122 lines
3.2 KiB
Rust
122 lines
3.2 KiB
Rust
use std::borrow::Cow;
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use crate::parser::types::Field;
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use crate::registry::Registry;
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use crate::{
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registry, ContainerType, ContextSelectionSet, InputValueResult, Positioned, Result,
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ServerResult, Value,
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};
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#[doc(hidden)]
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pub trait Description {
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fn description() -> &'static str;
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}
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/// Represents a GraphQL type.
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///
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/// All GraphQL types implement this trait, such as `Scalar`, `Object`, `Union` ...
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pub trait Type {
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/// Type the name.
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fn type_name() -> Cow<'static, str>;
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/// Qualified typename.
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fn qualified_type_name() -> String {
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format!("{}!", Self::type_name())
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}
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/// Introspection type name
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///
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/// Is the return value of field `__typename`, the interface and union should return the current type, and the others return `Type::type_name`.
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fn introspection_type_name(&self) -> Cow<'static, str> {
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Self::type_name()
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}
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/// Create type information in the registry and return qualified typename.
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fn create_type_info(registry: &mut registry::Registry) -> String;
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}
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/// Represents a GraphQL input value.
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pub trait InputType: Type + Sized {
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/// Parse from `Value`. None represents undefined.
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fn parse(value: Option<Value>) -> InputValueResult<Self>;
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/// Convert to a `Value` for introspection.
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fn to_value(&self) -> Value;
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}
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/// Represents a GraphQL output value.
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#[async_trait::async_trait]
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pub trait OutputType: Type {
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/// Resolve an output value to `async_graphql::Value`.
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async fn resolve(
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&self,
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ctx: &ContextSelectionSet<'_>,
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field: &Positioned<Field>,
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) -> ServerResult<Value>;
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}
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impl<T: Type + Send + Sync + ?Sized> Type for &T {
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fn type_name() -> Cow<'static, str> {
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T::type_name()
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}
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fn create_type_info(registry: &mut Registry) -> String {
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T::create_type_info(registry)
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}
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}
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#[async_trait::async_trait]
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impl<T: OutputType + Send + Sync + ?Sized> OutputType for &T {
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#[allow(clippy::trivially_copy_pass_by_ref)]
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async fn resolve(
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&self,
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ctx: &ContextSelectionSet<'_>,
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field: &Positioned<Field>,
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) -> ServerResult<Value> {
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T::resolve(*self, ctx, field).await
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}
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}
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impl<T: Type> Type for Result<T> {
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fn type_name() -> Cow<'static, str> {
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T::type_name()
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}
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fn qualified_type_name() -> String {
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T::qualified_type_name()
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}
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fn create_type_info(registry: &mut registry::Registry) -> String {
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T::create_type_info(registry)
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}
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}
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#[async_trait::async_trait]
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impl<T: OutputType + Sync> OutputType for Result<T> {
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async fn resolve(
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&self,
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ctx: &ContextSelectionSet<'_>,
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field: &Positioned<Field>,
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) -> ServerResult<Value> {
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match self {
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Ok(value) => Ok(value.resolve(ctx, field).await?),
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Err(err) => Err(err.clone().into_server_error().at(field.pos)),
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}
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}
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}
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/// A GraphQL object.
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pub trait ObjectType: ContainerType {}
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#[async_trait::async_trait]
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impl<T: ObjectType + Send + Sync> ObjectType for &T {}
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/// A GraphQL interface.
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pub trait InterfaceType: ContainerType {}
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/// A GraphQL interface.
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pub trait UnionType: ContainerType {}
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/// A GraphQL input object.
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pub trait InputObjectType: InputType {}
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