async-graphql/src/schema.rs

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use crate::model::__DirectiveLocation;
use crate::registry::{Directive, InputValue, Registry};
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use crate::types::QueryRoot;
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use crate::{
ContextBase, Data, ErrorWithPosition, GQLObject, GQLOutputValue, GQLType, QueryError,
QueryParseError, Result, Variables,
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};
use graphql_parser::parse_query;
use graphql_parser::query::{Definition, OperationDefinition};
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use serde::export::PhantomData;
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pub struct Schema<Query, Mutation> {
mark_query: PhantomData<Query>,
mark_mutation: PhantomData<Mutation>,
registry: Registry,
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}
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impl<Query: GQLObject, Mutation: GQLObject> Schema<Query, Mutation> {
pub fn new() -> Self {
let mut registry = Registry::default();
registry.add_directive(Directive {
name: "include",
description: Some("Directs the executor to include this field or fragment only when the `if` argument is true."),
locations: vec![__DirectiveLocation::FIELD],
args: vec![InputValue{
name: "if",
description: Some("Included when true."),
ty: "Boolean!".to_string(),
default_value: None
}]
});
registry.add_directive(Directive {
name: "skip",
description: Some("Directs the executor to skip this field or fragment when the `if` argument is true."),
locations: vec![__DirectiveLocation::FIELD],
args: vec![InputValue{
name: "if",
description: Some("Skipped when true."),
ty: "Boolean!".to_string(),
default_value: None
}]
});
// register scalars
bool::create_type_info(&mut registry);
i32::create_type_info(&mut registry);
f32::create_type_info(&mut registry);
String::create_type_info(&mut registry);
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Query::create_type_info(&mut registry);
Mutation::create_type_info(&mut registry);
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Self {
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mark_query: PhantomData,
mark_mutation: PhantomData,
registry,
}
}
pub fn query<'a>(
&'a self,
query: Query,
mutation: Mutation,
query_source: &'a str,
) -> QueryBuilder<'a, Query, Mutation> {
QueryBuilder {
query: QueryRoot {
inner: query,
query_type: Query::type_name().to_string(),
mutation_type: Mutation::type_name().to_string(),
},
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mutation,
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registry: &self.registry,
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query_source,
operation_name: None,
variables: None,
data: None,
}
}
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}
pub struct QueryBuilder<'a, Query, Mutation> {
query: QueryRoot<Query>,
mutation: Mutation,
registry: &'a Registry,
query_source: &'a str,
operation_name: Option<&'a str>,
variables: Option<&'a Variables>,
data: Option<&'a Data>,
}
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impl<'a, Query, Mutation> QueryBuilder<'a, Query, Mutation> {
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pub fn operator_name(self, name: &'a str) -> Self {
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QueryBuilder {
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operation_name: Some(name),
..self
}
}
pub fn variables(self, vars: &'a Variables) -> Self {
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QueryBuilder {
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variables: Some(vars),
..self
}
}
pub fn data(self, data: &'a Data) -> Self {
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QueryBuilder {
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data: Some(data),
..self
}
}
pub async fn execute(self) -> Result<serde_json::Value>
where
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Query: GQLObject + Send + Sync,
Mutation: GQLObject + Send + Sync,
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{
let document =
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parse_query(self.query_source).map_err(|err| QueryParseError(err.to_string()))?;
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for definition in &document.definitions {
match definition {
Definition::Operation(OperationDefinition::SelectionSet(selection_set)) => {
if self.operation_name.is_none() {
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let ctx = ContextBase {
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item: selection_set,
data: self.data.as_deref(),
variables: self.variables.as_deref(),
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variable_definitions: None,
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registry: &self.registry,
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};
return self.query.resolve(&ctx).await;
}
}
Definition::Operation(OperationDefinition::Query(query)) => {
if self.operation_name.is_none()
|| self.operation_name == query.name.as_ref().map(|s| s.as_str())
{
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let ctx = ContextBase {
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item: &query.selection_set,
data: self.data.as_deref(),
variables: self.variables.as_deref(),
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variable_definitions: Some(&query.variable_definitions),
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registry: self.registry.clone(),
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};
return self.query.resolve(&ctx).await;
}
}
Definition::Operation(OperationDefinition::Mutation(mutation)) => {
if self.operation_name.is_none()
|| self.operation_name == mutation.name.as_ref().map(|s| s.as_str())
{
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let ctx = ContextBase {
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item: &mutation.selection_set,
data: self.data.as_deref(),
variables: self.variables.as_deref(),
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variable_definitions: Some(&mutation.variable_definitions),
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registry: self.registry.clone(),
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};
return self.mutation.resolve(&ctx).await;
}
}
Definition::Operation(OperationDefinition::Subscription(subscription)) => {
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anyhow::bail!(QueryError::NotSupported.with_position(subscription.position));
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}
Definition::Fragment(fragment) => {
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anyhow::bail!(QueryError::NotSupported.with_position(fragment.position));
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}
}
}
if let Some(operation_name) = self.operation_name {
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anyhow::bail!(QueryError::UnknownOperationNamed {
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name: operation_name.to_string()
});
}
Ok(serde_json::Value::Null)
}
}