625 lines
18 KiB
Rust
625 lines
18 KiB
Rust
use crate::validators::InputValueValidator;
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use crate::{model, Any, Type as _, Value};
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use graphql_parser::query::Type as ParsedType;
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use std::collections::{HashMap, HashSet};
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use std::fmt::Write;
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use std::sync::Arc;
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fn parse_non_null(type_name: &str) -> Option<&str> {
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if type_name.ends_with('!') {
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Some(&type_name[..type_name.len() - 1])
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} else {
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None
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}
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}
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fn parse_list(type_name: &str) -> Option<&str> {
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if type_name.starts_with('[') {
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Some(&type_name[1..type_name.len() - 1])
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} else {
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None
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}
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}
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#[derive(Clone, Copy, PartialEq, Debug)]
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pub enum TypeName<'a> {
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List(&'a str),
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NonNull(&'a str),
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Named(&'a str),
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}
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impl<'a> std::fmt::Display for TypeName<'a> {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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match self {
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TypeName::Named(name) => write!(f, "{}", name),
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TypeName::NonNull(name) => write!(f, "{}!", name),
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TypeName::List(name) => write!(f, "[{}]", name),
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}
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}
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}
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impl<'a> TypeName<'a> {
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pub fn create(type_name: &str) -> TypeName {
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if let Some(type_name) = parse_non_null(type_name) {
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TypeName::NonNull(type_name)
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} else if let Some(type_name) = parse_list(type_name) {
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TypeName::List(type_name)
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} else {
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TypeName::Named(type_name)
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}
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}
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pub fn concrete_typename(type_name: &str) -> &str {
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match TypeName::create(type_name) {
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TypeName::List(type_name) => Self::concrete_typename(type_name),
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TypeName::NonNull(type_name) => Self::concrete_typename(type_name),
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TypeName::Named(type_name) => type_name,
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}
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}
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pub fn is_non_null(&self) -> bool {
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if let TypeName::NonNull(_) = self {
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true
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} else {
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false
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}
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}
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pub fn unwrap_non_null(&self) -> Self {
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match self {
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TypeName::NonNull(ty) => TypeName::create(ty),
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_ => *self,
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}
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}
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pub fn is_subtype(&self, sub: &TypeName<'_>) -> bool {
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match (self, sub) {
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(TypeName::NonNull(super_type), TypeName::NonNull(sub_type))
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| (TypeName::Named(super_type), TypeName::NonNull(sub_type)) => {
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TypeName::create(super_type).is_subtype(&TypeName::create(sub_type))
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}
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(TypeName::Named(super_type), TypeName::Named(sub_type)) => super_type == sub_type,
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(TypeName::List(super_type), TypeName::List(sub_type)) => {
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TypeName::create(super_type).is_subtype(&TypeName::create(sub_type))
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}
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_ => false,
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}
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}
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}
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#[derive(Clone)]
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pub struct InputValue {
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pub name: &'static str,
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pub description: Option<&'static str>,
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pub ty: String,
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pub default_value: Option<&'static str>,
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pub validator: Option<Arc<dyn InputValueValidator>>,
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}
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#[derive(Clone)]
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pub struct Field {
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pub name: String,
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pub description: Option<&'static str>,
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pub args: HashMap<&'static str, InputValue>,
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pub ty: String,
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pub deprecation: Option<&'static str>,
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pub cache_control: CacheControl,
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pub external: bool,
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pub requires: Option<&'static str>,
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pub provides: Option<&'static str>,
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}
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#[derive(Clone)]
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pub struct EnumValue {
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pub name: &'static str,
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pub description: Option<&'static str>,
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pub deprecation: Option<&'static str>,
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}
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/// Cache control values
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///
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/// # Examples
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///
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/// ```rust
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/// use async_graphql::*;
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///
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/// struct QueryRoot;
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///
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/// #[Object(cache_control(max_age = 60))]
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/// impl QueryRoot {
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/// #[field(cache_control(max_age = 30))]
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/// async fn value1(&self) -> i32 {
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/// 0
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/// }
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///
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/// #[field(cache_control(private))]
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/// async fn value2(&self) -> i32 {
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/// 0
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/// }
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/// }
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///
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/// #[async_std::main]
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/// async fn main() {
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/// let schema = Schema::new(QueryRoot, EmptyMutation, EmptySubscription);
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/// assert_eq!(schema.execute("{ value1 }").await.unwrap().cache_control, CacheControl { public: true, max_age: 30 });
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/// assert_eq!(schema.execute("{ value2 }").await.unwrap().cache_control, CacheControl { public: false, max_age: 60 });
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/// assert_eq!(schema.execute("{ value1 value2 }").await.unwrap().cache_control, CacheControl { public: false, max_age: 30 });
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/// }
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/// ```
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#[derive(Clone, Copy, PartialEq, Eq, Debug)]
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pub struct CacheControl {
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/// Scope is public, default is true
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pub public: bool,
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/// Cache max age, default is 0.
