655 lines
21 KiB
Rust
655 lines
21 KiB
Rust
//! # The GraphQL server library implemented by rust
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//!
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//! <div align="center">
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//! <!-- CI -->
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//! <img src="https://github.com/async-graphql/async-graphql/workflows/CI/badge.svg" />
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//! <!-- codecov -->
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// <img src="https://codecov.io/gh/async-graphql/async-graphql/branch/master/graph/badge.svg" />
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//! <!-- Crates version -->
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//! <a href="https://crates.io/crates/async-graphql">
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//! <img src="https://img.shields.io/crates/v/async-graphql.svg?style=flat-square"
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//! alt="Crates.io version" />
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//! </a>
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//! <!-- Downloads -->
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//! <a href="https://crates.io/crates/async-graphql">
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//! <img src="https://img.shields.io/crates/d/async-graphql.svg?style=flat-square"
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//! alt="Download" />
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//! </a>
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//! <!-- docs.rs docs -->
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//! <a href="https://docs.rs/async-graphql">
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//! <img src="https://img.shields.io/badge/docs-latest-blue.svg?style=flat-square"
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//! alt="docs.rs docs" />
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//! </a>
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//! </div>
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//!
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//! ## Documentation
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//!
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//! * [Feature Comparison](feature-comparison.md)
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//! * [Book](https://async-graphql.github.io/async-graphql/en/index.html)
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//! * [中文文档](https://async-graphql.github.io/async-graphql/zh-CN/index.html)
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//! * [Docs](https://docs.rs/async-graphql)
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//! * [GitHub repository](https://github.com/async-graphql/async-graphql)
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//! * [Cargo package](https://crates.io/crates/async-graphql)
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//! * Minimum supported Rust version: 1.42 or later
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//!
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//! ## Features
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//!
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//! * Fully support async/await
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//! * Type safety
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//! * Rustfmt friendly (Procedural Macro)
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//! * Custom scalar
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//! * Minimal overhead
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//! * Easy integration (hyper, actix_web, tide ...)
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//! * Upload files (Multipart request)
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//! * Subscription (WebSocket transport)
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//! * Custom extension
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//! * Apollo Tracing extension
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//! * Limit query complexity/depth
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//! * Error Extensions
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//! * Apollo Federation
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//!
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//! ## Integrations
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//!
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//! * Actix-web [async-graphql-actix_web](https://crates.io/crates/async-graphql-actix-web)
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//! * Warp [async-graphql-warp](https://crates.io/crates/async-graphql-warp)
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//! * Tide [async-graphql-tide](https://crates.io/crates/async-graphql-tide)
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//!
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//! ## License
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//!
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//! Licensed under either of
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//!
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//! * Apache License, Version 2.0,
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//! (./LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
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//! * MIT license (./LICENSE-MIT or http://opensource.org/licenses/MIT)
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//! at your option.
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//!
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//! ## References
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//!
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//! * [GraphQL](https://graphql.org)
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//! * [GraphQL Multipart Request](https://github.com/jaydenseric/graphql-multipart-request-spec)
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//! * [GraphQL Cursor Connections Specification](https://facebook.github.io/relay/graphql/connections.htm)
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//! * [GraphQL over WebSocket Protocol](https://github.com/apollographql/subscriptions-transport-ws/blob/master/PROTOCOL.md)
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//! * [Apollo Tracing](https://github.com/apollographql/apollo-tracing)
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//! * [Apollo Federation](https://www.apollographql.com/docs/apollo-server/federation/introduction)
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#![warn(missing_docs)]
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#![allow(clippy::needless_doctest_main)]
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#![allow(clippy::needless_lifetimes)]
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#[macro_use]
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extern crate thiserror;
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#[macro_use]
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extern crate serde_derive;
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mod base;
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mod context;
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mod error;
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mod model;
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mod mutation_resolver;
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mod query;
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mod resolver;
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mod scalars;
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mod schema;
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mod subscription;
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mod types;
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mod validation;
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pub mod extensions;
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pub mod guard;
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pub mod validators;
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use async_graphql_parser as parser;
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#[doc(hidden)]
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pub use anyhow;
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#[doc(hidden)]
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pub use async_trait;
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#[doc(hidden)]
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pub use futures;
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#[doc(hidden)]
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pub use serde_json;
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pub mod http;
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pub use base::{ScalarType, Type};
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pub use context::{
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Context, ContextBase, Data, Environment, QueryPathNode, QueryPathSegment, Variables,
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};
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pub use error::{
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Error, ErrorExtensions, FieldError, FieldResult, InputValueError, InputValueResult,
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ParseRequestError, QueryError, ResultExt,
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};
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pub use parser::{Pos, Positioned, Value};
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pub use query::{IntoQueryBuilder, IntoQueryBuilderOpts, QueryBuilder, QueryResponse};
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pub use registry::CacheControl;
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pub use scalars::{Any, Json, ID};
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pub use schema::Schema;
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pub use subscription::{
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SimpleBroker, SubscriptionStream, SubscriptionStreams, SubscriptionTransport,
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WebSocketTransport,
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};
