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, tide, 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: 1.75.0 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
• Tide async-graphql-tide
• 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) and GraphQL Playground (playground):

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 avaliable.

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

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.

lib.rs:

Async-graphql integration with Rocket.

Note: This integrates with the unreleased version 0.5 of Rocket, and so breaking changes in both this library and Rocket are to be expected.

To configure options for sending and receiving multipart requests, add your instance of MultipartOptions to the state managed by Rocket (.manage(your_multipart_options)).

Full Example