68 lines
1.9 KiB
Rust
68 lines
1.9 KiB
Rust
use crate::context::Environment;
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use crate::{
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registry, Context, ContextSelectionSet, Error, ObjectType, OutputValueType, Pos, QueryError,
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Result, Schema, SubscriptionType, Type,
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};
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use futures::Stream;
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use std::borrow::Cow;
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use std::pin::Pin;
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use std::sync::Arc;
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/// Empty subscription
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///
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/// Only the parameters used to construct the Schema, representing an unconfigured subscription.
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pub struct EmptySubscription;
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impl Type for EmptySubscription {
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fn type_name() -> Cow<'static, str> {
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Cow::Borrowed("EmptyMutation")
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}
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fn create_type_info(registry: &mut registry::Registry) -> String {
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registry.create_type::<Self, _>(|_| registry::Type::Object {
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name: "EmptySubscription".to_string(),
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description: None,
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fields: Default::default(),
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cache_control: Default::default(),
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extends: false,
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keys: None,
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})
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}
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}
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#[async_trait::async_trait]
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impl SubscriptionType for EmptySubscription {
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fn is_empty() -> bool {
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true
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}
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async fn create_field_stream<Query, Mutation>(
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&self,
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_ctx: &Context<'_>,
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_schema: &Schema<Query, Mutation, Self>,
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_environment: Arc<Environment>,
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) -> Result<Pin<Box<dyn Stream<Item = Result<serde_json::Value>> + Send>>>
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where
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Query: ObjectType + Send + Sync + 'static,
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Mutation: ObjectType + Send + Sync + 'static,
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Self: Send + Sync + 'static + Sized,
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{
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Err(Error::Query {
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pos: Pos::default(),
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path: None,
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err: QueryError::NotConfiguredSubscriptions,
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})
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}
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}
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#[async_trait::async_trait]
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impl OutputValueType for EmptySubscription {
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async fn resolve(&self, _ctx: &ContextSelectionSet<'_>, pos: Pos) -> Result<serde_json::Value> {
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Err(Error::Query {
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pos,
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path: None,
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err: QueryError::NotConfiguredSubscriptions,
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})
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}
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}
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