498 lines
21 KiB
Rust
498 lines
21 KiB
Rust
use std::{iter::FromIterator, str::FromStr};
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use proc_macro::TokenStream;
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use proc_macro2::Ident;
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use quote::quote;
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use syn::{
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ext::IdentExt, punctuated::Punctuated, Block, Error, FnArg, ImplItem, ItemImpl, Pat,
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ReturnType, Token, Type, TypeReference,
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};
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use crate::{
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args::{self, ComplexityType, RenameRuleExt, RenameTarget},
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output_type::OutputType,
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utils::{
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extract_input_args, gen_deprecation, generate_default, generate_guards, get_cfg_attrs,
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get_crate_name, get_rustdoc, get_type_path_and_name, parse_complexity_expr,
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parse_graphql_attrs, remove_graphql_attrs, visible_fn, GeneratorResult,
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},
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};
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pub fn generate(
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object_args: &args::ComplexObject,
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item_impl: &mut ItemImpl,
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) -> GeneratorResult<TokenStream> {
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let crate_name = get_crate_name(object_args.internal);
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let (self_ty, _) = get_type_path_and_name(item_impl.self_ty.as_ref())?;
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let generics = &item_impl.generics;
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let where_clause = &item_impl.generics.where_clause;
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let mut resolvers = Vec::new();
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let mut schema_fields = Vec::new();
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// Computation of the derivated fields
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let mut derived_impls = vec![];
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for item in &mut item_impl.items {
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if let ImplItem::Method(method) = item {
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let method_args: args::ComplexObjectField =
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parse_graphql_attrs(&method.attrs)?.unwrap_or_default();
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for derived in method_args.derived {
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if derived.name.is_some() && derived.into.is_some() {
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let base_function_name = &method.sig.ident;
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let name = derived.name.unwrap();
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let with = derived.with;
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let into = Type::Verbatim(
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proc_macro2::TokenStream::from_str(&derived.into.unwrap()).unwrap(),
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);
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let mut new_impl = method.clone();
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new_impl.sig.ident = name;
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new_impl.sig.output =
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syn::parse2::<ReturnType>(quote! { -> #crate_name::Result<#into> })
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.expect("invalid result type");
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let should_create_context = new_impl
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.sig
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.inputs
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.iter()
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.nth(1)
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.map(|x| {
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if let FnArg::Typed(pat) = x {
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if let Type::Reference(TypeReference { elem, .. }) = &*pat.ty {
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if let Type::Path(path) = elem.as_ref() {
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return path.path.segments.last().unwrap().ident
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!= "Context";
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}
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}
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};
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true
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})
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.unwrap_or(true);
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if should_create_context {
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let arg_ctx = syn::parse2::<FnArg>(quote! { ctx: &Context<'_> })
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.expect("invalid arg type");
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new_impl.sig.inputs.insert(1, arg_ctx);
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}
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let other_atts: Punctuated<Ident, Token![,]> = Punctuated::from_iter(
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new_impl
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.sig
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.inputs
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.iter()
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.filter_map(|x| match x {
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FnArg::Typed(pat) => match &*pat.pat {
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Pat::Ident(ident) => Some(Ok(ident.ident.clone())),
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_ => Some(Err(Error::new_spanned(
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&pat,
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"Must be a simple argument",
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))),
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},
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FnArg::Receiver(_) => None,
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})
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.collect::<Result<Vec<Ident>, Error>>()?
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.into_iter(),
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);
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let new_block = match with {
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Some(with) => quote!({
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::std::result::Result::Ok(#with(#self_ty::#base_function_name(&self, #other_atts).await?))
