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Attempt first naive version of async union #552

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Attempt first naive version of async union #552

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34 changes: 29 additions & 5 deletions juniper_codegen/src/impl_union.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@ use proc_macro::TokenStream;

use proc_macro_error::MacroError;
use quote::quote;
use syn::parse_quote;
use syn::spanned::Spanned;

use crate::util;
Expand Down Expand Up @@ -151,9 +152,15 @@ pub fn impl_union(
.unwrap_or_else(|| quote! { () });

let ty = _impl.target_type;

let output = quote! {
impl #impl_generics #crate_name::GraphQLType<#scalar> for #ty #where_clause
let mut where_async = where_clause.cloned().unwrap_or_else(|| parse_quote!(where));
where_async
.predicates
.push(parse_quote!( #scalar: Send + Sync ));
where_async.predicates.push(parse_quote!(Self: Send + Sync));

let output = quote!(
impl #impl_generics #crate_name::GraphQLType<#scalar> for #ty
#where_clause
{
type Context = #context;
type TypeInfo = ();
Expand Down Expand Up @@ -198,11 +205,28 @@ pub fn impl_union(

#( #resolve_into_type )*

panic!("Concrete type not handled by instance resolvers on {}", #name);
panic!("Concrete type not handled by instance resolvers on {}", #name);
}
}

impl #impl_generics #crate_name::GraphQLTypeAsync<#scalar> for #ty
#where_async
{
fn resolve_async<'a>(
&'a self,
info: &'a Self::TypeInfo,
selection_set: Option<&'a [#crate_name::Selection<#scalar>]>,
executor: &'a #crate_name::Executor<Self::Context, #scalar>,
) -> #crate_name::BoxFuture<'a, #crate_name::ExecutionResult<#scalar>>
where #scalar: Send + Sync,
{
use futures::future;
use #crate_name::GraphQLType;
let v = self.resolve(info, selection_set, executor);
futures::FutureExt::boxed(future::ready(v))
}
}
);

};
Ok(output.into())
}