292 lines
9.5 KiB
Rust
292 lines
9.5 KiB
Rust
use crate::context::Data;
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use crate::model::__DirectiveLocation;
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use crate::registry::{Directive, InputValue, Registry};
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use crate::types::QueryRoot;
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use crate::validation::check_rules;
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use crate::{
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ContextBase, GQLObject, GQLOutputValue, GQLType, QueryError, QueryParseError, Result, Variables,
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};
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use graphql_parser::parse_query;
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use graphql_parser::query::{
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Definition, FragmentDefinition, OperationDefinition, SelectionSet, VariableDefinition,
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};
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use std::any::Any;
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use std::collections::HashMap;
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/// GraphQL schema
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pub struct Schema<Query, Mutation> {
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query: QueryRoot<Query>,
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mutation: Mutation,
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registry: Registry,
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data: Data,
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}
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impl<Query: GQLObject, Mutation: GQLObject> Schema<Query, Mutation> {
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/// Create a schema.
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///
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/// The root object for the query and Mutation needs to be specified.
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/// If there is no mutation, you can use `GQLEmptyMutation`.
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pub fn new(query: Query, mutation: Mutation) -> Self {
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let mut registry = Registry {
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types: Default::default(),
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directives: Default::default(),
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implements: Default::default(),
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query_type: Query::type_name().to_string(),
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mutation_type: if Mutation::is_empty() {
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None
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} else {
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Some(Mutation::type_name().to_string())
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},
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};
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registry.add_directive(Directive {
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name: "include",
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description: Some("Directs the executor to include this field or fragment only when the `if` argument is true."),
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locations: vec![
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__DirectiveLocation::FIELD,
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__DirectiveLocation::FRAGMENT_SPREAD,
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__DirectiveLocation::INLINE_FRAGMENT
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],
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args: {
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let mut args = HashMap::new();
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args.insert("if", InputValue {
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name: "if",
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description: Some("Included when true."),
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ty: "Boolean!".to_string(),
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default_value: None
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});
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args
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}
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});
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registry.add_directive(Directive {
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name: "skip",
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description: Some("Directs the executor to skip this field or fragment when the `if` argument is true."),
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locations: vec![
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__DirectiveLocation::FIELD,
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__DirectiveLocation::FRAGMENT_SPREAD,
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__DirectiveLocation::INLINE_FRAGMENT
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],
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args: {
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let mut args = HashMap::new();
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args.insert("if", InputValue {
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name: "if",
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description: Some("Skipped when true."),
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ty: "Boolean!".to_string(),
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default_value: None
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});
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args
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}
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});
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// register scalars
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bool::create_type_info(&mut registry);
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i32::create_type_info(&mut registry);
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f32::create_type_info(&mut registry);
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String::create_type_info(&mut registry);
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QueryRoot::<Query>::create_type_info(&mut registry);
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if !Mutation::is_empty() {
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Mutation::create_type_info(&mut registry);
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}
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Self {
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query: QueryRoot { inner: query },
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mutation,
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registry,
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data: Default::default(),
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}
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}
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/// Add a global data that can be accessed in the `Context`.
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pub fn data<D: Any + Send + Sync>(mut self, data: D) -> Self {
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self.data.insert(data);
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self
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}
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/// Start a query and return `QueryBuilder`.
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pub fn query<'a>(&'a self, query_source: &'a str) -> QueryBuilder<'a, Query, Mutation> {
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QueryBuilder {
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query: &self.query,
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mutation: &self.mutation,
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registry: &self.registry,
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query_source,
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operation_name: None,
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variables: None,
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data: &self.data,
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}
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}
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}
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enum Root<'a, Query, Mutation> {
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Query(&'a QueryRoot<Query>),
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Mutation(&'a Mutation),
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}
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/// Query builder
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pub struct QueryBuilder<'a, Query, Mutation> {
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query: &'a QueryRoot<Query>,
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mutation: &'a Mutation,
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registry: &'a Registry,
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query_source: &'a str,
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operation_name: Option<&'a str>,
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variables: Option<Variables>,
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data: &'a Data,
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}
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impl<'a, Query, Mutation> QueryBuilder<'a, Query, Mutation> {
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/// Specify the operation name.