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pub use types::{
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Connection, Cursor, DataSource, EmptyEdgeFields, EmptyMutation, EmptySubscription, PageInfo,
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QueryOperation, Upload,
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};
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pub use validation::ValidationMode;
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/// Result type
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pub type Result<T> = std::result::Result<T, Error>;
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// internal types
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#[doc(hidden)]
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pub use context::ContextSelectionSet;
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#[doc(hidden)]
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pub mod registry;
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#[doc(hidden)]
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pub use base::{BoxFieldFuture, InputObjectType, InputValueType, ObjectType, OutputValueType};
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#[doc(hidden)]
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pub use resolver::{collect_fields, do_resolve};
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#[doc(hidden)]
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pub use subscription::SubscriptionType;
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#[doc(hidden)]
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pub use types::{EnumItem, EnumType};
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/// Define a GraphQL object
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///
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/// # Macro parameters
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///
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/// | Attribute | description | Type | Optional |
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/// |---------------|---------------------------|----------|----------|
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/// | name | Object name | string | Y |
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/// | desc | Object description | string | Y |
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/// | cache_control | Object cache control | [`CacheControl`](struct.CacheControl.html) | Y |
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/// | extends | Add fields to an entity that's defined in another service | bool | Y |
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///
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/// # Field parameters
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///
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/// | Attribute | description | Type | Optional |
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/// |---------------|---------------------------|----------|----------|
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/// | name | Field name | string | Y |
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/// | desc | Field description | string | Y |
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/// | deprecation | Field deprecation reason | string | Y |
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/// | cache_control | Field cache control | [`CacheControl`](struct.CacheControl.html) | Y |
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/// | external | Mark a field as owned by another service. This allows service A to use fields from service B while also knowing at runtime the types of that field. | bool | Y |
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/// | provides | Annotate the expected returned fieldset from a field on a base type that is guaranteed to be selectable by the gateway. | string | Y |
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/// | requires | Annotate the required input fieldset from a base type for a resolver. It is used to develop a query plan where the required fields may not be needed by the client, but the service may need additional information from other services. | string | Y |
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/// | guard | Field of guard | [`Guard`](guard/trait.Guard.html) | Y |
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///
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/// # Field argument parameters
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///
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/// | Attribute | description | Type | Optional |
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/// |-------------|---------------------------|----------|----------|
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/// | name | Argument name | string | Y |
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/// | desc | Argument description | string | Y |
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/// | default | Argument default value | string | Y |
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/// | validator | Input value validator | [`InputValueValidator`](validators/trait.InputValueValidator.html) | Y |
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///
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/// # The field returns the value type
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///
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/// - A scalar value, such as `i32`, `bool`
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/// - Borrowing of scalar values, such as `&i32`, `&bool`
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/// - Vec<T>, such as `Vec<i32>`
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/// - Slice<T>, such as `&[i32]`
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/// - Option<T>, such as `Option<i32>`
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/// - Object and &Object
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/// - Enum
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/// - FieldResult<T, E>, such as `FieldResult<i32, E>`
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///
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/// # Context
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///
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/// You can define a context as an argument to a method, and the context should be the first argument to the method.
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///
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/// ```ignore
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/// #[Object]
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/// impl QueryRoot {
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/// async fn value(&self, ctx: &Context<'_>) -> { ... }
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/// }
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/// ```
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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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/// value: i32,
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/// }
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///
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/// #[Object]
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/// impl QueryRoot {
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/// #[field(desc = "value")]
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/// async fn value(&self) -> i32 {
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/// self.value
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/// }
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///
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/// #[field(desc = "reference value")]
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/// async fn value_ref(&self) -> &i32 {
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/// &self.value
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/// }
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///
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/// #[field(desc = "value with error")]
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/// async fn value_with_error(&self) -> FieldResult<i32> {
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/// Ok(self.value)
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/// }
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///
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/// async fn value_with_arg(&self, #[arg(default = "1")] a: i32) -> i32 {
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/// a
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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{ value: 10 }, EmptyMutation, EmptySubscription);
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/// let res = schema.execute(r#"{
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/// value
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/// valueRef
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/// valueWithError
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/// valueWithArg1: valueWithArg
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/// valueWithArg2: valueWithArg(a: 99)
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/// }"#).await.unwrap().data;
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/// assert_eq!(res, serde_json::json!({
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/// "value": 10,
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/// "valueRef": 10,
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/// "valueWithError": 10,
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/// "valueWithArg1": 1,
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/// "valueWithArg2": 99
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/// }));
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/// }
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/// ```
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pub use async_graphql_derive::Object;
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/// Define a GraphQL object
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///
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/// Similar to `Object`, but defined on a structure that automatically generates getters for all fields.
