Merge pull request #438 from tyranron/remove-async-closure-feature

* Upgrade futures-preview, tokio crates and remove unnecessary 'async_await' feature

* Remove async_closure feature usage

* Fix type inferring for trivial resolver code

Additionally:
- fix inconsistencies after merge with master

examples/warp_async/src/main.rs

@@ -2,8 +2,6 @@
 //! This example demonstrates async/await usage with warp.
 //! NOTE: this uses tokio 0.1 , not the alpha tokio 0.2.
 
-#![feature(async_closure)]
-
 use juniper::{EmptyMutation, RootNode, FieldError};
 use warp::{http::Response, Filter};
 

integration_tests/async_await/src/main.rs

@@ -1,5 +1,3 @@
-#![feature(async_closure)]
-
 use juniper::{graphql_value, RootNode, Value};
 
 #[derive(juniper::GraphQLEnum)]

juniper/src/executor/mod.rs

@@ -828,121 +828,10 @@ where
         None => return Err(GraphQLError::UnknownOperationName),
     };
 
-    let default_variable_values = op.item.variable_definitions.map(|defs| {
+    if op.item.operation_type == OperationType::Subscription {
-        defs.item
+        return Err(GraphQLError::IsSubscription);
-            .items
-            .iter()
-            .filter_map(|&(ref name, ref def)| {
-                def.default_value
-                    .as_ref()
-                    .map(|i| (name.item.to_owned(), i.item.clone()))
-            })
-            .collect::<HashMap<String, InputValue<S>>>()
-    });
-
-    let errors = RwLock::new(Vec::new());
-    let value;
-
-    {
-        let mut all_vars;
-        let mut final_vars = variables;
-
-        if let Some(defaults) = default_variable_values {
-            all_vars = variables.clone();
-
-            for (name, value) in defaults {
-                all_vars.entry(name).or_insert(value);
     }
 
-            final_vars = &all_vars;
-        }
-
-        let root_type = match op.item.operation_type {
-            OperationType::Query => root_node.schema.query_type(),
-            OperationType::Mutation => root_node
-                .schema
-                .mutation_type()
-                .expect("No mutation type found"),
-        };
-
-        let executor = Executor {
-            fragments: &fragments
-                .iter()
-                .map(|f| (f.item.name.item, &f.item))
-                .collect(),
-            variables: final_vars,
-            current_selection_set: Some(&op.item.selection_set[..]),
-            parent_selection_set: None,
-            current_type: root_type,
-            schema: &root_node.schema,
-            context,
-            errors: &errors,
-            field_path: FieldPath::Root(op.start),
-        };
-
-        value = match op.item.operation_type {
-            OperationType::Query => {
-                executor
-                    .resolve_into_value_async(&root_node.query_info, &root_node)
-                    .await
-            }
-            OperationType::Mutation => {
-                executor
-                    .resolve_into_value_async(&root_node.mutation_info, &root_node.mutation_type)
-                    .await
-            }
-        };
-    }
-
-    let mut errors = errors.into_inner().unwrap();
-    errors.sort();
-
-    Ok((value, errors))
-}
-
-#[cfg(feature = "async")]
-pub async fn execute_validated_query_async<'a, QueryT, MutationT, CtxT, S>(
-    document: Document<'a, S>,
-    operation_name: Option<&str>,
-    root_node: &RootNode<'a, QueryT, MutationT, S>,
-    variables: &Variables<S>,
-    context: &CtxT,
-) -> Result<(Value<S>, Vec<ExecutionError<S>>), GraphQLError<'a>>
-where
-    S: ScalarValue + Send + Sync,
-    QueryT: crate::GraphQLTypeAsync<S, Context = CtxT> + Send + Sync,
-    QueryT::TypeInfo: Send + Sync,
-    MutationT: crate::GraphQLTypeAsync<S, Context = CtxT> + Send + Sync,
-    MutationT::TypeInfo: Send + Sync,
-    CtxT: Send + Sync,
-    for<'b> &'b S: ScalarRefValue<'b>,
-{
-    let mut fragments = vec![];
-    let mut operation = None;
-
-    for def in document {
-        match def {
-            Definition::Operation(op) => {
-                if operation_name.is_none() && operation.is_some() {
-                    return Err(GraphQLError::MultipleOperationsProvided);
-                }
-
-                let move_op = operation_name.is_none()
-                    || op.item.name.as_ref().map(|s| s.item) == operation_name;
-
-                if move_op {
-                    operation = Some(op);
-                }
-            }
-            Definition::Fragment(f) => fragments.push(f),
-        };
-    }
-
-    let op = match operation {
-        Some(op) => op,
-        None => return Err(GraphQLError::UnknownOperationName),
-    };
-
     let default_variable_values = op.item.variable_definitions.map(|defs| {
         defs.item
             .items
@@ -978,6 +867,7 @@ where
                 .schema
                 .mutation_type()
                 .expect("No mutation type found"),
+            OperationType::Subscription => unreachable!(),
         };
 
