409 lines
17 KiB
Rust
409 lines
17 KiB
Rust
use crate::args;
|
|
use crate::args::SubscriptionField;
|
|
use crate::output_type::OutputType;
|
|
use crate::utils::{
|
|
generate_default, generate_guards, generate_validator, get_cfg_attrs, get_crate_name,
|
|
get_param_getter_ident, get_rustdoc, parse_graphql_attrs, remove_graphql_attrs,
|
|
GeneratorResult,
|
|
};
|
|
use inflector::Inflector;
|
|
use proc_macro::TokenStream;
|
|
use quote::quote;
|
|
use syn::ext::IdentExt;
|
|
use syn::{
|
|
Block, Error, FnArg, ImplItem, ItemImpl, Pat, ReturnType, Type, TypeImplTrait, TypeReference,
|
|
};
|
|
|
|
pub fn generate(
|
|
subscription_args: &args::Subscription,
|
|
item_impl: &mut ItemImpl,
|
|
) -> GeneratorResult<TokenStream> {
|
|
let crate_name = get_crate_name(subscription_args.internal);
|
|
let (self_ty, self_name) = match item_impl.self_ty.as_ref() {
|
|
Type::Path(path) => (
|
|
path,
|
|
path.path
|
|
.segments
|
|
.last()
|
|
.map(|s| s.ident.to_string())
|
|
.unwrap(),
|
|
),
|
|
_ => return Err(Error::new_spanned(&item_impl.self_ty, "Invalid type").into()),
|
|
};
|
|
let generics = &item_impl.generics;
|
|
let where_clause = &generics.where_clause;
|
|
|
|
let gql_typename = subscription_args
|
|
.name
|
|
.clone()
|
|
.unwrap_or_else(|| self_name.clone());
|
|
|
|
let desc = get_rustdoc(&item_impl.attrs)?
|
|
.map(|s| quote! { Some(#s) })
|
|
.unwrap_or_else(|| quote! {None});
|
|
|
|
let mut create_stream = Vec::new();
|
|
let mut schema_fields = Vec::new();
|
|
|
|
for item in &mut item_impl.items {
|
|
if let ImplItem::Method(method) = item {
|
|
let field: SubscriptionField = parse_graphql_attrs(&method.attrs)?.unwrap_or_default();
|
|
if field.skip {
|
|
remove_graphql_attrs(&mut method.attrs);
|
|
continue;
|
|
}
|
|
|
|
let ident = &method.sig.ident;
|
|
let field_name = field
|
|
.name
|
|
.clone()
|
|
.unwrap_or_else(|| method.sig.ident.unraw().to_string().to_camel_case());
|
|
let field_desc = get_rustdoc(&method.attrs)?
|
|
.map(|s| quote! {Some(#s)})
|
|
.unwrap_or_else(|| quote! {None});
|
|
let field_deprecation = field
|
|
.deprecation
|
|
.as_ref()
|
|
.map(|s| quote! {Some(#s)})
|
|
.unwrap_or_else(|| quote! {None});
|
|
let cfg_attrs = get_cfg_attrs(&method.attrs);
|
|
|
|
if method.sig.asyncness.is_none() {
|
|
return Err(Error::new_spanned(
|
|
&method,
|
|
"The subscription stream function must be asynchronous",
|
|
)
|
|
.into());
|
|
}
|
|
|
|
let ty = match &method.sig.output {
|
|
ReturnType::Type(_, ty) => OutputType::parse(ty)?,
|
|
ReturnType::Default => {
|
|
return Err(Error::new_spanned(&method.sig.output, "Missing type").into())
|
|
}
|
|
};
|
|
|
|
let mut create_ctx = true;
|
|
let mut args = Vec::new();
|
|
|
|
for (idx, arg) in method.sig.inputs.iter_mut().enumerate() {
|
|
if let FnArg::Receiver(receiver) = arg {
|
|
if idx != 0 {
|
|
return Err(Error::new_spanned(
|
|
receiver,
|
|
"The self receiver must be the first parameter.",
|
|
)
|
|
.into());
|
|
}
|
|
} else if let FnArg::Typed(pat) = arg {
|
|
if idx == 0 {
|
|
return Err(Error::new_spanned(
|
|
pat,
|
|
"The self receiver must be the first parameter.",
|
|
)
|
|
.into());
|
|
}
|
|
|
|
match (&*pat.pat, &*pat.ty) {
|
|
(Pat::Ident(arg_ident), Type::Path(arg_ty)) => {
|
|
args.push((
|
|
arg_ident.clone(),
|
|
arg_ty.clone(),
|
|
parse_graphql_attrs::<args::SubscriptionFieldArgument>(&pat.attrs)?
