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refactor: pull reth/common/rlp up to reth/rlp (#1146)

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This commit is contained in:
Georgios Konstantopoulos
2023-02-02 13:54:13 -08:00
committed by GitHub
parent 16b3f1677c
commit 1f64d8e9d7
31 changed files with 21 additions and 21 deletions
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15
crates/rlp/rlp-derive/Cargo.toml Normal file
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[package]
name = "reth-rlp-derive"
version = "0.1.1"
license = "Apache-2.0"
edition = "2021"
description = "Procedural macros for reth-rlp"
repository = "https://github.com/paradigmxyz/reth"
[lib]
proc-macro = true
[dependencies]
syn = "1"
quote = "1"
proc-macro2 = "1"

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crates/rlp/rlp-derive/LICENCE Normal file
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crates/rlp/rlp-derive/README.md Normal file
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## RLP derive crate
Forked from an earlier Apache licenced version of the `fastrlp-derive` crate, before it changed licence to GPL.
NOTE: The Rust fastrlp implementation is itself a port of the [Golang Apache licensed fastrlp](https://github.com/umbracle/fastrlp)

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crates/rlp/rlp-derive/src/de.rs Normal file
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use proc_macro2::TokenStream;
use quote::quote;
use crate::utils::has_attribute;
pub(crate) fn impl_decodable(ast: &syn::DeriveInput) -> TokenStream {
let body = if let syn::Data::Struct(s) = &ast.data {
s
} else {
panic!("#[derive(RlpDecodable)] is only defined for structs.");
};
let stmts: Vec<_> =
body.fields.iter().enumerate().map(|(i, field)| decodable_field(i, field)).collect();
let name = &ast.ident;
let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
let impl_block = quote! {
impl #impl_generics reth_rlp::Decodable for #name #ty_generics #where_clause {
fn decode(mut buf: &mut &[u8]) -> Result<Self, reth_rlp::DecodeError> {
let b = &mut &**buf;
let rlp_head = reth_rlp::Header::decode(b)?;
if !rlp_head.list {
return Err(reth_rlp::DecodeError::UnexpectedString);
}
let started_len = b.len();
let this = Self {
#(#stmts)*
};
let consumed = started_len - b.len();
if consumed != rlp_head.payload_length {
return Err(reth_rlp::DecodeError::ListLengthMismatch {
expected: rlp_head.payload_length,
got: consumed,
});
}
*buf = *b;
Ok(this)
}
}
};
quote! {
const _: () = {
extern crate reth_rlp;
#impl_block
};
}
}
pub(crate) fn impl_decodable_wrapper(ast: &syn::DeriveInput) -> TokenStream {
let body = if let syn::Data::Struct(s) = &ast.data {
s
} else {
panic!("#[derive(RlpEncodableWrapper)] is only defined for structs.");
};
assert_eq!(
body.fields.iter().count(),
1,
"#[derive(RlpEncodableWrapper)] is only defined for structs with one field."
);
let name = &ast.ident;
let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
let impl_block = quote! {
impl #impl_generics reth_rlp::Decodable for #name #ty_generics #where_clause {
fn decode(buf: &mut &[u8]) -> Result<Self, reth_rlp::DecodeError> {
Ok(Self(reth_rlp::Decodable::decode(buf)?))
}
}
};
quote! {
const _: () = {
extern crate reth_rlp;
#impl_block
};
}
}
fn decodable_field(index: usize, field: &syn::Field) -> TokenStream {
let id = if let Some(ident) = &field.ident {
quote! { #ident }
} else {
let index = syn::Index::from(index);
quote! { #index }
};
if has_attribute(field, "default") {
quote! { #id: Default::default(), }
} else {
quote! { #id: reth_rlp::Decodable::decode(b)?, }
}
}

