622 lines
17 KiB
Rust
622 lines
17 KiB
Rust
use crate::extensions::Extensions;
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use crate::parser::query::{Directive, Field, SelectionSet};
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use crate::schema::SchemaEnv;
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use crate::{
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InputValueType, Lookahead, Pos, Positioned, QueryError, QueryResponse, Result, Type, Value,
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};
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use async_graphql_parser::query::Document;
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use async_graphql_parser::UploadValue;
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use fnv::FnvHashMap;
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use futures::Future;
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use parking_lot::Mutex;
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use std::any::{Any, TypeId};
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use std::collections::BTreeMap;
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use std::fs::File;
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use std::ops::{Deref, DerefMut};
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use std::pin::Pin;
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use std::sync::atomic::AtomicUsize;
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use std::sync::Arc;
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/// Variables of query
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#[derive(Debug, Clone)]
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pub struct Variables(Value);
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impl Default for Variables {
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fn default() -> Self {
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Self(Value::Object(Default::default()))
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}
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}
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impl Deref for Variables {
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type Target = BTreeMap<String, Value>;
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fn deref(&self) -> &Self::Target {
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if let Value::Object(obj) = &self.0 {
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obj
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} else {
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unreachable!()
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}
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}
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}
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impl DerefMut for Variables {
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fn deref_mut(&mut self) -> &mut Self::Target {
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if let Value::Object(obj) = &mut self.0 {
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obj
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} else {
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unreachable!()
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}
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}
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}
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impl Variables {
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/// Parse variables from JSON object.
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pub fn parse_from_json(value: serde_json::Value) -> Result<Self> {
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if let Value::Object(obj) = value.into() {
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Ok(Variables(Value::Object(obj)))
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} else {
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Ok(Default::default())
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}
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}
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pub(crate) fn set_upload(
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&mut self,
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var_path: &str,
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filename: String,
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content_type: Option<String>,
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content: File,
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) {
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let mut it = var_path.split('.').peekable();
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if let Some(first) = it.next() {
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if first != "variables" {
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return;
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}
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}
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let mut current = &mut self.0;
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while let Some(s) = it.next() {
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let has_next = it.peek().is_some();
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if let Ok(idx) = s.parse::<i32>() {
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if let Value::List(ls) = current {
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if let Some(value) = ls.get_mut(idx as usize) {
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if !has_next {
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*value = Value::Upload(UploadValue {
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filename,
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content_type,
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content,
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});
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return;
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} else {
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current = value;
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}
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} else {
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return;
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}
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}
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} else if let Value::Object(obj) = current {
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if let Some(value) = obj.get_mut(s) {
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if !has_next {
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*value = Value::Upload(UploadValue {
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filename,
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content_type,
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content,
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});
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return;
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} else {
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current = value;
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}
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} else {
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return;
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}
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}
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}
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}
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}
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#[derive(Default)]
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/// Schema/Context data
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pub struct Data(FnvHashMap<TypeId, Box<dyn Any + Sync + Send>>);
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impl Data {
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#[allow(missing_docs)]
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pub fn insert<D: Any + Send + Sync>(&mut self, data: D) {
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self.0.insert(TypeId::of::<D>(), Box::new(data));
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}
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}
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/// Context for `SelectionSet`
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pub type ContextSelectionSet<'a> = ContextBase<'a, &'a Positioned<SelectionSet>>;
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/// Context object for resolve field
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pub type Context<'a> = ContextBase<'a, &'a Positioned<Field>>;
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/// The query path segment
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#[derive(Clone)]
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pub enum QueryPathSegment<'a> {
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/// Index
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Index(usize),
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/// Field name
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Name(&'a str),
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}
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/// The query path node
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#[derive(Clone)]
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pub struct QueryPathNode<'a> {
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/// Parent node
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pub parent: Option<&'a QueryPathNode<'a>>,
