6e628031bf
The main change in this commit is changing the return type of SubscriptionType::create_stream from Future<Result<Stream<Result<Response>>>> to just Stream<Result<Json>>. I also allowed the returned stream to borrow from self and context.
372 lines
16 KiB
Rust
372 lines
16 KiB
Rust
use crate::args;
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use crate::output_type::OutputType;
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use crate::utils::{feature_block, get_crate_name, get_param_getter_ident, get_rustdoc};
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use inflector::Inflector;
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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, Result, ReturnType, Type, TypeImplTrait,
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TypeReference,
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};
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pub fn generate(object_args: &args::Object, item_impl: &mut ItemImpl) -> Result<TokenStream> {
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let crate_name = get_crate_name(object_args.internal);
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let (self_ty, self_name) = match item_impl.self_ty.as_ref() {
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Type::Path(path) => (
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path,
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path.path
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.segments
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.last()
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.map(|s| s.ident.to_string())
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.unwrap(),
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),
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_ => return Err(Error::new_spanned(&item_impl.self_ty, "Invalid type")),
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};
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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 = object_args
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.name
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.clone()
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.unwrap_or_else(|| self_name.clone());
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let desc = object_args
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.desc
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.clone()
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.or_else(|| get_rustdoc(&item_impl.attrs).ok().flatten())
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.map(|s| quote! { Some(#s) })
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.unwrap_or_else(|| quote! {None});
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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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if let Some(field) = args::Field::parse(&crate_name, &method.attrs)? {
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let ident = &method.sig.ident;
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let field_name = field
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.name
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.clone()
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.unwrap_or_else(|| method.sig.ident.unraw().to_string().to_camel_case());
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let field_desc = field
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.desc
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.as_ref()
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.map(|s| quote! {Some(#s)})
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.unwrap_or_else(|| quote! {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! {Some(#s)})
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.unwrap_or_else(|| quote! {None});
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let features = field.features;
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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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}
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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"))
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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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}
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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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}
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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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args::Argument::parse(&crate_name, &pat.attrs)?,
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));
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pat.attrs.clear();
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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
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|| 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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"The Context must be the second argument.",
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));
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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"));
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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"));
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}
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}
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if create_ctx {
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let arg =
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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::Argument {
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name,
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desc,
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default,
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validator,
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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
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.clone()
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.unwrap_or_else(|| ident.ident.unraw().to_string().to_camel_case());
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let desc = desc
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.as_ref()
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.map(|s| quote! {Some(#s)})
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.unwrap_or_else(|| quote! {None});
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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! {Some( <#ty as #crate_name::InputValueType>::to_value(&#value).to_string() )}
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})
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.unwrap_or_else(|| quote! {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! { Some(|| -> #ty { #default }) },
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None => quote! { 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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let #param_getter_name = || -> #crate_name::Result<#ty> { ctx.param_value(#name, #default) };
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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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quote! { #bounds }
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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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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 = syn::parse2::<ReturnType>(
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quote! { -> #crate_name::FieldResult<#inner_ty> },
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)
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.expect("invalid result type");
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}
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method.block =
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syn::parse2::<Block>(feature_block(&crate_name, &features, &field_name, {
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let block = &method.block;
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quote! { #block }
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}))
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.expect("invalid block");
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schema_fields.push(quote! {
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fields.insert(#field_name.to_string(), #crate_name::registry::MetaField {
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name: #field_name.to_string(),
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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::stream::Stream>::Item as #crate_name::Type>::create_type_info(registry),
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deprecation: #field_deprecation,
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cache_control: Default::default(),
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external: false,
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requires: None,
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provides: 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_error_with_path(ctx.item.pos, ctx.path_node.as_ref())
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})?
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};
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let guard = field.guard.map(|guard| quote! {
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#guard.check(ctx).await.map_err(|err| err.into_error_with_path(ctx.item.pos, ctx.path_node.as_ref()))?;
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});
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if field.post_guard.is_some() {
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return Err(Error::new_spanned(
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method,
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"The subscription field does not support post guard",
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));
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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(ctx.item.node.response_key().node.clone());
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let field = ::std::sync::Arc::new(ctx.item.clone());
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let pos = ctx.item.pos;
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let schema_env = ctx.schema_env.clone();
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let query_env = ctx.query_env.clone();
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let stream = #crate_name::futures::StreamExt::then(#create_field_stream, {
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let field_name = field_name.clone();
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move |msg| {
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let schema_env = schema_env.clone();
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let query_env = query_env.clone();
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let field = field.clone();
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let field_name = field_name.clone();
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async move {
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let resolve_id = ::std::sync::atomic::AtomicUsize::default();
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let ctx_selection_set = query_env.create_context(
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&schema_env,
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Some(#crate_name::QueryPathNode {
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parent: 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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);
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#crate_name::OutputValueType::resolve(&msg, &ctx_selection_set, &*field)
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.await
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.map(|value| {
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#crate_name::serde_json::json!({
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field_name.as_str(): value
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})
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})
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}
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}
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});
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#crate_name::Result::Ok(#crate_name::futures::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::future::ready(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::future::ready(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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if ctx.item.node.name.node == #field_name {
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return ::std::boxed::Box::pin(
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#crate_name::futures::TryStreamExt::try_flatten(
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#crate_name::futures::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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}
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if let Some((idx, _)) = method
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.attrs
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.iter()
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.enumerate()
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.find(|(_, a)| a.path.is_ident("field"))
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{
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method.attrs.remove(idx);
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}
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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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impl #generics #crate_name::Type for #self_ty #where_clause {
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fn type_name() -> ::std::borrow::Cow<'static, 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) -> String {
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registry.create_type::<Self, _>(|registry| #crate_name::registry::MetaType::Object {
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name: #gql_typename.to_string(),
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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: 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<'a>(
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&'a self,
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ctx: &'a #crate_name::Context<'a>,
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) -> ::std::pin::Pin<::std::boxed::Box<dyn #crate_name::futures::Stream<Item = #crate_name::Result<#crate_name::serde_json::Value>> + Send + 'a>> {
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#(#create_stream)*
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let error = #crate_name::QueryError::FieldNotFound {
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field_name: ctx.item.node.name.to_string(),
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object: #gql_typename.to_string(),
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}
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.into_error(ctx.item.pos);
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::std::boxed::Box::pin(#crate_name::futures::stream::once(async { Err(error) }))
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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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