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///
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/// # Macro parameters
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///
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/// | Attribute | description | Type | Optional |
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/// |---------------|---------------------------|----------|----------|
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/// | name | Object name | string | Y |
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/// | desc | Object description | string | Y |
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/// | cache_control | Object cache control | [`CacheControl`](struct.CacheControl.html) | Y |
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///
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/// # Field parameters
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///
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/// | Attribute | description | Type | Optional |
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/// |---------------|---------------------------|----------|----------|
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/// | name | Field name | string | Y |
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/// | desc | Field description | string | Y |
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/// | deprecation | Field deprecation reason | string | Y |
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/// | cache_control | Field cache control | [`CacheControl`](struct.CacheControl.html) | Y |
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/// | external | Mark a field as owned by another service. This allows service A to use fields from service B while also knowing at runtime the types of that field. | bool | Y |
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/// | provides | Annotate the expected returned fieldset from a field on a base type that is guaranteed to be selectable by the gateway. | string | Y |
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/// | requires | Annotate the required input fieldset from a base type for a resolver. It is used to develop a query plan where the required fields may not be needed by the client, but the service may need additional information from other services. | string | Y |
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/// | guard | Field of guard | [`Guard`](guard/trait.Guard.html) | Y |
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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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/// #[SimpleObject]
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/// struct QueryRoot {
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/// value: i32,
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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{ value: 10 }, EmptyMutation, EmptySubscription);
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/// let res = schema.execute("{ value }").await.unwrap().data;
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/// assert_eq!(res, serde_json::json!({
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/// "value": 10,
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/// }));
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/// }
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/// ```
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pub use async_graphql_derive::SimpleObject;
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/// Define a GraphQL enum
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///
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/// # Macro parameters
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///
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/// | Attribute | description | Type | Optional |
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/// |-------------|---------------------------|----------|----------|
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/// | name | Enum name | string | Y |
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/// | desc | Enum description | string | Y |
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///
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/// # Item parameters
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///
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/// | Attribute | description | Type | Optional |
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/// |-------------|---------------------------|----------|----------|
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/// | name | Item name | string | Y |
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/// | desc | Item description | string | Y |
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/// | deprecation | Item deprecation reason | string | Y |
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/// | ref | The resolver function returns a borrowing value | bool | Y |
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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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/// #[Enum]
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/// enum MyEnum {
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/// A,
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/// #[item(name = "b")] B,
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/// }
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///
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/// struct QueryRoot {
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/// value1: MyEnum,
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/// value2: MyEnum,
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/// }
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///
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/// #[Object]
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/// impl QueryRoot {
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/// #[field(desc = "value")]
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/// async fn value1(&self) -> MyEnum {
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/// self.value1
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/// }
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///
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/// #[field(desc = "value")]
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/// async fn value2(&self) -> MyEnum {
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/// self.value2
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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{ value1: MyEnum::A, value2: MyEnum::B }, EmptyMutation, EmptySubscription);
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/// let res = schema.execute("{ value1 value2 }").await.unwrap().data;
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/// assert_eq!(res, serde_json::json!({ "value1": "A", "value2": "b" }));
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/// }
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/// ```