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/// Current path segment
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pub segment: QueryPathSegment<'a>,
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}
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impl<'a> std::fmt::Display for QueryPathNode<'a> {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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let mut first = true;
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self.for_each(|segment| {
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if !first {
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write!(f, ".").ok();
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}
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match segment {
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QueryPathSegment::Index(idx) => {
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write!(f, "{}", *idx).ok();
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}
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QueryPathSegment::Name(name) => {
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write!(f, "{}", name).ok();
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}
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}
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first = false;
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});
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Ok(())
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}
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}
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impl<'a> QueryPathNode<'a> {
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pub(crate) fn field_name(&self) -> &str {
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let mut p = self;
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loop {
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if let QueryPathSegment::Name(name) = &p.segment {
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return name;
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}
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p = p.parent.unwrap();
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}
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}
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pub(crate) fn for_each<F: FnMut(&QueryPathSegment<'a>)>(&self, mut f: F) {
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self.for_each_ref(&mut f);
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}
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fn for_each_ref<F: FnMut(&QueryPathSegment<'a>)>(&self, f: &mut F) {
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if let Some(parent) = &self.parent {
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parent.for_each_ref(f);
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}
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f(&self.segment);
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}
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#[doc(hidden)]
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pub fn to_json(&self) -> Vec<serde_json::Value> {
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let mut path: Vec<serde_json::Value> = Vec::new();
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self.for_each(|segment| {
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path.push(match segment {
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QueryPathSegment::Index(idx) => (*idx).into(),
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QueryPathSegment::Name(name) => (*name).to_string().into(),
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})
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});
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path
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}
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}
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/// Represents the unique id of the resolve
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#[derive(Copy, Clone, Debug)]
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pub struct ResolveId {
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/// Parent id
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pub parent: Option<usize>,
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/// Current id
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pub current: usize,
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}
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impl ResolveId {
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pub(crate) fn root() -> ResolveId {
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ResolveId {
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parent: None,
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current: 0,
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}
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}
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}
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impl std::fmt::Display for ResolveId {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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if let Some(parent) = self.parent {
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write!(f, "{}:{}", parent, self.current)
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} else {
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write!(f, "{}", self.current)
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}
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}
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}
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#[doc(hidden)]
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pub type BoxDeferFuture =
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Pin<Box<dyn Future<Output = Result<(QueryResponse, DeferList)>> + Send + 'static>>;
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#[doc(hidden)]
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pub struct DeferList {
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pub path_prefix: Vec<serde_json::Value>,
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pub futures: Mutex<Vec<BoxDeferFuture>>,
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}
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impl DeferList {
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pub(crate) fn append<F>(&self, fut: F)
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where
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F: Future<Output = Result<(QueryResponse, DeferList)>> + Send + 'static,
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{
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self.futures.lock().push(Box::pin(fut));
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}
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}
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/// Query context
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#[derive(Clone)]
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pub struct ContextBase<'a, T> {
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#[allow(missing_docs)]
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pub path_node: Option<QueryPathNode<'a>>,
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pub(crate) resolve_id: ResolveId,
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pub(crate) inc_resolve_id: &'a AtomicUsize,
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#[doc(hidden)]
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pub item: T,
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pub(crate) schema_env: &'a SchemaEnv,
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pub(crate) query_env: &'a QueryEnv,
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pub(crate) defer_list: Option<&'a DeferList>,
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}
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impl<'a, T> Deref for ContextBase<'a, T> {
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type Target = T;
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fn deref(&self) -> &Self::Target {
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&self.item
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}
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}
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#[doc(hidden)]
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pub struct QueryEnvInner {
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pub extensions: Extensions,
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pub variables: Variables,
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pub document: Document,
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pub ctx_data: Arc<Data>,
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}
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#[doc(hidden)]
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#[derive(Clone)]
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pub struct QueryEnv(Arc<QueryEnvInner>);
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impl Deref for QueryEnv {
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type Target = QueryEnvInner;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl QueryEnv {
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#[doc(hidden)]
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pub fn new(
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extensions: Extensions,
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variables: Variables,
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document: Document,
