50 lines
1.4 KiB
Rust
50 lines
1.4 KiB
Rust
use std::{borrow::Cow, pin::Pin};
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use futures_util::stream::{self, Stream};
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use crate::{registry, Context, Response, ServerError, SubscriptionType};
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/// Empty subscription
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///
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/// Only the parameters used to construct the Schema, representing an
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/// unconfigured subscription.
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#[derive(Default, Copy, Clone)]
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pub struct EmptySubscription;
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impl SubscriptionType 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_subscription_type::<Self, _>(|_| registry::MetaType::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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visible: None,
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is_subscription: true,
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rust_typename: std::any::type_name::<Self>(),
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})
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}
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fn is_empty() -> bool {
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true
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}
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fn create_field_stream<'a>(
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&'a self,
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_ctx: &'a Context<'_>,
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) -> Option<Pin<Box<dyn Stream<Item = Response> + Send + 'a>>>
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where
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Self: Send + Sync + 'static + Sized,
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{
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Some(Box::pin(stream::once(async move {
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let err = ServerError::new("Schema is not configured for subscription.", None);
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Response::from_errors(vec![err])
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})))
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}
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}
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