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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),
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..self
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}
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}
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/// Specify the variables.
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pub fn variables(self, vars: Variables) -> Self {
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QueryBuilder {
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variables: Some(vars),
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..self
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}
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}
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/// Prepare query
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pub fn prepare(self) -> Result<PreparedQuery<'a, Query, Mutation>> {
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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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check_rules(self.registry, &document)?;
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let mut fragments = HashMap::new();
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let mut selection_set = None;
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let mut variable_definitions = None;
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let mut root = None;
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for definition in document.definitions {
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match definition {
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Definition::Operation(operation_definition) => match operation_definition {
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OperationDefinition::SelectionSet(s) => {
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selection_set = Some(s);
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root = Some(Root::Query(self.query));
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break;
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}
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OperationDefinition::Query(query)
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if query.name.is_none() || query.name.as_deref() == self.operation_name =>
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{
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selection_set = Some(query.selection_set);
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variable_definitions = Some(query.variable_definitions);
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root = Some(Root::Query(self.query));
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break;
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}
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OperationDefinition::Mutation(mutation)
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if mutation.name.is_none()
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|| mutation.name.as_deref() == self.operation_name =>
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{
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selection_set = Some(mutation.selection_set);
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variable_definitions = Some(mutation.variable_definitions);
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root = Some(Root::Mutation(self.mutation));
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break;
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}
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OperationDefinition::Subscription(subscription)
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if subscription.name.is_none()
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|| subscription.name.as_deref() == self.operation_name =>
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{
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return Err(QueryError::NotSupported.into());
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}
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_ => {}
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},
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Definition::Fragment(fragment) => {
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fragments.insert(fragment.name.clone(), fragment);
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}
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}
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}
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Ok(PreparedQuery {
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registry: self.registry,
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variables: self.variables.unwrap_or_default(),
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data: self.data,
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fragments,
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selection_set: selection_set.ok_or({
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if let Some(name) = self.operation_name {
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QueryError::UnknownOperationNamed {
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name: name.to_string(),
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}
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} else {
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QueryError::MissingOperation
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}
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})?,
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root: root.unwrap(),
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variable_definitions,
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})
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}
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/// Execute the query.
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pub async fn execute(self) -> Result<serde_json::Value>
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where
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Query: GQLObject + Send + Sync,
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Mutation: GQLObject + Send + Sync,
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{
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self.prepare()?.execute().await
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}
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}
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pub struct PreparedQuery<'a, Query, Mutation> {
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root: Root<'a, Query, Mutation>,
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registry: &'a Registry,
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variables: Variables,
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data: &'a Data,
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fragments: HashMap<String, FragmentDefinition>,
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selection_set: SelectionSet,
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variable_definitions: Option<Vec<VariableDefinition>>,
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}
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impl<'a, Query, Mutation> PreparedQuery<'a, Query, Mutation> {
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/// Detects whether any parameter contains the Upload type
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pub fn is_upload(&self) -> bool {
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if let Some(variable_definitions) = &self.variable_definitions {
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for d in variable_definitions {
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if let Some(ty) = self.registry.basic_type_by_parsed_type(&d.var_type) {
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if ty.name() == "Upload" {
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return true;
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}
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}
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}
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}
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false
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}
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/// Set upload files
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pub fn set_upload(
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&mut self,
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var_path: &str,
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filename: &str,
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content_type: Option<&str>,
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content: Vec<u8>,
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) {
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self.variables
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.set_upload(var_path, filename, content_type, content);
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}
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/// Execute the query.
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pub async fn execute(self) -> Result<serde_json::Value>
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where
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Query: GQLObject + Send + Sync,
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Mutation: GQLObject + Send + Sync,
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{
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let ctx = ContextBase {
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item: &self.selection_set,
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variables: &self.variables,
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variable_definitions: self.variable_definitions.as_deref(),
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registry: self.registry.clone(),
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data: self.data,
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fragments: &self.fragments,
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};
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match self.root {
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Root::Query(query) => return GQLOutputValue::resolve(query, &ctx).await,
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Root::Mutation(mutation) => return GQLOutputValue::resolve(mutation, &ctx).await,
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}
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}
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}
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