         let executor = Executor {
@@ -1006,6 +896,7 @@ where
                     .resolve_into_value_async(&root_node.mutation_info, &root_node.mutation_type)
                     .await
             }
+            OperationType::Subscription => unreachable!(),
         };
     }
 

juniper/src/lib.rs

@@ -90,7 +90,6 @@ Juniper has not reached 1.0 yet, thus some API instability should be expected.
 */
 #![doc(html_root_url = "https://docs.rs/juniper/0.14.0")]
 #![warn(missing_docs)]
-#![cfg_attr(feature = "async", feature(async_closure))]
 
 #[doc(hidden)]
 pub extern crate serde;

juniper_benchmarks/src/lib.rs

@@ -1,5 +1,3 @@
-#![feature(async_closure)]
-
 use juniper::{
     object, DefaultScalarValue, ExecutionError, FieldError, GraphQLEnum, Value, Variables,
 };

juniper_codegen/src/derive_object.rs

@@ -59,7 +59,8 @@ pub fn build_derive_object(ast: syn::DeriveInput, is_internal: bool) -> TokenStr
                 description: field_attrs.description,
                 deprecation: field_attrs.deprecation,
                 resolver_code,
-                resolver_code_async: None,
+                is_type_inferred: true,
+                is_async: false,
             })
         }
     });

juniper_codegen/src/impl_object.rs

@@ -197,29 +197,10 @@ pub fn build_object(args: TokenStream, body: TokenStream, is_internal: bool) ->
                 }
 
                 let body = &method.block;
-                let return_ty = &method.sig.output;
+                let resolver_code = quote!(
-
-                let (resolver_code, resolver_code_async) = if is_async {
-                    (
-                        quote!(),
-                        Some(quote!(
-                            (async move || #return_ty {
                     #( #resolve_parts )*
                     #body
-                            })()
+                );
-                        )),
-                    )
-                } else {
-                    (
-                        quote!(
-                            (|| #return_ty {
-                                #( #resolve_parts )*
-                                #body
-                            })()
-                        ),
-                        None,
-                    )
-                };
 
                 let ident = &method.sig.ident;
                 let name = attrs
@@ -233,7 +214,8 @@ pub fn build_object(args: TokenStream, body: TokenStream, is_internal: bool) ->
                     description: attrs.description,
                     deprecation: attrs.deprecation,
                     resolver_code,
-                    resolver_code_async,
+                    is_type_inferred: false,
+                    is_async,
                 });
             }
             _ => {

juniper_codegen/src/util.rs

@@ -597,14 +597,8 @@ pub struct GraphQLTypeDefinitionField {
     pub deprecation: Option<DeprecationAttr>,
     pub args: Vec<GraphQLTypeDefinitionFieldArg>,
     pub resolver_code: proc_macro2::TokenStream,
-    pub resolver_code_async: Option<proc_macro2::TokenStream>,
+    pub is_type_inferred: bool,
-}
+    pub is_async: bool,
-
-impl GraphQLTypeDefinitionField {
-    #[inline]
-    fn is_async(&self) -> bool {
-        self.resolver_code_async.is_some()
-    }
 }
 
