2020-03-17 09:26:59 +00:00
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use proc_macro::TokenStream;
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use quote::quote;
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2020-07-02 02:24:54 +00:00
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use syn::ext::IdentExt;
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2020-04-23 02:26:16 +00:00
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use syn::{
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2020-10-12 07:04:46 +00:00
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Block, Error, FnArg, ImplItem, ItemImpl, Pat, ReturnType, Type, TypeImplTrait, TypeParamBound,
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TypeReference,
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2020-04-23 02:26:16 +00:00
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};
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2020-03-17 09:26:59 +00:00
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2020-10-16 02:45:27 +00:00
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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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2020-11-22 01:53:18 +00:00
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get_param_getter_ident, get_rustdoc, get_type_path_and_name, parse_graphql_attrs,
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2020-12-11 08:03:28 +00:00
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remove_graphql_attrs, visible_fn, GeneratorResult,
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2020-10-16 02:45:27 +00:00
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};
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2020-09-28 09:44:00 +00:00
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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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2020-11-22 01:53:18 +00:00
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let (self_ty, self_name) = get_type_path_and_name(item_impl.self_ty.as_ref())?;
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2020-03-17 09:26:59 +00:00
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let generics = &item_impl.generics;
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2020-04-28 10:05:06 +00:00
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let where_clause = &generics.where_clause;
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2020-03-17 09:26:59 +00:00
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2020-09-28 09:44:00 +00:00
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let gql_typename = subscription_args
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2020-03-17 09:26:59 +00:00
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.name
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.clone()
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2020-10-14 09:08:57 +00:00
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.unwrap_or_else(|| RenameTarget::Type.rename(self_name.clone()));
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2020-03-19 09:20:12 +00:00
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2020-10-26 13:34:05 +00:00
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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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2020-03-17 09:26:59 +00:00
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2020-04-06 05:49:39 +00:00
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let mut create_stream = Vec::new();
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2020-03-17 09:26:59 +00:00
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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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2020-09-28 09:44:00 +00:00
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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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2020-03-17 09:26:59 +00:00
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2020-09-28 09:44:00 +00:00
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let ident = &method.sig.ident;
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2020-10-14 09:08:57 +00:00
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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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2020-09-28 09:44:00 +00:00
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let field_desc = get_rustdoc(&method.attrs)?
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2020-10-16 10:37:59 +00:00
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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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2020-09-28 09:44:00 +00:00
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let field_deprecation = field
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.deprecation
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.as_ref()
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2020-10-16 10:37:59 +00:00
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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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2020-09-28 09:44:00 +00:00
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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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2020-03-17 09:26:59 +00:00
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2020-09-28 09:44:00 +00:00
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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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2020-03-17 09:26:59 +00:00
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}
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2020-09-28 09:44:00 +00:00
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};
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2020-03-17 09:26:59 +00:00
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2020-09-28 09:44:00 +00:00
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let mut create_ctx = true;
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let mut args = Vec::new();
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2020-04-23 03:26:36 +00:00
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2020-09-28 09:44:00 +00:00
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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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2020-04-23 03:26:36 +00:00
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}
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2020-03-17 09:26:59 +00:00
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2020-09-28 09:44:00 +00:00
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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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2020-04-23 02:26:16 +00:00
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));
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2020-11-07 01:13:53 +00:00
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remove_graphql_attrs(&mut pat.attrs);
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2020-04-23 02:26:16 +00:00
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}
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2020-09-28 09:44:00 +00:00
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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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2020-12-11 07:37:50 +00:00
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"Only types that implement `InputType` can be used as input arguments.",
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2020-09-28 09:44:00 +00:00
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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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2020-04-23 02:26:16 +00:00
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}
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}
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2020-03-17 09:26:59 +00:00
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}
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2020-09-28 09:44:00 +00:00
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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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2020-03-17 09:26:59 +00:00
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}
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2020-09-28 09:44:00 +00:00
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} else {
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return Err(Error::new_spanned(arg, "Incorrect argument type").into());
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2020-03-17 09:26:59 +00:00
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}
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2020-09-28 09:44:00 +00:00
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}
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2020-03-17 09:26:59 +00:00
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2020-09-28 09:44:00 +00:00
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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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2020-03-17 09:26:59 +00:00
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2020-09-28 09:44:00 +00:00
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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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2020-03-17 09:26:59 +00:00
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2020-09-28 09:44:00 +00:00
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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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2020-12-11 08:03:28 +00:00
