530 lines
16 KiB
Rust
530 lines
16 KiB
Rust
use crate::extensions::BoxExtension;
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use crate::parser::ast::{Directive, Field, FragmentDefinition, SelectionSet, VariableDefinition};
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use crate::registry::Registry;
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use crate::{InputValueType, QueryError, Result, Schema, Type};
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use crate::{Pos, Positioned, Value};
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use fnv::FnvHashMap;
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use std::any::{Any, TypeId};
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use std::collections::{BTreeMap, HashMap};
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use std::ops::{Deref, DerefMut};
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use std::path::Path;
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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: &str,
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content_type: Option<&str>,
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path: &Path,
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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::String(file_string(filename, content_type, path));
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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::String(file_string(filename, content_type, path));
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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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fn file_string(filename: &str, content_type: Option<&str>, path: &Path) -> String {
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if let Some(content_type) = content_type {
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format!("file:{}:{}|", filename, content_type) + &path.display().to_string()
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} else {
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format!("file:{}|", filename) + &path.display().to_string()
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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) -> 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.into()
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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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/// 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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pub(crate) extensions: &'a [BoxExtension],
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pub(crate) item: T,
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pub(crate) variables: &'a Variables,
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pub(crate) variable_definitions: &'a [Positioned<VariableDefinition>],
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pub(crate) registry: &'a Registry,
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pub(crate) data: &'a Data,
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pub(crate) ctx_data: Option<&'a Data>,
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pub(crate) fragments: &'a HashMap<String, FragmentDefinition>,
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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 Environment {
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pub variables: Variables,
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pub variable_definitions: Vec<Positioned<VariableDefinition>>,
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pub fragments: HashMap<String, FragmentDefinition>,
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pub ctx_data: Arc<Data>,
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}
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impl Environment {
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#[doc(hidden)]
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pub fn create_context<'a, T, Query, Mutation, Subscription>(
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&'a self,
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schema: &'a Schema<Query, Mutation, Subscription>,
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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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) -> 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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extensions: &[],
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item,
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variables: &self.variables,
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variable_definitions: &self.variable_definitions,
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registry: &schema.0.registry,
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data: &schema.0.data,
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ctx_data: Some(&self.ctx_data),
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fragments: &self.fragments,
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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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extensions: self.extensions,
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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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variables: self.variables,
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variable_definitions: self.variable_definitions,
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registry: self.registry,
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data: self.data,
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ctx_data: self.ctx_data,
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fragments: self.fragments,
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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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extensions: self.extensions,
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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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variables: self.variables,
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variable_definitions: self.variable_definitions,
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registry: self.registry,
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data: self.data,
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ctx_data: self.ctx_data,
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fragments: self.fragments,
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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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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.ctx_data
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.and_then(|ctx_data| ctx_data.0.get(&TypeId::of::<D>()))
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.or_else(|| self.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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.variable_definitions
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.iter()
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.find(|def| def.name.as_str() == name);
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if let Some(def) = def {
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if let Some(var_value) = self.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, mut value: Value, pos: Pos) -> Result<Value> {
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match value {
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Value::Variable(var_name) => self.var_value(&var_name, pos),
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Value::List(ref mut ls) => {
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for value in ls {
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if let Value::Variable(var_name) = value {
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*value = self.var_value(&var_name, pos)?;
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}
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}
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Ok(value)
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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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if let Value::Variable(var_name) = value {
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*value = self.var_value(&var_name, pos)?;
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}
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}
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Ok(value)
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}
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_ => Ok(value),
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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.as_str() == "skip" {
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if let Some(value) = directive.get_argument("if") {
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let value = self.resolve_input_value(value.clone_inner(), value.position())?;
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let res: bool = InputValueType::parse(&value).ok_or_else(|| {
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QueryError::ExpectedType {
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expect: bool::qualified_type_name(),
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actual: value,
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}
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.into_error(directive.position())
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})?;
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if res {
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return Ok(true);
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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.as_str() == "include" {
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if let Some(value) = directive.get_argument("if") {
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let value = self.resolve_input_value(value.clone_inner(), value.position())?;
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let res: bool = InputValueType::parse(&value).ok_or_else(|| {
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QueryError::ExpectedType {
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expect: bool::qualified_type_name(),
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actual: value,
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}
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.into_error(directive.position())
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})?;
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if !res {
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return Ok(true);
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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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} else {
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return Err(QueryError::UnknownDirective {
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name: directive.name.clone_inner(),
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}
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.into_error(directive.position()));
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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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extensions: self.extensions,
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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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variables: self.variables,
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variable_definitions: self.variable_definitions,
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registry: self.registry,
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data: self.data,
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ctx_data: self.ctx_data,
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fragments: self.fragments,
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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, F: FnOnce() -> Value>(
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&self,
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name: &str,
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default: F,
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) -> Result<T> {
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match self.get_argument(name).cloned() {
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Some(value) => {
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let pos = value.position();
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let value = self.resolve_input_value(value.into_inner(), pos)?;
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let res = InputValueType::parse(&value).ok_or_else(|| {
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QueryError::ExpectedType {
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expect: T::qualified_type_name(),
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actual: value,
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}
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.into_error(pos)
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})?;
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Ok(res)
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}
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None => {
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let value = default();
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let res = InputValueType::parse(&value).ok_or_else(|| {
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QueryError::ExpectedType {
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expect: T::qualified_type_name(),
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actual: value.clone(),
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}
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.into_error(self.position())
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})?;
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Ok(res)
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}
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}
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}
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#[doc(hidden)]
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pub fn result_name(&self) -> &str {
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self.item
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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(|| self.item.name.as_str())
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}
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}
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