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use crate::context::QueryEnv;
use crate::{registry, Context, Error, Pos, QueryError, Result, SchemaEnv, SubscriptionType, Type};
use futures::Stream;
use std::borrow::Cow;
use std::pin::Pin;
pub struct EmptySubscription;
impl Type for EmptySubscription {
fn type_name() -> Cow<'static, str> {
Cow::Borrowed("EmptyMutation")
}
fn create_type_info(registry: &mut registry::Registry) -> String {
registry.create_type::<Self, _>(|_| registry::MetaType::Object {
name: "EmptySubscription".to_string(),
description: None,
fields: Default::default(),
cache_control: Default::default(),
extends: false,
keys: None,
})
}
}
#[async_trait::async_trait]
impl SubscriptionType for EmptySubscription {
fn is_empty() -> bool {
true
}
async fn create_field_stream(
&self,
_idx: usize,
_ctx: &Context<'_>,
_schema_env: SchemaEnv,
_query_env: QueryEnv,
) -> Result<Pin<Box<dyn Stream<Item = Result<serde_json::Value>> + Send>>>
where
Self: Send + Sync + 'static + Sized,
{
Err(Error::Query {
pos: Pos::default(),
path: None,
err: QueryError::NotConfiguredSubscriptions,
})
}
}