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pub use async_graphql_derive::Enum;
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/// Define a GraphQL input object
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///
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/// # Macro parameters
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///
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/// | Attribute | description | Type | Optional |
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/// |-------------|---------------------------|----------|----------|
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/// | name | Object name | string | Y |
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/// | desc | Object description | string | Y |
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///
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/// # Field parameters
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///
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/// | Attribute | description | Type | Optional |
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/// |-------------|---------------------------|----------|----------|
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/// | name | Field name | string | Y |
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/// | desc | Field description | string | Y |
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/// | default | Field default value | string | Y |
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/// | validator | Input value validator | [`InputValueValidator`](validators/trait.InputValueValidator.html) | Y |
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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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/// #[InputObject]
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/// struct MyInputObject {
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/// a: i32,
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/// #[field(default = "10")]
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/// b: i32,
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/// }
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///
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/// struct QueryRoot;
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///
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/// #[Object]
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/// impl QueryRoot {
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/// #[field(desc = "value")]
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/// async fn value(&self, input: MyInputObject) -> i32 {
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/// input.a * input.b
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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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/// let res = schema.execute(r#"
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/// {
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/// value1: value(input:{a:9, b:3})
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/// value2: value(input:{a:9})
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/// }"#).await.unwrap().data;
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/// assert_eq!(res, serde_json::json!({ "value1": 27, "value2": 90 }));
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/// }
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/// ```
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pub use async_graphql_derive::InputObject;
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/// Define a GraphQL interface
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///
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/// # Macro parameters
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///
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/// | Attribute | description | Type | Optional |
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/// |-------------|---------------------------|----------|----------|
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/// | name | Object name | string | Y |
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/// | desc | Object description | string | Y |
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///
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/// # Field parameters
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///
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/// | Attribute | description | Type | Optional |
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/// |-------------|---------------------------|----------|----------|
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/// | name | Field name | string | N |
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/// | type | Field type | string | N |
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/// | desc | Field description | string | Y |
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/// | deprecation | Field deprecation reason | string | Y |
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/// | args | Field arguments | | Y |
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///
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/// # Field argument parameters
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///
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/// | Attribute | description | Type | Optional |
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/// |-------------|---------------------------|----------|----------|
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/// | name | Argument name | string | N |
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/// | type | Argument type | string | N |
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/// | desc | Argument description | string | Y |
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/// | default | Argument default value | string | Y |
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///
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/// # Define an interface
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///
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/// Define TypeA, TypeB, TypeC... Implement the MyInterface
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///
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/// ```ignore
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/// #[Interface]
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/// enum MyInterface {
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/// TypeA(TypeA),
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/// TypeB(TypeB),
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/// TypeC(TypeC),
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/// ...
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/// }
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/// ```
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///
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/// # Fields
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///
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/// The type, name, and parameter fields of the interface must exactly match the type of the