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pub max_age: usize,
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}
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impl Default for CacheControl {
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fn default() -> Self {
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Self {
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public: true,
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max_age: 0,
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}
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}
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}
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impl CacheControl {
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/// Get 'Cache-Control' header value.
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pub fn value(&self) -> Option<String> {
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if self.max_age > 0 {
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if !self.public {
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Some(format!("max-age={}, private", self.max_age))
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} else {
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Some(format!("max-age={}", self.max_age))
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}
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} else {
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None
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}
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}
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}
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impl CacheControl {
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pub(crate) fn merge(&mut self, other: &CacheControl) {
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self.public = self.public && other.public;
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self.max_age = if self.max_age == 0 {
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other.max_age
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} else if other.max_age == 0 {
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self.max_age
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} else {
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self.max_age.min(other.max_age)
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};
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}
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}
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pub enum Type {
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Scalar {
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name: String,
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description: Option<&'static str>,
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is_valid: fn(value: &Value) -> bool,
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},
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Object {
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name: String,
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description: Option<&'static str>,
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fields: HashMap<String, Field>,
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cache_control: CacheControl,
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extends: bool,
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keys: Option<Vec<String>>,
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},
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Interface {
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name: String,
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description: Option<&'static str>,
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fields: HashMap<String, Field>,
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possible_types: HashSet<String>,
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extends: bool,
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keys: Option<Vec<String>>,
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},
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Union {
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name: String,
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description: Option<&'static str>,
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possible_types: HashSet<String>,
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},
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Enum {
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name: String,
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description: Option<&'static str>,
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enum_values: HashMap<&'static str, EnumValue>,
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},
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InputObject {
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name: String,
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description: Option<&'static str>,
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input_fields: HashMap<String, InputValue>,
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},
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}
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impl Type {
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pub fn field_by_name(&self, name: &str) -> Option<&Field> {
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self.fields().and_then(|fields| fields.get(name))
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}
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pub fn fields(&self) -> Option<&HashMap<String, Field>> {
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match self {
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Type::Object { fields, .. } => Some(&fields),
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Type::Interface { fields, .. } => Some(&fields),
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_ => None,
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}
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}
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pub fn name(&self) -> &str {
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match self {
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Type::Scalar { name, .. } => &name,
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Type::Object { name, .. } => name,
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Type::Interface { name, .. } => name,
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Type::Union { name, .. } => name,
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Type::Enum { name, .. } => name,
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Type::InputObject { name, .. } => name,
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}
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}
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pub fn is_composite(&self) -> bool {
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match self {
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Type::Object { .. } => true,
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Type::Interface { .. } => true,
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Type::Union { .. } => true,
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_ => false,
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}
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}
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pub fn is_abstract(&self) -> bool {
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match self {
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Type::Interface { .. } => true,
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Type::Union { .. } => true,
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_ => false,
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}
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}
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pub fn is_leaf(&self) -> bool {
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match self {
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Type::Enum { .. } => true,
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Type::Scalar { .. } => true,
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_ => false,
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}
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}
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pub fn is_input(&self) -> bool {
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match self {
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Type::Enum { .. } => true,
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Type::Scalar { .. } => true,
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Type::InputObject { .. } => true,
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_ => false,
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}
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}
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pub fn is_possible_type(&self, type_name: &str) -> bool {
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match self {
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Type::Interface { possible_types, .. } => possible_types.contains(type_name),
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Type::Union { possible_types, .. } => possible_types.contains(type_name),
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Type::Object { name, .. } => name == type_name,
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_ => false,
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}
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}
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pub fn possible_types(&self) -> Option<&HashSet<String>> {
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match self {
