685 lines
20 KiB
Rust
685 lines
20 KiB
Rust
//! Query context.
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use std::any::{Any, TypeId};
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use std::collections::{BTreeMap, HashMap};
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use std::convert::TryFrom;
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use std::fmt::{self, Debug, Display, Formatter};
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use std::ops::Deref;
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use std::sync::atomic::AtomicUsize;
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use std::sync::Arc;
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use async_graphql_value::Value as InputValue;
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use fnv::FnvHashMap;
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use serde::de::{Deserialize, Deserializer};
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use serde::ser::{SerializeSeq, Serializer};
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use serde::Serialize;
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use crate::extensions::Extensions;
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use crate::parser::types::{
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Directive, Field, FragmentDefinition, OperationDefinition, Selection, SelectionSet,
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};
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use crate::schema::SchemaEnv;
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use crate::{
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Error, InputType, Lookahead, Name, Pos, Positioned, Result, ServerError, ServerResult,
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UploadValue, Value,
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};
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/// Variables of a query.
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#[derive(Debug, Clone, Default, Serialize)]
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#[serde(transparent)]
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pub struct Variables(pub BTreeMap<Name, Value>);
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impl Display for Variables {
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fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
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f.write_str("{")?;
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for (i, (name, value)) in self.0.iter().enumerate() {
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write!(f, "{}{}: {}", if i == 0 { "" } else { ", " }, name, value)?;
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}
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f.write_str("}")
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}
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}
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impl<'de> Deserialize<'de> for Variables {
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fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
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Ok(Self(
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<Option<BTreeMap<Name, Value>>>::deserialize(deserializer)?.unwrap_or_default(),
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))
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}
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}
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impl Variables {
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/// Get the variables from a GraphQL value.
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///
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/// If the value is not a map, then no variables will be returned.
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#[must_use]
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pub fn from_value(value: Value) -> Self {
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match value {
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Value::Object(obj) => Self(obj),
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_ => Self::default(),
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}
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}
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/// Get the values from a JSON value.
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///
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/// If the value is not a map or the keys of a map are not valid GraphQL names, then no
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/// variables will be returned.
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#[must_use]
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pub fn from_json(value: serde_json::Value) -> Self {
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Value::from_json(value)
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.map(Self::from_value)
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.unwrap_or_default()
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}
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/// Get the variables as a GraphQL value.
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#[must_use]
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pub fn into_value(self) -> Value {
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Value::Object(self.0)
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}
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pub(crate) fn variable_path(&mut self, path: &str) -> Option<&mut Value> {
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let mut parts = path.strip_prefix("variables.")?.split('.');
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let initial = self.0.get_mut(parts.next().unwrap())?;
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parts.try_fold(initial, |current, part| match current {
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Value::List(list) => part
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.parse::<u32>()
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.ok()
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.and_then(|idx| usize::try_from(idx).ok())
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.and_then(move |idx| list.get_mut(idx)),
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Value::Object(obj) => obj.get_mut(part),
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_ => None,
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})
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}
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}
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impl From<Variables> for Value {
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fn from(variables: Variables) -> Self {
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variables.into_value()
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}
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}
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/// Schema/Context data.
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///
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/// This is a type map, allowing you to store anything inside it.
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#[derive(Default)]
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pub struct Data(FnvHashMap<TypeId, Box<dyn Any + Sync + Send>>);
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impl Deref for Data {
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type Target = FnvHashMap<TypeId, Box<dyn Any + Sync + Send>>;
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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 Data {
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/// Insert data.
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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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impl Debug for Data {
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fn fmt(&self, f: &mut Formatter) -> fmt::Result {
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f.debug_tuple("Data").finish()
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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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/// A segment in the path to the current query.
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///
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/// This is a borrowed form of [`PathSegment`](enum.PathSegment.html) used during execution instead
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/// of passed back when errors occur.
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#[derive(Debug, Clone, Copy, Serialize)]
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#[serde(untagged)]
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pub enum QueryPathSegment<'a> {
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/// We are currently resolving an element in a list.
