async-graphql

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

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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(())
}

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: 1.70.0 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]

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):

feature	enables
apollo_tracing	Enable the Apollo tracing extension.
apollo_persisted_queries	Enable the Apollo persisted queries extension.
log	Enable the Logger extension.
tracing	Enable the Tracing extension.
opentelemetry	Enable the OpenTelemetry extension.
unblock	Support Asynchronous reader for Upload
bson	Integrate with the bson crate.
chrono	Integrate with the chrono crate.
chrono-tz	Integrate with the chrono-tz crate.
url	Integrate with the url crate.
uuid	Integrate with the uuid crate.
uuid08	Integrate with the uuid 0.8 crate.
string_number	Enable the StringNumber.
dataloader	Support DataLoader.
secrecy	Integrate with the secrecy crate.
decimal	Integrate with the rust_decimal crate.
bigdecimal	Integrate with the bigdecimal crate.
cbor	Support for serde_cbor.
smol_str	Integrate with the smol_str crate.
hashbrown	Integrate with the hashbrown crate.
time	Integrate with the time crate.
tokio-sync	Integrate with the tokio::sync::RwLock and tokio::sync::Mutex.
fast_chemail	Integrate with the fast_chemail crate.
tempfile	Save the uploaded content in the temporary file.
dynamic-schema	Support dynamic schema
graphiql	Enables the GraphiQL IDE integration
playground	Enables the GraphQL playground IDE integration

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.