525 lines
15 KiB
Rust
525 lines
15 KiB
Rust
use crate::extensions::Extensions;
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use crate::parser::types::{
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Directive, Field, FragmentDefinition, OperationDefinition, SelectionSet,
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};
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use crate::schema::SchemaEnv;
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use crate::{
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Error, InputValueType, Lookahead, Pos, Positioned, Result, ServerError, ServerResult,
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UploadValue, Value,
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};
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use async_graphql_value::{Name, Value as InputValue};
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use fnv::FnvHashMap;
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use serde::ser::{SerializeSeq, Serializer};
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use serde::{Deserialize, Serialize};
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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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/// Variables of a query.
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#[derive(Debug, Clone, Default, Deserialize, 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 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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/// 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> 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.for_each(|segment| match segment {
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QueryPathSegment::Index(idx) => {
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seq.serialize_element(&idx).ok();
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}
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QueryPathSegment::Name(name) => {
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seq.serialize_element(name).ok();
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}
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});
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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.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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/// Get the current field name.
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pub 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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/// Get the path represented by `Vec<String>`.
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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| match s {
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QueryPathSegment::Index(idx) => res.push(format!("{}", idx)),
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QueryPathSegment::Name(name) => res.push(name.to_string()),
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});
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res
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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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}
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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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#[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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#[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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#[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.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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}
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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 InputValueType>::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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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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) -> ServerResult<T> {
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let value = self.item.node.get_argument(name).cloned();
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if value.is_none() {
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if let Some(default) = default {
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return Ok(default());
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}
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}
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let (pos, value) = match value {
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Some(value) => (value.pos, Some(self.resolve_input_value(value)?)),
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None => (Pos::default(), None),
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};
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InputValueType::parse(value).map_err(|e| e.into_server_error().at(pos))
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}
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/// Creates a uniform interface to inspect the forthcoming selections.
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///
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/// # Examples
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///
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/// ```no_run
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/// use async_graphql::*;
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///
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/// #[derive(SimpleObject)]
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/// struct Detail {
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/// c: i32,
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/// d: i32,
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/// }
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///
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/// #[derive(SimpleObject)]
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/// struct MyObj {
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/// a: i32,
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/// b: i32,
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/// detail: Detail,
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/// }
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///
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/// struct Query;
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///
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/// #[Object]
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/// impl Query {
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/// async fn obj(&self, ctx: &Context<'_>) -> MyObj {
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/// if ctx.look_ahead().field("a").exists() {
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/// // This is a query like `obj { a }`
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/// } else if ctx.look_ahead().field("detail").field("c").exists() {
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/// // This is a query like `obj { detail { c } }`
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/// } else {
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/// // This query doesn't have `a`
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/// }
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/// unimplemented!()
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/// }
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/// }
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/// ```
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pub fn look_ahead(&self) -> Lookahead {
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Lookahead::new(&self.query_env.fragments, &self.item.node)
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}
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}
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