409 lines
17 KiB
Rust
409 lines
17 KiB
Rust
use proc_macro::TokenStream;
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use quote::quote;
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use syn::ext::IdentExt;
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use syn::{
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Block, Error, FnArg, ImplItem, ItemImpl, Pat, ReturnType, Type, TypeImplTrait, TypeParamBound,
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TypeReference,
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};
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use crate::args::{self, RenameRuleExt, RenameTarget, SubscriptionField};
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use crate::output_type::OutputType;
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use crate::utils::{
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generate_default, generate_guards, generate_validator, get_cfg_attrs, get_crate_name,
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get_param_getter_ident, get_rustdoc, get_type_path_and_name, parse_graphql_attrs,
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remove_graphql_attrs, GeneratorResult,
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};
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pub fn generate(
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subscription_args: &args::Subscription,
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item_impl: &mut ItemImpl,
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) -> GeneratorResult<TokenStream> {
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let crate_name = get_crate_name(subscription_args.internal);
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let (self_ty, self_name) = 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 = &generics.where_clause;
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let gql_typename = subscription_args
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.name
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.clone()
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.unwrap_or_else(|| RenameTarget::Type.rename(self_name.clone()));
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let desc = if subscription_args.use_type_description {
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quote! { ::std::option::Option::Some(<Self as #crate_name::Description>::description()) }
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} else {
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get_rustdoc(&item_impl.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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};
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let mut create_stream = Vec::new();
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let mut schema_fields = Vec::new();
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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 field: SubscriptionField = parse_graphql_attrs(&method.attrs)?.unwrap_or_default();
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if field.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 ident = &method.sig.ident;
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let field_name = field.name.clone().unwrap_or_else(|| {
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subscription_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 = field
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.deprecation
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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 cfg_attrs = get_cfg_attrs(&method.attrs);
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if method.sig.asyncness.is_none() {
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return Err(Error::new_spanned(
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&method,
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"The subscription stream function must be asynchronous",
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)
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.into());
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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(&method.sig.output, "Missing type").into())
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}
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};
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let mut create_ctx = true;
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let mut args = Vec::new();
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for (idx, arg) in method.sig.inputs.iter_mut().enumerate() {
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if let FnArg::Receiver(receiver) = arg {
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if idx != 0 {
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return Err(Error::new_spanned(
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receiver,
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"The self receiver must be the first parameter.",
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)
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.into());
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}
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} else if let FnArg::Typed(pat) = arg {
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if idx == 0 {
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return Err(Error::new_spanned(
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pat,
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"The self receiver must be the first parameter.",
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)
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.into());
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}
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match (&*pat.pat, &*pat.ty) {
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(Pat::Ident(arg_ident), Type::Path(arg_ty)) => {
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args.push((
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arg_ident.clone(),
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arg_ty.clone(),
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parse_graphql_attrs::<args::SubscriptionFieldArgument>(&pat.attrs)?
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.unwrap_or_default(),
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));
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remove_graphql_attrs(&mut pat.attrs);
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}
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(arg, Type::Reference(TypeReference { elem, .. })) => {
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if let Type::Path(path) = elem.as_ref() {
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if idx != 1 || path.path.segments.last().unwrap().ident != "Context"
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{
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return Err(Error::new_spanned(
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arg,
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"Only types that implement `InputType` can be used as input arguments.",
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)
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.into());
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} else {
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create_ctx = false;
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}
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}
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}
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_ => {
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return Err(Error::new_spanned(arg, "Incorrect argument type").into());
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}
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}
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} else {
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return Err(Error::new_spanned(arg, "Incorrect argument type").into());
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}
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}
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if create_ctx {
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let arg = syn::parse2::<FnArg>(quote! { _: &#crate_name::Context<'_> }).unwrap();
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method.sig.inputs.insert(1, arg);
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}
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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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for (
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ident,
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ty,
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args::SubscriptionFieldArgument {
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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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},
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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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subscription_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 validator = match &validator {
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Some(meta) => {
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let stream = generate_validator(&crate_name, meta)?;
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quote!(::std::option::Option::Some(#stream))
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}
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None => quote!(::std::option::Option::None),
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};
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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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schema_args.push(quote! {
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args.insert(#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::Type>::create_type_info(registry),
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default_value: #schema_default,
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validator: #validator,
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});
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});
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use_params.push(quote! { #ident });
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let default = match default {
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Some(default) => quote! { ::std::option::Option::Some(|| -> #ty { #default }) },
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None => quote! { ::std::option::Option::None },
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};
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let param_getter_name = get_param_getter_ident(&ident.ident.to_string());
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get_params.push(quote! {
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#[allow(non_snake_case)]
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let #param_getter_name = || -> #crate_name::ServerResult<#ty> { ctx.param_value(#name, #default) };
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#[allow(non_snake_case)]
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let #ident: #ty = ctx.param_value(#name, #default)?;
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});
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}
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let res_ty = ty.value_type();
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let stream_ty = if let Type::ImplTrait(TypeImplTrait { bounds, .. }) = &res_ty {
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let mut r = None;
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for b in bounds {
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if let TypeParamBound::Trait(b) = b {
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r = Some(quote! { #b });
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}
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}
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quote! { #r }
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} else {
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quote! { #res_ty }
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};
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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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let value = (move || { async move #block })().await;
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::std::result::Result::Ok(value)
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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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schema_fields.push(quote! {
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#(#cfg_attrs)*
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fields.insert(::std::borrow::ToOwned::to_owned(#field_name), #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: <<#stream_ty as #crate_name::futures_util::stream::Stream>::Item as #crate_name::Type>::create_type_info(registry),
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deprecation: #field_deprecation,
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cache_control: ::std::default::Default::default(),
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external: false,
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requires: ::std::option::Option::None,
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provides: ::std::option::Option::None,
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});
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});
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let create_field_stream = quote! {
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self.#ident(ctx, #(#use_params),*)
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.await
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.map_err(|err| {
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err.into_server_error().at(ctx.item.pos)
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})?