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Type::Interface { possible_types, .. } => Some(possible_types),
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Type::Union { possible_types, .. } => Some(possible_types),
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_ => None,
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}
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}
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pub fn type_overlap(&self, ty: &Type) -> bool {
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if self as *const Type == ty as *const Type {
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return true;
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}
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match (self.is_abstract(), ty.is_abstract()) {
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(true, true) => self
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.possible_types()
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.iter()
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.copied()
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.flatten()
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.any(|type_name| ty.is_possible_type(type_name)),
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(true, false) => self.is_possible_type(ty.name()),
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(false, true) => ty.is_possible_type(self.name()),
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(false, false) => false,
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}
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}
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}
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pub struct Directive {
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pub name: &'static str,
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pub description: Option<&'static str>,
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pub locations: Vec<model::__DirectiveLocation>,
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pub args: HashMap<&'static str, InputValue>,
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}
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pub struct Registry {
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pub types: HashMap<String, Type>,
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pub directives: HashMap<String, Directive>,
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pub implements: HashMap<String, HashSet<String>>,
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pub query_type: String,
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pub mutation_type: Option<String>,
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pub subscription_type: Option<String>,
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}
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impl Registry {
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pub fn create_type<T: crate::Type, F: FnMut(&mut Registry) -> Type>(
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&mut self,
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mut f: F,
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) -> String {
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let name = T::type_name();
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if !self.types.contains_key(name.as_ref()) {
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self.types.insert(
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name.to_string(),
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Type::Object {
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name: "".to_string(),
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description: None,
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fields: Default::default(),
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cache_control: Default::default(),
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extends: false,
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keys: None,
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},
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);
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let ty = f(self);
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self.types.insert(name.to_string(), ty);
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}
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T::qualified_type_name()
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}
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pub fn add_directive(&mut self, directive: Directive) {
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self.directives
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.insert(directive.name.to_string(), directive);
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}
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pub fn add_implements(&mut self, ty: &str, interface: &str) {
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self.implements
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.entry(ty.to_string())
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.and_modify(|interfaces| {
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interfaces.insert(interface.to_string());
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})
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.or_insert({
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let mut interfaces = HashSet::new();
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interfaces.insert(interface.to_string());
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interfaces
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});
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}
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pub fn add_keys(&mut self, ty: &str, keys: &str) {
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let all_keys = match self.types.get_mut(ty) {
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Some(Type::Object { keys: all_keys, .. }) => all_keys,
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Some(Type::Interface { keys: all_keys, .. }) => all_keys,
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_ => return,
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};
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if let Some(all_keys) = all_keys {
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all_keys.push(keys.to_string());
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} else {
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*all_keys = Some(vec![keys.to_string()]);
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}
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}
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pub fn concrete_type_by_name(&self, type_name: &str) -> Option<&Type> {
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self.types.get(TypeName::concrete_typename(type_name))
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}
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pub fn concrete_type_by_parsed_type(&self, query_type: &ParsedType) -> Option<&Type> {
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match query_type {
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ParsedType::NonNullType(ty) => self.concrete_type_by_parsed_type(ty),
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ParsedType::ListType(ty) => self.concrete_type_by_parsed_type(ty),
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ParsedType::NamedType(name) => self.types.get(name.as_str()),
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}
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}
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fn create_federation_fields<'a, I: Iterator<Item = &'a Field>>(sdl: &mut String, it: I) {
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for field in it {
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if field.name.starts_with("__") {
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continue;
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}
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if field.name == "_service" || field.name == "_entities" {
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continue;
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}
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write!(sdl, "\t{}: {}", field.name, field.ty).ok();
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if field.external {
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write!(sdl, " @external").ok();
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}
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if let Some(requires) = field.requires {
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write!(sdl, " @requires(fields: \"{}\")", requires).ok();
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}
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if let Some(provides) = field.provides {
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write!(sdl, " @provides(fields: \"{}\")", provides).ok();
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}
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writeln!(sdl).ok();
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}
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}
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fn create_federation_type(&self, ty: &Type, sdl: &mut String) {
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match ty {
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Type::Object {
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name,
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fields,
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extends,
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keys,
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..