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}),
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None => quote!({
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{
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::std::result::Result::Ok(#self_ty::#base_function_name(&self, #other_atts).await?.into())
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}
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}),
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};
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new_impl.block = syn::parse2::<Block>(new_block).expect("invalid block");
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derived_impls.push(ImplItem::Method(new_impl));
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}
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}
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}
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}
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item_impl.items.append(&mut derived_impls);
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for item in &mut item_impl.items {
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if let ImplItem::Method(method) = item {
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let method_args: args::ComplexObjectField =
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parse_graphql_attrs(&method.attrs)?.unwrap_or_default();
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if method_args.skip {
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remove_graphql_attrs(&mut method.attrs);
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continue;
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}
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let cfg_attrs = get_cfg_attrs(&method.attrs);
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if method_args.flatten {
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// Only used to inject the context placeholder if required.
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extract_input_args::<args::Argument>(&crate_name, method)?;
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let ty = match &method.sig.output {
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ReturnType::Type(_, ty) => OutputType::parse(ty)?,
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ReturnType::Default => {
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return Err(Error::new_spanned(
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&method.sig.output,
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"Flatten resolver must have a return type",
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)
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.into())
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}
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};
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let ty = ty.value_type();
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let ident = &method.sig.ident;
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schema_fields.push(quote! {
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#crate_name::static_assertions::assert_impl_one!(#ty: #crate_name::ObjectType);
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<#ty>::create_type_info(registry);
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if let #crate_name::registry::MetaType::Object { fields: obj_fields, .. } =
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registry.create_fake_output_type::<#ty>() {
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fields.extend(obj_fields);
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}
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});
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resolvers.push(quote! {
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#(#cfg_attrs)*
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if let ::std::option::Option::Some(value) = #crate_name::ContainerType::resolve_field(&self.#ident(ctx).await, ctx).await? {
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return ::std::result::Result::Ok(std::option::Option::Some(value));
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}
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});
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remove_graphql_attrs(&mut method.attrs);
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continue;
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}
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let field_name = method_args.name.clone().unwrap_or_else(|| {
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object_args
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.rename_fields
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.rename(method.sig.ident.unraw().to_string(), RenameTarget::Field)
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});
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let field_desc = get_rustdoc(&method.attrs)?
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.map(|s| quote! { ::std::option::Option::Some(#s) })
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.unwrap_or_else(|| quote! {::std::option::Option::None});
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let field_deprecation = gen_deprecation(&method_args.deprecation, &crate_name);
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let external = method_args.external;
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let requires = match &method_args.requires {
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Some(requires) => quote! { ::std::option::Option::Some(#requires) },
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None => quote! { ::std::option::Option::None },
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};
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let provides = match &method_args.provides {
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Some(provides) => quote! { ::std::option::Option::Some(#provides) },
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None => quote! { ::std::option::Option::None },
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};
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let cache_control = {
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let public = method_args.cache_control.is_public();
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let max_age = method_args.cache_control.max_age;
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quote! {
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#crate_name::CacheControl {
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public: #public,
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max_age: #max_age,
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}
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}
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};
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let mut args = extract_input_args::<args::Argument>(&crate_name, method)?;
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let mut schema_args = Vec::new();
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let mut use_params = Vec::new();
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let mut get_params = Vec::new();
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let mut is_oneof_field = false;
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if method_args.oneof {
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is_oneof_field = true;
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if args.len() != 1 {
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return Err(Error::new_spanned(
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&method,
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"The `oneof` field requires exactly one argument.",
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)
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.into());
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}
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let (ident, ty, argument) = args.pop().unwrap();
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schema_args.push(quote! {
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#crate_name::static_assertions::assert_impl_one!(#ty: #crate_name::OneofObjectType);
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if let #crate_name::registry::MetaType::InputObject { input_fields, .. } = registry.create_fake_input_type::<#ty>() {
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args.extend(input_fields);
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}
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});
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use_params.push(quote! { #ident });
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let param_ident = &ident.ident;
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let process_with = match argument.process_with.as_ref() {
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Some(fn_path) => {
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let fn_path: syn::ExprPath = syn::parse_str(fn_path)?;
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quote! {
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#fn_path(&mut #param_ident);
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}
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}
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None => Default::default(),
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};
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let validators = argument
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.validator
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.clone()
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.unwrap_or_default()
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.create_validators(
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&crate_name,
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quote!(&#ident),
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quote!(#ty),
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Some(quote!(.map_err(|err| err.into_server_error(__pos)))),
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)?;
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let mut non_mut_ident = ident.clone();
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non_mut_ident.mutability = None;
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get_params.push(quote! {
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#[allow(non_snake_case, unused_variables, unused_mut)]
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let (__pos, mut #non_mut_ident) = ctx.oneof_param_value::<#ty>()?;
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#process_with
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#validators
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#[allow(non_snake_case, unused_variables)]
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let #ident = #non_mut_ident;
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});
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} else {
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for (
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ident,
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ty,
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args::Argument {
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name,
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desc,
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default,
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default_with,
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validator,
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process_with,
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visible,
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secret,
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..