|
|
.unwrap_or_default(),
|
|
));
|
|
pat.attrs.clear();
|
|
}
|
|
(arg, Type::Reference(TypeReference { elem, .. })) => {
|
|
if let Type::Path(path) = elem.as_ref() {
|
|
if idx != 1 || path.path.segments.last().unwrap().ident != "Context"
|
|
{
|
|
return Err(Error::new_spanned(
|
|
arg,
|
|
"The Context must be the second argument.",
|
|
)
|
|
.into());
|
|
} else {
|
|
create_ctx = false;
|
|
}
|
|
}
|
|
}
|
|
_ => {
|
|
return Err(Error::new_spanned(arg, "Incorrect argument type").into());
|
|
}
|
|
}
|
|
} else {
|
|
return Err(Error::new_spanned(arg, "Incorrect argument type").into());
|
|
}
|
|
}
|
|
|
|
if create_ctx {
|
|
let arg = syn::parse2::<FnArg>(quote! { _: &#crate_name::Context<'_> }).unwrap();
|
|
method.sig.inputs.insert(1, arg);
|
|
}
|
|
|
|
let mut schema_args = Vec::new();
|
|
let mut use_params = Vec::new();
|
|
let mut get_params = Vec::new();
|
|
|
|
for (
|
|
ident,
|
|
ty,
|
|
args::SubscriptionFieldArgument {
|
|
name,
|
|
desc,
|
|
default,
|
|
default_with,
|
|
validator,
|
|
},
|
|
) in args
|
|
{
|
|
let name = name
|
|
.clone()
|
|
.unwrap_or_else(|| ident.ident.unraw().to_string().to_camel_case());
|
|
let desc = desc
|
|
.as_ref()
|
|
.map(|s| quote! {Some(#s)})
|
|
.unwrap_or_else(|| quote! {None});
|
|
let default = generate_default(&default, &default_with)?;
|
|
|
|
let validator = match &validator {
|
|
Some(meta) => {
|
|
let stream = generate_validator(&crate_name, meta)?;
|
|
quote!(Some(#stream))
|
|
}
|
|
None => quote!(None),
|
|
};
|
|
|
|
let schema_default = default
|
|
.as_ref()
|
|
.map(|value| {
|
|
quote! {Some( <#ty as #crate_name::InputValueType>::to_value(&#value).to_string() )}
|
|
})
|
|
.unwrap_or_else(|| quote! {None});
|
|
|
|
schema_args.push(quote! {
|
|
args.insert(#name, #crate_name::registry::MetaInputValue {
|
|
name: #name,
|
|
description: #desc,
|
|
ty: <#ty as #crate_name::Type>::create_type_info(registry),
|
|
default_value: #schema_default,
|
|
validator: #validator,
|
|
});
|
|
});
|
|
|
|
use_params.push(quote! { #ident });
|
|
|
|
let default = match default {
|
|
Some(default) => quote! { Some(|| -> #ty { #default }) },
|
|
None => quote! { None },
|
|
};
|
|
let param_getter_name = get_param_getter_ident(&ident.ident.to_string());
|
|
get_params.push(quote! {
|
|
let #param_getter_name = || -> #crate_name::Result<#ty> { ctx.param_value(#name, #default) };
|
|
let #ident: #ty = ctx.param_value(#name, #default)?;
|
|
});
|
|
}
|
|
|
|
let res_ty = ty.value_type();
|
|
let stream_ty = if let Type::ImplTrait(TypeImplTrait { bounds, .. }) = &res_ty {
|
|
quote! { #bounds }
|
|
} else {
|
|
quote! { #res_ty }
|
|
};
|
|
|
|
if let OutputType::Value(inner_ty) = &ty {
|
|
let block = &method.block;
|
|
let new_block = quote!({
|
|
{
|
|
let value = (move || { async move #block })().await;
|
|
Ok(value)
|
|
}
|
|
});
|
|