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} => {
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if name.starts_with("__") {
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return;
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}
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if name == "_Service" {
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return;
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}
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if fields.len() == 4 {
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// Is empty query root, only __schema, __type, _service, _entities fields
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return;
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}
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if *extends {
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write!(sdl, "extend ").ok();
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}
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write!(sdl, "type {} ", name).ok();
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if let Some(keys) = keys {
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for key in keys {
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write!(sdl, "@key(fields: \"{}\") ", key).ok();
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}
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}
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writeln!(sdl, "{{").ok();
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Self::create_federation_fields(sdl, fields.values());
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writeln!(sdl, "}}").ok();
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}
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Type::Interface {
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name,
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fields,
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extends,
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keys,
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..
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} => {
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if *extends {
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write!(sdl, "extend ").ok();
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}
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write!(sdl, "interface {} ", name).ok();
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if let Some(keys) = keys {
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for key in keys {
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write!(sdl, "@key(fields: \"{}\") ", key).ok();
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}
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}
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writeln!(sdl, "{{").ok();
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Self::create_federation_fields(sdl, fields.values());
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writeln!(sdl, "}}").ok();
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}
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_ => {}
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}
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}
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pub fn create_federation_sdl(&self) -> String {
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let mut sdl = String::new();
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for ty in self.types.values() {
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self.create_federation_type(ty, &mut sdl);
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}
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sdl
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}
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fn has_entities(&self) -> bool {
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self.types.values().any(|ty| match ty {
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Type::Object {
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keys: Some(keys), ..
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} => !keys.is_empty(),
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Type::Interface {
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keys: Some(keys), ..
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} => !keys.is_empty(),
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_ => false,
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})
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}
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fn create_entity_type(&mut self) {
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let possible_types = self
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.types
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.values()
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.filter_map(|ty| match ty {
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Type::Object {
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name,
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keys: Some(keys),
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..
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} if !keys.is_empty() => Some(name.clone()),
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Type::Interface {
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name,
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keys: Some(keys),
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..
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} if !keys.is_empty() => Some(name.clone()),
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_ => None,
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})
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.collect();
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self.types.insert(
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"_Entity".to_string(),
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Type::Union {
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name: "_Entity".to_string(),
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description: None,
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possible_types,
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},
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);
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}
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|
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pub fn create_federation_types(&mut self) {
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if !self.has_entities() {
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return;
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}
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Any::create_type_info(self);
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self.types.insert(
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"_Service".to_string(),
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Type::Object {
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name: "_Service".to_string(),
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description: None,
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fields: {
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let mut fields = HashMap::new();
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fields.insert(
|
|
"sdl".to_string(),
|
|
Field {
|
|
name: "sdl".to_string(),
|
|
description: None,
|
|
args: Default::default(),
|
|
ty: "String".to_string(),
|
|
deprecation: None,
|
|
cache_control: Default::default(),
|
|
external: false,
|
|
requires: None,
|
|
provides: None,
|
|
},
|
|
);
|
|
fields
|
|
},
|
|
cache_control: Default::default(),
|
|
extends: false,
|
|
keys: None,
|
|
},
|
|
);
|
|
|
|
self.create_entity_type();
|
|
|
|
let query_root = self.types.get_mut(&self.query_type).unwrap();
|
|
if let Type::Object { fields, .. } = query_root {
|
|
fields.insert(
|
|
"_service".to_string(),
|
|
Field {
|
|
name: "_service".to_string(),
|
|
description: None,
|
|
args: Default::default(),
|
|
ty: "_Service!".to_string(),
|
|
deprecation: None,
|
|
cache_control: Default::default(),
|
|
external: false,
|
|
requires: None,
|
|
provides: None,
|
|
},
|
|
);
|
|
|
|
fields.insert(
|
|
"_entities".to_string(),
|
|
Field {
|
|
name: "_entities".to_string(),
|
|
description: None,
|
|
args: {
|
|
let mut args = HashMap::new();
|
|
args.insert(
|
|
"representations",
|
|
InputValue {
|
|
name: "representations",
|
|
description: None,
|
|
ty: "[_Any!]!".to_string(),
|
|
default_value: None,
|
|
validator: None,
|
|
},
|
|
);
|
|
args
|
|
},
|
|
ty: "[_Entity]!".to_string(),
|
|
deprecation: None,
|
|
cache_control: Default::default(),
|
|
external: false,
|
|
requires: None,
|
|
provides: None,
|
|
},
|
|
);
|
|
}
|
|
}
|
|
}
|