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visible: arg_visible,
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2020-09-28 09:44:00 +00:00
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},
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) in args
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{
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2020-10-14 09:08:57 +00:00
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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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2020-09-28 09:44:00 +00:00
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let desc = desc
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.as_ref()
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2020-10-16 10:37:59 +00:00
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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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2020-09-28 09:44:00 +00:00
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let default = generate_default(&default, &default_with)?;
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2020-03-17 09:26:59 +00:00
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2020-09-28 09:44:00 +00:00
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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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2020-10-16 10:37:59 +00:00
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quote!(::std::option::Option::Some(#stream))
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2020-09-28 09:44:00 +00:00
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}
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2020-10-16 10:37:59 +00:00
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None => quote!(::std::option::Option::None),
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2020-04-06 05:49:39 +00:00
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};
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2020-09-28 09:44:00 +00:00
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let schema_default = default
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.as_ref()
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.map(|value| {
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2020-10-16 19:21:46 +00:00
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quote! {
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::std::option::Option::Some(::std::string::ToString::to_string(
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2020-12-11 07:37:50 +00:00
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&<#ty as #crate_name::InputType>::to_value(&#value)
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2020-10-16 19:21:46 +00:00
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))
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}
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2020-09-28 09:44:00 +00:00
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})
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2020-10-16 10:37:59 +00:00
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.unwrap_or_else(|| quote! {::std::option::Option::None});
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2020-05-01 23:57:34 +00:00
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2020-12-11 08:03:28 +00:00
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let visible = visible_fn(&arg_visible);
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2020-09-28 09:44:00 +00:00
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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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2020-12-11 08:03:28 +00:00
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visible: #visible,
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2020-03-17 09:26:59 +00:00
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});
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});
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2020-09-28 09:44:00 +00:00
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use_params.push(quote! { #ident });
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let default = match default {
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2020-10-16 10:37:59 +00:00
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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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2020-04-23 02:26:16 +00:00
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};
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2020-09-28 09:44:00 +00:00
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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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2020-10-14 09:08:57 +00:00
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#[allow(non_snake_case)]
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2020-09-30 18:40:17 +00:00
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let #param_getter_name = || -> #crate_name::ServerResult<#ty> { ctx.param_value(#name, #default) };
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2020-10-14 09:08:57 +00:00
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#[allow(non_snake_case)]
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2020-09-28 09:44:00 +00:00
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let #ident: #ty = ctx.param_value(#name, #default)?;
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});
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}
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2020-04-23 02:26:16 +00:00
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2020-09-28 09:44:00 +00:00
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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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2020-10-12 07:04:46 +00:00
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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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2020-09-28 09:44:00 +00:00
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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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2020-10-16 10:37:59 +00:00
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::std::result::Result::Ok(value)
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2020-09-28 09:44:00 +00:00
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}
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2020-05-05 05:02:24 +00:00
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});
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2020-09-28 09:44:00 +00:00
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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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2020-09-30 18:40:17 +00:00
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syn::parse2::<ReturnType>(quote! { -> #crate_name::Result<#inner_ty> })
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2020-09-28 09:44:00 +00:00
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.expect("invalid result type");
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}
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2020-04-23 02:26:16 +00:00
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2020-12-11 08:03:28 +00:00
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let visible = visible_fn(&field.visible);
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2020-09-28 09:44:00 +00:00
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schema_fields.push(quote! {
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#(#cfg_attrs)*
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2020-10-16 19:21:46 +00:00
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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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2020-09-28 09:44:00 +00:00
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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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2020-10-16 06:49:22 +00:00
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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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2020-09-28 09:44:00 +00:00
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deprecation: #field_deprecation,
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2020-10-16 10:37:59 +00:00
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cache_control: ::std::default::Default::default(),
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2020-09-28 09:44:00 +00:00
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external: false,
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2020-10-16 10:37:59 +00:00
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requires: ::std::option::Option::None,
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provides: ::std::option::Option::None,
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2020-12-11 08:03:28 +00:00
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visible: #visible,
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2020-05-05 05:02:24 +00:00
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});
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2020-09-28 09:44:00 +00:00
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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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2020-09-30 18:40:17 +00:00
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err.into_server_error().at(ctx.item.pos)
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2020-09-28 09:44:00 +00:00
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})?
