61 lines
1.6 KiB
Rust
61 lines
1.6 KiB
Rust
use crate::{
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registry, ContextBase, ContextSelectionSet, JsonWriter, OutputValueType, QueryError, Result,
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SubscriptionType, Type,
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};
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use graphql_parser::query::Field;
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use std::any::{Any, TypeId};
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use std::borrow::Cow;
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use std::collections::hash_map::RandomState;
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use std::collections::HashMap;
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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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})
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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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fn create_type(_field: &Field, _types: &mut HashMap<TypeId, Field>) -> Result<()> {
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unreachable!()
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}
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async fn resolve(
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&self,
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_ctx: &ContextBase<'_, ()>,
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_types: &HashMap<TypeId, Field, RandomState>,
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_msg: &(dyn Any + Send + Sync),
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) -> Result<Option<String>> {
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unreachable!()
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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(
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_value: &Self,
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_ctx: &ContextSelectionSet<'_>,
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_w: &mut JsonWriter,
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) -> Result<()> {
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Err(QueryError::NotConfiguredSubscriptions.into())
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}
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}
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