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crates/rlp/rlp-derive/src/en.rs Normal file
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use proc_macro2::TokenStream;
use quote::quote;
use crate::utils::has_attribute;
pub(crate) fn impl_encodable(ast: &syn::DeriveInput) -> TokenStream {
let body = if let syn::Data::Struct(s) = &ast.data {
s
} else {
panic!("#[derive(RlpEncodable)] is only defined for structs.");
};
let (length_stmts, stmts): (Vec<_>, Vec<_>) = body
.fields
.iter()
.enumerate()
.filter(|(_, field)| !has_attribute(field, "skip"))
.map(|(i, field)| (encodable_length(i, field), encodable_field(i, field)))
.unzip();
let name = &ast.ident;
let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
let impl_block = quote! {
trait E {
fn rlp_header(&self) -> reth_rlp::Header;
}
impl #impl_generics E for #name #ty_generics #where_clause {
fn rlp_header(&self) -> reth_rlp::Header {
let mut rlp_head = reth_rlp::Header { list: true, payload_length: 0 };
#(#length_stmts)*
rlp_head
}
}
impl #impl_generics reth_rlp::Encodable for #name #ty_generics #where_clause {
fn length(&self) -> usize {
let rlp_head = E::rlp_header(self);
return reth_rlp::length_of_length(rlp_head.payload_length) + rlp_head.payload_length;
}
fn encode(&self, out: &mut dyn reth_rlp::BufMut) {
E::rlp_header(self).encode(out);
#(#stmts)*
}
}
};
quote! {
const _: () = {
extern crate reth_rlp;
#impl_block
};
}
}
pub(crate) fn impl_encodable_wrapper(ast: &syn::DeriveInput) -> TokenStream {
let body = if let syn::Data::Struct(s) = &ast.data {
s
} else {
panic!("#[derive(RlpEncodableWrapper)] is only defined for structs.");
};
let ident = {
let fields: Vec<_> = body.fields.iter().collect();
if fields.len() == 1 {
let field = fields.first().expect("fields.len() == 1; qed");
field_ident(0, field)
} else {
panic!("#[derive(RlpEncodableWrapper)] is only defined for structs with one field.")
}
};
let name = &ast.ident;
let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
let impl_block = quote! {
impl #impl_generics reth_rlp::Encodable for #name #ty_generics #where_clause {
fn length(&self) -> usize {
self.#ident.length()
}
fn encode(&self, out: &mut dyn reth_rlp::BufMut) {
self.#ident.encode(out)
}
}
};
quote! {
const _: () = {
extern crate reth_rlp;
#impl_block
};
}
}
pub(crate) fn impl_max_encoded_len(ast: &syn::DeriveInput) -> TokenStream {
let body = if let syn::Data::Struct(s) = &ast.data {
s
} else {
panic!("#[derive(RlpMaxEncodedLen)] is only defined for structs.");
};
let stmts: Vec<_> = body
.fields
.iter()
.enumerate()
.filter(|(_, field)| !has_attribute(field, "skip"))
.map(|(index, field)| encodable_max_length(index, field))
.collect();
let name = &ast.ident;
let impl_block = quote! {
unsafe impl reth_rlp::MaxEncodedLen<{ reth_rlp::const_add(reth_rlp::length_of_length(#(#stmts)*), #(#stmts)*) }> for #name {}
unsafe impl reth_rlp::MaxEncodedLenAssoc for #name {
const LEN: usize = { reth_rlp::const_add(reth_rlp::length_of_length(#(#stmts)*), { #(#stmts)* }) };
}
};
quote! {
const _: () = {
extern crate reth_rlp;
#impl_block
};
}
}
fn field_ident(index: usize, field: &syn::Field) -> TokenStream {
if let Some(ident) = &field.ident {
quote! { #ident }
} else {
let index = syn::Index::from(index);
quote! { #index }
}
}
fn encodable_length(index: usize, field: &syn::Field) -> TokenStream {
let ident = field_ident(index, field);
quote! { rlp_head.payload_length += reth_rlp::Encodable::length(&self.#ident); }
}
fn encodable_max_length(index: usize, field: &syn::Field) -> TokenStream {
let fieldtype = &field.ty;
if index == 0 {
quote! { <#fieldtype as reth_rlp::MaxEncodedLenAssoc>::LEN }
} else {
quote! { + <#fieldtype as reth_rlp::MaxEncodedLenAssoc>::LEN }
}
}
fn encodable_field(index: usize, field: &syn::Field) -> TokenStream {
let ident = field_ident(index, field);
let id = quote! { self.#ident };
quote! { reth_rlp::Encodable::encode(&#id, out); }
}