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};
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2020-04-23 03:26:36 +00:00
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2020-09-28 09:44:00 +00:00
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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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2020-09-30 18:40:17 +00:00
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#guard.check(ctx).await.map_err(|err| err.into_server_error().at(ctx.item.pos))?;
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2020-09-28 09:44:00 +00:00
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});
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2020-05-12 08:27:06 +00:00
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2020-09-28 09:44:00 +00:00
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|
let stream_fn = quote! {
|
|
|
|
#(#get_params)*
|
|
|
|
#guard
|
2020-10-16 19:21:46 +00:00
|
|
|
let field_name = ::std::sync::Arc::new(::std::clone::Clone::clone(&ctx.item.node.response_key().node));
|
|
|
|
let field = ::std::sync::Arc::new(::std::clone::Clone::clone(&ctx.item));
|
2020-09-28 09:44:00 +00:00
|
|
|
|
|
|
|
let pos = ctx.item.pos;
|
2020-10-16 19:21:46 +00:00
|
|
|
let schema_env = ::std::clone::Clone::clone(&ctx.schema_env);
|
|
|
|
let query_env = ::std::clone::Clone::clone(&ctx.query_env);
|
2020-10-16 06:49:22 +00:00
|
|
|
let stream = #crate_name::futures_util::stream::StreamExt::then(#create_field_stream, {
|
2020-10-16 19:21:46 +00:00
|
|
|
let field_name = ::std::clone::Clone::clone(&field_name);
|
2020-09-28 09:44:00 +00:00
|
|
|
move |msg| {
|
2020-10-16 19:21:46 +00:00
|
|
|
let schema_env = ::std::clone::Clone::clone(&schema_env);
|
|
|
|
let query_env = ::std::clone::Clone::clone(&query_env);
|
|
|
|
let field = ::std::clone::Clone::clone(&field);
|
|
|
|
let field_name = ::std::clone::Clone::clone(&field_name);
|
2020-09-28 09:44:00 +00:00
|
|
|
async move {
|
|
|
|
let resolve_id = #crate_name::ResolveId {
|
2020-10-16 10:37:59 +00:00
|
|
|
parent: ::std::option::Option::Some(0),
|
2020-09-28 09:44:00 +00:00
|
|
|
current: 1,
|
|
|
|
};
|
|
|
|
let inc_resolve_id = ::std::sync::atomic::AtomicUsize::new(1);
|
|
|
|
let ctx_selection_set = query_env.create_context(
|
|
|
|
&schema_env,
|
2020-10-16 10:37:59 +00:00
|
|
|
::std::option::Option::Some(#crate_name::QueryPathNode {
|
|
|
|
parent: ::std::option::Option::None,
|
2020-09-28 09:44:00 +00:00
|
|
|
segment: #crate_name::QueryPathSegment::Name(&field_name),
|
|
|
|
}),
|
|
|
|
&field.node.selection_set,
|
|
|
|
resolve_id,