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},
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) in &args
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{
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let name = name.clone().unwrap_or_else(|| {
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object_args
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.rename_args
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.rename(ident.ident.unraw().to_string(), RenameTarget::Argument)
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});
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let desc = desc
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.as_ref()
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.map(|s| quote! {::std::option::Option::Some(#s)})
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.unwrap_or_else(|| quote! {::std::option::Option::None});
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let default = generate_default(default, default_with)?;
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let schema_default = default
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.as_ref()
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.map(|value| {
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quote! {
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::std::option::Option::Some(::std::string::ToString::to_string(
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&<#ty as #crate_name::InputType>::to_value(&#value)
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))
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}
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})
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.unwrap_or_else(|| quote! {::std::option::Option::None});
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let visible = visible_fn(visible);
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schema_args.push(quote! {
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args.insert(::std::borrow::ToOwned::to_owned(#name), #crate_name::registry::MetaInputValue {
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name: #name,
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description: #desc,
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ty: <#ty as #crate_name::InputType>::create_type_info(registry),
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default_value: #schema_default,
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visible: #visible,
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is_secret: #secret,
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});
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});
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let param_ident = &ident.ident;
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use_params.push(quote! { #param_ident });
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let default = match default {
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Some(default) => {
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quote! { ::std::option::Option::Some(|| -> #ty { #default }) }
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}
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None => quote! { ::std::option::Option::None },
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};
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let param_ident = &ident.ident;
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let process_with = match process_with.as_ref() {
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Some(fn_path) => {
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let fn_path: syn::ExprPath = syn::parse_str(fn_path)?;
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quote! {
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#fn_path(&mut #param_ident);
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}
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}
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None => Default::default(),
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};
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let validators = validator.clone().unwrap_or_default().create_validators(
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&crate_name,
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quote!(&#ident),
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quote!(ty),
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Some(quote!(.map_err(|err| err.into_server_error(__pos)))),
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)?;
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let mut non_mut_ident = ident.clone();
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non_mut_ident.mutability = None;
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get_params.push(quote! {
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#[allow(non_snake_case, unused_mut)]
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let (__pos, mut #non_mut_ident) = ctx.param_value::<#ty>(#name, #default)?;
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#process_with
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#validators
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#[allow(non_snake_case)]
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let #ident = #non_mut_ident;
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});
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}
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}
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let ty = match &method.sig.output {
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ReturnType::Type(_, ty) => OutputType::parse(ty)?,
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ReturnType::Default => {
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return Err(Error::new_spanned(
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&method.sig.output,
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"Resolver must have a return type",
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)
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.into())
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}
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};
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let schema_ty = ty.value_type();
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let visible = visible_fn(&method_args.visible);
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let complexity = if let Some(complexity) = &method_args.complexity {
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match complexity {
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ComplexityType::Const(n) => {
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quote! { ::std::option::Option::Some(#crate_name::registry::ComplexityType::Const(#n)) }
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}
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ComplexityType::Fn(s) => {
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let (variables, expr) = parse_complexity_expr(s)?;
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let mut parse_args = Vec::new();
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for variable in variables {
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if let Some((
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ident,
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ty,
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args::Argument {
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name,
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default,
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default_with,
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..