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Index(usize),
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/// We are currently resolving a field in an object.
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Name(&'a str),
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}
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/// A path to the current query.
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///
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/// The path is stored as a kind of reverse linked list.
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#[derive(Debug, Clone, Copy)]
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pub struct QueryPathNode<'a> {
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/// The parent node to this, if there is one.
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pub parent: Option<&'a QueryPathNode<'a>>,
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/// The current path segment being resolved.
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pub segment: QueryPathSegment<'a>,
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}
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impl<'a> serde::Serialize for QueryPathNode<'a> {
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fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
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let mut seq = serializer.serialize_seq(None)?;
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self.try_for_each(|segment| seq.serialize_element(segment))?;
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seq.end()
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}
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}
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impl<'a> Display for QueryPathNode<'a> {
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fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
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let mut first = true;
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self.try_for_each(|segment| {
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if !first {
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write!(f, ".")?;
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}
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first = false;
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match segment {
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QueryPathSegment::Index(idx) => write!(f, "{}", *idx),
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QueryPathSegment::Name(name) => write!(f, "{}", name),
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}
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})
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}
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}
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impl<'a> QueryPathNode<'a> {
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/// Get the current field name.
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///
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/// This traverses all the parents of the node until it finds one that is a field name.
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pub fn field_name(&self) -> &str {
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std::iter::once(self)
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.chain(self.parents())
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.find_map(|node| match node.segment {
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QueryPathSegment::Name(name) => Some(name),
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QueryPathSegment::Index(_) => None,
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})
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.unwrap()
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}
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/// Get the path represented by `Vec<String>`; numbers will be stringified.
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#[must_use]
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pub fn to_string_vec(&self) -> Vec<String> {
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let mut res = Vec::new();
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self.for_each(|s| {
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res.push(match s {
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QueryPathSegment::Name(name) => (*name).to_string(),
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QueryPathSegment::Index(idx) => idx.to_string(),
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});
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});
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res
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}
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/// Iterate over the parents of the node.
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pub fn parents(&self) -> Parents<'_> {
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Parents(self)
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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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let _ = self.try_for_each::<std::convert::Infallible, _>(|segment| {
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f(segment);
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Ok(())
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});
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}
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pub(crate) fn try_for_each<E, F: FnMut(&QueryPathSegment<'a>) -> Result<(), E>>(
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&self,
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mut f: F,
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) -> Result<(), E> {
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self.try_for_each_ref(&mut f)
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}
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fn try_for_each_ref<E, F: FnMut(&QueryPathSegment<'a>) -> Result<(), E>>(
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&self,
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f: &mut F,
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) -> Result<(), E> {
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if let Some(parent) = &self.parent {
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parent.try_for_each_ref(f)?;
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}
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f(&self.segment)
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}
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}
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/// An iterator over the parents of a [`QueryPathNode`](struct.QueryPathNode.html).
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#[derive(Debug, Clone)]
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pub struct Parents<'a>(&'a QueryPathNode<'a>);
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impl<'a> Parents<'a> {
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/// Get the current query path node, which the next call to `next` will get the parents of.
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#[must_use]
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pub fn current(&self) -> &'a QueryPathNode<'a> {
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self.0
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}
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}
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impl<'a> Iterator for Parents<'a> {
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type Item = &'a QueryPathNode<'a>;
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fn next(&mut self) -> Option<Self::Item> {
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let parent = self.0.parent;
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if let Some(parent) = parent {
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self.0 = parent;
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}
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parent
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}
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}
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impl<'a> std::iter::FusedIterator for Parents<'a> {}
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/// The unique id of the current resolution.
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#[derive(Debug, Clone, Copy)]
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pub struct ResolveId {
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/// The unique ID of the parent resolution.
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pub parent: Option<usize>,
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/// The current unique id.
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pub current: usize,
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}
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impl ResolveId {
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#[doc(hidden)]
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pub 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 Display for ResolveId {
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fn fmt(&self, f: &mut Formatter<'_>) -> 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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/// Query context.