method.block = syn::parse2::<Block>(new_block).expect("invalid block");
|
|
method.sig.output =
|
|
syn::parse2::<ReturnType>(quote! { -> #crate_name::FieldResult<#inner_ty> })
|
|
.expect("invalid result type");
|
|
}
|
|
|
|
schema_fields.push(quote! {
|
|
#(#cfg_attrs)*
|
|
fields.insert(#field_name.to_string(), #crate_name::registry::MetaField {
|
|
name: #field_name.to_string(),
|
|
description: #field_desc,
|
|
args: {
|
|
let mut args = #crate_name::indexmap::IndexMap::new();
|
|
#(#schema_args)*
|
|
args
|
|
},
|
|
ty: <<#stream_ty as #crate_name::futures::stream::Stream>::Item as #crate_name::Type>::create_type_info(registry),
|
|
deprecation: #field_deprecation,
|
|
cache_control: Default::default(),
|
|
external: false,
|
|
requires: None,
|
|
provides: None,
|
|
});
|
|
});
|
|
|
|
let create_field_stream = quote! {
|
|
self.#ident(ctx, #(#use_params),*)
|
|
.await
|
|
.map_err(|err| {
|
|
err.into_error_with_path(ctx.item.pos, ctx.path_node.as_ref())
|
|
})?
|
|
};
|
|
|
|
let guard = match &field.guard {
|
|
Some(meta_list) => generate_guards(&crate_name, meta_list)?,
|
|
None => None,
|
|
};
|
|
let guard = guard.map(|guard| quote! {
|
|
#guard.check(ctx).await.map_err(|err| err.into_error_with_path(ctx.item.pos, ctx.path_node.as_ref()))?;
|
|
});
|
|
if field.post_guard.is_some() {
|
|
return Err(Error::new_spanned(
|
|
method,
|
|
"The subscription field does not support post guard",
|
|
)
|
|
.into());
|
|
}
|
|
|
|
let stream_fn = quote! {
|
|
#(#get_params)*
|
|
#guard
|
|
let field_name = ::std::sync::Arc::new(ctx.item.node.response_key().node.clone());
|
|
let field = ::std::sync::Arc::new(ctx.item.clone());
|
|
|
|
let pos = ctx.item.pos;
|
|
let schema_env = ctx.schema_env.clone();
|
|
let query_env = ctx.query_env.clone();
|
|
let stream = #crate_name::futures::StreamExt::then(#create_field_stream, {
|
|
let field_name = field_name.clone();
|
|
move |msg| {
|
|
let schema_env = schema_env.clone();
|
|
let query_env = query_env.clone();
|
|
let field = field.clone();
|
|
let field_name = field_name.clone();
|
|
async move {
|
|
let resolve_id = #crate_name::ResolveId {
|
|
parent: Some(0),
|
|
current: 1,
|
|
};
|
|
let inc_resolve_id = ::std::sync::atomic::AtomicUsize::new(1);
|
|
let ctx_selection_set = query_env.create_context(
|
|
&schema_env,
|
|
Some(#crate_name::QueryPathNode {
|
|
parent: None,
|
|
segment: #crate_name::QueryPathSegment::Name(&field_name),
|
|
}),
|
|
&field.node.selection_set,
|
|
resolve_id,
|
|
&inc_resolve_id,
|
|
);
|
|
let ctx_extension = #crate_name::extensions::ExtensionContext {
|
|
schema_data: &schema_env.data,
|
|
query_data: &query_env.ctx_data,
|
|
};
|
|
|
|
#crate_name::extensions::Extension::execution_start(&mut *query_env.extensions.lock(), &ctx_extension);
|
|
|
|
#[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,
|
|