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},
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)) = args
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.iter()
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.find(|(pat_ident, _, _)| pat_ident.ident == variable)
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{
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let default = match generate_default(default, default_with)? {
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Some(default) => {
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quote! { ::std::option::Option::Some(|| -> #ty { #default }) }
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}
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None => quote! { ::std::option::Option::None },
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};
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let name = name.clone().unwrap_or_else(|| {
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object_args.rename_args.rename(
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ident.ident.unraw().to_string(),
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RenameTarget::Argument,
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)
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});
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parse_args.push(quote! {
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let #ident: #ty = __ctx.param_value(__variables_definition, __field, #name, #default)?;
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});
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}
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}
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quote! {
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Some(#crate_name::registry::ComplexityType::Fn(|__ctx, __variables_definition, __field, child_complexity| {
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#(#parse_args)*
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Ok(#expr)
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}))
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}
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}
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}
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} else {
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quote! { ::std::option::Option::None }
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};
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schema_fields.push(quote! {
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#(#cfg_attrs)*
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fields.push((#field_name.to_string(), #crate_name::registry::MetaField {
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name: ::std::borrow::ToOwned::to_owned(#field_name),
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description: #field_desc,
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args: {
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let mut args = #crate_name::indexmap::IndexMap::new();
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#(#schema_args)*
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args
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},
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ty: <#schema_ty as #crate_name::OutputType>::create_type_info(registry),
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deprecation: #field_deprecation,
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cache_control: #cache_control,
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external: #external,
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provides: #provides,
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requires: #requires,
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visible: #visible,
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compute_complexity: #complexity,
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oneof: #is_oneof_field,
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}));
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});
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let field_ident = &method.sig.ident;
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if let OutputType::Value(inner_ty) = &ty {
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let block = &method.block;
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let new_block = quote!({
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{
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::std::result::Result::Ok(async move {
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let value:#inner_ty = #block;
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value
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}.await)
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}
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});
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method.block = syn::parse2::<Block>(new_block).expect("invalid block");
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method.sig.output =
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syn::parse2::<ReturnType>(quote! { -> #crate_name::Result<#inner_ty> })
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.expect("invalid result type");
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}
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let resolve_obj = quote! {
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{
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let res = self.#field_ident(ctx, #(#use_params),*).await;
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res.map_err(|err| ::std::convert::Into::<#crate_name::Error>::into(err).into_server_error(ctx.item.pos))
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}
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};
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let guard_map_err = quote! {
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.map_err(|err| err.into_server_error(ctx.item.pos))
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};
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let guard = match method_args.guard.as_ref().or(object_args.guard.as_ref()) {
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Some(code) => Some(generate_guards(&crate_name, code, guard_map_err)?),
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None => None,
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};
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resolvers.push(quote! {
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#(#cfg_attrs)*
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if ctx.item.node.name.node == #field_name {
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let f = async move {
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#(#get_params)*
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#guard
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#resolve_obj
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};
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let obj = f.await.map_err(|err| ctx.set_error_path(err))?;
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let ctx_obj = ctx.with_selection_set(&ctx.item.node.selection_set);
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return #crate_name::OutputType::resolve(&obj, &ctx_obj, ctx.item).await.map(::std::option::Option::Some);
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}
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});
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remove_graphql_attrs(&mut method.attrs);
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}
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}
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let expanded = quote! {
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#item_impl
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#[allow(clippy::all, clippy::pedantic)]
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#[#crate_name::async_trait::async_trait]
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impl #generics #crate_name::ComplexObject for #self_ty #where_clause {
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fn fields(registry: &mut #crate_name::registry::Registry) -> ::std::vec::Vec<(::std::string::String, #crate_name::registry::MetaField)> {
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let mut fields = ::std::vec::Vec::new();
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#(#schema_fields)*
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fields
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}
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async fn resolve_field(&self, ctx: &#crate_name::Context<'_>) -> #crate_name::ServerResult<::std::option::Option<#crate_name::Value>> {
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#(#resolvers)*
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::std::result::Result::Ok(::std::option::Option::None)
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}
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}
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};
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Ok(expanded.into())
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}
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