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Executor

juniper::executor

Struct Executor 

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pub struct Executor<'r, 'a, CtxT, S = DefaultScalarValue>
where
    CtxT: 'a,
    S: 'a,
{ /* private fields */ }
Expand description

Query execution engine

The executor helps drive the query execution in a schema. It keeps track of the current field stack, context, variables, and errors.

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impl<'r, 'a, CtxT, S> Executor<'r, 'a, CtxT, S>
where S: ScalarValue,

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pub async fn resolve_into_stream<'i, 'v, 'res, T>( &'r self, info: &'i T::TypeInfo, value: &'v T, ) -> Value<ValuesStream<'res, S>>
where T: GraphQLSubscriptionValue<S, Context = CtxT> + ?Sized, T::TypeInfo: Sync, CtxT: Sync, S: Send + Sync, 'i: 'res, 'v: 'res, 'a: 'res,

Resolve a single arbitrary value into a stream of Values. If a field fails to resolve, pushes error to Executor and returns Value::Null.

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pub async fn subscribe<'s, 't, 'res, T>( &'r self, info: &'t T::TypeInfo, value: &'t T, ) -> Result<Value<ValuesStream<'res, S>>, FieldError<S>>
where T: GraphQLSubscriptionValue<S, Context = CtxT> + ?Sized, T::TypeInfo: Sync, CtxT: Sync, S: Send + Sync, 't: 'res, 'a: 'res,

Resolve a single arbitrary value into a stream of Values. Calls resolve_into_stream on T.

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pub fn resolve_with_ctx<NewCtxT, T>( &self, info: &T::TypeInfo, value: &T, ) -> ExecutionResult<S>
where NewCtxT: FromContext<CtxT>, T: GraphQLValue<S, Context = NewCtxT> + ?Sized,

Resolve a single arbitrary value, mapping the context to a new type

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pub fn resolve<T>(&self, info: &T::TypeInfo, value: &T) -> ExecutionResult<S>
where T: GraphQLValue<S, Context = CtxT> + ?Sized,

Resolve a single arbitrary value into an ExecutionResult

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pub async fn resolve_async<T>( &self, info: &T::TypeInfo, value: &T, ) -> ExecutionResult<S>
where T: GraphQLValueAsync<S, Context = CtxT> + ?Sized, T::TypeInfo: Sync, CtxT: Sync, S: Send + Sync,

Resolve a single arbitrary value into an ExecutionResult

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pub async fn resolve_with_ctx_async<NewCtxT, T>( &self, info: &T::TypeInfo, value: &T, ) -> ExecutionResult<S>
where T: GraphQLValueAsync<S, Context = NewCtxT> + ?Sized, T::TypeInfo: Sync, NewCtxT: FromContext<CtxT> + Sync, S: Send + Sync,

Resolve a single arbitrary value, mapping the context to a new type

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pub fn resolve_into_value<T>(&self, info: &T::TypeInfo, value: &T) -> Value<S>
where T: GraphQLValue<S, Context = CtxT>,

Resolve a single arbitrary value into a return value

If the field fails to resolve, null will be returned.

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pub async fn resolve_into_value_async<T>( &self, info: &T::TypeInfo, value: &T, ) -> Value<S>
where T: GraphQLValueAsync<S, Context = CtxT> + ?Sized, T::TypeInfo: Sync, CtxT: Sync, S: Send + Sync,

Resolve a single arbitrary value into a return value

If the field fails to resolve, null will be returned.

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pub fn replaced_context<'b, NewCtxT>( &'b self, ctx: &'b NewCtxT, ) -> Executor<'b, 'b, NewCtxT, S>

Derive a new executor by replacing the context

This can be used to connect different types, e.g. from different Rust libraries, that require different context types.

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pub fn context(&self) -> &'r CtxT

Access the current context

You usually provide the context when calling the top-level execute function, or using the context factory.

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pub fn schema(&self) -> &'a SchemaType<S>

The currently executing schema

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pub fn location(&self) -> &SourcePosition

The current location of the executor

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pub fn push_error(&self, error: FieldError<S>)

Add an error to the execution engine at the current executor location

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pub fn push_error_at(&self, error: FieldError<S>, location: SourcePosition)

Add an error to the execution engine at a specific location

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pub fn new_error(&self, error: FieldError<S>) -> ExecutionError<S>

Returns new ExecutionError at current location

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pub fn look_ahead(&'a self) -> LookAheadSelection<'a, S>

Construct a lookahead selection for the current selection.

This allows seeing the whole selection and perform operations affecting the children.

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pub fn as_owned_executor(&self) -> OwnedExecutor<'a, CtxT, S>

Create new OwnedExecutor and clone all current data (except for errors) there

New empty vector is created for errors because existing errors won’t be needed to be accessed by user in OwnedExecutor as existing errors will be returned in execute_query/execute_mutation/resolve_into_stream/etc.

Auto Trait Implementations§

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impl<'r, 'a, CtxT, S> Freeze for Executor<'r, 'a, CtxT, S>

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impl<'r, 'a, CtxT, S> RefUnwindSafe for Executor<'r, 'a, CtxT, S>
where CtxT: RefUnwindSafe, S: RefUnwindSafe,

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impl<'r, 'a, CtxT, S> Send for Executor<'r, 'a, CtxT, S>
where CtxT: Sync, S: Sync + Send,

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impl<'r, 'a, CtxT, S> Sync for Executor<'r, 'a, CtxT, S>
where CtxT: Sync, S: Sync + Send,

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impl<'r, 'a, CtxT, S> Unpin for Executor<'r, 'a, CtxT, S>

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impl<'r, 'a, CtxT, S> UnwindSafe for Executor<'r, 'a, CtxT, S>
where CtxT: RefUnwindSafe, S: RefUnwindSafe,

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impl<T> Any for T
where T: 'static + ?Sized,

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Gets the TypeId of self. Read more
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where T: Any + ?Sized,

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Returns true if the this type is the same as T.
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Returns Some reference to this value if it’s of type T, or None otherwise.
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Returns Some mutable reference to this value if it’s of type T, or None otherwise.
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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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where Self: Binary,

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where Self: Display,

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where Self: UpperExp,

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where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted.
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where &'a Self: for<'a> IntoIterator,

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Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn pipe<R>(self, func: impl FnOnce(Self) -> R) -> R
where Self: Sized,

Pipes by value. This is generally the method you want to use. Read more
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where R: 'a,

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where Self: Borrow<B>, B: 'a + ?Sized, R: 'a,

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Mutable access to a value. Read more
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