return_type: &<<#stream_ty as #crate_name::futures::stream::Stream>::Item as #crate_name::Type>::qualified_type_name(),
|
|
};
|
|
|
|
#crate_name::extensions::Extension::resolve_start(&mut *query_env.extensions.lock(), &ctx_extension, &ri);
|
|
|
|
let res = #crate_name::OutputValueType::resolve(&msg, &ctx_selection_set, &*field)
|
|
.await
|
|
.map(|value| {
|
|
#crate_name::serde_json::json!({
|
|
field_name.as_str(): value
|
|
})
|
|
});
|
|
|
|
#crate_name::extensions::Extension::resolve_end(&mut *query_env.extensions.lock(), &ctx_extension, &ri);
|
|
#crate_name::extensions::Extension::execution_end(&mut *query_env.extensions.lock(), &ctx_extension);
|
|
res
|
|
}
|
|
}
|
|
});
|
|
#crate_name::Result::Ok(#crate_name::futures::StreamExt::scan(
|
|
stream,
|
|
false,
|
|
|errored, item| {
|
|
if *errored {
|
|
return #crate_name::futures::future::ready(None);
|
|
}
|
|
if item.is_err() {
|
|
*errored = true;
|
|
}
|
|
#crate_name::futures::future::ready(Some(item))
|
|
},
|
|
))
|
|
};
|
|
|
|
create_stream.push(quote! {
|
|
#(#cfg_attrs)*
|
|
if ctx.item.node.name.node == #field_name {
|
|
return ::std::boxed::Box::pin(
|
|
#crate_name::futures::TryStreamExt::try_flatten(
|
|
#crate_name::futures::stream::once((move || async move { #stream_fn })())
|
|
)
|
|
);
|
|
}
|
|
});
|
|
|
|
remove_graphql_attrs(&mut method.attrs);
|
|
}
|
|
}
|
|
|
|
let expanded = quote! {
|
|
#item_impl
|
|
|
|
#[allow(clippy::all, clippy::pedantic)]
|
|
impl #generics #crate_name::Type for #self_ty #where_clause {
|
|
fn type_name() -> ::std::borrow::Cow<'static, str> {
|
|
::std::borrow::Cow::Borrowed(#gql_typename)
|
|
}
|
|
|
|
#[allow(bare_trait_objects)]
|
|
fn create_type_info(registry: &mut #crate_name::registry::Registry) -> String {
|
|
registry.create_type::<Self, _>(|registry| #crate_name::registry::MetaType::Object {
|
|
name: #gql_typename.to_string(),
|
|
description: #desc,
|
|
fields: {
|
|
let mut fields = #crate_name::indexmap::IndexMap::new();
|
|
#(#schema_fields)*
|
|
fields
|
|
},
|
|
cache_control: ::std::default::Default::default(),
|
|
extends: false,
|
|
keys: None,
|
|
})
|
|
}
|
|
}
|
|
|
|
#[allow(clippy::all, clippy::pedantic)]
|
|
#[allow(unused_braces, unused_variables)]
|
|
impl #crate_name::SubscriptionType for #self_ty #where_clause {
|
|
fn create_field_stream<'a>(
|
|
&'a self,
|
|
ctx: &'a #crate_name::Context<'a>,
|
|
) -> ::std::pin::Pin<::std::boxed::Box<dyn #crate_name::futures::Stream<Item = #crate_name::Result<#crate_name::serde_json::Value>> + Send + 'a>> {
|
|
#(#create_stream)*
|
|
let error = #crate_name::QueryError::FieldNotFound {
|
|
field_name: ctx.item.node.name.to_string(),
|
|
object: #gql_typename.to_string(),
|
|
}
|
|
.into_error(ctx.item.pos);
|
|
::std::boxed::Box::pin(#crate_name::futures::stream::once(async { Err(error) }))
|
|
}
|
|
}
|
|
};
|
|
Ok(expanded.into())
|
|
}
|