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crates/rlp/rlp-derive/src/lib.rs Normal file
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#![warn(missing_docs, unreachable_pub)]
#![deny(unused_must_use)]
#![doc(test(
no_crate_inject,
attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables))
))]
//! Derive macro for `#[derive(RlpEncodable, RlpDecodable)]`.
//!
//! For example of usage see `./tests/rlp.rs`.
//!
//! This library also supports up to 1 `#[rlp(default)]` in a struct,
//! which is similar to [`#[serde(default)]`](https://serde.rs/field-attrs.html#default)
//! with the caveat that we use the `Default` value if
//! the field deserialization fails, as we don't serialize field
//! names and there is no way to tell if it is present or not.
extern crate proc_macro;
mod de;
mod en;
mod utils;
use de::*;
use en::*;
use proc_macro::TokenStream;
/// Derives `Encodable` for the type which encodes the all fields as list: `<rlp-header, fields...>`
#[proc_macro_derive(RlpEncodable, attributes(rlp))]
pub fn encodable(input: TokenStream) -> TokenStream {
let ast = match syn::parse(input) {
Ok(ast) => ast,
Err(err) => return err.to_compile_error().into(),
};
let gen = impl_encodable(&ast);
gen.into()
}
/// Derives `Encodable` for the type which encodes the fields as-is, without a header: `<fields...>`
#[proc_macro_derive(RlpEncodableWrapper, attributes(rlp))]
pub fn encodable_wrapper(input: TokenStream) -> TokenStream {
let ast = match syn::parse(input) {
Ok(ast) => ast,
Err(err) => return err.to_compile_error().into(),
};
let gen = impl_encodable_wrapper(&ast);
gen.into()
}
/// Derives `MaxEncodedLen` for types of constant size.
#[proc_macro_derive(RlpMaxEncodedLen, attributes(rlp))]
pub fn max_encoded_len(input: TokenStream) -> TokenStream {
let ast = match syn::parse(input) {
Ok(ast) => ast,
Err(err) => return err.to_compile_error().into(),
};
let gen = impl_max_encoded_len(&ast);
gen.into()
}
/// Derives `Decodable` for the type whose implementation expects an rlp-list input: `<rlp-header,
/// fields...>`
///
/// This is the inverse of `RlpEncodable`.
#[proc_macro_derive(RlpDecodable, attributes(rlp))]
pub fn decodable(input: TokenStream) -> TokenStream {
let ast = match syn::parse(input) {
Ok(ast) => ast,
Err(err) => return err.to_compile_error().into(),
};
let gen = impl_decodable(&ast);
gen.into()
}
/// Derives `Decodable` for the type whose implementation expects only the individual fields
/// encoded: `<fields...>`
///
/// This is the inverse of `RlpEncodableWrapper`.
#[proc_macro_derive(RlpDecodableWrapper, attributes(rlp))]
pub fn decodable_wrapper(input: TokenStream) -> TokenStream {
let ast = syn::parse(input).unwrap();
let gen = impl_decodable_wrapper(&ast);
gen.into()
}

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crates/rlp/rlp-derive/src/utils.rs Normal file
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use syn::{Field, Meta, NestedMeta};
pub(crate) fn has_attribute(field: &Field, attr_name: &str) -> bool {
field.attrs.iter().any(|attr| {
if attr.path.is_ident("rlp") {
if let Ok(Meta::List(meta)) = attr.parse_meta() {
if let Some(NestedMeta::Meta(meta)) = meta.nested.first() {
return meta.path().is_ident(attr_name)
}
return false
} else {
}
}
false
})
}