
pub (crate) fn generate_deploy(items: &ItemImpl) -> TokenStream2 {
// get Impl name
let i_name = items.self_ty.as_ref();
// get new method
let functions = items.items.iter()
.filter_map(|item| {
match item {
ImplItem::Method(m) => Some(m),
_ => None
}
})
.filter(|method| {
method.sig.ident.to_string().eq("new")
})
.map(|method| {
let mt = &method.sig.ident;
let mut n: usize = 0usize;
let (names, in_types): (Vec<_>, Vec<_>) = method.sig.inputs.iter()
.map(|param| match param {
FnArg::Typed(tp) => {
n += 1;
let index = format!("p_{}", n);
let index_ident = syn::Ident::new(&index, index.span());
(quote! {#index_ident}, &tp.ty)
}
_ => { unreachable!("{}-th error input params for constructor function `new`", n) }
})
.unzip();
let padding_str = if in_types.len() > 0 {
quote! {let _ = <String as scale::Decode>::decode(input).unwrap();}
} else {
quote! {}
};
quote! {
#[no_mangle]
fn deploy() {
std::panic::set_hook(Box::new(|info| {
// let backtrace = Backtrace::new();
let message = match info.payload().downcast_ref::<&'static str>() {
Some(msg) => *msg,
None => match info.payload().downcast_ref::<String>() {
Some(msg) => msg.as_str(),
None => "",
},
};
let (file, line) = if let Some(location) = info.location() {
(location.file(), location.line())
} else {
(Default::default(), Default::default())
};
let res = format!("panic: {} at: {}:{}", message, file, line);
fvm_std::normal::revert(res.as_str());
}));
// 1. fetch input
let input_raw = fvm_std::normal::input();
let input = &mut &input_raw[..];
// 2. decode input
// add the padding string for deploy and invoke params format uniform
// with deploy: "N" + deploy_params
// with invoke: invoke_method + invoke_params
#padding_str
let (#(#names,) *) = (#(<#in_types as scale::Decode>::decode(input).unwrap(),)*);
if input.len() != 0 { // check the input correct
fvm_std::normal::revert("deploy param error");
}
// scale::Encode::encode(&inst.#m_name(#(#names), *))
// 3. call new method
let instance = <#i_name>::#mt(#(#names), *);
// 4. store to ledger
instance.write_ledger("".as_bytes(), "deploy".as_bytes())
}
}
}).collect::<Vec<_>>();
quote! {
#(#functions)*
}
}
pub (crate) fn generate_invoke(items: &ItemImpl) -> TokenStream2 {
// 1. 解析每个方法的签名
// 2. 为每个方法的参数的类型实现decode方法
// 3. 生成call方法
// get Impl name
let i_name = items.self_ty.as_ref();
//为每个方法生成调用的Token
let method_list = items.items.iter()
.filter_map(|item| {
match item {
ImplItem::Method(m) => Some(m),
_ => None
}
})
.filter_map(|method| {
match &method.vis {
Visibility::Public(_) => Some(method),
_ => None
}
})
.map(|method| {
// ignore not `pub` methods
let m_name = &method.sig.ident;
let m_name_str = format!("{}", &method.sig.ident);
// 这里需要排除self参数
let mut n: usize = 0usize;
let (names, in_types): (Vec<_>, Vec<_>) = method.sig.inputs.iter()
.filter(
|param| match param {
FnArg::Typed(_) => { true }
_ => { false }
})
.map(|param| match param {
FnArg::Typed(tp) => {
n += 1;
let index = format!("p_{}", n);
let index_ident = syn::Ident::new(&index, index.span());
(quote! {#index_ident}, &tp.ty)
}
_ => { unreachable!("unreachable") }
})
.unzip();
quote! {
#m_name_str => {
let (#(#names,) *) = (#(<#in_types as scale::Decode>::decode(input).unwrap(),)*);
if input.len() != 0 { // check the input correct
fvm_std::normal::revert("invoke param error");
}
scale::Encode::encode(&inst.#m_name(#(#names), *))
}
}
}).collect::<Vec<_>>();
if is_tokens_empty(&method_list) {
quote! {
#[no_mangle]
fn invoke() {
panic!("no method to call");
}
}
} else {
quote! {
#[no_mangle]
fn invoke() {
std::panic::set_hook(Box::new(|info| {
// let backtrace = Backtrace::new();
let message = match info.payload().downcast_ref::<&'static str>() {
Some(msg) => *msg,
None => match info.payload().downcast_ref::<String>() {
Some(msg) => msg.as_str(),
None => "",
},
};
let (file, line) = if let Some(location) = info.location() {
(location.file(), location.line())
} else {
(Default::default(), Default::default())
};
// NOTE: trace not support with wasm now, consider it later
// let trace = backtrace.frames().iter()
// .map(|frame| {
// let mut frame_str = String::new();
// for symbol in frame.symbols() {
// if let Some(name) = symbol.name() {
// frame_str.push_str(name.to_string().as_str());
// }
// if let Some(path) = symbol.filename() {
// frame_str.push_str(path.to_str().get_or_insert(""));
// frame_str.push_str(":");
// }
// if let Some(number) = symbol.lineno() {
// frame_str.push_str(number.to_string().as_str());
// }
// }
// frame_str
// })
// .fold(String::new(), |mut acc, x| {
// acc.push_str(format!(" {}\n", x).as_str());
// acc
// });
// let res = format!("panic: {} at: {}:{}\n{}", message, file, line, trace);
let res = format!("panic: {} at: {}:{}", message, file, line);
fvm_std::normal::revert(res.as_str());
}));
// 1. restore obj form ledger
let mut inst = <#i_name>::read_ledger("".as_bytes(), "".as_bytes());
// 2. fetch input and resolve call method name
let input_raw = fvm_std::normal::input();
let input = &mut &input_raw[..];
let m_name = <String as ::scale::Decode>::decode(input).unwrap();
// 3. deliver method and call
let res = match m_name.as_str() {
#(#method_list)*
_ => {
fvm_std::normal::revert(format!("no such method to call: {}", m_name).as_str());
}
};
// 4. store to ledger
inst.write_ledger("".as_bytes(), "invoke".as_bytes());
// 5. return call result
fvm_std::normal::ret(&*res);
}
}
}
}