|
|
|
|
&inc_resolve_id,
|
|
|
|
);
|
2020-09-29 12:47:37 +00:00
|
|
|
let ctx_extension = #crate_name::extensions::ExtensionContext {
|
|
|
|
schema_data: &schema_env.data,
|
|
|
|
query_data: &query_env.ctx_data,
|
|
|
|
};
|
2020-09-13 17:52:36 +00:00
|
|
|
|
2020-10-12 06:49:32 +00:00
|
|
|
query_env.extensions.execution_start(&ctx_extension);
|
2020-09-28 09:44:00 +00:00
|
|
|
|
|
|
|
#[allow(bare_trait_objects)]
|
|
|
|
let ri = #crate_name::extensions::ResolveInfo {
|
|
|
|
resolve_id,
|
|
|
|
path_node: ctx_selection_set.path_node.as_ref().unwrap(),
|
|
|
|
parent_type: #gql_typename,
|
2020-10-16 06:49:22 +00:00
|
|
|
return_type: &<<#stream_ty as #crate_name::futures_util::stream::Stream>::Item as #crate_name::Type>::qualified_type_name(),
|
2020-09-28 09:44:00 +00:00
|
|
|
};
|
|
|
|
|
2020-10-12 06:49:32 +00:00
|
|
|
query_env.extensions.resolve_start(&ctx_extension, &ri);
|
2020-09-28 09:44:00 +00:00
|
|
|
|
2020-12-11 07:37:50 +00:00
|
|
|
let res = #crate_name::OutputType::resolve(&msg, &ctx_selection_set, &*field).await;
|
2020-09-28 09:44:00 +00:00
|
|
|
|
2020-10-12 06:49:32 +00:00
|
|
|
query_env.extensions.resolve_end(&ctx_extension, &ri);
|
|
|
|
query_env.extensions.execution_end(&ctx_extension);
|
2020-09-30 18:40:17 +00:00
|
|
|
|
|
|
|
res
|
2020-09-13 17:52:36 +00:00
|
|
|
}
|
2020-03-17 09:26:59 +00:00
|
|
|
}
|
|
|
|
});
|
2020-10-16 06:49:22 +00:00
|
|
|
#crate_name::ServerResult::Ok(#crate_name::futures_util::stream::StreamExt::scan(
|
2020-09-28 09:44:00 +00:00
|
|
|
stream,
|
|
|
|
false,
|
|
|
|
|errored, item| {
|
|
|
|
if *errored {
|
2020-10-16 10:37:59 +00:00
|
|
|
return #crate_name::futures_util::future::ready(::std::option::Option::None);
|
2020-09-28 09:44:00 +00:00
|
|
|
}
|
|
|
|
if item.is_err() {
|
|
|
|
*errored = true;
|
|
|
|
}
|
2020-10-16 10:37:59 +00:00
|
|
|
#crate_name::futures_util::future::ready(::std::option::Option::Some(item))
|
2020-09-28 09:44:00 +00:00
|
|
|
},
|
|
|
|
))
|
|
|
|
};
|
2020-03-17 09:26:59 +00:00
|
|
|
|
2020-09-28 09:44:00 +00:00
|
|
|
create_stream.push(quote! {
|
|
|
|
#(#cfg_attrs)*
|
|
|
|
if ctx.item.node.name.node == #field_name {
|
2020-09-30 17:24:24 +00:00
|
|
|
return ::std::option::Option::Some(::std::boxed::Box::pin(
|
2020-10-16 06:49:22 +00:00
|
|
|
#crate_name::futures_util::stream::TryStreamExt::try_flatten(
|
|
|
|
#crate_name::futures_util::stream::once((move || async move { #stream_fn })())
|
2020-09-28 09:44:00 +00:00
|
|
|
)
|
2020-09-30 17:24:24 +00:00
|
|
|
));
|
2020-09-28 09:44:00 +00:00
|
|
|
}
|
|
|
|
});
|
2020-03-17 09:26:59 +00:00
|
|
|
|
2020-09-28 09:44:00 +00:00
|
|
|