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///
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/// **This type is not stable and should not be used directly.**
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#[derive(Clone)]
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pub struct ContextBase<'a, T> {
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/// The current path node being resolved.
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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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#[doc(hidden)]
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pub schema_env: &'a SchemaEnv,
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#[doc(hidden)]
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pub query_env: &'a QueryEnv,
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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 operation: Positioned<OperationDefinition>,
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pub fragments: HashMap<Name, Positioned<FragmentDefinition>>,
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pub uploads: Vec<UploadValue>,
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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(inner: QueryEnvInner) -> QueryEnv {
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QueryEnv(Arc::new(inner))
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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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resolve_id: ResolveId,
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inc_resolve_id: &'a AtomicUsize,
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) -> ContextBase<'a, T> {
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ContextBase {
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path_node,
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resolve_id,
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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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}
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}
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}
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impl<'a, T> ContextBase<'a, T> {
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#[doc(hidden)]
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pub 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(&field.node.response_key().node),
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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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}
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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,
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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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}
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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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/// # Errors
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///
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/// Returns a `Error` if the specified type data does not exist.
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pub fn data<D: Any + Send + Sync>(&self) -> Result<&D> {
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self.data_opt::<D>().ok_or_else(|| {
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Error::new(format!(
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"Data `{}` does not exist.",
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std::any::type_name::<D>()
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))
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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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/// # 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_unchecked<D: Any + Send + Sync>(&self) -> &D {
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self.data_opt::<D>()
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.unwrap_or_else(|| panic!("Data `{}` does not exist.", std::any::type_name::<D>()))
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}
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/// Gets the global data defined in the `Context` or `Schema` or `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) -> ServerResult<Value> {
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self.query_env
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.operation
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.node
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.variable_definitions
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.iter()
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.find(|def| def.node.name.node == name)
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.and_then(|def| {
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self.query_env
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.variables
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.0
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.get(&def.node.name.node)
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.or_else(|| def.node.default_value())
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})
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.cloned()
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.ok_or_else(|| ServerError::new(format!("Variable {} is not defined.", name)).at(pos))
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}
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fn resolve_input_value(&self, value: Positioned<InputValue>) -> ServerResult<Value> {
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let pos = value.pos;
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value
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.node
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.into_const_with(|name| self.var_value(&name, pos))
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}
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#[doc(hidden)]
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pub fn is_ifdef(&self, directives: &[Positioned<Directive>]) -> bool {
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directives
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.iter()
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.any(|directive| directive.node.name.node == "ifdef")
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}
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#[doc(hidden)]
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pub fn is_skip(&self, directives: &[Positioned<Directive>]) -> ServerResult<bool> {
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for directive in directives {
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let include = match &*directive.node.name.node {
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"skip" => false,
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"include" => true,
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_ => continue,
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};
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let condition_input = directive
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.node
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.get_argument("if")
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.ok_or_else(|| ServerError::new(format!(r#"Directive @{} requires argument `if` of type `Boolean!` but it was not provided."#, if include { "include" } else { "skip" })).at(directive.pos))?
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.clone();
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let pos = condition_input.pos;
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let condition_input = self.resolve_input_value(condition_input)?;
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if include
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!= <bool as InputType>::parse(Some(condition_input))
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.map_err(|e| e.into_server_error().at(pos))?
