112 lines
3.8 KiB
Rust
112 lines
3.8 KiB
Rust
use crate::{
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Context, Data, ErrorWithPosition, GQLObject, QueryError, QueryParseError, Result,
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Variables,
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};
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use graphql_parser::parse_query;
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use graphql_parser::query::{Definition, OperationDefinition};
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pub struct QueryBuilder<'a, Query, Mutation> {
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query: Query,
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mutation: Mutation,
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query_source: &'a str,
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operation_name: Option<&'a str>,
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variables: Option<&'a Variables>,
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data: Option<&'a Data>,
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}
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impl<'a, Query, Mutation> QueryBuilder<'a, Query, Mutation> {
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pub fn new(query: Query, mutation: Mutation, query_source: &'a str) -> Self {
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Self {
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query,
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mutation,
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query_source,
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operation_name: None,
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variables: None,
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data: None,
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}
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}
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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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pub fn variables(self, vars: &'a 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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pub fn data(self, data: &'a Data) -> Self {
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QueryBuilder {
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data: Some(data),
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..self
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}
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}
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pub async fn execute(self) -> Result<serde_json::Value>
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where
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Query: GQLObject,
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Mutation: GQLObject,
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{
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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 {
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match definition {
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Definition::Operation(OperationDefinition::SelectionSet(selection_set)) => {
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if self.operation_name.is_none() {
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let ctx = Context {
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item: selection_set,
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data: self.data.as_deref(),
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variables: self.variables.as_deref(),
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};
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return self.query.resolve(&ctx).await;
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}
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}
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Definition::Operation(OperationDefinition::Query(query)) => {
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if self.operation_name.is_none()
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|| self.operation_name == query.name.as_ref().map(|s| s.as_str())
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{
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let ctx = Context {
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item: &query.selection_set,
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data: self.data.as_deref(),
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variables: self.variables.as_deref(),
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};
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return self.query.resolve(&ctx).await;
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}
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}
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Definition::Operation(OperationDefinition::Mutation(mutation)) => {
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if self.operation_name.is_none()
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|| self.operation_name == mutation.name.as_ref().map(|s| s.as_str())
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{
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let ctx = Context {
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item: &mutation.selection_set,
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data: self.data.as_deref(),
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variables: self.variables.as_deref(),
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};
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return self.mutation.resolve(&ctx).await;
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}
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}
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Definition::Operation(OperationDefinition::Subscription(subscription)) => {
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anyhow::bail!(QueryError::NotSupported.with_position(subscription.position));
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}
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Definition::Fragment(fragment) => {
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anyhow::bail!(QueryError::NotSupported.with_position(fragment.position));
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}
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}
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}
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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()
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});
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}
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Ok(serde_json::Value::Null)
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}
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}
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