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ctx_data: Arc<Data>,
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) -> QueryEnv {
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QueryEnv(Arc::new(QueryEnvInner {
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extensions,
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variables,
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document,
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ctx_data,
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}))
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}
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#[doc(hidden)]
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pub fn create_context<'a, T>(
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&'a self,
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schema_env: &'a SchemaEnv,
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path_node: Option<QueryPathNode<'a>>,
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item: T,
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inc_resolve_id: &'a AtomicUsize,
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defer_list: Option<&'a DeferList>,
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) -> ContextBase<'a, T> {
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ContextBase {
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path_node,
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resolve_id: ResolveId::root(),
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inc_resolve_id,
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item,
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schema_env,
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query_env: self,
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defer_list,
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}
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}
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}
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impl<'a, T> ContextBase<'a, T> {
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fn get_child_resolve_id(&self) -> ResolveId {
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let id = self
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.inc_resolve_id
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.fetch_add(1, std::sync::atomic::Ordering::Relaxed)
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+ 1;
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ResolveId {
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parent: Some(self.resolve_id.current),
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current: id,
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}
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}
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#[doc(hidden)]
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pub fn with_field(
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&'a self,
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field: &'a Positioned<Field>,
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) -> ContextBase<'a, &'a Positioned<Field>> {
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ContextBase {
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path_node: Some(QueryPathNode {
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parent: self.path_node.as_ref(),
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segment: QueryPathSegment::Name(
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field
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.alias
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.as_ref()
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.map(|alias| alias.as_str())
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.unwrap_or_else(|| field.name.as_str()),
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),
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}),
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item: field,
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resolve_id: self.get_child_resolve_id(),
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inc_resolve_id: self.inc_resolve_id,
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schema_env: self.schema_env,
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query_env: self.query_env,
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defer_list: self.defer_list,
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}
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}
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#[doc(hidden)]
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pub fn with_selection_set(
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&self,
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selection_set: &'a Positioned<SelectionSet>,
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) -> ContextBase<'a, &'a Positioned<SelectionSet>> {
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ContextBase {
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path_node: self.path_node.clone(),
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item: selection_set,
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resolve_id: self.resolve_id,
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inc_resolve_id: &self.inc_resolve_id,
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schema_env: self.schema_env,
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query_env: self.query_env,
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defer_list: self.defer_list,
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}
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}
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/// Gets the global data defined in the `Context` or `Schema`.
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///
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/// If both `Schema` and `Query` have the same data type, the data in the `Query` is obtained.
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///
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/// # Panics
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///
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/// It will panic if the specified data type does not exist.
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pub fn data<D: Any + Send + Sync>(&self) -> &D {
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self.data_opt::<D>()
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.expect("The specified data type does not exist.")
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}
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/// Gets the global data defined in the `Context` or `Schema`, returns `None` if the specified type data does not exist.
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pub fn data_opt<D: Any + Send + Sync>(&self) -> Option<&D> {
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self.query_env
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.ctx_data
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.0
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.get(&TypeId::of::<D>())
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.or_else(|| self.schema_env.data.0.get(&TypeId::of::<D>()))
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.and_then(|d| d.downcast_ref::<D>())
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}
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fn var_value(&self, name: &str, pos: Pos) -> Result<Value> {
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let def = self
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.query_env
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.document
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.current_operation()
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.variable_definitions
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.iter()
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.find(|def| def.name.node == name);
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if let Some(def) = def {
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if let Some(var_value) = self.query_env.variables.get(def.name.as_str()) {
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return Ok(var_value.clone());
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} else if let Some(default) = &def.default_value {
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return Ok(default.clone_inner());
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}
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}
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Err(QueryError::VarNotDefined {
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var_name: name.to_string(),
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}
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.into_error(pos))
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}
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fn resolve_input_value(&self, value: &mut Value, pos: Pos) -> Result<()> {
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match value {
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Value::Variable(var_name) => {
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*value = self.var_value(&var_name, pos)?;
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Ok(())
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}
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Value::List(ref mut ls) => {
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for value in ls {
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self.resolve_input_value(value, pos)?;
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}
