async-graphql

a high-performance graphql server library that's fully specification compliant

Book • 中文文档 • Docs • GitHub repository • Cargo package

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This crate uses #![forbid(unsafe_code)] to ensure everything is implemented in 100% safe Rust.

Static schema

use std::error::Error;

use async_graphql::{http::GraphiQLSource, EmptyMutation, EmptySubscription, Object, Schema};
use async_graphql_poem::*;
use poem::{listener::TcpListener, web::Html, *};

struct Query;

#[Object]
impl Query {
    async fn howdy(&self) -> &'static str {
        "partner"
    }
}

#[handler]
async fn graphiql() -> impl IntoResponse {
    Html(GraphiQLSource::build().finish())
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    // create the schema
    let schema = Schema::build(Query, EmptyMutation, EmptySubscription).finish();

    // start the http server
    let app = Route::new().at("/", get(graphiql).post(GraphQL::new(schema)));
    println!("GraphiQL: http://localhost:8000");
    Server::new(TcpListener::bind("0.0.0.0:8000"))
        .run(app)
        .await?;
    Ok(())
}

Dynamic schema

Requires the dynamic-schema feature to be enabled.

use std::error::Error;

use async_graphql::{dynamic::*, http::GraphiQLSource};
use async_graphql_poem::*;
use poem::{listener::TcpListener, web::Html, *};

#[handler]
async fn graphiql() -> impl IntoResponse {
    Html(GraphiQLSource::build().finish())
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    let query = Object::new("Query").field(Field::new(
        "howdy",
        TypeRef::named_nn(TypeRef::STRING),
        |_| FieldFuture::new(async { "partner" }),
    ));

    // create the schema
    let schema = Schema::build(query, None, None).register(query).finish()?;

    // start the http server
    let app = Route::new().at("/", get(graphiql).post(GraphQL::new(schema)));
    println!("GraphiQL: http://localhost:8000");
    Server::new(TcpListener::bind("0.0.0.0:8000"))
        .run(app)
        .await?;
    Ok(())
}

⚠️Security

I strongly recommend limiting the complexity and depth of queries in a production environment to avoid possible DDos attacks.

• SchemaBuilder.limit_complexity
• SchemaBuilder.limit_depth
• SchemaBuilder.limit_directives

Features

• Static and dynamic schemas are fully supported
• Fully supports async/await
• Type safety
• Rustfmt friendly (Procedural Macro)
• Custom scalars
• Minimal overhead
• Easy integration (poem, axum, actix-web, warp, rocket ...)
• Upload files (Multipart request)
• Subscriptions (WebSocket transport)
• Custom extensions
• Error extensions
• Limit query complexity/depth
• Batch queries
• Apollo Persisted Queries
• Apollo Tracing extension
• Apollo Federation(v2)

Note: Minimum supported Rust version: 1.86.0 or later

Examples

All examples are in the sub-repository, located in the examples directory.

git submodule update # update the examples repo
cd examples && cargo run --bin [name]

For more information, see the sub-repository README.md.

Integrations

Integrations are what glue async-graphql with your web server, here are provided ones, or you can build your own!

• Poem async-graphql-poem
• Actix-web async-graphql-actix-web
• Warp async-graphql-warp
• Rocket async-graphql-rocket
• Axum async-graphql-axum

Crate features

This crate offers the following features. Most are not activated by default, except the integrations of GraphiQL (graphiql):

feature	enables
apollo_tracing	Enable the Apollo tracing extension.
apollo_persisted_queries	Enable the Apollo persisted queries extension.
boxed-trait	Enables async-trait for all traits.
chrono	Integrate with the chrono crate.
chrono-tz	Integrate with the chrono-tz crate.
dataloader	Support DataLoader.
decimal	Integrate with the rust_decimal crate.
dynamic-schema	Support dynamic schema
graphiql	Enables the GraphiQL IDE integration
log	Enable the Logger extension.
rawvalue	Support raw values from serde_json
secrecy	Integrate with the secrecy crate.
string_number	Enable the StringNumber.
time	Integrate with the time crate.
tracing	Enable the Tracing extension.
tempfile	Save the uploaded content in the temporary file.
unblock	Support Asynchronous reader for Upload
uuid	Integrate with the uuid crate.
url	Integrate with the url crate.

Extra Extensions

Additional extensions are available in the async-graphql-extras crate. These extensions require additional dependencies and are maintained separately.

See the extras crate README for more information.

Observability

One of the tools used to monitor your graphql server in production is Apollo Studio. Apollo Studio is a cloud platform that helps you build, monitor, validate, and secure your organization's data graph. Add the extension crate async_graphql_apollo_studio_extension to make this available.

Who's using async-graphql in production?

• Vector
• DiveDB
• Kairos Sports tech
• AxieInfinity
• Nando's
• Prima.it
• VoxJar
• Zenly
• Brevz
• thorndyke
• My Data My Consent

Community Showcase

• rust-actix-graphql-sqlx-postgresql Using GraphQL with Rust and Apollo Federation
• entity-rs A simplistic framework based on TAO, Facebook's distributed database for Social Graph.
• vimwiki-server Provides graphql server to inspect and manipulate vimwiki files.
• Diana Diana is a GraphQL system for Rust that's designed to work as simply as possible out of the box, without sacrificing configuration ability.
• cindythink
• sudograph
• grpc_graphql_gateway is an open-source protoc plugin that generates GraphQL execution server code from your gRPC/Protocol Buffers definitions.

Blog Posts

• Async GraphQL with Rust
• GraphQL in Rust
• How to implement a Rust micro-service using Rocket, GraphQL, PostgreSQL
• Running GraphQL on Lambda with Rust

References

• GraphQL
• GraphQL Multipart Request
• Multipart HTTP protocol for GraphQL subscriptions
• GraphQL Cursor Connections Specification
• GraphQL over WebSocket Protocol
• Apollo Tracing
• Apollo Federation

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT) at your option.