remove_graphql_attrs(&mut method.attrs);
|
2020-03-17 09:26:59 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-10-20 03:49:31 +00:00
|
|
|
if create_stream.is_empty() {
|
|
|
|
return Err(Error::new_spanned(
|
|
|
|
&self_ty,
|
2020-10-22 02:11:47 +00:00
|
|
|
"A GraphQL Object type must define one or more fields.",
|
2020-10-20 03:49:31 +00:00
|
|
|
)
|
|
|
|
.into());
|
|
|
|
}
|
|
|
|
|
2020-03-17 09:26:59 +00:00
|
|
|
let expanded = quote! {
|
|
|
|
#item_impl
|
|
|
|
|
2020-06-28 06:28:53 +00:00
|
|
|
#[allow(clippy::all, clippy::pedantic)]
|
2020-04-28 10:05:06 +00:00
|
|
|
impl #generics #crate_name::Type for #self_ty #where_clause {
|
2020-10-16 10:37:59 +00:00
|
|
|
fn type_name() -> ::std::borrow::Cow<'static, ::std::primitive::str> {
|
2020-06-24 06:04:48 +00:00
|
|
|
::std::borrow::Cow::Borrowed(#gql_typename)
|
2020-03-17 09:26:59 +00:00
|
|
|
}
|
|
|
|
|
2020-04-06 05:49:39 +00:00
|
|
|
#[allow(bare_trait_objects)]
|
2020-10-16 10:37:59 +00:00
|
|
|
fn create_type_info(registry: &mut #crate_name::registry::Registry) -> ::std::string::String {
|
2020-05-15 02:08:37 +00:00
|
|
|
registry.create_type::<Self, _>(|registry| #crate_name::registry::MetaType::Object {
|
2020-10-16 19:21:46 +00:00
|
|
|
name: ::std::borrow::ToOwned::to_owned(#gql_typename),
|
2020-03-17 09:26:59 +00:00
|
|
|
description: #desc,
|
|
|
|
fields: {
|
2020-05-16 02:05:48 +00:00
|
|
|
let mut fields = #crate_name::indexmap::IndexMap::new();
|
2020-03-17 09:26:59 +00:00
|
|
|
#(#schema_fields)*
|
|
|
|
fields
|
|
|
|
},
|
2020-09-13 17:52:36 +00:00
|
|
|
cache_control: ::std::default::Default::default(),
|
2020-04-09 14:03:09 +00:00
|
|
|
extends: false,
|
2020-10-16 10:37:59 +00:00
|
|
|
keys: ::std::option::Option::None,
|
2020-12-11 08:03:28 +00:00
|
|
|
visible: ::std::option::Option::None,
|
2020-03-17 09:26:59 +00:00
|
|
|
})
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-06-28 06:28:53 +00:00
|
|
|
#[allow(clippy::all, clippy::pedantic)]
|
2020-07-03 01:41:26 +00:00
|
|
|
#[allow(unused_braces, unused_variables)]
|
2020-04-28 10:05:06 +00:00
|
|
|
impl #crate_name::SubscriptionType for #self_ty #where_clause {
|
2020-10-14 22:27:31 +00:00
|
|
|
fn create_field_stream<'__life>(
|
|
|
|
&'__life self,
|
|
|
|
ctx: &'__life #crate_name::Context<'__life>,
|
2020-10-16 10:37:59 +00:00
|
|
|
) -> ::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>>> {
|
2020-04-06 05:49:39 +00:00
|
|
|
#(#create_stream)*
|
2020-10-16 10:37:59 +00:00
|
|
|
::std::option::Option::None
|
2020-03-17 09:26:59 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
};
|
|
|
|
Ok(expanded.into())
|
|
|
|
}
|