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Ok(())
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}
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Value::Object(ref mut obj) => {
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for value in obj.values_mut() {
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self.resolve_input_value(value, pos)?;
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}
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Ok(())
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}
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_ => Ok(()),
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}
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}
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#[doc(hidden)]
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pub fn is_skip(&self, directives: &[Positioned<Directive>]) -> Result<bool> {
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for directive in directives {
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if directive.name.node == "skip" {
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if let Some(value) = directive.get_argument("if") {
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let mut inner_value = value.clone_inner();
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self.resolve_input_value(&mut inner_value, value.pos)?;
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match InputValueType::parse(Some(inner_value)) {
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Ok(true) => return Ok(true),
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Ok(false) => {}
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Err(err) => {
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return Err(err.into_error(value.pos, bool::qualified_type_name()))
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}
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}
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} else {
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return Err(QueryError::RequiredDirectiveArgs {
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directive: "@skip",
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arg_name: "if",
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arg_type: "Boolean!",
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}
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.into_error(directive.position()));
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}
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} else if directive.name.node == "include" {
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if let Some(value) = directive.get_argument("if") {
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let mut inner_value = value.clone_inner();
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self.resolve_input_value(&mut inner_value, value.pos)?;
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match InputValueType::parse(Some(inner_value)) {
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Ok(false) => return Ok(true),
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Ok(true) => {}
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Err(err) => {
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return Err(err.into_error(value.pos, bool::qualified_type_name()))
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}
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}
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} else {
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return Err(QueryError::RequiredDirectiveArgs {
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directive: "@include",
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arg_name: "if",
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arg_type: "Boolean!",
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}
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.into_error(directive.position()));
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}
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}
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}
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Ok(false)
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}
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#[doc(hidden)]
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pub fn is_defer(&self, directives: &[Positioned<Directive>]) -> bool {
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directives.iter().any(|d| d.name.node == "defer")
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}
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#[doc(hidden)]
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pub fn is_stream(&self, directives: &[Positioned<Directive>]) -> bool {
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directives.iter().any(|d| d.name.node == "stream")
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}
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}
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impl<'a> ContextBase<'a, &'a Positioned<SelectionSet>> {
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#[doc(hidden)]
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pub fn with_index(&'a self, idx: usize) -> ContextBase<'a, &'a Positioned<SelectionSet>> {
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ContextBase {
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path_node: Some(QueryPathNode {
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parent: self.path_node.as_ref(),
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segment: QueryPathSegment::Index(idx),
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}),
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item: self.item,
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resolve_id: self.get_child_resolve_id(),
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inc_resolve_id: self.inc_resolve_id,
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schema_env: self.schema_env,
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query_env: self.query_env,
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defer_list: self.defer_list,
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}
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}
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}
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impl<'a> ContextBase<'a, &'a Positioned<Field>> {
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#[doc(hidden)]
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pub fn param_value<T: InputValueType>(
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&self,
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name: &str,
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default: Option<fn() -> T>,
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) -> Result<T> {
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let value = self.get_argument(name).cloned();
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if let Some(default) = default {
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if value.is_none() {
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return Ok(default());
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}
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}
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let pos = value
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.as_ref()
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.map(|value| value.position())
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.unwrap_or_default();
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let value = match value {
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Some(value) => {
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let mut new_value = value.into_inner();
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self.resolve_input_value(&mut new_value, pos)?;
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Some(new_value)
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}
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None => None,
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};
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|
|
match InputValueType::parse(value) {
|
|
Ok(res) => Ok(res),
|
|
Err(err) => Err(err.into_error(pos, T::qualified_type_name())),
|
|
}
|
|
}
|
|
|
|
#[doc(hidden)]
|
|
pub fn result_name(&self) -> &str {
|
|
self.item
|
|
.alias
|
|
.as_ref()
|
|
.map(|alias| alias.as_str())
|
|
.unwrap_or_else(|| self.item.name.as_str())
|
|
}
|
|
|
|
/// Get the position of the current field in the query code.
|
|
pub fn position(&self) -> Pos {
|
|
self.pos
|
|
}
|
|
|
|
/// Creates a uniform interface to inspect the forthcoming selections.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```no_run
|
|
/// use async_graphql::*;
|
|
///
|
|
/// #[SimpleObject]
|
|
/// struct Detail {
|
|
/// c: i32,
|
|
/// d: i32,
|
|
/// }
|
|
///
|
|
/// #[SimpleObject]
|
|
/// struct MyObj {
|
|
/// a: i32,
|
|
/// b: i32,
|
|
/// #[field(ref)]
|
|
/// detail: Detail,
|
|
/// }
|
|
///
|
|
/// struct Query;
|
|
///
|
|
/// #[Object]
|
|
/// impl Query {
|
|
/// async fn obj(&self, ctx: &Context<'_>) -> MyObj {
|
|
/// if ctx.look_ahead().field("a").exists() {
|
|
/// // This is a query like `obj { a }`
|
|
/// } else if ctx.look_ahead().field("detail").field("c").exists() {
|
|
/// // This is a query like `obj { detail { c } }`
|
|
/// } else {
|
|
/// // This query doesn't have `a`
|
|
/// }
|
|
/// unimplemented!()
|
|
/// }
|
|
/// }
|
|
/// ```
|
|
pub fn look_ahead(&self) -> Lookahead {
|
|
Lookahead {
|
|
document: &self.query_env.document,
|
|
field: Some(&self.item.node),
|
|
}
|
|
}
|
|
}
|