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/// implementation interface, but FieldResult can be omitted.
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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 TypeA {
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/// value: i32,
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/// }
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///
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/// #[Object]
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/// impl TypeA {
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/// /// Returns data borrowed from the context
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/// async fn value_a<'a>(&self, ctx: &'a Context<'_>) -> &'a str {
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/// ctx.data::<String>().as_str()
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/// }
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///
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/// /// Returns data borrowed self
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/// async fn value_b(&self) -> &i32 {
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/// &self.value
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/// }
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///
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/// /// With parameters
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/// async fn value_c(&self, a: i32, b: i32) -> i32 {
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/// a + b
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/// }
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/// }
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///
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/// #[Interface(
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/// field(name = "value_a", type = "&'ctx str"),
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/// field(name = "value_b", type = "&i32"),
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/// field(name = "value_c", type = "i32",
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/// arg(name = "a", type = "i32"),
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/// arg(name = "b", type = "i32")),
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/// )]
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/// enum MyInterface {
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/// TypeA(TypeA)
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/// }
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///
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|
/// struct QueryRoot;
|
|
///
|
|
/// #[Object]
|
|
/// impl QueryRoot {
|
|
/// async fn type_a(&self) -> MyInterface {
|
|
/// TypeA { value: 10 }.into()
|
|
/// }
|
|
/// }
|
|
///
|
|
/// #[async_std::main]
|
|
/// async fn main() {
|
|
/// let schema = Schema::build(QueryRoot, EmptyMutation, EmptySubscription).data("hello".to_string()).finish();
|
|
/// let res = schema.execute(r#"
|
|
/// {
|
|
/// typeA {
|
|
/// valueA
|
|
/// valueB
|
|
/// valueC(a: 3, b: 2)
|
|
/// }
|
|
/// }"#).await.unwrap().data;
|
|
/// assert_eq!(res, serde_json::json!({
|
|
/// "typeA": {
|
|
/// "valueA": "hello",
|
|
/// "valueB": 10,
|
|
/// "valueC": 5
|
|
/// }
|
|
/// }));
|
|
/// }
|
|
/// ```
|
|
pub use async_graphql_derive::Interface;
|
|
|
|
/// Define a GraphQL union
|
|
///
|
|
///
|
|
/// # Macro parameters
|
|
///
|
|
/// | Attribute | description | Type | Optional |
|
|
/// |-------------|---------------------------|----------|----------|
|
|
/// | name | Object name | string | Y |
|
|
/// | desc | Object description | string | Y |
|
|
///
|
|
/// # Define a union
|
|
///
|
|
/// Define TypeA, TypeB, ... as MyUnion
|
|
///
|
|
/// ```rust
|
|
/// use async_graphql::*;
|
|
///
|
|
/// #[SimpleObject]
|
|
/// struct TypeA {
|
|
/// value_a: i32,
|
|
/// }
|
|
///
|
|
/// #[SimpleObject]
|
|
/// struct TypeB {
|
|
/// value_b: i32
|
|
/// }
|
|
///
|
|
/// #[Union]
|
|
/// enum MyUnion {
|
|
/// TypeA(TypeA),
|
|
/// TypeB(TypeB),
|
|
/// }
|
|
///
|
|
/// struct QueryRoot;
|
|
///
|
|
/// #[Object]
|
|
/// impl QueryRoot {
|
|
/// async fn all_data(&self) -> Vec<MyUnion> {
|
|
/// vec![TypeA { value_a: 10 }.into(), TypeB { value_b: 20 }.into()]
|
|
/// }
|
|
/// }
|
|
///
|
|
/// #[async_std::main]
|
|
/// async fn main() {
|
|
/// let schema = Schema::build(QueryRoot, EmptyMutation, EmptySubscription).data("hello".to_string()).finish();
|
|
/// let res = schema.execute(r#"
|
|
/// {
|
|
/// allData {
|
|
/// ... on TypeA {
|
|
/// valueA
|
|
/// }
|
|
/// ... on TypeB {
|
|
/// valueB
|
|
/// }
|
|
/// }
|
|
/// }"#).await.unwrap().data;
|
|
/// assert_eq!(res, serde_json::json!({
|
|
/// "allData": [
|
|
/// { "valueA": 10 },
|
|
/// { "valueB": 20 },
|
|
/// ]
|
|
/// }));
|
|
/// }
|
|
/// ```
|
|
pub use async_graphql_derive::Union;
|
|
|
|
/// Define a GraphQL subscription
|
|
///
|
|
/// The field function is a synchronization function that performs filtering. When true is returned, the message is pushed to the client.
|
|
/// The second parameter is the type of the field.
|
|
/// Starting with the third parameter is one or more filtering conditions, The filter condition is the parameter of the field.
|
|
/// The filter function should be synchronous.
|
|
///
|
|
/// # Macro parameters
|
|
///
|
|
/// | Attribute | description | Type | Optional |
|
|
/// |-------------|---------------------------|----------|----------|
|
|
/// | name | Object name | string | Y |
|
|
/// | desc | Object description | string | Y |
|
|
///
|
|
/// # Field parameters
|
|
///
|
|
/// | Attribute | description | Type | Optional |
|
|
/// |-------------|---------------------------|----------|----------|
|
|
/// | name | Field name | string | Y |
|
|
/// | desc | Field description | string | Y |
|
|
/// | deprecation | Field deprecation reason | string | Y |
|
|
/// | guard | Field of guard | [`Guard`](guard/trait.Guard.html) | Y |
|
|
///
|
|
/// # Field argument parameters
|
|
///
|
|
/// | Attribute | description | Type | Optional |
|
|
/// |-------------|---------------------------|----------|----------|
|
|
/// | name | Argument name | string | Y |
|
|
/// | desc | Argument description | string | Y |
|
|
/// | default | Argument default value | string | Y |
|
|
/// | validator | Input value validator | [`InputValueValidator`](validators/trait.InputValueValidator.html) | Y |
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```ignore
|
|
/// use async_graphql::*;
|
|
///
|
|
/// #[Object]
|
|
/// struct Event {
|
|
/// value: i32,
|
|
/// }
|
|
///
|
|
/// struct SubscriptionRoot;
|
|
///
|
|
/// #[Subscription]
|
|
/// impl SubscriptionRoot {
|
|
/// async fn value(&self, event: &Event, condition: i32) -> bool {
|
|
/// // Push when value is greater than condition
|
|
/// event.value > condition
|
|
/// }
|
|
/// }
|
|
/// ```
|
|
pub use async_graphql_derive::Subscription;
|
|
|
|
/// Define a DataSource
|
|
pub use async_graphql_derive::DataSource;
|
|
|
|
/// Define a Scalar
|
|
pub use async_graphql_derive::Scalar;
|