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Use the generated DispatchError instead of the hardcoded Substrate one (
paritytech#394) * WIP DispatchError generic param * main crate now compiling with new E generic param for DispatchError * Remove E param from RpcClient since it doesn't really need it * Point to generated DispatchError in codegen so no need for additional param there * More error hunting; cargo check --all-targets passes now * Use our own RuntimeVersion struct (for now) to avoid error decoding into sp_version::RuntimeVersion * cargo fmt * fix docs and expose private documented thing that I think should be pub * move error info to compile time so that we can make DispatchError a little nicer to work with * cargo fmt * clippy * Rework error handling to remove <E> param in most cases * fix Error doc ambiguity (hopefully) * doc tweaks * docs: remove dismbiguation thing that isn't needed now * One more Error<E> that can be a BasicError * rewrite pallet errors thing into normal loops to tidy * tidy errors codegen a little * tidy examples/custom_type_derives.rs a little * cargo fmt * silcnce clippy in example
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,162 @@ | ||
| // Copyright 2019-2022 Parity Technologies (UK) Ltd. | ||
| // This file is part of subxt. | ||
| // | ||
| // subxt is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // subxt is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU General Public License | ||
| // along with subxt. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
||
| use frame_metadata::v14::RuntimeMetadataV14; | ||
| use proc_macro2::{ | ||
| Span as Span2, | ||
| TokenStream as TokenStream2, | ||
| }; | ||
| use quote::quote; | ||
|
|
||
| /// Tokens which allow us to provide static error information in the generated output. | ||
| pub struct ErrorDetails { | ||
| /// This type definition will be used in the `dispatch_error_impl_fn` and is | ||
| /// expected to be generated somewhere in scope for that to be possible. | ||
| pub type_def: TokenStream2, | ||
| // A function which will live in an impl block for our `DispatchError`, | ||
| // to statically return details for known error types: | ||
| pub dispatch_error_impl_fn: TokenStream2, | ||
| } | ||
|
|
||
| impl ErrorDetails { | ||
| fn emit_compile_error(err: &str) -> ErrorDetails { | ||
| let err_lit_str = syn::LitStr::new(err, Span2::call_site()); | ||
| ErrorDetails { | ||
| type_def: quote!(), | ||
| dispatch_error_impl_fn: quote!(compile_error!(#err_lit_str)), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// The purpose of this is to enumerate all of the possible `(module_index, error_index)` error | ||
| /// variants, so that we can convert `u8` error codes inside a generated `DispatchError` into | ||
| /// nicer error strings with documentation. To do this, we emit the type we'll return instances of, | ||
| /// and a function that returns such an instance for all of the error codes seen in the metadata. | ||
| pub fn generate_error_details(metadata: &RuntimeMetadataV14) -> ErrorDetails { | ||
| let errors = match pallet_errors(metadata) { | ||
| Ok(errors) => errors, | ||
| Err(e) => { | ||
| let err_string = | ||
| format!("Failed to generate error details from metadata: {}", e); | ||
| return ErrorDetails::emit_compile_error(&err_string) | ||
| } | ||
| }; | ||
|
|
||
| let match_body_items = errors.into_iter().map(|err| { | ||
| let docs = err.docs; | ||
| let pallet_index = err.pallet_index; | ||
| let error_index = err.error_index; | ||
| let pallet_name = err.pallet; | ||
| let error_name = err.error; | ||
|
|
||
| quote! { | ||
| (#pallet_index, #error_index) => Some(ErrorDetails { | ||
| pallet: #pallet_name, | ||
| error: #error_name, | ||
| docs: #docs | ||
| }) | ||
| } | ||
| }); | ||
|
|
||
| ErrorDetails { | ||
| type_def: quote! { | ||
| pub struct ErrorDetails { | ||
| pub pallet: &'static str, | ||
| pub error: &'static str, | ||
| pub docs: &'static str, | ||
| } | ||
| }, | ||
| dispatch_error_impl_fn: quote! { | ||
| pub fn details(&self) -> Option<ErrorDetails> { | ||
| if let Self::Module { index, error } = self { | ||
| match (index, error) { | ||
| #( #match_body_items ),*, | ||
| _ => None | ||
| } | ||
| } else { | ||
| None | ||
| } | ||
| } | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| fn pallet_errors( | ||
| metadata: &RuntimeMetadataV14, | ||
| ) -> Result<Vec<ErrorMetadata>, InvalidMetadataError> { | ||
| let get_type_def_variant = |type_id: u32| { | ||
| let ty = metadata | ||
| .types | ||
| .resolve(type_id) | ||
| .ok_or(InvalidMetadataError::MissingType(type_id))?; | ||
| if let scale_info::TypeDef::Variant(var) = ty.type_def() { | ||
| Ok(var) | ||
| } else { | ||
| Err(InvalidMetadataError::TypeDefNotVariant(type_id)) | ||
| } | ||
| }; | ||
|
|
||
| let mut pallet_errors = vec![]; | ||
| for pallet in &metadata.pallets { | ||
| let error = match &pallet.error { | ||
| Some(err) => err, | ||
| None => continue, | ||
| }; | ||
|
|
||
| let type_def_variant = get_type_def_variant(error.ty.id())?; | ||
| for var in type_def_variant.variants().iter() { | ||
| pallet_errors.push(ErrorMetadata { | ||
| pallet_index: pallet.index, | ||
| error_index: var.index(), | ||
| pallet: pallet.name.clone(), | ||
| error: var.name().clone(), | ||
| docs: var.docs().join("\n"), | ||
| }); | ||
| } | ||
| } | ||
|
|
||
| Ok(pallet_errors) | ||
| } | ||
|
|
||
| /// Information about each error that we find in the metadata; | ||
| /// used to generate the static error information. | ||
| #[derive(Clone, Debug)] | ||
| struct ErrorMetadata { | ||
| pub pallet_index: u8, | ||
| pub error_index: u8, | ||
| pub pallet: String, | ||
| pub error: String, | ||
| pub docs: String, | ||
| } | ||
|
|
||
| #[derive(Debug)] | ||
| enum InvalidMetadataError { | ||
| MissingType(u32), | ||
| TypeDefNotVariant(u32), | ||
| } | ||
|
|
||
| impl std::fmt::Display for InvalidMetadataError { | ||
| fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { | ||
| match self { | ||
| InvalidMetadataError::MissingType(n) => { | ||
| write!(f, "Type {} missing from type registry", n) | ||
| } | ||
| InvalidMetadataError::TypeDefNotVariant(n) => { | ||
| write!(f, "Type {} was not a variant/enum type", n) | ||
| } | ||
| } | ||
| } | ||
| } |
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