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{
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return Ok(true);
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}
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}
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Ok(false)
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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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}
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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: InputType>(
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&self,
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name: &str,
|
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default: Option<fn() -> T>,
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) -> ServerResult<T> {
|
|
let value = self.item.node.get_argument(name).cloned();
|
|
if value.is_none() {
|
|
if let Some(default) = default {
|
|
return Ok(default());
|
|
}
|
|
}
|
|
let (pos, value) = match value {
|
|
Some(value) => (value.pos, Some(self.resolve_input_value(value)?)),
|
|
None => (Pos::default(), None),
|
|
};
|
|
InputType::parse(value).map_err(|e| e.into_server_error().at(pos))
|
|
}
|
|
|
|
/// Creates a uniform interface to inspect the forthcoming selections.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```no_run
|
|
/// use async_graphql::*;
|
|
///
|
|
/// #[derive(SimpleObject)]
|
|
/// struct Detail {
|
|
/// c: i32,
|
|
/// d: i32,
|
|
/// }
|
|
///
|
|
/// #[derive(SimpleObject)]
|
|
/// struct MyObj {
|
|
/// a: i32,
|
|
/// b: i32,
|
|
/// 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::new(&self.query_env.fragments, &self.item.node)
|
|
}
|
|
|
|
/// Get the current field.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```rust
|
|
/// use async_graphql::*;
|
|
///
|
|
/// #[derive(SimpleObject)]
|
|
/// struct MyObj {
|
|
/// a: i32,
|
|
/// b: i32,
|
|
/// c: i32,
|
|
/// }
|
|
///
|
|
/// pub struct Query;
|
|
///
|
|
/// #[Object]
|
|
/// impl Query {
|
|
/// async fn obj(&self, ctx: &Context<'_>) -> MyObj {
|
|
/// let fields = ctx.field().selection_set().map(|field| field.name()).collect::<Vec<_>>();
|
|
/// assert_eq!(fields, vec!["a", "b", "c"]);
|
|
/// MyObj { a: 1, b: 2, c: 3 }
|
|
/// }
|
|
/// }
|
|
///
|
|
/// async_std::task::block_on(async move {
|
|
/// let schema = Schema::new(Query, EmptyMutation, EmptySubscription);
|
|
/// assert!(schema.execute("{ obj { a b c }}").await.is_ok());
|
|
/// assert!(schema.execute("{ obj { a ... { b c } }}").await.is_ok());
|
|
/// assert!(schema.execute("{ obj { a ... BC }} fragment BC on MyObj { b c }").await.is_ok());
|
|
/// });
|
|
///
|
|
/// ```
|
|
pub fn field(&self) -> SelectionField<'a> {
|
|
SelectionField {
|
|
fragments: &self.query_env.fragments,
|
|
field: &self.item.node,
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Selection field.
|
|
pub struct SelectionField<'a> {
|
|
fragments: &'a HashMap<Name, Positioned<FragmentDefinition>>,
|
|
field: &'a Field,
|
|
}
|
|
|
|
impl<'a> SelectionField<'a> {
|
|
/// Get the name of this field.
|
|
pub fn name(&self) -> &'a str {
|
|
self.field.name.node.as_str()
|
|
}
|
|
|
|
/// Get all subfields of the current selection set.
|
|
pub fn selection_set(&self) -> impl Iterator<Item = SelectionField<'a>> {
|
|
SelectionFieldsIter {
|
|
fragments: self.fragments,
|
|
iter: vec![self.field.selection_set.node.items.iter()],
|
|
}
|
|
}
|
|
}
|
|
|
|
struct SelectionFieldsIter<'a> {
|
|
fragments: &'a HashMap<Name, Positioned<FragmentDefinition>>,
|
|
iter: Vec<std::slice::Iter<'a, Positioned<Selection>>>,
|
|
}
|
|
|
|
impl<'a> Iterator for SelectionFieldsIter<'a> {
|
|
type Item = SelectionField<'a>;
|
|
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
loop {
|
|
let it = self.iter.last_mut()?;
|
|
match it.next() {
|
|
Some(selection) => match &selection.node {
|
|
Selection::Field(field) => {
|
|
return Some(SelectionField {
|
|
fragments: self.fragments,
|
|
field: &field.node,
|
|
});
|
|
}
|
|
Selection::FragmentSpread(fragment_spread) => {
|
|
if let Some(fragment) =
|
|
self.fragments.get(&fragment_spread.node.fragment_name.node)
|
|
{
|
|
self.iter
|
|
.push(fragment.node.selection_set.node.items.iter());
|
|
}
|
|
}
|
|
Selection::InlineFragment(inline_fragment) => {
|
|
self.iter
|
|
.push(inline_fragment.node.selection_set.node.items.iter());
|
|
}
|
|
},
|
|
None => {
|
|
self.iter.pop();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|