 /// Definition of a graphql type based on information extracted
@@ -638,7 +632,7 @@ pub struct GraphQLTypeDefiniton {
 
 impl GraphQLTypeDefiniton {
     fn has_async_field(&self) -> bool {
-        self.fields.iter().any(|field| field.is_async())
+        self.fields.iter().any(|field| field.is_async)
     }
 
     pub fn into_tokens(self, juniper_crate_name: &str) -> proc_macro2::TokenStream {
@@ -711,7 +705,7 @@ impl GraphQLTypeDefiniton {
             let name = &field.name;
             let code = &field.resolver_code;
 
-            if field.is_async() {
+            if field.is_async {
                 // TODO: better error message with field/type name.
                 quote!(
                     #name => {
@@ -719,9 +713,15 @@ impl GraphQLTypeDefiniton {
                     },
                 )
             } else {
+                let _type = if field.is_type_inferred {
+                    quote!()
+                } else {
+                    let _type = &field._type;
+                    quote!(: #_type)
+                };
                 quote!(
                     #name => {
-                        let res = { #code };
+                        let res #_type = { #code };
                         #juniper_crate_name::IntoResolvable::into(
                             res,
                             executor.context()
@@ -811,12 +811,19 @@ impl GraphQLTypeDefiniton {
         let resolve_field_async = {
             let resolve_matches_async = self.fields.iter().map(|field| {
                 let name = &field.name;
+                let code = &field.resolver_code;
+                let _type = if field.is_type_inferred {
+                    quote!()
+                } else {
+                    let _type = &field._type;
+                    quote!(: #_type)
+                };
 
-                        if let Some(code) = field.resolver_code_async.as_ref() {
+                if field.is_async {
                     quote!(
                         #name => {
                             let f = async move {
-                                        let res = { #code }.await;
+                                let res #_type = async move { #code }.await;
 
                                 let inner_res = #juniper_crate_name::IntoResolvable::into(
                                     res,
@@ -837,8 +844,6 @@ impl GraphQLTypeDefiniton {
                         },
                     )
                 } else {
-                            let code = &field.resolver_code;
-
                     let inner = if !self.no_async {
                         quote!(
                             let f = async move {
@@ -866,7 +871,7 @@ impl GraphQLTypeDefiniton {
 
                     quote!(
                         #name => {
-                                    let res = { #code };
+                            let res #_type = { #code };
                             let res2 = #juniper_crate_name::IntoResolvable::into(
                                 res,
                                 executor.context()
@@ -877,7 +882,7 @@ impl GraphQLTypeDefiniton {
                 }
             });
 
-            let mut where_async = where_clause.cloned().unwrap_or_else(|| parse_quote!(where));;
+            let mut where_async = where_clause.cloned().unwrap_or_else(|| parse_quote!(where));
 
             where_async
                 .predicates

juniper_rocket/src/lib.rs

@@ -38,7 +38,6 @@ Check the LICENSE file for details.
 
 #![doc(html_root_url = "https://docs.rs/juniper_rocket/0.2.0")]
 #![feature(decl_macro, proc_macro_hygiene)]
-#![cfg_attr(feature = "async", feature(async_closure))]
 
 use std::{error::Error, io::Cursor};
 

juniper_warp/src/lib.rs

@@ -39,7 +39,6 @@ Check the LICENSE file for details.
 #![deny(missing_docs)]
 #![deny(warnings)]
 #![doc(html_root_url = "https://docs.rs/juniper_warp/0.2.0")]
-#![cfg_attr(feature = "async", feature(async_closure))]
 
 use futures::{future::poll_fn, Future};
 use serde::Deserialize;