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};
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let guard = match &field.guard {
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Some(meta_list) => generate_guards(&crate_name, meta_list)?,
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None => None,
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};
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let guard = guard.map(|guard| quote! {
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#guard.check(ctx).await.map_err(|err| err.into_server_error().at(ctx.item.pos))?;
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});
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let stream_fn = quote! {
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#(#get_params)*
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#guard
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let field_name = ::std::sync::Arc::new(::std::clone::Clone::clone(&ctx.item.node.response_key().node));
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let field = ::std::sync::Arc::new(::std::clone::Clone::clone(&ctx.item));
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let pos = ctx.item.pos;
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let schema_env = ::std::clone::Clone::clone(&ctx.schema_env);
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let query_env = ::std::clone::Clone::clone(&ctx.query_env);
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let stream = #crate_name::futures_util::stream::StreamExt::then(#create_field_stream, {
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let field_name = ::std::clone::Clone::clone(&field_name);
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move |msg| {
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let schema_env = ::std::clone::Clone::clone(&schema_env);
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let query_env = ::std::clone::Clone::clone(&query_env);
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let field = ::std::clone::Clone::clone(&field);
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let field_name = ::std::clone::Clone::clone(&field_name);
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async move {
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let resolve_id = #crate_name::ResolveId {
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parent: ::std::option::Option::Some(0),
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current: 1,
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};
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let inc_resolve_id = ::std::sync::atomic::AtomicUsize::new(1);
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let ctx_selection_set = query_env.create_context(
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&schema_env,
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::std::option::Option::Some(#crate_name::QueryPathNode {
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parent: ::std::option::Option::None,
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segment: #crate_name::QueryPathSegment::Name(&field_name),
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}),
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&field.node.selection_set,
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resolve_id,
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&inc_resolve_id,
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);
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let ctx_extension = #crate_name::extensions::ExtensionContext {
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schema_data: &schema_env.data,
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query_data: &query_env.ctx_data,
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};
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query_env.extensions.execution_start(&ctx_extension);
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#[allow(bare_trait_objects)]
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let ri = #crate_name::extensions::ResolveInfo {
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resolve_id,
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path_node: ctx_selection_set.path_node.as_ref().unwrap(),
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parent_type: #gql_typename,
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return_type: &<<#stream_ty as #crate_name::futures_util::stream::Stream>::Item as #crate_name::Type>::qualified_type_name(),
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};
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query_env.extensions.resolve_start(&ctx_extension, &ri);
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let res = #crate_name::OutputType::resolve(&msg, &ctx_selection_set, &*field).await;
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query_env.extensions.resolve_end(&ctx_extension, &ri);
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query_env.extensions.execution_end(&ctx_extension);
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res
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}
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}
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});
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#crate_name::ServerResult::Ok(#crate_name::futures_util::stream::StreamExt::scan(
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stream,
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false,
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|errored, item| {
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if *errored {
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return #crate_name::futures_util::future::ready(::std::option::Option::None);
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}
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if item.is_err() {
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*errored = true;
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}
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#crate_name::futures_util::future::ready(::std::option::Option::Some(item))
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},
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))
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};
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create_stream.push(quote! {
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#(#cfg_attrs)*
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if ctx.item.node.name.node == #field_name {
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return ::std::option::Option::Some(::std::boxed::Box::pin(
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#crate_name::futures_util::stream::TryStreamExt::try_flatten(
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#crate_name::futures_util::stream::once((move || async move { #stream_fn })())
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)
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));
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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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if create_stream.is_empty() {
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return Err(Error::new_spanned(
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&self_ty,
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"A GraphQL Object type must define one or more fields.",
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)
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.into());
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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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impl #generics #crate_name::Type for #self_ty #where_clause {
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fn type_name() -> ::std::borrow::Cow<'static, ::std::primitive::str> {
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::std::borrow::Cow::Borrowed(#gql_typename)
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}
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#[allow(bare_trait_objects)]
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fn create_type_info(registry: &mut #crate_name::registry::Registry) -> ::std::string::String {
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registry.create_type::<Self, _>(|registry| #crate_name::registry::MetaType::Object {
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name: ::std::borrow::ToOwned::to_owned(#gql_typename),
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description: #desc,
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fields: {
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let mut fields = #crate_name::indexmap::IndexMap::new();
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#(#schema_fields)*
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fields
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},
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cache_control: ::std::default::Default::default(),
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extends: false,
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keys: ::std::option::Option::None,
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})
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}
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}
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#[allow(clippy::all, clippy::pedantic)]
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#[allow(unused_braces, unused_variables)]
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impl #crate_name::SubscriptionType for #self_ty #where_clause {
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fn create_field_stream<'__life>(
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&'__life self,
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ctx: &'__life #crate_name::Context<'__life>,
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) -> ::std::option::Option<::std::pin::Pin<::std::boxed::Box<dyn #crate_name::futures_util::stream::Stream<Item = #crate_name::ServerResult<#crate_name::Value>> + ::std::marker::Send + '__life>>> {
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#(#create_stream)*
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::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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